El sistema de educaci??n de G??mez de Pi??eyra, una muestra de la presencia lockeana en la pedagog??a espa??ola de principios del siglo XIX

Resumen tomado de la publicaci??n

Anharmonicity contributions to the vibrational second hyperpolarizability of conjugated oligomers

Restricted Hartree-Fock 6-31G calculations of electrical and mechanical anharmonicity contributions to the longitudinal vibrational second hyperpolarizability have been carried out for eight homologous series of conjugated oligomers - polyacetylene, polyyne, polydiacetylene, polybutatriene, polycumulene, polysilane, polymethineimine, and polypyrrole. To draw conclusions about the limiting infinite polymer behavior, chains containing up to 12 heavy atoms along the conjugated backbone were considered. In general, the vibrational hyperpolarizabilities are substantial in comparison with their static electronic counterparts for the dc-Kerr and degenerate four-wave mixing processes (as well as for static fields) but not for electric field-induced second harmonic generation or third harmonic generation. Anharmonicity terms due to nuclear relaxation are important for the dc-Kerr effect (and for the static hyperpolarizability) in the σ-conjugated polymer, polysilane, as well as the nonplanar π systems polymethineimine and polypyrrole. Restricting polypyrrole to be planar, as it is in the crystal phase, causes these anharmonic terms to become negligible. When the same restriction is applied to polymethineimine the effect is reduced but remains quantitatively significant due to the first-order contribution. We conclude that anharmonicity associated with nuclear relaxation can be ignored, for semiquantitative purposes, in planar π-conjugated polymers. The role of zero-point vibrational averaging remains to be evaluated

Basis set and electron correlation effects on initial convergence for vibrational nonlinear optical properties of conjugated organic molecules

The level of ab initio theory which is necessary to compute reliable values for the static and dynamic (hyper)polarizabilities of three medium size π-conjugated organic nonlinear optical (NLO) molecules is investigated. With the employment of field-induced coordinates in combination with a finite field procedure, the calculations were made possible. It is stated that to obtain reasonable values for the various individual contributions to the (hyper)polarizability, it is necessary to include electron correlation. Based on the results, the convergence of the usual perturbation treatment for vibrational anharmonicity was examined

Aplicacions i mecanisme de la reacció d'hidroesterificació d'olefines. Compatibilització fibramatriu en poliolefines reforçades amb fibra de pi

En la primera part del present treball es presenta la investigació duta a terme sobre la reacció d'hidroesterificació d'olefines. S'analitzen els factors que afecten la reactivitat i quimioselectivitat de les reaccions d'hidroesterificació i deuterioesterificació en sistemes catalítics basats en complexes de pal·ladi amb lligands auxiliars de tipus fosfina. Es presenta un estudi detallat del mecanisme catalític a través del qual tenen lloc aquestes reaccions. La determinació del mecanisme de reacció ha estat aplicada a la obtenció d'una versió enantioselectiva de la mateixa. En una segona part del treball s'han analitzat diversos sistemes de modificació superficial de fibres naturals i el seu efecte sobre la compatibilitat fibra - matriu en materials compòsits de matriu poliolefínica. S'han caracteritzat les propietats superficials de fibres de pi químicament modificades. Les fibres naturals modificades s'han utilitzat en la preparació de materials compòsits, les propietats mecàniques, tèrmiques i termomecàniques dels quals han estat caracteritzades i analitzades.

Educação física na 4ª série do ensino fundamental das escolas Governador Freitas Neto e Colégio Lerote da cidade de Teresina-PI : a relação entre leitura e expressão corporal

