First measurements of the performance of the Barrel RPC system in CMS

During the summer 2006, a first integrated test of a part of the CMS experiment was performed at CERN collecting a data sample of several millions of cosmic rays events. A fraction of the Resistive Plate Chambers system was successfully operated. Results on the RPC performance are reported.     

多对多RPC设计模型研究

提出了多对多ＲＰＣ模型，讨论了该模型各部分的结构以及服务请求对象的内容。为了防止一个Ａｇｅｎｔ－ｇｒｏｕｐ超载，我们提出了两种多Ａｇｅｎｔ－ｇｒｏｕｐ方法。     

A preliminary study of RPC for repair and retrofitting materials

Abstract

This study aims to assess the performances of reactive powder concrete, RPC, as a new repair and retrofitting material and evaluate its durability in concrete members. One accelerated aging environment, namely a freeze‐thaw cycle acceleration deterioration test, was selected for the durability study of the repair materials. Before and after aging, the samples were evaluated by the bond strength (slant shear test), rebar pull out strength, and relative dynamic modulus NDT tests.

The test results show that the RPC displayed excellent repair and retrofit potentials, as it possessed high strengthening effect, bond strength, dynamic modulus and durability, as compared with other concretes. Using RPC or CFRP (carbon fiber reinforced plates) for strengthening concrete members one can obtain specific retrofit effects, but the costs are extremely different for these two materials.     

配有RPC预制管混凝土组合柱的RC框架抗震性能分析

在活性粉末混凝土(Reactive powder concrete,RPC)预制管内浇注混凝土,并在RPC预制管和内部混凝土中均配置纵向钢筋,形成一种新型组合柱——RPC预制管混凝土组合柱。采用平截面假定,并结合已有的RPC、混凝土和钢筋材料本构模型,推导了该新型柱大偏压受力状态的承载力计算式。分别采用该承载力计算式和Opensees纤维模型对两种截面的新型柱承载力进行了对比分析,两种方法的计算结果较为接近。基于柱梁承载力比、RPC预制管中钢筋等级等参数,采用Opensees纤维模型分析了配有该新型柱的RC框架的抗震性能。结果表明:当RPC预制管中配置的钢筋等级提高至HRB400及以上时,结构耗能能力和延性系数均有较大程度的提高;当柱梁承载力比不超过1.2时,随柱梁承载力比的增加,结构抗震性能改善效果不明显,而当柱梁承载力比为1.5及以上时,结构抗震性能随柱梁承载力比的增加会有明显的提升。     

新型光纤电流传感器的研制

光纤电流传感器运用Faraday效应,将光纤绕在电流母线上可以方便地测得电流母线中的电流,但光纤电流传感器的信号受环境振动、温度变化的影响严重,从而限制了其应用。本文从分析振动、温度变化的干扰机理出发,提出一种新型的在线校正方法来抑制干扰的影响,并进行了原理性实验。研究结果表明,用这种方法实现的光纤电流传感器在40～400A之间有良好的线性度和精度。     

一种激光探测与波长测定装置的研究

介绍了一种主要用于夜间的激光探测与波长测定装置，它是基于激光在光学劈尖上产生干涉条纹的特点、通过傅里叶变换测定条纹间距来计算激光波长的，测试结果表明该装置在背景光微弱的情况下，性能令人满意，具有一定的实用性。     

一种ICP-MS真空测量系统的研制

本文介绍了一种基于C8051F微控制器并应用于电感耦合等离子体质谱仪(ICP-MS)的真空测量系统。系统由真空计组、预处理电路、C8051F微控制器、串行接口和上位机组成,能同时测量接口、透镜和四级杆三个部分的真空状态,且具有较高的集成度,紧凑的体积和较低的功耗,经最后实验证实,系统能准确且稳定的测量各个部分的真空度,可为ICP-MS的正常工作提供相应的条件保障。     

The dynamic error of a multichannel measurement system

It is shown that the dynamic error of a multichannel measurement system containing a single analog-to-digital converter with signal source switching is not dependent on the signal waveform and is governed by the rate of change. Translated from Izmeritel’naya Tekhnika, No. 1, pp. 3–6, January, 2009.     

Some developments for a unit magnification catadioptric optical system

Some structural improvements in the 1:1 Wynne-Dyson catadioptric system are described. The improvements make the 1:1 Wynne-Dyson system usable in the deep-UV regime and broad bands and high numerical apertures become possible.     

