最新刊期
      卷 0 ， 期 0 ， 2020
      • BAO Liangman1,2 ZHANG Yuanxun1 JIN Chan1,2 LIN Jun1 LIU Wei1 PENG Lan1 LU Wenzhong1 LI Yulan1 ZHANG Guilin1 LI Yan1 1
        Issue 9, (2008)
        摘要：In order to study the release of trace elements from small coal-fired boiler and their impact on the environment, V, Cr, Mn, Co, Ni, Cu, Zn, As, and Pb in the coal, fly ash, bottom ash and PM2.5 flue gas particles wereanalyzed by Synchrotron Radiation X-ray Fluorescence (SR-XRF) and valence of arsenic were measured by K-edge X-ray Absorption Near Edge Spectrum (XANES). Characteristics of migration and accumulation of the trace elements in the combustion process were studied based on the elemental concentrations in the samples. The results showed that V was depleted in fly ash and enriched in bottom ash. Mo and Co were depleted in bottom ash and enriched in fly ash. Cr, Ni, As, Cu, Pb, and Zn in the bottom ash and fly ash were in enrichment state. As, Cu, Zn, and Pb were significantly enriched in PM2.5. The arsenic in coal was mainly As5+ with small was amount of As3+. During the combustion, As was enriched in PM2.5 and fly ash. The As5+, as a major speciation of As, was about 84%, 81%, and 87% in bottom ash, fly ash, and PM2.5, respectively.  
        关键词：Coal combustion;Speciation;Arsenic;SR-XRF;XANES   
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        发布时间：2021-03-12
      • ZHANG Maolin1,2 WANG Changsui 3 JIN Pujun4 WEI Shiqiang5 XU Wei6 CHEN Dongliang6 WU Ziyu6 1
        Issue 9, (2008)
        摘要：Ru ware was a famous celadon in Song dynasty, whose structure analysis of glaze had always been a difficulty in scientifically analysis of ancient porcelains. The X-ray absorption fine structure spectrum (XAFS) of Fe element in glaze of Ru ware excavated in Qingliang temple was obtained. Fe valence state in porcelain glaze samples was studied by Principle Component Analysis (PCA) along with linear combination fitting method. The main wavelength of the samples was also obtained by colorimeter. The results show that the cyan glaze samples have great Fe2+ /Fe3+ , while the yellow glaze samples have small Fe2+ /Fe3+ . The work also showed that X-ray absorption fine structure spectrum was very suitable in nondestructive analysis of ancient ceramics.  
        关键词：Ru porcelain;X-ray absorption fine structure;Coloring mechanism   
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        发布时间：2021-03-12
      • YANG Yimin1 WANG Lihua1 ZHU Jian1 WANG Changsui1 YAN Yan2 CHEN Dongliang3 HE Wei3 HUANG Yuying3 HUA Wei3 XU Wei3 1
        Issue 9, (2008)
        摘要：Whiteware painted with red, green and yellow patterns play an important role in China’s development in glaze decoration. In this paper, cross-sections of the porcelain samples were scanned from glaze to body by synchrotron radiation and element contents of the samples were analyzed by SRXRF. The results revealed a transition between the glaze and engobe, and the engobe and body. In the transition area, elemental content changes were related to the raw material to form the glaze, engobe and body, and diffusing ability of the elements depended on thickness of the glaze and the elemental contents of each layer. The engobe had lower Fe and Ti concentrations than the body, hence improving the whiteness and quality of the porcelain. According to petrography, engobe was rich in mica minerals, leading to enhanced reflection effect of the white porcelain. This has not been reported before and further studies are underway.  
          
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        发布时间：2021-03-12
      • SUN Hui LUO Hongxin XIAO Tiqiao XU Hongjie
        Issue 9, (2008)
        摘要：The effects of vibration on static stability of a long trace profiler (LTP) was studied in this paper. A model on optical principle of a new LTP was established, and the LTP’s response to environmental vibration was analyzed. It was found that only vertical vibration causes errors of LTP measurement. By using a vibration generator with controllable frequency and intensity, vibration effects on the LTP static stability were checked through contrast experiments. The results indicate that only vertical vibration frequency in a certain range can affect the LTP static stability. This is consistent with the theoretical analysis.  
