最新刊期
      卷 0 ， 期 0 ， 2020
      • LI Hui1,2 WANG Tailing3 WANG Xueyan1 ZHAO Tao1 HU Chunhong1 LU Weiyuan1 WANG Baoen4 ZHAO Xinyan4 ZHU Peiping5 HUANG Wanxia5 YUAN Qingxi5 WANG Junyue5 LUO Shuqian1 1
        Issue 2, (2008)
        摘要：In this paper, imaging investigation of hepatic fibrosis in rats induced by human albumin with hard X-ray diffraction enhanced imaging (DEI) is reported. The experiments were performed at 4W1A beamline of Beijing Syn- chrotron Radiation Facility (BSRF). The results show that great differences can be observed in DEI images between the normal and diseased rats in different stages of liver fibrosis. The difference can also be revealed by the profile curve and texture measurements on regions of interest. The results show that DEI may be a potential way for diagno- sis of hepatic fibrosis.  
        关键词：Synchrotron radiation;Hepatic fibrosis;X-ray diffraction enhanced imaging;Histological image;Tex-ture measurements   
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        发布时间：2021-03-12
      • ZHAO Liying YIN Chongxian LIU Dekang
        Issue 2, (2008)
        摘要：A test platform for measuring temperature drift of SSRF timing system has been developed. The hardware and software algorithm of the platform are described in detail in this paper. It is featured by fewer hardware, clear software algorithm, high sensitivity and wide applications for either SSRF systems or other systems with similar temperature drift requirement. Finally, the curve and conclusion of SSRF timing system temperature drift was given.  
        关键词：Temperature drift;Phase delay;Software algorithm;General-purpose interface bus;Timing system   
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        发布时间：2021-03-12
      • XIE Bo WANG Heyi WENG Kuiping
        Issue 2, (2008)
        摘要：Static corrosion behaviour of 316L stainless steel in liquid LiPb alloy has been studied by hang-flake method and corrosion weight loss and metal-phase analysis. The results show that main reason of materials corrosion is dissolution and quality-migration of elemental composition in liquid LiPb alloy, and the most important factor of influence corrosion behaviour is temperature and oxygen composition in the alloy or othe materials.  
        关键词：316L stainless steel;Liquid LiPb alloy;Corrosion;Structural material   
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        发布时间：2021-03-12
      • WANG Jinhui1 LIANG Hua2 MING Jianchuan1 GUO Qiqian1 DING Jia1 XU Zhiqian1 JIN Jie1 ZHU Qiliang1 BAI Yulan1 1
        Issue 2, (2008)
        摘要：In order to extend service life of the main shaft bearing of turbine engines, GCr15 and M50 steel samples and bearings were implanted with 100 keV N and Ti ions. Properties of the implanted samples were determined. The results show that the friction coefficient, wear resistance, corrosion resistance and fatigue resistance are enormously improved by the N + Ti ions implantation. Implantation uniformity of the balls, rollers and rings of the bearing is over 87%. The implanted bearing has stood the proof by the production enterprise.  
        关键词：Ion implantation;Gas turbine engine;Main shaft bearings;Wear resistance;Corrosion resistance   
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        发布时间：2021-03-12
      • ZHU Danfeng1 DU Guangtian1 GUO Panlin1 ZHU Zhouxia1 ZHU Xikai1 FU Yunqing2 HU Wei2 ZOU Yaming2 1
        Issue 2, (2008)
        摘要：A modified miniature metal vapor vacuum arc ion source has been developed for the Shanghai electron beam ion trap. Several kinds of elements were tested to extract lowly charged ions, such as Fe, Au, Ge and Ti. In this paper, we describe the design and features of the MEVVA. And experiment results of Au ions injection demonstrate that the Au ions were successfully injected and trapped in the drift tubes.  
        关键词：MEVVA ion source;Electron beam ion traps;Ion injection   
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        发布时间：2021-03-12
      • LIU Hongbing TAO Jie ZHANG Pingze CHANG Hua
        Issue 2, (2008)
        摘要：The functionality and reliability of coated devices are strongly affected by residual stresses of coatings. The distributions of the residual stresses in Al/316L functionally gradient coatings after the fabrication were simulated by means of finite element analysis in order to prevent spallation and to improve the thermo-mechanical behaviour of the tritium penetration barrier. The effect of compositional exponent, the coatings thickness and the number of graded layers on the residual stresses were discussed. The results showed that the compositional gradient of the coating had an obvious influence not only on the residual stress magnitude at the interface between the coating and the substrate, but also on the location of the stress peak. The residual stresses on the coating surface and at the coating/substrate in- terface decreased with an increased coatings thickness, and decreased with the increasing in the number of graded layers until it reach 9.  
