Influence of 3D microstructure for improving the thermal performance of building façades

The thermal performance of a building is highly dependent on the heat transmission through the envelope. On the other hand, additive manufacturing has been increasingly used in several industrial applications due to its possibility to produce complex structures. However, most studies of the 3d printing process focused on mechanical performance. This study aims to evaluate how the internal 3D-printed microstructure affects thermal performance. Twelve infill patterns were analysed, including Gyroid, Grid, Hilbert curve, Line, Rectilinear, Stars Triangles, 3D Honeycomb, Honeycomb, Concentric, Cubic, and Octagram spiral. Using fused deposition modelling (FDM), the samples were printed with polyethene terephthalate-glycol (PET-G) thermoplastic filaments. Thermal tests were conducted using a calibrated hotbox, following the recommendations of ASTM C1363-11:2014. The results obtained show a variation of 70% by changing the internal microstructure using fix infill density of 25%. Concentric, Gyroid and Hilbert curve achieved the best thermal insulation properties.The authors would like to acknowledge the financial support granted by NORTE-45-2020-75. The contribution of the work of Paulo Renato Quintas during the analysis and development of the analysed specimens, and the technical support of Prof. Ricardo Mateus, Adilson Junior and Lívia Cosentino during the hotbox experiments

Overview of machine learning methods for Android malware identification

Mobile malware is growing and affecting more and more mobile users around the world. Malicious developers and organisations are disguising their malware payloads on apparently benign applications and pushing them to large app stores, such as Google Play Store, and from there to final users. App stores are currently losing the battle against malicious applications proliferation and existing malware. Detection methods based on signatures, such as those of an antivirus, are limited, new approaches based on machine learning start to be explored to surpass the limitations of traditional mobile malware detection methods, analysing not only static characteristics of the app but also its behaviour. This paper contains an overview of the existing machine learning mobile malware detection approaches based on static, dynamic and hybrid analysis, presenting the advantages and limitations of each, and a comparison between the reviewed methods.info:eu-repo/semantics/acceptedVersio

Ensinando construtivamente conceitos de eletrostática seguindo um planejamento previsto.

Os currículos oficiais para as disciplinas de física nas séries do ensino médio\ud trazem em geral sequências definidas e cada vez mais detalhadas quanto ao\ud desenvolvimento na sala de aula. Por outro lado, os mesmos documentos oficiais que tratam\ud dos objetivos formativos e educativos do ensino de ciências, em particular da física,\ud propõem que devem ser utilizados procedimentos e estratégias na sala de aula, que\ud considerem o aprendiz como foco do ensino; isto levaria a tratar o aluno como protagonista\ud de sua aprendizagem. Para os professores, as duas ideias parecem contraditórias: como\ud planejar um conteúdo a ser ensinado e também acompanhar o pensamento expresso pelo\ud aluno? A exigência sobre a capacitação do professor é muito grande para que ele consiga\ud movimentar-se dentro dessa situação para ele conflituosa. Mas é possível tratar os\ud conteúdos disciplinares partindo de uma questão geradora pelos alunos. Apresentamos um\ud trabalho de uma professora de física da rede pública do estado de São Paulo com alunos do\ud terceiro ano do ensino médio, relacionado à eletrostática. A professora planejou discutir os\ud conceitos fundamentais a partir de atividades experimentais, incentivando a observação\ud criteriosa e a análise de medidas, registros e organização dos resultados através de\ud representações, para discutir os conteúdos facilitando o pensar na ação. Um tema-gerador\ud ‘raio’ perpassa toda a sequência, resultando na participação e aprendizagem dos alunos

Energy-lowering and constant-energy spin flips : emergence of the percolating cluster in the kinetic Ising model

