旋转体表面摩擦力矩探讨

本文绘出了非跑合情况下由一般曲线所产生的旋转体表面和与其相配合的毂孔表面作相对匀速转动时，相对运动表面摩擦力矩计算的一般公式。     

Bellman-Ford算法的改进研究

针对传统距离矢量路由(Bellman-Ford)算法,将多约束路由问题简化,并改进路由问题的限制条件,提出了改进的Bellman-Ford算法,应用于基于集中式控制路由协议网络模型。仿真结果表明,采用改进算法的网络路由计算时间随网络节点数有明显的改善,且网络阻塞率随路由请求数增加而下降。验证了改进算法比传统算法更加有效。     

On the block structure of proper block designs

In this paper we consider proper block designs and derive an upper bound for the number of blocks which can have a fixed number of symbols common with a given block of the design. To arrive at the desired bound, a generalization of an integer programming theorem due to Bush (1976) is first obtained. The integer programming theorem is then used to derive the main result of this paper. The bound given here is then compared with a similar bound obtained by Kageyama and Tsuji (1977).     

沿海地区集聚式城市化地域扩张模式及优化

结合我国长三角、珠三角和环渤海湾新型城市化模式的具体案例，分析集聚式城市发展的动力机制和地域扩张模式，认为产业集聚已成为推动沿海区域城市化进程的重要驱动力。论题针对沿海区域集聚式城市化模式存在的问题提出了具体的对策建议。     

通用型阶梯式可转位端铣刀试验与研究

本文利用阶梯切削法原理，研究径向错移量较大的单组阶梯式铣削方法，进行了阶梯式可转位端铣刀结构设计计算公式的推导，并做了大量的切削性能对比试验，试验结果与预测指标相符。     

Complete designs with blocks of maximal multiplicity

The set of distinct blocks of a block design is known as its support. We construct complete designs with parameters v(?7), k=3, λ=v ? 2 which contain a block of maximal multiplicity and with support size $\text{b}{}^1\text{= (}{}^{\mathrm{v}}{}_3\text{) ? 4(v ? 2)}$. Any complete design which contains such a block, and has parameters v, k, λ as above, must be supported on at most (^v₃) ? 4(v ? 2) blocks. Attention is given to complete designs because of their direct relationship to simple random sampling.     

Approximation of power in multivariate analysis

We consider the calculation of power functions in classical multivariate analysis. In this context, power can be expressed in terms of tail probabilities of certain noncentral distributions. The necessary noncentral distribution theory was developed between the 1940s and 1970s by a number of authors. However, tractable methods for calculating the relevant probabilities have been lacking. In this paper we present simple yet extremely accurate saddlepoint approximations to power functions associated with the following classical test statistics: the likelihood ratio statistic for testing the general linear hypothesis in MANOVA; the likelihood ratio statistic for testing block independence; and Bartlett's modified likelihood ratio statistic for testing equality of covariance matrices.     

硅氧化物反应离子刻蚀均匀性研究(英文)

提出了提高径向刻蚀均匀性的一种新颖的方法。在反应离子刻蚀系统中,采用等离子体控制环调节硅氧化物的径向刻蚀速率,刻蚀均匀性在等效于直径为15 cm 硅片上可以达到±3%.     

基于SolidWorks及ANSYS对集成块优化设计

为解决复杂液压阀块在传统设计制造过程中工作量大、易出错、效率低等困难,采用SolidWorks三维软件对其进 行设计和前处理,可提高工作效率,减轻工作强度。再结合ANSYS分析软件,对集成块进行强度应力分析,以保证制品 的可靠性。最终使阀决达到集成化程度高、性能优越的特点,达到优化设计的目的。     

Optimal block designs for double cross experiments

ABSTRACT

This paper presents systematic methods of construction of optimal block designs for a double cross experiments for both even and odd values of “p” parental lines. The both even and odd values of designs are derived by using initial block of unreduced balanced incomplete block designs and initial block of row–column designs given by Bose et al. (1953 Bose, R.C., Shrikhande, S.S., Bhattacharya, K.N. (1953). On the construction of group divisible incomplete block design. Ann. Math. Stat. 24:167–195.[Crossref] , [Google Scholar]) and Gupta and Choi (1998 Gupta, S., Choi, K.C. (1998). Optimal row-column designs for complete diallel crosses. Commun. Stat. Theory Methods 27(11):2827–2835.[Taylor & Francis Online], [Web of Science ®] , [Google Scholar]), respectively. In this attempt we have found some new universally optimal block designs for double cross experiments.