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Search Results: 1 - 10 of 14312 matches for " Leonardo Simal Moreira "
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Geometric Analogy and Products of Vectors in n Dimensions  [PDF]
Leonardo Simal Moreira
Advances in Linear Algebra & Matrix Theory (ALAMT) , 2013, DOI: 10.4236/alamt.2013.31001
Abstract:

The cross product in Euclidean space IR3 is an operation in which two vectors are associated to generate a third vector, also in space IR3. This product can be studied rewriting its basic equations in a matrix structure, more specifically in terms of determinants. Such a structure allows extending, for analogy, the ideas of the cross product for a type of the product of vectors in higher dimensions, through the systematic increase of the number of rows and columns in determinants that constitute the equations. So, in a n-dimensional space with Euclidean norm, we can associate n – 1 vectors and to obtain an n-th vector, with the same geometric characteristics of the product in three dimensions. This kind of operation is also a geometric interpretation of the product defined by Eckman [1]. The same analogies are also useful in the verification of algebraic properties of such products, based on known properties of determinants.

On the Rotation of a Vector Field in a Four-Dimensional Space  [PDF]
Leonardo Simal Moreira
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.51015
Abstract:

Recently I published a paper in the journal ALAMT (Advances in Linear Algebra & Matrix Theory) and explored the possibility of obtaining products of vectors in dimensions higher than three [1]. In continuation to this work, it is proposed to develop, through dimensional analogy, a vector field with notation and properties analogous to the curl, in this case applied to the space IR4. One can see how the similarities are obvious in relation to the algebraic properties and the geometric structures, if the rotations are compared in spaces of three and four dimensions.

Oxigênio: uma abordagem filosófica visando discuss es acerca da educa o em ciências - parte 1: poder e ambi o Oxygen: a philosophical approach aiming at arguments about Science Education - part 1: power and ambition
Leonardo Maciel Moreira
Ciência & Educa??o (Bauru) , 2012, DOI: 10.1590/s1516-73132012000400005
Abstract: A História e Filosofia da Ciência (HFC) tem se tornado um campo com significativas inser es no Ensino de Ciências. Este trabalho tem como objetivo geral apresentar uma análise do texto teatral Oxigênio visando à abordagem da HFC. Especificamente, será apresentada uma análise sobre a constru o do conceito cientista, focalizando as temáticas poder e ambi o. O texto teatral foi analisado utilizando-se a Análise do Discurso na perspectiva foucaultiana. A análise explicitou a problematiza o de quest es com respeito a motiva o, interesses, ética e trabalho científico. Esses aspectos est o inseridos no escopo das discuss es abarcadas pela HFC no sentido de se atingir a alfabetiza o científica. The History and Philosophy of Science (HPS) has become a field with significant insertions in the teaching of Science. The general objective of this paper is to present an analysis of the theatrical text Oxygen aiming at approaching the HPS. Specifically, an analysis of the construction of the concept of the scientist will be presented, focusing on the themes of power and ambition. The theatrical text was analyzed using Discourse Analysis from a Foucauldian perspective. The analysis revealed questions with regard to motivation, interests, ethics and scientific work. Those aspects are inserted in the purpose of the arguments comprised by the HPS in the sense of reaching the scientific literacy.
Atividade fagocitária do sistema mononuclear fagocitário na gravidez
Vasconcellos, Leonardo S.;Sabino, Kelly R.;Petroianu, Andy;Simal, Carlos J. R.;
Revista Brasileira de Hematologia e Hemoterapia , 2003, DOI: 10.1590/S1516-84842003000400006
Abstract: alterations of the immune function during the pregnancy are not well understood. to assess the influence of pregnancy on the phagocytic function of the reticuloendothelial system twenty adult female rats were divided into two groups: group 1 (n=10) - control, group 2 (n=10) - pregnant rats. the assessment of the phagocytic function of the reticuloendothelial system was by the uptake of sulphur colloid labeled with tc99m by the reticuloendothelial system organs as well as to assess the permanence of the radio isotope in blood clots. the weights and radioactive levels of the samples were measured. histologic analyses of these organs were performed as well. the results were compared using the student t-test, with significance at p<0.05. the scintigraphic values were higher in the liver followed by spleen and lung. the blood clot presented with only a low amount of radiation. the pregnant rats registered lower radiation levels in the liver and higher in the lung when compared with the control group. the histo-architecture of the studied organs did not show any alterations. pregnancy reduces the phagocytic function of the liver but increases the role of the reticuloendothelial system function of the lung.
Atividade fagocitária do sistema mononuclear fagocitário na gravidez
Vasconcellos Leonardo S.,Sabino Kelly R.,Petroianu Andy,Simal Carlos J. R.
Revista Brasileira de Hematologia e Hemoterapia , 2003,
Abstract: As altera es imunitárias que ocorrem durante a gravidez s o ainda pouco compreendidas. Para determinar a influência da gravidez na atividade fagocitária do sistema mononuclear fagocitário (SMF) foram utilizadas vinte ratas adultas. Os animais foram divididos em dois grupos (n-10): Grupo 1 - controle, Grupo 2 - ratas prenhas. A fun o do sistema mononuclear fagocitário foi determinada pela capta o de enxofre coloidal marcado com 99mTc pelos órg os do SMF, além de avaliar a permanência do radiofármaco em coágulo sangüíneo. O peso e a radia o de cada amostra foram medidas. Realizou-se também análise histológica desses órg os. Os resultados foram comparados pelo teste t de Student. Em todos os animais, a capta o do radiofármaco foi maior no fígado, seguido pelo ba o e pulm o. O coágulo sangüíneo apresentou uma quantidade mínima de radia o. As ratas grávidas registraram menor capta o do colóide no fígado e maior capta o no pulm o em rela o ao grupo controle. N o foram evidenciadas altera es na histoarquitetura desses órg os. Em rata grávida, a atividade fagocitária do SMF diminuiu no fígado, porém aumentou no pulm o.
“Sevilla y Corte. Las artes y el Lustro Real (1729-1733)”
Mercedes SIMAL
Libros de la Corte.es , 2012,
Abstract:
“La medida del tiempo. Relojes de reyes en la corte espa ola del siglo XVIII”
Mercedes SIMAL
Libros de la Corte.es , 2012,
Abstract:
Ciclos econ?micos regionais no Brasil de 1985 a 2002: uma introdu??o
Cunha, Alexandre B.;Moreira, Leonardo Puccini;
Revista de Economia Contemporanea , 2006, DOI: 10.1590/S1415-98482006000100005
Abstract: we study the business cycle component of the per capita gross domestic product of the brazilian states during the period 1985-2002. in average, the states had cycles more volatile and less persistent than the brazilian cycle. the cyclical phases usually were not temporally coincident across states.
El Palacio del Buen Retiro (1633-1648)
Mercedes SIMAL LóPEZ
Libros de la Corte.es , 2012,
Abstract:
Rese a de "Las experiencias de 1808 en Iberoamérica" (Alfredo ávila y Pedro Pérez Herrero compiladores). Ciudad de México, Universidad Nacional Autónoma de México, Instituto de Investigaciones Históricas/Universidad de Alcalá, Instituto de Estudios Latinoamericanos, 2008, 600 páginas.
Juan Luis Simal
HIb Revista de Historia Iberoamericana , 2009,
Abstract:
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