水平地震作用下无锚固储罐应力与应变响应分析

在考虑地基与储罐相互作用的情况下,采用有限元法对储罐在水平地震荷载作用下的应力及应变反应进行了数值计算。对3×104m3和2×103m3罐壁应力及应变的分析结果表明:环向、轴向应力及应变的分布形式呈现出明显的下部大上部小的特点,在偏底部的位置出现应力和应变的峰值;储液罐在水平地震作用下“象足”变形是由纵向压应力达到屈曲临界应力导致的屈曲破坏,不是强度破坏,即破坏属于失稳破坏而非强度破坏。     

水平地震激励下储罐液体晃动与提离分析

在考虑地基与储罐相互作用的情况下,采用有限元法对储罐在水平地震荷载作用下的液面晃动及储罐提离反应进行了分析。结果表明:罐内液体的晃动是长周期运动,其周期受地震动影响。无论是小体积罐还是大体积罐,在一定的地震烈度下均可以发生提离,而且储罐发生提离的时刻大多数是在地震动的峰值过后的一段时间内。大体积的储罐的提离明显小于小体积的罐。底板提离区域为月牙形。     

潜水含水层井损计算方法探讨

本文根据潜水含水层稳定流多落程抽水试验所取得的△hw2～f（Q）关系曲线，推导出了潜水含水层中井损计算公式或并结合实例阐述了潜水含水层中稳定流抽水试验井损的计算方法；对利用稳定流抽水试验准确求解水文地质参数具有一定参考意义。     

浙江上虞发现罕见第四纪石冰川群地貌及冰川遗迹

石冰川．是冰川退缩后或无冰川覆盖区域．因气候处于极度寒冷条件下．大量冰碛及冰川漂砾或风化岩屑、岩块．在冻融作用下．沿沟谷运移．并形成大规模线状分布的冻融岩块发育区。是古冰缘气候条件下形成的特有产物（地质矿产部《地质辞典》办公室．1983）；     

板弯曲弹塑性分析拟协调元

本文从拟协调元列式出发，建立板弯曲弹塑性分析单元，给出了分层和不分层的板弹塑性问题的Ｔｒｅｓｃａ屈服准则下，由切线刚度法进行求解的方法。     

陕西强连阴雨天气个例的综合分析

利用T213客观分析资料,对陕西2003年8月24日~9月7日强连阴雨天气过程的综合分析表明,连阴雨发生在欧亚稳定的环流形势下,乌拉尔山阻塞高压的建立和稳定使东亚中纬度纬向环流得以长时间维持。偏北、偏西、偏强的西太平洋副热带高压,不仅使冷空气受阻于秦岭山脉附近,同时其外围的偏南气流也为雨区提供了丰富的水汽,而乌拉尔山阻塞高压的崩溃引导冷空气大举南下,西太平洋副热带高压的东移南退则预示着持续的降水天气的结束。东亚合成环流的垂直结构表明,连阴雨期间秦岭邻近地区始终处于锋区中,并存在低空辐合、高空辐散的垂直结构。水汽条件分析表明连阴雨期间水汽的输送主要在对流层底部。热力学条件分析显示连阴雨期间河套始终为高潜热能区和位势不稳定区,偏南气流对热量的输送与高潜热能的维持有密切的关系,而低层偏东气流的加强促使了潜热能的释放,并导致了秦巴山区强降水天气的产生。     

工程物探方法在上海城市建设与管理中的应用

工程物探是各学科和地球物理学的交叉学科,是目前应用地球物理领域中的一个重要的分支,它以地球物理学的理论、方法和技术来研究和勘查各种地球物理场的变化,提取人类活动(工程)对地质体原有状态的影响,探测地下目的体,评价工程质量,为工程的选址、建设、施工质量及安全性做出评价。上海城市建设工程物探的应用和相应的方法技术及工作程序,可供非物探专业的工程技术人员参考和借鉴。     

CHZ-Ⅱ海洋重力仪重力敏感结构的性能测试与分析

在原有CHZ重力仪研制基础上,设计新一代海洋重力仪CHZ-Ⅱ并进行硬件搭建与测试。阐述了为CHZ-Ⅱ重力敏感结构设计的测试方案、实验过程及其结果分析,主要包括弹性系统的刚度、交叉耦合效应和漂移效应。实验表明,该结构在目前的测试内容下符合设计要求。     

Provenance of Lower Cretaceous Wölong Volcaniclastics in the Tibetan Tethyan Himalaya: Implications for the final breakup of Eastern Gondwana

Lower Cretaceous volcanic lithic arenites, widely distributed in the Tethyan Himalaya, provide insights into the continental breakup of Eastern Gondwana. In southern Tibet they are represented by the Wölong Volcaniclastics. The volcanic rocks that contributed clastic material to the lower parts of this unit were predominantly alkali basalts, whereas rhyolitic/dacitic volcanism becomes the predominant source of the upper strata. Geochemical analyses of basaltic grains and of detrital Cr-spinels from the Wölong Volcaniclastics demonstrate the alkaline character of the volcanism and suggest “within-plate” tectonic setting for the volcanism. Zircon U–Pb ages confirm that this volcanism continued from ～ 140 Ma to ～ 119 Ma. Hf-isotope data on these Early Cretaceous zircons indicate that their parental magmas were mantle-derived, but in the later stage of magmatic activity mantle-derived magmas were mixed with partial melts derived from the continental crust.The Lower Cretaceous volcaniclastics occur along a broad belt paralleling the northern margin of Greater India. The onset of volcaniclastic deposition in the Himalayas appears to become progressively younger toward the west, but it ended synchronously during the Late Albian (～ 102 Ma). The low volume of volcanic rocks and their intra-plate tectonic setting suggest that they are the result of decompressional melting along extensional deep-seated fractures cross-cutting the continental crust, and reflect changes in regional intra-plate tectonic stresses when Greater India began to separate from the Australia–Antarctica supercontinent.     

Influence of dietary n-3 LC-PUFA on growth,nutritional composition and immune function in marine fish Sebastiscus marmoratus

A 60-day feeding experiment was conducted to investigate the influence of dietary omega-3 long-chain polyunsaturated fatty acids(n-3 LC-PUFA) on growth, nutritional composition and immune function of marine fish Sebastiscus marmoratus. Five diets containing 3.6, 10.2, 18.2, 26.5, or 37.0 g/kg n-3 LC-PUFA were prepared. The results reveal significant influences of dietary n-3 LC-PUFA on the final weight, weight gain, specific growth rate, feed conversion ratio, and condition factor. As dietary n-3 LCPUFA increased, weight gain and specific growth rate increased and were significantly higher in groups fed 18.2, 26.5 and 37.0 g/kg than in groups fed 3.6 and 10.2 g/kg( P 0.05); there was no significant difference between groups fed 18.2, 26.5, or 37.0 g/kg( P 0.05). With increasing dietary n-3 LC-PUFA, eicosapentaenoic acid and docosahexenoic acid content in muscle and liver increased significantly, immunoglobulin class M content gradually increased from 9.1 to 14.8 μg/L, and lysozyme activity content increased from 1355 to 2268 U/mL. Broken line model analysis according to weight gain indicated that a dietary n-3 LC-PUFA level of 18.2 g/kg is essential for normal growth at a fat level of 125 g/kg. Therefore, appropriate dietary n-3 LC-PUFA not only promote growth and improve the n-3 LC-PUFA content, but also enhance immune function in S. marmoratus.