        关键词：Functionally gradient material;Finite element analysis;Residual stress;Coatings   
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        发布时间：2021-03-12
      • MA Shengge1 YU Dayang2 YANG Hongwei1 ZHANG Yichen2 1
        Issue 2, (2008)
        摘要：Cr+Ti+TiNC/TiNC+C/DLC films were prepared by combining unbalanced magnetron sputtering with cathode arc and Hall ion source. The films, with smooth surface, are deep black in color. In order to improve adhesive property of the DLC films to the substrate, graded interlayers, Cr+Ti+TiNC and TiNC+C have been used. The multi- layer film shows good mechanics properties.  
        关键词：Diamond-like carbon film;Multilayer films;Unbalanced magnetron sputtering;Cathode arc;X-ray Photoelectron Spectroscopy   
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        发布时间：2021-03-12
      • WANG Shilian1 CHANG Yongfu2 FAN Jinlong2 BAI Tao2 LU Jiachun2 SHI Quanlin2 LI Qi2 ZHANG Xiaolin2 LI Qi1 CHANG Yinzhong1 1
        Issue 2, (2008)
        摘要：142La is an important radionuclide to determine the burn-up of nuclear fuel, but its half-life differs mark- edly in references. With mass relay method by well type high purity germanium detector and continuous trace method by coaxial high purity germanium detector, we determined that the half-life of 142La is (90.78±0.16) min.  
        关键词：142La;Half-life;Mass relay;Continuous trace   
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        发布时间：2021-03-12
      • LI Guihua1,2 QIAO Weimin1 JING Lan1 1
        Issue 2, (2008)
        摘要：High precision simple interpolation asynchronous FIFO of HIRFL-CSRe was developed based on the ACEX1K30 FPGA in VHDL Hardware Description language. The FIFO runs in FPGA of DSP module of HIRFL-CSRe. The input data of FIFO is from DSP data bus and the output data is to DAC data bus. It’s kernel adopts double buffer ping-pong mode and it can implement simple interpolation inside FPGA. The module can control out- put data time delay in 40 ns. The experimental results indicate that this module is practical and accurate to HIRFL-CSRe.  
        关键词：ACEX1K30;Asynchronous FIFO;Double buffer ping-pong mode   
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        发布时间：2021-03-12
      • XUE Yuxiong1 CAO Zhou1 YANG Shiyu1 TIAN Kai1 GUO Gang2 LIU Jiancheng2 1
        Issue 2, (2008)
        摘要：There are accelerator simulation source(heavy ion, proton), pulsed laser simulation source and californium -252 simulation source to single-event effects testing on the ground. It describes equivalent of single event effect (SEE)simulation source to use three different simulation source(pulsed laser, heavy ion and californium -252)simulating IDT6116 SRAM SEE sensitivity experiment. The experimental data have been compared for three different simulation source, the results show that the experimental conclusion of single event effect are consistent with.  
        关键词：Single-event effect;Simulation source;Pulsed laser;Heavy ion;Californium-252   
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        发布时间：2021-03-12
      • XIONG Guangsu WU Shuming XU Xiaojing ZHOU Jun ZHU Hongyin LI Enling MO Jianzhong
        Issue 2, (2008)
        摘要：This work is to investigate expression changes of APE/Ref-1 in human pancreatic cancer cells irradiated with colloid of chromic 32P phosphate (32P-CP). Human pancreatic cancer cell line of Patu-8988 was irradiated with 0 0.11, 0.22, 0.45 or 0.90 MBq/mL of 32P-CP for 24 h. The mRNA and protein levels of APE/Ref-1 were determined by RT-PCR and Western-blot respective. The results show that the expression of APE/Ref-1, both of mRNA and protein levels were elevated significantly and were positively related to the irradiation dose. These suggested that elevated APE/Ref-1 expression might be an adaptive response contributing to the overall radioresistance seen in pancreatic carcinomas and implied the potential theraputic effects of gene silence targeted to APE/Ref-1.  
