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Pitágoras e van Hiele: uma possibilidade de conex o Pythagoras and van Hiele: a possible connection
José Carlos Pinto Leivas
Ciência & Educa??o (Bauru) , 2012, DOI: 10.1590/s1516-73132012000300010
Abstract: Este trabalho analisa como um grupo de alunos da licenciatura em Matemática e de professores em a o continuada enuncia e representa o Teorema de Pitágoras. A pesquisa tem conota o qualitativa e foi realizada num evento de Educa o Matemática, durante a realiza o de uma oficina sobre os níveis de van Hiele, no segundo semestre do ano de 2010. Aspectos de visualiza o e representa o foram observados, e constatamos que a maioria absoluta dos sujeitos investigados n o expressa corretamente o teorema numa linguagem matemática apropriada, estabelecendo conflitos cognitivos entre aspectos de medida e de formas. Além disso, as representa es do teorema, feitas pelos sujeitos, se limitam, quando o fazem, a uma única situa o, e n o d o sinais de identificarem uma generaliza o do teorema, além do aspecto geométrico de construir quadrados sobre os lados de um triangulo retangulo. This work analyses how a group of graduate students of Mathematics and practicing teachers represent Pythagoras's Theorem. The research has a qualitative approach and was held at an event of Mathematics Education, during a workshop on the van Hiele levels in the second half of 2010. Aspects of visualization and representation were observed and we found that the majority of investigated subjects don't use an appropriate language for the mathematical theorem, establishing conflict between cognitive aspects and forms of measurement. Furthermore, representations of the theorem, given by the subjects are limited, when they give them, to a single location and they don't give signs to identify a generalization of Theorem beyond the geometric aspect of constructing squares on the sides of a triangle.
Philosophia prima como repraesentatio na filosofia natural de Hobbes: exame de fundamentos metafísico-cognitivos como complementos teóricos de seu materialismo mecanicista
Leivas, Cláudio R. C.;
Manuscrito , 2011, DOI: 10.1590/S0100-60452011000200006
Abstract: the starting point of philosophia prima of hobbes has as reference physics and metaphysics of aristotle. the later development of his philosophia prima, however, sets in motion a critique of aristotelian metaphysics that will lead to a theoretical reorganization of a series of principles and concepts inherited from tradition. considered as a whole, the first hobbesian philosophy consists of a broad definition, that is metaphysics defined as the science of the entity as entity (instead of the classical definition of science of the being as being), on which are erected two strictu sensu definitions: metaphysics as general physics - to say the entity (ens) is to say the body (corpus) - and metaphysics as a representation. this paper is an effort to understand these and other questions related to studies hobbesian on how we know the world, things and ourselves.
Paix?o, democracia e delibera??o em Hobbes e Walzer
Leivas, Cláudio R. C.;
Trans/Form/A??o , 2009, DOI: 10.1590/S0101-31732009000200003
Abstract: the article examines the relationship among passion, democracy and deliberation in the thought of hobbes and walzer. reasons are presented by which those two thinkers are positioned in a critical way regarding the deliberations in the democratic governments' extent. the relationship between reason and passion is also examined inside the central problem of our comparative study.
A teoria óptica de Hobbes
Cláudio R. C. Leivas
Princípios : Revista de Filosofia , 2007,
Abstract: The present article intends to bring out the general lines of Hobbes′s optical theory. However, before examine the development of his optical studies, we will make a preliminary résumé concerning opticals conceptions prior to Hobbes′s, with the purpose to situate the reader in the context of optic’s History.
The science of the preservation of the state: hobbes and the question of dissolution and maintenance of modern political state = A ciência da conserva o do estado: hobbes e a quest o da dissolu o e manuten o do estado político moderno
Leivas, Cláudio R. C.
Veritas , 2012,
Abstract: A quest o da dissolu o e manuten o do Estado é um aspecto da filosofia política de Hobbes que ainda n o mereceu um exame na mesma extens o e importancia geralmente atribuídas a outros temas pertencentes aos seus escritos políticos. Evidencio neste estudo a preocupa o do filósofo inglês em mostrar que a ciência de conservar Estados possui o mesmo valor e calibre científico filosófico do que a ciência de construir Estados. A divis o tripartite deste estudo tem como propósito investigar, primeiro, as causas e os personagens associados à dissolu o do Estado, depois, os preceitos e artifícios relacionados à manuten o do Estado e, por fim, os atos de hostilidades (trai o e espionagem, por exemplo) que necessitam ser conhecidos e combatidos pelo representante soberano porque afrontam e contradizem o imperativo de seguran a salus populi suprema lex (a seguran a do povo é lei suprema) e os princípios de raz o que sustentam in totum a arquitet nica pública hobbesiana. The question of dissolution and maintenance of the state is an aspect of Hobbes’s political philosophy that has not yet received a survey to the same extent and importance usually attributed to other issues pertaining to his political writings. I emphasize in this study the English philosopher’s concern to show that the science of conserving States has the same value and scientific philosophical caliber than the science of building States. The tripartite division of this study aims to investigate first the causes and the characters associated with the dissolution of the state, then the precepts and processes related to the maintenance of the State and, finally, the acts of hostilities (treason and espionage, for example) that need be known and combated by the sovereign representative because someone else affronts and contradicts the security imperative salus populi suprema lex (safety of the people is the supreme law) and the principles of reason that sustain in totum the Hobbesian public architectonic.
