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OBJETIVO: Caracterizar la frecuencia y tipo de uso de teorías o modelos citados en artículos publicados en una revista latinoamericana de salud publica entre los años 2000 y 2004. MÉTODOS: Se escogió la Revista de Saúde Pública por su historia de publicación periódica sin interrupción e impacto actual en la comunicación científica del área. Se aplicó un procedimiento estándar para leer los artículos y clasificarlos en una tipología arbitraria de cuatro niveles según la profundidad del uso dado a los referentes teóricos o modelos citados en los textos para describir asuntos o problemas abordados, formular métodos y discutir a rigor los hallazgos comunicados. RESULTADOS: Se leyeron 482 artículos: 421 (87%) investigaciones, 42 (9%) revisiones o especiales y 19 (4%) textos de opinión o reflexión. En las 421 investigaciones, 286 (68%) tuvieron enfoque cuantitativo, 110 (26%) cualitativo y 25 (6%) mixtos. La cita de teorías o modelos fue infrecuente; 90 (19%) artículos revisados citan algun referente. Según la profundidad de uso 29 (6%) de los 90 fueron tipo I, 9 (1,9%) tipo II, 6 (1,3%) tipo III y 46 (9,5%), tipo IV. CONCLUSIONES: La citación de modelos fue nueve veces más frecuente que la de alguna teoría; el uso ideal, el tipo IV, ocurrió en apenas uno de cada diez artículos analizados. Hay relevancia de explicitar los marcos teóricos y modelos usados al abordar temas, formular hipótesis, diseñar métodos y discutir hallazgos en las contribuciones de las revistas científicas del área.OBJETIVO: Caracterizar a freqüência e tipo de uso de teorias ou modelos citados em artigos publicados em uma revista latino-americana de saúde pública entre os anos 2000 e 2004. MÉTODOS: A Revista de Saúde Pública foi escolhida por sua história de publicação ininterrupta e atual impacto na comunicação científica da área. Foi aplicado um procedimento padrão para ler e classificar os artigos de acordo com tipologia de quatro níveis, segundo a profundidade de uso dado aos referenciais teóricos ou modelos citados nos textos para descrever assuntos ou problemas abordados, formular métodos e discutir a rigor os achados comunicados. RESULTADOS: Foram lidos 482 artigos: 421 (87%) investigações, 42 (9%) revisões ou especiais e 19 (4%) textos de opinião ou reflexão. Nas 421 investigações, 286 (68%) tiveram enfoque quantitativo, 110 (26%) qualitativo e 25 (6%) mistos. A menção a teorias ou modelos não foi freqüente; apenas 90 (19%) dos artigos revisados citavam alguma teoria ou modelo. Segundo a profundidade de uso, 29 (6%) dos 90 foram tipo I, 9 (1,9%) tipo II, 6 (1,3%) tipo III e 46 (9,5%), tipo IV. CONCLUSÕES: A citação de modelos foi nove vezes mais freqüente do que de alguma teoria; o uso ideal, de tipo IV, ocorreu em apenas um de cada dez artículos analisados. É relevante explicitar os marcos teóricos e modelos usados ao abordar temas, formular hipóteses, desenhar métodos e discutir achados nas contribuições das revistas científicas da área.OBJECTIVE: To characterize frequency and type of use of theories or models on papers of a Latin-American journal in public health between 2000 and 2004. METHODS: The Revista de Saúde Pública was chosen because of its history of periodic publication without interruption and current impact on the scientific communication of the area. A standard procedure was applied for reading and classifying articles in an arbitrary typology of four levels, according to the depth of the use of models or theoretical references to describe problems or issues, to formulate methods and to discuss results. RESULTS: Of 482 articles included, 421 (87%) were research studies, 42 (9%) reviews or special contributions and 19 (4%) opinion texts or assays . Of 421 research studies, 286 (68%) had a quantitative focus, 110 (26%) qualitative and 25 (6%) mixed. Reference to theories or models is uncommon, only 90 (19%) articles mentioned a theory or model. According to the depth of the use, 29 (6%) were classified as type I, 9 (2%) as type II, 6 (1.3%) were type III and the 46 remaining texts (9.5%) were type IV. CONCLUSIONS: Reference to models was nine-fold more frequent than the use of theoretical references. The ideal use, type IV, occurred in one of every ten articles studied. It is of relevance to show theoretical and models frames used when approaching topics, formulating hypothesis, designing methods and discussing findings in papers.

