最新刊期
      卷 0 ， 期 0 ， 2020
      • QI Zeming1 LI Chengxiang 1 HONG Yilin 1 YIN Ming 1 CHENG Xuerui 2 LI Tingting 1 1
        Vol. 31, Issue 12, (2008)
        摘要：In this paper, a review is given on progresses in synchrotron infrared radiation, and the infrared beamline upgrade design, performance and research program at NSRL are introduced. The original infrared beamline constructed in phase II of the NSRL project cannot benefit from advantages of synchrotron and meet the rapid demand of infrared research. We redesigned and optimized optical elements of the beamline to extend the spectrum region to 10 cm-1 and constructed a new microspectroscopy experimental station. The test shows that the synchrotron infrared radiation has obvious brightness advantage, which provides a power tool for microspectroscopy research.  
        关键词：Infrared synchrotron radiation;Beamline;Brightness;Infrared spectrum;Microspectroscopy   
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        发布时间：2021-03-12
      • LI Ming1,2 SHI Hong2 DONG Shuqiang2,3 LIU Peng2 1
        Vol. 31, Issue 12, (2008)
        摘要：Instability monitoring of synchrotron radiation (SR) was a problem in operating the Beijing Synchrotron Radiation Facility (BSRF). With progresses in the Beijing Electron Positron Collider (BEPC) upgrading project, great performance improvement of the SR source is required, too, hence the need of the monitoring the source instability. A photon beam position monitor (PBPM) of double wedge-blades type in BSRF has been developed and used for the front end zone. The PBPMs can effectively monitor 10 μ m change in the SR beam position, and provide important guarantee of the light stability and the quality of experiment data. In this paper, we report physical design, parameter optimization and error analysis of the PBPMs. Descriptions on their applications in the BSRF are given briefly.  
        关键词：Photon beam position monitor;Monitor function;Synchrotron radiation   
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        发布时间：2021-03-12
      • WANG Jia’ou1 QIAN Haijie1 DUAN Yi2 ZHONG Jun1 QUAN Zhengling1 SHI Hong1 IBRAHM K1 1
        Vol. 31, Issue 12, (2008)
        摘要：In order to meet demand for improving the photoelectron spectroscopy station at BSRF, the control system and data acquisition software have been reconstructed. The functions of the new software include the choosing the photo-energy and the data collecting. To fit with a variety of demands from users, the new software has to be very flexible, user-friendly and effective.  
        关键词：Synchrotron radiation;Photoelectron spectroscopy;Software design;LabVIEW   
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        发布时间：2021-03-12
      • XU Shenghui XU Ruinian KE Xinhua SHEN Tianjian
        Vol. 31, Issue 12, (2008)
        摘要：To upgrade the DPSC-100, a controller for digital power supplies of Shanghai Synchrotron Radiation Facility, an embedded system using μC/OS-II was proposed. Key points to transplanting μC/OS-II to TMS320F2812 are discussed in this paper. The DPSC-100’s state transfer and design of the control program based on μC/OS-II are given.  
        关键词：SSRF;Digital power supply controller;μC/OS-II;Embedded system   
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        发布时间：2021-03-12
      • WU Yuyu1 LIU Jinfeng1,2 SUN Bai1,3 LIU Zhongliang1 XU Pengshou1 CHEN Xiufang4 XU Xiangang4 1
        Vol. 31, Issue 12, (2008)
        摘要：Synchrotron-radiation photoelectron spectroscopy (SRPES) and X-ray photoelectron spectroscopy were used to study the early growth mode of Mn deposited on 6H-SiC(0001) surface and Mn/6H-SiC(0001) interface. The results show that the early growth mode at room temperature can be considered as the 2D layer-by-layer mode. With increasing coverage of Mn, the surface reflected a clear metallic characteristic. During the deposition, Mn was quite stable on the SiC surface, a downward Fermi level movement in band structure measurement was observed and the resultant Schottky Barrier Height (SBH) was estimated at about 1.79 eV. When the deposition height was 2nm, annealing the sample at 250°C could induce Mn to diffuse into the SiC substrate, without any chemical reaction. Further annealing at 500°C there were Mn silicide formation at the interface.  
