南京ATM宽带多媒体网络的建设

ＡＴＭ技术在经济ＩＴＵ－Ｔ和ＡＴＭ论坛多年的研究与论证后,已开始在多个领域得到广泛运用。本文介绍了南京市ＡＴＭ的网络的建设情况,包括基本组成、网络业务及网络的测试等。     

当前美国的信息产业政策

在当前的网络经济下,推动经济增长的力量 不再是自然资源而是能够改变现有社会和经济关系的信息资源。作为当今信息化程度最高的美国近年来积极调整政策法规以适应信息社会和自身发展的需要。     

On the measurement of friction coefficient utilizing the ring compression test

The main objective of this research was to investigate whether generalized friction calibration curves, as recommended in the literature for use with ring compression tests, are applicable to all types of materials and test conditions. Specifically, the effects of material properties, strain-rate sensitivity, and “barreling” on the behavior of friction calibration curves were investigated. To this end, a series of ring compression tests were conducted in order to determine the magnitude of the friction coefficient, μ, as well as the corresponding calibration curves for two types of modeling materials, white and black Plasticine. The experiments were first conducted using the Physical Modeling Technique (PMT) and then simulated via an elastic–plastic finite element code (ABAQUS). In contrast to the results available in the literature, where the same friction calibration curves are recommended for all types of materials and test conditions, the results of this investigation showed that friction calibration curves are indeed affected by the material properties and test conditions and every material possesses its own distinctive friction calibration curve.     

纳米固色剂Tinokin VG在灯芯绒上的应用探讨

由于灯芯绒产品的特殊性(色泽深浓色多,绒面使摩擦系数增大),灯芯绒织物的摩擦牢度难以提高到较满意的程度。使用Tinokin VG30～40g/L进行浸轧、烘干、焙烘后,可使硫化染料染色的黑色灯芯绒的干、湿摩擦牢度从1～2级和1级分别提高至4级和3级;使活性染料染色的咖啡色及黑色灯芯绒的干、湿摩擦牢度从2级和1～2级分别提高至4级和3级。     

“Digi-code” - A micro computer program to digitize two dimensional figures and convert the data to CNC (Computer Numerical Control) Program

Engraving or machining free-form non mathematically defined shapes can be a complex task. “Digi-code” is a program to read and interpret coordinate location data describing parts or shape outlines. The coordinate data is converted directly to NC (Numerical Control) code to control a CNC (Computer Numerical Control) machine tool. This paper describes a technique to digitize contoured shapes and process the data directly to machine control code.     

A proposed method to use electronic spreadsheets to develop quality control charts

The combination of the personal computer and spreadsheet software provide an inexpensive and accurate capability to use control charts for the quality contol average and standard deviation. The popular spreadsheet program, Lotus 17ndash;2–3, is limited to graphing six variables. Eight are needed to graph both the average and standard deviation control charts on a single screen. This article examines several methods to overcome this limitation. All calculation needed are performed and a series of charts are drawn for the readers examination.     

移动资费套餐面面观

从国外的经验看,资费套餐最早出现在长途业务领域,但真正得到大范围推广是在移动通信领域。目前移动通信公司采用的资费套餐多具备以下的特点:低门槛进入策略,针对不同的用户群、使用时间、使用量采用业务优惠政策,对企业用户采用折扣方案,根据拨打电话对象的属性确定资费套餐,围绕品牌制定资费套餐。美国移动运营商的价格策略基本上分为三类:本地或区域服务方案、全国服务方案和预付费服务方案。     

700 GW: A New Start of Electric Power Industry

On December 4, 2007, unit 1of Taizhou Power Plant was put into operation, which became the symbolic unit of the installed capacity reaching 700 GW in China. On July 31, 2008, sponsored by the National Energy Administration and assisted by the China Electricity Council and the China Guodian Corporation, the “Conferring Ceremony for the 700 GW Symbolic Generating Unit of China“ was held in the Great Hall of the People, Beijing. Zhang Guobao, vice chairman of the National Development and Reform Commission and ...     

巧用PowerBuilder数据窗口

介绍了在利用PowerBuilder开发应用系统过程中，巧用数据窗口的各种特性、对象，增强系统通用性、灵活性的几种使用方法。     

UNCERTAINTIES OF ASPHALT LAYER THICKNESS DETERMINATION IN FLEXIBLE PAVEMENTS-INFLUENCE DIAGRAM APPROACH

The thickness of pavement layers is an important parameter used in Pavement Management Systems (PMS). Thickness data are used for pavement condition assessment, performance predictions, selection of maintenance strategies and rehabilitation treatments, basic quality assessment, and as input to overlay thickness design. Pavement thickness is usually determined from direct testing such core samples, nondestructive testing such as radar, or historical records such as pavements network database. This paper proposes the use of Bayesian Influence Diagrams as a tool in providing a probabilistic model for thickness determination procedure in flexible pavements. The Bayesian Influence Diagram Model is presented as a framework for addressing uncertainties involved in capturing quantitative and qualitative information in the asphalt layer thickness determination procedures. The model is also used to perform value of information analysis in the determination of pavement layer thickness. The Influence Diagram representation facilitates the assessment of coherent prior distributions and makes it easier for knowledge engineers and other decision makers to express and understand more general kinds of dependency and independency assumptions.