@article {https://doi.org/10.1002/pc.27068, title = {New insight into natural fiber-reinforced polymer composites as pressure sensors: Experiment, theory, and application}, journal = {Polymer Composites}, volume = {n/a}, number = {n/a}, year = {Submitted}, abstract = {Abstract Research in hybrid and flexible natural fiber-reinforced polymer composites has included advances in innovative and environmentally sustainable devices. However, in practice, controversies still exist regarding the relationship between electrical and materials performance targets in a system design context. This work aimed to investigate the alternating conductivity of a novel pressure sensor based on semiconducting polyaniline (PANI)-coated vegetable fiber (VF, Euterpe oleracea Mart., Acai) in silicone polydimethylsiloxane (PDMS) rubber. We used alternating electrical conductivity measurements, σ*(ω) ∝ ωs (frequency range{\textemdash}ω from 1 Hz to 10~MHz; s ~ 0.6), to adjust the optimal operating frequency region to enhance the pressure sensing performance of the PDMS-PANI-VF composites. A generalized effective-medium approach to the pressure-induced conductivity in terms of loading pressure, percolation regime, and the interpolation between Bruggeman{\textquoteright}s symmetric and asymmetric media theories was obtained. We have found a solution for inducing percolation in composites with a low concentration of fiber inclusions by uniaxial pressure (P), characterized by the expression σ ∝ (P-P0)t (0 <= t <= 4.0, 0 <= P0 <= 250 kPa). The sensor demonstrates maximum sensitivity of 1.5~Pa-1 in the operating electrical frequency from 1 to 100 Hz, and a wide linearity range from 0 to 250 kPa. The result provides new insight into the AC universality, s, and t behaviors of natural fiber-reinforced polymer composites to enhance pressure sensitivity of a new concept and technology for resource-efficiency optimization of sustainable environmental devices.}, keywords = {AC universality, flexible device, flexible electronics, sustainable materials}, doi = {https://doi.org/10.1002/pc.27068}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/pc.27068}, author = {Costa, Cleidineia Cavalcante and Ludmila Marotta Mapa and Kelmer, Ana Carolina and Ferreira, Sukarno Olavo and Rodrigo Fernando Bianchi} } @article {omwoyo2023black, title = {Black hole lensing in Kerr-de Sitter spacetimes}, journal = {The European Physical Journal Plus}, volume = {138}, number = {11}, year = {2023}, pages = {1043}, publisher = {Springer}, author = {Omwoyo, Eunice and Belich, Humberto and Fabris, J{\'u}lio C and Velten, Hermano} } @article {10.1063/5.0160203, title = {B2N2O2: A wide-bandgap two-dimensional semiconductor featuring a zigzag nitrogen array of bonds}, journal = {Applied Physics Letters}, volume = {123}, number = {9}, year = {2023}, month = {08}, pages = {093103}, abstract = {In this work, we apply a combination of theoretical techniques to characterize a two-dimensional material with formula B2N2O2, featuring a zigzag array of nitrogen atoms. We predict its energetic, thermal, and dynamic stability and determine its electronic properties, including band structure and mobility evaluation for a phonon-mediated mechanism. We show that the compound is a wideband-gap semiconductor, with parabolic band edges and with large electron and hole mobilities within the deformation potential approach. We ascribe this result to the existence of electronic channels defined by the zigzag array of nitrogen bonds, which define the edges of both conduction and valence bands. We also propose a mechanism to synthesize the compound based on oxygen functionalization and application of pressure. Finally, we show that the results can be generalized to represent a family of 2D compounds.}, issn = {0003-6951}, doi = {10.1063/5.0160203}, url = {https://doi.org/10.1063/5.0160203}, author = {Valentim, Mirela R. and Matos, Matheus J. S. and Mazzoni, Mario S. C.} } @article {flecha2023social, title = {Social Network Analysis in disaster management}, journal = {Production}, volume = {33}, year = {2023}, pages = {e20220046}, publisher = {SciELO Brasil}, author = {Flecha, Angela Cabral and Bandeira, Renata Albergaria and Campos, Vania Barcellos Gouv{\^e}a and Silva, Alcides Volpato Castro and Leiras, Adriana} } @article {sym15071392, title = {Using Cosmological Perturbation Theory to Distinguish between GR and Unimodular Gravity}, journal = {Symmetry}, volume = {15}, number = {7}, year = {2023}, abstract = {Unimodular gravity is one of the oldest geometric gravity theories and alternatives to general relativity. Essentially, it is based on the Einstein\–Hilbert Lagrangian with an additional constraint on the determinant of the metric. It can be explicitly shown that unimodular gravity can be recast as general relativity in the presence of a cosmological constant. This fact has led to many discussions on the equivalence of both theories at the classical and quantum levels. Here, we present an analysis focused on the classical scalar perturbations around a cosmological background. We focus on the unusual situation in which the typical conservation laws are not adopted. The discussion is extended to the case where a non-minimal coupled scalar field is introduced. We also present a gauge-invariant analysis showing that perturbations in unimodular gravity display instabilities. Our results reinforce that the equivalence is not verified completely at a cosmological perturbative level.}, issn = {2073-8994}, doi = {10.3390/sym15071392}, url = {https://www.mdpi.com/2073-8994/15/7/1392}, author = {J{\'u}lio C. Fabris and Alvarenga, Marcelo H. and Velten, Hermano} } @article {PimentaMartins2023, title = {Pressure tuning of minibands in MoS2/WSe2 heterostructures revealed by moir{\'e} phonons}, journal = {Nature Nanotechnology}, year = {2023}, month = {Jun}, abstract = {Moir{\'e} superlattices of two-dimensional heterostructures arose as a new platform to investigate emergent behaviour in quantum solids with unprecedented tunability. To glean insights into the physics of these systems, it is paramount to discover new probes of the moir{\'e} potential and moir{\'e} minibands, as well as their dependence on external tuning parameters. Hydrostatic pressure is a powerful control parameter, since it allows to continuously and reversibly enhance the moir{\'e} potential. Here we use high pressure to tune the minibands in a rotationally aligned MoS2/WSe2 moir{\'e} heterostructure, and show that their evolution can be probed via moir{\'e} phonons. The latter are Raman-inactive phonons from the individual layers that are activated by the moir{\'e} potential. Moir{\'e} phonons manifest themselves as satellite Raman peaks arising exclusively from the heterostructure region, increasing in intensity and frequency under applied pressure. Further theoretical analysis reveals that their scattering rate is directly connected to the moir{\'e} potential strength. By comparing the experimental and calculated pressure-induced enhancement, we obtain numerical estimates for the moir{\'e} potential amplitude and its pressure dependence. The present work establishes moir{\'e} phonons as a sensitive probe of the moir{\'e} potential as well as the electronic structures of moir{\'e} systems.}, issn = {1748-3395}, doi = {10.1038/s41565-023-01413-3}, url = {https://doi.org/10.1038/s41565-023-01413-3}, author = {Luiz G. Pimenta Martins and Ruiz-Tijerina, David A. and Occhialini, Connor A. and Park, Ji-Hoon and Song, Qian and Ang-Yu Lu and Pedro Venezuela and Luiz G. Can{\c c}ado and Mazzoni, M{\'a}rio S. C. and Matos, Matheus J. S. and Kong, Jing and Riccardo Comin} } @article {10.1371/journal.pone.0285630, title = {On the fractal patterns of language structures}, journal = {PLOS ONE}, volume = {18}, number = {5}, year = {2023}, month = {05}, pages = {1-20}, publisher = {Public Library of Science}, abstract = {Natural Language Processing (NLP) makes use of Artificial Intelligence algorithms to extract meaningful information from unstructured texts, i.e., content that lacks metadata and cannot easily be indexed or mapped onto standard database fields. It has several applications, from sentiment analysis and text summary to automatic language translation. In this work, we use NLP to figure out similar structural linguistic patterns among several different languages. We apply the word2vec algorithm that creates a vector representation for the words in a multidimensional space that maintains the meaning relationship between the words. From a large corpus we built this vectorial representation in a 100-dimensional space for English, Portuguese, German, Spanish, Russian, French, Chinese, Japanese, Korean, Italian, Arabic, Hebrew, Basque, Dutch, Swedish, Finnish, and Estonian. Then, we calculated the fractal dimensions of the structure that represents each language. The structures are multi-fractals with two different dimensions that we use, in addition to the token-dictionary size rate of the languages, to represent the languages in a three-dimensional space. Finally, analyzing the distance among languages in this space, we conclude that the closeness there is tendentially related to the distance in the Phylogenetic tree that depicts the lines of evolutionary descent of the languages from a common ancestor.}, doi = {10.1371/journal.pone.0285630}, url = {https://doi.org/10.1371/journal.pone.0285630}, author = {Leonardo Costa Ribeiro and Am{\'e}rico Trist{\~a}o Bernardes and Mello, Heliana} } @article {doi:10.1080/02678292.2023.2202160, title = {Unlocking the potential of 2,1,3-benzoxadiazole-based luminescent liquid crystals}, journal = {Liquid Crystals}, year = {2023}, pages = {1-11}, publisher = {Taylor \& Francis}, doi = {10.1080/02678292.2023.2202160}, url = {https://doi.org/10.1080/02678292.2023.2202160}, author = {Fabr{\'\i}cia Nunes da Silva and Eliane Oliveira Silva and Gerson dos Santos and Bruna B. Postacchini and Cazati, Thiago and Bechtold, Ivan H. and Andr{\'e} Alexandre Vieira} } @article {araujo2023presentation, title = {PRESENTATION OF CONCEPTS IN A CHILDREN{\textquoteright}S SCIENCE COMMUNICATION BOOK: THE CASE OF {\textquotedblleft}ISAAC NO MUNDO DAS PART{\'I}CULAS{\textquotedblright}}, journal = {Ensaio Pesquisa em Educa{\c c}{\~a}o em Ci{\^e}ncias (Belo Horizonte)}, volume = {25}, year = {2023}, pages = {e39775}, publisher = {SciELO Brasil}, author = {Araujo, Jo{\~a}o Felipe Viana de and Lima, Guilherme da Silva and Almeida, Sheila Alves de} } @article {NUNESMARINHO2023, title = {Nanostructured system based on hydroxyapatite and curcumin: A promising candidate for osteosarcoma therapy}, journal = {Ceramics International}, year = {2023}, abstract = {Osteosarcoma is the most common type of bone cancer. Despite therapeutic progress, survival rates for metastatic cases or that do not respond well to chemotherapy remain in the 30\% range. In this sense, the use of nanotechnology to develop targeted and more effective therapies is a promising tool in the fight against cancer. Nanostructured hydroxyapatite, due to its biocompatibility and the wide possibility of functionalization, is an interesting material to design nanoplatforms for targeted drug delivery. These platforms have the potential to enable the use of natural substances in the fight against cancer, such as curcumin. Curcumin is a polyphenol with promising properties in treating various types of cancer, including osteosarcoma. In this work, hydroxyapatite (n-HA) nanorods synthesized by the hydrothermal method were investigated as a carrier for curcumin. For this, first-principle calculations based on the Density Functional Theory (DFT) were performed, in which the modification of curcumin (CM) with the coupling agent (3-aminopropyl) triethoxysilane (APTES) was theoretically evaluated. Curcumin was incorporated in n-HA and the drug loading stability was evaluated by leaching test. Samples were characterized by a multi-techniques approach, including Fourier transform infrared spectroscopy (FTIR), UV{\textendash}visible spectroscopy (UV{\textendash}Vis), X-ray diffraction (XRD), X-ray fluorescence spectrometry (FRX), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), zeta potential analysis (ζ), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The results show that n-HAs with a 90 nm average size were obtained and successful incorporation of curcumin in the nanostructure was achieved. Cell viability and the number of osteosarcoma cells were decreased by CMAP-HA treatment. Furthermore, the stability test suggests that hydroxyapatite nanoparticles present great potential for the transportation of curcumin in the bloodstream, crediting this system for biological performance evaluations aiming at the treatment of osteosarcomas. Keywords: nanostructures, curcumin, hydroxyapatite, osteosarcoma.}, keywords = {Curcumin, Hydroxyapatite, Nanostructures, Osteosarcoma}, issn = {0272-8842}, doi = {https://doi.org/10.1016/j.ceramint.2023.03.115}, url = {https://www.sciencedirect.com/science/article/pii/S0272884223006995}, author = {J{\'e}ssica Pauline Nunes Marinho and Natalia Paz Neme and Matheus Josue de Souza Matos and Ronaldo Junio Campos Batista and Waldemar Augusto de Almeida Macedo and Pedro Lana Gastelois and Dawidson Assis Gomes and Michele Angela Rodrigues and Marcelo Fernandes Cipreste and Ed{\'e}sia Martins Barros Sousa} } @article {doi:10.1063/5.0123283, title = {High-pressure studies of atomically thin van der Waals materials}, journal = {Applied Physics Reviews}, volume = {10}, number = {1}, year = {2023}, pages = {011313}, doi = {10.1063/5.0123283}, url = {https://doi.org/10.1063/5.0123283}, author = {Luiz G. Pimenta Martins and Riccardo Comin and Matos, Matheus J. S. and Mazzoni, M{\'a}rio S. C. and Neves, Bernardo R. A. and Yankowitz,Matthew} } @book {29701, title = {TRANSFORMA{\c C}{\~O}ES DE FASES EM MATERIAIS}, year = {2023}, pages = {626}, address = {Ouro Preto}, url = {https://drive.google.com/file/d/1-p-XyYYyAlzvNujj2Xw_Yhpdo8rv80kU/view?usp=drive_web}, author = {Andr{\'e} Barros Cota} } @article {sousa2023liquid, title = {Liquid phase exfoliation of talc: effect of the medium on flake size and shape}, journal = {Beilstein Journal of Nanotechnology}, volume = {14}, number = {1}, year = {2023}, pages = {68{\textendash}78}, publisher = {Beilstein-Institut}, author = {Sousa, Samuel M and Morais, Helane LO and Joyce C C Santos and Ana Paula M Barboza and Bernardo R A Neves and Pinto, Elis{\^a}ngela S and Prado, Mariana C} } @article {leocadio2023growth, title = {Growth and structural characterization of Tutton salt mixed of Co and Ni}, journal = {REM-International Engineering Journal}, volume = {76}, year = {2023}, pages = {55{\textendash}62}, publisher = {SciELO Brasil}, author = {Leoc{\'a}dio, Rodolfo Rocha Vieira and Perp{\'e}tuo, Genivaldo J{\'u}lio and Franco, Carlos Joel and Batista, Adriano Corr{\^e}a} } @article {Amarante2022, title = {Carbon nanotube-cellulose ink for rapid liquid identification}, journal = {Beilstein Archives}, year = {2022}, doi = {10.3762/bxiv.2022.90.v1}, author = {Tiago Amarante and Cunha, Thiago H. R. and Claudio Laudares and Barboza, Ana P. M. and Ana Carolina dos Santos and Cintia L. Pereira and Vinicius Ornelas and Neves, Bernardo R. A. and Ferlauto, Andre S. and Lacerda, Rodrigo G.} } @article {doi:10.1021/acs.jpcc.2c03608, title = {Charge and Spin Current Rectification through Functionalized Boron Nitride Bilayers}, journal = {The Journal of Physical Chemistry C}, year = {2022}, pages = {null}, doi = {10.1021/acs.jpcc.2c03608}, url = {https://doi.org/10.1021/acs.jpcc.2c03608}, author = {Moraes, Elizane E. de and Alysson A. Pinto and Batista, Ronaldo J. C. and de Oliveira, Alan B. and Chacham, Helio} } @article {10.1088/1361-6382/ac9ae5, title = {Constraining GUP models using limits on SME coefficients}, journal = {Classical and Quantum Gravity}, year = {2022}, abstract = {Generalized uncertainty principles (GUP) and, independently, Lorentz symmetry violations are two common features in many candidate theories of quantum gravity. Despite that, the overlap between both has received limited attention so far. In this brief paper, we carry out further investigations on this topic. At the nonrelativistic level and in the realm of commutative spacetime coordinates, a large class of both isotropic and anisotropic GUP models is shown to produce signals experimentally indistinguishable from those predicted by the Standard Model Extension (SME), the common framework for studying Lorentz-violating phenomena beyond the Standard Model. This identification is used to constrain GUP models using current limits on SME coefficients. In particular, bounds on isotropic GUP models are improved by a factor of $10^7$ compared to current spectroscopic bounds and anisotropic models are constrained for the first time.}, url = {http://iopscience.iop.org/article/10.1088/1361-6382/ac9ae5}, author = {Herkenhoff Gomes, Andr{\'e}} } @article {doi:10.1080/02678292.2022.2122088, title = {Rod-shaped cyanoacrylic derivatives with D-π-A architecture: synthesis, thermal, photophysical and theoretical studies}, journal = {Liquid Crystals}, year = {2022}, pages = {1-11}, publisher = {Taylor \& Francis}, doi = {10.1080/02678292.2022.2122088}, url = {https://doi.org/10.1080/02678292.2022.2122088}, author = {Caroline S. B. Weber and Aline Tavares and Bruno Bercini de Ara{\'u}jo and Rebeca O. Costa and Manhabosco, Taise M. and Bruna B. Postacchini and Vieira, Andr{\'e} A. and Cazati, Thiago and Aloir A. Merlo} } @article {PINTO2022111737, title = {BCN diamondol-like compounds: Stability trends and electronic properties}, journal = {Computational Materials Science}, volume = {215}, year = {2022}, pages = {111737}, abstract = {In this work we apply first principles calculations to investigate the stability trends of mixed boron, nitrogen and carbon diamondol-like compounds. Several distinct geometric models are tested by varying the stoichiometry and position of boron and nitrogen dopants. We verify the special stability of a complete boron nitride compound {\textendash} the bonitrol {\textendash}, and we show that carbon substitutions in the bonitrol structure may also lead to stable systems. The electronic characterization of the resulting compounds indicates a rich phenomenology, with metallic, semimetallic, half-metallic and semiconducting behaviors.