一种直线逼近渐开线齿廓曲线的自适应算法

从渐开线弧长公式出发，引入一种能根据加工精度要求来确定逼近线段的段数，并使节点在渐开线齿廓曲线上分布均匀的自适应计算方法。给出计算实例及用AutoCAD来绘制齿轮的方法．以及用VLisp语言编制计算程序和绘图程序的框图。     

考虑调整成本的Jorgenson投资模型

本文将资本存量的调整成本引入到Jorgenson投资模型，以说明资本存量是如何调整达到最优资本存量的问题。     

一类证券投资组合问题的风险与收益分析

本文利用概率统计的原理对一类证券投资组合所能减轻的风险作了讨论,并得到了风险最小的投资组合。     

建立我国海外投资保险制度的几点思考

从我国海外投资发展的现状、国际上可资借鉴的两种海外投资保险立法模式以及建立我国海外投资保险制度的具体立法设想几方面论述建立我国海外投资保险的相关问题.     

The innovation research of financial early-warning index measurement

The period economic fluctuation is vital for an enterprise to exist and further develop,it directly affect the enterprise financial health.So,it is significant to build up financial early-warning index and measure the warning condition that the enterprise faces and take the effective measures to eliminate. We criticize Altman's Z calculating model and build up some new indexes for enterprise financial early-warning condition measuring and making sound decision.     

中国上市公司资本结构影响因素之实证研究

资本结构不仅是财务理论研究中的热点及难点,也日益成为公司理财决策的关键问题.本文从影响因素角度对资本结构进行实证研究.文中以深沪两市部分非金融类上市公司为样本,利用本世纪最初三年的企业财务数据,选取可能影响企业资本结构的多个指标为解释变量,利用单因素方差分析、主成分分析、逐步回归分析找出了主要影响因素及其影响方式,试图为国内上市公司资本结构决定因素提供最新实证研究证据,并为企业财务决策提供支持.     

二元合金微观偏析的相场法数值模拟

使用耦合溶质场的相场模拟研究了Ni-Cu二元合金枝晶生长过程中固相溶质扩散系数D_s 对枝晶形貌和微观偏析等的影响.计算结果表明，随着D_s的减少，固液界 面前沿溶质扩散层越薄，枝晶生长越有利，枝晶尖端生长的速度越大，侧向分支越发达；D< sub>s越小，固相中溶质成分的波动越强烈，随着D_s的增大，固相中溶质 成分的波动相应减小；溶质微观偏析程度随D_s的增大而减小. 关键词： 相场方法 微观偏析 固相扩散系数 数值模拟     

On the growth strain origin and stress evolution prediction during oxidation of metals

High temperature oxidation of metals leads to residual stresses in the metal and in the oxide. In this work, we try to predict the evolution of the residual stresses in the growing oxides layers, during isothermal oxidation. The origin of these stresses is based on the microstructural model of Clarke, however, another justification is proposed, assuming a proportional dependence of the growth strain with the oxide layer thickness. Using the mechanics of thin layers, as well as the analysis proposed to describe the growth strain, a system of equations are deduced that predict the stresses evolution with oxidation time. Numerical analysis is performed, leading to a set of theoretical curves.     

Discrete-time GI/Geo/1 queue with multiple working vacations

Consider the discrete time GI/Geo/1 queue with working vacations under EAS and LAS schemes. The server takes the original work at the lower rate rather than completely stopping during the vacation period. Using the matrix-geometric solution method, we obtain the steady-state distribution of the number of customers in the system and present the stochastic decomposition property of the queue length. Furthermore, we find and verify the closed property of conditional probability for negative binomial distributions. Using such property, we obtain the specific expression for the steady-state distribution of the waiting time and explain its two conditional stochastic decomposition structures. Finally, two special models are presented.      

对现代财务报表的探讨

现代财务报表主要包括资产负债表和损益表。它们在日常经济工作中发挥着越来越重要的作用，但是它们不可能将企业的全部经济情况都反映出来。了解和关注现代财务报表所反映的问题，有利于我们对企业的发展状况做出正确评价，避免决策失误和利益损失，并对财务报表给予足够重视，使之能够更确切地全面反映企业的真实情况。