Evaluation of the composition of terrestrial invertebrates in a rural area of Campina Grande do Sul, Paraná, Brazil
Fernando Willyan Trevisan Leivas,Marta Luciane Fischer
Biotemas , 2008,
Abstract: The terrestrial invertebrates participate actively in the formation of the soil, and can be utilized as bioindicators of environmental disturbance. Thus, the objective of this research was to evaluate the fauna composition of terrestrial invertebrates, in a rural area of Campina Grande do Sul. The collection was carried out in a single fragment of Araucaria Forest, with structurally differentiated two-point samplings, through pitfall traps. A total of 1,776 invertebrates was captured, pertaining to Arthropoda, Annelida, Mollusca and Plathyhelminthes phyla, of which Arthropoda and Hexapoda were the most representative groups. In Hexapoda, eleven orders were registered, and of those, Coleoptera, Hymenoptera, Collembola and Diptera were the most abundant. Although the studied fragment had been under recuperation for about 10 years after approximately 40 years of antropic interference, and was therefore surrounded by areas utilized for farming, agriculture and highways, it contained different groups of terrestrial invertebrates on wide-ranging thropic levels, which were important for the spatial structure and the composition of litterfall of the fragment.
Diet and trophic niche of Lithobates catesbeianus (Amphibia: Anura)
Peterson T. Leivas,Fernando W. T. Leivas,Maurício O. Moura
Zoologia (Curitiba) , 2012, DOI: 10.1590/s1984-46702012000500003
Abstract: Lithobates catesbeianus (Shaw, 1802) is an invasive anuran introduced in Brazil that is associated with the displacement and the decline of populations of native species worldwide. There is evidence that biological invasions are facilitated by certain attributes of the invading species, for instance niche breath, and that invasive species have a broader ecological niche with respect to native ones. We designed a study to ascertain the temporal, ontogenetic, and sex differences in the niche dynamics of the American bullfrog. We sampled monthly from June 2008 to May 2009 in the state of Paraná, southern Brazil. For each individual, we gathered biometric and stomach content data. We then estimated the niche breath of the juveniles and adults, and compared it between the sexes. A total of 104 females and 77 males were sampled. Lithobates catesbeianus has a generalist diet, preying upon invertebrates and vertebrates. Even though the diet of the studied population varied seasonally, it did not differ between the sexes nor did it respond to biometric variables. Niche breadth was more restricted in the winter than in the autumn. The trophic niche of juveniles and adults did not overlap much when compared with the trophic niche overlap between males and females. Adult males and females had a considerable niche overlap, but females had a broader trophic niche than males in the winter and in the spring. These niche characteristics point to an opportunistic predation strategy that may have facilitated the process of invasion and establishment of this species in the study area.
El patrimonio cultural del ISPJAE y su relación con la Disciplina Preparación para la Defensa
Portero Ricol,Ada Esther; Machado Jardo,Ricardo; Marreno Leivas,Carina;
Arquitectura y Urbanismo , 2012,
Abstract: this paper provides an approach to the protection and conservation of the cultural heritage of the university and its relation with national defense, taking into consideration those subject included in the discipline preparation for defense, devoted to technical sutidies at the josé antonio echeverría higher polytechnic institute. the main aim is to show the importance of having a wide knowledge about the cultural heritage in the formation of values as well as the need to preserve the identity of the university community and the country defense.
Risco de deficiência hídrica decendial na metade sul do Estado do Rio Grande do Sul
Leivas, Janice F.;Berlato, Moacir A.;Fontana, Denise C.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2006, DOI: 10.1590/S1415-43662006000200022
Abstract: the objective of this study was to analyze the risk of occurrence of water deficit for periods of ten days in the southern half of the rio grande do sul state. daily meteorological data were obtained from nine localities, distributed over the five ecoclimatic regions (campanha, depress?o central, grandes lagoas, litoral and serra do sudeste) of the southern half of the state, during the period of 1961 - 1990. ten days intervals water balances were computed, using the thornthwaite-mather method, with a soil water storage capacity of 50 and 125 mm. from these computations, the ten days water index (ih = etr/eto) was obtained. in order to verify the risk of occurring a water deficit, the value of 0.6 was adopted as critical value. analysis of the results show that the campanha region has the largest probability of occurrence of water deficit in a ten days period, mainly in the period between 2nd ten days of december to 2nd ten days of january.
Rhipicephalus (Boophilus) microplus: expression and characterization of Bm86-CG in Pichia pastoris
Cunha, Rodrigo Casquero;Andreotti, Renato;Leite, Fábio Pereira Leivas;
Revista Brasileira de Parasitologia Veterinária , 2011, DOI: 10.1590/S1984-29612011000200003
Abstract: the cattle tick rhipicephalus (boophilus) microplus is responsible for great economic losses. it is mainly controlled chemically, with limitations regarding development of resistance to the chemicals. vaccines may help control this parasite, thereby reducing tick pesticide use. in this light, we performed subcloning of the gene of the protein bm86-gc, the homologue protein that currently forms the basis of vaccines (gavactm and tickgardplus) that have been developed against cattle ticks. the subcloning was done in the ppic9 expression vector, for transformation in the yeast pichia pastoris. this protein was characterized by expression of the recombinant mut+ strain, which expressed greater quantities of protein. the expressed protein (rbm86-cg) was recognized in the western-blot assay using anti-gavac, anti-tickgard, anti-larval extract and anti-rbm86-cg polyclonal sera. the serum produced in cattle vaccinated with the antigen cg rbm86 presented high antibody titers and recognized the native protein. the rbm86-gc has potential relevance as an immunogen for vaccine formulation against cattle ticks.
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