三重积分换元公式的一个新证法

利用在线性空间上推广混合积的思想,建立微分线性空间、引入广义向量外积,给出三重积分换元公式的一个简单证法.     

关于N阶混合型线性微分方程特征根的分布

本文利用数学分析,代数的基本理论对线性混合型微分方程的特征根在复平面上的分布作了初步讨论,从而得出:对于n阶混合型线性方程其特征根在一定条件下必分布在某直线的一边,而对于时滞项只含有n次项的n阶线性混合型微分方程,其特征根在一定条件下必分布在以y轴为对称轴的带状区域中,并在此基础上给出了混合型线性微分方程的所有指数解是渐近稳定(或不稳定)的一个充分条件,最后给出了Lecorun方程解稳定的代数判据。     

射影空间上对合透视的代数表达式

本文给出了三维射影空间上对合透视的代数表达式。     

2200m^3高炉嘉恒法渣处理钢制喷嘴改造

涟钢2200m^3高炉采用的是唐山嘉恒的轮法造渣系统,高压水喷嘴由于结构存在不足,造成更换频繁、维护成本高等问题。通过选用合理的改造方案对喷嘴进行了改造,收到良好效果。     

AN FTIR SPECTROSCOPIC STUDY OF LOW TEMPERATURE PLASMA TREATED WOOL FABRIC

FTIR-ATR technique with second-order derivative measurement was used for assessing the amount of oxidation products of cystine present on the plasma-treated wool fabric surface. In this paper, three non-polymerising gases namely oxygen, nitrogen and 25% hydrogen/75% nitrogen gas mixture were used for the plasma treatment of wool fabric. The oxidation products of cystine studied included S-sulphonate, cysteic acid, cystine monoxide and cystine dioxide. The variations of the amount of these products as a function of treatment time were studied. Experimental results showed that the oxygen plasma could produce a large amount of oxidation products of cystine on the wool fabric surface followed by nitrogen plasma and gas mixture plasma.     

运动目标快速搜索辨识路径规划模型

运动目标快速搜索辨识问题属于路径规划,与背包问题以及推销员最佳路线问题相似,但又存在明显区别：前者问题目标是运动的,后者是静止的;当运动目标是待辨识可疑船只时,还要考虑护航船队的安全。基于此,提出“动静结合”,在利用Hamilton回路算法和Kruskal避圈法的基础上,设计截相遇迭代算法,并根据目标的威胁等级以及聚集程度建立最优搜索策略。     

Improvement of Linen Fabric Wickability by Low Temperature Plasma Treatment

Low temperature plasma treatments were applied to linen with oxygen and argon, various level of discharge power and exposure time. Tbe fabric weight loss increased with the exposure time. Their effects on surface chemical properties and morphology of flax fiber, and fabric wickability were investigated. X - ray photoelec-tron spectroscopy discovered that the surface oxygen content of the plasma treated sample was increased. Formation of voids and cracks on the fiber surface was revealed by the scanning electron microscopy. Fabric wickability first was increased and then decreased with the prolonged exposure.     

以武汉大学图书馆为例谈谈高校图书馆以学科为中心的外文图书采访模式

本文对高校图书馆外文图书采访工作面临的问题进行了探讨,并以武汉大学图书馆为例,提出了以学科为中心的外文图书采访模式,论述了这一模式形成的基础即学科馆员制度的沿革和这一模式的工作流程,并通过分析武汉大学图书馆2008-2010年6个学科的外文图书订购情况阐述了该模式的成效。最后,笔者对这种外文图书采访模式提出了思考。