993 resultados para 12-114
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The political campaign before Germany’s parliamentary elections to be held on 22 September has in all its glory reflected the trends visible during the last four years of the government of Chancellor Angela Merkel – the strength of the Christian Democrats, the weakness of the opposition and the increasing marginalisation of the coalition partner, the FDP. The CDU/CSU remains the most popular political choice in Germany, largely because Angela Merkel has consistently remained the most popular German politician. Everything indicates that the CDU/CSU will win the election, even though it has been running a passive campaign and the Chancellor herself has been avoiding confrontation, presenting herself as a kind of cross-party representative of the interests of all social groups. The Christian Democrats’ main competitors, the Social Democrats, have been unable to play to their strengths and present themselves as a serious alternative to the CDU/CSU. The Christian Democrats, despite their difficult cooperation with the liberal FDP, have declared their willingness to continue doing so during the next parliamentary term. If the numbers make that impossible, and the Social Democrats and the Greens have too few votes to be able to form a government, a grand coalition of the Christian Democrats and the SPD will be formed in Germany.
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The thermally driven Structural phase transition in the organic-inorganic hybrid perovskite (CnH2n+1NH3)(2)PbI4 has been investigated using molecular dynamics (MD) simulations. This system consists of positively charged alkyl-amine chains anchored to a rigid negatively charged PbI4 sheet with the chains organized as bilayers with a herringbone arrangement. Atomistic simulations were performed using ail isothermal-isobaric ensemble over a wide temperature range from 65 to 665 K for different alkyl chain lengths, n = 12, 14, 16, and 18. The simulations are able to reproduce the essential Features of the experimental observations of this system, including the existence of a transition, the linear variation of the transition temperature with alkyl chain length, and the expansion of the bilayer thickness at the transition. By use of the distance fluctuation Criteria, it is Shown that the transition is associated With a Melting of the alkyl chains of the anchored bilayer. Ail analysis of the conformation of the alkyl chains shows increased disorder in the form of gauche defects above due melting transition. Simulations also show that the melting transition is characterized by the complete disappearance of all-trans alkyl chains in the anchored bilayer, in agreement with experimental observations. A conformationally disordered chain has a larger effective cross-sectional area, and above due transition a uniformly tilted arrangement of the anchored chains call no longer be Sustained. At the melt the angular distribution of the orientation of the chains are 110 longer uniform; the chains are splayed allowing for increased space for individual chains of the anchored bilayer. This is reflected in a sharp rise in the ratio of the mean head-to-head to tail-to-tail distance of the chains of the bilayer at the transition resulting in in expansion of the bilayer thickness. The present MD simulations provide a simple explanation as to how changes in conformation of individual alkyl-chains gives rise to the observed increase in the interlayer lattice spacing of (CnH2n+1NH3)(2)PbI4 at the melting transition.
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Supercritical carbon dioxide is used to prepare aerogels of two reference molecular organogelators, 2,3-bis-n-decyloxyanthracene (DDOA) (luminescent molecule) and 12-hydroxystearic acid (HSA). Electron microscopy reveals the fibrillar morphology of the aggregates generated by the protocol. SAXS and SANS measurements show that DDOA aerogels are crystalline materials exhibiting three morphs: (1) arrangements of the crystalline solid (2D p6m), (2) a second hexagonal morph slightly more compact, and (3) a packing specific of the fibers in the gel. Aggregates specific of the aerogel (volume fraction being typically phi approximate to 0.60) are developed over larger distances (similar to 1000 angstrom) and bear fewer defaults and residual strains than aggregates in the crystalline and gel phases. Porod, Scherrer and Debye-Bueche analyses of the scattering data have been performed. The first five diffraction peaks show small variations in position and intensity assigned to the variation of the number of fibers and their degree of vicinity within hexagonal bundles of the related SAFIN according to the Oster model. Conclusions are supported by the guidelines offered by the analysis of the situation in HSA aerogels for which the diffraction pattern can be described by two coexisting lamellar-like arrangements. The porosity of the aerogel, as measured by its specific surface extracted from the scattering invariant analysis, is only 1.8 times less than that of the swollen gel and is characteristic of a very porous material.
