分子法激光分离同位素中的物理化学气体动力学研究

<正> 尽管激光分离同位素(LIS)才出现十几年,但由于其突出优点,受到世界各国的重视,发展极快。其中有大量课题与力学紧密相关,但迄未见到从这两个乍看起来关系不大的学术领域的结合上作出的总结和评述。本文希望填补这一空白。 1.激光同位素分离 从天然矿物或人工产物中将对人类用处较大的同位素分离出来,对于国民经济和军事应用十分重要。例如,天然矿物中铀235的含量只有约0.7％;而世界

Contos da Câmara : depoimentos de servidores nos 180 anos do Legislativo

Reúne depoimentos de servidores da Câmara do Deputados sobre os acontecimentos que marcaram a história do parlamento brasileiro a partir da segunda metade do século XX. Coletados pelo Núcleo de História Oral da Câmara durante as comemorações dos 180 anos do Poder Legislativo em 2003, os textos retratam a realidade dos primeiros anos vividos no Planalto Central: a carência de infra-estrutura, a falta de opção de atividades de lazer e o profundo sentimento de saudade da antiga capital da República. Mas também levam a reminiscências de momentos divertidos, curiosidades e reflexões animadas e esperançosas sobre a mudança da capital para Brasília. O ponto alto são as experiências vivenciadas nos prédios do Congresso Nacional, a lembrança dos amigos, dos colegas e, especialmente, dos fatos marcantes, que sublinham as significativas mudanças nas rotinas de trabalho da Instituição para se adequar à modernização e às novas exigências da sociedade, no contexto de acontecimentos políticos que modificaram seguidas vezes o cenário do país.

一类平板组合结构的杂交有限元解法

<正> 1.引言由几块平板组成的空间结构在工程上得到广泛应用.其动力、静力问题是很难用经典材料力学和弹性力学方法解决的.有限元方法是解决这类问题的强有力手段.各国力学工作者已经发展了很多解决板壳问题的有限元素法,Zienkiewicz 等提出的位移法有限元公式是最常用的,这个元素的位移函数在边界上一阶法向导数不连续是它的最大缺点,另外一些人提出的位移法边界协调元素公式太复杂,而不为人们所

Política nacional de resíduos sólidos

Trata da Lei n. 12.305, de 2 de agosto de 2010, que institui a Política Nacional de Resíduos Sólidos; altera a Lei n° 9.605, de 12 de fevereiro de 1998; e dá outras providências; e legislação correlata

塑性大变形问题的唯一性、稳定性和极值原理

本文从考虑几何非线性的塑性大变形基本方程出发,讨论了塑性大变形问题的唯一性、稳定性与极值原理。提出了确定边值问题的解的唯一性判别准则;分析了平衡状态稳定性的充分条件。最后讨论了边值问题与变分问题等价的充分条件。

Orthotropy rescaling and implications for fracture in composites

For most practically important plane elasticity problems of orthotropic materials, stresses depend on elastic constants through two nondimensional combinations. A spatial rescaling has been found to reduce the orthotropic problems to equivalent problems in materials with cubic symmetry. The latter, under favorable conditions, may be approximated by isotropic materials. Consequently, solutions for orthotropic materials can be constructed approximately from isotropic material solutions or rigorously from cubic ones. The concept is developed to gain insight into the interplay between anisotropy and finite geometry. The inherent simplicity of the solutions allows a variety of technical problems to be addressed efficiently. Included are stress concentration related cracking, effective contraction of orthotropic material specimens, crack deflection onto easy fracture planes, and surface flaw induced delamination.

A closure theory of intermittency of turbulence

The variational approach to the closure problem of turbulence theory, proposed in an earlier article [Phys. Fluids 26, 2098 (1983); 27, 2229 (1984)], is extended to evaluate the flatness factor, which indicates the degree of intermittency of turbulence. Since the flatness factor is related to the fourth moment of a turbulent velocity field, the corresponding higher-order terms in the perturbation solution of the Liouville equation have to be considered. Most closure methods discard these higher-order terms and fail to explain the intermittency phenomenon. The computed flatness factor of the idealized model of infinite isotropic turbulence ranges from 9 to 15 and has the same order of magnitude as the experimental data of real turbulent flows. The intermittency phenomenon does not necessarily negate the Kolmogorov k−5/3 inertial range spectrum. The Kolmogorov k−5/3 law and the high degree of intermittency can coexist as two consistent consequences of the closure theory of turbulence. The Kolmogorov 1941 theory [J. Fluid Mech. 62, 305 (1974)] cannot be disqualified merely because the energy dissipation rate fluctuates.

Manual do deputado : Regimento Interno da Câmara dos Deputados e Constituição da República

Inclui: Regimento Interno da Câmara dos Deputados; Regimento Comum do Congresso Nacional; Regimento Interno do Senado Federal; Constituição da República, de 1946; Lei nº Lei nº 1.305, de 13 de julho de 1951; Lei nº 1.079, de 10 de abril de 1.050, Lei nº 1493, de 13 de dezembro de 1951; Lei nº 2.226, de 12 de julho de 1954; relação de deputados e suplentes.

关于气液两相流流型及其判别的若干问题

气液两相流体系是一个复杂的多变量随机过程体系，流型的定义、流型过渡准则和判别方法等方面的研究是多相流学科目前研究的重点内容。本文就与气液两相流流型及其判别有关的研究状况进行了回顾和评述，力图反映近年来气液两相流流型及其判别问题研究的状态和趋势。

Licenciamento ambiental de minerações em Minas Gerais : novas abordagens de gestão

Objetiva estudar o sistema de licenciamento e pós-licenciamento ambiental, com foco nas atividades minerárias do estado de Minas Gerais. Como marco referencial, analisa-se a evolução das políticas públicas, em especial as de meio ambiente e do sistema de licenciamento ambiental - instrumento mais efetivo dessas políticas - bem como questões atinentes à mineração sustentável. Como temas centrais, são avaliadas as etapas de licenciamento e pós-licenciamento do sistema implantado em Minas Gerais, incluindo seu histórico, arcabouço jurídico, recentes modificações e resultados até hoje obtidos no que tange especificamente às atividades minerárias, de significativa relevância na economia do estado.

Number of prior episodes and the presence of depressive symptoms are associated with longer length of stay for patients with acute manic episodes

Background: Few studies have analyzed predictors of length of stay (LOS) in patients admitted due to acute bipolar manic episodes. The purpose of the present study was to estimate LOS and to determine the potential sociodemographic and clinical risk factors associated with a longer hospitalization. Such information could be useful to identify those patients at high risk for long LOS and to allocate them to special treatments, with the aim of optimizing their hospital management. Methods: This was a cross-sectional study recruiting adult patients with a diagnosis of bipolar disorder (Diagnostic and Statistical Manual of Mental Disorders, 4th edition, text revision (DSM-IV-TR) criteria) who had been hospitalized due to an acute manic episode with a Young Mania Rating Scale total score greater than 20. Bivariate correlational and multiple linear regression analyses were performed to identify independent predictors of LOS. Results: A total of 235 patients from 44 centers were included in the study. The only factors that were significantly associated to LOS in the regression model were the number of previous episodes and the Montgomery-Åsberg Depression Rating Scale (MADRS) total score at admission (P < 0.05). Conclusions: Patients with a high number of previous episodes and those with depressive symptoms during mania are more likely to stay longer in hospital. Patients with severe depressive symptoms may have a more severe or treatment-resistant course of the acute bipolar manic episode.