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Comparison of Mathematical Methods to Obtain Concentration and Temperature of Newtonian Fluids in Tubular Reactors  [PDF]
Diego Alves de Miranda, Renato Cristofolini, Emerson José Corazza, Gilson Joao dos Santos, Claiton Emilio do Amaral
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104329
Abstract:
In several areas of engineering, it is possible to put real problems in mathematical functions; when we represent a problem with variables in the form of function, we were able to extract various information from it. This paper compared two different mathematical methods, being the finite difference method and the Fourth Order Range-Kutta method, to analyze the concentration and temperature of the water flow inside a tubular reactor. These results were compared with the analytical and experimental results of the problem, demonstrating that the Fourth Order Range-Kutta method was more advantageous than the finite difference method.
Reducción del Tiempo de Ciclo de Inyección de Termoplásticos con el uso de Moldes con Tratamiento Superficial por Nitruración
Corazza,Emerson J; Sacchelli,Carlos M; Marangoni,Cintia;
Información tecnológica , 2012, DOI: 10.4067/S0718-07642012000300007
Abstract: a study on the heat transfer in a mold, comparing experimental injection tests using a mold with and without surface treatment (nitriding) is presented. process simulations were carried out using computer aided engineering tools (cae) for the estimation of the initial parameters to be applied in the tests in instrumented p20 steel injection molds with the polymer crystal polystyrene. results indicated a reduction of cooling time and of the time of the process in the mold with treatment, due to an increase of the thermal conductivity.
Reducción del Tiempo de Ciclo de Inyección de Termoplásticos con el uso de Moldes con Tratamiento Superficial por Nitruración Cycle Time Reduction of Thermoplastic Injection using Nitriding Treatment Surface Molds
Emerson J Corazza,Carlos M Sacchelli,Cintia Marangoni
Información Tecnológica , 2012,
Abstract: Se presenta un estudio sobre la transferencia de calor en un molde, comparando los ensayos de inyección utilizando moldes con y sin tratamiento superficial de nitruración. Simulaciones del proceso se realizaron con el uso de Asistencia Computacional a Ingeniería (CAE) para determinar los parámetros iniciales que se aplicaron en los ensayos reales en moldes instrumentados de acero P20 (con y sin tratamientos), inyectados con el polímero poliestireno cristal. Los resultados indicaron una reducción del tiempo de enfriamiento y del tiempo de proceso en el molde con el tratamiento, debido a una mejora en la conductividad térmica. A study on the heat transfer in a mold, comparing experimental injection tests using a mold with and without surface treatment (nitriding) is presented. Process simulations were carried out using Computer Aided Engineering tools (CAE) for the estimation of the initial parameters to be applied in the tests in instrumented P20 steel injection molds with the polymer crystal polystyrene. Results indicated a reduction of cooling time and of the time of the process in the mold with treatment, due to an increase of the thermal conductivity.
Application of a subdivision algorithm for solving nonlinear algebraic systems = Aplica o de um algoritmo de subdivis o para solu o de sistemas de equa es algébricas n o-lineares
Fernanda de Castilhos Corazza,José Vladimir de Oliveira,Marcos Lúcio Corazza
Acta Scientiarum : Technology , 2008,
Abstract: A subdivision algorithm is presented and applied to solving commonlyfound chemical engineering problems described by nonlinear algebraic systems. For this purpose, a web-based library available in the literature was used as the main source to select a wide class of one- and multidimensional problems, comprising phase and chemicalequilibrium, conversion in tubular and continuous stirred tank reactors, material and energy balances, etc. The problems are classified according to the literature as low, intermediate and of high degree of numerical difficulty based on specific characteristics, like discontinuities in the functions, multiple solutions with the occurrence of false and unfeasible roots, and the presence of null derivative values. It is shown that the algorithm isefficient and robust, even for multidimensional problems of high numerical difficulty, allowing to find simultaneously all the feasible roots of nonlinear algebraic systems, naturally excluding false and unfeasible solutions, with a relatively low CPU time. Thesefeatures make the algorithm an interesting alternative to deal with chemical engineering problems in contrast to some methods currently in the literature. Um algoritmo de subdivis o é apresentado e aplicado à solu o de problemas descritos por sistemas de equa es algébricas n o-linearescomumente encontrados na engenharia química. Uma biblioteca disponível, na literatura, foi utilizada como fonte principal para a sele o dos problemas a serem resolvidos com uma ou várias dimens es, compreendendo problemas de equilíbrio químico e de fases, convers oem reatores tubulares e contínuos, balan os material e energético, entre outros. Os problemas foram classificados pela literatura com grau de dificuldade numérica baixa, intermediária e alta, com base em características específicas como a existência de descontinuidades nas fun es, múltiplas solu es com raízes falsas. O algoritmo mostrou-seeficiente e robusto, mesmo para problemas multidimensionais de alta dificuldade numérica, permitindo encontrar simultaneamente todas as raízes corretas (fisicamente possíveis) dos sistemas algébricos n o-lineares, naturalmente excluindo solu es falsas com um tempo deCPU relativamente baixo. Estas características fazem deste algoritmo uma alternativa interessante para solucionar os problemas da engenharia química em contraste com alguns métodos atualmente disponíveis na literatura.
