最新刊期
      卷 0 ， 期 0 ， 2020
      • YU Chenghao WU Guanyuan DU Hanwen ZHAO Yan CAO Yun
        Issue 11, (2006)
        摘要：The picosecond linear accelerator was aligned by the micro-collimator, while the femtosecond one by the laser tracker mainly. In respect of accuracy, efficiency and cost, the merit of the laser tracker technology can be obviously seen.  
        关键词：Linear accelerator;Laser tracker;Alignment;Survey;Accuracy   
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        发布时间：2021-03-12
      • HU Yong1,2 ZHENG Lifang1 LI Jitang1,2 LIU Songqiang1 1
        Issue 11, (2006)
        摘要：This paper describes the establishment of a ControlLogix PLC system under EPICS environment. The implementation of ControlLogix EtherNet/IP driver for EPICS and its layers are discussed. Solution for the deficiency of the EPICS driver is presented. Results of the EtherNet/IP testing show that the system which uses EtherNet/IP has good performance in regard to speed, stability and reliability.  
        关键词：EtherNet/IP;EPICS;Industrial Ethernet;Common Industrial Protocol   
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        发布时间：2021-03-12
      • GUO Yuxian WANG Jie WANG Feng XU Pengshou YAN Wensheng
        Issue 11, (2006)
        摘要：In measuring X-ray magnetic circular dichroism spectra by the sample current mode, signal currents are strongly affected by external fields. Aiming at the design of rotatable electromagnet inside the vacuum chamber, we have designed and installed a piece of gold mesh attached to magnetic poles to increase the sample current signals, and found that sample currents increase rapidly and tend to saturation with increasing bias in different magnetic fields. The stronger the external field is applied, the higher bias voltage is required to reach signal saturation. Comparing absorption spectra of an oxidated aluminum foil with a CoFe film in parallel and antiparallel magnetization under the same magnetic field and bias, we have found that the systematic error caused by adding magnetic field and bias is 2.17% of MCD intensity for cobalt, which indicates that the developed technique has some advantages to measure XMCD spectra.  
        关键词：X-ray magnetic circular dichroism (XMCD);Total electron yield;External field;Bias;Asymmetric ef- fect   
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        发布时间：2021-03-12
      • CUI Guoshi1,3 ZHAO Hongying2,3 SHEN Xinyuan1 1
        Issue 11, (2006)
        摘要：In this paper, the synthesis of nano-Ag-PVA-H2O sol was described. The nanosilver particles were observed by AFM and TEM. The average diameter of the nanosilver particles was about 24nm (AFM) and 22.6nm (TEM) respectively. The optical absorption property of nano Ag-PVA-H2O sol was researched. Comparing with the value reported by literature, the absorption peak of 403.5 nm presents a 33.5nm red-shift and the absorption line is broadened. The results were analyzed and discussed.  
        关键词：Nanosilver;Sol;Radiation;Synthesis;Optical absorption   
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        发布时间：2021-03-12
      • YANG Xiaojun1 LIN Min2 YANG Zhimin1 DU Jun 1 1
        Issue 11, (2006)
        摘要：The shielding effects of several shielding materials to be used in space radiation environment are simulated by MULASSIS radiation analysis tool. And the components of the shielding materials are suggested according to the simulation results. The influence of components on the shielding effects of metal/polymer composites is discussed on the basis of experiment results for the middle energy electron beam irradiations.  
        关键词：Space radiation;Shielding effect;Composites   
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        发布时间：2021-03-12
      • YUAN Yuan2 LI Shihong1 ZHANG Dongzheng3 HE Ming 1 DONG Kejun1 ZHANG Genfa4 JIANG Shan1 1
        Issue 11, (2006)
        摘要：The PC12 cells were traced by 41Ca and the final biological sample, CaF2, was measured by Accelerator Mass Spectrometry (AMS). The results were analyzed from two aspects: the time effect of glutamate on free calcium in PC12 cells;and the blocking effect of antagonist, MK-801, on receptor operated channel (ROC). Comparing with the results detected by laser scanning confocal microscope (LSCM), the results show that 41Ca AMS measurement can be used for detecting the change of calcium influx in PC12 cells effectively in different situations.  
        关键词：41Ca;Accelerator mass spectrometry (AMS);Laser scanning confocal microscope (LSCM);PC12 cell;Glutamate;MK-801   
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        发布时间：2021-03-12
      • HUANG Heqiao 1,2 WEI Mingjian 2 1
        Issue 11, (2006)
        摘要：The response of 375℃ thermoluminescence (TL) peak of quartz to radiation can be changed. It is varied with the radiation dose accepted from the environment by the crystal. Therefore, it must be calibrated in any experiment for quartz’s TL either as dosimeter or as TL dating. There are some data to explain this phenomenon in the present paper.  
