最新刊期
      卷 0 ， 期 0 ， 2020
      • ZHU Haijun GUO Chunlong DING Jianguo LIU Yajuan
        Vol. 35, Issue 9, (2012)
        摘要：In this paper,we report the local monitor and control system of fault interlock based on software design of S7-200 and S7-300 according to characteristics of the B-PS & S-PS in storage ring of SSRF.The remote monitor and control system based on EPICS are presented.The system architecture and key technologies in hardware and software designs are expatiated.Advantages of the system include the friendly interface and simple operation.The system has been working stably.  
        关键词：EPICS;SSRF;Storage ring;Fault interlock;Monitor and control   
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        发布时间：2021-03-05
      • LIU Zhonghua BIAN Fenggang LI Yongping LI Xiuhong TIAN Feng
        Vol. 35, Issue 9, (2012)
        摘要：In this paper,an algorithm based on phase-space reconstruction and principal component analysis is used to locate the center-point of the SAXS\WAXS isotropic patterns.In the algorithm,the scattering patterns are scanned in the horizontal and vertical directions,and certain rows and columns of the patterns are extracted to improve the accuracy of the center positioning.The center of scattering patterns is decided with the perpendicular theorem of the circle.Compared with fit2d,experiment results shows the method is of good effectiveness.  
        关键词：Phase-space reconstruction;Principal component analysis;Center positioning of a circle;SAXS   
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        发布时间：2021-03-05
      • XIONG Yun1,2 LENG Yongbin1 YI Xing1,2 LAI Longwei1,2ZHANG Ning1,2 WANG Baopeng1,2 1
        Vol. 35, Issue 9, (2012)
        摘要：In this paper,we report our work on the method of data reliability assessment of the DC curreny transformer(DCCT) system of SSRF.In order to predict the true value of parameter of DCCT system,the Kalman filtering model for the DCCT system is established.Through statistical analysis of the DCCT data,the confidence threshold is defined,and real time confidence level of the DCCT data is provided with a computer code.In this way,availability of the DCCT system has been improved.  
        关键词：Data prediction algorithm;Kalman filter algorithm;DCCT;Confidence level algorithm   
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        发布时间：2021-03-05
      • WU Haibiao1 CAO Xingzhong2 WU Jianping1 CHENG Guodong1,2 LI Zhuoxin2 ZHANG Peng2 JIANG Xiaopan2 YU Runsheng2 WANG Baoyi2 1
        Vol. 35, Issue 9, (2012)
        摘要：The formation of Cu-rich precipitates and defects in reactor pressure vessel steels(RPVS) has been considered as a key factor to induce embrittlement,and been investigated extensively.In this study,scanning electron microscope(SEM) and the positron annihilation spectroscopy were used to study the effect of thermal cycles on the Cu-rich precipitates and defects.It was found show that the defects in Fe-1.5wt%Cu alloy recovered after 2 h high-vacuum annealing at 1 173 K,while part of the Cu atoms aggregated to form nano-particles,which attracted and captured thermal positrons.The SEM images showed that density of the Cu nano-particles reduced with increasing annealing temperatures,demonstrated by changes in the W parameters.It was also found that the alloy still contained a small amount of Cu nano-particles even at annealing temperature of 1 473 K.  
        关键词：Fe-Cu alloy;Defect;Cu nano-particle;Positron annihilation   
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        发布时间：2021-03-05
      • ZHANG Jinzhao1 TUO Xianguo1,2 LI Zhe1 LIU Chunlai1 1
        Vol. 35, Issue 9, (2012)
        摘要：In an accident of neutron radiation,the neutron dose can be estimated by measuring radioactivity of 24Na in blood of the patients.In this work,NaCl solution as simulated blood was irradiated by a 252Cf neutron source,and measured by a low background γ-ray measurement system.The 24Na activity was measured at different source-sample distances for different irradiation hours.The 24Na activity after decay correction decreases exponentially with increasing distance,but increases linearly with irradiation time.  
          
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        发布时间：2021-03-05
      • TIAN Shihai1,2 LU Yan1,2 WANG Heyi1 CHEN Xu2 YUAN Yonggang1 1
        Vol. 35, Issue 9, (2012)
        摘要：The measurement of neutron dose equivalent has been a widespread need in industry and research.In this paper,aimed at improving the accuracy of neutron dose equivalent meter,a neutron dose counter is simulated with MCNP5,and the energy response curve is optimized.The results show that the energy response factor is from 0.2 to 1.8 for neutrons in the energy range of 2.53×10–8 MeV to 10 MeV.Compared with other related meters,it turns that the design of this meter is right.  
