STABILITY CRITERIA FOR A CLASS OF UNCERTAINSYSTEMS WITH TIME—DELAY

Some stability criteria are obtained for a class of uncertain systems with time-delay usingLyapunov functional and analytic techniques. It is easy to check the criteria by making use of theboundedness of the uncertainties.     

静电屏蔽物理原理

本文从电场强度、电势两方面探讨了静电屏蔽的物理原理以及静电屏蔽的实质。     

Technical Notes ：STUDIES ON THE VALUE OF SECONDARY MARKET TO THE SUPPLY CHAIN

This paper investigates the impact of a secondary market, where retailers can buy and sell excessinventories, on the supply chain. We develop a two-period model with a single manufacturer and tworetailers. At the beginning of the first period the retailers order and receive products from themanufacturer, but at the beginning of the second period, they can trade surplus products betweenthemselves in the secondary market. We investigate the impact of the correlated dependence ofretailers' demand on both the quantity effect and the allocation effect under the secondary market.Lastly,we study potential strategies for the manufacturer to increase sales with the existence of thesecondary market.     

双基地声纳定位精度和算法研究

根据双基地声纳定位的特点，提出了一种单纯基于声波到达时间(TOL)的双基地声纳定位算法，给出了算法的原理和误差分布。通过数值仿真，研究了基线长度、时间测量误差对算法定位性能的影响。仿真结果表明，TOL算法的定位精度与基线长度有关，随着基线长度的增加，定位精度提高。时间测量误差对算法的定位精度影响较小。与同等条件下单基地声纳定位相比，双基地TOL算法具有更高的定位精度。该研究为多基地声纳新体制的建立，提供了理论依据。     

北京市旅游产业发展战略研究

用灰色系统关联分析方法 ,测算了北京市旅游产业及三个主要旅游行业经济要素对收益的关联序 ,找出了各行业发展的关键因素和优势因素 ,进而以此为依据提出了旅游产业投资的方向和重点 .     

广谱型C60修饰电极电位传感器的研究

吸附型Ｃ６０修饰玻碳电极可作为一种广谱响应的电位传感器，对十余种无机及有机季铵盐阳离子，其电位－浓度对数值呈一定的线性关系，该电极制备方便、响应速度快，稳定性好。本文还从电极表面Ｃ６０晶型结构出发，对电极的响应机理进行了初步探讨。     

微波等离子体离子化检测器研究

本文采用氢气为载气和等离子体工作气体，以苯和二氧化碳为例，对不同电离电位样品组分经过和不经过等离子体两种样品引入检测器方式进行了详细的对比研究，发现检测器分别具有质量型和浓度型检测器的响应特征．探讨了空气引人等离子体对检测器分析性能的影响．     

FROM MANUFACTURING SCHEDULING TO SUPPLY CHAIN COORDINATION：THE CONTROL OF COMPLEXITY AND UNCERTAINTY

With time-based competition and rapid technology advancements, effective manufacturingscheduling and supply chain coordination are critical to quickly respond to changing marketconditions. These problems, however, are difficult in view of inherent complexity and variousuncertainties involved. Based on a series of results by the authors, decomposition and coordination byusing Lagrangian relaxation is identified in this paper as an effective way to control complexity anduncertainty.A manufacturing scheduling problem is first formulated within the job shop context withuncertain order arrivals, processing times, due dates, and part priorities as a separable optimizationproblem. A solution methodology that combines Lagrangian relaxation, stochastic dynamicprogramming, and heuristics is developed. Method improvements to effectively solve large problemsare also highlighted. To extend manufacturing scheduling within a factory to coordinate autonomicmembers across chains of suppliers, a decentralized supply chai     

精馏塔理论塔板数计算方法的评述及其新的简捷算法——图算法

化学工程中精馏塔的理论塔板数N是塔器设计的一个重要数据。它与最小回流比R_m、回流比R及最小理论塔板数N_m间具有一个复杂的函数关系,故其计算是相当麻烦的。本文对现有的各种较为简捷的算法进行了评述,并提出了一种极为简捷的算法——图算法。利用此法,无需进行数值计算,只用两条直线即可简捷地求出准确的结果。     

盲信号分离的自稳定算法

在传统盲分离算法的迭代过程中，为了保证分离矩阵的行正交性，都要对其进行反复的正交化，以避免算法的不收敛。针对这个问题，笔者主要研究了在Stiefel Manifold上的盲分离算法，该算法使分离矩阵不需要每一步都进行正交化。仿真表明，本文提出的新算法具有很好的稳定性。