最新刊期
      卷 0 ， 期 0 ， 2020
      • WEI Xun1 XIAO Tiqiao1 CHEN Min1 LUO Yuyu1 XI Zaijun1 LIU Lixiang1 DU Guohao1 XU Hongjie1 Tian Yulian2 ZHU Peiping2 HUANG Wanxia2 YUAN Qingxi2 1
        Issue 10, (2004)
        摘要：The alkaloids are organic nitrogenous bases found mainly in plants, which deposit with certain reagents in water. These precipitation reactions can be used to determine the alkaloids’ existence and to refine them. The present paper studied three different types of alkaloidal precipitates by X-ray phase-contrast imaging (XPCI) based both on Beijing Synchrotron Radiation Facility (BSRF) and on a nanofocus X-ray tube laboratory system. The XPCI results reveal the needle precipitate of colchicines (amine alkaloid), the micelle precipitate of arecoline (pyridine alkaloid) and the petal precipitate of berberine (isoquinoline alkaloid). Comparison of the results obtained by different methods has been made to verify the feasibility of XPCI’s future application to more complicated chemical systems.  
        关键词：X-ray phase-contrast imaging;Alkaloid;Precipitate;Structure   
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        发布时间：2021-03-12
      • YUAN Qingxi TIAN Yulian ZHU Peiping HUANG Wanxia WANG Junyue HU Tiandou JIANG Xiaoming Wu Ziyu
        Issue 10, (2004)
        摘要：As a technique for X-ray phase contrast imaging, diffraction-enhanced imaging (DEI) attracts much interest for its high resolution and good image quality. Some research work has also been carried out at Beijing Synchrotron Radiation Facility (BSRF) during the past few years. In general DEI set-up, the obtainable image area is less than 20 mm×4 mm when cross section of the incident “white” X-ray beam is 20 mm×10 mm, which means general DEI set-up is deficient for large samples. Based on the analysis of general DEI set-up, a new set-up has been designed and applied in DEI experiments. In new DEI set-up, obtainable image area is for the first time as large as incident “white” X-ray beam. Resolution of image obtained using new DEI set-up is around the order of micrometer.  
        关键词：Synchrotron radiation X-ray;Diffraction-enhanced imaging;Image size;X-ray phase contrast imaging   
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        发布时间：2021-03-12
      • ZHANG Guobin SHI Junyan QI Zemin ZHOU Hongjun HUO Tonglin FU Yibing
        Issue 10, (2004)
        摘要：Problems of the existing vacuum ultraviolet beamline were analyzed, and a reconstruction project was proposed. By the optical ray tracing optimization, a new optical design and optical element parameters were fixed. Measured results confirm the validity of the reconstruction.  
        关键词：Beamline reconstruction;Ray tracing;Flux measurement   
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        发布时间：2021-03-12
      • FU Yuan ZHU Yi XIA Shaojian
        Issue 10, (2004)
        摘要：In this article we discuss the design of double-crystal monochromator control system of 3B3 middle-energy beam line in Beijing Synchrotron Radiation Factory. The multimedia timer and multithread technique were used to solve the high speed data transmission in serial port system and data communication in multi-serial port system. The real time graph drawing and dynamic zooming in double-crystal monochromator debugging system accomplished by VC++6.0 were also described.  
        关键词：Multimedia timer;Multithread technique;Serial port communication;Dynamic zooming   
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        发布时间：2021-03-12
      • SHI Jiyan1 CHEN Yingxu1 YUAN Xiaofeng3 WU Bei1 HUANG Yuying2 HE Wei2 1
        Issue 10, (2004)
        摘要：Through the gel filtration chromatography on Sephadex G-50, two different Cu-binding proteins were separated from copper treated Elsholtzia splendens roots. The elements distribution in the two Cu-binding proteins was investigated by SRXRF. The results showed that the Cu-chelate ability of Cu-binding protein 2 is better than that of Cu-binding protein 1. Besides, Pb, Fe, and Zn can compete with Cu to chelate the Cu-binding proteins. The content of element S is very low in the two Cu-binding proteins, which demonstrates that MTs or PCs are not dominant in the Cu-binding proteins in Elsholtzia splendens roots. The experiment also has proved that SRXRF can be used to study elements distribution in the protein separated by gel filtration chromatography.  
        关键词：Elsholtzia splendens;SRXRF;Cu-binging protein;Gel filtration   
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        发布时间：2021-03-12
      • HUA Wei1,2 HUANG Yuying1 HE Wei1 WU Ziyu1 1
        Issue 10, (2004)
        摘要：The progress of high-resolution large-acceptance analyzer for X-ray fluorescence by synchrotron radiation and its applications in the structural analysis of material chemistry in recent years were briefly reviewed. The essential structure and principle of the instrument were described. The applications of high-resolution X-ray fluorescence spectroscopy in magnetic materials and metalloproteins were also presented.  
