基于被动测试的web应用测量

提出一种新的基于被动测试的web应用测量方法,以便准确、快速的获取应用特征与状态信息。设计了web应用测量协议WMP,并对基于该协议的测量系统进行了设计与实现。实验表明该系统能够准确快速地对待测的应用协议交互部分进行测量,为应用管理提供丰富有效的信息。     

时间分解光谱技术在钢铁分析中的应用

研究了单火花光谱在不同采样时间段分析灵敏度与窗口的关系,P、S、Al、Ni、Ti、B、Mg、Sb、Pb、As、Bi、Ta、Sn应用TRS技术检出限明显降低,而C、Si、Mn、Cr、Mo、V、W、Co、Nb则不显著;合适的采样窗口能提高Sb的分析准确度,Mg则可减少背景波动带来的影响,Cu可扩大分析线性范围;采用TRS技术在诸有效元素中分析灵敏度可提高1.36～5.00倍,能更好地满足品种钢的研究开发与生产检验的需求.     

Note on filon-type integration for higher order exponential time differencing methods in stiff systems

The Filon-type quadrature is efficient for highly oscillatory functions — Fourier transforms. Based on Cox and Matthews’ ETD schemes, the higher order single step exponential time differencing schemes are presented based on the Filon-type integration and the A-stability of the two-order Adams-Bashforth exponential time differencing scheme is considered. The effectiveness and accuracy of the schemes is tested. Foundation item: Projects(02JJY2006, 03JJY2001) supported by Natural Science Foundation of Hunan Province; project supported by JSPS Fellowship Research Program     

Application of advanced core process monitoring procedures in German power reactors

The nuclear reactor core design and the nuclear fuel management have been changed remarkable during the last few years. This development was initiated by increasing costs for the fuel recycling and nuclear waste storage. The fuel material, the fuel pellet fabrication, the fuel assembly structure and the core composition have been varied to get an effective fuel exploitation. Based on advanced core process conditions the reactor power and the fuel burn-up have been increased at German plants in recent years. Improved dynamic process monitoring procedures are required to get more information about the varied core process behaviour during the reactor operation. Since several years ISTec has been performed investigations to the process monitoring based on process signal measurements in German nuclear power plants. Using the standard instrumentation of the plants process signals have been measured and analysed by means of the digital data acquisition system SIGMA. The measured time signals are influenced by core process transients, global and local process fluctuations and by signal line transfer functions. Advanced time series analysis methods have been applied to separate different process effects in the multiple signal matrix. The separation of different process influences can improve significantly the information about the process condition in the reactor core.     

99Tcm-PHY和113Inm-DTPA双核素胃排空显像检查

采用99Tcm-植酸钠(PHY)标记鸡肝(固相)和113Inm-DTPA(液相)混合餐作双核素显像检测受试者的胃半排空时间(T1/2),建立正常值;并对非胰岛素依赖性糖尿病、十二指肠溃疡、功能性消化不良、硬皮病等165例患者的胃排空时间进行检测与分析。结果表明:20例正常对照组液相食物T1/2为25.7～53.7min,平均41.2±9.1min;固相食物T1/2为50.5～100.3min,平均70.5±16.5min。正常上限:液相T1/2为60min,固相T1/2为104min。107例糖尿病患者中有固相食物排空延迟者达47例,占43.9%,并有液相食物延迟者19例,占17.8%。经西沙比利治疗后复查,均见有胃排空的明显改善。硬皮病患者的胃排空延迟最严重,且所占比率达82%。双核素胃排空显像检查尤其是固相食物检查为临床胃排空研究提供了灵敏可靠的检查方法。     

Odyssey: a high‐performance clustered video server

Video servers are essential in video‐on‐demand and other multimedia applications. In this paper, we present our high‐performance clustered CBR video server, Odyssey. Odyssey is a server connecting PCs with switched Ethernet. It provides efficient support for normal play and interactive browsing functions such as fast‐forward and fast‐backward. We designed a set of algorithms for scheduling, synchronization and admission control, which results in a high utilization of resources. Odyssey is able to deliver a large number of video streams. Copyright © 2003 John Wiley & Sons, Ltd.     

新型无机闪烁体CeF3的时间特性研究

CeF3是新型快响应无机闪烁体．对近年国内研制的CeF3无机闪烁体的时间特性进行了研究，包括脉冲辐射诊断所关心的CeF3对快脉冲γ辐射源的时间响应．如上升时间、半高竟、脉冲后沿；同时推算并使用了用脉冲法获得晶体发光衰减常数的简单估算公式，获得的CeF3衰减常数值与国外研究同行其它测量方法得到的结果基本一致。     

The AC losses measurement and analysis of superconducting NbTi CICC for HT-TU superconducting Tokamak

Superconducting TF and PF coils have been measured in SULTAN test facility. Segregated copper strands are included in four NbTi CICC and this is a technical innovation. Two AC losses measurement methods, calorimetric and electromagnetic methods, have been used in the experiments, and a broad frequency range (from 0.05 Hz to 6 Hz) is covered in sample test. The purpose of this experiment was to investigate AC losses of TF and PF CICC conductor including segregated copper and to check the design of PF and TF CICC coated with different resistive barriers (Pb-30Sn-2Sb and Ni plating on NbTi strands).     

电力需求侧管理对终端设备的影响

阐述了提高终端设备能效和建立能效标识制度的重要性，以及实现终端设备分时控制对优化用电方式的重要作用，指出我国节电产品生产厂家亟需采取相应对策以提高终端用电效率和优化用电方式。     

建设项目的投资工期和质量控制

根据监理工作实践，论述了投资、工期和质量的控制，提出控制工期是保证投资效益的重要途径，控制质量是保证工程投资的有效手段；设计阶段是投资控制的重要环节。