图象处理技术在散光光弹性实验力学中的应用

本文介绍了对散光光弹性图片经过平滑、双值化、中值滤波和抽取条纹中心线算法等步骤后抽取其骨架,从而采集应力计算所必须的数据。该算法具有相当的通用性和可靠性,对其它具有严重纹斑噪音和低对比度图片的处理,都取得了满意的结果。     

奥氏体不锈钢1Cr18Ni9Ti车削条件优化的试验研究

车削奥氏体不锈钢所用刀具最佳硬质合金牌号为798;刀具最佳几何参数为:γ_0=10～20°,α_(?)=8～12°、λ_s=-5～-12°和bγ_1=(0.10～0.14)mm,γ_(01)=-10～-12°、b_e=0.10mm;通过一次回归正交试验获得计算最优切削速度的经验公式:υ=357.9f~(-0.51)f~(-0.38)αp~(-0.24)。     

用微机改进气轨实验

本文提出用微机改进气轨实验的方法，该方法可以减少实验误差及降低实验成本。     

提高中学化学实验课教学质量的尝试

通过改进中学化学教学法实验课的内容，设计及教法，初步探讨了提高中学化学教学法实验课教学质量的方法。     

Costs and benefits of mycorrhizas: Implications for functioning under natural conditions

Summary It is paradoxical that most plants under natural conditions are infected with vesicular-arbuscular mycorrhizal fungi, yet that it is often difficult to demonstrate that infected plants receive any benefit from the association. The costs and benefits of infection are analysed and a hypothesis formulated that infection only yields benefits at times during the life cycle when P demand by the plant exceeds the capacity of the root system. A simulation model is described that suggests that infection density should be more or less constant below a threshold value of root P uptake rate, but that above this value roots should be non-mycorrhizal. More extensive study of mycorrhizas under field conditions is needed to test such predictions.     

绝热柴油机缸内对流传热的实验关系式

Based on experimental results, a new convection heat transfer correlation for adiabatic diesel engines is established in the form of analogue equation. Some characteristic parameters in the correlation are defined with special consideration to make it more suitable for adiabatic diesel engines.     

介入治疗法的实验模拟原理

主要阐述了介入治疗法的实验模拟原理和设计，为进行有关的实验研究提供了一种有效和可靠的方法．     

开边界条件下Fateev-Zamolodchikov模型的潜藏定域规范不变性

本文在量子反散射方法框架内详细研究了开边界条件下Fateev-Zamolodchikov 模型的潜藏定域规范不变性.结果表明,尽管Hamiltonian 量及其本征矢明显规范相关,但其能量本征值与Bethe方程却是规范不变的.     

A Study on Social Choice Making:the Number of Admissible Preference Orderings for SMV

In this paper,we study,mathematically speaking,the problem-the number of admis-sible preference orderings for the transitivity of simple majority vote(SMV)derived from Arrow'sImpossibility Theorem.In our research,we find,by computer enumerating,that some results givenby Craven are not correct.By defining a set of constraints,we give the recurrence formula of thelocal maximal number of admissible preference orderings and some other useful results.