Eigenstructure assignment by decentralized output feedback-acomplete parametric approach

The problem of eigenstructure assignment in multivariable linear systems by decentralized output feedback is considered. By using a complete parametric solution of a generalized Sylvester matrix equation, parametric representations of both the left and right closed-loop eigenvectors and generalized eigenvectors as well as the feedback gains with respect to the closed-loop eigenvalues and two series of partially free parameter vectors are established. The obtained result does not require any conditions on the closed-loop eigenvalues, and generalizes some previous results in this area. An example shows the effect of the proposed approach     

Dynamic contributions to the DNA binding entropy of the EcoRI and EcoRV restriction endonucleases

Molecular Dynamics simulations on DNA-EcoRI and DNA-EcoRV complexes suggest that the DNA within these complexes is significantly more ordered than free DNA. Similarly, both the protein and the DNA are more ordered in the specific (cognate) DNA-EcoRV complex than they are in the non-cognate DNA-protein complex, consistent with recently proposed analogies between protein folding and sequence-specific DNA-protein recognition. Analysis of the trajectories shows that the net entropy gain upon specific binding to be the result of opposing contributions. Solvent release, which increases entropy versus configurational terms (as measured by the magnitude of the atomic fluctuations), and collective terms from tight coupling between the motions of the protein and the DNA.     

填料萃取塔液泛速度的计算

介绍了三种有代表性的填料萃取塔的液泛速度计算公式，并通过它们用于三种典型的液-液实验体系和两种不同填料的计算结果的比较，对这些公式的适用范围进行了讨论。     

钢带捆扎对木箱强度的影响

从力学角度分析了钢带捆扎对木箱强度的影响，指出木箱经钢带捆扎后，可减小箱底的最大弯矩，提高木箱的承载能力和减少板厚。同时还在无支撑间隔的基础上，详细介绍了钢带捆扎的设计方法。     

先进电子化政府基本模式及实现

电子化政府是运用信息技术创新政府服务的整合概念。建构电子政府已经成为世界范围内政府再造的新趋势。这里讨论了电子化政府基本模式及规划的内容和特点,并具体提出实现的模式、技术路径及方法。     

测量输入光窗台阶指标的指示表的选择

阐述了对近贴聚焦型微通道板像增强管中输入光窗台阶高度和平整度指标进行测量时，所用指示仪表的选择依据，并详细分析了指示表在检定过程中的误差来源，进一步计算出其合成标准不确定度和扩展不确定度，从而选定可用于测试的指标表。     

天楼地枕水电站的综合自动化改造

天楼地枕水电公司为实现水电站"无人值班,少人值守"的目标,对水电站进行了综合自动化改造,论述了该自动化系统的结构特点及实施情况.     

IPv6 delay and loss performance evolution

Although packet delay and loss are two important parameters of the Internet performance, to the best of our knowledge, the evolution of large‐scale IPv6 delay and loss performance has previously not been studied. In this paper, we analyze more than 600 end‐to‐end IPv6 paths between about 26 testboxes of RIPE Network Coordination Centre over two years, and compare the delay and loss performance over time with their IPv4 counterparts. We present and discuss the measurement methodologies and show that IPv6 paths have a higher delay and loss than their IPv4 counterparts. The main reason for the worse performance stems from IPv6‐in‐IPv4 tunnels rather than from native IPv6 paths and such tunnels are still widely used today. Copyright © 2007 John Wiley & Sons, Ltd.     

苯乙烯类嵌段共聚物的生产及市场分析

介绍了苯乙烯类嵌段共聚物(SBC)的国内外生产和消费情况，分析了我国SBC的市场前景，提出了加大研发力度、提高SBC生产术、扩大生产规模、提高国内市场占有率，建设多功能装置等建议。     

对增量CRL应用的一些研究

本文对PKIX依从系统中增量CRLs的应用进行了一些研究，包括：增量CRL的时间跨度对性能的影响及其最优选择；基于完全CRL与增量CRL检查证书状态以及构造新的完全CRL的算法。