}, keywords = {2D materials, BCN compounds, Diamane, Diamondol, Nanostructures}, issn = {0927-0256}, doi = {https://doi.org/10.1016/j.commatsci.2022.111737}, url = {https://www.sciencedirect.com/science/article/pii/S0927025622004566}, author = {A.K.M. Pinto and J.M. Pontes and Matos, Matheus J. S. and Mazzoni, Mario S. C. and Azevedo, S.} } @article {GOMES_GUIMAR{\~A}ES_CRUZ_2022, title = {A FORMA{\c C}{\~A}O CONTINUADA DE PROFESSORES EM TEMPOS DA PANDEMIA DO COVID-19: CONTRIBUI{\c C}{\~O}ES DA NEUROCI{\^E}NCIA APLICADA {\`A} EDUCA{\c C}{\~A}O}, journal = {Forma{\c c}{\~a}o Docente {\textendash} Revista Brasileira de Pesquisa sobre Forma{\c c}{\~a}o de Professores}, volume = {14}, number = {30}, year = {2022}, month = {ago.}, pages = {197{\textendash}210}, doi = {10.31639/rbpfp.v14i30.564}, url = {https://revformacaodocente.com.br/index.php/rbpfp/article/view/564}, author = {GOMES, Larissa Layane and Guimar{\~a}es, Michele Hidemi Ueno and CRUZ, Luciana Hoffert Castro} } @article {PhysRevB.106.115301, title = {Investigation of spatially localized defects in synthetic $\mathrmWS_2$ monolayers}, journal = {Phys. Rev. B}, volume = {106}, year = {2022}, month = {Sep}, pages = {115301}, publisher = {American Physical Society}, doi = {10.1103/PhysRevB.106.115301}, url = {https://link.aps.org/doi/10.1103/PhysRevB.106.115301}, author = {Rosa, B{\'a}rbara L. T. and Kazunori Fujisawa and Joyce C. C. Santos and Tianyi Zhang and Matos, Matheus J. S. and Sousa, Frederico B. and Tiago C. Barbosa and Lucas Lafeta and Ramos, S{\'e}rgio L. L. M. and Bruno R. Carvalho and Chacham, Helio and Neves, Bernardo R. A. and Mauricio Terrones and Malard, Leandro M.} } @article {Velten_Delladea_Primola_2022, title = {Um crit{\'e}rio energ{\'e}tico para o desenvolvimento de vida em um exoplaneta}, journal = {Cadernos de Astronomia}, volume = {3}, number = {2}, year = {2022}, month = {ago.}, pages = {59{\textendash}65}, doi = {10.47456/Cad.Astro.v3n2.38561}, url = {https://periodicos.ufes.br/astronomia/article/view/38561}, author = {Velten, Hermano and Delladea, Douglas and Primola, Arthur} } @article {universe8080429, title = {Brans\–Dicke Unimodular Gravity}, journal = {Universe}, volume = {8}, number = {8}, year = {2022}, abstract = {We propose a unimodular version of the Brans\–Dicke theory designed with a constrained Lagrangian formulation. The resulting field equations are traceless. The vacuum solutions in the cosmological background reproduce the corresponding solutions of the usual Brans\–Dicke theory but with a cosmological constant term. A perturbative analysis of the scalar modes is performed and stable and unstable configurations appear, in contrast with the Brans\–Dicke case for which only stable configurations occur. On the other hand, tensorial modes in this theory remain the same as in the traditional Brans\–Dicke theory.}, issn = {2218-1997}, doi = {10.3390/universe8080429}, url = {https://www.mdpi.com/2218-1997/8/8/429}, author = {Almeida, Alexandre M. R. and J{\'u}lio C. Fabris and Daouda, Mahamadou Hamani and Kerner, Richard and Velten, Hermano and Hip{\'o}lito-Ricaldi, Willian S.} } @article {figueiredo2022immobilization, title = {Immobilization of Anthocyanin in Polymeric Film to Obtain a Colorimetric Sensor for Detection of Copper in Cacha{\c c}a}, journal = {Food Analytical Methods}, year = {2022}, pages = {1{\textendash}19}, publisher = {Springer}, author = {Figueiredo, Matheus Torres Duarte and Ferreira, Gabriel Max Dias and Lopez, Melany Alejandra Ruiz and das Gra{\c c}as Cardoso, Maria and de Oliveira, Juliano Elvis and Rodrigo Fernando Bianchi and Ferreira, Guilherme Max Dias and Mageste, Aparecida Barbosa} } @article {da2022conhecimento, title = {CONHECIMENTO DOS ADOLESCENTES COM RELA\cC{\~A}O {\`A}S INFEC\cC{\~O}ES SEXUALMENTE TRANSMISS{\'I}VEIS}, journal = {Revista Brasileira Interdisciplinar de Sa{\'u}de}, year = {2022}, author = {da Silva Lima, Guilherme and de Souza, Luccas Vin{\'{\i}cio and Farias, Maryana Rodrigues and Caldeira, Angelita Giovana and de Andrade Aoyama, Elis{\^a}ngela} } @article {silva2022characterization, title = {Characterization of Magnetic Tailings from Phosphate-Ore Processing in Alto Parana{\'{\i}ba}, journal = {Materials Research}, volume = {25}, year = {2022}, publisher = {SciELO Brasil}, author = {Silva, Fernando Brand{\~a}o Rodrigues da and Ara{\'u}jo, Fernando Gabriel Silva and von Kr{\"u}ger, Fernando Leopoldo and Guilherme Jorge Brigolini Silva and Ronaldo Junio Campos Batista and Manhabosco, Ta{\'{\i}se Matte} } @article {doi:10.1021/acsaelm.2c00432, title = {Delayed Fluorescence by Triplet\–Triplet Annihilation from Columnar Liquid Crystal Films}, journal = {ACS Applied Electronic Materials}, year = {2022}, pages = {null}, doi = {10.1021/acsaelm.2c00432}, url = {https://doi.org/10.1021/acsaelm.2c00432}, author = {Franca, Larissa G. and dos Santos, Paloma L. and Pander, Piotr and Cabral, Mar{\'\i}lia G. B. and Cristiano, Rodrigo and Cazati, Thiago and Monkman, Andrew P. and Bock, Harald and Eccher, Juliana} } @article {Fabris2022, title = {Nonconservative unimodular gravity: a viable cosmological scenario?}, journal = {The European Physical Journal C}, volume = {82}, number = {6}, year = {2022}, month = {Jun}, pages = {522}, abstract = {In this work we review the issue of imposing the conservation of the energy{\textendash}momentum tensor as a necessary condition to recover the equivalence between the unimodular gravity and General Relativity (GR) equipped with a cosmological constant. This procedure is usually interpreted as an ad hoc imposition on the unimodular theory{\textquoteright}s structure. Whereas the consequences of avoiding the conservation of the total energy{\textendash}momentum tensor has been already introduced in the literature, it has been not widely explored so far. We study an expanding universe sourced by a single effective perfect fluid such that the null divergence of its energy{\textendash}momentum tensor is not imposed. As we shall show, in this scheme, the unimodular theory has its own conservation equation obtained from the Bianchi identities. We explore the evolution of the homogeneous and isotropic expanding background and show that a viable cosmological scenario exists. Also, we consider scalar perturbations with particular attention given to the gauge issue. We show that contrary to the traditional unimodular theory where the synchronous and longitudinal (newtonian) gauge for cosmological perturbations are not permitted, if the conservation of the energy{\textendash}momentum is relaxed the scalar perturbations in the synchronous condition survive and present a growing mode behavior. We study therefore a new cosmological scenario in which the dynamics of the universe transits from the radiative phase directly to a accelerated one but allowing thus for structure formation.}, issn = {1434-6052}, doi = {10.1140/epjc/s10052-022-10470-2}, url = {https://doi.org/10.1140/epjc/s10052-022-10470-2}, author = {J{\'u}lio C. Fabris and Alvarenga, Marcelo H. and Hamani-Daouda, Mahamadou and Velten, Hermano} } @article {BATISTA2022128589, title = {Improved bioceramic coatings reinforced by nanostructured talc}, journal = {Surface and Coatings Technology}, volume = {441}, year = {2022}, pages = {128589}, abstract = {Nano-talc was successfully incorporated in the hydroxyapatite matrix via pulsed electrodeposition after being obtained using an eco-friendly liquid-phase exfoliation process. Scanning electron microscopy, atomic force microscopy, X-ray spectroscopy, Raman spectroscopy, corrosion and wear resistance, and cytocompatibility tests were used to characterize the biocomposite ceramics. Talc significantly improves the nanomechanical and wear properties of bioceramics (i.e., higher stiffness, reduced friction coefficient, and lower wear damage) as well as corrosion resistance. Talc does not induce cytotoxic activity in in vitro cells and may induce bone maturation as per biocompatibility tests.}, keywords = {Biocompatibility, Hydroxyapatite, Mechanical properties, Pulsed electrodeposition, Soapstone nano-talc}, issn = {0257-8972}, doi = {https://doi.org/10.1016/j.surfcoat.2022.128589}, url = {https://www.sciencedirect.com/science/article/pii/S0257897222005102}, author = {Ana Barbara Batista and Michael Stanley and de Brito, Ana Carolina Ferreira and Rebecca Vasconcellos and Munk, Michele and M{\'a}rio Jos{\'e}-Bueno and Cristina Godoy and {\'E}rika Costa de Alvarenga and Cl{\'a}udia Karina Barbosa de Vasconcelos and Ariete Righi and Ed{\'e}sia M.B. de Sousa and de Oliveira, Alan Barros and Ronaldo Junio Campos Batista and Jaqueline dos Santos Soares and Almeida Neves, Bernardo Ruegger and Ana Paula Moreira Barbosa and Ta{\'\i}se Matte Manhabosco} } @article {PhysRevD.105.103521, title = {Skewness as a test of dark energy perturbations}, journal = {Phys. Rev. D}, volume = {105}, year = {2022}, month = {May}, pages = {103521}, publisher = {American Physical Society}, doi = {10.1103/PhysRevD.105.103521}, url = {https://link.aps.org/doi/10.1103/PhysRevD.105.103521}, author = {Fazolo, Raquel Emy and Amendola, Luca and Velten, Hermano} } @article {doi:10.1021/acsnano.2c01065, title = {Electronic Band Tuning and Multivalley Raman Scattering in Monolayer Transition Metal Dichalcogenides at High Pressures}, journal = {ACS Nano}, year = {2022}, note = {PMID: 35466673}, pages = {null}, doi = {10.1021/acsnano.2c01065}, url = {https://doi.org/10.1021/acsnano.2c01065}, author = {Luiz G. Pimenta Martins and Bruno R. Carvalho and Occhialini, Connor A. and Neme, Nat{\'a}lia P. and Park, Ji-Hoon and Song, Qian and Pedro Venezuela and Mazzoni, M{\'a}rio S. C. and Matos, Matheus J. S. and Kong, Jing and Riccardo Comin} } @article {gomes2022deformations, title = {Deformations of the canonical commutation relation and Lorentz symmetry violation}, journal = {arXiv preprint arXiv:2205.02044}, year = {2022}, author = {Gomes, Andr{\'e} H} } @article {omwoyo2022remarks, title = {Remarks on the black hole shadows in Kerr-de Sitter space times}, journal = {The European Physical Journal C}, volume = {82}, number = {5}, year = {2022}, pages = {1{\textendash}17}, publisher = {Springer}, author = {Omwoyo, Eunice and Belich, Humberto and Fabris, J{\'u}lio C and Velten, Hermano} } @article {guimaraes2022analise, title = {UMA AN{\'A}LISE CR{\'I}TICA SOBRE A IMPLEMENTA\cC{\~A}O DO SCALE-UP NO INSTITUTO DE F{\'I}SICA DA UNIVERSIDADE DE S{\~A}O PAULO}, journal = {Experi{\^e}ncias em Ensino de Ci{\^e}ncias}, volume = {17}, number = {1}, year = {2022}, pages = {57{\textendash}75}, author = {Guimar{\~a}es, Michele Hidemi Ueno and Muramatsu, Mikiya and Passos, Marinez Meneghello} } @article {Lima_Guimar{\~a}es_Passos_2022, title = {Astronomical phenomena: a teaching proposal}, journal = {Research, Society and Development}, volume = {11}, number = {6}, year = {2022}, month = {Apr.}, pages = {e15211629011}, doi = {10.33448/rsd-v11i6.29011}, url = {https://rsdjournal.org/index.php/rsd/article/view/29011}, author = {Lima, Filipe Paix{\~a}o de and Guimar{\~a}es, Michele Hidemi Ueno and Passos, Marinez Meneghello} } @article {ferrari2022graphene, title = {Graphene nanoencapsulation action at an air/lipid interface}, journal = {Journal of Materials Science}, year = {2022}, pages = {1{\textendash}10}, publisher = {Springer}, author = {Ferrari, Gustavo A and Chacham, Helio and Alan B de Oliveira and Matheus J S Matos and Ronaldo J C Batista and Meireles, Leonel M and Ana Paula M Barboza and Silvestre, Ive and Bernardo R A Neves and Rodrigo G Lacerda} } @article {doi:10.1021/acsomega.1c06525, title = {Aerosol-Printed MoS2 Ink as a High Sensitivity Humidity Sensor}, journal = {ACS Omega}, year = {2022}, pages = {null}, doi = {10.1021/acsomega.1c06525}, url = {https://doi.org/10.1021/acsomega.1c06525}, author = {Pereira, Neuma M. and Rezende, Nat{\'a}lia P. and Cunha, Thiago H. R. and Barboza, Ana P. M. and Silva, Glaura G. and Lippross, Daniel and Neves, Bernardo R. A. and Chacham, H{\'e}lio and Ferlauto, Andre S. and Lacerda, Rodrigo G.} } @article {vaccines10030343, title = {Successive Pandemic Waves with Different Virulent Strains and the Effects of Vaccination for SARS-CoV-2}, journal = {Vaccines}, volume = {10}, number = {3}, year = {2022}, abstract = {One hundred years after the flu pandemic of 1918, the world faces an outbreak of a new severe acute respiratory syndrome, caused by a novel coronavirus. With a high transmissibility, the pandemic has spread worldwide, creating a scenario of devastation in many countries. By the middle of 2021, about 3\% of the world population had been infected and more than 4 million people had died. Different from the H1N1 pandemic, which had a deadly wave and ceased, the new disease is maintained by successive waves, mainly produced by new virus variants and the small number of vaccinated people. In the present work, we create a version of the SIR model using the spatial localization of persons, their movements, and considering social isolation probabilities. We discuss the effects of virus variants, and the role of vaccination rate in the pandemic dynamics. We show that, unless a global vaccination is implemented, we will have continuous waves of infections.}, issn = {2076-393X}, doi = {10.3390/vaccines10030343}, url = {https://www.mdpi.com/2076-393X/10/3/343}, author = {Castro e Silva, Alcides and Am{\'e}rico Trist{\~a}o Bernardes and Barbosa, Eduardo Augusto Gon{\c c}alves and Chagas, Igor Aparecido Santana das and D{\'a}ttilo, Wesley and Reis, Alexandre Barbosa and Ribeiro, S{\'e}rvio Pontes} } @article {GONCALVES2022114627, title = {Optical properties of boron nitride nanoribbons with reconstruted edges}, journal = {Solid State Communications}, year = {2022}, pages = {114627}, abstract = {In this work, we employ first-principles calculations to investigate the optical properties of boron nitride nanoribbons with reconstructed edges. We found that because of the presence of homopolar B-B and N-N bonds in the edges, such nanoribbons, unlike boron nitride nanotubes, absorb light and have non-null optical conductivity in the visible and infrared range. The stoichiometry and distribution of the homopolar bonds in the edges change the absorption, reflectance, refraction index, and optical conductivity of nanoribbons, which may allow the tuning of those properties. Regarding the absorption in the infrared and visible range, the nanoribbons with B excess are almost unaffected by the direction of light incidence. On the other hand, the direction of light incidence strongly affects the intensity of the absorption peaks of nanoribbons with N excess in the region. At ultraviolet and above non-cylindrical geometry of the ribbons with the homopolar bonds at the edges also lead to a dependence of the optical properties with the direction of light incidence.}, keywords = {Boron nitride nanosheets, Optical properties, Reconstructions edges}, issn = {0038-1098}, doi = {https://doi.org/10.1016/j.ssc.2021.114627}, url = {https://www.sciencedirect.com/science/article/pii/S0038109821004051}, author = {Gon{\c c}alves, Juliana A. and Osmar F.P. dos Santos and Batista, Ronaldo J. C. and S{\'e}rgio Azevedo} } @article {GONCALVES2022139266, title = {First-principle investigation of silicon carbide nanosheets fluorination: Stability trends, electronic, optical and magnetic properties}, journal = {Chemical Physics Letters}, volume = {787}, year = {2022}, pages = {139266}, abstract = {We employed first-principles calculations to investigate the fluorination of silicon carbide nanosheets. We found that the Si atoms are the energetically favorable adsorption sites for F atoms in silicon carbide nanosheets in all studied cases. The strain caused by the fourfold coordinated Si atoms in the flat SiC nanosheet determines the relative position of the adsorbed F atoms: occupying nearest-neighbor Si sites if they bound sheet{\textquoteright}s opposing sides or away from each other if they are on the same side of the sheet. The fluorinated nanosheets{\textquoteright} electronic and magnetic properties are weakly dependent on which side of the sheet the F atoms bind; however, they are strongly dependent on the relative distance between them. For F atoms adsorbed on nearest-neighbor Si sites, the system is a small gap p-type semiconductor with 1 μB per adsorbed atom. On the other hand, if F atoms do not occupy nearest-neighbor Si sites, the system is a metal with 1/2 μB per adsorbed atom. The adsorption of F atoms strongly affects the optical properties of SiC sheets inducing optical anisotropy regarding the direction of the incidence of light.