激光板凸度检测系统传感器位置调节方法

分析激光板凸度检测原理,根据测量间隙参数的变化,建立检测系统传感器位置状态表,将系统中传感器的位置关系分为正间隙、有效负间隙、无效负间隙三类。三种关系下系统的测量范围分别为:1)4mm以上;2)0-4mm;3)不能测量。由此提出一种传感器位置调节方法,以位置状态表作为调节判据,运用伺服跟踪技术,在检测过程中使传感器自动处于最佳的位置关系,实现检测的智能化。差动式厚度试验表明,本方法具有高效、精确、自动化程度高的特点,位置调节精度达到±1μm。     

有机/聚合物LED弱电流自动测试装置

介绍一种用于有机/聚合物LED微弱电流的自动测量装置。装置将测量参数估计理论与T形负反馈电阻网络相接合以实现高准确度微弱电流自动测量。装置电流测量范围为1fA—100mA；测量准确度为0．1％-10％R；分辨率为1fA；极限灵敏度为0．5fA。测量数据通过标准接口传输，经自动数据处理后，可提供微弱电流各分量频率谱、幅值相位谱以及随机过程的统计参数分析。     

玩具检测用温升测试系统的设计

该文针对电玩具的温升测试,详细介绍8通道温度测量系统的硬件和软件设计。热电偶信号经AD595芯片放大调理和A/D转换,通过单片机进行处理,再连接到PC机进行显示和操作。     

The special state standard of the unit of frequency deviation

The main characteristics of a new special state standard of the unit of frequency deviation are described.Translated from Izmeritelnaya Tekhnika, No. 1, pp. 36–39, January, 2005.     

半导体基片表面微小高温区域的红外测温系统

利用红外辐射测温原理，设计成半导体基片上激光焦斑温度不接触测量系统。该系统由透镜成像系统、探测器、精密电动平台及相关电路和软件组成，其测温范围大，温度分辨力可达0．2K，还可得到温度-时间关系曲线；可自动测量热斑的温度分布及寻找热斑的最高温度区域；测量区域的最小直径为18μm。     

双重磁检测器电流比较仪的开环特性研究

介绍了一种全新的直流大电流测量方法 ,这种方法是基于磁调制器和磁放大器双重磁检测器原理。文中对这种双重磁检测器的开环特性进行了理论计算和试验测试。理论计算和试验测试均表明其开环传输特性只有零安匝一个过零点 ,克服了传统磁调制器的开环传输特性曲线有若干过零点的缺陷和弊端 ,大大提高了系统闭环后的稳定性和可靠性 ,且在零安匝附近灵敏度高、线性好 ,同时具备了磁调制器和磁放大器的优点     

A new self-calibration method for electronic current transformers

Compared with traditional current transformers (CTs), electronic current transformers (ECT) have the following advantages: (1) no saturation problem, (2) wider measurement range, (3) smaller footprint, (4) lighter weight, and (5) easier for digitization. Hence, the ECT is one of the critical components in the development of intelligent substations. Since the majority of the sensing elements of ECTs are semiconductor materials, their accuracy and sensitivity are influenced by the ambient temperature. Moreover, the quiescent output voltage of the semiconductor-based ECT is also affected by the ambient temperature. This paper proposes a self-calibration method with the ability of quiescent-output-voltage compensation and sensitivity compensation. The proposed design can automatically adjust the quiescent output voltage and the sensitivity variation when the temperature changes. The experimental test results demonstrate that an ECT with the proposed self-calibration method can achieve Class 0.5 for measuring CTs and Class 5P20 for protective CTs.     

The design and mass production on Resistive Plate Chambers for the BESIII experiment

A new type of the phenolic paper laminate is used as the resistive electrodes of BESIII RPC. The surface smoothness of these laminates is comparable to that of the bakelite plates with linseed oil treating. A technique to adjust the bulk resistivity of the laminates within the range of 10⁹–10¹³ Ω cm is developed. Nowadays, about 1000 bare chambers (1200 m²) have been produced and used for BESIII MUON, and the rejection rate is only 1.5%. In this paper, we will discuss the mass production and quality control procedures of these RPCs.     

Lifetime replacement policy in discrete time for a single unit system

We consider, in discrete time, a single unit system which operates for a period of time represented by a general distribution. This unit is subjected to failures during operations. Some of these failures are repairable and the unit is repaired in the repair facility. When the unit experiences a non-repairable failure then it has to be replaced with a new one. We consider a replacement policy based on the lifetime of the unit. This policy can be studied from two different approaches. The first approach, named Model I, is to replace the unit by a new one when the unit attains a predetermined lifetime. The other approach, named Model II, is to close repair facility when the lifetime of the unit attains a predetermined quantity. For each model, we obtain the stationary distribution and some performance measures of interest.     

一种新型光纤电流传感器的设计

本文提出了一种新型的高压电流光纤传感器 ,该系统由具有相位压缩原理的Sagnac干涉仪光路构成 ,与通常的干涉仪相比该系统的动态测量范围扩大数百倍 ,而且系统不受外界缓变量的影响 ,系统采用相位切换技术使干涉仪保持在正交干涉状态