O ensino por problemas e trabalho experimental dos estudantes: reflexões teórico-metodológicas

This work focuses its attention in teaching through problems, as a methodological strategy in the system of chemistry learning situations. The philosophical and epistemological basis of our perspective are the works that were developed by M. Majmutov and M.M. Llantada, in the field of sciences didactics and in the social-historical context of the school, where the fundamental categories that structure teaching through problems are discussed: the problem, the problematic tasks and problematic, as main orientations in the process of construction of the knowledge by the students.

Reflexões sobre a contribuição da Carnot à primeira lei da termodinâmica

The classical interpretations of Nicolas Léonard Sadi Carnot on some physical principles involved in the operation of heat engines were fundamental to the development and formulation of the Second Law of Thermodynamics. Moreover, an accurate historical survey clearly reveals that Carnot was, by that time, also well aware about some new concepts, which were further worked out by other scientists to lead to what was, some time later, known as the mechanical equivalent of heat and the conservation of energy. Benoit Paul Émile Clapeyron recognized these original concepts in the first of Carnot´s monographs, published in 1824, but no explicit citation is found in any post-Carnot classical texts dealing with the First Law of Thermodynamics, including those by Julius Robert Mayer, James Prescott Joule and Hermann Ludwig Ferdinand von Helmholtz. The main objective of the present work is to point out some historical evidences of the pioneering contribution of Carnot to the modern concept of the First Law of Thermodynamics.

Síntese de complexo ferro(II)-nitrogênio: abordagem dos conceitos de reatividade e retro-doação para alunos de graduação em química

There has been a considerable interest in coordination complexes of molecular nitrogen (N2), partly due to a possible relationship between such complexes and the nitrogen activation process in nature. The present paper describes the synthesis and infrared spectroscopic characterization of an iron-nitrogen derivative with ethylenediamine-N,N,N',N'-tetraacetate (edta) as an experiment for an undergraduate course. The topics covered here include synthesis, reactivity and spectroscopy.

Laüe back-reflection method for crystallographic orientation of a martensitic Cu-Zn-Al single crystal of the monoclinic system

A martensitic single crystal Cu-23.95Zn-3.62(wt.%)Al alloy was obtained melting pure Cu, Zn and Al using Bridgman's method. The martensitic phase (monoclinic) can present up to 24 variants, and orienting the surface according to a certain plane is a very hard task. The single crystal was submitted to 8 tons of tension (stress) along the longitudinal direction to reduce the number of variants and facilitate the surface orientation according to the desired plane. This single crystal was oriented using the Laüe back-reflection method to give surfaces with the following oriented crystallographic planes: (010), (120) and (130). It was observed that the tension stress was applied along the [010] direction.

Educação ambiental nas escolas da região de Ribeirão Preto (SP): concepções orientadoras da prática docente e reflexões sobre a formação inicial de professores de química

During short courses, 95 secondary school teachers from 49 state schools and 421 students from the Ribeirão Preto region (in Sao Paulo state, Brazil, with a population of 530,000) were asked to fill in different questionnaires. The points raised in the teacher's questionnaire were used as a guide to establish a continuous dialogue during the short courses. Most of the schools claimed to have some kind of environmental education (EE). Based on the questionnaires and dialogues we analyzed how the teachers' perceptions on EE reflect on the views secondary students hold about their own responsibility for preserving the environment. The role of universities in the preparation of chemistry teachers capable of effectively approaching EE is also discussed.

Visões de ciências de professores de química: a mídia e as reflexões no ambiente escolar no nível médio de ensino

The present paper discusses the influence of TV and general media on students scientific ideas and the teacher's perception of this influence on students during class time. 17 high-school chemistry teachers with teaching degree, working in state schools, were interviewed. The interviews showed that both, teachers and students, have a positive opinion of science and the scientist. According to their teachers, students' positive view of science is greatly influenced by TV. The developed study shows how important epistemology is in teachers' college formation to offer them a critical perception of science treated in general media.

O ensino superior de química: reflexões a partir de conceitos básicos para a química orgânica

We live in a context in which knowledge develops continuously and rapidly. This generates a social dynamics that demands constant adaptation from those living in society and also from educational institutions. Education for this new society needs to be rethought. Universities, anchored in tradition, still use a transmission/reception model of education. A data-collecting instrument applied to undergraduate chemistry students at the end of the course in organic chemistry investigated some concepts essential to the education of a chemist, such as interatomic and intermolecular interactions and Lewis structure. We observed that students have difficulty dealing with these concepts, and we believe that this is related to the type of class they had/have and to the way the concepts are presented in the college textbooks.