}, keywords = {DFT, Nanomaterials, Nanosheets, Silicon Carbide(SiC)}, issn = {0009-2614}, doi = {https://doi.org/10.1016/j.cplett.2021.139266}, url = {https://www.sciencedirect.com/science/article/pii/S0009261421009490}, author = {Gon{\c c}alves, Juliana A. and Osmar F.P. dos Santos and Batista, Ronaldo J. C. and S{\'e}rgio Azevedo} } @article {lima2021interaccoes, title = {Intera{\c c}{\~o}es Discursivas entre Educadores Museais e Estudantes: Um Estudo de Caso em um Museu de Ci{\^e}ncias a partir das Contribui{\c c}{\~o}es de Bakhtin e do C{\'{\i}rculo}, journal = {Revista Brasileira de Pesquisa em Educa{\c c}{\~a}o em Ci{\^e}ncias}, year = {2021}, pages = {e21788{\textendash}33}, author = {Lima, Guilherme and Rocha, Jessica Norberto} } @article {fernandes2021representaccoes, title = {As Representa{\c c}{\~o}es de Stephen Hawking em Filmes Biogr{\'a}ficos}, journal = {Revista Brasileira de Pesquisa em Educa{\c c}{\~a}o em Ci{\^e}ncias}, year = {2021}, pages = {e16539{\textendash}32}, author = {Fernandes, Jo{\~a}o and Lima, Guilherme and Aguiar Jr, Orlando Gomes} } @article {da2021ciencia, title = {CI{\^E}NCIA, ARTE E FILOSOFIA: MOBILIZANDO DISCURSOS NO USO EDUCATIVO DO CINEMA NUMA ATIVIDADE N{\~A}O FORMAL}, journal = {Investiga{\c c}{\~o}es em Ensino de Ci{\^e}ncias}, volume = {26}, number = {1}, year = {2021}, pages = {305{\textendash}323}, publisher = {Universidade Federal do Rio Grande do Sul, Instituto de F{\'{\i}sica}, author = {da Silva Lima, Guilherme and Pagliarini, Cassiano Rezende and Aguiar Jr, Orlando Gomes} } @article {da2021mensagens, title = {Mensagens falsas sobre o novo coronav{\'{\i}rus: legitimidade e manipula{\c c}{\~a}o na luta de classes}, journal = {Chasqui: Revista Latinoamericana de Comunicaci{\'o}n}, number = {147}, year = {2021}, pages = {259{\textendash}279}, publisher = {Centro Internacional de Estudios Superiores de Comunicaci{\'o}n para Am{\'e}rica~{\textellipsis}}, author = {da Silva Lima, Guilherme and Calazans, Marcos Moraes and Massi, Luciana} } @article {lima2021reformulaccao, title = {Da reformula{\c c}{\~a}o discursiva a uma pr{\'a}xis da cultura cient{\'{\i}fica: reflex{\~o}es sobre a divulga{\c c}{\~a}o cient{\'{\i}fica}, journal = {Hist{\'o}ria, Ci{\^e}ncias, Sa{\'u}de-Manguinhos}, volume = {28}, year = {2021}, pages = {375{\textendash}392}, publisher = {SciELO Brasil}, author = {Lima, Guilherme da Silva and Giordan, Marcelo} } @article {physics3040071, title = {Stellar Structure in a Newtonian Theory with Variable G}, journal = {Physics}, volume = {3}, number = {4}, year = {2021}, pages = {1123{\textendash}1132}, abstract = {A Newtonian-like theory inspired by the Brans\–Dicke gravitational Lagrangian has been recently proposed by us. For static configurations, the gravitational coupling acquires an intrinsic spatial dependence within the matter distribution. Therefore, the interior of astrophysical configurations may provide a testable environment for this approach as long as no screening mechanism is evoked. In this work, we focus on the stellar hydrostatic equilibrium structure in such a varying Newtonian gravitational coupling G scenario. A modified Lane\–Emden equation is presented and its solutions for various values of the polytropic index are discussed. The role played by the theory parameter \ω, the analogue of the Brans\–Dicke parameter, in the physical properties of stars is discussed.}, issn = {2624-8174}, doi = {10.3390/physics3040071}, url = {https://www.mdpi.com/2624-8174/3/4/71}, author = {J{\'u}lio C. Fabris and Ottoni, T{\'u}lio and J{\'u}nior D. Toniato and Velten, Hermano} } @article {doi:10.1021/acsanm.1c03002, title = {Electromechanical Modulations in Transition Metal Dichalcogenide Nanosheets: Implications for Environmental Sensors}, journal = {ACS Applied Nano Materials}, year = {2021}, pages = {null}, doi = {10.1021/acsanm.1c03002}, url = {https://doi.org/10.1021/acsanm.1c03002}, author = {Bessa, Mauricio V. and Freitas, Wellington D. and Neme, Nat{\'a}lia P. and Martins, Luiz G. P. and Barboza, Ana P. M. and Matos, Matheus J. S. and Mazzoni, Mario S. C. and Neves, Bernardo R. A.} } @article {silva2021sequencia, title = {Sequ{\^e}ncia Did{\'a}tica para o ensino de Astronomia}, journal = {Caderno Brasileiro de Ensino de F{\'{\i}sica}, volume = {38}, number = {2}, year = {2021}, pages = {1135{\textendash}1165}, author = {Silva, Victor Peres and Guimar{\~a}es, Michele Hidemi Ueno and Passos, Marinez Meneghello} } @article {Castro-e-Silva2021.09.21.21263901, title = {Successive pandemic waves with more virulent strains, and the effects of vaccination for SARS-CoV-2}, journal = {medRxiv}, year = {2021}, publisher = {Cold Spring Harbor Laboratory Press}, abstract = {Hundred years after the flu pandemic of 1918, the world faces an outbreak of a new severe acute respiratory syndrome, caused by a novel coronavirus. With a high transmissibility, the pandemic spreads worldwide, creating a scenario of devastation in many countries. By the middle of 2021, about 3\% of the world population has been infected and more than 4 million people have died. Different from the H1N1 pandemic, which had a deadly wave and cessed, the new disease is maintained by successive waves, mainly produced by new virus variants, and the small number of vaccinated people. In the present work, we create a version of the SIR model with spatial localization of persons, their movements, and taking into account social isolation probabilities. We discuss the effects of virus variants, and the role of vaccination rate in the pandemic dynamics. We show that, unless a global vaccination is implemented, we will have continuous waves of infections.HighlightsThe COVID-19 has infected more than 200 millions and has killed more than 4 million persons.WHO has not been successful in defining a global vaccination policy.Many epidemic scenarios arise when different countries apply different vaccination strategies.Present model can show some insights on how vaccination programs can be managed.Competing Interest StatementThe authors have declared no competing interest.Funding StatementThis research did not receive any specific grant from funding agencies in the commercial, or non-profit sectors. SPR acknowledges grant from Conselho Nacional de Desenvolvimento Cientifico e Tecnologico - CNPq, through proccess 306572/2019-2.Author DeclarationsI confirm all relevant ethical guidelines have been followed, and any necessary IRB and/or ethics committee approvals have been obtained.YesThe details of the IRB/oversight body that provided approval or exemption for the research described are given below:The manuscript is a modeling paper, there was no clinical trial of any kind.All necessary patient/participant consent has been obtained and the appropriate institutional forms have been archived.YesI understand that all clinical trials and any other prospective interventional studies must be registered with an ICMJE-approved registry, such as ClinicalTrials.gov. I confirm that any such study reported in the manuscript has been registered and the trial registration ID is provided (note: if posting a prospective study registered retrospectively, please provide a statement in the trial ID field explaining why the study was not registered in advance).YesI have followed all appropriate research reporting guidelines and uploaded the relevant EQUATOR Network research reporting checklist(s) and other pertinent material as supplementary files, if applicable.YesThe code of model is included in manuscript files.}, doi = {10.1101/2021.09.21.21263901}, url = {https://www.medrxiv.org/content/early/2021/09/24/2021.09.21.21263901}, author = {Castro-e-Silva, Alcides and Bernardes, Am{\'e}rico T and Gon\c calves Barbosa, Eduardo Augusto and D{\'a}ttilo, Wesley and S{\'E}RVIO P. RIBEIRO} } @article {PhysRevD.104.063507, title = {Early-time thermalization of cosmic components? A hint for solving cosmic tensions}, journal = {Phys. Rev. D}, volume = {104}, year = {2021}, month = {Sep}, pages = {063507}, publisher = {American Physical Society}, doi = {10.1103/PhysRevD.104.063507}, url = {https://link.aps.org/doi/10.1103/PhysRevD.104.063507}, author = {Velten, Hermano and Costa, Ingrid and Zimdahl, Winfried} } @article {D1RA05301A, title = {Interplay between structural deformations and flat band phenomenology in twisted bilayer antimonene}, journal = {RSC Adv.}, volume = {11}, year = {2021}, pages = {27855-27859}, publisher = {The Royal Society of Chemistry}, abstract = {In this work we apply first principles calculations to investigate the flat band phenomenology in twisted antimonene bilayer. We show that the relatively strong interlayer interactions which characterize this compound have profound effects in the emergence and properties of the flat bands. Specifically, when the moir{\'e} length becomes large enough to create well defined stacking patterns along the structure, out-of-plane displacements take place and are stabilized in the regions dominated by the AB stacking, leading to the emergence of flat bands. The interplay between structural and electronic properties allows for detection of flat bands in higher twist angles comparable to other two-dimensional materials. We also show that their energy position may be modulated by noncovalent functionalization with electron acceptor molecules.}, doi = {10.1039/D1RA05301A}, url = {http://dx.doi.org/10.1039/D1RA05301A}, author = {Alan C.R. Souza and Matos, Matheus J. S. and Mazzoni, Mario S. C.} } @article {2021, title = {From Spanish Flu to Syndemic COVID-19: long-standing sanitarian vulnerability of Manaus, warnings from the Brazilian rainforest gateway}, volume = {93}, number = {suppl 3}, year = {2021}, publisher = {FapUNIFESP (SciELO)}, doi = {10.1590/0001-3765202120210431}, url = {https://doi.org/10.1590\%2F0001-3765202120210431}, author = {S{\'E}RVIO P. RIBEIRO and ALEXANDRE B. REIS and D{\'a}ttilo, Wesley and ALCIDES V.C. DE CASTRO E SILVA and EDUARDO AUGUSTO G. BARBOSA and Coura-vital, Wendel and G{\'o}es-Neto, Arist{\'o}teles and VASCO A.C. AZEVEDO and Fernandes, Geraldo Wilson} } @article {PhysRevD.104.044020, title = {Post-Newtonian $\ensuremath\gamma$-like parameters and the gravitational slip in scalar-tensor and $f(R)$ theories}, journal = {Phys. Rev. D}, volume = {104}, year = {2021}, month = {Aug}, pages = {044020}, publisher = {American Physical Society}, doi = {10.1103/PhysRevD.104.044020}, url = {https://link.aps.org/doi/10.1103/PhysRevD.104.044020}, author = {J{\'u}nior D. Toniato and Rodrigues, Davi C.} } @article {NUNESNICOMEDES2021104618, title = {Comparison between hydroxyapatite/soapstone and hydroxyapatite/reduced graphene oxide composite coatings: Synthesis and property improvement}, journal = {Journal of the Mechanical Behavior of Biomedical Materials}, volume = {121}, year = {2021}, pages = {104618}, abstract = {Economic viability and eco-friendliness are important characteristics that make implants available to the population in a sustainable way. In this work, we evaluate the performance of a low-cost, widely available, and eco-friendly material (talc from soapstone) relative to reduced graphene oxide as reinforcement to brittle hydroxyapatite coatings. We employ a low-cost and straightforward technique, electrodeposition, to deposit the composite coatings on the titanium substrate. Corrosion, wear, and biocompatibility tests indicate that the reduced graphene oxide can be effectively replaced by talc without reducing the mechanical, anticorrosion, and biocompatible composite coatings properties. Our results indicate that talc from soapstone is a promising material for biomedical applications.}, keywords = {Biocompatibility, Hydroxyapatite, Pulsed electrodeposition, rGO, Soapstone talc}, issn = {1751-6161}, doi = {https://doi.org/10.1016/j.jmbbm.2021.104618}, url = {https://www.sciencedirect.com/science/article/pii/S175161612100299X}, author = {Daniel Nilson Nunes Nicomedes and Laureana Moreira Mota and Rebecca Vasconcellos and Nathanael Vieira Medrado and Michelle de Oliveira and {\'E}rika Costa de Alvarenga and Karyne R.C. Juste and Ariete Righi and Sara Matte Manhabosco and Guilherme Jorge Brigolini Silva and Fernando Gabriel S. Ara{\'u}jo and de Oliveira, Alan Barros and Ronaldo Junio Campos Batista and Jaqueline dos Santos Soares and Ta{\'\i}se Matte Manhabosco} } @article {doi:10.1063/5.0046430, title = {White LED phototherapy as an improved treatment for neonatal jaundice}, journal = {Review of Scientific Instruments}, volume = {92}, number = {6}, year = {2021}, pages = {064101}, doi = {10.1063/5.0046430}, url = {https://doi.org/10.1063/5.0046430}, author = {Savedra,R. M. L. and Fonseca,A. M. T. and Silva,M. M. and R.F. Bianchi and M.F. Siqueira} } @article {Antunes_2021, title = {In vitro Photoprotective Evaluation and Development of Novel Nanoemulsion with Chromone Derivative}, journal = {J. Braz. Chem. Soc.}, year = {2021}, publisher = {Sociedade Brasileira de Quimica (SBQ)}, doi = {10.21577/0103-5053.20210072}, url = {https://doi.org/10.21577\%2F0103-5053.20210072}, author = {Amanda Antunes and Ana Paula Gouveia and Gabriela Diogo and Taylor, Jason and Lucas Sousa and Tatiane Amparo and Fernanda Perasoli and Orlando dos Santos and Cazati, Thiago and Paula Vieira and Ricardo Penido and Viviane dos Santos} } @article {Santos_2021, title = {Topological vectors as a fingerprinting system for 2D-material flake distributions}, journal = {npj 2D Mater Appl}, volume = {5}, number = {1}, year = {2021}, month = {may}, publisher = {Springer Science and Business Media LLC}, doi = {10.1038/s41699-021-00234-z}, url = {https://doi.org/10.1038\%2Fs41699-021-00234-z}, author = {Joyce C. C. Santos and Prado, Mariana C. and Helane L. O. Morais and Samuel M. Sousa and Elisangela Silva-Pinto and Luiz G. Can{\c c}ado and Neves, Bernardo R. A.} } @article {SALES2021, title = {Structural, optical, and magnetic evaluation of Co-, Ni-, and Mn-modified multiferroic BiFeO3 ceramics}, journal = {Ceramics International}, year = {2021}, abstract = {Co-, Ni-, and Mn-doped BiFeO3 (BFO) ceramics were synthesized herein through a solid-state reaction. All doped BFO samples exhibit visible-light response, and the Co- and Ni-doped BFO samples present enhanced ferromagnetic order at room temperature. All doped samples show secondary phases in minor quantities. Optical spectra reveal two absorptions bands, indicating multiple electron transitions for BFO and its secondary phases. M~-~H hysteresis loops suggest enhanced ferromagnetism in the Co- and Ni-doped BFO samples because of magnetic spinel CFP and NFO phases, respectively, whereas changes in oxygen vacancies and Fe{\textendash}O{\textendash}Fe bond angle play minor roles in the ferromagnetic behavior.}, keywords = {A. powders: solid-state reaction, C. Magnetic properties, D. Ferrites}, issn = {0272-8842}, doi = {https://doi.org/10.1016/j.ceramint.2021.05.176}, url = {https://www.sciencedirect.com/science/article/pii/S0272884221015765}, author = {J.N.B. Sales and R.T. da Silva and L.R.S. Lara and S.L.L.M. Ramos and Soares, J. S. and T.A.S. Soares and G. Machado and Manhabosco, S. M. and de Oliveira, A. B. and H.B. de Carvalho and Batista, R. J. C. and H.O. Stumpf and T.M. Manhabosco} } @article {ALENCAR2021, title = {Fotografando com uma c{\~A}\textcentmera de pixel {\~A}\textordmasculinenico}, journal = {Revista Brasileira de Ensino de F{\~A}\-sica}, volume = {43}, year = {2021}, month = {00}, publisher = {scielo}, issn = {1806-1117}, url = {http://www.scielo.br/scielo.php?script=sci_arttext\&pid=S1806-11172021000100712\&nrm=iso}, author = {Alencar, Thonimar V. and Carvalho, Edson J.} } @article {Pogna_2021, title = {Angle-tunable intersubband photoabsorption and enhanced photobleaching in twisted bilayer graphene}, journal = {Nano Res.}, year = {2021}, month = {jan}, publisher = {Springer Science and Business Media LLC}, doi = {10.1007/s12274-021-3288-0}, url = {https://doi.org/10.1007\%2Fs12274-021-3288-0}, author = {Eva A. A. Pogna and Xianchong Miao and Driele von Dreifus and Alencar, Thonimar V. and Marcus V. O. Moutinho and Pedro Venezuela and Cristian Manzoni and Minbiao Ji and Giulio Cerullo and Ana Maria de Paula} } @article {BERNARDES2021125586, title = {Information, opinion and pandemic}, journal = {Physica A: Statistical Mechanics and its Applications}, volume = {565}, year = {2021}, pages = {125586}, abstract = {The world{\textquoteright}s population suffers a COVID-19 pandemic. By September 2020 nearly 1 million people had died. These are official numbers. The real cases might be much higher, due to under-reporting in many countries. Different strategies were adopted by national governments. Neglecting what was defined by sanitarian authorities, some politicians, at the beginning of the pandemic, declared that it would be a little flu, without consequences, lighter than seasonal flues. Some politicians propagated medicines with no scientific support. In many countries and regions, people became confused. The population{\textquoteright}s reactions to these political positions may facilitate or block the virus spread. In this paper, we propose a model connecting the spreading of opinions with the propagation of a pandemic. We discuss how conflicting opinions can diffuse in the pandemic environment and the influence it has on the population{\textquoteright}s behavior; how it may cause a greater or smaller number of infected individuals.}, keywords = {COVID-19, Opinion diffusion, Pandemic, SIR model, Sznajd model}, issn = {0378-4371}, doi = {https://doi.org/10.1016/j.physa.2020.125586}, url = {https://www.sciencedirect.com/science/article/pii/S0378437120308840}, author = {Am{\'e}rico T. Bernardes and Leonardo Costa Ribeiro} } @article {Gabriel_2021, title = {Mechanical Property Assessment of Interlocking Plastic Pavers Manufactured from Electronic Industry Waste in Brazil}, journal = {Recycling}, volume = {6}, number = {1}, year = {2021}, month = {feb}, pages = {15}, publisher = {MDPI AG}, doi = {10.3390/recycling6010015}, url = {https://doi.org/10.3390\%2Frecycling6010015}, author = {Luiz Tadeu Gabriel and Rodrigo Fernando Bianchi and Am{\'e}rico T. Bernardes} } @article {Sousa_2021, title = {Trypanocidal Activity and Increased Solubility of Benznidazole Incorporated in PEG 4000 and Its Derivatives}, journal = {J. Braz. Chem. Soc.}, year = {2021}, publisher = {Sociedade Brasileira de Quimica (SBQ)}, doi = {10.21577/0103-5053.20210017}, url = {https://doi.org/10.21577\%2F0103-5053.20210017}, author = {Lucas Sousa and Maria Lu\'{\i}za Azevedo and Dayana Rocha and {\^A}ngela Andrade and Tatiane Amparo and Orlando dos Santos and Jana\'{\i}na Seibert and Luciano Pereira and Paula Vieira and Cl{\'a}udia Carneiro and Ana Paula Barboza and Bernardo Neves and Policarpo Sales Jr. and Silvane Murta and K{\'a}tia Novack and Viviane dos Santos} } @article {Velten_2021, title = {Mat{\'e}ria escura e as estruturas c{\'o}smicas}, journal = {Cadernos de Astronomia}, volume = {2}, number = {1}, year = {2021}, month = {fev.