利用DPF模拟SGEMP效应的数值计算结果分析

ＳＧＥＭＰ是脉冲Ｘ射线作用在星,弹壳体表面引起的ＥＭＰ现象,结合本所ＤＰＦ的参数及实验设计,本文介绍了利用二维粒子跟踪数值模拟方法进行的Φ２０ｃｍ×２０ｃｍ铝质柱形壳体ＳＧＥＭＰ数值模拟结果,并做以分析说明,为实验测量提供理论依据。     

STIMULATING EFFECT OF LOW DOSE ~(147)Pm ON DNA REPAIR IN SPERMIOGENIC STAGES

ＳＴＩＭＵＬＡＴＩＮＧＥＦＦＥＣＴＯＦＬＯＷＤＯＳＥ~（１４７）ＰｍＯＮＤＮＡＲＥＰＡＩＲＩＮＳＰＥＲＭＩＯＧＥＮＩＣＳＴＡＧＥＳＳＴＩＭＵＬＡＴＩＮＧＥＦＦＥＣＴＯＦＬＯＷＤＯＳＥ~（１４７）ＰｍＯＮＤＮＡＲＥＰＡＩＲＩＮＳＰＥＲＭＩＯＧＥＮＩＣＳＴ...     

用于轻水堆扩散计算的格林函数节块展开法

提出一种用于轻水堆多维扩散计算的新方法─—格林函数节块展开法（ＧＮＥＭ），它是对节块展开法（ＮＥＭ）和节快格林函数方法（ＮＧＦＭ）的改进。参照ＮＥＭ把节块内偏中于通量用高阶多项式展开，利用格林函数求出节块表面偏中子通量与中子流的耦合关系，并用净中子流作为中间变量以简化计算。根据提出的理论编制了二维计算程序ＧＮＥＭ，对ＬＷＲ基准问题的数值计算表明，ＧＮＥＭ的计算精度与ＮＧＦＭ相当，而计算速度较ＮＧＦＭ和ＮＥＭ分别提高了１倍与１／３倍。应用ＧＮＥＭ取代ＰＳＵＩ－ＬＥＯＰＡＲＤ／ＡＤＭＡＲＣ中的扩散程序，对三里岛核电站（ＴＭＩ－１）的第１、第６循环进行了燃耗计算，其计算速度提高了３倍多，且具有更高的精度。     

ACCURACY OF MEASUREMENT OF NATURAL GAMMA RAY SPECTRA BY HD－8004 NaI（T1）GAMMA SPECTROMETER

ＡＣＣＵＲＡＣＹ　ＯＦ　ＭＥＡＳＵＲＥＭＥＮＴ　ＯＦ　ＮＡＴＵＲＡＬ　ＧＡＭＭＡ　ＲＡＹ　ＳＰＥＣＴＲＡ　ＢＹ　ＨＤ－８００４　ＮａＩ（Ｔ１）ＧＡＭＭＡ　ＳＰＥＣＴＲＯＭＥＴＥＲＺｈｕＧｕｏｑｉｎ（朱国钦）ａｎｄＺｈｅｎｇＲｅｎｓｈｕ（郑仁淑）（Ｄｅ...     

SGEMP解析模型及其在模拟试验装置设计中的应用

介绍了一种ＳＧＥＭＰ解析计算模型并与数值模拟结果进行了比用,用该模型研究了与ＳＧＥＭＰ模拟试验真空腔体有关的试验精度问题,得到了受试样品尺寸与真空腔体尺寸比对模拟试验精度的变化关系,给出了模拟试验装置的设计要求。     

脑SPECT在癫痫儿童中的应用

对１５例儿童癫痫进行发作间期ＳＰＥＣＴ脑局部血流显像，部分患者同时进行了ＥＥＧ、ＣＴ、ＭＲＩ检查。结果显示ＳＰＥＣＴ阳性率最高，ＥＥＧ次之，ＣＴ、ＭＲＩ检出率的低于前二者，表明ＳＰＥＣＴ脑血流显像是诊断儿童癫痫灶的有效方法，且对癫痫儿童的预后，局部脑血流变化与临床表现的演变之间关系等研究有帮助。     

