最新刊期
      卷 0 ， 期 0 ， 2020
      • Kurash Ibrahim1 WU Ziyu1 QIAN Haijie1 ZHANG Jing1 Abbas M I1 CHEN Zhigang1,2 SU Run1 LIU Fengqin1 1
        Issue 2, (2003)
        摘要：With a sustained and steady operation of the photoemission station at Beijing Synchrotron Radiation Fa-cility, users from different research fields have carried out their investigation on the electronic structure of metal sur-face-interface, metal doped fullerene as well as colossal magneto-resistance materials utilizing different experimental modes provided by the photoemission station. In this paper we would present some representative experimental results obtained on the station.  
        关键词：Synchrotron radiation;Photoemission spectroscopy   
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        发布时间：2021-03-12
      • SHEN Guobao1,2 LENG Yongbin2 ZHENG Lifang2 LU Chengmeng2 LIU Songqiang2 1
        Issue 2, (2003)
        摘要：This paper describes the design and implementation of an arbitrarily function generator (AFG), which will be used in the control system of Shanghai Synchrotron Radiation Facility. The AFG is constructed with COTS hard-ware modules and vxWorks real-time operating system and works under EPICS software environment. The AFG can be used to ramp booster抯 energy for power supply system, and to control the radio frequency system as well.  
        关键词：EPICS;Ramping;Arbitrarily function generator   
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        发布时间：2021-03-12
      • WANG Lin FAN Kuanjun SHANG Lei XU Hongliang WANG Xiangqi
        Issue 2, (2003)
        摘要：The process of designing and computing the pulse field of kicker magnet with ferrite cores for new injection system of HLS storage ring is presented. Firstly, the requirement of field quality is derived from tracking study of injection course. Then, the generation of pulse field is qualitatively analyzed and numerically calculated and the effects of eddy currents in core on magnetic field homogeneity are discussed under different conditions. According to the results of the calculation and the requirement for field quality, the parameters of kicker magnet are determined.  
        关键词：Bump orbit;Kicker magnet;Pulsed magnetic field;Eddy effects   
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        发布时间：2021-03-12
      • JIN Ge YU Xiaoqi WAN Changchun LU Jingping
        Issue 2, (2003)
        摘要：A calibration system for the photoconductive detector based on gated integration method is introduced. This measurement method was developed at the soft X-ray of Beijing Synchrotron Radiation Facility (BSRF) source. The results of measurement are reported in this paper.  
        关键词：Photoconductive detector;Gated integration;Calibration system   
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        发布时间：2021-03-12
      • KANG Shixiu1 SHEN Xiansheng2 WU Ziqin1 ZHOU Zhongze3 JU Xin4 HUANG Yuying4 1
        Issue 2, (2003)
        摘要：The leaves of submerged plant Ceratophyllum demersum, gathered from 10 different regions in the middle part of the Huai River, were analyzed by SR XRF. We found that there are more than 20 heavy metal elements in the XRF spectra. They are mainly Mn, Fe, Co, Ni, Cu, Zn, Rb, Sr and Zr. C. demersum has shown good capability of concentrating heavy metal elements Mn, Fe and Zn, and excellent ability of protecting super-nutrition contamination. It was also shown that C. demersum from the Ying River of Yingshang county,the Hongze Lake and the reservoir of copper mine in Chuzhou city of Anhui Province, respectively, enriched more heavy elements than that from other places.  
        关键词：Huai River;Ceratophyllum demersum;X-ray fluorescence;Heavy metal   
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        发布时间：2021-03-12
      • XU Diandou ZHONG Weike ZHANG Zhaohui CHAI Zhifang
        Issue 2, (2003)
          
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        发布时间：2021-03-12
      • ZHAO Weijiang YAN Sha LE Xiaoyun XIANG Wei HAN Baoxi WANG Yugang XUE Jianming
        Issue 2, (2003)
        摘要：The surface modification of materials induced by intense pulsed ion beam is a new ion beam technology for surface modification of materials. To develop this new technology, we have started a series of basic studies on intense pulsed energy effects, thermoldynamic process and crater phenomena on the metallic surface irradiated by intense pulsed ion beams and construction of planar magnetically insulated diode to get homogenous intense pulsed ion beam with a large beam size. It has been demostrated that, for intense pulsed ion beams, excepting ion doping effects, the thermoldynamic effects induced by the energy deposition are more promising as a powerful tool for the surface modification of materials, since there could be the 搒uper-range effects?and the high availability of ion dose and energy. In this paper, the progress of fundamental studies on above items in our lab is reviewed.  