RESUMO:O hábito de ler é decorrente do exercício e nem sempre se constitui num ato prazeroso, porém, sempre necessário. Por este motivo se deve recorrer a estímulos para criar o hábito de leitura em nossos alunos. Desta forma, a disciplina de Educação Física pode também contribuir para este processo. Por ser uma disciplina que envolve a dimensão motora, cognitiva e expressionista, a sua relação com a leitura é quase que intrínseca, porém, viabilizada de formas diferentes. É certo que a criança não conseguirá na sua totalidade, uma absorção intelectual explícita da leitura para construir uma realidade virtual e representar em gestos corporais, a partir de um conjunto léxico de significantes e significados correspondentes à postura física. No entanto, o exercício da leitura desenvolve na criança capacidades cognitivas de mais valia que lhe possibilita níveis satisfatórios de representatividade corporal. As atividades recreativas oferecem, sem dúvida, um processo excepcional para fazer as crianças tomarem parte ativamente no processo do ensino, como participantes, em vez de meros espectadores. A proposta deste trabalho de intervenção busca auxiliar o professor de Educação Física no campo de atuação profissional do pesquisador, tendo como delimitação do campo de investigação o Centro de Educação Básica Governador Freitas Neto, escola da rede municipal de Educação de Teresina e, Colégio Lerote, da rede particular de Teresina. Deste modo, os objetivos do presente estudo consistem em analisar as contribuições da disciplina de Educação Física para a aprendizagem do ensino da prática de leitura com crianças do Ensino Fundamental, nas séries iniciais com escolas da rede municipal e particular da cidade de Teresina – Piauí. Concluiu-se que com um trabalho integrado da Educação Física com o processo de alfabetização nas primeiras séries do Ensino Fundamental, essa etapa pode ser vista de forma rica e ampla. Assim, com essa contribuição, aprender a ler e escrever pode, pois, se tornar mais natural e mais divertido. ABSTRACT: The habit of reading is a result of exercise and is not always a pleasurable act, but always necessary. For this reason one should resort to incentives to create the reading habit in our students. Thus, the discipline of Physical Education can also contribute to this process. Because it is a discipline that involves the size motor, cognitive and expressionistic, their relationship with reading that is almost inherent, however, made possible in different ways. It is true that the child can not in its entirety, an explicit intellectual absorption of reading to construct a virtual reality and represented body gestures from a whole lexicon of signifiers and meanings corresponding to the physical posture. However, the exercise of reading the child develops cognitive abilities that enables him to gain more satisfactory levels of representative body. The recreational activities offer, no doubt, an exceptional procedure to make the children take part actively in the process of education, as participants rather than spectators. The purpose of this intervention work intends to help the physical education teacher in the professional field of research, with the delimitation of the field of research the Centre for Basic Education Governador Freitas Neto, the municipal school of Teresina and Education, College Lerote, from private Teresina. Thus, the objectives of this study are to analyze the contributions of physical education for learning the practice of teaching reading with children of elementary school, in the early grades with municipal schools and particularly the city of Teresina - Piauí. It was concluded that with an integrated physical education with the acquisition of literacy in the early grades of elementary school, this step can be seen in a rich and broad. So, with this contribution, learning to read and write may therefore become more natural and fun.

Orientação sexual como tema transversal em escolas públicas de Curralinhos-PI

Este estudo objetivou analisar a prática docente relacionada à orientação sexual enquanto tema transversal em escolas públicas no munícipio de Curralinhos-PI, e neste encalço, identificar as formas de práticas docentes relacionadas à orientação sexual enquanto tema transversal; caracterizar os fatores condicionantes para a realização da abordagem da orientação sexual em sala de aula; verificar a contribuição das oficinas do Programa Saúde e Prevenção na Escola (SPE) na formação continuada da prática docente e, a percepção de professores e alunos, quanto à relevância da abordagem do tema em questão de forma sistemática e transversal nas referidas escolas. Trata-se de um estudo com abordagem qualitativa e quantitativa com função de complementaridade, realizada em duas escolas públicas (X e Y) do município de Curralinhos-PI, de ensino fundamental e ensino médio, respectivamente, envolvendo uma amostra de 8 (oito) professores, que participaram das oficinas do SPE e 116 alunos, sendo 54 da escola X e 62 da escola Y. Os instrumentos da coleta de dados foram a entrevista e o questionário semiestruturados, originários de um roteiro de questões-guia. A coleta de dados foi realizada no segundo semestre de 2011, nos meses de agosto a setembro. Os resultados apontaram que é grande a necessidade de se discutir e implementar a orientação sexual no espaço escolar, pois embora a maioria dos professores entrevistados reconheçam a importância de se trabalhar a orientação sexual como tema transversal e demonstrarem conhecer esta proposta dos Parâmetros Curriculares Nacionais (PCNs), ainda são difusas as práticas incorporadas em suas atividades pedagógicas. Quanto aos alunos, evidenciaram que ainda se fazem presentes dúvidas e angústias, assim como dificuldades para a lida com o tema da sexualidade.