A PHOTOEMISSIVE MONOENERGETIC ELECTRON SOURCE FOR CALIBRATING THE BETA－MAGNETIC SPECTROMETER

ＡＰＨＯＴＯＥＭＩＳＳＩＶＥＭＯＮＯＥＮＥＲＧＥＴＩＣＥＬＥＣＴＲＯＮＳＯＵＲＣＥＦＯＲＣＡＬＩＢＲＡＴＩＮＧＴＨＥＢＥＴＡ－ＭＡＧＮＥＴＩＣＳＰＥＣＴＲＯＭＥＴＥＲ￥ＣｈｅｎＺｈｉｃａｉ（陈志才）；ＳｕｎＨａｎｃｈｅｎｇ（孙汉城）ａｎｄＭａｏＹａｊ...     

GASP—在束γ装置

本文介绍了一套大型在束γ谱仪－ＧＡＳＰ，它属于意大利国家核科学院（ＬＮＦＮ）ＬＮＬ实验室。谱仪主要包括：４０个带ＢＧＯ康普顿抑制器的ＨＰＧｅ探测器，８０个ＢＧＯ滤波器探测器以及４０个△Ｅ和４０个Ｅ带电粒子探测器。ＧＡＳＰ还可与一台该实验室现有的反冲质量谱仪ＣＡＭＥＬ进行符合测量实验。在当时，这是世界上最先进的一套原子核结构研究的实验设备。     

A COMPLEX-TYPE FOCUSSED MAGNETRON FOR SPUTTERING

ＡＣＯＭＰＬＥＸ－ＴＹＰＥＦＯＣＵＳＳＥＤＭＡＧＮＥＴＲＯＮＦＯＲＳＰＵＴＴＥＲＩＮＧ￥ＺｈｅｎｇＳｉｘｉａｏ（郑思孝）（ＩｎｓｔｉｔｕｔｅｏｆＮｕｃｌｅａｒＳｃｉｅｎｃｅａｎｄＴｅｃｈｎｏｌｏｇｙ,ＳｉｃｈｕａｎＵｎｉｖｅｒｓｉｔｙ,Ｃｈｅｎｇｄｕ...     

^153Sm—骨膦（Cl2MDP）的制备和初步动物实验

研究了＾１５３Ｓｍ－Ｃｌ２ＭＤＰ的制备和体外稳定性，对其在动物体内分布和血液清除进行评价，并与＾１５３Ｓｍ－ＥＤＴＭＰ进行比较，实验结果表明＾１５３Ｓｍ－Ｃｌ２ＭＤＰ具有良好的体外稳定性，骨中摄取量高，血液清除较快；与＾１５３Ｓｍ－ＥＤＴＭＰ比较，血液清除慢，但肝脏摄取量比＾１５３Ｓｍ－ＥＤＴＭＰ高１０倍，故１５３Ｓｍ－Ｃｌ２ＭＤＰ不是一种理想的骨肿瘤治疗剂。     

圆柱模型在金属腔体内的系统电磁脉冲响应

研究了X射线在金属腔体内激发的系统电磁脉冲响应，给出了其中的电磁场幅度、波形和分布曲线。计算结果表明：X射线透射入系统后，8．4J／cm^2的注量在靠近试体表面和金属壳体表面附近被激励的电场高达10^6V／m量级，对部件形成相当的威胁，有必要对部件采取加固措施。     

低注量X射线中屏蔽电缆的系统电磁脉冲响应研究

介绍了在低注量X光条件下进行电缆的系统电磁脉冲实验研究的方法。将DPF低注量脉冲X光响应实验与实验室电流注入方法相结合,对典型实用电缆的系统电磁脉冲响应情况进行了实验研究,结果表明该方法对于电缆的研究是切实可行的,克服了由于缺乏高注量X光装置带来的困难。     

IEMP Cable Coupling Phenomenology in Small Enclosures

Experiments were performed to measure IEMP coupling to cables in small cavities for non-space-charge limited conditions. The experiments were designed to separate the magnetic field, electric field, and charge deposition coupling modes. Investigations were made of the effects of cavity pressure, cable bias potential, and cable type and termination. A theoretical model was developed which represents the various coupling modes by voltage and current sources in a lumped-parameter equivalent circuit. Theoretical predictions were compared to the experimental data. For the configurations investigated the predictions agree with the data to within the experimental uncertainty.     