        关键词：Synchrotron-radiation;Photoelectron spectroscopy;Ohmic contact;Mn/SiC   
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        发布时间：2021-03-12
      • HUANG Chaoqiang SONG Jianming LI Xinxi XIA Qingzhong CHEN Bo
        Vol. 31, Issue 12, (2008)
        摘要：Beam homogeneity, collimation and flux at the exit (C3) of a cold neutron guide(NG) were simulated by MCSTAS1.9 based on the layout of a cold neutron source (CNS) and NG.. The optimization shows that a) the distance (LS-NG) between CNS and the NG entrance should be as short as possible; b) the flux and Y divergence increased by 24% and 61%, respectively, while the supermirror factor m increased from 1.5 to 3.0; c) divergence in the normal direction of NG curved pane (Y) can be described with a Gaussian function, but divergence in the direction of curved plane (X) was in strips; and d) when m=1.5 and LS-NG=2.29 m, the Y-divergence was 0.86° and the flux was 2.44×107 cm–2·s–1.  
        关键词：Cold neutron guide;Supermirror;Neutron beam characteristics;Cold neutron source;Monet Carlo simulation   
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        发布时间：2021-03-12
      • WU Jianping ZOU Yongxiang HUANG Chunfeng ZHOU Jianbin LI Bingbing
        Vol. 31, Issue 12, (2008)
        摘要：X-ray fluorescence analysis has been used to track and monitor the on-site analysis of rock cuttings in oil drilling field. BP (Back Propagation) models of multi-layer neural networks were established to describe different lithology of strata by the binary code through continuously sampling powder-like rock cuttings at the scene.  
        关键词：X-ray fluorescence analysis;Lithology identification;Neural networks   
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        发布时间：2021-03-12
      • YAN Yajuan1,2 LI Zongwei1 LIU Jianling2 QIN Guangyong1 1
        Vol. 31, Issue 12, (2008)
        摘要：A strain DC-3-2-50 was obtained through N+ implanting into Yarrowia lipolytica DC-3-2. An increase of 11.09% in the oil-degradation rate was obtained. The stain has good genetic stability after 10 times of subculture. The culturing condition of DC-3-2-50 was studied. The optimal culture conditions were as follow: initial pH value, 9.0; inoculum size, 3%; temperature, 25~28°C; dissolved oxygen, 180~200 rpm; and carbon nutriments soybean salad oil. The oil-degradation rate can be up to 87.7%.  
        关键词：N+ implantation;Yarrowia lipolytica;Inoculum size;Dissolved oxygen   
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        发布时间：2021-03-12
      • WU Yunyun SHANG Bing
        Vol. 31, Issue 12, (2008)
        摘要：To guarantee the quality of measurements, the radon-thoron discriminative detector improved by our laboratory was calibrated at Radon Laboratory of University of South China, and participated in the international in- tercomparison organized by NIRS(National Institute of Radiological Sciences)in Japan. The calibration result demon- strated that correlation between the exposure level and the track density was fairly good for both radon and thoron, with the correlation coefficient of 0.9894 and 0.9885, and the calibration factors of 4.27 ± 0.40 and 2.33 ± 0.39 tracks·cm–2·(kBq·m–3·h)–1 for radon and thoron, respectively. According to the results of inter-comparison, in pure ra- don, relative percent difference from the reference value (RPD) was 12% and coefficient of variation (COV) was 7.7%, ranking category B of NRPB, and was in the control level of EPA; while in high 220Rn condition, RPD and COV for thoron were 22% and 4.8%, respectively. Concerning the higher deviation for thoron measurement, the cause should be further discussed.  
        关键词：Radon;Thoron.;Calibration;Intercomparison;Discriminative detector   
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        发布时间：2021-03-12
      • KANG Xi1 XIAO Detao2 LI Junli1 1
        Vol. 31, Issue 12, (2008)
        摘要：Based on uncertainty analysis of the α spectroscopy program for measuring the 222Rn/220Rn daughters, the relationships among the sampling time, measurement intervals, and total measurement time and measurement uncertainty are studied in details, and an optimal measurement program was given for quick and accuracy determination of the 222Rn/220Rn daughter concentrations in air. The optimal program was also proved by comparing the results with several measurement programs by other researchers in theory and practice.  