After a sudden quench from the disordered high-temperature T0 → ∞ phase to a final temperature well below the critical point TF Tc, the nonconserved order parameter dynamics of the two-dimensional ferromagnetic Ising model on a square lattice initially approaches the critical percolation state before entering the coarsening regime. This approach involves two timescales associated with the first appearance (at time tp1 > 0) and stabilization (at time tp > tp1 ) of a giant percolation cluster, as previously reported. However, the microscopic mechanisms that control such timescales are not yet fully understood. In this paper, to study their role on each time regime after the quench (TF = 0), we distinguish between spin flips that decrease the total energy of the system from those that keep it constant, the latter being parametrized by the probability p. We show that observables such as the cluster size heterogeneity H(t, p) and the typical domain size (t, p) have no dependence on p in the first time regime up to tp1 . Furthermore, when energy-decreasing flips are forbidden while allowing constant-energy flips, the kinetics is essentially frozen after the quench and there is no percolation event whatsoever. Taken together, these results indicate that the emergence of the first percolating cluster at tp1 is completely driven by energy decreasing flips. However, the time for stabilizing a percolating cluster is controlled by the acceptance probability of constant-energy flips: tp(p) ∼ p−1 for p 1 (at p = 0, the dynamics gets stuck in a metastable state). These flips are also the relevant ones in the later coarsening regime where dynamical scaling takes place. Because the phenomenology on the approach to the percolation point seems to be shared by many 2D systems with a nonconserved order parameter dynamics (and certain cases of conserved ones as well), our results may suggest a simple and eff Because the phenomenology on the approach to the percolation point seems to be shared by many 2D systems with a nonconserved order parameter dynamics (and certain cases of conserved ones as well), our results may suggest a simple and effective way to set, through the dynamics itself, tp1 and tp in such systems

PROFESSORES E FORMADORES NA FORMAÇÃO CONTÍNUA (atores e diretores na construção de um personagem)

Nossa realidade mostra que o resultado do investimento na Formação Contínua de Professores não tem sido satisfatório; o professor continua sem condições de avançar por conta própria, para melhorar a sua prática, pesquisando acervos de material didático e enfrentando questões vividas no cotidiano. Nesse ambiente o professor não tem conseguido efetivamente aprender, sendo capaz de incluir novidades no seu planejamento e levá-las para  a sala de aula. Esse cenário, em que as práticas de sala de aula são tão paradigmaticamente diferentes dos discursos sobre o ensino e a aprendizagem, sugere que os programas de Formação Contínua trabalhem com problemas próprios do professor, autenticamente gerados por ele, para tornar possível uma transposição para a sala de aula. Este trabalho procura fazer uma analogia entre a formação contínua e a construção de personagens no teatro e sugere que nessa construção a pessoa plena do professor e sua atuação profissional sejam consideradas

Quantitative structure-activity relationships (QSAR) studies of bisbenzamidines with antifungal activity

This paper describes 2D-QSAR and 3D-QSAR studies against Candida albicans and Cryptococcus neofarmans for a set of 20 bisbenzamidines. In the studies of 2D-QSAR with C. albicans it was obtained a correlation between log MIC-1 and lipolo component-Z (r² = 0.68; Q² = 0.51). In the case of C. neofarmans a correlation between log MIC-1 and lipolo component-Z and of Balaban index (r² = 0.85; Q² = 0.6) was obtained. 3D-QSAR studies using CoMFA showed that the steric fields contributed more to the predicted activities for Candida albicans (94.9%) and Cryptococcus neofarmans (97.9%).FAPEMIGCoordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)CNP

LATTES: a novel detector concept for a gamma-ray experiment in the Southern hemisphere

The Large Array Telescope for Tracking Energetic Sources (LATTES), is a novel concept for an array of hybrid EAS array detectors, composed of a Resistive Plate Counter array coupled to a Water Cherenkov Detector, planned to cover gamma rays from less than 100 GeV up to 100 TeVs. This experiment, to be installed at high altitude in South America, could cover the existing gap in sensitivity between satellite and ground arrays. The low energy threshold, large duty cycle and wide field of view of LATTES makes it a powerful tool to detect transient phenomena and perform long term observations of variable sources. Moreover, given its characteristics, it would be fully complementary to the planned Cherenkov Telescope Array (CTA) as it would be able to issue alerts. In this talk, a description of its main features and capabilities, as well as results on its expected performance, and sensitivity, will be presented.Comment: Proceedings of the 35th International Cosmic Ray Conference (ICRC2017), Busan, South Korea. Presented by R. Concei\c{c}\~{a}o. 8 pages; v2: correct affiliation + journal referenc

O capital social nas relações sociais de agricultores parceiros dos projetos Tipitamba e Raízes da Terra, no Nordeste Paraense.

