广西产业集聚现状及对策研究

产业集聚是产业活动在空间的集中现象,对区域经济发展有着较强的促进作用。为测度广西产业集聚情况,分析其对经济发展的影响,计算了广西产业地方专业化指数和区域分工指数,并与全国其他省、市、区进行了比较,分析了广西近5年的产业集聚发展趋势。结果显示,广西产业集聚水平较低、优势产业较少且结构不合理,同时区域分工水平较低,但从趋势来看强势产业集聚程度开始增强。根据广西产业集聚现状,提出了相应的对策建议。     

ON THE CHANGE POINT OF THE MEAN RESIDUAL LIFE OF SERIES AND PARALLEL SYSTEMS

This paper considers the mean residual life in series and parallel systems with independent and identically distributed components and obtains relationships between the change points of the mean residual life of systems and that of their components. Compared with the change point for single components, should it exists, the change point for a series system occurs later. For a parallel system, however, the change point is located before that for the components, if it exists at all. Moreover, for both types of systems, the distance between the change points of the mean residual life for systems and for components increases with the number of components. These results are helpful in the determination of optimal burn-in time and related decision making in reliability analysis.     

超宽带自组网中基于定位辅助的路由

将超宽带定位技术应用于超宽带自组网路由算法,通过定位得到网络拓扑,以距离作为路由查找的度量标准之一,限制了路由请求的范围,从而降低了网络的洪泛开销。超宽带精确定位的特点以及距离策略的运用使得路由算法的性能很大程度上得以改进,使用OPNET进行仿真实验证明了所提出算法的有效性。     

Simple and accurate inference for the mean of the gamma model

The two-parameter gamma model is widely used in reliability, environmental, medical and other areas of statistics. It has a two-dimensional sufficient statistic, and a two-dimensional parameter which can be taken to describe shape and mean. This makes it closely comparable to the normal model, but it differs substantially in that the exact distribution for the minimal sufficient statistic is not available. Some recently developed asymptotic theory is used to derive an approximation for observed levels of significance and confidence intervals for the mean parameter of the model. The approximation is as easy to apply as first-order methods, and substantially more accurate.     

对“点警制”的回顾与理性思考

结合"点警制"的产生及主要内容、产生的效果及不同评价,说明"点警制"在理论上和实践中存在的问题:"点警制"客观上缺乏充足的理论依据、"点警制"不符合公安机关的性质和特点、"点警制"的目标定位不准。但发现问题并不是就否定了其积极意义,如何在立法和实践中完善它应当成为研究重点。     

关于 G.Birkhoff的两个问题(英)

以弱射影为工具，将Birkhoff的问题72和73推广到DeMorgan代数上，得到的主要结果为：1．DeMorgan代数的以任意同余理想为核的同余关系唯一的充要条件是此DeMorgan代数为弱可补的．2．DeMorgan代数的同余格为布尔代数的充要条件是此DeMorgan代数有限．     

Quelling Cabin Noise in Turboprop Aircraft via Active Control

Cabin noise in turboprop aircraft causes passenger discomfort, airframe fatigue, and employee scheduling constraints due to OSHA standards for exposure to high levels of noise. The noise levels in the cabins of turboprop aircraft are typically 10 to 30 decibels louder than commercial jet noise levels. However, unlike jet noise the turboprop noise spectrum is dominated by a few low frequency tones. Active structural acoustic control is a method in which the control inputs (used to reduce interior noise) are applied directly to a vibrating structural acoustic system. The control concept modeled in this work is the application of in-plane force inputs to piezoceramic patches bonded to the wall of a vibrating cylinder. The goal is to determine the force inputs and locations for the piezoceramic actuators so that (1) the interior noise is effectively damped; (2) the level of vibration of the cylinder shell is not increased; and (3) the power requirements needed to drive the actuators are not excessive. Computational experiments for data taken from a computer generated model and from a laboratory test article at NASA Langley Research Center are provided.     

一条磨光的拟合曲线

本文是通过对类似直角梯形的曲线进行磨光,而构造的一条光滑拟合曲线。     

Nonparametric repeated significance tests for one-way anova with adoptation to multiple comparisons

Based on two-sample rank order statistics, a repeated significance testing procedure for a multi-sample location problem is considered. The asymptotic distribution theory of the proposed tests is given under the null hypothesis as well as under local alternatives. A Bahadur efficiency result of the repeated significance test relative to the terminal test based solely on the target sample size is presented. In the adaptation of the proposed tests to multiple comparisons, an asymptotically equivalent test statistic in terms of the rank estimators of the location parameters is derived from which the Scheffé method of multiple comparisons can be obtained in a convinient way.     

浅谈高校后勤文化建设的角色定位

随着后勤社会化改革的不断深入,高校后勤文化建设日益受到关注,把握时代方向、找准角色定位是做好这项工作的一个首要任务.本文从高校后勤文化的内涵和特点入手,探讨了它与外部文化环境的横向关系,进而提出了增强后勤队伍素质、建设知识文化软环境的几点建议.