Magnetic Performance of the Main Superconducting Magnets for the LHC

The field strength and homogeneity of all the LHC superconducting magnets were measured as a part of the production control and qualification process that has taken place during the past four years. In addition to field measurements at room temperature performed on the integral of the production, a significant part of the magnets has been subjected to extensive magnetic measurements at cold. The measurements at cryogenic temperatures, generally performed up to excitation currents of 12 kA corresponding to the ultimate LHC energy of 7.6 TeV, were mainly based on static and dynamic field integral and harmonic measurements. This allowed us to study in detail the DC effects from persistent current magnetization and long-term decay during constant current excitation. These effects are all expected to be of relevance for the field setting and error compensation in the LHC. This paper reports the main results obtained during these tests executed at operating conditions. The integrated field quality is discussed in terms of distribution (average and spread) of the field strength and low-order harmonics as obtained for all the main ring magnet families (dipoles, main and matching quadrupoles). The dependence of field quality on coil geometry, magnet and cable manufacturer is analyzed. A projection of the field quality expected for the critical components in the machine is presented.     

功率裸芯片的质量与可靠性保证方法

论述了常规裸芯片质量与可靠性保证的标准和技术,针对功率器件裸芯片,提出了高性能和高可靠性设计、制造工艺保障、验证筛选等质量与可靠性保证方法和技术途径;讨论了采用临时封装夹具技术,对功率裸芯片进行热敏参数筛选、结温控制老化筛选、高温高压反偏筛选等,最终实现对功率裸芯片100%的筛选,满足MCM和HIC对功率裸芯片的质量与可靠性要求。     

Performance Evaluation of a Power Management Scheme for Disruption Tolerant Network

Disruption tolerant network (DTN) is characterized by frequent partitions and intermittent connectivity. Power management issue in such networks is challenging. Existing power management schemes for wireless networks cannot be directly applied to DTNs because they assume the networks are well-connected. Since the network connectivity opportunities are rare, any power management scheme deployed in DTNs should not worsen the existing network connectivity. In this paper, we design a power management scheme called context-aware power management scheme (CAPM) for DTNs. Our CAPM scheme has an adaptive on period feature that allows it to achieve high delivery ratio and low delivery latency when used with Prophet, a recently proposed DTN routing scheme. Via simulations, we evaluate the performance of the CAPM scheme when used with the Prophet routing scheme in different scenarios e.g. different traffic load, node speeds and sleep patterns. Our evaluation results indicate that the CAPM scheme is very promising in providing energy saving (as high as 80%) without degrading much the data delivery performance.     

软件第三方定型测评与质量保证

软件第三方定型测评是装备配套软件研发过程中的重要环节,对软件质量保证至关重要。加强对软件第三方测评的质量监控,能够提高软件可靠性,从而大大提高装备效能。文中介绍了软件第三方测评的相关知识、软件质量保证的方法以及二者之间的关系,并以典型电子信息系统软件的定型测评为例进行了验证。验证结果表明,软件第三方定型测评可以使该系统软件质量得到保证和提高。     

浅析电能质量及其管理

主要介绍电能质量的概念及如何进行电能质量的管理。     

面向电网业务质量保障的5G高可靠低时延通信资源调度方法

该文研究面向电网业务质量保障的5G 高可靠低时延通信(URLLC)的资源调度机制,以高效利用低频段蜂窝通信系统内有限的频谱和功率资源来兼顾电力终端传输速率和调度时延、调度公平性,保障不同电力业务的通信质量（QoS）。首先,基于URLLC的高可靠低时延传输特性,建立电力终端多小区下行传输模型。然后,提出面向系统下行吞吐量最大化的资源分配问题模型并对其进行分步求解,分别提出基于定价机制与非合作博弈的功率分配算法和基于调度时延要求的改进比例公平算法（DPF）动态调度信道资源。仿真结果表明,提出的资源调度方法能在保证一定传输可靠性和公平性的条件下降低电力终端调度时延,满足不同业务等级的QoS需求,与已知算法对比有一定的优越性。     

电网电能质量分析评价技术研究

文中论述电能质量分析及其评价准则,电力谐波问题及其治理技术。     

KGD质量和可靠性保障技术

通过裸芯片可靠性保障技术研究,在国内形成了一部完整的已知良好芯片(KGD)质量与司靠性保证程序,建立了从裸芯片到KGD的质量与可靠性保证系统,确立了裸芯片测试、老化和评价技术,实现了工作温度为-55～ 125℃的裸芯片静态、动态工作频率小于100MHz的测试和工作频率小于3MHz的1 25℃动态老化筛选,可保障裸芯片在技术指标和可靠性指标上达到封装成品的等级要求.     

