984 resultados para 118-734A
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Eterio Pajares, Raquel Merino y José Miguel Santamaría (eds.)
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本书阐明了板壳断裂理论的基础。论证了Reissner型板壳断裂理论的科学性、经典板壳断裂理论的缺陷及在一定范围内仍具有的实用价值;介绍了作者所创意的研究Reissner型板壳断裂纹尖端场的方法等。
目录
- §1.1 板壳弯曲断裂问题
- §1.2 Kirchhoff经典板壳弯曲断裂理论
- §1.3 Reissner型板壳弯曲断裂理论
- §1.4 Kirchhoff与Reissner型板壳弯曲断裂理论的比较
- §1.5 含裂纹有限尺寸板壳断裂分析的局部-整体法
- §1.6 含表面裂纹板壳
- §2.1 Kirchhoff板的基本概念和基本假定
- §2.2 基本公式与弹性曲面微分方程
- §2.3 边界条件
- §2.4 弹性薄板的应变能
- §2.5 极坐标下的挠曲面微分方程与内力公式
- §2.6 裂纹尖端场特征展开式通项公式
- §2.7 Kirchhoff板弯曲应力强度因子
- §3.1 基本方程和公式的复变函数表示
- §3.2 所引入函数的确定程度与一般形式
- §3.3 坐标变换与边界条件
- §3.4 运用保角变换方法求解孔口问题
- §3.5 应力强度因子与函数Φ(z)的关系
- §3.6 复变-主部分析法之应用简例
- §3.7 共直线裂纹问题的一般解答
- §3.8 典型弯曲裂纹问题的解答及弯曲应力强度因子公式
- §3.9 共圆曲线裂纹问题的解答及弯曲应力强度因子公式
- §4.1 裂纹尖端奇异元的位移模式与弯曲应力强度因子
- §4.2 裂纹尖端奇异元的刚度矩阵
- §4.3 裂纹尖端奇异元与常规单元的连接
- §4.4 解析法与数值法的结果比较与讨论
- §4.5 两共线半无限裂纹问题的定解条件及解的实用价值
- §5.1 Reissner型板的基本假定
- §5.2 Reissner型板的基本公式与平衡微分方程
- §5.3 基本方程的简化
- §5.4 边界条件
- §5.5 极坐标下的基本公式与平衡微分方程
- §5.6 两种平板理论用于无裂纹板时的比较
- §5.7 两种乎板理论用于含裂纹板时的比较
- §6.1 基本方程和一般求解方法
- §9.1 局部-整体法与其它解析和数值法的结果比较
- §9.2 边界对应力强度因子的影响
- §9.3 板的支承条件及长宽比的影响
- §9.5 计算Reissner型板应力强度因子的一组近似方程与近似解法
- §9.4 Reissner型板理论与Kirchhoff板理论所得应力强度因子的比较
- §9.6 关于数值计算的几点讨论
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目录
- 1.1 化合物的生成焓,反应焓及燃烧热
- 1.2 热化学定律
- 1.3 热力学平衡与自由能,化学平衡与反应自由能
- 1.4 质量作用定律及可逆反应的平衡常数
- 1.5 平衡常数和标准反应自由能的关系
- 1.6 温度和压力对平衡常数的影响
- 1.7 绝热火焰温度计算
- 1.8 化学动力学中采用的几个基本概念和定义
- 1.9 反应的分类
- 1.10 阿累尼乌斯(Arrhenius)定律
- 1.11 双分子反应碰撞理论
- 1.12 反应分子数及反应级数
- 1.13 影响化学反应的因素
- 1.14 链锁反应
- 5.1 燃烧波的两种形式――缓燃(或火焰正常传播)及爆震
- 5.3 马兰特和利-恰及利耶的简化分析法
- 5.4 层流火焰传播速度的无量纲分析法
- 5.5 泽尔多维奇和弗朗克-卡门涅茨基的分区近似解
- 5.6 分区近似解的改进
- 5.7 精确解
- 5.8 物理化学参数对S1的影响及对火焰厚度的影响
- 5.9 火焰传播界限
- 5.10 用层流火焰传播速度计算化学动力参数的方法
- 5.11 火焰的基本性质及火焰的几何学
- 5.12 本生灯火焰稳定的条件
- 5.13 层流火焰传播速度的实验测定
- 5.14 单组元燃料滴燃烧
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Azken bolada honetan osasun gastuaren hazkundea dela eta Estatuko Herri Administrazioan zein Autonomi Erkidego guztietan egonezin izugarria piztu da. Izan ere, gai honek zer ikusi handia du Ongizate Estatu ereduarekin. Ongizateren Estatuaren funtsezko neurritako bat osasun gastuak kontrolatzeko sistema on bat izatea da. Baina, horretarako ezinbestekoa da aurrekontuak egitura garbia eta arautzailea izatea. Beraz, aztertuko dute EAE-k zer nolako kontrol sistema juridikoa erabiltzen du.