}, pages = {58}, doi = {10.47456/Cad.Astro.v2n1.33609}, url = {https://www.periodicos.ufes.br/astronomia/article/view/33609}, author = {Velten, Hermano} } @article {Velten:2021xxw, title = {To conserve, or not to conserve: A review of nonconservative theories of gravity}, journal = {Universe}, volume = {7}, number = {2}, year = {2021}, pages = {38}, doi = {10.3390/universe7020038}, author = {Velten, Hermano and Caram{\^e}s, Thiago R. P.} } @article {Fabris_2021, title = {Newtonian-like gravity with variable G}, journal = {Eur. Phys. J. Plus}, volume = {136}, number = {2}, year = {2021}, month = {jan}, publisher = {Springer Science and Business Media LLC}, doi = {10.1140/epjp/s13360-021-01146-z}, url = {https://doi.org/10.1140\%2Fepjp\%2Fs13360-021-01146-z}, author = {J{\'u}lio C. Fabris and Tales Gomes and J{\'u}nior D. Toniato and Velten, Hermano} } @article {22005, title = {Estimate of underreporting of COVID-19 in Brazil by Acute Respiratory Syndrome hospitalization reports}, journal = {Notas T{\'e}cnicas Cedeplar-UFMG}, volume = {xx}, number = {xx}, year = {2020}, pages = {xx}, abstract = {The number of COVID-19 infected people in each country is a crucial factor to determine public policies. It guides the governments to strengthen movement restrictions of people or to relieve it. The number of infected people is very important to forecast the needs of the health systems, which are collapsing in many countries. Thus, underreporting of infected people is a huge problem, since authorities do not know the real problem and act in darkness. In the present work, we discuss this subject for the Brazilian case. We take the time series of acute respiratory syndromes reported in the health public system in the last ten years and estimated the number for March/20 when the COVID-19 appeared in Brazil. Our results show a 7.7:1 rate of underreporting, meaning that the real cases in Brazil should be, at least, seven times the publicized number.}, url = {https://ideas.repec.org/p/cdp/tecnot/tn010.html}, author = {Leonardo Costa Ribeiro and Am{\'e}rico Trist{\~a}o Bernardes} } @article {22001, title = {Os primeiros 80 dias da pandemia da COVID-19 em Belo Horizonte: da conten{\c c}{\~a}o {\`a} flexibiliza{\c c}{\~a}o}, journal = {Nova Economia}, volume = {30}, number = {0103-6351}, year = {2020}, pages = {701-737}, abstract = {Este artigo examina o contexto e as implica{\c c}{\~o}es da pandemia por Covid-19 na cidade de Belo Horizonte (BH) nos primeiros 80 dias da doen{\c c}a. Utilizamos um recorte anal{\'\i}tico descritivo para mensurar a evolu{\c c}{\~a}o dos casos, o excesso de {\'o}bitos, a taxa de transmissibilidade do v{\'\i}rus e a press{\~a}o da doen{\c c}a sobre o sistema de sa{\'u}de de BH e regi{\~a}o, atrav{\'e}s da taxa de ocupa{\c c}{\~a}o hospitalar nos leitos p{\'u}blicos. Al{\'e}m disso, identificamos as principais pol{\'\i}ticas de conten{\c c}{\~a}o adotadas pelas autoridades locais, bem como as implica{\c c}{\~o}es da redu{\c c}{\~a}o do distanciamento social. Nossos resultados demonstram que o Sistema {\'U}nico de Sa{\'u}de (SUS), bem gerido, {\'e} fundamental para o enfrentamento da pandemia e a mitiga{\c c}{\~a}o de suas consequ{\^e}ncias para a popula{\c c}{\~a}o. O processo de flexibiliza{\c c}{\~a}o que se inicia tem imposto novos desafios que requerer{\~a}o monitoramento atento das autoridades e da sociedade.}, url = {https://www.scielo.br/scielo.php?script=sci_arttext\&pid=S0103-63512020000200701\&nrm=iso}, author = {Andrade, Monica Viegas and Noronha, Kenya and Turra, Cassio Maldonado and Guedes, Gilvan and Cimini, Fernanda AND Ribeiro and Leonardo Costa and Bernardes, Americo Tristao and et. al.} } @article {10.1088/1361-648X/abd5f5, title = {Crystal reorientation and plastic deformation of single-layer MoS2 and MoSe2 under uniaxial stress}, journal = {Journal of Physics: Condensed Matter}, year = {2020}, abstract = {We investigate theoretically, through of first-principles calculations, the effect of the application of large in-plane uniaxial stress on single-layer of MoS2, MoSe2, and MoSSe alloys. For stress applied along the zigzag direction, we predict an anomalous behavior near the point fracture. This behavior is characterized by the reorientation of the MoS2 structure along the applied stress from zigzag to armchair due to the formation of transient square-lattice regions in the crystal, with an apparent (although not real) crystal rotation of 30 degrees. After reorientation, a large plastic deformation √3-1 remains after the stress is removed. This behavior is also observed in MoSe2 and in MoSSe alloys. This phenomenon is observed both in stress-constrained geometry optimizations and in ab initio molecular dynamics simulations at finite temperature and applied stress.}, url = {http://iopscience.iop.org/article/10.1088/1361-648X/abd5f5}, author = {Ananias B Alencar and Alan de Oliveira and Chacham, Helio} } @article {Velten_2020, title = {Post-Editorial of the Special Issue {\textquotedblleft}Estate Quantistica Conference{\textemdash}Recent Developments in Gravity, Cosmology, and Mathematical Physics{\textquotedblright}}, journal = {Universe}, volume = {6}, number = {12}, year = {2020}, month = {dec}, pages = {240}, publisher = {MDPI AG}, doi = {10.3390/universe6120240}, url = {https://doi.org/10.3390\%2Funiverse6120240}, author = {Velten, Hermano and Giuseppe Dito} } @article {DESANTOS2020114887, title = {Highly luminescent liquid crystals by connecting 1,3,4-oxadiazole with thiazolo[5,4-d]thiazole units}, journal = {Journal of Molecular Liquids}, year = {2020}, pages = {114887}, abstract = {The direct bonding between a thiazolo[5,4-d]thiazole and two 1,3,4-oxadiazole units allowed us to create a new and versatile rigid core for luminescent liquid crystal, which showed interesting and variable mesomorphic and photophysical properties. From the 5-bis(5-phenyl-1,3,4-oxadiazol-2-yl)thiazolo[5,4-d]thiazole new core, three molecules with different number of alkoxy chains were synthesized and had their properties correlated with the molecular structure. The molecule with two chains showed a smectic C mesophase, while the mesogens with four and six chains presented hexagonal columnar mesomorphism, which was confirmed by POM and XRD measurements. In addition, the molecule with six chains presented liquid crystalline behavior close to room temperature. In solution, the molecules presented strong photoluminescence ranging from blue to yellow, with quantum yields higher than 0.6. Excited state lifetimes allowed to correlate the fluorescence component associated to the different emitting species to the molecular organization in spin coated films. The molecular energy levels, together with thermal stability and possible charge carrier transport due to molecular packing, suggest that these molecules are promising for optoelectronic applications. Overall, this work contributes to the development of the use of thiazolo[5,4-d]thiazole in liquid crystals, demonstrating its great efficiency and versatility.}, keywords = {1, 3, 4-Oxadiazole, 4-]thiazole, Fluorescence, Liquid crystals, Polycatenar, Thiazolo[5}, issn = {0167-7322}, doi = {https://doi.org/10.1016/j.molliq.2020.114887}, url = {http://www.sciencedirect.com/science/article/pii/S0167732220371294}, author = {Arthur B.S. de Santos and Alex M. Manfredi and Salla, Cristian A. M. and Farias, Giliandro and Edivandro Girotto and Eccher, Juliana and Eduard Westphal and Curcio, Sergio F. and Cazati, Thiago and Ivani Malvestiti and Eduardo H.L. Falc{\~a}o and Bechtold, Ivan H. and Hugo Gallardo} } @article {Batista2020, title = {Nanomechanics of few-layer materials: do individual layers slide upon~folding?}, journal = {Beilstein J. Nanotechnol.}, volume = {11}, year = {2020}, pages = {1801{\textendash}1808}, doi = {doi:10.3762/bjnano.11.162}, author = {Batista, Ronaldo J. C. and Dias, Rafael F. and Barboza, Ana P. M. and de Oliveira, Alan B. and Manhabosco, Taise M. and Thiago R. Gomes-Silva and Andreij C. Gadellha and Cassiano Rabelo and Luiz G. L. Can{\c c}ado and Jorio, Ado and Chacham, H{\'e}lio and Neves, Bernardo R. A.} } @article {diniz2020electrical, title = {Electrical Impedance of V 2 O 5/POMA Hybrid Film Deposited by Casting for Application in Ammonia Gas Sensor}, journal = {Journal of Electronic Materials}, year = {2020}, pages = {1{\textendash}6}, publisher = {Springer}, author = {Diniz, MO and Coelho, RS and R F Bianchi and Guerra, EM} } @article {PIMENTAMARTINS2020, title = {Hard, transparent, sp3-containing 2D phase formed from few-layer graphene under compression}, journal = {Carbon}, year = {2020}, abstract = {Despite several theoretically proposed two-dimensional (2D) diamond structures, experimental efforts to obtain such structures are in initial stage. Recent high-pressure experiments provided significant advancements in the field, however, expected properties of a 2D-like diamond such as sp3 content, transparency and hardness, have not been observed together in a compressed graphene system. Here, we compress few-layer graphene samples on SiO2/Si substrate in water and provide experimental evidence for the formation of a quenchable hard, transparent, sp3-containing 2D phase. Our Raman spectroscopy data indicates phase transition and a surprisingly similar critical pressure for two-, five-layer graphene and graphite in the 4-6 GPa range, as evidenced by changes in several Raman features, combined with a lack of evidence of significant pressure gradients or local non-hydrostatic stress components of the pressure medium up to ≈ 8 GPa. The new phase is transparent and hard, as evidenced from indentation marks on the SiO2 substrate, a material considerably harder than graphene systems. Furthermore, we report the lowest critical pressure (≈ 4 GPa) in graphite, which we attribute to the role of water in facilitating the phase transition. Theoretical calculations and experimental data indicate a novel, surface-to-bulk phase transition mechanism that gives hint of diamondene formation.}, issn = {0008-6223}, doi = {https://doi.org/10.1016/j.carbon.2020.11.038}, url = {http://www.sciencedirect.com/science/article/pii/S0008622320311179}, author = {Luiz G. Pimenta Martins and Diego L. Silva and Jesse S. Smith and Ang-Yu Lu and Cong Su and Marek Hempel and Connor Occhialini and Xiang Ji and Ricardo Pablo and Rafael S. Alencar and Alan C.R. Souza and Alysson A. Pinto and de Oliveira, Alan B. and Batista, Ronaldo J. C. and Tom{\'a}s Palacios and Mazzoni, M{\'a}rio S. C. and Matos, Matheus J. S. and Riccardo Comin and Kong, Jing and Luiz G. Can{\c c}ado} } @article {D0TC03660A, title = {Reducing Lifetime in Cu(I) Complexes with Thermally Activated Delayed Fluorescence and Phosphorescence promoted by Chalcogenolate-Diimine Ligand}, journal = {J. Mater. Chem. C}, year = {2020}, pages = {-}, publisher = {The Royal Society of Chemistry}, abstract = {Luminescent copper(I) complexes have drawn attention due to their promising performance as alternative optoelectronic materials to the well-known heavy transition metals complexes. Herein, we report the synthesis of six luminescent Cu(I) complexes with phosphines and 1,10-phenanthroline-derived ligands with thiadiazole and selenodiazole groups in order to evaluate the effect of heavy atom on their photophysical properties. Steady-state and time-resolved spectroscopy confirmed delayed fluorescence emission via a thermally activated delayed fluorescence mechanism in all cases. The experimental spectroscopic data was analyzed with detailed quantum-chemical calculations. Interestingly, these complexes did not show the expected {\textquotedblleft}heavy atom effect{\textquotedblright}, that enhances the spin-orbit coupling matrix elements, but nevertheless the addition of the heavier chalcogens contributed to reduce the photoluminescence lifetime to roughly 800 ns, which is the lowest reported so far for such TADF materials.}, doi = {10.1039/D0TC03660A}, url = {http://dx.doi.org/10.1039/D0TC03660A}, author = {Farias, Giliandro and Salla, Cristian A. M. and da Silva Heying, Renata and Bortoluzzi, Adailton J and Curcio, Sergio and Cazati, Thiago and dos Santos, Paloma L. and Monkman, Andrew P and de Souza, Bernardo and BECHTOLD, IVAN H} } @article {DOSREISTEIXEIRA2020104970, title = {Association of electroanalytical and spectrophotometric methods to evaluate the antioxidant activity of isobenzofuranone in primary cultures of hippocampal neurons}, journal = {Toxicology in Vitro}, year = {2020}, pages = {104970}, abstract = {The isobenzofuran-1(3H)-ones (phthalides) exhibit various biological activities, including antioxidant activity on reactive oxygen species (ROS). An excess of ROS that cannot be naturally contained by cellular enzymatic systems is called redox imbalance, which damage cell membranes, proteins, and DNA, thereby possibly triggering neuronal death in several neurodegenerative diseases. Considering our ongoing efforts to find useful compounds to control redox imbalance, herein we evaluated the antioxidant activity of two phtalides (compounds 3 and 4), using primary cultures of hippocampal neurons. Spectrophotometric assays showed that compound 3 significantly reduced (p <= 0.05) ROS levels and lipid peroxidation compared to the control treatment, while compound 4 was unable at any of the tested concentrations. Despite their structural similarity, these compounds behave differently in the intracellular environment, which was reliably corroborated by the determination of oxidation potentials via cyclic voltammetry. It was demonstrated that compound 3 presents a lower oxidation potential. The combination of the mentioned methods allowed us to find a strong correlation between the chemical structure of compounds and their biological effects. Taking together, the results indicate that compound 3 presents desirable characteristics to act as a candidate pharmacological agent for use in the prevention and treatment of neurodegenerative diseases.}, keywords = {Antioxidants, Cyclic voltammetry, Free radicals, Hippocampal neurons, Isobenzofuranones, Spectrophotometric methods}, issn = {0887-2333}, doi = {https://doi.org/10.1016/j.tiv.2020.104970}, url = {http://www.sciencedirect.com/science/article/pii/S0887233320305208}, author = {Aniely dos Reis Teixeira and R{\'o}bson Ricardo Teixeira and Iara Mariana Lellis Ribeiro and Wagner Luiz Pereira and Taise Matte Manhabosco and de Brito, Ana Carolina Ferreira and Laser Ant{\^o}nio Machado Oliveira and Katiane de Oliveira and Pinto Coelho Nogueira} } @article {D0NJ03525D, title = {Synthesis, Photophysical and Electrochemical Properties of Novel and Highly Fluorescent Difluoroboron Flavanone β-Diketonate Complexes}, journal = {New J. Chem.}, year = {2020}, pages = {-}, publisher = {The Royal Society of Chemistry}, abstract = {Difluoroboron β-diketonates complexes are highly luminescent with extensive properties such as their fluorescence both in solution and in solid state and their high molar extinction coefficients. Due to their rich optical properties, these compounds have been studied for their applications in organic electronics such as in self-assembly and applications in biosensors, bio-imaging and optoelectronic devices. The easy and fast synthesis of difluoroboron β-diketonate (BF2dbm) complexes makes their applications even more attractive. Although many different types of difluoroboron β-diketonates complexes have been studied, the cyclic flavanone analogues of these compounds have never been reported in the literature. Therefore, the present work aims to synthesize difluouroboron flavanone β-diketonate complexes, study their photophysical and electrochemical properties and assess their suitability for applications in optoelectronic devices. The synthesis was based on a Baker{\textendash}Venkataraman reaction which initially provided substituted diketones, which were subsequently reacted with aldehydes to afford the proposed flavanones. The complexation was achieved by reacting flavanones and BF3. Et2O and in total 9 novel compounds were obtained. A representative difluoroboron flavanone complex was subjected to single crystal X-ray diffraction to unequivocally confirm the chemical structure. A stability study indicated only partial degradation of these compounds over a few days in a protic solvent at elevated temperatures. Photophysical studies revealed that the substituent groups and the solvent media significantly influence the electrochemical and photophysical properties of the final compounds, especially the molar absorption coefficient, fluorescence quantum yields, and the band gap. Moreover, the compounds exhibited a single excited-state lifetime in all studied solvent. Computational studies were employed to evaluate ground and excited states properties and carry out DFT and TDDFT level analysis. These studies clarify the role of each state in the experimental absorption spectra as well as the effect of the solvent.}, doi = {10.1039/D0NJ03525D}, url = {http://dx.doi.org/10.1039/D0NJ03525D}, author = {Paez, Elida Betania Ariza and Curcio, Sergio and Neme, Nat{\'a}lia and Matos, Matheus and Correa, Rodrigo S. and Pereira, Fabio Junio and Hil{\'a}rio, Flaviane Francisco and Cazati, Thiago and Taylor, Jason Guy} } @article {Velten_2020, title = {Mat{\'e}ria escura, energia escura e a busca por uma nova teoria para a gravita{\c c}{\~a}o}, journal = {Cadernos de Astronomia}, volume = {1}, number = {1}, year = {2020}, month = {jul.}, pages = {40-51}, doi = {10.47083/Cad.Astro.v1n1.31674}, url = {https://periodicos.ufes.br/astronomia/article/view/31674}, author = {Velten, Hermano} } @article {Pinheiro_Castro e Silva_Velten_2020, title = {Astrobiologia: como modelar o crescimento de organismos na Terra e em exoplanetas}, journal = {Cadernos de Astronomia}, volume = {1}, number = {1}, year = {2020}, month = {jul.}, pages = {116-122}, doi = {10.47083/Cad.Astro.v1n1.31097}, url = {https://periodicos.ufes.br/astronomia/article/view/31097}, author = {Pinheiro, Carlos Felipe Saraiva and Castro e Silva, Alcides and Velten, Hermano} } @article {NASCIMENTO2020, title = {Novel PEG 4000 derivatives and its use in controlled release of drug indomethacin}, journal = {Qu{\~A}\-mica Nova}, volume = {43}, year = {2020}, month = {06}, pages = {685 - 691}, publisher = {scielo}, issn = {0100-4042}, url = {http://www.scielo.br/scielo.php?script=sci_arttext\&pid=S0100-40422020000600685\&nrm=iso}, author = {Nascimento, L{\~A}\textordmasculinebia G. and Lopes, Suellen A. and Teodolino, Ayron B. L. and Novack, K{\~A}!