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Contextual analysis of pedestrian mobility in transport terminals
Joelma C.C. e Silva,Flavio S.C. da Silva 한국통신학회 2021 ICT Express Vol.7 No.4
Data acquisition using security cameras for pedestrian tracking and counting is inherently inaccurate due to limited video quality and the dynamics of pedestrian mobility. In this article we explore how specific patterns of pedestrian behavior in transport terminals can improve accuracy in tracking and counting. We show the effectiveness of our proposed techniques using data from the New York Grand Central Station. The proposed tool improves the accuracy of pedestrian labeling based on information about the dynamics of pedestrian mobility in the specific context of transport terminals.
Marcos R da S Vieira,Luiz G M Pessoa,Walter S E Junior,Ygor H Leal,Luzia F da Silva,Rafael C Silva,Eduardo S dos Santos,Thialla L Amorim,Damina C de Medeiros 한국원예학회 2016 Horticulture, Environment, and Biotechnology Vol.57 No.2
This study aimed to assess changes in peroxidase activity and total protein content of cut flowers of Strelitzia reginae that were treated with the chemical preservatives 8-hydroxyquinoline citrate (8-HQC) or chlorine during cold storage. The bases of the cut flowers were immersed in 1.5 L of tap water with 48 h pulsing treatments (a control with no chemical preservatives (0 mg·L-1, 100 mg·L-1 chlorine, 250 mg·L-1 8-HQC or 500 mg·L-1 8-HQC) during cold storage at 10.5°C and 90% relative humidity. The solutions were then replaced with tap water and the cut flowers remained in cold storage for 12 days. For biochemical characterization of peroxidase activity and total protein content, tissue samples (sepals, petals, stems, and bracts) were collected and analyzed at 0, 4, 8, and 12 days after treatment. There was an increase in peroxidase activity in petals, stems, and bracts and a decrease in total protein content, regardless of the treatment used. In this experiment, therefore, differences in peroxidase activity and total protein content due to treatments with 8-HQC or chlorine were not identified.
Electronic structure and optical properties of BaMoO4 powders
J.C. Sczancoski,L.S. Cavalcante,N.L. Marana,R.O. da Silva,R.L. Tranquilin,M.R. Joya,P.S. Pizani,J.A. Varela,J.R. Sambrano,M. Siu Li,E. Longo,J. Andrés 한국물리학회 2010 Current Applied Physics Vol.10 No.2
Barium molybdate (BaMoO4) powders were synthesized by the co-precipitation method and processed in microwave-hydrothermal at 140 ℃ for different times. These powders were characterized by X-ray diffraction (XRD), Fourier transform Raman (FT-Raman), Fourier transform infrared (FT-IR), ultraviolet–visible (UV–vis) absorption spectroscopies and photoluminescence (PL) measurements. XRD patterns and FT-Raman spectra showed that these powders present a scheelite-type tetragonal structure without the presence of deleterious phases. FT-IR spectra exhibited a large absorption band situated at around 850.4 cm1, which is associated to the Mo–O antisymmetric stretching vibrations into the [MoO4] clusters. UV–vis absorption spectra indicated a reduction in the intermediary energy levels within band gap with the processing time evolution. First-principles quantum mechanical calculations based on the density functional theory were employed in order to understand the electronic structure (band structure and density of states) of this material. The powders when excited with different wavelengths (350 nm and 488 nm) presented variations. This phenomenon was explained through a model based in the presence of intermediary energy levels (deep and shallow holes) within the band gap.
V. Dias da Silva,C.C. Ferreira,M.H.F.M. Barros,E.N.B.S. Julio 사단법인 한국계산역학회 2009 Computers and Concrete, An International Journal Vol.6 No.6
The analysis of prismatic members made of reinforced concrete under inclined bending, especially the computation of ultimate loads, is a pronounced non-linear problem which is frequently solved by discretizing the stress distribution in the cross-section using interpolation functions. In the approach described in the present contribution the exact analytical stress distribution is used instead. The obtained expressions are integrated by means of a symbolic manipulation package and automatically converted to optimized Fortran code. The direct problem-computation of ultimate internal forces given the position of the neutral axis-is first described. Subsequently, two kinds of inverse problem are treated: the computation of rupture envelops and the dimensioning of reinforcement, given design internal forces. An iterative Newton-Raphson procedure is used. Examples are presented.