Patenteamento em nanotecnologia no Brasil: desenvolvimento, potencialidades e reflexões para o meio ambiente e a saúde humana

Nanotechnology developments continue to be produced at exponential rates for a wide and diverse range of applications. In this paper was done a study of technological forecasting in nanotechnology applied to health, based on information drawn in Brazil from 1991 to 2010. The longitudinal evolutions of the number of patent applications, their topics, and their respective patent families have been evaluated for the total global activity. There were obtained 1352 patent applications in this period. It were analyzed the legal nature of the depositors, the year of deposit, depositors' home countries and processes. It has been a goal subsidizes the policy-makers to adapt and modernize the regulatory framework on nanotechnology and risks involving health as a strategic area in the politics of Science.

Reflexões sobre a vaidade dos homens: Hume e Matias Aires

Faz-se uma comparação entre as abordagens de Hume e de Matias Aires no que concerne à vaidade e seus efeitos sobre a vida humana. O propósito é divulgar as idéias do filósofo brasileiro Matias Aires e revelar o que poderia ser uma falha importante na explicação filosófica humiana da experiência religiosa.

Natureza dos deuses e divindade da natureza: reflexões sobre a recepção antiga e moderna do antropomorfismo divino grego

A dificuldade em admitir-se o antropomorfismo dos deuses aparece na Grécia a partir da época arcaica, com os primeiros textos em prosa dos pensadores pré-socráticos. Neste estudo definirei as principais características dessa reflexão crítica sobre os limites do antropomorfismo, bem como a recusa dos intérpretes modernos em aceitar o antropomorfismo grego como uma experiência religiosa autêntica. Alguns fragmentos de Heráclito de Éfeso serão citados como exemplo da sabedoria dos jônios na época arcaica.

A filosofia e seu ensino: reflexões a partir da perspectiva Merleau-Pontyana sobre filosofia e história da filosofia

À pergunta "O estudo de história da filosofia é de algum interesse para a própria filosofia?", diferentes são as respostas. Tomando-se como referência a defesa merleau-pontyana de uma intrínseca relação entre filosofia e história da filosofia e, particularmente, as ideias de Merleau-Ponty contidas no excerto "A Filosofia e o ‘Fora’", o presente artigo procurará subsidiar a tese de um ensino filosófico da filosofia. Objetiva, pois, encontrar argumentos subjacentes à tese de uma história filosófica da filosofia para fundamentar as relações entre a filosofia e seu ensino.

O FILOSOFAR BUDISTA: BREVES REFLEXÕES SOBRE O FAZER FILOSÓFICO E AS SUAS MOTIVAÇÕES

RESUMO Este texto propõe a trazer à tona alguns aspectos dos estudos do budismo e de sua filosofia no Brasil, que têm sido, de alguma forma, negligenciados ou tratados de modo pouco condizente com a proposta com que este filosofar foi inicialmente concebido. Não se trata de convencer ou "converter" acadêmicos brasileiros a pensarem de maneira similar aos eruditos budistas, mas simplesmente destacar pontos que parecem relevantes para dar continuidade a um debate que já vem sendo estabelecido, particularmente na última década. Com este propósito, serão levantadas questões como as motivações e métodos do fazer filosófico, o dogmatismo, a ética e formas de transmissão de conhecimento.

Retaguarda Emocional Para o Aluno de Medicina da Santa Casa de São Paulo (REPAM): realizações e reflexões

Este artigo descreve a experiência de sete anos (1997-2003) do Repam - Retaguarda Emocional para o Aluno de Medicina da Faculdade de Ciências Médicas da Santa Casa de São Paulo -, enfocando especialmente os atendimentos psicoterápicos realizados. Relata o histórico do serviço, os profissionais que o compõem, seus objetivos e atividades desenvolvidas. Apresenta dados quantitativos e qualitativos sobre os atendimentos realizados, a partir de uma análise retrospectiva dos prontuários dos estudantes em psicoterapia durante esse período. Discute a experiência do Repam em relação a outros serviços com os mesmos objetivos, identificando semelhanças e especificidades. Finaliza com reflexões a respeito das vicissitudes deste tipo de trabalho, seus limites e potenciais.