PⅢ分布曲线ψ值表的研究及软件开发

ＰⅢ分布曲线的离均系数值表是ＰⅢ曲线的根本，目前我国所采用的值表是在较落后计算条件下产生的，本文在利用连分级数及求和级数精确计算ＰⅢ分布积分的基础上，联合牛顿迭代法与弦截矩法，可以很快地在已知Ｃｓ和频率Ｐ（％）的情形下迭代求得离均系数值．并和英文原版数学手册的有关数值进行了对比，结果完全相符，在此基础上，给出了几个频率Ｐ（０．００１～１．０％），Ｃｓ从０．０～６．５（间隔０．１）的值表，原值表与现值表在频率很小时在小数后面的第二位有差异，本文给出的其对比结果．作者编制了汉化的软件．

p Dissipative operator

In this paper the authors prove that the generalized positive p selfadjoint (GPpS) operators in Banach space satisfy the generalized Schwarz inequality, solve the maximal dissipative extension representation of p dissipative operators in Banach space by using the inequality and introducing the generalized indefinite inner product (GIIP) space, and apply the result to a certain type of Schrodinger operator.

Impact of carrier stiffness and microtopology on two-dimensional kinetics of P-selectin and P-selectin glycoprotein ligand-1 (PSGL-1) interactions

Mechanics and surface microtopology of the molecular carrier influence cell adhesion, but the mechanisms underlying these effects are not well understood. We used a micropipette adhesion frequency assay to quantify how the carrier stiffness and microtopology affected two-dimensional kinetics of interacting adhesion molecules on two apposing surfaces. Interactions of P-selectin with P-selectin glycoprotein ligand-1 (PSGL-1) were used to demonstrate such effects by presenting the molecules on three carrier systems: human red blood cells (RBCs), human promyelocytic leukemia HL-60 cells, and polystyrene beads. Stiffening the carrier alone or in cooperation with roughing the surface lowered the two-dimensional affinity of interacting molecules by reducing the forward rate but not the reverse rate, whereas softening the carrier and roughing the surface had opposing effects in affecting two-dimensional kinetics. In contrast, the soluble antibody bound with similar three-dimensional affinity to surface-anchored P-selectin or PSGL-1 constructs regardless of carrier stiffness and microtopology. These results demonstrate that the carrier stiffness and microtopology of a receptor influences its rate of encountering and binding a surface ligand but does not subsequently affect the stability of binding. This provides new insights into understanding the rolling and tethering mechanism of leukocytes onto endothelium in both physiological and pathological processes.

红外光子牵引探测仪中P型锗元件最佳参数的研究

本文对红外(10.6μm)光子牵引探测仪中P型锗的吸收系数与电阻率的关系进行了讨论。导出了P型锗对10.6μm光的吸收系数的简便公式。进而根据理论分析,给出了光子牵引探测仪锗棒的电阻率、长度及截面等最佳参数的选取原则和结果。利用文章中的公式可以很方便地计算锗元件参数和响应率。本文对光子牵引探测仪的制作有一定的指导意义。

在强激光下Ge平行板的动态F-P干涉效应

实验表明,在连续CO_2激光辐照下,Ge平行板透射光强度随时间呈准周期性的变化。基于平行平面板的多光束干涉理论,并考虑激光引起的温升对Ge片折射率和厚度的影响,得到的计算结果与实验相符合。这说明平行平面Ge在高功率连续CO_2激光作用下因折射率和厚度随温度的变化而具有一种动态的法布里-珀罗干涉效应。

水平荷载作用下群桩P-Y曲线特性研究

<正>1概述海洋结构物常常使用桩基础以抵抗较大的水平荷载和位移．这些水平荷载主要由风暴、冰及波浪作用而产生,在这种水平荷载作用下桩身反应特性非常复杂且是非线性的,目前常用反映非线性桩-土-桩相互作用的P-Y曲线来分析水平荷载下单桩的反应特性,但对于需用多根相距较近的桩(群桩桩距通常为3-5倍桩径)共同抵抗水平荷载的情况不

P-选择素Lectin结构域稳定性的模拟预测

<正>选择素(selectin)与其配体间相互作用介导的细胞粘附在炎症级联反应、肿瘤转移和淋巴细胞归巢等病理、生理过程中起重要作用[1]。X-ray衍射发现P-选择素的最小功

P-选择素CR结构域功能的模拟预测

国家自然科学基金项目(10702075/30730032)

加载历史对低刚度下P-选择素-PSGL-1键寿命的影响

国家自然科学基金项目(30730032)