{\textquoteleft}tia M. and Barboza, Ana Paula M. and Neves, Bernardo R. A. and Azevedo, Maria Luiza S. and Sousa, Lucas R. D. and M. R. dos Santos, Viviane} } @article {ZIMDAHL2020100681, title = {On (non-)dynamical dark energy}, journal = {Physics of the Dark Universe}, volume = {30}, year = {2020}, pages = {100681}, abstract = {The current Universe is composed by a mixture of relativistic species, baryonic matter, dark matter and dark energy which evolve in a non-trivial way at perturbative level. An advanced description of the cosmological dynamics should include non-standard features beyond the simplistic approach idealized by the standard cosmology in which cosmic components do not interact, are adiabatic and dissipationless. We promote a full perturbative analysis of linear scalar perturbations of a non-interacting cosmological model containing baryons, dark matter (both pressureless) and a scalar field allowing for the presence of relative entropic perturbations between the three fluids. Assuming an effective scalar-field sound speed equal to one and neglecting anisotropic stresses we establish a new set of equations for the scalar cosmological perturbations. As a consequence of this new approach, we show that tiny departures from a constant scalar field equation of state wS=-1 damage structure formation in a non-acceptable manner. Hence, by strongly constraining wS our results provide compelling evidence in favor of the standard cosmological model and rule out a large class of dynamical dark energy models.}, issn = {2212-6864}, doi = {https://doi.org/10.1016/j.dark.2020.100681}, url = {http://www.sciencedirect.com/science/article/pii/S2212686420303125}, author = {Zimdahl, Winfried and J{\'u}lio C. Fabris and Velten, Hermano and Ram{\'o}n Herrera} } @article {CIPRESTE2020123265, title = {A new theranostic system for bone disorders: Functionalized folate-MDP hydroxyapatite nanoparticles with radiolabeled copper-64}, journal = {Materials Chemistry and Physics}, year = {2020}, pages = {123265}, abstract = {Hydroxyapatite nanoparticles have been investigated as biological agents for the treatment and diagnosis of bone diseases due to their properties, providing high affinity to bone tissues and also due to the possibility to chemically modify the surfaces of these nanoparticles to provide active targeting to bone tumors or other bone disorders. In this work, synthetic hydroxyapatite nanoparticles and their surface modifications with folic and medronic acid were studied. Copper-64 was produced by neutron irradiation in a TRIGA MARK I nuclear reactor, and the functionalized nanoparticles radiolabeled with this radioisotope. The multi-technique characterization includes FTIR, PXRD, TGA, DSC, CHN, Zeta potential, XPS, SEM, TEM, and Gamma spectroscopy. Furthermore, the evaluation of the chemical interaction stability was through leaching tested for efficiency. The results indicate that folic and medronic acids can be covalently bonded to HA surface, producing a new material not yet described in the literature, been stably attached to hydroxyapatite nanoparticle surfaces, able to provide active targeting for bone disorders. The complexation of copper-64 provides high radiochemistry purity, although the specific activity must be improved.}, keywords = {Copper-64, Folate, Hydroxyapatite nanoparticles, Medronate, Theranostic system}, issn = {0254-0584}, doi = {https://doi.org/10.1016/j.matchemphys.2020.123265}, url = {http://www.sciencedirect.com/science/article/pii/S0254058420306350}, author = {Marcelo Fernandes Cipreste and Wagner [da Nova Mussel] and Juliana [Batista da Silva] and Maria [Bet{\^a}nia de Freitas Marques] and Ronaldo Junio [Campos Batista] and Pedro Lana Gastelois and Waldemar [Augusto de Almeida Macedo] and Ed{\'e}sia Martins [Barros de Sousa]} } @article {PACHECO2020103093, title = {Growth and vibrational spectroscopy of K2LiyNixCo1-xSO42.6H2O (y=0.1;0.2;0.3;0.4) crystals}, journal = {Vibrational Spectroscopy}, volume = {109}, year = {2020}, pages = {103093}, abstract = {The mixed crystals of the Tutton{\textquoteright}s salt doped with Li following the empirical formula K2LiyNixCo1-x (SO4)2.6H2O, were synthesized from the slow evaporation of the solvent at constant temperature. The presence of K, S, Ni, Co and O elements in the studied crystalline structure was confirmed by EDS spectroscopy using a scanning electron microscope and their quantification including Li was carried out with the help of ICP-OES technique. Raman spectroscopy in the range 100-3600 cm-1, confirmed the presence of tetrahedral (SO4), octahedral complexes Ni(H2O)6, Co(H2O)6, and H2O molecules in the crystal structure. Our UV{\textendash}vis studies have shown that the mixed crystals have good optical transparency in the ultraviolet (200-350 nm) and infrared (750-1000 nm) region. The direct and indirect optical energy gap of the synthesized crystals were determined from the Tauc{\textquoteright}s plot. XRD diffractograms of the sample crystals do not show any specific changes due to the presence of Li ion in the crystalline network.}, keywords = {Chemical Analysis, Crystal growth, Optical Energy Gap, Raman Spectroscopy, Tutton{\textquoteright}s Salt}, issn = {0924-2031}, doi = {https://doi.org/10.1016/j.vibspec.2020.103093}, url = {http://www.sciencedirect.com/science/article/pii/S0924203120300965}, author = {Tiago S. Pacheco and Z{\'e}lia M.C. Ludwig and Diogo R. Sant{\textquoteright}Anna and Genivaldo J. Perp{\'e}tuo and Carlos J. Franco and Edinei C. Paiva and Santunu Ghosh} } @article {10.7717/peerj.9446, title = {Severe airport sanitarian control could slow down the spreading of COVID-19 pandemics in Brazil}, journal = {PeerJ}, volume = {8}, year = {2020}, pages = {e9446}, abstract = {Background We investigated a likely scenario of COVID-19 spreading in Brazil through the complex airport network of the country, for the 90 days after the first national occurrence of the disease. After the confirmation of the first imported cases, the lack of a proper airport entrance control resulted in the infection spreading in a manner directly proportional to the amount of flights reaching each city, following the first occurrence of the virus coming from abroad. Methodology We developed a Susceptible-Infected-Recovered model divided in a metapopulation structure, where cities with airports were demes connected by the number of flights. Subsequently, we further explored the role of the Manaus airport for a rapid entrance of the pandemic into indigenous territories situated in remote places of the Amazon region. Results The expansion of the SARS-CoV-2 virus between cities was fast, directly proportional to the city closeness centrality within the Brazilian air transportation network. There was a clear pattern in the expansion of the pandemic, with a stiff exponential expansion of cases for all the cities. The more a city showed closeness centrality, the greater was its vulnerability to SARS-CoV-2. Conclusions We discussed the weak pandemic control performance of Brazil in comparison with other tropical, developing countries, namely India and Nigeria. Finally, we proposed measures for containing virus spreading taking into consideration the scenario of high poverty.}, keywords = {Amazonia, Indigenous people, Metapopulation dynamics, One-Ecohealth, SARS-CoV-2 pandemic, SIR model}, issn = {2167-8359}, doi = {10.7717/peerj.9446}, url = {https://doi.org/10.7717/peerj.9446}, author = {Ribeiro, S{\'e}rvio Pontes and Castro e Silva, Alcides and D{\'a}ttilo, Wesley and Reis, Alexandre Barbosa and G{\'o}es-Neto, Arist{\'o}teles and Alcantara, Luiz Carlos Junior and Giovanetti, Marta and Coura-vital, Wendel and Fernandes, Geraldo Wilson and Azevedo, Vasco Ariston C.} } @article {Almeida2020, title = {Green Propolis: In Vitro Photoprotective and Photostability Studies of Single and Incorporated Extracts in a Sunscreen Formulation}, journal = {Revista Brasileira de Farmacognosia}, year = {2020}, abstract = {Propolis is a natural, non-toxic resin produced by honey bees that has been used for hundreds of years for its biological activities, such as antimicrobial, anti-inflammatory, anesthetic, cytostatic, and cariostatic properties. Currently, it is used in food, pharmaceutical, and cosmetic industries. The aim of this work was to evaluate the antioxidant activity, sun protection factor, and photostability of different hydroalcoholic extracts of green propolis. All extracts prepared presented high absorption in the UVB region. The extract of 70\% green propolis (high temperature) was incorporated into Gel Permulen TR-1. This new formulation presented a higher value of sun protection factor. Besides that, the formulation developed with Gel Permulen TR-1 and the hydroalcoholic extract of 70\% green propolis (high temperature) showed good photostability and it was safe to be applied on the skin according the HET-CAM test. These results indicated the potential of hydroalcoholic extracts of 70\% green propolis (high temperature) for use in sunscreen.}, issn = {1981-528X}, doi = {10.1007/s43450-020-00071-z}, url = {https://doi.org/10.1007/s43450-020-00071-z}, author = {Almeida, Wanessa Aparecida da Silveira and Sousa, Lucas Resende Dutra and dos Santos Antunes, Amanda and de Azevedo, Amanda Scofield and do Nascimento, Andr{\~A}{\textcopyright}a Mendes and Amparo, Tatiane Roquete and de Souza, Gustavo Henrique Bianco and dos Santos, Orlando David Henrique and Andrade, {\~A}?ngela Le{\~A}{\textsterling}o and Cazati, Thiago and de Abreu Vieira, Paula Melo and Bueno, Paula Carolina Pires and dos Santos, Viviane Martins Rebello} } @article {doi:10.1002/app.48597, title = {Partially ordered porous structures on layer-by-layer polyaniline/poly(vinyl sulfate sodium) ultrathin films: Easy fabrication of robust submicroscopic patterning}, journal = {Journal of Applied Polymer Science}, volume = {137}, number = {17}, year = {2020}, pages = {48597}, abstract = {ABSTRACT The use of polyaniline (PANI) as a conductive material has steadily increased in recent years due to its interesting physicochemical properties, low manufacturing cost, and easy processing. This conductive material, associated with the diffraction properties of organized nanostructures in thin films, has excellent application potential in microelectronics and photonic devices. Initially, this work presents improvement routes for the breath figure method (a nanopatterning technique) in polystyrene (PS) films through the control of film deposition parameters and the presence of water in the polymer solution. Such improvements are then extended to the production of PANI nanostructures, in the form of pores, from patterned porous PS films. Consequently, PANI films with a partially ordered pore structure (mean pore diameter of ~100 nm) are produced in a facile and easily scalable method. {\textcopyright} 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48597.}, doi = {10.1002/app.48597}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/app.48597}, author = {Faria, A. M. A. and Miranda, M. A. and Gon{\c c}alves, G. E. and R.F. Bianchi and A.G.C. Bianchi and Cuba, C. and Neves, B. R. A. and Pinto, E. S.} } @article {ANTONIAZZI2020, title = {Oxygen intercalated graphene on SiC(0001): Multiphase SiOx layer formation and its influence on graphene electronic properties}, journal = {Carbon}, year = {2020}, abstract = {Low-dimensionality materials are highly susceptible to interfaces. Indeed, intercalation of different chemical species in between epitaxial graphene and silicon carbide (SiC), for instance, may decouple the graphene with respect to the substrate due to the conversion of the buffer layer into a graphene layer. O-intercalation is known to release the strain of such 2D material and to lead to the formation of high structural quality AB-stacked bilayer graphene. Nonetheless, this interface transformation concomitantly degrades graphene electronic transport properties. In this work we employed different techniques in order to better understand the structure of the graphene/SiC interface generated by O-intercalation and to elucidate the origin of the poor electronic properties of graphene. Experimental results revealed the formation of a SiO2 rich layer with a defective transition layer in between it and the SiC, which is characterized by the existence of silicon oxycarbide structures. Scanning tunneling spectroscopy measurements revealed an extensive presence of electronic states just around the Fermi level all over the sample surface, which may suppress the charge carriers mobility around this region. According to theoretical calculations, such states are mainly due to the formation of silicon oxicarbides within the interfacial layer.}, issn = {0008-6223}, doi = {https://doi.org/10.1016/j.carbon.2020.05.064}, url = {http://www.sciencedirect.com/science/article/pii/S0008622320305054}, author = {Igor Antoniazzi and Chagas, Thais and Matos, Matheus J. S. and Lucas A.B. Mar{\c c}al and Edmar A. Soares and Mazzoni, M{\'a}rio S. C. and Roberto H. Miwa and Jo{\~a}o Marcelo J. Lopes and {\^A}ngelo Malachias and Rog{\'e}rio Magalh{\~a}es-Paniago and Myriano H. Oliveira} } @article {DEFREITAS2020110849, title = {Water Diffusion in Carbon Nanotubes Under Directional Electric Fields: Coupling Between Mobility and Hydrogen Bonding}, journal = {Chemical Physics}, year = {2020}, pages = {110849}, abstract = {Molecular Dynamics simulations of water confined in carbon nanotubes subjected to external electric fields show that water mobility strongly depends on the confining geometry, the intensity and directionality of the electric field. While fields forming angles of 0{\textdegree} and 45{\textdegree} slow down the water dynamics by increasing organization, perpendicular fields can enhance water diffusion by decreasing hydrogen bond formation. For 1.2 diameter long nanotubes, the parallel field destroys the ice-like water structure increasing mobility. These results indicate that the structure and dynamics of confined water are extremely sensitive to external fields and can be used to facilitate filtration processes.}, keywords = {Carbon nanotube, Electric Fields, Hydrogen Bonds, Water}, issn = {0301-0104}, doi = {https://doi.org/10.1016/j.chemphys.2020.110849}, url = {http://www.sciencedirect.com/science/article/pii/S0301010420301592}, author = {D{\'e}bora N. [de Freitas] and Bruno H.S. Mendon{\c c}a and Mateus H. K{\"o}hler and Barbosa, Marcia C. and Matos, Matheus J. S. and Batista, Ronaldo J. C. and Alan B. [de Oliveira]} } @article {10.3389/fchem.2020.00360, title = {Synthesis of 2,1,3-Benzoxadiazole Derivatives as New Fluorophores{\textemdash}Combined Experimental, Optical, Electro, and Theoretical Study}, journal = {Frontiers in Chemistry}, volume = {8}, year = {2020}, pages = {360}, abstract = {Herein, we report the synthesis and characterization of fluorophores containing a 2,1,3-benzoxadiazole unit associated with a π-conjugated system (D-π-A-π-D). These new fluorophores in solution exhibited an absorption maximum at around ~419 nm (visible region), as expected for electronic transitions of the π-π* type (ε ~2.7 {\texttimes} 107 L mol-1 cm-1), and strong solvent-dependent fluorescence emission (ΦFL ~0.5) located in the bluish-green region. The Stokes{\textquoteright} shift of these compounds is ca. 3,779 cm-1, which was attributed to an intramolecular charge transfer (ICT) state. In CHCl3 solution, the compounds exhibited longer and shorter lifetimes, which was attributed to the emission of monomeric and aggregated molecules, respectively. Density functional theory was used to model the electronic structure of the compounds 9a{\textendash}d in their excited and ground electronic states. The simulated emission spectra are consistent with the experimental results, with different solvents leading to a shift in the emission peak and the attribution of a π-π* state with the characteristics of a charge transfer excitation. The thermal properties were analyzed by thermogravimetric analysis, and a high maximum degradation rate occurred at around 300{\textdegree}C. Electrochemical studies were also performed in order to determine the band gaps of the molecules. The electrochemical band gaps (2.48{\textendash}2.70 eV) showed strong correlations with the optical band gaps (2.64{\textendash}2.67 eV).