最新刊期
      卷 0 ， 期 0 ， 2020
      • ZHANG Yunwu SHENG Liusi GAO Hui ZHANG Guobin
        Issue 7, (2003)
        摘要：This paper describes the optical design of a high-resolution spherical grating monochromator beamline being constructed in National Synchrotron Radiation Laboratory at University of Science and Technology of China. The beamline consists of a spherical grating monochromator with two including angles, a pre-focusing mirror system composed of a horizontal deflection plane mirror and a vertical focusing cylindrical mirror, and a post-focusing toroidal mirror. It has high resolution power and high photon flux over the designed energy range. Results of optical raytracing are also presented.  
        关键词：Undulator radiation;Spherical grating monochromator;Beamline CLC TH744.1   
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        发布时间：2021-03-12
      • ZHANG Jianbing WANG Fang
        Issue 7, (2003)
        摘要：When the amplitude loop of the RF system is opening, the beam will introduce a field that can compare with the working cavity voltage. As the beam energy is higher, the beam needs more power from the cavity and the dissipated power on the cavity should keep unchanged. As a constituent of the monitor programs, a method of multi-threading serial communication to control the driver low-level of the RF system in SSRF is introduced.  
        关键词：RF system;Loop control;Driver low-level;Serial communication CLC TP393.09   
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        发布时间：2021-03-12
      • DAI Jianping LUO Yingxiong LI Deming ZHANG Jianbing GU Qiang
        Issue 7, (2003)
        摘要：As one of the most important parts of the SSRF linac, the buncher was developed in the R&D of SSRF. In this paper, the design, the manufacture and the RF test results are described.  
        关键词：Buncher;PARMELA Code CLC TL501   
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        发布时间：2021-03-12
      • ZHAO Feiyun1 WANG Naxiu2 XU Chaoyin1 WANG Qiuping1 1
        Issue 7, (2003)
        摘要：A water cooling mask is an important part of the front end, usually used for absorbing high power density synchrotron radiation to protect the apparatus from being destroyed by heat load. This paper presents the structure of the water cooling mask and the thermal analysis results of the mask block at NSRL using Program ANSYS5.5.  
        关键词：Front end;Movable water cooling mask;Structure;Thermal analysis CLC TL544   
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        发布时间：2021-03-12
      • YE Bangjiao1,2 Nanjyo H 2 Kobayashi T 2 Tsuno S 3 Hasuko K 2 1
        Issue 7, (2003)
        摘要：The NE213 scintillator has been widely used as a detector of fast neutrons, under environments with a high background of gamma rays. A technique using a two-gate integration method to do neutron-gamma pulse shape discrimination is reported. Fast and total signals are selected to make a two-dimensional plot. A 252Cf fission neutron source and the mono-energy neutrons produced by d+D reaction are used to investigate f5"2", f5"5" and f8"2" NE213 organic scintillators. By selecting a suitable gate range, we get the n-g discrimination extremely well. For the 5"2" NE213 scintillator, the optimal gate range of fast signal is 30ns.  
        关键词：NE213 scintillator;n-g discrimination;d+D reaction CLC O571.53   
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        发布时间：2021-03-12
      • LIU Jing1 ZHANG Peiqun1 ZHANG Borun2 QIAN Qinfang1 CHEN Chunying1 CHAI Zhifang1 DING Wenjun1 1
        Issue 7, (2003)
        摘要：The instrumental neutron activation analysis was used to determine Cr content in chromium-rich yeast cells. Through a series of tests, the optimized cultivation parameters of Saccharomyces cerevisiae LZ-53 were obtained as follows: wort as medium, 10Brix sugar concentration; Cr 1200mg/mL in wort; the initial pH6.0; 8% culture medium; inoculum volume 10% (V/V), and yeast cells harvested in 30 h. Under the optimized cultivation conditions, the chromium content of strain LZ-53 reached 3248mg/g.  
          
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        发布时间：2021-03-12
      • LI Jin ZHANG Ziping CHEN Hongfang XU Tong WU Jian
        Issue 7, (2003)
        摘要：General properties for PWO crystals in the electromagnetic calorimeter of CMS were studied with detailed simulation. Various energy reconstruction methods and related energy resolution were compared. The capability of identifying neutral pion and gamma at high momentum was also studied and discussed by using Neural Networks.  
          
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        发布时间：2021-03-12
      • GU Jianzhong ZHU Jinliang WU Minghong SHI Xin JIAO Zheng
        Issue 7, (2003)
        摘要：There are very high values of the chemical oxidation demand (COD) in the effluent from pulp mills. The COD value of the effluent is still higher after traditional biological treatment. The biologically treated wastewater from pulp mill was irradiated using low energy EB. For the wastewater irradiated with a dose of less than 1kGy, its COD value was reduced to 1/4 of the value for unirradiated wastewater. Chromaticity of the irradiated-wastewater was also greatly decreased. The UV-visible spectra of a significant constituent of the wastewater indicated that the contaminants were degradated well.  
          
