路径测试设计用例的设计与分析

探讨了组合数学法和BRO策略法两种不同的设计测试用例的方法在路径测试中的应用。     

Clustering the rows and columns of a contingency table

A number of ways of investigating heterogeneity in a two-way contingency table are reviewed. In particular, we consider chi-square decompositions of the Pearson chi-square statistic with respect to the nodes of a hierarchical clustering of the rows and/or the columns of the table. A cut-off point which indicates significant clustering may be defined on the binary trees associated with the respective row and column cluster analyses. This approach provides a simple graphical procedure which is useful in interpreting a significant chi-square statistic of a contingency table.The author gratefully acknowledges the constructive comments of the referees and the editor.     

原子外层空轨道相对最稳定顺序及周期性规则

本文提出原子外层空轨道相对稳定性可作为电子填充的粗略判据;给出由中性原子轨道能数据直接导出原子外层轨道相对最稳定顺序的图表及周期性规则;用以简明、清晰、合理地推引解释元素基组态和解释元素周期律。提出在中心势场模型基础上推引全部元素基组态的方法。     

能耗率极值原理和重力理论交互作用下粗质颗粒的浓度垂线分布

本文同时运用能耗率极值原理和重力理论研究了固液两相流在粗质颗粒时固相浓度的垂线分布,通过探讨能耗率极值原理对“非单向性”作用问题,进一步揭示了两相流运动的机理。计算结果与实测数据有较好的吻合。其研究方法、原理、步骤也极易推广到其它各种粒径的固相。     

On some significance tests in cluster analysis

We investigate the properties of several significance tests for distinguishing between the hypothesisH of a homogeneous population and an alternativeA involving clustering or heterogeneity, with emphasis on the case of multidimensional observationsx ₁, ...,x _n ^p . Four types of test statistics are considered: the (s-th) largest gap between observations, their mean distance (or similarity), the minimum within-cluster sum of squares resulting from a k-means algorithm, and the resulting maximum F statistic. The asymptotic distributions underH are given forn and the asymptotic power of the tests is derived for neighboring alternatives.     

脉冲示踪法实验误差分析

本文从理论和实验两方面分析了脉冲示踪法中脉冲时间、示踪剂输入和记录仪记录时间差、示踪剂纯度与用量和实验温度对反应器内物料停留时间分布和流动模型参数测定误差的影响,以便在实验中采取相应措施减小或消除误差,获得准确的实验结果。     

利用Jourdain原理研究二阶非完整系统的守恒律

目的研究具有二阶非完整约束的力学系统守恒律．方法利用Ｊｏｕｒｄａｉｎ变分原理∑Ｎｉ＝１（Ｆｉ－ｍｉｒ¨ｉ）·δ１ｒ．ｉ＝０,引入Ｊｏｕｒｄａｉｎ生成元（Δ１ｑｓ）．＝εＦｓ（ｔ,ｑ,ｑ．）,（Δ１ｔ）．＝εｆ（ｔ,ｑ,ｑ．）和推广的Четаев定义∑ｎｓ＝１φβｑ¨ｓδ１ｑ．ｓ＝０,得到无限小变换下列的不变性条件．结果当无限小生成元ｆ,Ｆｓ满足一定条件时可得到系统的守恒律．结论推广了完整系统和一阶非完整系统的相应结果,二阶非完整系统也存在守恒律．     

车用电控汽油机实时爆震检测方案的研究

研究一种可以满足准确性,实时性要求的车用电控汽油机爆震检测方案,方法 测量缸盖的振动信号,确定爆震检测频率,运用概率和数理统计的方法。对缸盖振动信号进行分析,找出规律性,在非爆震,严重爆震,爆震时,爆震检测区间内信号峰值都服从对数正态分布。     

坐标动量几率相关分布的辛普森法研究

用辛普森法研究了不同体系的粒子在动量空间和坐标空间的几率分布的相关性及坐标和动量的分布宽度之积与宽度内所含几率的关系。     

变质量高阶非线性非完整系统的相对论性Kane方程

本文在同时考虑经典变质量和相对论变质量的情况下,由相对论性成有Ｄ’Ａｌｅｍｂｅｒｔ原理推导出变质量高阶非线性非完整系统的相对论性Ｋａｎｅ方程。