Este trabalho teve como objetivo analisar o capital social em comunidades rurais do nordeste paraense. As ferramentas utilizadas para coleta de dados foram: o Questionário Integrado para Medir Capital Social ? QI MCS e entrevistas semi-estruturadas a partir QI MCS composto de perguntas abertas e fechadas. Dos 32 agricultores entrevistados 100% fazem parte da associação e dos projetos Tipitamba e Raízes da Terra, porém 44% destes agricultores participam de outros diferentes grupos dentre os quais destacamos: futebol, igreja, mutirão, conselho escolar, associação de meliponicultores de Igarapé Açu, grupo de agricultor São Sebastião e horta orgânica. Quanto à participação dos agricultores parceiros ou membros de sua família nas atividades em grupo, as mais citadas foram: reuniões na associação, intercâmbio, mutirão, dia de campo. Os dados apontam que os agricultores das comunidades São João, Novo Brasil e Aparecida participam mais de grupos que os agricultores de Nova Olinda e Nossa Senhora do Rosário. Os agricultores das comunidades de São João, Nova Olinda e Novo Brasil e Aparecida são os que melhor interagem interna e externamente a comunidade, porque participam mais das reuniões das associações, dos dias de campo e dos intercâmbios

Susceptibility of Alphitobius diaperinus (Panzer) (Coleoptera, Tenebrionidae) to cypermethrin, dichlorvos and triflumuron in southern Brazil.

Susceptibility of Alphitobius diaperinus (Panzer) (Coleoptera, Tenebrionidae) to cypermethrin, dichlorvos and triflumuron in southern Brazil. The lesser mealworm, Alphitobius diaperinus (Panzer), is an important insect pest in poultry houses in Brazil. Susceptibility of the lesser mealworm collected from eight poultry houses in Paraná state, southern Brazil, was evaluated for cypermethrin, dichlorvos and triflumuron. Adult A. diaperinus were tested in bioassays with cypermethrin and dichlorvos. Larvae were fed rabbit feed wetted with a triflumuron-water solution. Concentration-mortality regressions were estimated using Probit analysis and resistance ratios were calculated based on the susceptible population. Among the field populations evaluated, cypermethrin LC50 values for adults, ranged from 68.1 to 6,263 ng (AI)/cm2. LC50 values for adults challenged with dichlorvos ranged from 10.3 to 1,385 ng (AI)/cm2. One population from Pato Branco showed reduced susceptibility to triflumuron (LC50 = 272 ?g (AI)/ml of solution) when compared to the most susceptible population (LC50 = 109.8 ?g (AI)/ml). Application of cypermethrin and dichlorvos analogues should be managed with caution to minimize insecticide resistance problems. Suscetibilidade de Alphitobius diaperinus (Panzer) (Coleoptera, Tenebrionidae) a cipermetrina, diclorvós e triflumurom no sul do Brasil. O cascudinho, Alphitobius diaperinus (Panzer), é uma importante praga em aviários no Brasil. A suscetibilidade do cascudinho à cipermetrina, diclorvós e triflumurom foi avaliada em oito aviários do Estado do Paraná, Brasil. Adultos de A. diaperinus foram testados mediante bioensaios com cipermetrina e diclorvós. As larvas foram alimentadas com ração para coelhos impregnada com suspensões de triflumurom. As regressões de concentração-mortalidade foram estimadas usando análise de Probit e as razões de resistência calculadas com base na população suscetível. Entre as populações de campo avaliadas, os valores da CL50 para adultos tratados com cipermetrina variaram entre 68,1 to 6.263 ng (IA)/cm2. Os valores da CL50 para adultos tratados com diclorvós variaram de 10,3 to 1.385 ng (IA)/cm2. Uma população de Pato Branco apresentou reduzida suscetibilidade ao triflumurom (CL50 = 272 ?g (IA)/ml), quando comparada à população mais suscetível (CL50 = 109,8 ?g (IA)/ml de solução). Cipermetrina, diclorvós e análogos devem ser manejados e aplicados com cautela para minimizar os problemas de resistência a inseticidas

Natural illumination availability in Ponte de Pedra apartment block: a case study

This paper presents the results of the in-situ measurements of the natural illumination availability in the Ponte da Pedra apartments block, These measurements were carried out in order to meet the SHE (Sustainable [lousing in Europe) project requirements, This paper also presents a comparative analysis of the natural illumination environmental conditions of one of the apartments in this building, by using two simulation tools to predict natural illumination availability: "Ecotect" and "Desktop Radiance", The results obtained with these tools were also compared with the "in situ" measurements, in order to show that simple and user-friendly software tools can be a good basis to evaluate the real natural illumination conditions in the practise of a building project