bluuebunny/crossref_metadata_2025_split huggingface dataset:
Estudo dos múltiplos e divisores por meio de resolução de problemas: um relato de experiência docente
Authors: Jesuz Danilo Augusto Ferreira de , Pereira Ana Lúcia 
Published: January 2019

Resumo: O presente artigo relata uma experiência realizada por um dos autores referente ao ensino de múltiplos, divisores, números primos e quadrados perfeitos em uma turma do sétimo ano do ensino fundamental em uma escola pública do município de Siqueira Campos, PR. As tarefas desenvolvidas foram baseadas no modelo de Resolução de Problemas proposto por Polya, em que os alunos são estimulados a participarem ativamente no processo de aprendizagem. A principal lição extraída dessa experiência foi a efetividade desse método em aprimorar o raciocínio lógico e a criatividade entre os alunos, além de aprimorar a capacidade dos mesmos em trabalhar em grupo para resolver problemas mais desafiadores.Palavras-chave: Múltiplos; Divisores; Relato de experiência; Resolução de Problemas. Study of multiples and divisors by using the problem solving approach: report of a teaching experienceAbstract: The present article reports an experience carried out by one of the authors on teaching multiples, divisors, prime numbers and perfect squares to a 7th year class of the fundamental level in a public school in the City of Siqueira Campos, State of Parana, Brazil. The developed activities were based on the Polya’s model of problem solving, in which the pupils are stimulated to participate actively in the learning process. The main lesson drawn from this experience was the effectiveness of this method in fostering the logical reasoning and creativity among the pupils, as well as in fostering their ability to work in group to solve more challenging problems.Keywords: Multiples; Dividers; Exploratory Teaching; Problem Solving.
Um modelo teórico da Matemática para o ensino do conceito de variável a partir das diretrizes curriculares da educação básica do Brasil e da Colômbia
Authors: Gómez Olmar Arley , Barbosa Jonei 
Published: January 2019

Resumo: Neste estudo, apresentamos um modelo teórico da Matemática para o Ensino do conceito de variável. Esta estrutura teórica discute como pode ser apresentada a variável na atividade escolar, e categoriza as diferentes situações em que aparece esse conceito no ensino da matemática. A estratégia metodológica adotada foi uma análise documental, cujas fontes são as diretrizes curriculares da Matemática do Brasil e da Colômbia. Ao final, estruturamos seis categorias: na primeira estudamos a variável como quantidade incógnita ou indeterminada; na segunda, nos referimos à variável na relação funcional; na terceira categoria, a variável é estudada como marcador de posição para definir narrativas associadas a sistemas numéricos ou para parametrizar rotinas matemáticas; na quarta categoria, a variável é analisada como nomenclatura no estudo da medida; na quinta, apresentamos a variável como nome de uma coleção de elementos; e na sexta e última categoria, descrevemos a variável como nome de figuras geométricas. Este modelo pode subsidiar pesquisas que focalizem o ensino do conceito de variável, assim como no trabalho de delineadores de materiais didáticos e na formação de professores.Palavras-chave: Discurso; Realização; Conceito; Matemáticas para o Ensino; Variável. A theoretical model of the Mathematics for teaching of the concept of variable from official curricular guidelines for Mathematics in Brazil and ColombiaAbstract: In this study, we present a theoretical model for Mathematics for Teaching of the concept of variable. This theoretical structure discusses how the variable is presented in the school activities, and categorizes the different situations in which this concept appears in the teaching of mathematics. The methodological strategy adopted was a documentary analysis, whose sources are the curricular guidelines for Mathematics in Brazil and Colombia. In the end, we chose six categories: in the first category, we study the variable as an unknown or indeterminate quantity; in the second, we refer to the variable in a functional relationship; in the third category, the variable is studied as a placeholder to define narratives associated with numerical systems or to parameterize mathematical routines; in the fourth category, the variable is analyzed as nomenclature in measurement studies; in the fifth, we present the variable as the name of a collection of elements; and in the sixth and last category, we describe the variable as the name of geometric figures. This model can support research that focuses on the teaching of the concept of variable, as well as on the work of educational material designers and for teacher training.Keywords: Discourse; Realization; Concept; Mathematics for Teaching; Variable.
Gênero no ensino de Ciências publicações em periódicos no Brasil: o estado do conhecimento
Authors: Heerdt Bettina , Santos Ana Paula Oliveira dos , Bruel Andréa Do Carmo Bruel De Oliveira , Ferreira Fernanda Mendes , Anjos Mariane Dos Anjos Caroline dos , Swiech Mayara Juliane , Banckes Tayna 
Published: January 2019

