青川天然沥青的组成及其沥青质结构参数研究

利用化学分析、X射线衍射分析、红外光谱等方法对四川青川天然沥青的组成及其沥青质晶体结构进行研究。结果表明,该天然沥青样品富含沥青质,矿物质含量较高,属于沥青矿中的脆沥青类;其沥青质X射线衍射图谱中重叠的γ、(002)峰可以用Gauss、Lorentz两种分峰方式进行有效分离,得到的沥青质结构参数与石油沥青质有较大差别,主要体现在芳碳率较小,芳香层堆积平均高度较低,有效芳香层数要比石油沥青质小得多,约为2层左右。     

Experimental validation of connected automated vehicle design among human-driven vehicles

In this paper, we present results regarding the experimental validation of connected automated vehicle design. In order for a connected automated vehicle to integrate well with human-dominated traffic, we propose a class of connected cruise control algorithms with feedback structure originated from human driving behavior. We test the connected cruise controllers using real vehicles under several driving scenarios while utilizing beyond-line-of-sight motion information obtained from neighboring human-driven vehicles via vehicle-to-everything (V2X) communication. We experimentally show that the design is robust against variations in human behavior as well as changes in the topology of the communication network. We demonstrate that both safety and energy efficiency can be significantly improved for the connected automated vehicle as well as for the neighboring human-driven vehicles and that the connected automated vehicle may bring additional societal benefits by mitigating traffic waves.     

Stability analysis on a dynamical model of route choice in a connected vehicle environment

Research on connected vehicle environment has been growing rapidly to investigate the effects of real-time exchange of kinetic information between vehicles and road condition information from the infrastructure through radio communication technologies. A fully connected vehicle environment can substantially reduce the latency in response caused by human perception-reaction time with the prospect of improving both safety and comfort. This study presents a dynamical model of route choice under a connected vehicle environment. We analyze the stability of headways by perturbing various factors in the microscopic traffic flow model and traffic flow dynamics in the car-following model and dynamical model of route choice. The advantage of this approach is that it complements the macroscopic traffic assignment model of route choice with microscopic elements that represent the important features of connected vehicles. The gaps between cars can be decreased and stabilized even in the presence of perturbations caused by incidents. The reduction in gaps will be helpful to optimize the traffic flow dynamics more easily with safe and stable conditions. The results show that the dynamics under the connected vehicle environment have equilibria. The approach presented in this study will be helpful to identify the important properties of a connected vehicle environment and to evaluate its benefits.     

企业网中Microsoft Proxy Server应用研究

文章介绍了Ｍｉｃｒｏｓｏｆｔ ＰｒｏｘｙＳｅｒｖｅｒ系统的应用环境、网络结构、网络产品的选择及应用中的关键技术和网络配置。     

实现控制系统和管理系统数据共享

控制系统和管理系统的数据共享的实现，是开发和建设企业信息管理系统中的一个关键，它的实现有利于企业管理网络的建设和提高企业的管理水平。文章论述了客户机／服务器模式下，利用开放数据库互联（ＯＤＢＣ）技术，实现控制系统和管理系统的数据共享的一种方法。     

基于MCS证书管理机构的研究与实现

文章分析了MCS(Microsoft Cetificate Server）的特征、体系结构及证书申请的处理过程，介绍如何利用MCS来建立证书管理机构CA(Certificate Authority）     

皮层下缺血性脑血管病CT表现与血管性痴呆的相关研究

目的　探讨皮层下缺血性脑血管病CT表现与血管性痴呆之间的关系。方法　对比分析 6 0例皮层下多发脑梗死痴呆者和 6 8例皮层下多发梗死无痴呆者CT表现。结果　痴呆组中额叶皮层下、内囊前肢、尾状核、半卵圆中心前部、侧脑室体旁前部白质及丘脑梗死发生率、平均梗死灶数目及平均梗死体积均大于对照组 (P <0 .0 5 ) ;3级、4级脑白质疏松出现率显著高于对照组 (P <0 .0 5 ) ;脑萎缩指数测量值明显大于对照组 (P <0 .0 5 )。非条件Logistic回归分析额叶皮层下及丘脑梗死灶数目、侧脑室体旁前部白质梗死灶体积、脑白质疏松以及脑皮层萎缩的程度与血管性痴呆的发生显著相关。结论　皮层下多发脑梗死性痴呆与梗死灶的部位、数目、体积和脑白质疏松及脑皮质萎缩的程度密切相关     

IN VITRO CO-STIMULATORY ACTIVITY OF HUMAN B7.2(IgV+C)PROTEIN PRODUCED BY ENGINEERED BACTERIA

It was well known that "two signals" wereboth necessary to activate T lymphocytes. The firstsignal was provided by TCR--CD, which was en-gaged with antigen peptide--MHC complex, and thesecond, also named the costimulatory signal, wasprovided by the interaction between costimulatorymolecules B7. l and B7. 2 on antigen presenting celland its counter--receptor CD28/CTLA4 on T cell.The first signal alone without costimulation willlead T cell to anergy or apoptosis['~'2. B7. 2 mayplay a cri…     

基于Intel PXA26X处理器的BootLoader的设计与实现

介绍了基于PXA26X处理器构造的高端手持嵌入式产品的BootLoader的设计与实现．简要介绍了PXA26X处理器的芯片结构,给出了一种基本手持设备的硬件结构框．说明了BootLoader的整体框架结构,给出流程图,并详细讲解了调试硬件遇到的关键问题和与操作系统配合的方法．     

教务网络管理系统暨选课软件系统实现研究

从开发工具角度分析了基于C/S和B/S结构的教务网络管理系统暨选课系统软件各模块的系统实现。即：采用SQL Server作为后台数据库，后台局域网采用C/S结构，采用VisualBasic作为开发工具，通过引用VisualBasic自带ADO对象作为访问SQLServer的接口。前台浏览器端用ASP技术和Visual Basic开发IIS应用程序实现。