最新刊期
      卷 0 ， 期 0 ， 2020
      • YAN Xiaohui TIAN Liang ZHANG Xinyi1
        Issue 1, (2004)
        摘要：For long time a lot of scientists have devoted to study how matter, such as water molecules and K+, Na+, Ca2+, Cl-ions, move through cell membranes and complete the matter exchange between the inside and outside of cells. Peter Agre discovered and characterized the first water channel protein in 1988 and Roderick MacKinnon elucidated the structural and mechanistic basis for ion channel function in 1998. These achievements have made it possible for us to "see" these exquisitely designed molecular machines in action at the atomic level. The Nobel Prize in Chemistry for 2003 is shared between these two scientists. In determining the high resolution 3D structure of these channels, the synchrotron X-ray diffraction plays an important role.  
        关键词：Synchrotron radiation;Water channel;Potassium ion channel;Three-dimensional structure;Membrane protein   
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        发布时间：2021-03-12
      • CHEN Qiang HU Zhongwen YU Xiaojiang GAO Jiafa WANG Qiuping
        Issue 1, (2004)
        摘要：A grating groove spacing measurement system is established and checked by a sample grating. By detailed error analysis and error sources control, small spacing variation of either plane or concave grating can be determined with accuracy of ΔN/N=2×10-4. It is an efficient grating spacing measurement tool for the variable spacing grating as well as the constant spacing grating at NSRL.  
        关键词：Variable spacing grating;Groove spacing;Measurement system   
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        发布时间：2021-03-12
      • LI Zhihong GONG Yanjun WU Dong SUN Yuhan HONG Xinguo WU Zhonghua WU Ziyu1
        Issue 1, (2004)
        摘要：Mesoporous silica has potential use in catalytic, adsorbent and separate applications. Hybridization with organic groups can improve the surface property of mesoporous silica. In this paper the small angle X-ray scattering technique using synchrotron radiation was used to study fractal structure of mesoporous materials. The results showed that these materials possess both surface fractal and pore fractal structure. Variation of fractal dimension with the material preparation condition was also discussed.  
        关键词：Mesoporous silica;Fractal;Small angle X-ray scattering   
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        发布时间：2021-03-12
      • WANG Fang WANG Guangwei1
        Issue 1, (2004)
        摘要：One set of low level control system was developed in the R&D stage of SSRF. It consists of a 500MHz signal generator, three feedback loops, an interlock and a protection system. This paper describes the design, commissioning and measurement results of this system, placing emphasis on the three feedback loops.  
        关键词：Low level;Feedback;Control loop   
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        发布时间：2021-03-12
      • HE Ming JIANG Songsheng JIANG Shan WU Shaoyong DIAO Lijun
        Issue 1, (2004)
        摘要：The half-life of 79Se has been measured using the projectile X-ray method in AMS (PX-AMS). A new half-life of 79Se, (2.80±0.36) ×10~5a is obtained with the direct measurement method. The half-life of 75Se is also obtained with the same method as that of 79Se. The measurement result of 75Se half-life shows that the result of 79Se half-life obtained with the PX-AMS method is reliable.  
        关键词：79Se;Half-life;PX-AMS   
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        发布时间：2021-03-12
      • LI Xiaolin ZHU Jieqing GUO Panlin WANG Jiqing LURongrong QIU Huiyuan LI Mingyao JIANG Da WANG Yongqi ZHOU Tao LI Yan ZHANG Guiling
        Issue 1, (2004)
        摘要：A new method combining the scanning nuclear microprobe (SNM) with the pattern recognition of artificial neural network (ANN) was studied for the source identification and apportionment of aerosol particles. A technique of preparing of single aerosol particle sample was developed. A multi-station and multi-parameter data system for SNM was set up. A ANN program package was used for the source identification and apportionment of aerosol particles based on the Micro-PIXE spectra. The new method was preliminarily applied to the PM10 aerosol particles in the atmosphere of Shanghai city.  
        关键词：Aerosol particle;Atmospheric particulate matter;Scanning nuclear microprobe;Artificial neural network;PM10   
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        发布时间：2021-03-12
      • PENG Dequan BAI Xinde ZHOU Qinggang CHEN Xiaowen YURenhong
        Issue 1, (2004)
        摘要：In order to study the influence of lanthanum ion implantation on the aqueous corrosion behavior of zirconium, specimens were implanted by lanthanum ions with a dose range from 1×1016 to 1×1017cm-2, using MAVVA source at an extracted voltage of 40 kV. The valence of the surface layer was confirmed by X-ray photoemission spectroscopy （XPS） . Three-sweep potentiodynamic polarization measurement was employed to evaluate the aqueous corrosion behavior of zirconium in a 0.5 mol/L H2SO4 solution. It was noted that a significant improvement was achieved in the aqueous corrosion resistance of zirconium implanted with lanthanum ions. The mechanism of the corrosion resistance improvement of the lanthanum-implanted zirconium was also discussed in this paper.  