Resumo: O artigo tem por objetivo realizar uma análise das pesquisas em Gênero e Educação Científica em todas as revistas nacionais de Ensino de Ciências e/ou Educação dos estratos A1, A2 e B1 no período de 2008 a 2018. Foram elaboradas oito unidades de registro (UR) para análise: Gênero e materiais didáticos; Gênero e inferências de interpretação; Gênero e estudos teóricos; Gênero, práticas e formação de professores; Gênero e a participação da Mulher na Ciência; Gênero e intervenções escolares; Gênero e Ciência na Mídia e Gênero e aprendizagem de Ciências, e após a análise dos artigos foi necessária à elaboração de duas UR emergentes: Interações/percepções em aulas de Ciências e Gênero e produção científica. Foram encontrados 34 artigos em 22 revistas, das 90 revistas investigadas. As pesquisas em Gênero, Ciência e Educação Científica precisam ser ampliadas e aprofundadas para que tenhamos a possibilidade de um ensino mais equânime para meninos e meninas.Palavras-chave: Educação Científica; Gênero e Ciência; Ensino de Ciências. Gender in the teaching of Science publications in journals in Brazil: the state of knowldegeAbstract: The article aims to carry out an analysis of the research on Gender and Scientific Education in all national journals of Science Teaching and/or Education of the strata A1, A2 and B1 in the period from 2008 to 2018. Eight record units (RUs) for analysis were elaborated: Gender and didactic materials; Gender and interpretation inferences ; Gender and theoretical studies; Gender, Teachers’ practices and training ; Gender and the women’s participation of in Science; Gender and school interventions; Gender and Science in the Media and Gender and Science Learning, and after the articles analysis it was necessary to draw up two emerging RUs: Interactions/perceptions in Science lessons and Gender and scientific production. 34 articles were found in 22 journals of the 90 investigated journals. Papers on Gender, Science and Scientific Education must be broadened and deepened so that we have the possibility of a more equitable education for boys and girls.Keywords: Scientific Education; Gender and Science; Science Teaching.
Proposição de ações metodológicas para inserção das dimensões de equidade nas aulas de Matemática
Authors: Farias José Airton Fernandes , Dos Santos Rodiney Marcelo Braga 
Published: January 2019

Resumo: Esta pesquisa destaca aspectos da equidade que surgem diante das dificuldades encontradas nas aulas de Matemática. As vivências e oportunidades adquiridas pelo aluno de intercâmbio são ilimitadas. Assim, optamos por apresentar o estudo preliminar de uma pesquisa de verão, realizada na Michigan StateUniversity (MSU), no estado de Michigan, EUA, que consiste no desenvolvimento de uma ferramenta, Equity Quantified In Participation (EQUIP), capaz de quantificar a participação dos alunos nas aulas de Matemática.O tratamento metodológico adotado compreende uma tipologia de abordagem qualitativa e exploratória que contribuiu para o esclarecimento de questões ligadas a equidade nas aulas de Matemática, tendo por base a observação participante a partir de um intercâmbio internacional.Contudo, contribuiu para a elaboração de uma proposição de ações metodológicas através das dimensões de equidade nas aulas de Matemática, que tem o intuito de auxiliar nas pesquisas e práticas matemáticas.Palavras-chave: Acesso; Realização; Identidade; Poder. Proposition of methodological actions for inserting equity dimensions in MathematicsAbstract: This research highlights aspects of equity that arise in the face of difficulties encountered in Mathematics classes. The experiences and opportunities acquired by the exchange student are unlimited. Thus, we chose to present the preliminary study of a summer survey, conducted at Michigan State University (MSU), Michigan, USA, which consists of the development of a tool, Equity Quantified In Participation (EQUIP), able to quantify the participation in mathematics classes. The methodological approach adopted includes a typology of a qualitative and exploratory approach that contributed to the clarification of issues related to equity in Mathematics classes, based on participant observation from an international exchange.However, he contributed to the elaboration of a proposition of methodological actions through the dimensions of equity in Mathematics classes, which aims to assist in mathematical research and practice.Keywords: Access; Achievement; Identity; Power.
GERAÇÃO Y: COMO ATRAIR E RETER?
Authors: Radech de Lima Kamilla , Lucas dos Santos Geneia 
Published: January 2019