LEGACY EXTRAGALACTIC UV SURVEY (LEGUS) WITH THE<i>HUBBLE SPACE TELESCOPE</i>. I. SURVEY DESCRIPTION
Calzetti, D.,Lee, J. C.,Sabbi, E.,Adamo, A.,Smith, L. J.,Andrews, J. E.,Ubeda, L.,Bright, S. N.,Thilker, D.,Aloisi, A.,Brown, T. M.,Chandar, R.,Christian, C.,Cignoni, M.,Clayton, G. C.,Silva, R. da,Mi IOP Publishing 2015 The Astronomical journal Vol.149 No.2
Electronic excitations in molecular solids: bridging theory and experiment
Skelton, Jonathan M.,Lora da Silva, E.,Crespo-Otero, Rachel,Hatcher, Lauren E.,Raithby, Paul R.,Parker, Stephen C.,Walsh, Aron The Royal Society of Chemistry 2015 Faraday discussions Vol.177 No.-
<P>As the spatial and temporal resolution accessible to experiment and theory converge, computational chemistry is an increasingly powerful tool for modelling and interpreting spectroscopic data. However, the study of molecular processes, in particular those related to electronic excitations (<I>e.g.</I> photochemistry), frequently pushes quantum-chemical techniques to their limit. The disparity in the level of theory accessible to periodic and molecular calculations presents a significant challenge when modelling molecular crystals, since accurate calculations require a high level of theory to describe the molecular species, but must also take into account the influence of the crystalline environment on their properties. In this article, we briefly review the different classes of quantum-chemical techniques, and present an overview of methods that account for environmental influences with varying levels of approximation. Using a combination of solid-state and molecular calculations, we quantitatively evaluate the performance of implicit-solvent models for the [Ni(Et<SUB>4</SUB>dien)(η<SUP>2</SUP>-O,ON)(η<SUP>1</SUP>-NO<SUB>2</SUB>)] linkage-isomer system as a test case. We focus particularly on the accurate reproduction of the energetics of the isomerisation, and on predicting spectroscopic properties to compare with experimental results. This work illustrates how the synergy between periodic and molecular calculations can be exploited for the study of molecular crystals, and forms a basis for the investigation of more challenging phenomena, such as excited-state dynamics, and for further methodological developments.</P>
Microencapsulation of Antibiotic Rifampicin in Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)
Duran, N.,Alvarenga, M.A.,Da Silva, E.C.,Melo, P.S.,Marcato, P.D. 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.11
The aim of this study was the preparation of microparticles containing rifampicin using a biodegradable polymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate) for oral administration produced by a bacteria. The poly(3-hydroxybutyrate-co-3-hydroxyvalerate) microparticles with and without rifampicin were prepared by the emulsification and solvent evaporation method, in which chloroform and polyvinyl alcohol are used as the solvent and emulsifier, respectively. Microparticles were obtained within a size range of $20-60{\mu}m$ by changing the initial poly(3-hydroxybutyrate-co-3-hydroxyvalerate), polyvinyl alcohol and rifampicin concentrations. An encapsulation efficiency value of 14% was obtained. The optimized total yield of 60% of the poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/ rifampicin was obtained. A load of 0.035 mg/1mg of PHBV was reached. Almost 90% of the drug loaded in the micro-particles was released after 24 h. The size, encapsulation efficiency and ribampicin release of the micro-particles varied as a function of the initial poly(3-hydroxybutyrate-co-3-hydroxyvalerate), polyvinyl alcohol and rifampicin concentrations. It was demonstrated that the microencapsulated rifampicin, although was not totally available in the medium, exhibited a similar inhibition value as free rifampicin at 24 h of incubation with S. aureus. Cytotoxicity assays demonstrated a reduction of the toxicity when rifampicin was microencapsulated in poly(3-hydroxybutyrate-co-3-hydroxyvalerate) while maintaining its antibacterial activity.
Microencapsulation of Antibiotic Rifampicin in Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)
N.Duran,M.A. Alvarenga,E.C. Da Silva,P.S. Melo,P.D. Marcato 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.11
The aim of this study was the preparation of microparticles containing rifampicin using a biodegradable polymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate) for oral administration produced by a bacteria. The poly(3-hydroxybutyrate-co-3-hydroxyvalerate) microparticles with and without rifampicin were prepared by the emulsification and solvent evaporation method, in which chloroform and polyvinyl alcohol are used as the solvent and emulsifier, respectively. Microparticles were obtained within a size range of 20-60 μm by changing the initial poly(3-hydroxybutyrate-co-3-hydroxyvalerate), polyvinyl alcohol and rifampicin concentrations. An encapsulation efficiency value of 14% was obtained. The optimized total yield of 60% of the poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/ rifampicin was obtained. A load of 0.035 mg/1 mg of PHBV was reached. Almost 90% of the drug loaded in the microparticles was released after 24 h. The size, encapsulation efficiency and ribampicin release of the microparticles varied as a function of the initial poly(3-hydroxybutyrate-co-3-hydroxyvalerate), polyvinyl alcohol and rifampicin concentrations. It was demonstrated that the microencapsulated rifampicin, although was not totally available in the medium, exhibited a similar inhibition value as free rifampicin at 24 h of incubation with S. aureus. Cytotoxicity assays demonstrated a reduction of the toxicity when rifampicin was microencapsulated in poly(3-hydroxybutyrate-co-3-hydroxyvalerate) while maintaining its antibacterial activity.
Oxidative Stress in the Heart of Rats Infected with Trypanosoma evansi
Matheus D. Baldissera,Carine de F. Souza,Claudia M. Bertoncheli,Karine L. da Silveira,Thirssa H. Grando,Bianca C. Z. Porto,Daniela B. R. Leal,Aleksandro S. Da Silva,Ricardo E. Mendes,Lenita M. Stefani 대한기생충학열대의학회 2016 The Korean Journal of Parasitology Vol.54 No.3