System for ampacity monitoring and low sag overhead conductor evaluation

MELECON 2012 - 2012 16th IEEE Mediterranean Electrotechnical Conference, 25 Mar - 28 Mar 2012, Túnez

新型可控坍塌芯片连接技术(C4)及芯下材料力学性能研究进展

可控坍塌芯片连接 (C4)技术可以实现高速、高密度、小外形的封装 ,因此日渐得到关注和发展。然而 ,随着C4技术的普及 ,C4封装内由于芯片和基板间热膨胀系数 (CTE)的不匹配而引起的可靠性问题将日益突出 ,为此研究者在C4封装中引入芯下材料来提高C4封装的可靠性。文中侧重于制造工艺、可靠性以及最新进展对C4技术进行介绍 ,并且对C4技术中所用的芯下材料的力学性能及其对C4封装可靠性影响的研究现状进行评述

Diário da Constituinte [gravação de vídeo] : [programa n. 617]

A emenda da anistia aos microempresários ganha um novo texto que poderá facilitar o acordo para a votação. O primeiro turno deve acabar na próxima semana. Na sessão de ontem foram aprovados três temas importantes. Uma das emendas aprovadas, com 319 votos, é que todos os incentivos fiscais concedidos pela União, estados e municípios serão revistos e poderão ser extintos caso a lei venha considerar que esses incentivos não sejam mais válidos. Foi aprovada a emenda que retira a obrigatoriedade da contribuição sindical. A contribuição só poderá ser definida entre os sindicatos e os empregados. Foi aprovada uma fusão de emendas estabelecendo uma lei agrícola para o país. Os autores da emenda da anistia aos microempresários fizeram um novo texto para facilitar o acordo e a votação da próxima semana. Será anistiada a correção monetária aos micro e pequenos empresários urbanos que fizeram empréstimo entre 28 de fevereiro de 1986 a 31 de dezembro de 1987 e aos pequenos e médios que conseguiram o crédito nesse mesmo período. São classificados como pequenos empresários aqueles que tiveram como receita anual máxima cinco mil OTNS. Os médios empresários serão classificados se tiveram a receita anual máxima de quinze mil OTNS. O novo texto dez que a anistia será concedida se a liquidação dos débitos for feita no prazo de 180 dias a partir da promulgação da nova constituição. E não será excluído o pagamento do débito inicial, acrescido dos juros e taxas. O presidente da constituinte, Ulysses Guimarães, acredita que na próxima semana aconteça o fim do primeiro turno de votação.

求解运动方程的一种不等时间步长的显式数值积分方法

在波动有限元模拟中, 若采用传统的显式数值积分方法求解运动方程, 计算时间步长需采用计算区内满足稳定条件要求的最小时间步长. 然而, 对于大部分计算区域, 这一时间步长过小, 是不必要的. 本文提出了一种不等时间步长的显式数值积分方法, 其基本思想是不同的计算区域采用满足各自稳定条件的计算时间步长. 最后, 本文通过数值试验检验了这一方法的可行性及其对数值计算精度的影响.

Dynamic optimization of track components to minimize rail corrugation

In this paper, the influence on corrugation of the most significant track parameters has been examined. After this parametric study, the optimization of the track parameters to minimize the undulatory wear growth has been achieved. Finally, the influence of the dispersion of the track and contact parameters on corrugation growth has been studied. A method has been developed to obtain an optimal solution of the track parameters which minimizes corrugation growth, thus ensuring that this solution remains optimum despite dispersion of track parameters and wheel-rail contact uncertainties. This work is based on the computer application RACING (RAil Corrugation INitiation and Growth) which has been developed by the authors to predict rail corrugation features.