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Copyright of Brazilian Journal of Occupational Therapy / Cadernos Brasileiros de Terapia Ocupacional is the property of Cadernos de Terapia Ocupacional da UFSCar and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Educação Matemática Pesquisa is the property of Pontificia Universidade Catolica de Sao Paulo, Programa de Estudos Pos-Grad. em Educacao Matematica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Educação Matemática Pesquisa is the property of Pontificia Universidade Catolica de Sao Paulo, Programa de Estudos Pos-Grad. em Educacao Matematica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This paper investigates how STEM education is mobilized in the development of mathematical modeling activities with experimentation. For this, it was based on a theoretical framework that considers elements of experimentation, mathematical modeling, and the integration of STEM education. The activities analyzed were developed by three groups of students from a 9th-grade class of elementary school from a private school in the state of Paraná, in the mathematics subject, in the year 2018. In these activities, gathered in groups, the students chose the theme of experimentation to be carried out, defined a problem, collected empirical data, performed a mathematical approach, and obtained a solution to the problem. For the analyses, audio and video recordings and written records of reports delivered by students were used. Through qualitative analysis, inspired by the research design, it became evident that experimentation was configured as a structure that allowed the integration between STEM areas through studies and research on the studied phenomena, manipulation of software for curve adjustments, use of laboratory equipment and its implications for the experimentation carried out, and on the mathematical content necessary to obtain a solution to the problem. [ABSTRACT FROM AUTHOR]

This paper elaborated a theoretical mathematical model that verifies if the capital of the companies can control the employment level of the Industrial Pole of Manaus and maintain long-term profit at optimal levels. We use the mathematical Optimal Control Theory whose objective function is composed of the Cobb-Douglas production curve and the linear function, representing the firms' profit. As a result, the time trajectories are at optimal levels, accompanied by variations in the control element until the reestablishment of the effectiveness of the factors and the global optimality of profits, confirming the economic theory. Finally, this work shows that the modeling of economic concepts, using the Theory of Optimal Control, results in the best response to the dynamics of inputs, labor and capital, in a scenario of imbalance of firms, ensuring the best decision by levels practiced and, mainly due to the better trajectory of the factors. [ABSTRACT FROM AUTHOR]

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The purpose of this paper is to reflect on the functioning of language expressed in language games in mathematical modelling activities. The reflection is guided by a theoretical framework related to the considerations of Ludwig Wittgenstein's philosophy and the students' referrals in a modelling activity developed in a Mathematical Modelling discipline by students in the seventh period of a mathematics degree. The data comes from students' reports and teacher's class notes. The analysis of the activity, following a therapeutic attitude, as we read in philosophy according to Wittgenstein, on the one hand, leads us to consider that modelling activities free us from the imposition of language games often practiced in mathematics classes, enabling language games that act as a way of organizing our experiences with the world through mathematics. On the other hand, mathematical modelling in the classroom can be organized by language games that do little to free us from fundamentalist mathematics, imprisoning us in a set of rules in which we follow steps associated with a modelling activity, but we deviate little from the symbolic language admittedly accepted in a way of life, not letting the knowledge and unpredictability of language games flow, as mentioned by Wittgenstein. [ABSTRACT FROM AUTHOR]

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Copyright of Brazilian Journal of Applied Economics / Economía Aplicada is the property of FEA-RP, Universidade de Sao Paulo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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In general, the identification of probability distributions for time between arrivals and the covariates that affect them, get a superficial treatment in papers on production engineering. The main goal of this paper is to analyze the data on the time between arrivals for batches at the quality control department in a food company. A Weibull distribution, with two parameters, was used in the statistical modeling - a quantitative approach. Scale and shape was estimated by the Maximum Likelihood Method. A regression Weibull model was considered to evaluate inferences for the mean and median times between arrivals and to detect important factors affecting the variability in data sets. Considering some covariates, the Weibull distribution was found to have a good fit for the data. These results allow for a more reliable modeling of the quality control department for discrete event simulation. [ABSTRACT FROM AUTHOR]

This paper addresses the two-stage production problem with parallel machines. We present two mathematical models that consider the production of different products with two stages of production in parallel machines and buffer between the stages. The two models consider minimum and maximum time of permanence of the items in the buffer, and the second considers costs of discarding, reprocessing and acceleration of the lots. Also, we propose several strategies of Fix and Optimize heuristic that start from an initial solution, through a constructive heuristic of decomposition. In general, the results show that the heuristic strategies can achieve competitive solutions in short computational time, outperforming the results provided by the optimization solver. [ABSTRACT FROM AUTHOR]

