993 resultados para 90-03-PC1


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今年12月11日是国际著名力学家,我国近代力学的奠基人,我国航天技术的开创者和系统工程科学家,中国力学学会和中国空气动力学学会的创始人,钱学森先生的90华诞.中国力学学会和中国空气动力学学会等21个单位举办“新世纪力学研讨会──钱学森技术科学思想的回顾与展望”会议,重温他发展力学的丰富思想,共同探讨我国新世纪力学的前进道路.本期刊出《钱学森先生简介》、郑哲敏院士的《祝贺钱学森院士90寿辰》以及研讨会的3篇大会报告,以表示对钱学森先生90华诞的祝贺。

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[EN]Forty feedlot steers were fed a barleygrain-based finishing diet typical for western Canada, with two levels of supplementary vitamin E (468 or 1068 IU head_1 d_1) and the effect on backfat trans-18:1 isomeric profile was determined. Feeding 1068 IU vitamin E reduced the total trans-18:1 content in backfat (P<0.01), as well as the percentage of trans 10-18:1 (P<0.001), which are related to an increased risk for cardiovascular diseases. On the other hand, trans 11-18:1 (vaccenic acid) the precursor for cis 9,trans 11- 18:2 (rumenic acid), which have several purported health benefits, increased (P<0.01). Vitamin E could, therefore, be used to decrease trans-18:1 in beef and improve its isomeric profile.

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储层介质变形分为弹性变形、塑性变形和弹塑性变形 3种类型 .重点研究了介质塑性变形后地层孔隙度和渗透率变化条件下的不稳定渗流问题 .建立了孔隙度、渗透率指数变化规律的试井分析模型 ,通过有限元方法得到了井底压力随时间变化的双对数理论曲线 ,并对理论曲线的特征进行了分析 .通过实际井例分析 ,说明变孔渗试井模型具有较好的应用效果

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[ES] La creación escultórica en el País Vasco durante los años noventa se siguió nutriendo del entramado creativo de la década anterior, mientras se iban difuminando los últimos coletazos programáticos de la posmodernidad. Los jóvenes artistas de esta última década no plantean lenguajes originales, ni plantean la búsqueda de temáticas inéditas, simplemente se aboga por ubicarse en un marco espacial y temporal que les permita seguir creando en base a procesos anteriores, pero con perspectivas que les sirvan para analizar y experimentar las situaciones enclavadas en el presente.

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Habitat mapping and characterization has been defined as a high-priority management issue for the Olympic Coast National Marine Sanctuary (OCNMS), especially for poorly known deep-sea habitats that may be sensitive to anthropogenic disturbance. As a result, a team of scientists from OCNMS, National Centers for Coastal Ocean Science (NCCOS), and other partnering institutions initiated a series of surveys to assess the distribution of deep-sea coral/sponge assemblages within the sanctuary and to look for evidence of potential anthropogenic impacts in these critical habitats. Initial results indicated that remotely delineating areas of hard bottom substrate through acoustic sensing could be a useful tool to increase the efficiency and success of subsequent ROV-based surveys of the associated deep-sea fauna. Accordingly, side scan sonar surveys were conducted in May 2004, June 2005, and April 2006 aboard the NOAA Ship McArthur II to: (1) obtain additional imagery of the seafloor for broader habitat-mapping coverage of sanctuary waters, and (2) help delineate suitable deep-sea coral/sponge habitat, in areas of both high and low commercial-fishing activities, to serve as sites for surveying-in more detail using an ROV on subsequent cruises. Several regions of the sea floor throughout the OCNMS were surveyed and mosaicked at 1-meter pixel resolution. Imagery from the side scan sonar mapping efforts was integrated with other complementary data from a towed camera sled, ROVs, sedimentary samples, and bathymetry records to describe geological and biological (where possible) aspects of habitat. Using a hierarchical deep-water marine benthic classification scheme (Greene et al. 1999), we created a preliminary map of various habitat polygon features for use in a geographical information system (GIS). This report provides a description of the mapping and groundtruthing efforts as well as results of the image classification procedure for each of the areas surveyed. (PDF contains 60 pages.)

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Executive Summary: Circulation and Exchange of Florida Bay and South Florida Coastal Waters The coastal ecosystem of South Florida is comprised of distinct marine environments. Circulation of surface waters and exchange processes, which respond to both local and regional forcings, interconnect different coastal environments. In addition, re-circulating current systems within the South Florida coastal ecosystem such as the Tortugas Gyre contribute to retention of locally spawned larvae. Variability in salinity, chlorophyll, and light transmittance occurs on a wide range of temporal and spatial scales, in response to both natural forcing, such as seasonal precipitation and evaporation and interannual “El Niño” climate signals, and anthropogenic forcing, such as water management practices in south Florida. The full time series of surface property maps are posted at www.aoml.noaa.gov/sfp. Regional surface circulation patterns, shown by satellite-tracked surface drifters, respond to large-scale forcing such as wind variability and sea level slopes. Recent patterns include slow flow from near the mouth of the Shark River to the Lower Keys, rapid flow from the Tortugas to the shelf of the Carolinas, and flow from the Tortugas around the Tortugas Gyre and out of the Florida Straits. The Southwest Florida Shelf and the Atlantic side of the Florida Keys coastal zone are directly connected by passages between the islands of the Middle and Lower Keys. Movement of water between these regions depends on a combination of local wind-forced currents and gravitydriven transports through the passages, produced by cross-Key sea level differences on time scales of several days to weeks, which arise because of differences in physical characteristics (shape, orientation, and depth) of the shelf on either side of the Keys. A southeastward mean flow transports water from western Florida Bay, which undergoes large variations in water quality, to the reef tract. Adequate sampling of oceanographic events requires both the capability of near real-time recognition of these events, and the flexibility to rapidly stage targeted field sampling. Capacity to respond to events is increasing, as demonstrated by investigations of the 2002 “blackwater” event and a 2003 entrainment of Mississippi River water to the Tortugas. (PDF contains 364 pages.)