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        发布时间：2021-03-12
      • ZHOU Wenjun JIA Baoshan YU Jiyang
        Issue 7, (2003)
        摘要：This paper presents conceptual design for a passive residual heat removal (PRHR) system of the pressure tube water reactor (PTWR) that is called thorium-based advanced nuclear energy system (TANES) as well. The passive PRHR system includes two nature circulation loops to transfer the reactor residual heat to the heat sink. The RETRAN02 code was used to calculate the ability of the passive PRHR system of TANES at the design-based accident of losing conventional and dependable electrical power under full power. The calculation gave the conclusion that the passive PRHR system can remove the reactor residual heat to the ultimate heat sink and keep the pressure of the coolant loop and the moderator loop less than the limitations. Some factors such as the elevation of the heat exchanger are also studied.  
        关键词：Pressure tube water reactor (PTWR);Residual heat removal system;Passive;Natural circulation   
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        发布时间：2021-03-12
      • YANG Tongzai PENG Xianjue LIU Yinong MA Jun YANG Yanqiu XING Pifeng
        Issue 7, (2003)
        摘要：Effects of volume fractions of activated carbon and silicon dioxide in bentonite on the diffusion coefficient and retardancy (retardant ability) of tracer gas SF6 were studied. The results showed that the diffusion coefficient increases with increasing silicon dioxide, but decreases with increasing activated carbon. Addition of activated carbon to bentonite can enhance its adsorptivity, thus resulting in a better retardancy. On the other hand, addition of silicon dioxide will lead to a reduction of retardancy though some physical characteristics can be improved. The optimum volume fraction of activated carbon and silicon dioxide was 5% each.  
        关键词：Sulfur hexafluoride;Bentonite;Diffusion;Optimization   
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        发布时间：2021-03-12
      • ZHU Nankang WANG Chunlei ZHANG Youjiu
        Issue 7, (2003)
        摘要：This paper described in detail the radiation vulcanization of natural rubber latex (RVNRL) in respect of its advantages, history, mechanism, process and main factors affecting the product quality. RVNRL will bring about great benefits to health care business and environment protection. To make it come true on an industrial scale, the processing cost must be reduced. RVNRL using EB can reduce the cost to an acceptable level compared to the chemical vulcanization process, and it is expected to have a promising future.  
        关键词：Natural rubber latex;RVNRL;Vulcanization process;Cost analysis   
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        发布时间：2021-03-12
      • WANG Lihua WANG Yongxian YIN Duanzhi
        Issue 7, (2003)
        摘要：Receptor targeting with radiolabeled peptides has become very important in nuclear oncology in the past few years. The most frequently used peptides in the clinic are analogs of somatostatin, e.g. octreoscan, which contain chelators for the radioisotopes 111In, 90Y, 67Ga, 68Ga and 64Cu or for 99Tcm and 188Re, and are labeled with the halogens 123I and 18F. Somatostatin analogs and their radiolabeling are introduced in this article, and the most frequently used somatostatin analog imaging agents are reviewed. In addition, some important developments in exploiting these agents are presented too.  
        关键词：Somatostatin;Octreotide;Radiolabeling;Biodistribution;Receptor imaging agent CLC R817   
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        发布时间：2021-03-12
      • PENG Jiwei GU Yingjie YAO Liqiang YOU Risheng LU Jingmin WEN Zhutang
        Issue 7, (2003)
        摘要：In this paper described is the absorbed dose deternination of three types X(g) knives at isocenter point in different radiation fields by using a 160-mm diameter PMMA spherical phantom and a 0.015cm3 PTW 31006 type pinpoint ionization chamber which can be inserted into the center of the phantom. The measured data were compared with those measured by a semiconductor detector (with sensitive volume of 1mm?mm?.5mm). A comparative study on the applicability of the two detectors was carried out, and a method suitable for the absorbed dose determination of X(g) knife was put forward.  
        关键词：X(g) knife;Absorbed dose;Spherical phantom CLC R144.1   
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        发布时间：2021-03-12
      • TANG Ganghua
        Issue 7, (2003)
        摘要：Great progress in synthetic methodologies of short half-life radiopharmaceuticals for PET has been made. This article aims to summarize the synthetic methodologies and progress of fluorine-18, carbon-11, oxygen-15 and nitrogen-13 labelled radiopharmaceuticals, with special emphasis on the radiochemistry of those labelled with carbon-11 and fluorine-18.  
        关键词：Short half-life nuclides;Radiopharmaceuticals for PET;Synthetic methodology CLC R817   
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        发布时间：2021-03-12
      • HU Youhua1 QI Chenze1,2 LIU Weimin3 WANG Baoyi4 SUN Xudong1 WANG Tianmin5 ZHENG Xiaoming2 1
        Issue 7, (2003)
        摘要：The free volume properties of high impact polystyrene (HIPS)-low density polyethylene (LDPE) blend have been investigated by means of positron annihilation lifetime spectra (PALS). The measured results show that one component in blends has not large enough size of free volume holes to accommodate the lateral chains and end groups of the other component, thereby producing the immiscibility when blending HIPS and LDPE. In addition, it is found also that the interfacial polarization can result in a decrease in o-Ps intensity I3 during the PALS measurement. The negative deviation of free volume fraction fapp in the measured blends is mainly attributed to the negative deviation of I3.  
        关键词：High impact polystyrene;Low density polyethylene;Blend;Positron annihilation lifetime spectra CLC O631.1+1   
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        发布时间：2021-03-12
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