        关键词：Pancreatic neoplasms;APE/Ref-1;Colloid of chromic 32P phosphate   
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        发布时间：2021-03-12
      • FANG Wei1 JI Shundong2 WANG Feng3 WANG Feng1 RUAN Changgeng2 WANG Zizheng3 1
        Issue 2, (2008)
        摘要：99Tcm labeled C2A domain of synaptotagmin I (99Tcm-Syt I-C2A) is a scintigraphic tracer that binds to phosphatidylserine exposed on activated platelets. This study is to determine the potential of this agent for imaging acute venous thrombosis. A stainless steel was placed in femoral vein for inducing venous thrombi in 5 dogs, which were injected each with 185 MBq of 99Tcm-Syt I-C2A. Images of legs were acquired at 1, 2 and 3 h after injection. ROI analysis was applied to measure the thrombus-to-contralateral location and thrombus-to-background ratios. The samples of thrombus, blood, and muscle were separated and were counted in a γ well counter for percent injected dose %ID·g-1. Thrombus-to-blood and thrombus-to-muscle ratios were calculated from the %ID·g-1 value. In in vivo imag- ing, the thrombus-to- contralateral location ratios were 3.01±0.30, 3.22±0.21 and 3.37±0.57, respectively, and throm- bus-to-background ratios were 3.10±0.39, 3.32±0.31 and 3.50±0.45, respectively, at 1, 2 and 3 h after injection. The thrombus-to-blood and thrombus-to-muscle ratios of %ID·g-1 were 2.40±0.35 and 68.90±45.30, respectively. 99Tcm-Syt I- C2A with high venous thrombus uptake is a promising agent for imaging acute venous thrombosis.  
        关键词：Thrombosis;Radionuclide imaging;Synaptotagmin I;Platelets   
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        发布时间：2021-03-12
      • WANG Tongli CHEN Jie LEI Shengxue WANG Changsheng
        Issue 2, (2008)
        摘要：Portable field NaI(Tl) γ-ray spectrometer is an important tool for determining potassium, uranium and thorium contents in sediments. The results depend on accuracy of the calibration and the extent to which the measur- ing conditions resemble those adopted during calibration. e.g. geometry, background radiation, components and den- sities of materials, etc. Calibration of a field ORTEC MicroNomad NaI(Tl) γ-ray spectrometer, in auger hole geome- try was done using the Oxford calibration blocks with known contents of radioisotopes of K, U and Th. A granite block similar to Heidelberg’s calibration block was set up at SKLED. It can be used as a calibration block to check the γ-ray spectrometer. Contents of K, U and Th of the granite block were analyzed using different methods.  
        关键词：Environmental dose rate;Portable NaI(Tl) γ-ray spectrometry;Calibration   
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        发布时间：2021-03-12
      • ZHANG Zhongbing OUYANG Xiaoping WANG Lan LI Chunhua MA Yanliang
        Issue 2, (2008)
        摘要：The equivalent circuit of the ICI detector has been established in this paper. The rise time of the ICI detector is 0.59 ns, which is calculated with the distributed parameters. The experiment for measuring the time response of the ICI detector is carried out on the multi-purpose radiant source. The time response obtained by the experiment is (0.677±0.144) ns, which agrees well with the calculation result. It is shown that the ICI detector has sub-nanosecond time response property and can be used to measure the rapidly changing pulsed gamma-ray flux.  
        关键词：Detector;Time response;Gamma-ray;Pulsed radiation detection   
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        发布时间：2021-03-12
      • WEI Shouqi MO Jinhai HE Shaojia
        Issue 2, (2008)
        摘要：The working principle and operation characteristics of a high-voltage PWM-BUCK DC/DC converter are discussed in this paper, and a practical engineering technical route is proposed to apply the converter to high power accelerating voltage source of electron beam bombarding furnace. Compared with the traditional thyristor phase-shifted high voltage source, the application results show that the suggested power supply has the advantages of lower current harmonic, higher power factor and higher operation efficiency.  
        关键词：Electron beam bombarding furnace;High-voltage PWM converter;Tetrode;Harmonic current;High-voltage filter circuit   
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        发布时间：2021-03-12
      • LIU Guangya1,2 LING Qiu1 1
        Issue 2, (2008)
        摘要：This paper gives a review development of air independent propulsion (AIP) system for submarine appli- cations. The principles, configuration and suitable reactor-type about small nuclear power AIP are presented and per- formance status of the submarines equipped with small nuclear power AIP is given.  
        关键词：Conventional submarine;Nuclear submarine;Small nuclear power;Air independent propulsion   
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        发布时间：2021-03-12
      • HU Chunming TANG Fengping ZHENG Zhou LIU Xiankun
        Issue 2, (2008)
        摘要：The safety in a cold neutron source (CNS) includes nuclear safety, radiation safety and hydrogen safety, with the latter being the most comprehensive. In general, the safety design of defence in depth implies defence levels and multiple physical barriers on the hydrogen system of CNS, in order to minimize the possibility of formation of a hydrogen-oxygen mixture. The implementation of the safety concept of defence in depth in a CNS under construction is presented, and it implies the design can ensure the hydrogen safety in the CNS.  
        关键词：Cold neutron source;Hydrogen safety;Defense in depth for safety;Multiple barriers   
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        发布时间：2021-03-12
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