软弱夹层土对软土场地地震效应的影响

本文以来自天津某工程的一场地为原型,对软夹层的埋深和厚度对软土场地地震效应的影响进行了数值分析.为了分析软弱夹层的埋深和厚度对地表地震动参数的影响,分别对原剖面进行了以下处理：软弱夹层的埋深从2 m增加到62 m,构造了16个剖面;软弱夹层的厚度从2 m增加到10 m,构造了5个剖面.选用Taft、ElCentro和Northridge地震记录作为输入地震动,利用程序SHAKE91对不同的构造剖面、不同的输入地震波及不同的峰值加速度水平,进行了场地地震反应分析,结果表明：对于给定的输入地震动和峰值加速度水平,随着软弱夹层埋深的增加,地表加速度峰值和放大系数λ都有减小的趋势,当埋深超过一定值后,地表加速度放大系数小于1.0;软弱夹层厚度对地表加速度峰值的影响与软弱夹层所处位置有关.     

Discovery of the budding phosphatized globular fossils from the Neoproterozoic Doushantuo Formation at Weng’an, Guizhou Province, China

There is much debate on biological affinities of the phosphatized globular fossils from the Neoproterozoic Doushantuo phosphorites at Weng’an, Guizhou Province. Here we report for the first time the budding structures of some of these globular fossils, which have previously been interpreted as the resting eggs and early cleavage embryos of metazoans. The budding structures are similar to the germinating tubes of the spore and zygote of living algae, suggesting that some globular fossils from the Doushantuo phosphorites bear affinity with algae. The present new information indicated various biological affinity of the phosphatized globular fossils from the Doushantuo phosphorites.     

CBA与NBA球队主客场赛防守技战术运用的比较研究

用观察和统计法,对CBA和NBA球队主客场赛防守技战术运用效果进行比较.结果发现:CBA球队客场全场紧逼战术和第1阶段主场防守效果好于NBA球队;第3阶段主场防守篮板球的效果与NBA球队存在差距,两者在防守技战术运用效果的稳定性上也存在差距.     

新型箱状组合压型钢板承载力研究

箱状组合压型钢板是压型板发展的一种新的结构形式，为进一步研究其性质，介绍了它的现场载荷实验情况，描述了建立有限元模型的过程，结合实验数据比较了3种模型，分析了两种因素对构件性质的影响，并通过实验数据对不同厚度的3种构件的性质做了对比。     

Abnormal overpressure distribution and natural gas accumulation in foreland basins,Western China

Shizitan in Jixian County, Shanxi Province, is a site of transitional period from Paleolithic to Neolithic. The dating and the sporopollen analysis show that the middle reaches of the Yellow River where the site is located had been maintaining a steppe environment during 35.1-9.4 kaBP, in which, 35.1-17 kaBP belonged to the last glacial. With cold and dry climate, this period featured a desert steppe environment. In the late of this period, the area had a cold and half-humid steppe environment. The 17.0-11.9 kaBP belonged to the early- and mid-period of the last deglaciation. Mild and half-arid steppe alternates with mild and half-arid steppe, with a small amount of deciduous broadleaf species. During the period of 11.9-10.5 kaBP, cold and dry glacial climate appeared once more, featuring a desert steppe environment. During 10.5-9.4 kaBP, it is mild and half-arid, and later transited toward warm and half-humid. The early phase of this period featured a steppe environment and the later transited into a steppe environment with fairly more deciduous broadleaf species. Microlith, a mark of a transitional period from Paleolithic to Neolithic, was distributed mainly in 17.0-11.9 kaBP. The relatively warm, half-arid and fluctuating steppe environment in the early and medium period of the last deglaciation made a contribution to the appearance and development of Microlithic culture.     

棕色田鼠静止代谢率的比较研究

以棕色田鼠的耗氧量为指标，探讨了雌（哺乳和非哺乳），雄棕色田鼠能量代谢的特征，结果表明，在热中性区（20－25．0℃），棕色田鼠静止代谢率为2．4601moO2/g/h，是期望值的175．70％，其中哺乳雄鼠为2．5843mlO2/g/h，是期望值的190．68％，非哺乳雌鼠为2．3477mlO2/g/h，是期望值的164．92％，雄鼠为2．3949mlO2/g/h，是期望值的165．37％，棕色田鼠在22．5℃时的平均热传导为0．1797mlO2/g/h/℃，棕色田鼠较高的RMR（繁殖期更高），稍高的热传导率，是对生存环境的适应性反应。     

一种新型超氧化物歧化酶的活性中心量子化学计算

借助Fe-SOD的晶体模型，运用Gaussian94程序包，采用HF下的LanL2DZ基组对一种新型的超氧化物歧化酶Ni-SOD的还原型Ni(Ⅱ）－SOD的活性中心进行了量子化学计算，由其分子轨道能量，电荷分布和前线轨道的贡献可以预见，Ni-SOD具有较高的结构稳定性和催化超氧离子的活性。     

钒模拟超氧化物歧化酶的活性中心计算

借助Fe-SOD的晶体结构模型，运用Gaussian 94程序包，采用HF下的LznL2DZ基组对钒辅基模拟超氧化物歧化酶的活性中心进行了量子化学计算，由其分子轨道能量，电荷分布和前线轨道的贡献可以理论预测，V－SOD具有较高的结构稳定性和催化超氧阴离子的活性。     

109国道日月峡滑坡调查

2002年1月14日凌晨2时，109国道日月峡风化危岩高边坡在寒冬季节突发特大滑坡地质灾害。109国道被巨大滑坡体掩埋而被迫中断。经对该地质灾害实时调查测绘，初步认定该特大滑坡地质灾害为公路扩建改造工程所诱发，属牵引式堆积层滑坡。     

小零件自动送料的方位概率及定向

论述自动加工和装配中小零件在振动送料器中的自然静止方位概率，给出零件由运动到静止时方位改变与几何形状相关的概率分布；讨论了送料器结构和零件形状对定位和定向的作用及影响。