核孔膜研究装置中的电子学线路

本文提出了一个核孔膜研究实验装置，并重点介绍了它们为该实验装置设计研制的电子学线路。     

电力变压器的变比、分接头位置及调压方式的正确选择和需进行的必要验算

本文较详细地介绍了电气专业设计中正确选择电力变压器的变比、分接头位置及调压方式等应注意的问题。同时提出，应对有关的高压输电线路、电力变压器和低压配电线路的最大与最小电压损失进行必要的验算．     

基于噪声分析方法的微电流快响应放大器

介绍了基于噪声分析方法，测量ADS次临界反应堆动态参数的微电流快响应放大器设计原理、线路及测试结果。     

切尔诺贝利核电站2号机组火灾事故

对１９９１年切尔诺贝利２号核电机组汽轮机厂房火灾原因的调查分析发现，发电机气动隔离断路器故障是由控制线路的短路引起的。很明显该线路早在１９７７年建造期间已经损坏。另外，发电机输出端上没有备用隔离断路器也是发生该事故的原因之一。最近的ＲＢＭＫ设计，如切尔诺贝利３号机组，具有这种部件。     

DYS—92型低本底液体闪烁谱仪

ＤＹＳ－９２型低本底液体闪烁谱仪是ＤＹＳ系列低本底液体闪烁计数器换代产品，也是为满足测量极低含量的氚和碳－１４环境样品而特殊设计的，该仪器还可能测量氪－８５，氯－３６等其它环境放射性同位素以及示踪放射性同位素。ＤＹＳ－９２由主机内的Ｚ８０主板和２８６以上的ＰＣ微机控制运行，采用了新设计的电子学线路，并将线路与主机安装在一起仅微机在外，软件有：测量运行程序，数据处理程序和能谱分析程序三大部分，在ＤＹ     

扫描控制单元电子学线路

简要介绍了一种新的扫描控制单元电子学线路，它是为高电离态原子光谱学实验研究装置控制及数据获取电子学系统专门设计研制的，是该系统的关键电路之一。     

对卫星抗辐射加固保证大纲的探讨

大纲提出我国卫星工程抗辐射加固设计技术要求及考核内容。对极轨卫星的空间辐射环境提出了极轨卫星抗辐射加固设计根据。对总体抗辐射加固设计、单机抗辐射加固要求及考核、线路抗辐射加固设计要求（包括软、硬件要求）、元器件选择和考核以及抗充放电设计要求和考核作了初步规定，为卫星工程近期抗辐射加固提出具体的框架。     

压水堆核电厂过冷度显示的仿真

清华大学核电厂模拟培训中心模拟机的参考电厂是美国本屋公司设计的其模型中没有堆芯过冷度显示系统的模拟。根据三哩岛事故的教训，在该装置上增设过冷度显示的模拟是十分必要的。本文叙述了在原模拟机上增设过冷度显示所进行的软件设计、数据传输和显示线路设计。     

铁氧体定向耦合器及其在加速器高频控制中的应用

设计了一种６ＭＨｚ、３ｄＢ铁氧体定向耦合器，并用于制作加速器高频系统的控制单元。此种定向耦合器是用紧密绞合的双股漆包线绕在射频铁氧体磁环或磁芯上做成，具有尺寸小、结构简单和频带宽等优点，工作范围一般在几个ＭＨｚ到几十个ＭＨｚ。在此基础上设计制作了鉴相器、反设式电调移相器、电调衰减器和ＡＬＣ等线路，使加速器高频谐振腔实现了自动调谐。     

脉冲数目分析器

利用双稳定电路的特性设计成分析脉冲数目的电子学线路,并在实际应用中获得良好的结果。     

Preparation of Zn/TiO2 powder and its photocatalytic performance for oxidation of P-nitrophenol