        关键词：Long trace profiler (LTP);Vibration;Static stability   
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        发布时间：2021-03-12
      • KANG Le LI Zhongliang FENG Liangjie ZHAO Feiyun PAN Guoqiang LI Ruipeng XU Chaoyin
        Issue 9, (2008)
        摘要：Performance of the synchrotron radiation monochromator of a channel-cut crystal with curved surfaces has been analyzed and measured. Comparing with conventional symmetric double-flat-crystal, we found that the throughput, bandwidth and beam exit stability of the channel cut-curved crystal were mainly affected by the asymmetric reflections of the extended beam and the Bragg axis deviation from exact position. It was concluded that the monochromator’s performance could be improved by enlarging dimensions of the reflecting surfaces, and improving precisions of the profiles machined and the Bragg axis positioned for the channel cut-curved crystal.  
        关键词：Channel cut-curved crystal;Asymmetry factor;Relative reflectivity;Bandwidth of the reflection   
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        发布时间：2021-03-12
      • LIU Hui1 GAO Xueguan2 YAO Jing2 1
        Issue 9, (2008)
        摘要：An inportant technology of synchrotron radiation beam lines is how to solve thermal distortion of the 1st crystal of monochrotron. In this paper, we propose a new structure to reduce the thermal distortion. Simulation analyses were made using finite element method to analyze two types of water cooling structures. It was concluded that the cooling structure could decrease greatly the thermal distortion.  
        关键词：Synchrotron radiation;Cooling structure;Double-crystal monochrotron   
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        发布时间：2021-03-12
      • TIAN Jinping LI Wenjie CHEN Jie LIU Gang XIONG Ying LIU Longhua HUANG Xinlong TIAN Yangchao
        Issue 9, (2008)
        摘要：A high resolution X-ray microscope endstation was constructed on a wiggler beamline at the National Synchrotron Radiation Laboratory (NSRL). Parameters of the ellipsoidal glass capillaries as condensers were calculated and designed based on the illumination requests in the X-ray microscope system. Performance of the ellipsoidal glass capillaries was tested. The results indicate that the beam size agrees with the designed parameters and focus efficiencies of the ellipsoidal glass capillary condensers are better than 85%.  
        关键词：X-ray microscope;Ellipsoidal glass capillary condenser;Synchrotron radiation;Focus efficiency   
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        发布时间：2021-03-12
      • JIN Wei1 WEI Biao2 LI Jinxiang1 YANG Rener1 ZHOU Yaxun1 1
        Issue 9, (2008)
        摘要：An algorithm for neutron and X-ray image fusion using WBCT (Wavelet-Based Contourlet Transform) was proposed. The WDCT inherits the multi-scale characteristic of wavelet transform and outperforms wavelet transform in representation of high dimensional singularity of image, enabling it to synthesize information of different images effectively. In order to overcome the shortcoming of pixel-based fusion, the method realizes the local adaptive fusion through NHM (Neighborhood Homogeneity Measurement). Experiments show that this algorithm retains more image detail and therefore provides more accurate information than traditional image fusion methods. It is proved to be a novel idea for the complementary application of neutron imaging and X-ray radiograph.  
        关键词：Image fusion;Wavelet-based contourlet transform;Local adaptive fusion;Neutron radiation image;X-ray radiation image   
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        发布时间：2021-03-12
      • ZHANG Xinyun1,2 WANG Hengdong1 YE Yin1 YAO Side 1 1
        Issue 9, (2008)
        摘要：Pt nanoparticles supported on carbon nanotubes (CNTs) were obtained by γ -ray irradiation and characterized by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results indicated that characteristics of the Pt-Pd nanoparticles were affected by radiation dose, pH value and surfactant. The Pt-Pd nanoparticles, about 10 nm in diameter, were uniform in both shape and size and well dispersed on the carbon nanotubes. The efficiency in using the Pt and Pd could be improved by increasing the dose, adjusting pH value of the solution to the range of 7 to 8.5, or adding surfactant.  