        关键词：Zirconium;Corrosion resistance;Lanthanum ion implantation;Potentiodynamic scan using three electrodes;Potentiodynamic polarization   
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        发布时间：2021-03-12
      • LEI Yong GUO Baofa YUAN Sixun1
        Issue 1, (2004)
        摘要：Neutron activation analysis (NAA), in combination with multivariate analysis of the generated data, was used for the provenance study of the Terracotta Army of Qin Shihuang, the first Emperor of the first unified country of China. Using NAA, we measured the chemical composition of 30 shreds of the Terracotta Army and 29 clay samples from six resources in Lintong around Qin Shihuang Mausoleum. Although quite a few elements were determined, 8 elements were used for grouping the shreds and raw clay samples. By the statistical methods, some of clay samples close to the mausoleum present a chemical composition similar to that of the Terracotta Army, which hints these the raw clay resources were likely applied for the production of the Terracotta Army of Qin Shihuang.  
        关键词：Terracotta Army of Qin Shihuang;Provenance study;NAA;Factor analysis   
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        发布时间：2021-03-12
      • HE Xiaoping LI Hongyu WANG Haiyang SUN Jianfeng YANG Hailiang QIU Aici TANG Jumping LI Jingya1
        Issue 1, (2004)
        摘要：Structure of the biased charge collector for measuring HPIB is introduced in this paper. The inner charge propagation process of HPIB in the biased charge collector was simulated with KARAT PIC code. The simulation results indicated that charge was neutralized but current was not neutralized in the biased charge collector. The influence of biased voltage and aperture diameter were also simulated. A -800 V biased voltage can meet the requirement for measuring 500 keV HPIB, and this is consistent with the experimental results.  
        关键词：Biased charge collector;High power ion beams;KARAT code   
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        发布时间：2021-03-12
      • TIAN Yuxian WU Liping WANG Gang1
        Issue 1, (2004)
        摘要：A feasible nondestructive quantitative analysis method combining XRF primary measurement with Monte Carlo simulated calculation is advanced. Concentrations of lead in aerosol in Chengdu city were determined to be 1.24μg/m3, which had no distinct difference compared with 1.80μg/m3 provided by the relative references based on atomic absorption spectrum analysis. A relative efficiency curve of Si(Li) detector is drawn, and some factors that may affect the detector efficiency are discussed quantitatively.  
        关键词：X-ray fluorescence analysis;Monte Carlo method;Iteration method;Aerosol;Lead concentration   
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        发布时间：2021-03-12
      • ZHENG Qisen LI Binghai JIANG Guoyuan1
        Issue 1, (2004)
        摘要：This paper has presented a themoluminescence detection used in prospecting sandstone-type uranium deposits. A comparative study of the airborne γ-ray spectrometric survey and the thermoluminescence detection was carried out in a known area and an unknown area, It is found that the TL detection, used as a complemental measure in uranium exploration, is simple and easy to handle. When used in radioactive exploration in large overlaying areas, the technique can achieve a goal of "removing overlay and into depth", and post directly how the radioactive elements gathered and scattered in depth, thus showing its superiority.  
        关键词：Thermoluminescence;Sandstone-type uranium deposits;Airborne y-ray spectrometric survey;Overlaying areas   
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        发布时间：2021-03-12
      • JIA Bing ZHAO Huiyun DU Jin WANG Fan1
        Issue 1, (2004)
        摘要：188Re-MAG3, a potential radiopharmaceutical for restenosis treatment after PTCA, was prepared with commercially available TechneScan MAG3 kit. The labeling yield of 188Re-MAG3 was more than 98 % under the optimal labeling condition. The data revealed that stability of 188Re-MAG3 in reaction medium and in saline was better than in bovine serum. Compared to Na188ReO4, the blood clearance of 188Re-MAG3 was faster and the uptake in thyroid and stomach was lower. The radiolabeled compound was excreted rapidly through urinary system.188Re-MAG3 is promising for clinical trial instead of Na188ReO4.  
        关键词：PICA (Percutaneous transluminal coronary angioplasty);Coronary artery restenosis;Brachytherapy;188Re;Radiolabeling;MAG3   
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        发布时间：2021-03-12
      • LI Jing SHI Anjing MO Shangwu LIU Kewu ZHANG Huifang GAO Yankun1
        Issue 1, (2004)
        摘要：The effects of CuSO4 and pH on Ca2 + transmembrane influx and efflux of mantle in Anodonta woodiano paciflca Heuda were studied with the method of 45Ca transmembranes determination. The results showed that high-concentration of KCl solution had no effect on the Ca2 + flux in mantle epithelium; CuSO4 was proved to inhib-ite Ca metabolism significantly, for it could decrease the Ca2 + influx of mantle in the concentration dependent manner, and Ca2+ influx decreased markedly even in 1μg/g CuSO4 compared with the control. The Ca2+ influx showed stable in the pH of 3-9, while pH increased to 11, the Ca2+ influx decreased to 1/6 of the others. We also examined the Ca2 + efflux of mantle in shell in calm condition, the results proved that the radioactivity in mantle was decreased gradually during 0-80 min.  