        关键词：Synchrotron radiation;X-ray fluorescence;High-resolution;Chemical state analysis   
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        发布时间：2021-03-12
      • ZOU Yubin GUO Zhiyu
        Issue 10, (2004)
        摘要：The main sources of systematic errors in measurements of high-current ion beam emittance with slit-wire method are discussed. The errors with different sources were estimated by simulating the measuring process. For the measurements of rms emittance, the systematic errors due to sampling by slits, omitting the slit width and wire diameter as well as the space charge effect can be omitted. But the limitation of slit length and selecting a large threshold can cause significant systematic errors.  
        关键词：Emittance;Measurements;Slit-wire method;Systematic errors;Simulation   
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        发布时间：2021-03-12
      • ZHANG Hong1,2 CHAI Zhifang1,2 SUN Huibin2 ZHANG Jiali1 OUYANG Hong1 XING Li1 CHUAI Yuduo3 1
        Issue 10, (2004)
        摘要：The concentrations of total halogen (TX), extractable organo-halogen (EOX), extractable persistent organo-halogen (EPOX), organo-chlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in 18 different yogurt specimens of 14 brands from Beijing, Tianjin, Shanghai, Guangzhou and Shijiazhuang were determined by epithermal neutron activation analysis (ENAA), molecular activation analysis (MAA) and GC-Mass Spectrometry (GC-MS), respectively. The results indicated that the halogen in yogurt mainly existed as inorganic species and non-extractable organo-halogen compounds. About 1/3 to 1/4 of EOX was EPOX. Further, EOCl and EPOCl were the main organo-halogen species in yogurt. The average concentration of the unknown organo-chlorine was 96% of the EPOCl. HCHs and DDTs were still the main contaminants of OCPs in the yogurt of interest. Also, PCB202, PCB103 and PCB208 were the main contaminants of PCBs.  
        关键词：Molecular activation analysis (MAA);Gas chromatography-mass spectrometry (GC-MS);Yogurt;Organo-halogen compounds (OCs);Organo-chlorine pesticides (OCPs);Polychlorinated biphenyls (PCBs)   
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        发布时间：2021-03-12
      • LI Xiaodong YUAN Wangzhi ZHAO Zhenjie RUAN Jianzhong YANG Xielong
        Issue 10, (2004)
        摘要：In this paper, the M?ssbauer spectroscopy and other methods have been used to study giant magneto-impedance (GMI) effect of the FeCuNbSiB films following different temperature’s annealing. From as-deposited state to the sample annealed at 570 ℃, the magnetic moments of the films were orientated from the initial direction that was parallel to the film plane to the direction perpendicular to it, and later back. The GMI effect of the films varied with soft magnetic properties and magnetic moment’s orientation. When the orientation of moments was perpendicular to the film plane, the GMI ratio was decreased dramatically.  
        关键词：GMI effect;M?ssbauer spectra;Fe735Cu1Nb3Si135B9films;Magnetic moments   
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        发布时间：2021-03-12
      • XU Jiehua HU Ping LI Weiming LI Jieming LI Chunyi CHENG Muhua ZHANG Yong 1
        Issue 10, (2004)
        摘要：To develop a technique of one-day protocol of cerebral blood flow imaging with acetazolamide (ACZ) tablet stress and to discuss its clinic value, 99m Tc-ECD SPECT data of regional cerebral blood flow (rCBF) study before and after taking ACZ (2g, oral) were collected in one day on 30 patients diagnosed as ischemic cerebralvascular disease. The responses of cerebralvascula before and after stress were observed and the positive rates of rest, stress test and CT examination were compared. The results show that the responses of rCBF to ACZ can be devided into four patterns. The positive rate of CT, rest test and combined test is 23.3%, 26.7%, 86.7% respectively. The positive rate of combined test is higher than that of rest test (p<0.05) and CT (p<0.01). It is concluded that the one-day protocol ACZ tablet test is time-saving and economic, because it can improve positive rate in cerebral ischemia and provide the information of cerebrovascular reserve capacity.  
          
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        发布时间：2021-03-12
      • LIU Yuxia LIU Ning LIAO Jiali
        Issue 10, (2004)
        摘要：Nicotinic acetylcholine receptor (nAChRs) are involved in various pharmacological effects or disease states. In this paper, the progress of ligands for imaging nicotinic acetylcholine receptor (nChRs) is reviewed with 34 references. Additionally, its situation, problems and prospect are discussed.  