This research aimed to carry out a bibliographic survey to identify master’s degree theses that used some theory of the didactics of mathematics as a theoretical and/or methodological support for teaching and learning the linear function. To achieve the objective, a survey of papers already produced in the Catálogo de Teses e Dissertações da Coordenação de Aperfeiçoamento de Pessoal de Nível Superior/Catalogue of Dissertations and Theses of the Coordination for the Improvement of Higher Level Personnel (CAPES) was carried out. Through the analyses, it was possible to identify the number of works that approached the didactics of mathematics theories and how the teaching and learning of the linear function were approached. The analyses also indicated that the theory of registers of semiotic representation was the most used in the theses. [ABSTRACT FROM AUTHOR]

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Copyright of Latin-American Journal of Physics Education is the property of Latin-American Physics Education Network and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Brazilian Journal of Scientific Administration / Revista Brasileira de Administração Científica is the property of CBPC - Companhia Brasileira de Producao Cientifica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This paper presents the shell finite elements of the computer system INSANE (INteractive Structural ANalysis Environment): four-node rectangular and three-node triangular, obtained by combining membrane and bending efforts, based on the Theory of Kirchhoff; a quadrilateral of four, eight and nine nodes that combines membrane, bending and shear efforts, according to the Reissner-Mindlin Theory. After summarizing the characteristics of the elements, the paper presents results of three convergence studies and two practical applications: an arch dam and a conical-cylindrical reservoir. The results are compared with analytical solutions and those obtained with the shell finite element of SAP2000. [ABSTRACT FROM AUTHOR]

Copyright of Colloquium Exactarum is the property of Asociacao Prudentina de Educacao e Cultura (APEC) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this paper we have taken back a previously published one in order to broaden the discussion considering another referential. It refers to an Epistemological Model of Reference (EMR) for the construction of surface planning of triangulated pyramids of determined height, verifying conditions and restrictions using Geogebra. EMR can justify pedagogic organization that enable the method Study and Research Activities (SRA), which is developed from questions emerging that will lead to the resolution of the proposed problem. The main objective of the study is supporting the surface representation of geometric solids work. [ABSTRACT FROM AUTHOR]

This paper constitutes an essay in which we propose to present and discuss a model for the investigation of phenomena related to the cognitive dimension from the anthropological theory of the didactic (ATD). This model is one of the main results of the doctoral thesis of the first author. In his thesis he set out to characterize the place of the psychological subject in ATD. Of theoretical-empirical nature, this study assumes cognition as a phenomenon located in the institutional context and analyzes the functioning of the didactic system in the teaching of probability in the degree in Mathematics. The analysis of the didactic system culminated in the proposition of an investigation model which is organized in three levels: 1. Institutional dimension that reinforces the context of institutions; 2. Dimension of the didactic system functioning that is linked to the practices related to mathematical activities; and 3. Personal dimension, that refers to the participation and engagement of the subjects in the didactic system. In order to present the model, we initially retake theoretical elements of social anthropology to argue for cognition as a phenomenon situated in the institutional context. Then, we characterize the place of the psychological subject in ATD and we propose a model to analyze phenomena and aspects related to the cognitive dimension from the anthropological approach of the didactic. [ABSTRACT FROM AUTHOR]

This paper is part of an investigation on the problem of knowledge infrastructure necessary for the development of school mathematical modeling on problems in context. For this, the research cycle of mathematical modeling is proposed as a device inspired by the five gestures that characterize a real research in the light of the anthropological theory of the didactic. Results obtained from the empirical analysis of a problem in context show the potential of the mathematical modeling research cycle for the acquisition of new useful knowledge, if not indispensable to teachers in formation, as well as forwards future research. [ABSTRACT FROM AUTHOR]

Copyright of Perspectiva Econômica is the property of Universidade do Vale do Rio dos Sinos and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Some researchers use loyalty and commitment as different constructs in their models. Others', as Prado and Santos (2003), argue that these two are in fact just one concept. The literature about that is sometimes obscure. In this context, this paper tries to analyze the association between loyalty and commitment in the virtual environment, specifically in ecommerce. The results indicated that both constructs are just one. In addition, using Fornell and Larcker (1981) suggestion, the data again confirmed the only construct. Final considerations and research limitations end the paper. [ABSTRACT FROM AUTHOR]

