A comparative study of exchange and aggregation models in the B2B e-marketplace

This research seeks to provide an economic framework for understanding two major forms of e-marketplaces: aggregation-oriented vs. exchange-oriented e-marketplaces. By analyzing the marginal benefit per transaction in alternative models, we are able to determine the most suitable B2B e-marketplace for a wide variety of product categories, market conditions, and procurement methods. For example, when companies sell commodities in a fragmented market, the aggregation model is suitable for spot purchasing, and the exchange model works best for systematic purchasing. In addition, the effect of supplier consolidation and information technology-enabled cost reduction on model selection is discussed.     

HL-2A Tokamak Edge Modeling with B2

The outer divertor plasma of HL-2A and its associated scrape-off plasma have been simulated using a two-dimensional multi-species fluid code of Braams with a simplified neutral gas model. HL-2A has a double-null closed divertor in separate divertor chambers above and below the nearly circular plasma tours. The computed numerical grid is developed according to an ideal magnetic surface. The calculation is involved only with pure hydrogen plasma. The emphasis has been focused on parametric studies involving variation of the assumptions made for the core plasma. The peak temperatures and the heat flux near the target are of the principal concern。     

Application of N-succinimidyl 4-[(18)~F](fluoromethyl) benzoate to protein labeling

N-succinimidyl 4-[18F](fluoromethyl) benzoate for protein labeling was prepared (57%, EOB) in about 30min. Reaction conditions of S18FMB with IgG including pH of solutions, protein concentration, reaction temperature and time were studied. The optimal labeling conditions were: 0.2mg/mL IgG, pH = 7.8-8.5, 25℃, and reaction time 5min.Under these conditions the yield was about 80%. The 18F-labeled protein was purified by size exclusion chromatography.     

基于C／S的CAD协同设计环境的产品数据管理技术

数据管理系统是ＣＡＤ协同设计环境核心系统之一。此文介绍了基于Ｃｌｉｅｎｔ／ＳｅｒｖｅｒｒＣＡＤ协同设计环境的数据管理关键技术，看重介绍了数据的模型结构和组织，数据库设计，版本管理，配置管理，数据安全性及一致性控制等内容。最后对系统实际应用效果进行了评价。     

基于LabVIEW的浑浊度数字化测试仪设计

本文将虚拟仪器技术与光频转换器件TSL230B相结合,设计新型浑浊度数字化测试仪.阐述该系统的工作原理、硬件构成及软件设计方案;实现浑浊度的自动在线测量.实验结果表明,该仪器数据处理能力强,图形化显示直观,保存与打印结果方便,测量的重复性好,精确度高.     

一种基于本体论的照片注释技术

介绍了本体论的概念，然后以动物照片为例建立了用于照片注释的本体论，并用一种类RDF Schema格式的文件表示；最后用JAVA程序实现对照片进行注释，生成RDF格式的注释文件，便于照片信息的快速高效再利用。     

含硼微合金钢的静态及动态软化行为

运用gleeble-1500热模拟试验机November对含硼微合金钢进行了单、双道次压缩模拟,并通过非线性回归分析得到了静态与动态软化百分比(X)与变形温度(T)、变形程度(ε)、变形速率(ε·)、原始晶粒尺寸(d0)、道次间隔时间(t)之间的关系。     

高校MIS系统架构与安全实现

探讨了采用B/S网络结构模式的高校校园网MIS架构及其安全实现.     

A control model for an insurance company

The activity of an insurance company with a reinsurance condition system is modeled on an infinite time interval. Payment times and sums insured are random. The amount of money replenished is selected as a control parameter. The task is to minimize the average insurance payment per unit time, thus optimizing investments.Translated from Kibernetika i Sistemnyi Analiz, No. 6, pp. 172–176, November– December 2004.This revised version was published online in April 2005 with a corrected cover date.     

Growth and optical properties of Er,Yb:YAl3(BO3)4 crystal

Single crystal of erbium, ytterbium-codoped yttrium aluminum tetraborate Er,Yb:YAl₃(BO₃)₄(Er,Yb:YAB) has been grown by the flux method. The absorption spectrum in the visible and NIR regions of Er,Yb:YAl₃(BO₃)₄ crystal are measured at room temperature and fluorescence spectrum of Er,Yb:YAl₃(BO₃)₄ crystal are also measured at room temperature, excited by 976 nm laser. Not only the strong NIR emission peaks located at 1548 nm was observed, but also the visible up-conversion luminescence has been found. The specific heat of the Er/Yb:YAB crystal at room temperature is 0.81 J/g °C.