        关键词：Anodonta woodiano paciflca Heuda;Ca2 + -transportation;pH;CuSO4   
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        发布时间：2021-03-12
      • SU Chenghai LI Qingru JIANG Yimin
        Issue 1, (2004)
        摘要：Objective: To explore the clinical value in the variation law and the relationships among BGP, CT, PTH-M and β2-MG in serum of 40 patients with CRF ante- and post-haemodialysis and BMD of them. Methods: The relationships among BGP, CT , PTH-M, β2-MG, AKP,BUN and Cr were analysed by testing their levels in serum of CRF patients with RIA; BMD of the lumbar spine in 19 of 40 patients with CRF was measured by dual-energy X-ray absorptiometry(DEXA). Results: The levels of BGP, CT, PTH-M, β2-MG, AKP, BUN and Cr in serum of patients with CRF were higher than that of the controls. And that of patients with CRF in post-hemodialysis was very lower than that of those in ante-hemodialysis .The level of β2-MG in serum of patients with CRF was positively correlated with that of BGP and CT respectively. BMD of 19/40 patients with CRF were higher than that of the controls. Conclusion: There is a significant clinical value in testing β2-MG, BGP, PTH-M and CT concentrations in serum for analysing patient’s condition, assessing the treatment effect and estimating prognosis of patients with CRF.  
        关键词：Hemodialysis;Bone Gla-protein (BGP);Calcitonin (CT);β2-microglobulin (β2-MG);Bone mineral density (BMD)   
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        发布时间：2021-03-12
      • ZHANG Yanmin AN Jigang ZHOU Liye XIANG Xincheng LIU Yisi WU Zhifang
        Issue 1, (2004)
        摘要：This paper presents a mobile 60Co container inspection system (CIS) and its performance. With all devices including industrial 60Co source, high sensitive gas-ionized array detector, image treatment and control system, inspection driving device on a vehicle, the vehicle mobile CIS has advantages of high agility and climate resistance, and it can complete emergent inspection. The mobile CIS contains equipment-vehicle and control-vehicle. Equipment-vehicle and object-container are still, while a folding detector gantry is moving through a folding rail on the equipment-vehicle and completes the inspection. The mobile CIS has the inspection characteristics similar to the fixed system and it can be used in worse circumstances. Its CI (Contrast Indicator) and IQI (Image Quality Indicator) for 100 mm steel plate attain to 0.5 % and 2.5 % respectively, and the SP (Space Penetration) is about 240 mm (Fe). Maximum dose per scanning is about 5 μ. Gy, scanning speed is varied from 6 to 18 m/min, and maximum transformational speed is 90 km/h.  
        关键词：Co;Container inspection system;Mobile   
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        发布时间：2021-03-12
      • GU Deshan QIAO Shuang JING Shiwei SANG Haifeng ZHANG Yongxiang LIU Yuren LIU Linmao
        Issue 1, (2004)
        摘要：Pulse fast thermal neutron analysis technology (PFTNA) is a better method than chemical analysis used in coal industry. An experimental system of pulse neutron coal industrial analyzer is designed in the Radiation Technology Institute of Northeast Normal University by exploiting BGO detector and 5×10~8/s pulse neutron generator. The mass precision of the system for element measurement is 0.5% (C), 0.4% (H), 7.0% (O), 5.9% (ash), respectively.  
        关键词：Pulse neutron generator;Coal;Industrial analysis;BGO detector   
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        发布时间：2021-03-12
      • QIAN Tianwei CHEN Fanrong Chen Jiajun Wu Guibin1
        Issue 1, (2004)
        摘要：The migration behavior of radionuclides in soil and groundwater has a great impact on safety of nuclear waste disposal. Usually, there are two kinds of models to study the migration behavior of radionuclides in soil and groundwater system at present: hydraulic model and geochemical model, As an important part of the geochemical model, the reaction path simulation method can be used to not only the material concentration of the system in equilibrium, but also the change process of the system from disequilibrium to equilibrium. In this paper, principle of the reaction path simulation and characteristic of program EQ3/6 are summarized. Then, with an example of CIRP’s field test site, the reaction path of Np and Pu in loess-groundwater system is simulated using program EQ3/6, and the chemical component variation of Np and Pu in the course of irreversible water-rock reaction reaching local equilibrium with the reaction process is investigated. A comparison is also presented between simulated and measured results.  
        关键词：Np;Pu;Reaction path simulation;Loess;Groundwater;EQ3/6   
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        发布时间：2021-03-12
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