This paper presents some analysis on Lorenz (1996) system of equations, modified to represent the dimensions of the emotional space, which served as the basis of the simulations developed by Losada and Heaphy (1998) for the construction of the Meta-learning Model applied to performance evaluation of enterprises. On the order hand describes the logistic equation, showing the saturation with time for physical, biological or social systems as a result of the running out of some essential means - flux or stock of a variable. The hypothesis assumed from intuition by Carneiro (2006) are also studied for the development of a methodology of performance evaluation and construction of academic groups, whose analysis were left to this paper, specially for the readers interested on the mathematical representations of the processes under investigation. The empirical verifications are the object of a research at present under development. [ABSTRACT FROM AUTHOR]

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Copyright of Revista Ciencias Estratégicas is the property of School of Strategic Studies - ECE and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Gliomas are malignant brain tumors responsible for 50% of primary human brain cancer cases. They have a combination of rapid growth and invasiveness, and high fatality rates with a median survival time of one year. Mathematical models that describe its growth have helped to improve treatment. In this paper, a combined model formed by terms of two other models known in the literature is analyzed. The combined model is a Reactive-Advective-Diffusive partial differential equation, which is solved by combining the finite difference method, the Crank-Nicolson method and the upwind method. Logistic growth is used for cell proliferation ensuring a saturation threshold for glioma growth, which is crucial to properly estimate patient survival time. The well-known linear-quadratic radiobiological model is used to describe cell death due to radiotherapy treatment. Two initial conditions are compared in the simulations, indicating the need for further studies to have a model as close as possible to reality. Simulation results are shown for four scenarios: no radiotherapy, application of a single dose, and two dose fractionation schemes.

Temperature control is of paramount importance during hot rolling of steel. Thus, sensors need to be installed through the processing lines. In addition, mathematical models for temperature prediction are useful, and occasionally necessary, when the thermal profile inside the stock has to be known, besides the measured surface temperature. Therefore, this paper shows the background used to modeling the temperature evolution of steel during hot rolling, from the slab reheating process up to the as rolled product after its cooling. Basic features are shown such as model formulations, numerical methods and validations. All the work was based on recent development carried out at Usiminas' Research and Development Center, where theoretical background found in literature was adapted and fitted to the processing line particularities. In addition, as an indicator of innovation and applicability, the models were implemented as offline simulation tools, making easy their use by technical staff. [ABSTRACT FROM AUTHOR]

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This paper analyzes whether the higher the company's financial leverage, the higher the salaries demanded by staff for the embedded financial distress risk. By applying Berk, Stanton and Zechner's (2010) model, we use a 2SLS for a sample of 250 non-financial companies listed on BOVESPA from 2007 to 2009. Indeed, we find that for each additional 1% of financial leverage, the staff remunerations increase by 0.26%, controlling for Chief Executive Officer (CEO) profile. [ABSTRACT FROM AUTHOR]

Management is a practice that encompasses planning, organization, guidance, control and monitoring of activities in terms of means and ends. This paper presents a management system modelling for Distance Education in programs offered in Brazilian public institutions, using colored Petri nets. Moreover, it is important to mention that management acquires a high degree of complexity due to the fact that in order to deploy and maintain the distance learning courses, a set of processes that integrate and influence each other, aiming to reach pre-defined goals is required. Therefore, in order to achieve this level of complexity, this job involves tasks such as work division, responsibility assignments, setting levels of authority and to establish communication mechanisms. Accordingly, the systemic management system, currently applied to distance learning courses offered by IFCE (Federal Institute of Education, Science and Technology of Ceará), comprises five major pillars which are: institutional, educational, technological, administrative, financial and human resources. Hence, the scope of this work deals with the modelling of the administrative and financial management process in coloured Petri nets. The model analysis has helped to identify and improve actions and activities developed in the process. It also allowed the group to have a graphical and an administrative view, which helped them to plan and execute all the funds received to run the Distance Education courses. In addition, another important aspect to mention concerns the transformation of tacit knowledge into explicit knowledge, such that the execution of administrative and financial processes becomes less dependent on the people who devised it. [ABSTRACT FROM AUTHOR]

Copyright of Alfa: Revista de Lingüística is the property of Alfa: Revista de Linguistica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)