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When, in the early 1990s, the European Commission began to promote part-time working as an important strategy for job creation and enhancing labour market flexibility, this mode of working already accounted for a large and growing share of total employment in the EU.
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This guide was developed to assist with the identification of western North Atlantic grouper species of the genera Alphestes, Cephalopholis, Dermatolepis, Epinephelus, Gonioplectrus, Mycteroperca, and Paranthias. The primary purpose for assembling the guide is for use with projects that deploy underwater video camera systems. The most vital source of information used to develop the guide was an archive of underwater video footage recorded during fishery projects. These video tapes contain 348 hours of survey activity and are maintained at the National Marine Fisheries Service (NMFS), Pascagoula, Mississippi. This footage spans several years (1980-92) and was recorded under a wide variety of conditions depicting diverse habitats from areas of the western North Atlantic Ocean, Caribbean Sea, and Gulf of Mexico. Published references were used as sources of information for those species not recorded on video footage during NMFS projects. These references were also used to augment information collected from video footage to provide broader and more complete descriptions. The pictorial guide presents information for all 25 grouper species reported to occur in the western North Atlantic. Species accounts provide descriptive text and illustrations depicting documented phases for the various groupers. In addition, species separation sheets based on important identification features were constructed to further assist with species identification. A meristic table provides information for specimens captured in conjunction with videoassisted fishery surveys. A computerized version enables guide users to amend, revise, update, or customize the guide as new observations and information become available. (PDF file contains 52 pages.)
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In the past few years, large-scale, high-seas driftnet fishing has sparked intense debate and political conflict in many oceanic regions. In the Pacific Ocean the driftnet controversy first emerged in the North Pacific transition zone and subarctic frontal zone, where driftnet vessels from Japan, the Republic of Korea, and Taiwan pursue their target species of neon flying squid. Other North Pacific driftnet fleets from Japan and Taiwan target stocks of tunas and billfishes. Both types of driftnet fishing incidentally kill valued non-target species of marine life, including fish, mammals, birds, and turtles. In response to public concerns about driftnet fishing, government scientists began early on to assemble available information and consider what new data were required to assess impacts on North Pacific marine resources and the broader pelagic ecosystem. Accordingly, a workshop was convened at the NMFS Honolulu Laboratory in May 1988 to review current information on the biology, oceanography, and fisheries of the North Pacific transition zone and subarctic frontal zone. The workshop participants, from the United States and Canada, also developed a strategic plan to guide NMFS in developing a program of driftnet fishery research and impact assessment. This volume contains a selection of scientific review papers presented at the 1988 Honolulu workshop. The papers represent part of the small kernel of information available then, prior to the expansion of cooperative international scientific programs. Subsequent driftnet fishery monitoring and research by the United States, Canada, Japan, Korea, and Taiwan have added much new data. Nevertheless, this collection of papers provides a historical perspective and contains useful information not readily available elsewhere. (PDF file contains 118 pages.)