Ter os, “Santinhos” e Versículos: A rela o entre Católicos Carismáticos e a Política
Emerson José Sena da Silveira
REVER : Revista de Estudos da Religi?o , 2008,
Abstract: The article analyzes the complex relationship between charismatic Catholics and politics, the latter being understood as the exercise of power through representative, party-based democracy. The rituals and cosmology particular to the Catholic Charismatic Renewal influence the form in which charismatic Catholics enter into the dispute among political parties for control of the State. The use of labels such as “conservatives” or “right-wing reactionaries” must be reconsidered in accordance with the Charismatic world-view, as well as with the rituals and symbolic mechanisms that sustain its plausibility. Finally, the article deals with the participation of Charismatics in elections, as well as with the issue of party representation.
Determina??o experimental da viscosidade e condutividade térmica de óleos vegetais
Brock, Josiane;Nogueira, Maria Rita;Zakrzevski, Cláudio;Corazza, Fernanda de Castilhos;Corazza, Marcos Lúcio;Oliveira, José Vladimir de;
Ciência e Tecnologia de Alimentos , 2008, DOI: 10.1590/S0101-20612008000300010
Abstract: this work reports experimental data of thermal conductivity and dynamic viscosity of the following refined vegetable oils: rice, soybean, corn oil, sunflower, cottonseed, and olive oil. measurements of thermal properties were carried out in a cell coupled to a thermostatic bath in the temperature range of 20-70 °c, using a single-needle stainless steel sensor. it was experimentally observed that the thermal conductivity decreased slightly with increasing temperature for all samples investigated. the gravimetric method was employed for density data acquisition, and revealed no significant difference among the values obtained. the brookfield apparatus was employed in measuring the dynamic viscosity and it was verified that a raise in temperature led to a sharp decrease for this property for all samples investigated.
Il video, un mediatore per l’apprendimento
Laura Corazza
Form@re : Open Journal per la Formazione in Rete , 2013,
Abstract: Il mediatore è un ponte, un collegamento fra quello che un soggetto ha già e quello che l’altro gli porta (Canevaro, 2008). Un mediatore efficace deve corrispondere alle caratteristiche di multimodalità e multimedialità. Il video può essere un mediatore efficace, una forma di narrazione aperta e metacognitiva. I rischi sono la spettacolarizzazione e la manipolazione. Occorre pertanto sviluppare una modalità di fare video che consideri al centro la persona e che investa nel progetto scientifico e culturale.
Os Bancos Centrais e sua ambivalência público-privada [Central Banks and their public-private nature]
Gentil Corazza
Nova Economia , 2001,
Abstract: The paper analyzes the historic origin of Central Banks, from three basic processes: the evolution and convergence of the free banking system to a hierarchical and centralized system in the Central Bank; the transformation of Clearing Houses in Central Banks, and finally, the processes by which governmental banks were assuming Central Bank s functions and transforming themselves in Central Banks. The assumes the hypothesis by which the Central Banks were not created arbitrarily by Government, but from the evolution of private banking system suffering periodic crises, which needed public intervention. Finally, the paper concludes that this historic origin grounds the ambivalent public-private nature in Central Banks.
Compara??o dos gastos com material para repara??o de perfura??es de córnea com cola de cianoacrilato e sutura de córnea
Ueda, Emerson Lioji;Ottaiano, José Augusto Alves;
Arquivos Brasileiros de Oftalmologia , 2004, DOI: 10.1590/S0004-27492004000100017
Abstract: purpose: the aim of this study was performing a comparative evaluation of cost in small ocular perforation repair using cyanoacrylate adhesive technique super bondertm (methyl-2-cyanoacrylate) as compared with corneal suture technique. methods: in order to compare evaluations of cost a cost analysis in "reais" (r$) was conducted for both techniques according to the materials used in cyanoacrylate glue technique and the corneal suture. results: the analysis of comparative cost of the cyanoacrylate adhesive technique in small perforations versus corneal suture showed a lower cost of the former. conclusion: lower cost was found for the cyanoacrylate glue technique for corneal perforation repair when compared to the corneal suture technique.
Compara o dos gastos com material para repara o de perfura es de córnea com cola de cianoacrilato e sutura de córnea
Ueda Emerson Lioji,Ottaiano José Augusto Alves
Arquivos Brasileiros de Oftalmologia , 2004,
Abstract: OBJETIVO: Avalia o comparativa de custos de repara o de pequenas perfura es oculares utilizando a técnica da cola de cianoacrilato Super Bonder (2-metil-cianoacrilato) comparada à técnica de sutura de córnea. MéTODOS: A fim de avaliar comparativamente os custos do uso da técnica de cola de cianoacrilato com a técnica de sutura de córnea, realizou-se análise dos materiais usados em ambas técnicas. RESULTADOS: A análise de custos comparativos entre o uso da técnica de cola de cianoacrilato em pequenas perfura es, versus a técnica de sutura de córnea demonstrou menor gasto com uso do adesivo. CONCLUS O: A utiliza o da técnica de cola de cianoacrilato, para repara o de perfura o de córnea, apresentou custos menores quando comparada com a técnica de sutura de córnea.
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