}, issn = {2296-2646}, doi = {10.3389/fchem.2020.00360}, url = {https://www.frontiersin.org/article/10.3389/fchem.2020.00360}, author = {Frizon, Tiago E. A. and Vieira, Andr{\'e} A. and da Silva, Fabricia N. and Saba, Sumbal and Farias, Giliandro and de Souza, Bernardo and Zapp, Eduardo and L{\^o}po, Michell N. and Braga, Hugo de C. and Grillo, Felipe and Curcio, Sergio F. and Cazati, Thiago and Rafique, Jamal} } @article {Ribeiro2020.03.26.20044370, title = {Severe airport sanitarian control could slow down the spreading of COVID-19 pandemics in Brazil}, journal = {medRxiv}, year = {2020}, publisher = {Cold Spring Harbor Laboratory Press}, abstract = {Background. We investigated a likely scenario of COVID-19 spreading in Brazil through the complex airport network of the country, for the 90 days after the first national occurrence of the disease. After the confirmation of the first imported cases, the lack of a proper airport entrance control resulted in the infection spreading in a manner directly proportional to the amount of flights reaching each city, following first occurrence of the virus coming from abroad. Methodology. We developed a SIR (Susceptible-Infected-Recovered) model divided in a metapopulation structure, where cities with airports were demes connected by the number of flights. Subsequently, we further explored the role of Manaus airport for a rapid entrance of the pandemic into indigenous territories situated in remote places of the Amazon region. Results. The expansion of the SARS-CoV-2 virus between cities was fast, directly proportional to the airport closeness centrality within the Brazilian air transportation network. There was a clear pattern in the expansion of the pandemic, with a stiff exponential expansion of cases for all cities. The more an airport showed closeness centrality, the greater was its vulnerability to SARS-CoV-2. Conclusions. We discussed the weak pandemic control performance of Brazil in comparison with other tropical, developing countries, namely India and Nigeria. Finally, we proposed measures for containing virus spreading taking into consideration the scenario of high poverty.Competing Interest StatementThe authors have declared no competing interest.Funding StatementFunding by CNPqAuthor DeclarationsAll relevant ethical guidelines have been followed; any necessary IRB and/or ethics committee approvals have been obtained and details of the IRB/oversight body are included in the manuscript.YesAll necessary patient/participant consent has been obtained and the appropriate institutional forms have been archived.YesI understand that all clinical trials and any other prospective interventional studies must be registered with an ICMJE-approved registry, such as ClinicalTrials.gov. I confirm that any such study reported in the manuscript has been registered and the trial registration ID is provided (note: if posting a prospective study registered retrospectively, please provide a statement in the trial ID field explaining why the study was not registered in advance).Yes I have followed all appropriate research reporting guidelines and uploaded the relevant EQUATOR Network research reporting checklist(s) and other pertinent material as supplementary files, if applicable.YesI state all data will be available in submission material}, doi = {10.1101/2020.03.26.20044370}, url = {https://www.medrxiv.org/content/early/2020/03/27/2020.03.26.20044370}, author = {Ribeiro, Servio Pontes and Dattilo, Wesley and Castro e Silva, Alcides and Reis, Alexandre Barbosa and Goes-Neto, Aristoteles and Alcantara, Luiz and Giovanetti, Marta and Fernandes, Geraldo Wilson and Azevedo, Vasco Ariston and Coura-vital, Wendel} } @article {doi:10.1142/S0217751X20400412, title = {Viscous effects in the dark sector of the Universe}, journal = {International Journal of Modern Physics A}, volume = {35}, number = {02n03}, year = {2020}, pages = {2040041}, abstract = {Viscous properties are attributed to the dark sector of the Universe. They contribute to the accelerated expansion phase of the Universe and can alleviate existing tensions in the ΛCDM model at small scales. We provide a short review of recent efforts on this topic. Different viscous models for the dark sector are analysed both from theoretical and observational point of view.}, doi = {10.1142/S0217751X20400412}, url = {https://doi.org/10.1142/S0217751X20400412}, author = {Fabris, J. C. and Caram{\^e}s, T. R. P. and Wojnar, A. and Velten, H. E. S.} } @article {PhysRevD.101.023518, title = {Skewness of matter distribution in clustering dark energy cosmologies}, journal = {Phys. Rev. D}, volume = {101}, year = {2020}, month = {Jan}, pages = {023518}, publisher = {American Physical Society}, doi = {10.1103/PhysRevD.101.023518}, url = {https://link.aps.org/doi/10.1103/PhysRevD.101.023518}, author = {Velten, Hermano and Fazolo, Raquel Emy} } @article {PhysRevD.101.043502, title = {Is the Hubble diagram of quasars in tension with concordance cosmology?}, journal = {Phys. Rev. D}, volume = {101}, year = {2020}, month = {Feb}, pages = {043502}, publisher = {American Physical Society}, doi = {10.1103/PhysRevD.101.043502}, url = {https://link.aps.org/doi/10.1103/PhysRevD.101.043502}, author = {Velten, Hermano and Gomes, Syrios} } @article {Souza_2020, title = {Oxidation-driven formation of precisely ordered antimonene nanoribbons}, journal = {Journal of Physics: Condensed Matter}, year = {2020}, month = {jan}, publisher = {IOP Publishing}, abstract = {The control of geometric structure is a key aspect in the interplay between theoretical predictions and experimental realization in the science and applications of nanomaterials. This is particularly important in one-dimensional structures such as nanoribbons, in which the edge morphology dictates most of the electronic behavior in low energy scale. In the present work we demonstrate by means of first principles calculations that the oxidation of few-layer antimonene may lead to an atomic restructuring with formation of ordered multilayer zig-zag nanoribbons. The widths are uniquely determined by the number of layers of the initial structure, allowing the synthesis of ultranarrow ribbons and chains. We also show that the process may be extended to other compounds based on group V elements, such as arsenene. The characterization of the electronic structure of the resulting ribbons shows an important effect of stacking on band gaps and on modulation of electronic behavior.}, doi = {10.1088/1361-648x/ab678b}, url = {https://doi.org/10.1088\%2F1361-648x\%2Fab678b}, author = {Alan Souza and Matheus J S Matos and Mario S C Mazzoni} } @article {RODRIGUES2019, title = {Radia{\~A}\S{\~A}\poundso de baixa frequ{\~A}\textordfemeninencia e poss{\~A}\-vel influ{\~A}\textordfemeninencia nociva a sistemas biol{\~A}\textthreesuperiorgicos}, journal = {Revista Brasileira de Ensino de F{\~A}\-sica}, volume = {41}, year = {2019}, month = {00}, publisher = {scielo}, issn = {1806-1117}, url = {http://www.scielo.br/scielo.php?script=sci_arttext\&pid=S1806-11172019000300413\&nrm=iso}, author = {Rodrigues, F.G.F. and Brizola, A.} } @article {16071, title = {O que conhecemos de todos o cosmos?}, journal = {Revista Conex{\~o}es }, volume = {13}, number = {4}, year = {2019}, pages = {63-69}, abstract = { v. 13, n. 4 (2019): Especial: F{\'\i}sica p.63-69 }, url = {https://doi.org/10.21439/conexoes.v13i4.1864}, author = {Hermano Endlich Schneider Velten} } @article {doi:10.1142/S021827181950175X, title = {Nonconservative traceless type gravity}, journal = {International Journal of Modern Physics D}, volume = {28}, number = {15}, year = {2019}, pages = {1950175}, abstract = {Extensions of the gravity theory in order to obtain traceless field equations have been widely considered in the literature. The leading example of such class of theories is the unimodular gravity, but there are other possibilities like the mimetic gravity and the Rastall gravity with a coupling parameter λ = 1/2. The unimodular gravity proposal is a very interesting approach in order to address the cosmological constant problem. When coupled to matter, such theories may imply that the energy{\textendash}momentum tensor is not divergence free anymore. In this paper, a unimodular type theory will be developed by evading the conservation T;μμν = 0. The cosmological consequences of the later, both at background as well as for scalar and tensor perturbations, are explored. Possible further extensions of this approach are discussed as well as its connection with the traditional unimodular gravity.}, doi = {10.1142/S021827181950175X}, url = {https://doi.org/10.1142/S021827181950175X}, author = {Daouda, Mahamadou and Fabris, J. C. and Oliveira, A. M. and Smirnov, F. and Velten, H. E. S.} } @article {BARBOZA2019108, title = {Graphene/h-BN heterostructures under pressure: From van der Waals to covalent}, journal = {Carbon}, volume = {155}, year = {2019}, pages = {108 - 113}, abstract = {Scanning probe microscopy and ab initio calculations reveal modifications on the electronic and structural properties of graphene/h-BN heterostructures induced by compression. Using AFM and EFM techniques, with charge injection being made in the heterostructures at different pressures, the charge injection efficiency monotonically decreases with increasing pressure for monolayer-graphene (MLG)+BN heterostructures, indicative of a conductor-insulator electronic transition. Bilayer-graphene (BLG)+BN and trilayer-graphene (TLG)+BN heterostructures show a non-monotonic behavior of charge injection versus pressure, indicative of competing electronic structure modifications. First-principle calculations of these systems indicate a pressure-induced van der Waals-to-covalent interlayer transition, where such interlayer covalent binding, in the presence of water molecules, results in a disordered insulating structure for the MLG~+~BN case, while it leads to an ordered conducting structure for both BLG~+~BN and TLG~+~BN heterostructures. These opposing effects may have a strong influence on graphene/h-BN-based electronic devices and their physics under pressurized environments.}, issn = {0008-6223}, doi = {https://doi.org/10.1016/j.carbon.2019.08.054}, url = {http://www.sciencedirect.com/science/article/pii/S0008622319308632}, author = {Barboza, Ana P. M. and Alan C.R. Souza and Matos, Matheus J. S. and Juliana C. Brant and Tiago C. Barbosa and Chacham, Helio and Mazzoni, Mario S. C. and Neves, Bernardo R. A.} } @article {Brando_2019, title = {Modified gravity away from a $\upLambda$CDM background}, journal = {Journal of Cosmology and Astroparticle Physics}, volume = {2019}, number = {11}, year = {2019}, month = {nov}, pages = {018{\textendash}018}, publisher = {IOP Publishing}, abstract = {Within the effective field theory approach to cosmic acceleration, the background expansion can be specified separately from the gravitational modifications. We explore the impact of modified gravity in a background different from a cosmological constant plus cold dark matter (ΛCDM) on the stability and cosmological observables, including covariance between gravity and expansion parameters. In No Slip Gravity the more general background allows more gravitational freedom, including both positive and negative Planck mass running. We examine the effects on cosmic structure growth, as well as showing that a viable positive integrated Sachs-Wolfe effect crosscorrelation easily arises from this modified gravity theory. Using current data we constrain parameters with a Monte Carlo analysis, finding a bound on the running |αM,max|≲~0.03 (95\% CL) for the adopted form at all cosmic times. We provide the modified hi_class code publicly on GitHub, now enabling computation and inclusion of the redshift space distortion observable fσ8 as well as the No Slip Gravity modifications.}, doi = {10.1088/1475-7516/2019/11/018}, url = {https://doi.org/10.1088\%2F1475-7516\%2F2019\%2F11\%2F018}, author = {Guilherme Brando and Felipe T. Falciano and Eric V. Linder and Velten, Hermano E.S.} } @article {Louren{\c c}o2019, title = {Recruitment and entropy decrease during trail formation by foraging ants}, journal = {Insectes Sociaux}, year = {2019}, month = {Oct}, abstract = {Social insects utilise a complex spatial orientation system mediated by chemical signals. This study investigated how the foraging behaviour of ants (Dorymyrmex thoracicus) varies depending on the quantity of an available resource using a field experiment. Further, we demonstrated computationally that ant displacement is compatible with a model based on pheromone deposition. Our experiment tested how the resource size (large or small) and availability (one or two simultaneous patches) of resources offered influence the number of recruited ants (traffic flow) and the speed of traffic flow both moving towards a resource and returning to the colony. The results showed that the returning flow was higher than the going flow independent of resource. The traffic flow towards a single resource was higher than the flow for either of two simultaneous resources patches offered; thus, multiple resources sources split the flow, regardless of the fact that resource size did not affect foraging choices. Our results indicated that the ants used an orientation mechanism that can be reproduced by a theoretical computer model. With our model, we showed that initially, the displacement of ants followed no clearly detectable pattern. However, with increasing levels of ant recruitment and consequent pheromone deposition on the most used trails, returning displacement revealed the formation of shorter and more organised trails. The model revealed key transition between periods of order and disorder that continued until the flow of information reached an organised state (Shannon entropy). This study highlights an exceptional mechanism of foraging optimisation in eusocial insects.}, issn = {1420-9098}, doi = {10.1007/s00040-019-00728-6}, url = {https://doi.org/10.1007/s00040-019-00728-6}, author = {Louren{\c c}o, G. M. and Keesen, F. and Fagundes, R. and Luna, P. and Silva, A. C. and Ribeiro, S. P. and Arashiro, E.} } @article {universe5100203, title = {Flavour Composition and Entropy Increase of Cosmological Neutrinos After Decoherence}, journal = {Universe}, volume = {5}, number = {10}, year = {2019}, abstract = {We propose that gravitational interactions of cosmic neutrinos with the statistically homogeneous and isotropic fluctuations of space-time lead to decoherence. This working hypothesis, which we describe by means of a Lindblad operator, is applied to the system of two- and three-flavour neutrinos undergoing vacuum oscillations and the consequences are investigated. As a result of this decoherence we find that the neutrino entropy would increase as a function of initial spectral distortions, mixing angles and charge-parity (CP)-violation phase. Subsequently we discuss the chances to discover such an increase observationally (in principle). We also present the expected flavour composition of the cosmic neutrino background after decoherence is completed. The physics of two- or three-flavour oscillation of cosmological neutrinos resembles in many aspects two- or three-level systems in atomic clocks, which were recently proposed by Weinberg for the study of decoherence phenomena.}, issn = {2218-1997}, doi = {10.3390/universe5100203}, url = {https://www.mdpi.com/2218-1997/5/10/203}, author = {Boriero, Daniel and Schwarz, Dominik J. and Velten, Hermano} } @article {CALHEIRO2019111480, title = {Tuning the detection limit in hybrid organic-inorganic materials for improving electrical performance of sensing devices}, journal = {Sensors and Actuators A: Physical}, volume = {298}, year = {2019}, pages = {111480}, abstract = {Research in hybrid electronics has included advances in materials, devices and architectures. However, in practice, controversy still exists on some details which limit hybrid materials to high-performance applications, such as processing{\textendash}structure{\textendash}design{\textendash}property relations. This paper describes a practical approach to enhancing the sensing performance of a prototype ammonia gas sensor based on electrical conductivity changes, percolation theory and current limitation to a semiconducting polymer-metal oxide medium. This device is based on fully-gravure printed polyaniline/indium - tin oxide nanocomposites, Pani100-xITOx [0 <= x<= 100\% (wt/wt)], layers on a freestanding high-density polyethylene substrate. We find that the electrical current of the device decreases and tends to saturate as the gas concentration increases, and the value of this electrical current limit (IL) depends on x: the higher the value of x, the smaller the IL, when the current that flows through the electronic device was dominated by the ITO-nanoparticle filled PAni, which increase the concentration of hopping carriers and contribute to the desired electrical response of a heterogeneous gas sensor. In this regime, we find a good linear relationship between x and ammonia concentration. These findings suggest new directions for future research on the development and investigation of organic-inorganic devices in which the electrical current variation is desired for enhanced sensitivity and stability of hybrid sensors.}, keywords = {Device performance, Flexible devices, Hopping mechanism, Organic electronics}, issn = {0924-4247}, doi = {https://doi.org/10.1016/j.sna.2019.07.005}, url = {http://www.sciencedirect.com/science/article/pii/S0924424719304467}, author = {D.S. Calheiro and R.F. Bianchi} } @article {doi:10.1021/acs.jpcc.9b02491, title = {Graphene/h-BN In-Plane Heterostructures: Stability and Electronic and Transport Properties}, journal = {The Journal of Physical Chemistry C}, volume = {123}, number = {30}, year = {2019}, pages = {18600-18608}, doi = {10.1021/acs.jpcc.9b02491}, url = {https://doi.org/10.1021/acs.jpcc.9b02491}, author = {Nascimento, Regiane and Moraes, Elizane E. and Matos, Matheus J. S. and Prendergast, David and Manhabosco, Taise M. and de Oliveira, Alan B. and Chacham, H{\'e}lio and Batista, Ronaldo J. C.} } @article {10.1088/1361-6528/ab3732, title = {Exfoliation and characterization of a two-dimensional serpentine-based material}, journal = {Nanotechnology}, year = {2019}, abstract = {We report on an experimental investigation of serpentine, an abundant phyllosilicate, as an alternative source of two-dimensional (2D) nanomaterials. We show, through scanning probe microscopy (SPM) measurements, that natural serpentine mineral can be mechanically exfoliated down to few-layer flakes, where monolayers can be easily resolved. The parent serpentine bulk material was initially characterized via conventional techniques like XRD, XPS, FTIR and Raman spectroscopies and the results show that it is predominantly constituted by the antigorite mineral. From ab initio calculations using DFT, we also determine the geometry and electronic structure of antigorite, the observed structural form of serpentine. Additionally, we further characterized electrical and mechanical properties of the obtained 2D material flakes using SPM and broadband synchrotron infrared nanospectroscopy. Wavelength tuning of the serpentine vibrational resonances, assigned to in- and out-of-plane molecular vibrations, are observed and compared with the FTIR characterization of the parent bulk material. They show that there is no degradation of serpentine{\textquoteleft}s structural properties during its mechanical exfoliation down to nanometer-thin sheets. Therefore, our results introduce the serpentine mineral as an attractive low-cost candidate in 2D materials applications.