汽拖起动机试验用蓄电池模拟电源设计

提出一种用电气设备取代蓄电池进行起动机性能试验的技术方案,实施这一方案不仅可以减少由报废蓄电池带来的资源浪费,还能减轻对环境的污染,省去充电机及不断充电带来的麻烦,是值得国内数十家起动机生产企业予以考虑的改革措施.该方案电气线路简单、所用元器件不多,由单片机进行自动控制,有较高的智能性,操作简便.无需培训即可掌握.     

论绩效评估中的全面质量管理

本文从案例分析角度入手,剖析了绩效考核中存在的问题,引出绩效考核中全面质量管理的概念,并且从全面的、全过程的、全员参与的、全方法的四全角度出发,论述了提高绩效管理的新思路.     

Prediction of Wide-Band Power Performance of MESFET Distributed Amplifiers Using the Volterra Series Representation

The power performance of a four-section MESFET distributed amplifier is predicted over the frequency range 2-8 GHz. The nonlinear model of the MESFET used has three nonlinear elements: g/sub d/, and C/sub gs/, which are represented by power series up to the third order. The analysis employs the Volterra series representation up to the third order. Experimental verification is first made on a 0.5x400-µm medium-power MESFET device to confirm the validity of the nonlinear model used in the analysis. The agreement between predicted and measured output power at 1-dB gain compression is within +-0.5 dBm across the 2-16 GHz band. A four-section distributed amplifier was then built with four 0.5x400-µm MESFET's. The agreement between predicted and measured output power at 1-dB gain compression of this amplifier is within +-0.7 dBm across the 2-8-GHz band. The measured output power at 1-dB gain compression is (22+-1) dBm across the 2-8-GHz band.     

Experience on Pre-Series and Series Production of LHC Dipoles Cold Masses in ASG Superconductors

In 1986 Ansaldo Magnet Dept. (now ASG Superconductors) started, in cooperation with CERN, the design activities of the first 1 m-8 T LHC prototype dipoles. After several design steps and the manufacturing of 1+3 prototype dipoles 10 m long, the final design configuration 15 m long was defined by CERN. During the following years, a very close collaboration with CERN engineers and technicians lead to define the parameters about the most critical manufacturing processes, in particular winding of s.c. cable, collaring of coils, cold mass welding and test procedures. In the meantime, installation and commissioning of all the manufacturing plants followed: winding machines, curing presses, collaring press and welding press were installed, as well as geometrical measurements stations and vacuum chamber for leak test. Finally two manufacturing halls were fully dedicated to LHC dipoles production. At the beginning of year 2002, all the manufacturing plants were coming to be operational, ready to start the large scale production of LHC cold masses: 30 pre-series, 386 series and 30 spare cold masses have been produced till May 2007, to get a total number of 446 cold masses. In this paper we summarize all the data collected during a five years production: main manufacturing data, test results and production rate are presented. Final results about tests performed at CERN in superfluid He at 1.9 K are also included as well as correlation between test result and manufacturing rate.     

电信网络管理质量的分层评价模型

基于电信网络管理的内容和特点,给出了网络管理质量的定义,提出了一个网络管理质量的分层评价模型,并根据此模型探讨了网络管理质量的评价流程。     

软件外包的质量保证流程研究及应用

该文主要研究企业内部如何建立可行的外包工作流程,使得企业在整个外包过程中免去不必要的成本并保证软件质量,从而对外包软件进行有效的质量控制和保证,最后在实际试点项目中应用该流程并进行效率分析。     

ISO9001质量管理体系审核结果评定的探讨

本文把价值工程的原理运用于对组织ISO9001:2000质量管理体系审核结果评定中,建立了质量管理体系的评价方法和程序,确定了评价指标、加权值、满足度标度值和质量管理体系符合性指数标准值,然后根据加权值和评价的满足度值,计算出质量管理体系符合性评价指数,最后对照质量管理体系符合性指数标准值对质量管理体系进行了比较客观和科学的定量评价.     

质量管理体系有效性的模糊综合评判

论述了质量管理体系有效性评价的内涵,以某研究所为例,运用模糊综合评判方法,对质量管理体系进行了客观、科学的评判,从中发现薄弱环节,对该所体系文件的改进及行业质量工作的提升提供参考。     

ITU-T P系列语音质量评测标准综述

国际电信联盟ITU组织制定的一系列标准,已成为计算机多媒体应用最广泛的国际标准之一.其中ITU-T P系列标准是针对语音质量评测的标准,该系列标准按照测试方法不同,主要分为主观测试和客观模型两大类,分类简介各标准.