        关键词：Dose equivalent;Energy response;Response Factor   
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        发布时间：2021-03-05
      • DENG Xiaoying1 TUO Xianguo1,2 WANG Xunlai1 LENG Yangchun1 LI Zhe1 1
        Vol. 35, Issue 9, (2012)
        摘要：Adsorption behavior of 239Pu by Gaomiaozi bentonite as a function of the factors of aqueous phase pH value,239Pu initial concentration and ionic species is studied by static adsorption experiments in this paper.The following results are obtained.Adsorption equilibrium time of 239Pu by Gaomiaozi bentonite samples is about 24 h,and the adsorption distribution ratio Kd value of 239Pu increases with the pH value,but decreases with increasing initial concentration of 239Pu.And adsorption of 239Pu by bentonite samples with different ionic species show that anions affect the most on adsorption of bentonite is CO32–,followed by HCO3–and SO42–,whereas Cl–and NO3–hardly have any influence on the adsorption of bentonite.  
        关键词：239Pu;Bentonite;Adsorption behavior;Radionuclide migration   
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        发布时间：2021-03-05
      • Jingjing MA Min ZHAO Liang JI
        Vol. 35, Issue 9, (2012)
        摘要：In the context of computed tomography (CT),a key techniques is the image reconstruction from projection data. The filtered back projection (FBP) algorithm is commonly used in image reconstruction. Based on cause analysis of the artifacts,we propose a new image reconstruction algorithm combining the Wiener filter and FBP algorithm. The conventional FBP image reconstruction algorithm is improved by adopting Wiener filter,and artifacts in the reconstructed images are obviously reduced. Experimental results of typical flow regimes show that the improved algorithm can effectively improve the image quality.  
        关键词：Computed tomography;Image reconstruction;Filtered back projection;Wiener filtering;Artifact   
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        发布时间：2021-03-05
      • ZHAO Yongfu1,3 ZHENG Zheng1,2 ZHENG Binguo1 WANG Changbao3 LI Lili3 1
        Vol. 35, Issue 9, (2012)
        摘要：Phthalic acid esters(PAEs) belong to environmental endocrine disruptor.The dimethyl phthalate(DMP),diethyl phthalate(DEP) and di-n-butyl phthalate(DBP) were selected for the radiation study.The removal efficiencies of DMP,DEP and DBP in drinking water by gamma-ray irradiation are discussed.The results show that these PAEs could be efficiently removed by gamma-ray irradiation.The removal efficiencies of DMP,DEP and DBP(12 mg/L) in aqueous solutions by 0.8 kGy gamma-ray treatment were 96.6%,94.5% and 86.2%.The absorbed dose needed for the removal of total carbon in aqueous solutions was much larger than the doses for PAEs degradation.When 2 kGy was selected,the removal efficiencies of TC for DMP,DEP and DBP were only 23.6%,14.3% and 12.9%.The study results also show that the radiation degradation reaction of PAEs should be divided into two stages: low dose addition reaction and high dose ring-opening reaction.This study is of significance in the disposal of micro-polluted drinking water.  
        关键词：Phthalic acid esters(PAEs);Drinking water;Irradiation;Removal   
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        发布时间：2021-03-05
      • SHEN Huifang LI Guozhu
        Vol. 35, Issue 9, (2012)
        摘要：Dry seeds of three kinds of adzuki beans(Jinhong1,Jihong9218,and Jingnong6) were irradiated by 60Co γ-rays to 100,200,300,400,500 and 600 Gy.The radiation effects on seedlings were analyzed to estimate the optimum dose,which was 400 to 600 Gy,based on the average half lethal dose(LD50) of 473.3 Gy for the three kinds of adzuki beans.The M1 γ-ray mutagenic effects were studied by farming the three kinds of adzuki beans irradiated to 350,500 and 650 Gy.It was found that the beans treated with higher doses had obvious inhibition on germination rate,seedling development,with significant or very significant difference compared with the CK.There was significantly negative correlation between seedling emergences,seedling height and doses.Irradiation affected mature plants by reducing plant height,decreasing nodes number of main stem,pods number per plant,seeds per pod and shortening pod length with significant.The order of radio-sensitivity to γ-rays was as follows: Jinhong1,Jihong9218,and Jingnong6.  
