2008年南方冰灾输电塔损毁原因调查与分析

以2008年受冰灾较为严重的湖南省郴州市为例,基于实地调查所取得的大量资料,剖析了2008年1月以来由于冰覆引起的大量输电塔倒塌的主要原因.研究表明：严重覆冰所引起的输电塔超载、输电塔布局不合理所引起的不平衡力等是造成冰雪灾害中大量输电塔倒塌的主因;同时提出了输电塔设计改进的建议,为最大限度减少类似灾害造成输电塔损失提供参考.     

阿托品选择电极的研制和应用

报道了一种阿托品选择性电极的研制和应用，该电极是将对阿托品敏感的聚氯乙烯膜涂敷于ｐＨ玻璃电极球部表面而制成。在０．１０ｍｏｌ／Ｌ，磷酸盐冲浓度（ｐＨ４．０）中，所制电极对阿托品的Ｎｅｒｎｓｔ响应线性范围为１．７０×１０＾－５～２．００×１０＾－２ｍｏｌ／Ｌ阿托品，响应斜率为５５．８ｍＶ，电极响应时间小于４５ｓ，使用寿命大于６个月，而且具有制作简单，使用方便的特点，已将该电极应用于硫酸阿托品制剂中测     

利用矩阵的初等行变换对矩阵的特征值与特征向量同步求解

利用矩阵的初等行变换对矩阵的特征值与特征向量同步求解刘国琪，王保智（河北电力职工大学０７１０５１）一般教科书中介绍的求矩阵Ａ的特征值与特征向量的方法是：首先，求问ＩＡＥ—Ａｌ＝０，得特征值Ａ。；然后，对每一个人，间方程组（Ｇ怎一Ａ）Ｘ—。，得特征向量...     

具有低阶项的散度型椭圆方程的解在Morrey空间上的局部正则性

本文研究了具有低阶项的散度型椭圆方程-(a_(ij)u_(x_i))_(x_j)+b_iu_(x_i)-(d_ju)_(x_j)+cu= (f_j)_(x_j),a．e．x∈Ω的解在Morrey空间上的局部正则性,其中a_(ij)∈VMO∩L~∞(Ω),低阶项系数属于适当的Morrey空间．     

高维空间中的有界凸域

证明n维空间中的有界凸域D能被拟共形映射到n维单位球B~n(0,1),即D是拟球,从而说明拟共形映射中的黎曼定理在n维空间中的有界凸域类中是成立的．     

Asymptotics on Two-dimensional Recursion Sequences

In this paper, we give precise formulas for the general two-dimensional recursion sequences by generating function method, and make use of the multivariate generating functions asymptotic estimation technique to compute their asymptotic values.     

Flow Structures Around Micro-bubbles During Subcooled Nucleate Boiling

The flow structures were investigated around micro bubbles on extremely thin wires during subcooled nucleate boiling.Jet flows emanating from the bubbles were observed visually with the fluid field measurement using high-speed photography and a PIV system.The jet flows induced a strong pumping effect around a bubble.The multi-jet structure was further observed experimentally, indicating the evolution of flow structure around micro bubbles.Numerical simulations explore that the jet flows were induced by a strong Marangoni effect due to high temperature gradients near the wire.The bubble interface with multi-jet structure has abnormal temperature distribution such that the coolest parts were observed at two sides of a bubble extending into the subcooled bulk liquid rather than at the top.Evaporation and condensation on the bubble interface play important roles not only in controlling the intensity of the jet flow,but also in bringing out the multi-jet structure.     

Multi-Phase Flow and Heat Transfer of a Micro-Pump Thermally Driven by a Multi-Output Pulse Laser

We present an experimental study of multi-phase flow and heat transfer in a micro-tube induced by a multi-output pulse laser. Extensive flow and heat transfer measurements and visualization experiments have been carried out to characterize the micro-pump behaviour under various conditions. The experiments reveal extremely unsteady and complex flow patterns in the micro tube with the flow closely related with generation and collapse of bubbles.It is found that the flow rates are controlled by the heating and condensation conditions within the tube. The laser pulse duration, pulse interval and output-power as well as the tube diameter all show a strong influence on the flow rate of the micro-pump. This study provides a basis for the design of thermally-driven micro-pump induced by a pulsed laser beam.     

非线性Schroedinger方程组的精确解组

运用Maple语言程序，在没有假设的条件下，得到了具有耦合特性的非线性Schrfidinger方程组的行波精确解组及其约束条件方程，它们的表达式涵盖了所有的耦合解组与非耦合解组，具有任意性。耦合解组的算例函数及其特性分析，解释了α螺旋蛋白质螺旋链运动模型的行波孤立子解的耦合效应，揭示了增加、稳定和控制蛋白质活性和功能的方向。文章的研究方法，为求解耦合的非线性微分方程组的行波精确解组探索了蹊径。     

ARCH(0,1)系数中位无偏估计分布的渐近展开(英文)

This paper is concerned with the distributional properties of a median unbiased estimator of ARCH(0,1)coefficient.The exact distribution of the estimator can be easily derived,however its practical calculations are too heavy to implement, even though the middle range of sample sizes.Since the estimator is shown to have asymptotic normality,asymptotic expansions for the distribution and the percentiles of the estimator are derived as the refinements.Accuracies of expansion formulas are evaluated numerically,and the results of which show that we can effectively use the expansion as a fine approximation of the distribution with rapid calculations.Derived expansion are applied to testing hypothesis of stationarity,and an implementation for a real data set is illustrated.