          
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        发布时间：2021-03-12
      • WANG Yiyuan1,2 LU Wu1 REN Diyuan1 ZHENG Yuzhan1,2 GAO Bo1,2 LI Pengwei1,2 YU Yue1,2 1
        Issue 9, (2008)
        摘要：Total-dose effects and room-temperature annealing behavior of bipolar digital-to-analog converter (DAC) irradiated by 60Co γ-rays were investigated. The results show that the response of the DAC is different between low- and high-dose-rate irradiation. It was found that the integrated circuits exhibit ELDRS and time dependence effect as well. Based on the space charge model, possible mechanism for this response is discussed.  
        关键词：DAC;Radiation effect;Room-temperature annealing;ELDRS (enhanced low dose rate sensitivity)   
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        发布时间：2021-03-12
      • ZHANG Hongbin LU Ziwei XU Hushan XIAO Guoqing LI Zhankui
        Issue 9, (2008)
        摘要：Carbon stripping foils were prepared by AC or DC arc discharge method. Sandwich carbon foils were prepared by alternative AC-DC discharge. The carbon stripping foils prepared by different methods have different lifetime. It has been shown that different prepared methods of carbon stripping foils have different structure. The measurement and analysis of SEM/TEM images of carbon stripping foils prepared with different methods and the relationship between microstructure and lifetime of carbon foils were described in this paper.  
        关键词：Carbon stripping foil;SEM/TEM;AC/DC arc discharge method   
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        发布时间：2021-03-12
      • LIU Ciyi ZEN Jun HUANG Gang
        Issue 9, (2008)
        摘要：This work was aimed at finding a 99Tcm-labeled tracer for tumor angiogenesis studies. Anti-angiogenesis peptides, with appropriate structural modified, were labeled with 99Tcm and screening in vivo on the tumor-bearing mice. The anti-angiogenesis peptide that has the highest accumulation of radioactivity in tumor was chosen for the tissue distribution and tumor competition on the tumor bearing mice. The GPRPAA(D)A(D)-HYNIC-99Tcm had strong activity distribution in tumor with very low background activities in other tissues, and was quite stable with high radio labeling ratio. GPRPAA(D)A(D)-HYNIC-99 Tcm could become a tracer of tumor angiogenesis.  
        关键词：99Tcm;Anti-angiogenesis;Peptide;Tumor tracer;Animal experiments   
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        发布时间：2021-03-12
      • NIU Guosai1,2 LUO Shineng2,1 YAN Xiaohong1,2 YANG Min2 YE Wanzhong2 XIA Yongmei1 1
        Issue 9, (2008)
        摘要：To evaluate the feasibility of 99Tcm-2-(2-ethylicimidazol-1-yl)-1-hydroxyethane-1,1-diphosphonic acid (EIDP) as a bone imaging agent, EIDP was synthesized by three-step reactions from 2-ethylicimidazol and 99Tcm-EIDP was prepared with SnCI2 in 10 min at room temperature. Normal mice were injected intravenously with 1.0 MBq 99Tcm-EIDP of 0.2 ml and sacrificed at different phase after injection. Samples of heart, liver, spleen, lung, kidney, muscle, bone and blood were taken for uptake (in %ID/g) measurement, and the bone-to-organ uptake ratios were calculated. The blood clearance kinetics was calculated, too. Bone imaging was performed in normal rabbit after intravenous injection. The total yield for the preparation of EIDP was 35.5%. Both the labeling yield and radiochemi- cal purity of 99Tcm-EIDP were over 95%. The bone uptake is up to 23.76 %ID/g at 1h after the injection. The bone-to-blood and bone-to-muscle uptake ratios were 33.94 and 95.04, respectively. The kinetics equation was: C = 1090.736e-6.982t + 84.956e-0.379t, and the initial half life and late half life were 4.76 and 105.5 min respectively. A clear bone imaging of rabbit was obtained 2h after injection. The 99Tcm-EIDP, which can be prepared conveniently, exhibited high uptake in bone and would be a potential bone imaging agent.  