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《固体力学进展及应用:庆贺李敏华院士90华诞文集》收录了近代固体力学基础理论及其应用领域的重要科技成果和最新进展。作者是在同体力学领域工作多年的资深研究员,他们来自各行各业,有丰富的科研与丁作经验。他们提供的论文在相当程度上反映当前同体力学的发展现状与成就,并能看出发展趋势,对未来研究的课题选择有参考价值。《固体力学进展及应用:庆贺李敏华院士90华诞文集》还收集了李敏华院士的珍贵照片和纪念李敏华院士90华诞的庆贺和回忆文章,具有重要的史料价值。

目录

学术论文
星际超高速公路网
塑性波、动态屈服准则和动态塑性本构关系
LURR's twenty years and its perspective
铜晶体循环形变的晶体学取向特征
损伤、界面与材料强韧化
散斑方法用于疲劳问题研究
微薄梁三点弯曲尺度效应的理论分析
三峡坝区电力设施及水工建筑物在工程爆破引发振动激励下的动力安全评估
基尼系数的估算方法
颗粒增强复合材料的残余热应力分析和增韧效应
先进复合材料及其在航空航天中应用
我国船舶水弹性力学研究的部分进展
车桥耦合系统随机振动的虚拟激励分析
SHPB系统高温实验自动组装技术
Research on performance indices ofvibration isolation system
Dynamic testing of materials with the rotating disk indirect bar-bar tensile impact apparatus
先进复合材料层合板壳的自由振动分析
任意线法
阿基米德原型桥的动力响应
Criteria for the delamination of thermal barrier coatings:with application to thermal gradients
复合材料飞轮储能系统发展现状
The component assembling model and elasto-plastic-damage deformation of materials
Acceleration sensitivity analysis offrequency stability for micro-cavity oscillators
Prediction of muscle forces in human musculoskeletal systemapplication of classic mechanics methods in biomechanics
复合材料设计的原理与应用
A criterion for the avoidance of edge cracking in layered systems
基于滑移构元的多晶金属弹塑性本构模型
浅谈中国古建中斗拱的力学问题
A universal relationship between indentation hardness and flow stress
滑移构元模型和塑性屈服面的演化
加卸载响应比(LURR)与损伤变量(D)关系的研究
永乐大钟一悬挂结构动态响应分析
基于格构模型的混凝土动静态拉伸破坏试验数值模拟
边坡稳定性分析极限平衡法的简化条件
构元组集弹性损伤模型对准脆性材料损伤至断裂各向异性特征的分析
庆贺与回忆
庆贺与回忆
李先生引领我走上力学人生
李敏华先生的爱国情结
向李敏华先生学习
师恩难忘——恭贺李敏华先生九十大寿
跟随李敏华先生工作的日子

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A Constituinte retoma a discussão da futura Carta, do artigo 90 ao artigo 107, que trata do Poder Executivo e das funções do Presidente da República. Pela emenda aprovada o Presidente só poderá editar Medidas Provisórias e não mais decretos-lei. Decurso de prazo, a medida provisória tem de ser votada em 30 dias, do contrário,será rejeitada. O voto de discordância pode ser dado pela Câmara a um ministro, que por exemplo, faça retaliações políticas a Governadores. A moção de censura, se aprovada por 2/3, implica na exoneração do ministro. Os dois últimos dispositivos dividem os constituintes. Alguns constituintes se desvinculam de seus partidos e continuam como independentes na Constituinte.

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Em reunião no gabinete do Ministro Paulo Brossard, Governo e Constituinte conversam sobre Sistema de Governo. 4 partidos que juntos representam 85% dos votos da Constituinte. O Ministro da Justiça Paulo Brossard assegura que o Presidente Sarney acatará o que ficar definido na Constituinte. O Governo respeita a soberania da Constituinte. Em reunião entre o presidente da Constituinte e os líderes partidários fica definido a data para a votação do Sistema de Governo e o mandato de 5 anos para Presidente da República. Para os parlamentaristas a decisão será a mudança imediata ou para o próximo mandato. Entre os presidencialistas a tendência maior é manter o atual sistema realizando eleições para Presidente da República ainda este ano. A Constituinte está terminando o capítulo do Poder: Legislativo. Principais votações: Bancadas de até 70 membros; recesso de 90 dias: pagamento de imposto de renda integral para parlamentares: criação da figura do primeiro ministro. Na prática, todo o capítulo do Poder Legislativo até agora votado é parlamentarista.

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In 2004, comparative selectivity investigations were made with the now legal BACOMA codend of 110 mm mesh opening and alternative codends made of netting turned 90° of similar mesh openings on both commercial boats and on research vessels. The results show a certain variability of the BACOMA results – depending on ship type and season (L50 varying between 36,8 and 40,6) – and a general equal efficiency of codends made of netting turned 90° of the same mesh opening. Underwater observations and reduced performance of codends of equal circumference in meshes as the joining round at the end of the tapered part of the trawl indicate the need to reduce the relation of the cir-cumferences of codend and extension to 1 to 0.7 to achieve optimum fit and selectivity.