Zn-doped TiO2 catalysts were prepared using a sol-gel method and characterized by XPS,UV-Vis, BET, XRD in this study. Under the irradiation of simulant sunlight, the photocatalytic activity for the degradation of p-nitrophenol was studied too. After irradiation for 2.5 h, the degradation percentage of p-nitrophenol could rise to more than 80 %. The results showed that the spectrum absorption band edge of Zn/TiO2 powder does not broaden obviously comparing with pure TiO2 powder. Zinc exists as Zn （11）. When calcined at 973 K, there is a new phase as ZnTiO3 in Zn/TiO2 catalyst. The order of photocatalytic activity of Zn/TiO2 catalysts calcined at different temperatures for p-nitrophenol is 773 K 〉 673 K 〉 873 K 〉 573 K 〉 973 K and the photocatalytic activity of Zn/TiO2 catalyst calcined at 773 K is better than TiO2 catalysts heated at the same temperature, and outclasses that of commercial TiO2 catalyst. It also showed that the photocatalytic degradation of p-nitrophenol follows first-order kinetics under the irradiation of simulant sunlight.     

Current status of radiation therapy for prostate cancer

Radiotherapy for the treatment of prostate cancer has been extensively explored in the past. Along with the comprehensive understanding of the biology of prostate cancer and rapid advances in terms of technology, the out- come of treatment for the patients with prostate cancer has improved. The authors review radiotherapy as the primary treatment for the disease, with particular emphasis on the technological advances from both the radiobiological and radiophysics aspects. Nonconventional fractionated irradiation like hyper- or hypo-fractionation has been imple- mented in the clinic, the final results still need to be confirmed in the future. Technological advances like IMRT, IGRT, in the last two decades have significantly improved the delivery of external radiotherapy to the prostate. This has re- sulted in an overall increase in the total dose that can be safely delivered to the prostate, which has led to modest im- provements in the biochemical outcome. However, establishing the standard therapy for prostate cancer remains con- troversial. It is hoped that the next decades will bring continued advances in the development of biologicals that will further improve current clinical outcomes.     

The control system for SSRF injection and extraction

This paper introduces the injection and extraction control system design for SSRF,which is a distributed control system aimed at stability and reliability of the pulse power supplies,PPS(Personnel Protection System)and MPS(Machine Protection System).The hardware environment is mainly based on PLC(Programmable Logic Con- troller),and ARM(Advanced RISC Machine)is also applied for studying stability of the power supplies.WinCC and EPICS(Experimental Physics and Industrial Control System)have been selected as the platforms of SCADA(Super- visory Control and Data Acquisition).For unifying the interfacing to the control computer,all front-end equipments are connected via Industrial Ethemet.     

水平管内含空气蒸汽强制对流冷凝换热模型研究

为研究含空气蒸汽在水平管内强制对流冷凝换热特性,基于对传热传质过程的分析,建立了管内为环状流与波状流条件下的流动冷凝换热模型。从潜热、显热和液膜3个环节对整个换热过程进行建模,最终得到计算局部冷凝换热系数的理论关系式。模型预测结果与实验数据的对比表明,二者相对偏差在±20%以内,验证了该换热模型的准确性与适用性。通过进一步的研究发现：从换热管入口至出口,随着冷凝的进行,管内换热主要热阻由液膜热阻向气液界面的凝结热阻转变;主流气体对流换热过程基本可忽略。     

有效探测面积大于1000 cm2的正比计数器测量系统性能测试

为对自制的活性面积高达1 000 cm²的大面积源进行表面发射率定值,同时作为现有2πα、2πβ表面发射率标准装置能力的扩充,研制了一套内置式大面积2π多丝正比计数器测量系统,并利用活性区直径为8 mm的²⁴¹Am点源及活性区面积为10 cm×15 cm的大面积²⁴¹Am和⁹⁰Sr-⁹⁰Y源对其进行计量学性能测试。结果表明：计数器内计数响应均匀性优于±0.4%,有效探测面积达1 400 cm²;所得²⁴¹Am源高压坪曲线的坪长为1 400 V,坪斜为0.27%/100 V,坪区内计数变化为0.87%;⁹⁰Sr-⁹⁰Y源高压坪曲线的坪长为300 V,坪斜为0.75%/100 V,坪区内计数变化为0.80%;10次测量重复性好于0.4%,8 h内短期稳定性好于0.3%,1 a内长期稳定性好于0.8%。     