A geração Y, também conhecida por geração do milênio, é representada por indivíduos nascidos entre os anos de 1980 e 1995. Caracterizada pela velocidade de acesso às informações e intimidade com os meios tecnológicos, essa geração possui uma nova visão em relação ao trabalho e, por consequência, novas expectativas. Diante disso, surge a necessidade de adaptar a gestão das empresas de maneira que se torne possível a atração, desenvolvimento e retenção desses profissionais dentro das organizações. Neste sentido, o estudo tem como objetivo identificar as características da geração Y, bem como os fatores que promovem a sua satisfação, motivação e permanência no emprego. Para que fosse possível atingir os objetivos propostos, elaborou-se uma pesquisa de caráter exploratório e descritivo que fora aplicada por meio de questionário fechado veiculado por meio de redes sociais. Os resultados obtidos demonstraram que a geração Y é movida por desafios, demonstra grande interesse em adquirir novos conhecimentos e espera reconhecimento, credibilidade e crescimento profissional dentro das organizações.Palavras-Chave: Geração Y. Comportamento. Gestão de pessoas. Abstract: The generation Y, also known by generation of the millennium, is represented by individuals born between the years of 1980 and 1995. Characterized by the speed of access to information and intimacy with technological means, this generation has a new vision in relation to work and, consequently, new expectations. Faced with this, there is a need to adapt the management of companies in a way that makes it possible to attract, develop and retain these professionals within organizations. In this sense, the research aims to identify the characteristics of generation Y, as well as the factors that promote their satisfaction, motivation and permanence in employment. In order to achieve the proposed objectives, an exploratory and descriptive research was developed and applied through a closed questionnaire carried out through social networks. The results show that the Y generation is driven by challenges, shows great interest in acquiring new knowledge and expects recognition, credibility and professional growth in organizations.Keywords: Generation Y. Behavior. People management.
LOGÍSTICA APLICADA NO PROCESSO DE PRODUÇÃO DE OVOS COMERCIAIS
Authors: Detofol Daiana Fátima , Rauta Jamir , Winck César Augustus 
Published: January 2019

O presente estudo refere-se à logística aplicada em uma empresa Avícola, produtora de ovos comerciais, e tem por objetivo principal propor melhorias no processo logístico de armazenamento e transporte de ovos in natura. A logística é área estratégica nas organizações, sendo indiferente o ramo de atuação desta, responsabilizando-se por processos de armazenamento, estocagem, movimentação e transporte. A cadeia de suprimentos visa garantir operações seguras e integradas à gestão estratégica e planejada, de modo a gerar redução de custos, tempo e desperdícios, buscando o aumento da rentabilidade. Empregou-se no estudo, a metodologia exploratória, em forma de estudo de caso por meio de observação, aplicação de questionário semiestruturado, e consequente estratificação e análise das informações obtidas. Conclui-se que em todo o processo de movimentação da empresa estudada, há a possibilidade de promover mudanças, desde que, ocorra a utilização de técnicas corretas de logística, alvejando assim, a obtenção de progresso no processo, como: redução do tempo destinado às atividades e da mão de obra, e melhoria da satisfação dos colaboradores. Os resultados obtidos reforçam a necessidade de melhorar a gestão dos recursos no processo produtivo, para que se consiga a obtenção de produto final com a qualidade desejada pelo mercado.Palavras-Chave: Estratégia. Competitividade. Agronegócios. Avicultura. Abstract: The present study refers to the logistics applied in a poultry company, commercial egg producer, and its main objective is to propose improvements in the logistic process of storage and transportation of eggs in natura. Logistics is a strategic area in organizations, being indifferent its branch of activity, being responsible for processes of storage, storage, movement and transportation. The supply chain aims to guarantee safe and integrated operations to the strategic and planned management, in order to generate reduction of costs, time and waste, seeking the increase of profitability. The exploratory methodology was used in the study, in the form of a case study through observation, application of a semi-structured questionnaire, and consequent stratification and analysis of the information obtained. It is concluded that in all the process of movement of the studied company, it is possible to promote changes, provided that, the use of correct logistics techniques occurs, thus targeting the achievement of progress in the process, such as: activities and the workforce, and improving employee satisfaction. The results obtained reinforce the need to improve the management of resources in the production process, so that the final product can be obtained with the quality desired by the market.Keywords: Strategy. Competitiveness. Agribusiness. Poultry farming.
APLIKASI TEKNOLOGI DIELECTRIC BARRIER DISCHARGE-UV PLASMA TERHADAP SIFAT FISIK DAN KIMIA TELUR AYAM (Gallus gallus domesticus)
Authors: Widyastuti Endrika , Daydeva Aldila 
Published: January 2019

