Diagnostics for generalized Poisson regression models with errors in variables

In this paper, we develop diagnostic methods for generalized Poisson regression (GPR) models with errors in variables based on the corrected likelihood. The one-step approximations of the estimates in the case-deletion model are given and case-deletion and local influence measures are presented. Meanwhile, based on a corrected score function, the testing statistics for the significance of dispersion parameters in GPR models with measurement errors are investigated. Finally, illustration of our methodology is given through numerical examples.     

Empirical study of some non-parametric tests for dispersion of correlated data

Results of a computer simulation study of power and robustness of three competitor tests for comparing scales, for use with correlated data: Rothstein, Richardson and Bell (RRB), Arvesen, and Pitman, are presented. It is found that unless one could ímprove the approximate null distributions for Arvesen's and Pitman's test, RRB's procedure is best, having simulated probabilities of Type I error closest to the test's nominal α and being reasonably robust and powerful, for all distributions considered.     

矩形栅慢波系统的理论与实验研究

为了克服单模近似法在分析矩形栅慢波系统高频特性时的局限性,采用了一种新的方法,即在表示槽区内的场时,保留其高次项,表为一无限本征驻波之和的形式,利用场匹配法得到其色散特性,进而求得耦合阻抗。然后针对矩形栅慢波系统进行了数值计算,并分析了金属栅的几何尺寸对系统高频特性的影响,以作为器件设计的参考。设计出3cm、8mm波段的矩形栅高频结构模型,进行实验测量,得到的实验值与理论值符合良好。     

On the role of statistics in the palaeomagnetic proof of continental drift

Magnetized rocks provide a “tape recording” of the more recent history of the earth. It was this evidence that broke the opposition to continental drift. The nature of the data - samples of unit vectors in three dimensions - demanded new forms of statistical treatment. I hope that my personal account will enable the general statistician to see a rare example of statistics being developed to be a modest help in a major scientific revolution.     

Facility Dispersion Problems Under Capacity and Cost Constraints

The MAX-MIN dispersion problem, which arises in the placement of undesirable facilities, involves selecting a specified number of sites among a set of potential sites so as to maximize the minimum distance between any pair of selected sites. We consider different versions of this dispersion problem where each potential site has an associated storage capacity and a storage cost. A typical problem in this context is to choose a subset of potential sites so that the total capacity of the chosen sites is at least a given value, the total storage cost is within the specified budget and the minimum distance between any pair of chosen sites is maximized. Since these constrained optimization problems are NP-hard in general, we consider whether there are efficient approximation algorithms for them with good performance guarantees. Our results include approximation algorithms for some versions, approximation schemes for some geometric versions and polynomial algorithms for special cases. We also present results that bring out the intrinsic difficulty of obtaining near-optimal solutions to some versions.     

实用翼片加载螺旋线模型的分析及优化

螺旋线行波管是唯一能够在倍频程以上范围内高功率输出的器件。在本世纪７０年代中发展起来的金属翼片加载技术可以改善螺旋线系统特性，降低相速变化，提高带宽范围，金属翼片加载技术是螺旋线促波系统重点研究的一个方面，文中对此螺旋线翼片加载模型作了一些分析，得到了色散方程、衰减常数和耦合阻抗等公式，并作了数值分析，计算结果与实验结果具有很好的一致性。     

新型同轴慢波结构特性的研究

为了克服因增加返波管功率容量而引起的模式竞争问题,提出了波纹内导体同轴慢波结构,导出了该结构在冷腔时的TM0n模式色散方程,并数值计算和分析了该结构的色散特性。分析结果表明:采用该结构的返波管能够很好地改善模式竞争。     

部分填充手征媒质的圆波导的截止频率

给出了部分填充手征煤质的圆波导的色散方程，研究了填充材料的电磁参数和尺寸对传播模式截止频率的影响，计算结果表明材料的电磁参数和尺寸可以在很大的范围内调节传播模式的截止频率．     

电子柔性复合功能薄膜研究

探讨了现代电子复合功能材料科学中，柔性复合功能薄膜的结构概念、功能原理与特性价值。研究了现代电子柔性复合功能薄膜的基本原则、柔性特性表征；并从两相柔性复合体系弥散模型对复合压电铁电性机理进行了有效解释，理论与实验一致。