Investigations on landmine detection by BF3 detector

Experiments were carried out to investigate the possible use of neutron backscattering for the detection of polyethylene (PE) sample buried in the soil. In detection of landmine by neutrons, the neutron detector and its shield play an important role. In this paper, the effects of graphite, heavy water, polyethylene and boric acid moderators on the flux of back scattered neutrons were investigated. We have also experimentally verified the effect of BF3 detector shield and obtained good agreement with theory.     

Web Services interface of SSRF archive data analysis system

Accelerator database stores various static parameters and real-time data of accelerator. SSRF (Shanghai Synchrotron Radiation Facility) adopts relational database to save the data. We developed a data retrieval system based on XML Web Services for accessing the archive data. It includes a bottom layer interface and an interface applicable for accelerator physics. Client samples exemplifying how to consume the interface are given. The users can browse, retrieve and plot data by the client samples. Also, we give a method to test its stability. The test result and performance are described.     

Assessment of radioactivity levels in some oil samples from the western desert, Egypt

Distributions of natural gamma-emitting radionuclides were determined in 93 oil samples collected from some petroleum fields in the western desert of Egypt. The radioisotope activities in the area under investigation lay in the range of (21 ± 4) to (38 ± 13) Bq?L-1 for 226Ra, (9 ± 2) to (15 ± 5) Bq?L-1 for 232Th, and (154 ± 28) to (303 ± 54) Bq?L-1 for 40K. The mean values were 27, 12, and 201 Bq?L-1, respectively. Among oils, variations in radionuclide ac- tivities could be on account of differences in TDS, HCO3, and Ba, with high or low pH. In this environment, oil prop- erties differently affected the mobilization of natural radionuclides. The range of 226Ra variation had been compared with available data from other countries. The calculated absorbed dose rate ranged from 22.33 to 32.66 nGy?h-1 in lo- cation (B) and (E) respectively, which was less than the accepted value.     

Preparation and properties of 117m Sn(IV)-TTHMP in in-vitro and in small animals

In this work,TTHMP was synthesized and labelled with 117m Sn.The preparation conditions,stability and lipophilicity of 117m Sn(IV)-TTHMP were investigated.Biodistribution of the complex in rabbits and mice was studied.It was found that the quantity of TTHMP and pH value of the prepararion solution had vital effects on the labeling yield of 117m Sn(IV)-TTHMP.It was also found that 117m Sn(IV)-TTHMP was hydrophilic and stable at room temperature and 37℃ in open air 117m Sn(IV)-TTHMP showed unexpectedly high bone uptake and bone-to-blood ratio in the animals.This made it potentially useful as an reagent for skeletal scintigraphy and radiotherapy of bone tumors.     

Interaction between uranium and humic acid (Ⅰ): Adsorption behaviors of U(Ⅵ) in soil humic acids

The adsorption behaviors of uranium on three soil humic acids (HAs), which were extracted from soils of different depths at the same site, were investigated under various experimental conditions. The adsorption results showed that U(Ⅵ) in solutions can be adsorbed by the three soil HAs, with the order of FHA (HA from 5 m depth of soil) ＞SHA (HA from the surface) ＞THA (HA from 10 m depth of soil) for adsorption efficiency in each desirable condition, and the adsorption reached equilibrium in about 240 min. Although the maximum adsorption efficiency was adsorption could be described with Langmiur isotherm or Freundlich isotherm equation. The L/S (liquid/solid, mL/g)ratio and pH were important factors influencing the adsorption in our adsorption system besides uranium concentration. The adsorption efficiency decreased with the increase of the L/S ratio and pH at the pH range of 2.0-3.0 for SHA and THA or 2.5 - 6.0 for FHA. However, no significant difference in adsorption of U(Ⅵ) was observed at the experimental temperature. All the results implied that humic substances have different characteristics in samples even collected at the same site.