Synthesis and characterization of thermally stable second-order nonlinear optical side-chain polyimides containing thiazole and benzothiazole push-pull chromophores

Push-pull nonlinear optical (NLO) chromophores containing thiazole and benzothiazole acceptors were synthesized and characterized. Using these chromophores a series of second-order NLO polyimides were Successfully prepared from 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), pyromellitic dianhydride (PMDA) and 3,3'4,4'-benzophenone tetracarboxylic dianhydride (BTDA) by a standard condensation polymerization technique. These polyimides exhibit high glass transition temperatures ranging from 160 to 188 degrees C. UV-vis spectrum of polyimide exhibited a slight blue shift and decreases in absorption due to birefringence. From the order parameters, it was found that chromophores were aligned effectively. Using in situ poling and temperature ramping technique, the optical temperatures for corona poling were obtained. It was found that the optimal temperatures of polyimides approach their glass transition temperatures. These polyimides demonstrate relatively large d(33) values range between 35.15 and 45.20 pm/V at 532 nm. (C) 2008 Elsevier B.V. All rights reserved.

Enantioselective Intramolecular Michael Addition of Nitronates onto Conjugated Esters: Access to Cyclic γ-Amino Acids with up to Three Stereocenters

A highly stereoselective synthesis of conformationally constrained cyclic γ-amino acids has been devised. The key step involves an intramolecular cyclization of a nitronate onto a conjugated ester, promoted by a bifunctional thiourea catalyst. This methodology has been successfully applied to generate a variety of γ-amino acids, including some containing three contiguous stereocenters, with very high diastereoselectivity and excellent enantioselectivity. It is postulated that an interaction that is key to the success of the process is the simultaneous coordination of the thiourea functionality to both the conjugated ester and the nitronate. Finally, the synthetic utility of these compounds is demonstrated in the synthesis of two dipeptides derived from the C- and N-termini.

Incorporation of cis-9,trans-11 or trans-10,cis-12 conjugated linoleic acid into plasma and cellular lipids in healthy men

This study investigated the incorporation of cis-9,trans-11 conjugated linoleic acid (c9,t11 CLA) and trans-10,cis-12-CLA (t10,c12 CLA) into plasma and peripheral blood mononuclear cell (PBMC) lipids when consumed as supplements highly enriched in these isomers. Healthy men (n = 49, age 31 +/- 8 years) consumed one, two, and four capsules containing similar to600 mg of either c9,t11 CIA or t10,c12 CLA per capsule for sequential 8 week periods followed by a 6 week washout before consuming the alternative isomer. Both isomers were incorporated in a dosedependent manner into plasma phosphatidylcholine (PC) (c9,t11 CLA r = 0.779, t10,c12 CLA r = 0.738; P < 0.0001) and cholesteryl ester (CE) (c9,t11 CLA r = 0.706, t10,c12 CLA r = 0.788; P < 0.0001). Only t10,c12 CLA was enriched in plasma nonesterified fatty acids. Both c9,t11 CIA and t10,c12 CLA were incorporated linearly into PBMC total lipids (r = 0.285 and r = 0.273, respectively; P < 0.0005). The highest concentrations of c9,t11 CLA and t10,c12 CLA in PBMC lipids were 3- to 4-fold lower than those in plasma PC and CE. These data suggest that the level of intake is a major determinant of plasma and PBMC CLA content, although PBMCs appear to incorporate both CLA isomers less readily.