        关键词：Thermoluminescence peak;Electron trap;Sensitivity   
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        发布时间：2021-03-12
      • ZHANG Fengbao1 YANG Mingyi1,2 LIU Puling1,2 TIAN Junliang1,2 1
        Issue 11, (2006)
        摘要：The cosmogenic 7Be is a better tracer in tracing particles movement, and has been applied to study soil erosion. But the study that the cosmogenic 7Be is imbibed and intercepted by the cover materials on the soil surface is relatively less, which leads to a direct impact on the accuracy of the tracing results,the establishment and application of the tracing models. In this paper, the cosmogenic 7Be content of different cover materials on the soil surface was analyzed, the results showed that the withered plant cover contained the highest 7Be activity among the incomplete decomposed and the living plant cover in the end of springtime. For the living plant, the cumulative value of 7Be con- tent increased gradually in their whole life, obviously in the fall. In addition, the 7Be contents in different plant spe- cies were analyzed statistically, the results indicated that different plants contained different 7Be contents and the variation coefficient was about 0.6 among the plants. The trend of the average 7Be content in different plants was the herbage >the half-shrub and shrub>the crop. But compared with other species, the variation coefficient of 7Be in dif- ferent crops changed greatly with about 0.47.  
        关键词：7Be;Radionuclide;Plant cover materials;Loess plateaus   
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        发布时间：2021-03-12
      • ZHANG Xiaodong1 LI Gongping1 ZHANG Limin1 YOU Wei1 ZHANG Yu1 LIU Zhengmin1 LIN Dexu2 1
        Issue 11, (2006)
        摘要：The n-type gallium nitride (GaN) films were implanted with oxygen, nitrogen, magnesium, silicon and gallium ions at room temperature to a dose range from 1013 to 1016 cm-2. All the implanted GaN samples were annealed at 900℃ for 10 min in a flowing nitrogen environment. The effects of the implanted ion species on the blue luminescence (BL) band of GaN material were investigated by the photoluminescence (PL) spectra taken at room temperature. And based on the experimental data, we can conclude that the BL band result from the transitions between the energy levels formed by the interstitial impurities in the band gap of GaN.  
        关键词：Gallium nitride;Photoluminescence spectra;Ion implantation   
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        发布时间：2021-03-12
      • LIU Changjiang LI Long GAO Jianqing XU Sumei CHEN Linna ZHOU Jianming
        Issue 11, (2006)
        摘要：To investigate the therapeutic effect through long-term visit and analyze the affecting factors of cure rate after iodine-131 therapy for hyperthyroidism, a long-term follow-up has been undertaken for the patients with hyper- thyroidism after iodine-131 treatment. The following results have been obtained. (1)The cure rate of iodine-131 ther- apy for hyperthyroidism is 74.4%, and the incidence of permanent hypothyroidism is 7.5%. (2)There is no significant difference in the cure rate and incidence of hypothyroidism between the groups of male and female or “not take ATD” and “ATD withdrawn longer than 2 weeks” (P>0.05). (3) The difference of the cure rate among the groups of the courses of disease <1 a, 1―3 a and >3 a are significant (P<0.05), but there is no significance in the incidence of hy- pothyroidism. (4)The differences of the cure rate and the incidence of hypothyroidism between the groups of <40 a old and ≥40 a old or among the groups of thyroid mass <40g, 40―55g and >55g are significant (P<0.05). (5) The transferring rate of early hypothyroidism and late hypothyroidism to permanent hyothyroidism is 31.7% and 76.9% respectively. Permanent hypothyroidism easily happens for younger patients (P<0.05), but there is no difference in the peak uptake iodine-131 rate between patients with and without permanent hypothyroidism (P>0.05). The course of disease, age and thyroid mass are the major fators which influence the cure rate. Meanwhile, age and thyroid mass are the major fators which influence the incidence of hypothyroidism. To get high cure rate, the patients with hyperthy- roidism should be treated with iodine-131 as early as possible. In the meantime, the incidence of permanent hypothy- roidism must be paid attention to.  
        关键词：Iodine-131;Hyperthyroidism;Therapeutic effect;Long-term follow-up;Anti-thyroid drug(ATD)   
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        发布时间：2021-03-12
      • BING Tao1,2 DANG Bingrong1 XIE Yi1,2 QIU Rong1 LI Wenjian1 JING Xigang1,2 LI Qiang1 HU Qingrong3 GAO Bo3 ZHANG Yongdong3 LIANG Tao3 LI Dexing3 1
        Issue 11, (2006)
        摘要：The heads of the BALB/c mice were irradiated with 0, 0.5, 1, 2, 4 or 10 Gy of 12 C 6+ ions (80MeV/ u) and then the cell cycle distribution was analyzed by flow cytometry. At 36 h after irradiation, the G1/G0 phase cells were arrested significantly (P<0.05) with the increase of irradiated dose, while the G2/M phase cells were reduced markedly (P<0.05). After whole head irradiation (WHI) with heavy ions, the bone marrow cell cycle distribution of mice had significant changes, which indicates that ionization radiation may have an indirect effect on the bone marrow cell cycle distribution.  