        关键词：Intense pulsed ion beam;Surface modification of materials;Pulsed energy deposition;Ion beam thermal treatment   
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        发布时间：2021-03-12
      • YU Shiji1 MA Tengcai2 1
        Issue 2, (2003)
        摘要：Chemical vapor deposition of the hard diamond-like carbon (DLC) films was achieved using an inductively coupled plasma source (ICPS). The microscopy, microhardness, deposition rate and structure characteristic of the DLC films were analyzed. It is shown that the ICPS is suitable for the hard DLC film deposition at relatively low substrate negative bias voltage, and the substrate negative bias voltage greatly affects chemical vapor deposition of the DLC film and its quality.  
        关键词：Inductively coupled plasma source;Diamond-like carbon film;Substrate negative bias voltage   
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        发布时间：2021-03-12
      • LU Ting WANG Xinfu ZHOU Hongyu ZHU Guanghua DING Xiaoji
        Issue 2, (2003)
        摘要：Positron lifetime measurements were performed on biological samples of lima bean and peanut. The ex-perimental results show that there are many small holes with diameter of 0.48nm and 0.7nm, respectively, in lima bean and peanut. The very special micro-hole structure of plant seeds is the basis of biological effect caused by ion implan-tation with low energy. The peanut seeds were implanted with vanadium ions at energy of 200keV. The positron anni-hilation lifetime (PAL) spectra for the implanted and non-implanted peanut samples were compared.  
        关键词：Positron annihilation;Plant seed;Biological effect;Ion implantation   
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        发布时间：2021-03-12
      • CHEN Panxun
        Issue 2, (2003)
        摘要：The enhanced damage was summarized for bipolar devices and bipolar linear circuits in the radiation environment of low dose rate. It could cause the early failure of systems. The physical mechanism of producing failure of low dose rate was analyzed. This is totally different from the damage mechanism of MOS devices caused by ionizing radiation. In order to shorten the time of simulating test and to raise the ratio of effectiveness/spending, several test methods of accelerating simulation were researched. Some points of view were put forward on system hardness assurance at low dose rate.  
        关键词：Low dose rate;Failure;Radiation damage;Simulating test   
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        发布时间：2021-03-12
      • YU Weizhong1 YUAN Jiaping1 SHEN Jingshu2 1
        Issue 2, (2003)
        摘要：The research on the copolymer SEBS was carried out. The SEBS films made by different types of solvent show different micro-phase structures. The differences of the size and the concentration of free volume defects be-tween them can be detected by positron annihilation technique.  
        关键词：Positron annihilation technique;Block copolymer SEBS;Micro-phase separate   
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        发布时间：2021-03-12
      • YAO Lianghua
        Issue 2, (2003)
        摘要：Supersonic molecular beam injection (SMBI), a new fuelling method, was first proposed and demonstrated on the HL-1 tokamak in 1992, and successfully developed and used in HL-1M (modified from HL-1) and HT-7 superconducting tokamak. The characteristics of the beam injection are electron density peaking and hollow profile of electron temperature. The increase of the rotation velocity of poloidal plasma flow results in the edge plasma disturbance eliminating and plasma energy confinement improvement. The fuelling efficiency of SMBI is increased to twice as much as that for gas puffing, whereas the particle retention on the surface is reduced. Recently new results of SMBI experiments were obtained by increasing the gas pressure, and the hydrogen clusters within the beam were found to play an important role in the deeper injection. It was also shown that injected particles could penetrate into the core region of the HL-1M plasma, which results in a stair-shaped electron density increment, just as the behavior of ice pellet injection. These results prove effectiveness of SMBI as a promising fuelling tool for stead-state operation of great-size tokamak or stellarator.  