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Sediment sampling was used to evaluate chinook salmon (Oncorhynchus tshawytscha) and steelhead (O. mykiss) spawning habitat quality in the South Fork Trinity River (SFTR) basin. Sediment samples were collected using a McNeil-type sampler and wet sieved through a series of Tyler screens (25.00 mm, 12.50 mm, 6.30 mm, 3.35 mm, 1.00 mm, and 0.85 mm). Fines (particles < 0.85 mm) were determined after a l0-minute settling period in Imhoff cones. Thirteen stations were sampled in the SFTR basin: five stations were located in mainstem SFTR between rk 2.1 and 118.5, 2 stations each were located in EF of the SFTR, Grouse Creek, and Madden Creek, and one station each was located in Eltapom and Hayfork Creeks. Sample means for fines(particles < 0.85 mm) fer SFTR stations ranged between 14.4 and 19.4%; tributary station sample mean fines ranged between 3.4 and 19.4%. Decreased egg survival would be expected at 4 of 5 mainstem SFTR stations and at one station in EF of SFTR and Grouse Creek where fines content exceed 15%. Small gravel/sand content measured at all stations were high, and exceed levels associated with reduced sac fry emergence rates. Reduction of egg survival or sac fry emergence due to sedimentation in spawning gravels could lead to reduced juvenile production from the South Fork Trinity River. (PDF contains 18 pages.)
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Germany is one of the iodine deficiency countries in Europe. Marine fish and its products can considerably contribute to the iodine supply via food. The short review gives an overview on the iodine content in fish and other marine species and discusses the influence of house hold cooking and other kitchen preparations. The iodine content in marine fish depends on the species and varies considerably at high level. Lean fish species have an average iodine content of more than 100 μg I / 100 g edible part. The recommended allowance for adults of dietary iodine of 180-200 μg can be covered by the consumption of one marine fish portion per day.
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Fish which has been cured or are in the process of being cured by traditional methods are usually infested by insects, posing a real problem to traders and processors, especially in Nigeria. The effects of 0.03% actellic 50 EC solution and vegetable oil on insect infestion were studied using West African sardines, Sardinella maderensis. Actellic solution was more effective in combating insect infestation than vegetable oil. Appearance and perceived smoked fish flavour of fish treated with Actellic and vegetable oil differed (P<0.05), while taste was unaffected by treatment. Actellic 50 EC solution though effective, could be subject to abuse
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Limnological studies in Lake Victoria (Kenyan portion) have been sporadic. Water quality and nutrient dynamics studies are being undertaken in fifteen sampling sites that have been divided into four ecological zones namely: Nyanza Gulf, Rusinga Channel, open waters inshore and open waters. The ongoing study will show how the physical and chemical paramenters affect fish distribution and abundance.
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由于社会与经济可持续发展的重要需求,近年来环境力学研究得到迅速发展,成为力学学科一个新的重要生长点.
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Minced fish is a significant component of a number of frozen fishery products like fish fingers, cakes and patties. Predominately minced fish is produced from gadoid species (Alaska pollack, cod, saithe, hake and others) possessing the enzyme trimethylamine oxide demethylase (TMAOase, E.C. 4.1.2.32) (Rehbein and Schreiber 1984). TMAOase catalyses the degradation of trimethylamine oxide (TMAO) to formaldehyde (FA) and dimethylamine (DMA), preferentially during frozen storage of products (Hultin 1992). In most gadoid species light muscle contains only low activity of TMAOase, the activity of red muscle and bellyflaps being somewhat higher. In contrast, the TMAOase activity in blood, kidney and other tissues, residues of which may contaminate minced fish flesh, may be higher for several orders of magnitude (Rehbein and Schreiber 1984).
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Commercially processed and for industrial purpose destined minces of several fish species were characterised with regard to their texture using texture profile analysis (TPA) of boiled specimen and by measuring the penetration force on raw minces as well as with regard to their colour by instrumental measurements of CIELab values. Concerning the parameters investigated the minces were in most cases significantly different. It was evident that the fish species is responsible for the functional properties of these intermediate products. For the TPA the influence of the measurement conditions was demonstrated and an appropriate method derived. IEF of proteins was used to verify the declared fish species. Unfortunately, this was not possible in all cases due to the lack of comparable pattern. Both the DMA and FA content were found to be in the normal range except those for saithe.