}, url = {http://iopscience.iop.org/10.1088/1361-6528/ab3732}, author = {Joyce Santos and Ana Barboza and Matheus J S Matos and Ingrid D. Barcelos and Thales Fernando Damasceno Fernandes and Edmar A Soares and Roberto Luiz Moreira and Almeida Neves, Bernardo Ruegger} } @article {Zimdahl:2017cpa, title = {Matter growth in extended ${\L}ambda$CDM cosmology}, journal = {Int. J. Mod. Phys.}, volume = {D28}, number = {06}, year = {2019}, pages = {1950086}, doi = {10.1142/S021827181950086X}, author = {Zimdahl, W. and Velten, H. E. S. and Algoner, W. C.} } @article {PhysRevD.99.124031, title = {Existence of static spherically-symmetric objects in action-dependent Lagrangian theories}, journal = {Phys. Rev. D}, volume = {99}, year = {2019}, month = {Jun}, pages = {124031}, publisher = {American Physical Society}, doi = {10.1103/PhysRevD.99.124031}, url = {https://link.aps.org/doi/10.1103/PhysRevD.99.124031}, author = {Fabris, Julio C. and Velten, Hermano and Wojnar, Aneta} } @article {universe5060138, title = {The Effective Field Theory of Dark Energy Diagnostic of Linear Horndeski Theories After GW170817 and GRB170817A}, journal = {Universe}, volume = {5}, number = {6}, year = {2019}, abstract = {We summarize the effective field theory of dark energy construction to explore observable predictions of linear Horndeski theories. We review the diagnostic of these theories on the correlation of the large-scale structure phenomenological functions: the effective Newton constant, the light deflection parameter, and the growth function of matter perturbations. We take this opportunity to discuss the evolution of the bounds the propagation speed of gravitational waves has undergone and use the most restrictive one to update the diagnostic.}, issn = {2218-1997}, doi = {10.3390/universe5060138}, url = {https://www.mdpi.com/2218-1997/5/6/138}, author = {Perenon, Louis and Velten, Hermano} } @article {doi:10.1002/ejic.201900265, title = {New Boron(III) Blue Emitters for All-Solution Processed OLEDs: Molecular Design Assisted by Theoretical Modeling}, journal = {European Journal of Inorganic Chemistry}, volume = {2019}, number = {17}, year = {2019}, pages = {2247-2257}, abstract = {Luminescent boron(III) complexes have recently been employed as emitters in organic light-emitting diodes (OLEDs) with reasonable success. They are easy to prepare and sufficiently stable to be used in such devices, being of great interest as a simple molecular emissive layer. Although emitters for this class with all colors have already been reported, highly efficient and stable blue emitters for applications in solution processed devices still pose a challenge. Here, we report the design, synthesis, and characterization of new boron complexes based on the 2-(benzothiazol-2-yl)phenol ligand (HBT), with different donor and acceptor groups responsible for modulating the emission properties, from blue to red. The molecular design was assisted by calculations using our newly developed formalism, where we demonstrate that the absorption and fluorescence spectra can be successfully predicted, which is a powerful technique to evaluate molecular photophysical properties prior to synthesis. In addition, density functional theory (DFT) enables us to understand the molecular and electronic structure of the molecules in greater detail. The molecules studied here presented fluorescence efficiencies as high as Φ = 0.88 and all solution processed OLEDs were prepared and characterized under an ambient atmosphere, after dispersion in the emitting layer. Surprisingly, even considering these rather simple experimental conditions, the blue emitters displayed superior properties compared to those in the present literature, in particular with respect to the stability of the current efficiency.}, keywords = {Blue emitters, Boron, Density functional calculations, Luminescence, Solution processed OLEDs, Theoretical modeling}, doi = {10.1002/ejic.201900265}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/ejic.201900265}, author = {Salla, Cristian A. M. and Teixeira dos Santos, J{\'e}ssica and Farias, Giliandro and Bortoluzi, Adailton J. and Curcio, Sergio F. and Cazati, Thiago and Izs{\'a}k, R{\'o}bert and Neese, Frank and de Souza, Bernardo and Bechtold, Ivan H.} } @article {universe5030068, title = {Matter Growth in Imperfect Fluid Cosmology}, journal = {Universe}, volume = {5}, number = {3}, year = {2019}, abstract = {Extensions of Einstein\’s General Relativity (GR) can formally be given a GR structure in which additional geometric degrees of freedom are mapped on an effective energy-momentum tensor. The corresponding effective cosmic medium can then be modeled as an imperfect fluid within GR. The imperfect fluid structure allows us to include, on a phenomenological basis, anisotropic stresses and energy fluxes which are considered as potential signatures for deviations from the cosmological standard \Λ -cold-dark-matter ( \Λ CDM) model. As an example, we consider the dynamics of a scalar-tensor extension of the standard model, the e \Φ \Λ CDM model. We constrain the magnitudes of anisotropic pressure and energy flux with the help of redshift-space distortion (RSD) data for the matter growth function f \σ 8 .}, issn = {2218-1997}, doi = {10.3390/universe5030068}, url = {http://www.mdpi.com/2218-1997/5/3/68}, author = {Zimdahl, Winfried and Velten, Hermano E.S. and Algoner, William C.} } @article {DIAS2019172, title = {Ab initio molecular dynamics simulation of methanol and acetonitrile: The effect of van der Waals interactions}, journal = {Chemical Physics Letters}, volume = {714}, year = {2019}, pages = {172 - 177}, abstract = {We employed PBE and BLYP semi-local functionals and the van der Waals density functional of Dion et al. (2004) (vdW-DF) to investigate structural properties of liquid acetonitrile and methanol. Among those functionals the vdW-DF is the only one that correctly predicts energy minima in inter-molecular interactions between acetonitrile molecules. We found that van der Waals interactions have a negligible effect on H-bonds in methanol chains. However, it significantly increases chain packing resulting in a more dense liquid in comparison to the other two functionals. The overall trend is that the vdW-DF tends to overestimate density and bulk modulus, meanwhile the semi-local functionals tend to underestimate density. Thus, van der Waals interactions play an important role in the properties of liquids in which much stronger dipole-dipole interactions are present.}, issn = {0009-2614}, doi = {https://doi.org/10.1016/j.cplett.2018.10.085}, url = {http://www.sciencedirect.com/science/article/pii/S0009261418309096}, author = {Dias, Rafael F. and Cleidineia C. da Costa and Manhabosco, Taise M. and de Oliveira, Alan B. and Matos, Matheus J. S. and Soares, Jaqueline S. and Batista, Ronaldo J. C.} } @article {SOUZA2019143, title = {Adsorption of CO2 on biphasic and amorphous calcium phosphates: An experimental and theoretical analysis}, journal = {Chemical Physics Letters}, volume = {714}, year = {2019}, pages = {143 - 148}, abstract = {Calcium phosphates are suggested as a CO2 adsorbent via pressure swing adsorption. Amorphous calcium phosphate (ACP) and biphasic calcium phosphate (BCP) (composed of hydroxyapatite and beta-tricalcium phosphate) were investigated for the capture/immobilization of the gas. A fluidized bed was set up to assess the levels of CO2 adsorption by ACP and BCP. A gaseous mixture was synthesized, mimicking the conditions for possible industrial use. The results show a significant reduction in CO2 concentrations. Using DFT calculations, we show that CO2 adsorption increases the stability by reducing the surface energy. The energies involved and preferential adsorption sites were also theoretically predicted.}, keywords = {Calcium phosphate, CO adsorption, DFT calculations}, issn = {0009-2614}, doi = {https://doi.org/10.1016/j.cplett.2018.10.080}, url = {http://www.sciencedirect.com/science/article/pii/S0009261418309072}, author = {F.S. Souza and Matos, M. J. S. and B.R.L. Galv{\~a}o and A.F.C. Arapiraca and S.N. da Silva and I.P. Pinheiro} } @article {C8CP07005A, title = {Dynamics of aggregated states resolved by gated fluorescence in films of room temperature phosphorescent emitters}, journal = {Phys. Chem. Chem. Phys.}, volume = {21}, year = {2019}, pages = {3814-3821}, publisher = {The Royal Society of Chemistry}, abstract = {Phenazine derivative molecules were studied using steady state and time resolved fluorescence techniques and demonstrated to lead to strong formation of aggregated species, identified as dimers by time dependent density functional theory calculations. Blended films in a matrix of Zeonex{\textregistered}, produced at different concentrations, showed different contributions of dimer and monomer emissions in a prompt time frame, e.g. less than 50 ns. In contrast, the phosphorescence (e.g. emission from the triplet state) shows no significant effect on dimer formation, although strong dependence of the phosphorescence intensity on concentration is observed, leading to phosphorescence being quenched at higher concentration.}, doi = {10.1039/C8CP07005A}, url = {http://dx.doi.org/10.1039/C8CP07005A}, author = {dos Santos, Paloma L. and Silveira, Orlando J. and Huang, Rongjuan and Jardim, Guilherme A. M. and Matos, Matheus J. S. and da Silva J{\'u}nior, Eufr{\^a}nio N. and Monkman, Andrew P. and Dias, Fernando B. and Luiz A. Cury} } @article {doi:10.1142/S0129183118501206, title = {Ripples and grains segregation on unpaved road}, journal = {International Journal of Modern Physics C}, volume = {29}, number = {12}, year = {2018}, pages = {1850120}, abstract = {Ripples or corrugations are common phenomena observed in unpaved roads in less developed countries or regions. They cause several damages in vehicles leading to increased maintenance and product costs. In this paper, we present a computational study about the so-called washboard roads. Also, we study grain segregation on unpaved roads. Our simulations have been performed by the Discrete Element Method (DEM). In our model, the grains are regarded as soft disks. The grains are subjected to a gravitational field and both translational and rotational movements are allowed. The results show that wheels{\textquoteright} of different sizes, weights and moving with different velocities can change corrugations amplitude and wavelength. Our results also show that some wavelength values are related to specific wheels{\textquoteright} speed intervals. Segregation has been studied in roads formed by three distinct grain diameters distribution. We observed that the phenomenon is more evident for higher grain size dispersion.}, doi = {10.1142/S0129183118501206}, url = {https://doi.org/10.1142/S0129183118501206}, author = {da Silva, Tiago Moy and Am{\'e}rico T. Bernardes} } @article {COSTA JUNIOR2018, title = {Divulgac{\~a}o e ensino de Astronomia e F{\'\i}sica por meio de abordagens informais}, journal = {Revista Brasileira de Ensino de F{\~A}\-sica}, volume = {40}, year = {2018}, month = {00}, publisher = {scielo}, issn = {1806-1117}, url = {http://www.scielo.br/scielo.php?script=sci_arttext\&pid=S1806-11172018000400603\&nrm=iso}, author = {Costa Junior, Edio da and Fernandes, Bruno da Silva and Lima, Guilherme da Silva and Siqueira, Andreza de Jesus and Paiva, J{\'e}ssica Nat{\'a}lia Miranda and Santos, Marina Gomes e and Tavares, Jo{\~a}o Pedro and Souza, Taynara Vit{\'o}ria de and Gomes, Thaciara Marcela Ferreira} } @article {doi:10.1021/acsnano.8b01911, title = {Effects of a magnetic field on the dynamics of the one-dimensional Heisenberg model with Dzyaloshinskii-Moriya interactions Phys. Rev. E}, journal = {PHYSICAL REVIEW E}, year = {2018}, pages = {null}, url = {https://journals-aps.ez28.periodicos.capes.gov.br/pre/accepted/7007eRb7F171b01d56c85263bac1d606df09a096a}, author = {Silva Nunes, Maria Eug{\^e}nia and {\'E}rica de Mello Silva and Paulo H. L. Martins and J. A. Plascak and Jo{\~a}o Florencio} } @article {article, title = {Preliminary Studies of the Cytotoxicity and Photoprotective Properties of Benzophenone and Lactone Derivatives}, journal = {Revista Virtual de Qu{\'\i}mica}, volume = {10}, year = {2018}, month = {05}, pages = {600-608}, author = {da C. Gon{\c c}alves, Marlucy and Taylor, Jason and Rossoni J{\'u}nior, Joamyr and Carolina S. Rabelo, Ana and Costa, Daniela and Cazati, Thiago and M. R. dos Santos, Viviane} } @article {doi:10.1021/acsnano.8b01911, title = {Compression-Induced Modification of Boron Nitride Layers: A Conductive Two-Dimensional BN Compound}, journal = {ACS Nano}, year = {2018}, note = {PMID: 29787237}, pages = {null}, doi = {10.1021/acsnano.8b01911}, url = {https://doi.org/10.1021/acsnano.8b01911}, author = {Barboza, Ana P. M. and Matos, Matheus J. S. and Chacham, Helio and Batista, Ronaldo J. C. and de Oliveira, Alan B. and Mazzoni, Mario S. C. and Neves, Bernardo R. A.} } @article {doi:10.1021/acs.langmuir.8b00506, title = {Thionine Self-Assembled Structures on Graphene: Formation, Organization, and Doping}, journal = {Langmuir}, volume = {34}, number = {23}, year = {2018}, note = {PMID: 29792809}, pages = {6903-6911}, doi = {10.1021/acs.langmuir.8b00506}, url = {https://doi.org/10.1021/acs.langmuir.8b00506}, author = {de Sousa, Thiago A. S. L. and Fernandes, Thales F. D. and Matos, Matheus J. S. and Araujo, Eduardo N. D. and Mazzoni, Mario S. C. and Neves, Bernardo R. A. and Plentz, Fl{\'a}vio} } @article {doi:10.1021/acsnano.7b08843, title = {Self-Assembly of Ionic Microgels Driven by an Alternating Electric Field: Theory, Simulations, and Experiments}, journal = {ACS Nano}, year = {2018}, note = {PMID: 29634232}, pages = {null}, doi = {10.1021/acsnano.7b08843}, url = {https://doi.org/10.1021/acsnano.7b08843}, author = {Colla, Thiago and Mohanty, Priti S. and N{\"o}jd, Sofi and Bialik, Erik and Riede, Aaron and Schurtenberger, Peter and Likos, Christos N.} } @article {0953-8984-30-17-175302, title = {Twisted bilayer graphene photoluminescence emission peaks at van Hove singularities}, journal = {Journal of Physics: Condensed Matter}, volume = {30}, number = {17}, year = {2018}, pages = {175302}, abstract = {We report on photoluminescence emission imaging by femtosecond laser excitation on twisted bilayer graphene samples. The emission images are obtained by tuning the excitation laser energies in the near infrared region. We demonstrate an increase of the photoluminescence emission at excitation energies that depends on the bilayer twist angle. The results show a peak for the light emission when the excitation is in resonance with transitions at the van Hove singularities in the electronic density of states. We measured the photoluminescence excitation peak position and width for samples with various twist angles showing resonances in the energy range of 1.2 to 1.7 eV.}, url = {http://stacks.iop.org/0953-8984/30/i=17/a=175302}, author = {Thonimar V Alencar and Driele von Dreifus and Maria Gabriela Cota Moreira and Gomes S N Eliel and Chao-Hui Yeh and Po-Wen Chiu and Marcos A Pimenta and Leandro M Malard and Ana Maria de Paula} } @article {Cariglia2018, title = {Cosmological aspects of the Eisenhart{\textendash}Duval lift}, journal = {The European Physical Journal C}, volume = {78}, number = {4}, year = {2018}, month = {Apr}, pages = {314}, abstract = {A cosmological extension of the Eisenhart{\textendash}Duval metric is constructed by incorporating a cosmic scale factor and the energy-momentum tensor into the scheme. The dynamics of the spacetime is governed by the Ermakov{\textendash}Milne{\textendash}Pinney equation. Killing isometries include spatial translations and rotations, Newton{\textendash}Hooke boosts and translation in the null direction. Geodesic motion in Ermakov{\textendash}Milne{\textendash}Pinney cosmoi is analyzed. The derivation of the Ermakov{\textendash}Lewis invariant, the Friedmann equations and the Dmitriev{\textendash}Zel{\textquoteright}dovich equations within the Eisenhart{\textendash}Duval framework is presented.}, issn = {1434-6052}, doi = {10.1140/epjc/s10052-018-5789-x}, url = {https://doi.org/10.1140/epjc/s10052-018-5789-x}, author = {Cariglia, M. and Galajinsky, A. and Gibbons, G. W. and Horvathy, P. A.} } @article {doi:10.1021/acsnano.7b08841, title = {Apparent Softening of Wet Graphene Membranes on a Microfluidic Platform}, journal = {ACS Nano}, year = {2018}, note = {PMID: 29694776}, pages = {null}, doi = {10.1021/acsnano.7b08841}, url = {https://doi.org/10.1021/acsnano.7b08841}, author = {Ferrari, Gustavo A. and de Oliveira, Alan B. and Silvestre, Ive and Matos, Matheus J. S. and Batista, Ronaldo J. C. and Fernandes, Thales F. D. and Meireles, Leonel M. and Eliel, Gomes S. N. and Chacham, Helio and Neves, Bernardo R. A. and Lacerda, Rodrigo G.