Eggs are food that contains high nutrition, however egg products susceptible damage so preservation process is required. Dielectric Barrier Discharge (DBD) UV Plasma has proven very effective as an alternative technology to preserve fresh egg by inactivation bacteria and prevent contamination in a fresh egg. the aim of this study is to evaluated effect of Dielectric Barrier Discharge (DBD) UV Plasma on physical and chemical quality of chicken eggs (Gallus gallus domesticus). The fresh eggs were stored at room temperature and assessed for their Physical (Haugh unit and yolk index) and chemical properties (yolk pH, albumen pH, and egg nutrition) on 0, 5, 7, 11, and 14 days. Analysis of variance (ANOVA) was used to analyze significant difference among the samples. The result shows that DBD UV plasma can maintain haugh unit, yolk index, yolk pH, and albumen pH than control. The eggs treated with DBD UV recorded have no significant difference for egg nutrition.
First Resolution of Microlensed Images*
Authors: Dong Subo , Mérand A. , Delplancke-Ströbele F. , Gould Andrew , Chen Ping , Post R. , Kochanek C. S. , Stanek K. Z. , Christie G. W. , Mutel Robert , Natusch T. , Holoien T. W.-S. , Prieto J. L. , Shappee B. J. , Thompson Todd A. 
Published: January 2019

Abstract
We employ Very Large Telescope Interferometer GRAVITY to resolve, for the first time, the two images generated by a gravitational microlens. The measurements of the image separation

mas, and hence the Einstein radius θ
E = 1.87 ± 0.03 mas, are precise. This demonstrates the robustness of the method, provided that the source is bright enough for GRAVITY (K ≲ 10.5) and the image separation is of order of or larger than the fringe spacing. When θ
E is combined with a measurement of the “microlens parallax”

, the two will together yield the lens mass and lens–source relative parallax and proper motion. Because the source parallax and proper motion are well measured by Gaia, this means that the lens characteristics will be fully determined, whether or not it proves to be luminous. This method can be a powerful probe of dark, isolated objects, which are otherwise quite difficult to identify, much less characterize. Our measurement contradicts Einstein’s prediction that “the luminous circle [i.e., microlensed image] cannot be distinguished” from a star.
Particle-in-cell and Weak Turbulence Simulations of Plasma Emission
Authors: Lee Sang-Yun , Ziebell L. F. , Yoon P. H. , Gaelzer R. , Lee E. S. 
Published: January 2019

