顶管施工隧道扰动区土体变形计算

针对目前已有顶管施工扰动区土体变形预计公式存在的缺陷,提出了一种新的扰动区土体变形计算方法.将顶管施工隧道周边岩土体看作一种随机介质,将隧道开挖(或挤压)所引起的土体移动看作一随机过程,应用随机介质理论,对顶管施工隧道开挖引起的扰动区土体的移动与变形进行分析,推导了相应的扰动区土体下沉(隆起)、倾斜、水平移动、水平变形及弯曲曲率计算公式,并编制了相应的计算程序.研究结果表明:该方法预计结果精度高;顶管施工引起的扰动区土体的变形较大,超出地表建筑物及地下管线的允许变形,在实际施工中应采取有效的防护措施.     

pq阶环

证明了ｐｑ阶环是循环环，进而讨论了ｐｑ阶环的一个数及其构造。     

圈积的正规循环子群的结构(Ⅰ)

证明了当｜Ａ｜＞２或｜Ｂ｜＞２时，圈积ＡＷｒＢ＝Ｂ∝Ｋ的每一个正规循环子群都包含在基群Ｋ中。     

循环压缩－拉伸载荷下矩形板的极限强度

采用弹性大变形分析以及塑性分析相结合的方法讨论了循环压缩－拉伸载荷下长矩形板的非弹性载荷－变形性能。重点是探讨循环面内载荷下薄矩形板在后屈曲范围内的滞回特性。分析表明，板的面内压缩刚度和承载能力将随循环次数的增加而不断降低。     

三个特殊过程组成的理想气体的循环效率

理想气体的三个特殊过程组成的循环乃是最简单最基本的循环。此种循环只要在相应限定的Ｐ－Ｖ图中的图形相仿，可以证明，它在该图中所有相仿区域内的效率均相等。导出的效率公式可以方便地计算具体问题，并为热机工作区的选择提供有益的参考。     

Regulation of mouse trophoblast giant cell nucleus development in hatched mouse blastocysts by cyclic cytidine 3′,5′-monophosphate (cCMP)

Summary The dibutyryl analog of cCMP enlarged the nuclei of trophoblast gian cells and promoted blastocyst development. The result suggests that cCMP has a trophic effect on embryonic development, specifically by altering the size of the trophoblast cell nucleus but does not enhance trophoblast cell proliferation processes.     

Structure and function of a calmodulin-dependent smooth muscle myosin light chain kinase

Summary In smooth muscle the M_r 20,000 light chain of myosin is phosphorylated by a calmodulin-dependent protein kinase. It consists of 2 subunits: calmodulin, an acidic protein of M_r 17,000 that binds 4 moles of Ca²⁺; and a larger protein of M_r circa 130,000. Activation of the kinase is dependent upon their association in the presence of Ca²⁺. Cyclic AMP-dependent protein kinase phosphorylation of the myosin light chain kinase occurs at 2 sites. It decreases the affinity of the kinase for calmodulin and a reduction in the rate of light chain phosphorylation occurs. The kinase has an overall asymmetric shape composed of a globular head and tail region for the skeletal muscle enzyme. Trypsin digestion of this kinase releases a fragment of M_r 36,000 from the globular region that contains the catalytic and calmodulin binding sites. Chymotrypsin digestion of the kinase from smooth muscle generates a fragment of M_r 80,000 that does not contain the calmodulin binding or cyclic AMP-dependent protein kinase phosphorylation sites. It is a Ca²⁺-independent form of the kinase that phosphorylates the light chain of myosin. These structural features indicate a regulatory role for the kinase in smooth muscle phosphorylation and contraction.     

THE CYCLIC BANDWIDTH PROBLEM

ＴＨＥＣＹＣＬＩＣＢＡＮＤＷＩＤＴＨＰＲＯＢＬＥＭ￥ＬＩＮＹｉｘｕｎ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＺｈｅｎｇｚｈｏｕＵｎｉｖｅｒｓｉｔｙ，Ｚｈｅｚｈｏｕ４５００５２，Ｃｈｉｎａ）Ａｂｓｔｒａｃｔ：Ｔｈｅｃｙｃｌｉｃｂａｎｄｗｉｄｔ...     

一类l次循环域与Fermat方程

给出了一类l次循环域,其导子、判别式和在其中分歧的全部有理素数都由l次分圆多项式的值所确定.最后,指出了一个证明Fermat大定理的途径.     

存在不确定性干扰的生产计划──库存控制过程最优化

给出了在存在不确定性干扰的情况下，生产计划—库存控制过程最优化的动态提法．在此基础上提出了一个在线克服不确定性干扰寻求最优控制的实用算法．