        关键词：Adzuki bean;60Co γ-rays;Optimum dose;Mutagenic effects   
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        发布时间：2021-03-05
      • XUE Yuxiong1 YANG Shengsheng1 Chen Luojing1 CAO Zhou1 BA Dedong1 AN Heng1 GUO Gang3 1
        Vol. 35, Issue 9, (2012)
        摘要：Radiation effects on avionics microelectronics are important reliability issues for many space applications.In particular,single-event latchup(SEL) phenomenon is a major threat to CMOS integrated circuits in space systems.To effectively circumvent the failure,it is important to know the behavior of such devices during latchup.In this paper,the mechanisms for SEL in CMOS devices are investigated.Several microelectronic devices used in avionics are tested using heavy ion beams,pulsed laser and 252Cf source.Based on the SEL test results,SEL-hardening and monitoring methods for preventing SEL from the systems design level are proposed.  
        关键词：CMOS devices;Single-event latchup;Simulation test;Hardening design methods   
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        发布时间：2021-03-05
      • YAN Yihua1 FAN Ruyu1,2 GUO Xiaoqiang2 LIN Dongsheng2 GUO Hongxia2 ZHANG Fengqi2 CHEN Wei2 1
        Vol. 35, Issue 9, (2012)
        摘要：The localized dose deposited around the track of a heavy ion can be high enough to induce a permanent failure in the semiconductor devices,such as the stuck bit error or functional failure.In this paper,progresses in studies on microdose effect are reviewed.Two basic failure mechanisms,i.e.the localized total dose effect and the strong coulomb repulsive force effect,are discussed.Typical failure modes in several types of devices,and the main impact factors,are discussed,too.  
        关键词：Microdose effect;Localized total dose;Heavy ion irradiation;Stuck bit   
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        发布时间：2021-03-05
      • DAI Jianxing ZHANG Huanqi LI Qingnuan WU Guozhong
        Vol. 35, Issue 9, (2012)
        摘要：High temperature fluoride volatility method(FVM) is a pyroprocessing technique for separation and recovery of high-purity uranium.However,it is not well developed in the field of spent fuel reprocessing due to tough requirements on equipment and materials for high temperature fluorination.In this paper,the feasibility of replacing F2 by NF3,which is less corrosive,is investigated emphatically by comparing the reaction enthalpy and the equilibrium constant for different fluorinating agents with U compounds.The results show that the NF3 as an alternative agent is feasible in thermodynamics;and the exothermic enthalpy of reaction does not bring drastic changes in temperature.  
        关键词：Uranium;High temperature chemistry;Fluorination reaction;Thermodynamics;NF3   
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        发布时间：2021-03-05
      • ZHANG Jinming1 ZHU Hong2 ZHANG Xiaojun1 WANG Hui1 LIU Xi3 LIU Jian1 ZHOU Naikang3 TIAN Jiahe1 1
        Vol. 35, Issue 9, (2012)
        摘要：Gefitinib is an approved anticancer drug inhibiting epidermal growth factor receptor/tyrosine kinase(EGFR/TK) in non-small cell lung cancer(NSCLC).In this work,we aimed at developing an auto-synthesis method for 11C-Gefitinib with 11C-CH3-Triflate as methylation agent,and evaluating 11C-Gefinitib to explore its specific uptake with micro PET imaging.11C-Gefitinib was synthesized by the reaction of 7-demethyl precursor with 11C-CH3-Triflate under base condition,and purified by HPLC.Micro PET/CT imaging was performed in A549 tumor-bearing mice.The results showed that it took 28 min for synthesis of 11C-Gefitinib with radiochemical yields of 30%-35%(with decay correction,n>5).The radiochemical purity was over 99%,and the specific activity was 55.5 GBq/μmol,respectively.Micro PET/CT imaging showed that the A549 tumor uptake of 11C-Gefitinib could be blocked by co-injection of non-radioactive Gefitinib(50 mg/kg),demonstrating the tumor specific accumulation of 11C-Gefitinib.It is concluded that 11C-Gefitinib can be served as PET imaging agent for the evaluation of Gefinitib therapy in NSCLC.  
          
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        发布时间：2021-03-05
      • CHEN Haojun WU Hua
        Vol. 35, Issue 9, (2012)
        摘要：Tumor angiogenesis is critical in the growth,invasion and metastasis of malignant tumors.The integrins,which express on many types of tumor cells and activated vascular endothelial cells,play an important role in regulation of the tumor angiogenesis.RGD peptide,which contains Arg-Gly-Asp sequence,binds specifically to integrin αvβ3.Therefore,the radiolabeled RGD peptides may have broad application prospects in radionuclide imaging and therapy.Major research interests include the selection of radionuclides,modification and improvement of RGD structures.In this article,we give a review on research progresses in optimization strategy for radiolabeled molecular probes targeting integrin αvβ3.  
        关键词：Integrin;RGD peptide;Molecular probe   
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        发布时间：2021-03-05
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