        关键词：Tokamak;Supersonic molecular beam;Clusters;Plasma ++   
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        发布时间：2021-03-12
      • CHENG Xinli1 XU Yusheng2 XU Weixin3 JIN Huijuan3 1
        Issue 2, (2003)
        摘要：The amorphous Fe-Zr-B films prepared by DC magnetron sputtering have been studied using X-ray dif-fraction, XPS and Msbauer spectroscopy, and compared with amorphous ultrafine Fe-Zr-B powder prepared by chemical reduction. The XPS shows that surface of the film is oxidized partly, the interactions among Fe, Zr, B are strong in deeper part. The result of Msbauer spectroscopy shows that Zr and B atoms around Fe atoms cause the re-duction of hyperfine field at Fe nucleus and make the distribution of magnetic hyperfine field with two peaks. This implies that the amorphous Fe-Zr-B film consists of two amorphous microstructures.  
        关键词：Fe-Zr-B alloy;Amorphous film;DC magnetron sputtering;Msbauer Spectroscopy   
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        发布时间：2021-03-12
      • WANG Jinhua
        Issue 2, (2003)
        摘要：This paper reports the effects of several polyfunctional monomers on radiation vulcanization of ethylene-propylene rubber and ethylene-butylene rubber. Results show that triethyleneglycol dimethacrylate (TEGDMA) is the most efficient to radiation vulcanization of ethylene-propylene rubber. TEGDMA not only lowers the vulcanization dose (Dv), but also increases the tensile strength greatly. However, the effect of polyfunctional monomers on radiation vulcanization of ethylene-butylene rubber is less pronounced.  
        关键词：Ethylene-propylene rubber;Ethylene-butylene rubber;Radiation vulcanization;Electron beam;Polyfunctional monomer   
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        发布时间：2021-03-12
      • ZHANG Xiuli WANG Yongxian ZHANG Chunfu LI Junling YIN Duanzhi
        Issue 2, (2003)
        摘要：Synthesis of the carrier free 188Re-norfloxacin was investigated using 188Re eluted from a 188W/188Re gen-erator. Stannous chloride was used as the reducing agent for the reduction of the carrier free 188Re. Influences of concentration of reducing agent, pH, temperature and reaction time on the labelling yield of 188Re-norfloxacin were examined and the optimum conditions were obtained. Under the optimum conditions, the labelling yield of 188Re-norfloxacin was more than 92%. The stability of 188Re-norfloxacin at pH 4 was studied. Radiochemical purity of 188Re-norfloxacin was nearly constant in 24 hours.  
        关键词：Carrier free 188Re;Norfloxacin;Synthesis   
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        发布时间：2021-03-12
      • GENG Jianhua1 CHEN Yingmao2 TIAN Jiahe2 CHEN Shengzu1 1
        Issue 2, (2003)
        摘要：For the entire process of intervention tumor therapy through interstitial injection of -radionuclides, mathematical models were discussed in terms of absorbed dose distribution, dose effect relationship and tumor curability levels. The following mathematical formulae for the tumor therapy were recommended, which were based, respectively, on, 1) radiation dose rate distribution in tumor volume, 2)clonogenic cells survival fraction distribution in tumor and 3)tumor control probability. The mathematical formulae could be used as the basic theory in the tumor treatment planning for interstitial intervention with -radionuclides.  
        关键词：Beta radionuclide;Tumor therapy;Mathematical model   
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        发布时间：2021-03-12
      • JIANG Ximan ZHU Linfan LIU Xiaojing CAI Bei LI Wenbin YUAN Zhensheng YANG Tao XU Kezun
        Issue 2, (2003)
        摘要：An one-dimension position-sensitive multichannel detector is applied in our high-resolution fast electron energy loss spectrometer. The off-line data-processing methods for this spectrometer in the static and scanning detec-tion mode have been discussed systematically. A new data-processing method is proposed, through which we can ob-tain finer spectroscopy in the off-line analysis of scanning mode.  
        关键词：One-dimension position-sensitive detector;Electron energy loss spectrometer;off-line data-processing   
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        发布时间：2021-03-12
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