        关键词：Radon daughters;Thoron daughters;α energy spectrum   
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        发布时间：2021-03-12
      • XU Fenghua1,2 YIN Duanzhi1 WANG Yongxian1 1
        Vol. 31, Issue 12, (2008)
        摘要：188Re (T1/2=16.9h) is an ideal and attractive therapeutic radionuclide (Eβmax=2.11MeV) with emission of γ (Eγ=155keV) suitable for imaging. This paper reviews the methods and progresses in researches on 188Re labeling biomolecules. It is encouraging that 188Re-labeled radiopharmaceuticals have prospective applications in cancer therapy.  
        关键词：188Re;Radiopharmaceutical;Bio-labeling   
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        发布时间：2021-03-12
      • SHI Zhubin1 SANG Wenbin1 QIAN Yongbiao1,2 TENG Jianyong1 MIN Jiahua1 FAN Jianrong1 LIU Jishan3 1
        Vol. 31, Issue 12, (2008)
        摘要：CZT Frisch capacitance device uses two flat electrode connecting the cathode side of metal layer and connected, and insulating layer between the isolation. According to Frisch capacitance detector structure and the parameters of pre-amplifier, ac coupling was used. The depletion of high transconductance FET as the input stage, the composition of a capacitor and resistance as the feedback of the charge sensitive preamplifier were selected. The results show the design and manufacture of low noise, high-performance of the pre-amplifier for CZT Frisch detector is successful. Finally, the test results were given.  
        关键词：CdZnTe detector;charge sensitive preamplifier;Frisch detector   
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        发布时间：2021-03-12
      • XUE Jundong LIANG Hao CHEN Yixin LIU Qiang LIU Baoying ZHOU Lei YU Xiaoqi ZHOU Yongzhao
        Vol. 31, Issue 12, (2008)
        摘要：In the prototype of the Front End Electronics(FEE) readout system of muon counter for the BES-III project, the data, converted by Front End Cards(FEC), are transmitted into readout modules, located from the FEC 30 meters away. Readout modules receiving and compressing data, readout modules send data to USB port while they send control commands to test FECs with some relative driving signals.  
        关键词：Data collection;Muon counter;USB   
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        发布时间：2021-03-12
      • YANG Haijun1,2 LI Hai1 WANG Peng1 LI Bin1 1
        Vol. 31, Issue 12, (2008)
        摘要：In this paper, a new and facile route was developed to efficiently print protein microarrays onto hydrophobic polydimethylsiloxane (PDMS) substrate. The unique feature of this method was that protein could be easily transferred onto PDMS substrate by first physically adsorbing EDTA molecules on the PDMS surface. AFM results showed that the transferred patterns are of high fidelity and density with average width of about 500 nm and the interval of 1μm.  
        关键词：Microcontact printing;Polydimethylsiloxane;Physical adsorption;AFM;Protein microarray   
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        发布时间：2021-03-12
      • WANG Huabin1,5 AN Hongjie2 YANG Haijun1,5 WANG Peng1,5 SUN Jielin4 ZHANG Yi1 LIU Zhongdong3 HU Jun1,4 1
        Vol. 31, Issue 12, (2008)
        摘要：A newly developed sample preparation technique termed multi-step spin-coating method was used to prepare well-dispersed xanthan molecules on bare mica, 3-aminopropyl triethoxysilane treated mica, nickel ion treated mica and highly oriented pyrolytic graphite, which are widely used as supporting surfaces in the atomic force microscopy (AFM) study. The substrate effects on conformation of single xanthan molecules were also investigated. We believe that this study is of great importance for the in-depth studies on xanthan molecules at the single-molecular level.  
        关键词：Xanthan;Sample preparation;Spin-coating;Atomic force microscopy   
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        发布时间：2021-03-12
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