        关键词：99Tcm-EIDP;Animals experiment;Pharmacokinetics;Skeleton;Radionuclide imaging   
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        发布时间：2021-03-12
      • YANG Jun TANG Jun XU Qiaoling YANG Yi LIU Zengli
        Issue 9, (2008)
        摘要：In this paper, bio-distribution of 99Tcm-EC-guanine in mice was evaluated using TLC and paper chromatography to determine the labeling efficiency and radiochemical purity. Forty eight healthy Kunming mice were divided in random into 8 groups, which were given with 3.7 MBq 99Tcm-EC-guanine via i.v. injection. They were sacrificed by cutting the carotid at different minutes or hours after injection for radioactivity measurement of the tissues or organs. The bio-distribution of radioactivity in the samples was calculated as a percentage of the injection dose per gram of wet tissue weight (%ID/g). Meanwhile, three normal Kunming mice and LOVO tumor-bearing mice were injected with 74 MBq 99Tcm-EC-guanine and imaged with clinical SPECT at the same time as the 8 groups after injection. The labeling efficiency of 99mTc-EC-guanine was 98% and its radiochemical purity was over 95% in 8 h. The bio-distribution in all the samples but kidney decreased rapidly in 30 minutes after injection. The results demonstrated that 99Tcm-EC-guanine was metabolized through kidney and liver, in which the %ID/g were 20.66 and 13.22 at 5 min, 15.43 and 7.03 at 30 min, and 11.37 and 7.31 at 4h, respectively. The %ID/g of brain was less than 0.5 at any time. A little distribution appeared in muscle, the %ID/g were 1.11 at 30 min and 0.65 at 4 h. In heart, lung, spleen, stomach, intestine and bones, there were little distributions. The SPECT images showed similar bio-distribution. The tumor was clearly visualized in LOVO tumor-bearing mice. 99Tcm-EC-guanine, which can be labeled easily with high efficiency and radiochemical purity, is probably a good imaging agent for guanine metabolism.  
        关键词：99Tem labeled guanine;EC-Guanine;Bio-distribution in mouse   
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        发布时间：2021-03-12
      • WANG Qiang1,2 JIN Dapeng1 LIU Zhen’an1 ZHAO Dixin1 1
        Issue 9, (2008)
        摘要：A multi-channel scaler system was designed for system check and status monitoring of the BESШ trigger system. It is composed of a PC, two PCI interface multi-channel scaler cards, the corresponding drivers and user programs. A total of 64 signals can be scaled and monitored in real time. The scaled data are recorded locally and some of them are distributed to the online system. In this paper, the hardware structure, software development and long time stability of the system are introduced.  
        关键词：Multi-channel scaler;PCI;LabVIEW;Trigger   
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        发布时间：2021-03-12
      • CHEN Yixin LIANG Hao XUE Jundong LIU Qiang LIU Baoying ZHOU Lei YU Xiaoqi ZHOU Yongzhao
        Issue 9, (2008)
        摘要：Development of front-end card of muon counter for the BES III (Beijing Spectrometer III) project is presented in this paper. The system structure, functions of the components, strobe logic design, anti-jamming and realization with FPGA are introduced. The front-end card and data-chain worked perfectly under the given conditions, and the design goals were achieved.  
        关键词：FPGA;Muon counter;Front end card   
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        发布时间：2021-03-12
      • ZHANG Lin CHEN Zongyu NIE Zhenlong LIU Fuliang JIA Yankun ZHANG Xiangyang
        Issue 9, (2008)
        摘要：The relation between isotopic compositions of precipitation and surface air temperature provides a unique tool for paleoclimate studies, among which the relation between long term changes in δ 18O of precipitation and surface air temperature at different stations or in a given location seems to be the most appropriate to paleoclimatic reconstructions. Analysis was conducted on monthly and annual mean δ 18O content of precipitation and surface air temperature at spatial and fixed locations by using the data of China (1985～2002) in Global Network of Isotopes in Precipitation (GNIP) Database. This study shows that there is a positive correlation between δ 18O of precipitation and surface air temperature for stations located in north of 34 ° ~ 36 ° N latitudes. The seasonal δ 18O-temperature gradient derived from the monthly data of 12 stations in northern China is about 0.34‰℃-1. The δ 18O-temperature gradient, however, derived from the long term annual mean data of 13 stations, is about 0.52‰℃-1, which is substantially larger than the seasonal gradient.  
        关键词：Precipitation;Oxygen isotope ratio;Temperature;Correlation   
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        发布时间：2021-03-12
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