基于脉冲功率装置的圆柱腔体系统电磁脉冲研究

通过在中国工程物理研究院流体物理研究所的脉冲功率装置上开展圆柱腔体X射线辐照实验,研究了腔体系统电磁脉冲（腔体SGEMP）效应。应用一种网拍天线进行了圆柱腔体中电场的测量。此外,通过时域有限差分（FDTD）和粒子模拟（PIC）的数值方法,进行了腔体内电磁场的计算。研究发现,腔体内的气体会显著降低电场强度,而电场强度也会随剂量率的增加而增加。     

RF antenna analysis with the ICANT code

The ICANT code computes self-consistently the surface current distribution on a 3D antenna model radiating in a plasma or vacuum and has been used to analyze the coupling properties of various antenna models. In this work it is used to assess near-fields generated by different versions of the TCABR (Tokamak Chauffage Alfvén wave heating experiment in Brazil) antenna as well as coupling properties of the TEXTOR tokamak in Forshungszentrum Jülich. Two different strap models planned for the TCABR antenna are shown to be practically equivalent in terms of maximum electric field. Textor coupling calculations are close to experimental values.     

800kV高压传输装置的电场数值计算

介绍了800kV高压传输装置的组成和结构安排；对在SF6绝缘气体环境中的电缆终端进行了电场数值计算，并对计算结果进行了分析；最后得出结论，电缆终端的场强设计是可靠的。     

Development of the bus joint for the ITER Central Solenoid

The terminations of the Central Solenoid (CS) modules are connected to the bus extensions by joints located outside the CS in the gap between the CS and torodial field (TF) assemblies. These joints have very strict space limitations. Low resistance is a common requirement for all ITER joints. In addition, the CS bus joints will experience and must be designed to withstand significant variation in the magnetic field of several tenths of a Tesla per second during initiation of plasma. The joint resistance is specified to be less than 4 nΩ.The joints also have to be soldered in the field and designed with the possibility to be installed and dismantled in order to allow cold testing in the cold test facility. We have developed coaxial joints that meet these requirements and have demonstrated the feasibility to fabricate and assemble them in the vertical configuration. We introduced a coupling cylinder with superconducting strands soldered to the surface of the cable that can be installed in the ITER assembly hall and at the cold test facility. This cylinder serves as a transition area between the CS module and the bus extension.We made two racetrack samples and tested four bus joints in our Joint Test Apparatus. Resistance of the bus joints was measured by a decay method and by a microvoltmeter; the value of the current was measured by the Hall probes. This measurement method was verified in the previous tests. The resistance of the joints varied insignificantly from 1.5 to 2 nΩ.One of the challenges associated with a soldered joint is the inability to use corrosive chemicals that are difficult to clean. This paper describes our development work on cable preparation, chrome removal, compaction, soldering, and final assembly and presents the test results.     

二维电场积分方程时域矩量求解方法研究

对电磁场问题中广泛使用的电场积分方程进行了分析,把求解一维电场积分方程的时域矩量求解方法推广到二维,得到了可用计算的公式,最后给出了用此方法求解某表面电场模型的场值。     

2×6 MV串列加速器头部附近电场设计优化

为了给2×6 MV串列加速器提供高压电极与均压环尺寸，根据设计要求及已有参数，采用电磁场仿真软件计算了串列加速器的二维电场强度分布，针对高压电极结构、均压环截面形状及环间距等因素对串列加速器电场强度分布的影响提出了优化措施。仿真结果表明：直筒结构的高压电极与均压环接壤处电场强度分布不均匀，而圆弧过渡结构的高压电极具有屏蔽作用，比直筒时电场强度分布更均匀；优化均压环截面形状与减小环间距可降低环间电场畸变，但后者对减小均压环表面的电场贡献更大。最终优化后得到高压电极与均压环的尺寸可满足新研制的串列加速器要求。