可压缩轴对称射流三维拟序结构的演化

采用高精度差分方法对空间发展轴对称可压缩射流流场进行直接数值模拟，计算结果显示了射流失稳后首先出现Kelvin-Helmholtz非稳定特征，流动的进一步发展，非线性效应的增长导致轴对称涡环的二次失稳和流向涡的产生，并给出了拟序结构的三维演化过程，计算结果证实了轴对称射流中二闪失稳，流向涡的产生是增强流动混合及流动产生转捩的重要机制。

冲击载荷下饱和砂土渗流和破坏的实验研究

对饱和砂土在冲击载荷下发现的变形和流动效应进行了落锤模拟实验研究，发现砂土骨架出现纵向排水通道和横向断裂等现象，对可能影响这些现象的主要因素进行了对比的实验，对上述实验现象进行了初步的解释。

Collecção das Leis da Republica dos Estados Unidos do Brazil de 1908

Parte 1 - Atos do Poder Legislativo.

Egg production, spawning biomass and factors influencing recruitment of striped bass in the Potomac River and the upper Chesapeake Bay

Ichthyoplankton surveys in the Potomac River and Upper Chesapeake Bay were carried out in 1989 to estimate striped bass egg productions, age specific spawning biomasses of adult females, cohort-specific larval growth and mortality rates, and hatch dates of 8.0 mm larvae survivors. Possible consequences to recruitment of environmental factors were examined in 1989 and for data collected in 1987-1988. The temporal and spatial occurrences and distributions of eggs and larvae In both spawning areas are described and discussed in relation to environmental factors (temperature, rainfall, river discharge, pH, conductivity, zooplankton abundances) (PDF contains 319 pages)

Davidson Seamount Taxonomic Guide

Davidson Seamount is one of the largest seamounts in U.S. waters and the first to be characterized as a “seamount.” In 2002 and 2006, the Monterey Bay National Marine Sanctuary (MBNMS) led two multi-institutional expeditions to characterize the geology and natural history of Davidson Seamount. Results from these expeditions to Davidson Seamount are adding to the scientific knowledge of seamounts, including the discovery of new species. In November 2008, the MBNMS boundary was expanded to include the Davidson Seamount. In addition, a management plan for Davidson Seamount was created to develop resource protection, education, and research strategies for the area. The purpose of this taxonomic guide is to create an inventory of benthic and mid-water organisms observed at the Davidson Seamount to provide a baseline taxonomic characterization. At least 237 taxa were observed and are presented in this guide; including 15 new or undescribed species (8 sponges, 3 corals, 1 ctenophore, 1 nudibranch, 1 polychaete, 1 tunicate) recently or currently being described by taxonomic experts. This is the first taxonomic guide to Davidson Seamount, and is intended to be revised in the future as we learn more about the seamount and the organisms that live there. (PDF has 145 pages.)

Distribution of fishing effort and resulting tuna catches from the Eastern Tropical Pacific by quarters of the year, 1951-1958

ENGLISH: This is a data report based on information collected from the logbooks of baitboats and purse-seiners engaged in the fishery for yellowfin (Neothunnus macropterus) and skipjack (Katsulvonus pelamis) tuna in the Eastern Tropical Pacific Ocean from 1951 through 1958. The detailed analysis of these data appears in other research bulletins, some already published and others in preparation. SPANISH: Este es un informe basado en los datos contenidos en la información recogida de los registros de bitácora de los barcos de carnada y rederos que se dedicaron a la pesca de atún aleta amarilla (Neothunnus macropterus) y barrilete (Katsuwonus pelamis) en el Océano Pacífico Oriental Tropical de 1951 a 1958. El análisis detallado de estos datos aparece en otros boletines de investigación, algunos de los cuales ya han sido publicados y otros están en preparación.

Un nuevo Lorca alemán: por ejemplo Bodas de Sangre y La Casa de Bernarda Alba

Eterio Pajares, Raquel Merino y José Miguel Santamaría (eds.)

Interpretazioaren ikerketa-erronka berriak

Raquel Merino Álvarez, José Miguel Santamaría, Eterio Pajares (eds.)

Adiabatic shear localization: occurrence, theories, and applications