        关键词：Nicotinic acetylcholine receptor (nAChRs);Receptor;Ligand;Imaging;Radiosynthesis   
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        发布时间：2021-03-12
      • ZHANG Lixing
        Issue 10, (2004)
        摘要：The measurement technology for noble gases radioxenons and argon-37, which are important radionuclides for the verification of Comprehensive Nuclear Test-Ban Treaty, was introduced in this paper. The development of measurement systems for radioxenons and argon-37 was also described.  
        关键词：CTBT;IMS;OSI;Xenon;Argon-37   
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        发布时间：2021-03-12
      • DING Xunliang LIU Zhiguo YAN Yiming PAN Qiuli
        Issue 10, (2004)
        摘要：A new μ?XRF spectrometer, which consists of a monolithic polycapillary X-ray focusing lens and a plane crystal wavelength dispersive spectrometer using a position sensitive proportional counter (PSPC), is described. The polycapillary X-ray lens is used to collect X rays from a rotating Cu anode X-ray source and to focus them into an X-ray microbeam at its exit focus. By using the position sensitive detector, the wavelength dispersive spectrometer has the capability to simultaneously record a broad range X-ray spectrum without scanning procedure. The experimental results show that the minimum spot size of the X-ray beam focused by the lens is 50 μm for Cu Kα. The detectable energy range of the spectrometer in one run without scanning procedure is more than 800 eV. The energy resolution of the μ?XRF spectrometer is 4.4 eV for Ti Kα.  
        关键词：μ?XRF;Polycapillary X-ray lens;Position sensitive proportional counter;Wavelength dispersion;Energy dispersion   
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        发布时间：2021-03-12
      • ZHAO Kun LI Jianmin
        Issue 10, (2004)
        摘要：Based on dual-energy X-ray technology combined with forward-scattering, a brand new explosive detection method is presented. Dual-energy technology can give the information on the effective atomic number (Zeff) of an irradiated component, while the intensity of the forward scattered photons can reveal the density information according to our research. Therefore, the existence of the explosive can be effectively identified by combining these two characteristic quantities. Compared with the earlier inspection approaches, the new one has a series of particular advantages, such as high detection rate, low false alarm rate, automatic alarm and so forth. The project is ongoing.  
        关键词：Explosive detection;Dual-energy X-ray;Forward scattering   
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        发布时间：2021-03-12
      • YAO Ze’en CHEN Shangwen SU Tongling CAO Lei CHEN Qin
        Issue 10, (2004)
        摘要：A design of the rotating target system used in an intense neutron generator is described. By simulating the temperature of target disc, some operating parameters of the intense neutron generator are also obtained.  
        关键词：TiT target;Neutron generator;Temperature   
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        发布时间：2021-03-12
      • DAI Licao ZHANG Li HUANG Shudong
        Issue 10, (2004)
        摘要：Human reliability analysis (HRA) is a very important part of probability safety assessment (PSA) in a nuclear power plant. Qualitative analysis is the basis and starting point of HRA. The purpose, the principle, the method and the procedure of qualitative HRA are introduced. SGTR, a pressurized nuclear power plant as an example, is used to illustrate it.  
        关键词：HRA;Qualitative analysis;Procedure   
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        发布时间：2021-03-12
      • CHEN Shaohua1,2 XING Pifeng1 CHEN Wenmei2 LIU Jun1 1
        Issue 10, (2004)
        摘要：In order to prepare low cost, high hydrogen permeability, long runtime and high stress H-permselective membranes, the refractory metal zirconium (Zr) was selected as the membrane’s substrate. Using high temperature vacuum hydrogenation method ( at the vacuum of 4.0×10-4 Pa and 650 ℃), the surface oxide film of Zr was relaxed, decomposed and removed; then ZrH2 film was formed on the clean Zr surface at hydrogen atmosphere. At the vacuum of 6.6×10-6 Pa, a Pd film about 400 nm thick was deposited on each surface of the zirconium disk (φ 50 mm ×0.23 mm) by the method of ion sputtering plating. The Pd membrane is bright, fine and smooth. It is easy to control the Pd film thickness. Having been annealed, the Pd film adheres strongly to the Zr substrate, and the internal stress between the Pd and the Zr disappears. The composite membranes are compact and bright. The surfaces of the zirconium and the composite membrane were analyzed by XRD and XPS. These Pd-Zr H-permselective composite membranes will be vastly applicable to the purification of nuclear and fusion fuel and the distillation of tritium from breeder reactor.  
        关键词：Hydrogen purification;Composite membrane;High temperature vacuum;Hydrogenation   
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        发布时间：2021-03-12
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