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A Assembleia Nacional Constituinte (ANC) propõe ao idoso aposentadoria integral, com valor igual ao maior salário do último ano de trabalho. Arnaldo Faria de Sá (PTB-SP) concorda com a proposta. Eduardo Moreira (PMDB-SC) diz que o aposentado será lembrado nesta Constituição, de tal forma que mantenha seu poder aquisitivo. Com relação ao tempo de serviço necessário para a aposentadoria, não houve inovações. Geraldo Alckmin (PMDB-SP) diz que a Constituinte estabeleceu o Sistema Único de Previdência Social e o Sistema Único de Saúde, através do INAMPS, para fazer justiça ao trabalhador rural e fixar o homem no campo. Na sessão O Povo Pergunta, cidadão quer saber o que os constituintes vão fazer em relação a pobreza. Ruberval Piloto (PDS-SC) responde que, para sanar a pobreza, é necessário dar um salário mais justo para a parte menos assistida da população, garantir cidadania social (casa, terra e comida) e melhor distribuição de renda entre a União, Estados e Municípios. A Comissão de Sistematização realizou a primeira reunião para discutir o anteprojeto de Constituição. A ausência do Relator Bernardo Cabral (PMDB-AM) impediu a discussão do anteprojeto. José Genoíno (PT-SP) diz que é impossível discutir o anteprojeto sem o relatório. José Richa (PMDB-PR) relata que o anteprojeto está fora da realidade, como é o caso da estabilidade no emprego após 90 dias de trabalho. Vivaldo Barbosa (PDT-RJ) está preocupado com alguns temas, como a questão do direito de propriedade e da reforma agrária. Nelson Jobim (PMDB-RS) explica que o anteprojeto é uma síntese do que foi aprovado nas comissões e, neste momento, não é possível fazer alterações.
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扩展了YGa3B4O12的合成温度。研究了合成温度的改变及Cr3+离子引入后发光性质的变化。合成YGa3-xCrxB4O12化合物后,对其磁学性质进行了表征。结果表明,高温合成该化合物有利于化合物荧光发射的增强,掺杂少量Cr3+可以稳定该化合物的结构并改变其发光光谱。磁化率随Cr3+含量的增加而增大。
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Servicios registrales
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Servicios registrales
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1. Aspectos de la evolución reciente de los mercados laborales de América Latina y el Caribe / Jürgen Weller .-- 2. Participación del ingreso laboral en el ingreso total en América Latina, 1990-2010 / Martín Abeles, Verónica Amarante y Daniel Vega .-- 3. América Latina: productividad total de los factores y su descomposición / Jair Andrade Araujo, Débora Gaspar Feitosa y Almir Bittencourt da Silva .-- 4. Restricciones financieras del desarrollo económico: teoría y políticas para los países en desarrollo / Jennifer Hermann .-- 5. La incursión de China en el Tratado de Libre Comercio de América del Norte (tlcan) y sus efectos en el comercio intraindustrial / Jorge Alberto López A., Óscar Rodil M. y Saúl Valdez G. .-- 6. Trabajo, familia y cambios en la política pública en América Latina: equidad, maternalismo y corresponsabilidad / Merike Blofield y Juliana Martínez F. .-- 7. Impacto del tipo de cambio real en los sectores industriales de Colombia: una primera aproximación / Lya Paola Sierra y Karina Manrique L. .-- 8. Inserción global, desarticulación y competitividad en el sector electromecánico de México: un análisis estructural / Raúl Vázquez López .-- 9. Construyendo capacidades tecnológicas en escenarios inestables: empresas manufactureras argentinas y brasileñas / Anabel Marín, Lilia Stubrin y María Amelia Gibbons .-- 10. Índice de inestabilidad política del Brasil, 1889-2009 / Jaime Jordan Costantini y Mauricio Vaz Lobo Bittencourt.
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Aspects of recent developments in the Latin American and Caribbean labour markets / Jürgen Weller .-- The earnings share of total income in Latin America, 1990-2010 / Martín Abeles, Verónica Amarante and Daniel Vega .-- Latin America: Total factor productivity and its components / Jair Andrade Araujo, Débora Gaspar Feitosa and Almir Bittencourt da Silva .-- Financial constraints on economic development: Theory and policy for developing countries / Jennifer Hermann .-- The impact of China’s incursion into the North American Free Trade Agreement (NAFTA) on intra-industry trade / Jorge Alberto López A., Óscar Rodil M. and Saúl Valdez G. .-- Work, family and public policy changes in Latin America: Equity, maternalism and co-responsibility / Merike Blofield and Juliana Martínez F. .-- A first approach to the impact of the real exchange rate on industrial sectors in Colombia / Lya Paola Sierra and Karina Manrique L. .-- Global integration, disarticulation and competitiveness in Mexico’s electromechanical sector: A structural analysis / Raúl Vázquez López .-- Technological capacity-building in unstable settings: Manufacturing firms in Argentina and Brazil / Anabel Marín, Lilia Stubrin and María Amelia Gibbons .-- Index of political instability in Brazil, 1889-2009 / Jaime Jordan Costantini and Mauricio Vaz Lobo Bittencourt
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)