Abstract
The plasma emission process, which is the mechanism for solar type II and type III radio burst phenomena, is studied by means of particle-in-cell (PIC) and weak turbulence (WT) simulation methods. “Plasma emission” is meant as a loose description of a series of processes, starting from the solar flare-associated electron beam exciting Langmuir and ion-acoustic turbulence, and subsequent partial conversion of beam energy into radiation energy by nonlinear processes. PIC simulation is rigorous but the method is computationally intense, and it is difficult to diagnose the results. The numerical solution of equations of WT theory, known as WT simulation, on the other hand, is efficient and naturally lends itself to diagnostics because various terms in the equation can be turned on or off. Nevertheless, WT theory is based upon a number of assumptions. It is therefore desirable to compare the two methods, which we do for the first time with numerical solutions of the complete set of equations of WT theory and a two-dimensional electromagnetic PIC simulation. Upon making quantitative comparisons, it is found that WT theory is largely valid, although some discrepancies are also found. The present study also indicates that large computational resources are required in order to accurately simulate the radiation emission processes, especially for low electron beam speeds, such that it may be more advantageous to employ the WT method in order to describe the radiation emission itself. Findings from the present paper thus imply that both methods may be useful for the study of solar radio emissions, as they are complementary.
Stochastic Gravitational-wave Background from Binary Black Holes and Binary Neutron Stars and Implications for LISA
Authors: Chen Zu-Cheng , Huang Fan , Huang Qing-Guo 
Published: January 2019

Abstract
The advent of gravitational-wave and multimessenger astronomy has stimulated research on the formation mechanisms of binary black holes (BBHs) observed by the Laser Interferometer Gravitational-Wave Observatory (LIGO)/Virgo. In the literature, the progenitors of these BBHs could be stellar-origin black holes (sBHs) or primordial black holes (PBHs). In this paper, we calculate the stochastic gravitational-wave background (SGWB) from BBHs, covering the astrophysical and primordial scenarios separately, together with the one from binary neutron stars (BNSs). Our results indicate that PBHs contribute a stronger SGWB than that from sBHs, and the total SGWB from both BBHs and BNSs has a high possibility of being detected by the future observing runs of LIGO/Virgo and the Laser Interferometer Space Antenna (LISA). On the other hand, the SGWB from BBHs and BNSs also contributes an additional source of confusion noise to LISA’s total noise curve, and then weakens LISA’s detection abilities. For instance, the detection of massive black hole binary (MBHB) coalescences is one of the key missions of LISA, and the largest detectable redshift of MBHB mergers can be significantly reduced.
2D Isotropic Feature of Solar Wind Turbulence as Shown by Self-correlation Level Contours at Hour Timescales
Authors: Wang Xin , Tu Chuanyi , He Jiansen 
Published: January 2019

Abstract
The slow wind anisotropy is observed by Dasso et al. as elongation along the magnetic field direction in the magnetic self-correlation contours calculated from data sets of two-day-long data and averaged for five years in 1998–2002, which is consistent with prediction by the “critical balance cascade theory.” More pronounced elongation at smaller scales than at larger scales has also been predicted by this theory. However, this prediction has not yet been checked by observations. Here, we present a check of the variation trend of the anisotropy with scales by presenting level contours of magnetic field and velocity self-correlations using intervals with durations varying from two days to one hour as observed by the Advanced Composition Explorer during 1998–2002 in the slow wind. We find that the level contours elongate along the magnetic field direction at durations of two days and one day. But they become isotropic for shorter intervals from about 10 hours to 1 hour. We also find that in the fast wind, the variation of the anisotropy with the scale has the same trend as in the slow wind. The 2D isotropic feature of the solar wind fluctuations shown by these statistical results is not consistent with the existing theory and will open a new avenue for studying solar wind turbulence.
On the Minimum Jet Power of TeV BL Lac Objects in the p–γ Model
Authors: Xue Rui , Liu Ruo-Yu , Wang Xiang-Yu , Yan Huirong , Böttcher Markus 
Published: January 2019

Abstract
We study the requirement of the jet power in the conventional p–γ models (photopion production and Bethe–Heitler pair production) for TeV BL Lac objects. We select a sample of TeV BL Lac objects whose spectral energy distributions are difficult to explain by the one-zone leptonic model. Based on the relation between the p–γ interaction efficiency and the opacity of γγ absorption, we find that the detection of TeV emission poses upper limits on the p–γ interaction efficiencies in these sources and hence minimum jet powers can be derived accordingly. We find that the obtained minimum jet powers exceed the Eddington luminosity of the supermassive black holes (SMBHs). Implications for the accretion mode of the SMBHs in these BL Lac objects and the origin of their TeV emissions are discussed.