应用系统综合集成预测洪灾后急性血吸虫病流行趋势的研究

目的 :应用系统综合集成预测法探讨洪灾后急感的发病趋势 .方法 :由果及因建立急感构成比数学模型和灰色数列 GM( 1 ,1 )模型 ,分别对 1 998年洪灾后急感发病趋势进行预测 ,并由此进行灾变预测 .结果 :急感呈逐年下降趋势 ,洪灾年份急感发病最多 ,表明洪灾期间易导致急感的大量流行 ;应用综合集成预测洪灾后急感的发病趋势 ,方法简便 ,精度较高 ;文中模型具有广泛性 ,可用于其它方面的预测.     

亚纯函数导数的特征函数的性质与级（Ⅰ）

研究了亚纯函数ｆ（ｚ）为整函数时，其导数ｆ＇（ｚ）的特征函数的一个性质与级。     

对称Anderson晶格的反铁磁极化

考虑最近邻格点 f电子的电荷相关和自旋相关,用局域方法研究了对称 An-derson 晶格中由局域磁矩引起的极化。结果表明,极化总是反铁磁的;当同一格点相反自旋 f 电子间的库仑作用增大或 d-f 电子间杂化强度减小时,这种反铁磁极化变强。     

一类分形上严格计算Ising模型关联函数的方法

介绍了相变理论中的组合近似和图形展开技术，并用这一方法严格计算了Ｂｅｔｈｅ－ｔｙｐｅ格子上Ｉｓｉｎｇ模型的配分函数和自旋关联函数。     

多项式零点定位基本定理的简化证明

基于 Djaferis 与 Mitter,Wimmer 的模论方法,给出关于 Routh-Hurwitz 问题与 Schur-Cohn 问题的基本定理的简化证明.     

结构法在英语教学中的应用

对结构法在句型教学、听说教学和电化教学等方面的应用作了探讨,认为把结构法应用于英语教学中,对强化英语的基本功训练有着明显的效果。     

金属压力加工问题的流函数速度模式上限解

采用流函数法构造了塑性变形金属流动的完备速度模式，对Ｍｉｓｅｓ材料平面变形和轴对称变形问题，提出并推证了运动可能速度场应满足的力学边界条件一“边界切应力”约束方程。将求解与运动可能速度相对应的应力场归结为确定一点静水压力的问题，实现了由上限法确定问题的完全解。应用这一理论对锥模拔管问题进行了计算分析。     

双层对称薄膜中自旋波存在条件与各向异性

采用界面重标度(IR)方法，研究了非周期性边界条件下，双层铁磁薄膜中自旋波的本征值问题及对称薄膜中自旋波的存在条件；并计入体单轴各向异性，讨论了其对对称铁磁薄膜中自旋波色散关系及波形的影响，结果表明：在完全对称情况下，该系统除了可能存在一支光学——光学界面模外，只存在体模一种形式．而且，体单轴各向异性除了对本征模能量有影响外，对自旋波的色散曲线趋势及波形都没有影响．     

A FORMAL SYSTEMS APPROACH TO SOLVER DESIGN—HILL CLIMBING METHOD WITH PUSH DOWN STACK

This paper presents a formal approach to design of a solver of an intelligent managementinformation system and its implementation. The approach implies set theoretic modeling based on thegeneral systems concepts and implementation in the extProlog. There are research efforts which attack(optimization)problems using the set theory and logics.Furthermore, they use logic programming languages for their implementation. Although their methodslook quite similar to the approach of this paper, there are clear differences between them. This paper isinterested in exploration of the solving system rather than algorithms. The paper first presents a design and implementation procedure of a solver. Then, classificationof problems is discussed. The least structured class of the classification is the target of this paper. Adata mining system is an example of the class. Formal theories are derived for the design procedure assuming the least structured case. A solvingstrategy,which is called a hill climbing method with a     

Schreiber approach for GPS carrier phase ambiguity resolution

Differenced GPS carrier phase observations are usually used in GPS positioning to eliminate the various common GPS errors. A different approach is proposed in this paper where no differencing of the observations is required. In this method, the common GPS errors are modelled explicitly and eliminated by introducing the Schreiber method, which is used in traditional geodesy to eliminate the azimuth unknowns in observation equations. The paper first introduces the Schreiber method, and then discusses its application to the various GPS common-mode error models. It is shown that if only the real ambiguity solution is concerned, the estimate of the position parameters from the Schreiber approach is the same as that from the differencing approach. However, the variance of the ambiguity estimate from the Schreiber approach is smaller than that from the differencing approach. Numerical examples are given to show that the results are reliable.