} } @article {CARDOSO2018, title = {Secondary recrystallization characteristics of 3\%Si grain-oriented electrical steel}, journal = {Journal of Materials Research and Technology}, year = {2018}, keywords = {Grain-oriented steel, Magnetic properties, Secondary recrystallization}, issn = {2238-7854}, doi = {https://doi.org/10.1016/j.jmrt.2017.12.002}, url = {http://www.sciencedirect.com/science/article/pii/S2238785417301990}, author = {Afonso Vaz de Mello Cardoso and Sebasti{\~a}o da Costa Paolinelli and Carolina Cesconetto Silveira and Andr{\'e} Barros Cota} } @article {doi:10.1080/10837450.2018.1472610, title = {{\textquotedblleft}Evaluation of the losartan solubility in the biowaiver context by shake-flask method and intrinsic dissolution{\textquotedblright}}, journal = {Pharmaceutical Development and Technology}, number = {ja}, year = {2018}, note = {PMID: 29723078}, pages = {1-32}, publisher = {Taylor \& Francis}, doi = {10.1080/10837450.2018.1472610}, url = {https://doi.org/10.1080/10837450.2018.1472610}, author = {Janine Braga de Souza and Jacqueline de Souza and Lara Maria Lopes de Castro and Melissa Fab{\'\i}ola Siqueira and Ranylson Marcello Leal Savedra and Neila M{\'a}rcia Silva-Barcellos} } @article {1742-6596-1012-1-012005, title = {On the use of the energy probability distribution zeros in the study of phase transitions}, journal = {Journal of Physics: Conference Series}, volume = {1012}, number = {1}, year = {2018}, pages = {012005}, abstract = {This contribution is devoted to cover some technical aspects related to the use of the recently proposed energy probability distribution zeros in the study of phase transitions. This method is based on the partial knowledge of the partition function zeros and has been shown to be extremely efficient to precisely locate phase transition temperatures. It is based on an iterative method in such a way that the transition temperature can be approached at will. The iterative method will be detailed and some convergence issues that has been observed in its application to the 2D Ising model and to an artificial spin ice model will be shown, together with ways to circumvent them.}, url = {http://stacks.iop.org/1742-6596/1012/i=1/a=012005}, author = {L A S M{\'o}l and R G M Rodrigues and R A Stancioli and J C S Rocha and B V Costa} } @article {SARAIVA BISPO2018, title = {M{\'e}todo das Rela{\c c}{\~o}es de Recorr{\^e}ncia aplicado no problema do el{\'e}tron em campo magn{\'e}tico constante e uniforme}, journal = {Revista Brasileira de Ensino de F{\'\i}sica}, volume = {40}, year = {2018}, month = {00}, publisher = {scielo}, issn = {1806-1117}, url = {http://www.scielo.br/scielo.php?script=sci_arttext\&pid=S1806-11172018000300408\&nrm=iso}, author = {Saraiva Bispo, Luciana Caroline and Silva Nunes, Maria Eug{\^e}nia} } @article {condmat3020011, title = {Electronic Properties of Curved Few-Layers Graphene: A Geometrical Approach}, journal = {Condensed Matter}, volume = {3}, number = {2, ARTICLE NUMBER = 1}, year = {2018}, abstract = {We show the presence of non-relativistic L{\'e}vy-Leblond fermions in flat three- and four-layers graphene with AB stacking, extending the results obtained in Cariglia et al. 2017 for bilayer graphene. When the layer is curved we obtain a set of equations for Galilean fermions that are a variation of those of L{\'e}vy-Leblond with a well defined combination of pseudospin, and that admit L{\'e}vy-Leblond spinors as solutions in an approriate limit. The local energy of such Galilean fermions is sensitive to the intrinsic curvature of the surface. We discuss the relationship between two-dimensional pseudospin, labelling layer degrees of freedom, and the different energy bands. For L{\'e}vy-Leblond fermions, an interpretation is given in terms of massless fermions in an effective 4D spacetime, and in this case the pseudospin is related to four dimensional chirality. A non-zero energy band gap between conduction and valence electronic bands is obtained for surfaces with positive curvature.}, issn = {2410-3896}, doi = {10.3390/condmat3020011}, url = {http://www.mdpi.com/2410-3896/3/2/11}, author = {Cariglia, Marco and Giamb{\`o}, Roberto and Perali, Andrea} } @article {Araujo2018, title = {Electro-optical interfacial effects on a graphene/π-conjugated organic semiconductor hybrid system}, journal = {Beilstein Journal of Nanotechnology}, volume = {9}, year = {2018}, pages = {963-974}, issn = {2190-4286}, doi = {10.3762/bjnano.9.90}, author = {Araujo, Karolline A. S. and Luiz A. Cury and Matos, Matheus J. S. and Fernandes, Thales F. D. and Luiz G. Can{\c c}ado and Neves, Bernardo R. A.} } @article {deBrito2018, title = {Synthesis, crystal structure, photophysical properties and theoretical studies of a novel bis(phenylisoxazolyl) benzene derivative}, journal = {Journal of Molecular Structure}, year = {2018}, pages = {-}, abstract = {Abstract Isoxazoles have well established biological activities but, have been underexplored as synthetic intermediates for applications in materials science. The aims of this work are to synthesis a novel isoxazole and analyze its structural and photophysical properties for application in electronic organic materials. The novel bis (phenylisoxazolyl) benzene compound was synthesized in four steps and characterized by NMR, high resolution mass spectrometry, differential thermal analysis, infrared spectroscopy, cyclic voltammetry, ultraviolet{\textendash}visible spectroscopy, fluorescence spectroscopy, \DFT\ and \TDDFT\ calculations. The molecule presented optical absorption in the ultraviolet region (from 290 nm to 330 nm), with maximum absorption length centered at 306 nm. The molar extinction coefficients (ε), fluorescence emission spectra and quantum efficiencies in chloroform and dimethylformamide solution were determined. Cyclic voltammetry analysis was carried out for estimating the \HOMO\ energy level and these properties make it desirable material for photovoltaic device applications. Finally, the excited-state properties of present compound were calculated by time-dependent density functional theory (TDDFT).}, keywords = {DFT studies}, issn = {0022-2860}, doi = {https://doi.org/10.1016/j.molstruc.2018.03.009}, url = {https://www.sciencedirect.com/science/article/pii/S0022286018302862}, author = {A.C.F. de Brito and R.S. Correa and A.A. Pinto and Matos, M. J. S. and J.C. Tenorio and J.G. Taylor and T. Cazati} } @article {0957-4484-29-9-095704, title = {Universal deformation pathways and flexural hardening of nanoscale 2D-material standing folds}, journal = {Nanotechnology}, volume = {29}, number = {9}, year = {2018}, pages = {095704}, abstract = {In the present work, we use atomic force microscopy nanomanipulation of 2D-material standing folds to investigate their mechanical deformation. Using graphene, h-BN and talc nanoscale wrinkles as testbeds, universal force{\textendash}strain pathways are clearly uncovered and well-accounted for by an analytical model. Such universality further enables the investigation of each fold bending stiffness κ as a function of its characteristic height h 0 . We observe a more than tenfold increase of κ as h 0 increases in the 10{\textendash}100 nm range, with power-law behaviors of κ versus h 0 with exponents larger than unity for the three materials. This implies anomalous scaling of the mechanical responses of nano-objects made from these materials.}, url = {http://stacks.iop.org/0957-4484/29/i=9/a=095704}, author = {Chacham, Helio and Ana Paula M Barboza and Alan B de Oliveira and Camilla K de Oliveira and Ronaldo J C Batista and Bernardo R A Neves} } @article {doi:10.1021/acs.jpcc.7b09908, title = {Nanoporous Graphene and H-BN from BCN Precursors: First-Principles Calculations}, journal = {The Journal of Physical Chemistry C}, volume = {122}, number = {7}, year = {2018}, pages = {3856-3864}, doi = {10.1021/acs.jpcc.7b09908}, url = {https://doi.org/10.1021/acs.jpcc.7b09908}, author = {Dias, Rafael F. and da Rocha Martins, Jonathan and Chacham, H{\'e}lio and de Oliveira, Alan B. and Ta{\'\i}se M. Manhabosco and Batista, Ronaldo J. C.} } @article {10.1088/2053-1583/aab38c, title = {Robust nanofabrication of monolayer MoS2 islands with strong photoluminescence enhancement via local anodic oxidation.}, journal = {2D Materials}, year = {2018}, abstract = {Abstract In this work, we demonstrate the nanofabrication of monolayer MoS2 islands using local anodic oxidation of few-layer and bulk MoS2 flakes. The nanofabricated islands present true monolayer Raman signal and photoluminescence intensity up to two orders of magnitude larger than that of a pristine monolayer. This technique is robust enough to result in monolayer islands without the need of\&$\#$13; meticulously fine-tuning the oxidation process, thus providing a fast and reliable way of creating monolayer regions with enhanced optical properties and with controllable size, shape, and position.}, url = {http://iopscience.iop.org/10.1088/2053-1583/aab38c}, author = {Thales Fernando Damasceno Fernandes and Andreij Gadelha and Ana Barboza and Roberto Paniago and Leonardo Cristiano Campos and Paulo Guimaraes and Pierre Assis and Almeida Neves, Bernardo Ruegger} } @article {doi:10.1021/acs.jpcb.7b02258, title = {Lattice Model of an Ionic Liquid at an Electrified Interface}, journal = {The Journal of Physical Chemistry B}, volume = {121}, number = {26}, year = {2017}, note = {PMID: 28590756}, pages = {6408-6415}, doi = {10.1021/acs.jpcb.7b02258}, url = {https://doi.org/10.1021/acs.jpcb.7b02258}, author = {Girotto, Matheus and Colla, Thiago and Alexandre P. dos Santos and Levin, Yan} } @article {doi:10.1063/1.4990737, title = {Ionic size effects on the Poisson-Boltzmann theory}, journal = {The Journal of Chemical Physics}, volume = {147}, number = {1}, year = {2017}, pages = {014104}, doi = {10.1063/1.4990737}, url = {https://doi.org/10.1063/1.4990737}, author = {Colla, Thiago and Lucas Nunes Lopes and Alexandre P. dos Santos} } @article {SOGA2017, title = {Um microscopio caseiro simplificado}, journal = {Revista Brasileira de Ensino de F{\'\i}sica}, volume = {39}, year = {2017}, month = {00}, publisher = {scielo}, issn = {1806-1117}, url = {http://www.scielo.br/scielo.php?script=sci_arttext\&pid=S1806-11172017000400605\&nrm=iso}, author = {Soga, Diogo and Paiva Jr., Raul Dias and Ueno-Guimar{\~A}\poundses, Michele Hidemi and Muramatsu, Mikiya} } @article {LIMA2017, title = {PROPOSITOS DA DIVULGACAO CIENTIFICA NO PLANEJAMENTO DE ENSINO}, journal = {Ensaio Pesquisa em Educa{\c c}{\~a}o em Ci{\^e}ncias (Belo Horizonte)}, volume = {19}, year = {2017}, month = {00}, publisher = {scielo}, issn = {1983-2117}, url = {http://www.scielo.br/scielo.php?script=sci_arttext\&pid=S1983-21172017000100228\&nrm=iso}, author = {Lima, Guilherme da Silva and Giordan, Marcelo} } @article {doi:10.1021/acsomega.7b00061, title = {Transport Properties of Hydrogenated Cubic Boron Nitride Nanofilms with Gold Electrodes from Density Functional Theory}, journal = {ACS Omega}, volume = {2}, number = {4}, year = {2017}, pages = {1696-1701}, doi = {10.1021/acsomega.7b00061}, url = {http://dx.doi.org/10.1021/acsomega.7b00061}, author = {Moraes, Elizane E. de and Coutinho-Filho, Maur{\'\i}cio D. and Batista, Ronaldo J. C.} } @article {Batista2017, title = {A coarse-grained model based on core-oftened potentials for anomalous polymers}, journal = {Journal of Chemical Sciences}, volume = {129}, number = {7}, year = {2017}, month = {Jul}, pages = {999{\textendash}1003}, abstract = {Starting from an anomalous monomeric system, where particles interact via a two-scale core-softened potential, we investigate how the system properties evolve inasmuch as particles are put together to form polymers whose chain size varies from 4 up to 32 monomers. We observed that the density and diffusion anomaly regions in the pressure versus temperature phase diagram of the monomeric system is smaller in the monomeric system when compared with the polymers. We also found that the polymers do not fold into themselves to form solid spheres instead they tend to maximize the chain-fluid contact. Also, Rouse and Reptation models can be employed to describe the polymers diffusive behaviour. But, in contrast to results of simulations where mere interacts via Lennard-Jones potentials, our results shown a much shorter entanglement length of at most 8 monomers.}, issn = {0973-7103}, doi = {10.1007/s12039-017-1311-5}, url = {https://doi.org/10.1007/s12039-017-1311-5}, author = {Batista, Ronaldo J. C. and Torres, Evy A. Salcedo and de Oliveira, Alan Barros and Barbosa, Marcia C. B.} } @article {NICHELE201765, title = {Accurate calculation of near-critical heat capacities CP and CV of argon using molecular dynamics}, journal = {Journal of Molecular Liquids}, volume = {237}, number = {Supplement C}, year = {2017}, pages = {65 - 70}, keywords = {Argon, Heat capacities and, Molecular dynamics, Near-critical}, issn = {0167-7322}, doi = {https://doi.org/10.1016/j.molliq.2017.03.120}, url = {http://www.sciencedirect.com/science/article/pii/S0167732216332433}, author = {Jakler Nichele and de Oliveira, Alan B. and Leonardo S. de B. Alves and Itamar Borges} } @article {FERREIRA20171003, title = {Colorimetric dosimeter to promote most efficient use of neonatal phototherapy}, journal = {Sensors and Actuators B: Chemical}, volume = {240}, number = {Supplement C}, year = {2017}, pages = {1003 - 1008}, keywords = {Hyperbilirubinemia, Infant, Pediatric, Radiation sensor, Radiation therapy}, issn = {0925-4005}, doi = {https://doi.org/10.1016/j.snb.2016.06.101}, url = {http://www.sciencedirect.com/science/article/pii/S0925400516309546}, author = {G.R. Ferreira and A.M. Tannure and L.C. Cardoso and M.F. Siqueira and A.G.C. Bianchi and R.F. Bianchi} } @article {deMagalh{\~a}es2017, title = {Structural dependence of MEH-PPV chromism in solution}, journal = {Journal of Molecular Modeling}, volume = {23}, number = {3}, year = {2017}, month = {Feb}, pages = {91}, abstract = {The chromism observed in the MEH-PPV polymer in tetrahydrofuran (THF) solution is discussed as a function of the structural morphology of the backbone chains. To evaluate this phenomenon, we carried out simulations employing a hybrid methodology using molecular dynamics and quantum mechanical approaches. Our results support the hypothesis that the morphological order{\textendash}disorder transition is related to the change from red to blue phase observed experimentally. The morphological disorder is associated with total or partial twisted arrangements in the polymer backbone, which induces an electronic conjugation length more confined to shorter segments. In addition, the main band of the MEH-PPV UV{\textendash}Vis spectrum at the lower wavelength is related to the blue phase, in contrast to the red phase found for the more planar backbone chains.}, issn = {0948-5023}, doi = {10.1007/s00894-017-3239-6}, url = {https://doi.org/10.1007/s00894-017-3239-6}, author = {de Magalh{\~a}es, Carlos E. T. and Ranylson M. L. Savedra and Dias, Karina S. and Ramos, Rodrigo and Siqueira, Melissa F.} } @article {doi:10.1080/00268976.2016.1265679, title = {Anisotropic electron mobility in fluorene-PPV and fluorene-MEH-PPV}, journal = {Molecular Physics}, volume = {115}, number = {3}, year = {2017}, pages = {357-363}, publisher = {Taylor \& Francis}, doi = {10.1080/00268976.2016.1265679}, url = {http://dx.doi.org/10.1080/00268976.2016.1265679}, author = {Carlos E. T. Magalh{\~a}es and Marcio M. da Silva and Ranylson M. L. Savedra and Siqueira, Melissa F.} } @article {Rodrigues2017, title = {Zero Helicity States in the LaAlO3-SrTiO3 Interface: The Origin of the Mass Anisotropy}, journal = {Journal of Superconductivity and Novel Magnetism}, volume = {30}, number = {1}, year = {2017}, month = {Jan}, pages = {145{\textendash}150}, abstract = {We consider the transverse magnetic moment and torque observed by Li et al. (Nat. Phys. 7, 762 (2011)) in the LaAlO3/SrTiO3 interface and the theoretical model for it based on the zero helicity states. The transverse magnetic moment is explained in terms of an asymmetry between the two sides of the interface. We show here that there is an intrinsic magnetization which gives rise to a mass anisotropy in each side of the interface.}, issn = {1557-1947}, doi = {10.1007/s10948-016-3739-0}, url = {https://doi.org/10.1007/s10948-016-3739-0}, author = {Rodrigues, Edinardo I. B. and Doria, Mauro M. and Vargas-Paredes, Alfredo A. and Cariglia, Marco and Perali, Andrea} } @article {PhysRevB.95.245426, title = {Curvature-tuned electronic properties of bilayer graphene in an effective four-dimensional spacetime}, journal = {Phys. Rev. B}, volume = {95}, year = {2017}, month = {Jun}, pages = {245426}, publisher = {American Physical Society}, doi = {10.1103/PhysRevB.95.245426}, url = {https://link.aps.org/doi/10.1103/PhysRevB.95.245426}, author = {Cariglia, Marco and Giamb{\`o}, Roberto and Perali, Andrea} } @article {doi:10.1021/acs.jpcc.7b00532, title = {Edge-Reconstructed, Few-Layered Graphene Nanoribbons: Stability and Electronic Properties}, journal = {The Journal of Physical Chemistry C}, volume = {121}, number = {10}, year = {2017}, pages = {5836-5840}, doi = {10.1021/acs.jpcc.7b00532}, url = {http://dx.doi.org/10.1021/acs.jpcc.7b00532}, author = {Gon{\c c}alves, Juliana A. and Nascimento, Regiane and Matos, Matheus J. S. and de Oliveira, Alan B. and Chacham, H{\'e}lio and Batista, Ronaldo J. C.} } @article {Martins2017, title = {Raman evidence for pressure-induced formation of diamondene}, journal = {Nature Communications}, volume = {8}, number = {1}, year = {2017}, pages = {96}, abstract = {Despite the advanced stage of diamond thin-film technology, with applications ranging from superconductivity to biosensing, the realization of a stable and atomically thick two-dimensional diamond material, named here as diamondene, is still forthcoming. Adding to the outstanding properties of its bulk and thin-film counterparts, diamondene is predicted to be a ferromagnetic semiconductor with spin polarized bands. Here, we provide spectroscopic evidence for the formation of diamondene by performing Raman spectroscopy of double-layer graphene under high pressure. The results are explained in terms of a breakdown in the Kohn anomaly associated with the finite size of the remaining graphene sites surrounded by the diamondene matrix. Ab initio calculations and molecular dynamics simulations are employed to clarify the mechanism of diamondene formation, which requires two or more layers of graphene subjected to high pressures in the presence of specific chemical groups such as hydroxyl groups or hydrogens.}, issn = {2041-1723}, doi = {10.1038/s41467-017-00149-8}, url = {https://doi.org/10.1038/s41467-017-00149-8}, author = {Martins, Luiz Gustavo Pimenta and Matos, Matheus J. S. and Paschoal, Alexandre R. and Freire, Paulo T. C. and Andrade, Nadia F. and Aguiar, Acrisio L. and Kong, Jing and Neves, Bernardo R. A. and de Oliveira, Alan B. and Mazzoni, M{\'a}rio S. C. and Filho, Antonio G. Souza and Can?{\textsection}ado, Luiz Gustavo} }