        关键词：Heavy ion irradiation;Bone marrow;Cell cycle distribution   
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        发布时间：2021-03-12
      • CHEN Lixin1,2 YOU Rian2 FAN Wei1 GAN Feng1,2 LIU Xiaowei1 1
        Issue 11, (2006)
        摘要：The calculation of three dimensional dose distributions of radionuclide therapy based on the voxel S val- ues is very important in the nuclear medicine domain. 153Sm is one of the nuclides often used for bone metastasis therapy. The S values of 153Sm in different conditions were calculated based on the program of 3D voxel dose calcula- tion built on the Monte Carlo package EGS4. The influences of both material composition and density on the S value were discussed. It is shown that there are obvious influences of material densities on the S value, and while the den- sity is the same, there are fewer influences of material composition on the S value. The calculation could give some help to the 3D voxel dose calculations for radionuclide therapy. The work also indicated the ranges of error of the S values while disregarding the influence of material density and compositions.  
        关键词：S values;Monte Carlo simulation;Radionuclide therapy   
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        发布时间：2021-03-12
      • ZHOU Haixiang
        Issue 11, (2006)
        摘要：The hardware and software design characters of the automatic power controller (APC) in Tianwan NPP are introduced. According to the analysis of the principle and function of the system, both availability and reliability of APC in Tianwan NPP are proved. The paper also supplies some methods on how to design the digital APC system.  
        关键词：Automatic power controller;Hardware;Software;System function realization;Nuclear power plant   
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        发布时间：2021-03-12
      • ZHANG Kaichun1 WU Liping2 YAO Jun3 ZHU Dajun1 1
        Issue 11, (2006)
        摘要：The X-fluorescence analysis technique was introduced to measure the trace elements in archeological ceramic fragment samples. Production areas of the samples were expected to be properly and intelligently identified according to the differences in both element’s types and contents in samples. Aiming at the difficulties in spectrum analysis of the multi-element co-existence samples and in low count rates, the method of artificial neural network (ANN) was adopted to learn and identify the X-fluorescence spectra of samples. The total number of samples is 48 from 8 provinces and 20 gathering areas. Two kinds of structures of ANN are introduced to train and identify ceramic fragments in two classes of area domain, respectively. The correct rate of recognition was up to 100% for the samples whose production areas were accurately classified, while the rate was more than 60% for others. The recognition results of the method are satisfying.  
        关键词：X-fluorescence spectrum;Artificial neural network (ANN);Archeological ceramic fragments;Production area recognition   
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        发布时间：2021-03-12
      • QIAN Dongbin1,2 MA Xinwen1 ZHAO Zhizheng1 WANG Yanyu1 GUO Yuhui1,2 ZU Kailing1 ZHANG Dacheng1,2 1
        Issue 11, (2006)
        摘要：A CAMAC data acquisition system for measuring ionization cross section in laser multi-step resonant ionization experiment is described. The number of scalers in the front-end CAMAC can be adjusted by changing the data read-out table files. Both continuous and manual acquisition models are available, and there is a wide adjustable range from 1ms to 800 s with the acquisition time unit. The long-term stability, △t/t, for the data acquisition system with an acquisition time unit of 100 s was measured to be better than ±0.01%, thus validating its reliability in long-term online experimental data acquisition. The time response curves for three electrothermal power-meters were also measured by this DAQ system.  
        关键词：CAMAC;Data acquisition (DAQ);Microprocessor-GTBC;Multiple scales;Clock generator   
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        发布时间：2021-03-12
      • XIA Xiulong LUO Yangming FU Zhonghua LIU Jun WANG Heyi
        Issue 11, (2006)
        摘要：This paper comprehensively studies the influence of the gas velocity, temperature and feeding point on the mass transfer coefficient. Experiment results are as follows: (1) The mass transfer coefficient increases linearly when the gas velocity increases from 2 to 9 cm?s-1, and it reaches a high value between 40 mol?m-3?s-1 and 60 mol?m-3?s-1 when the gas velocity increases from 20 to 90 cm?s-1. Therefore, it might be an effective way to improve the mass transfer coefficient by increasing the gas velocity. (2) The mass transfer coefficient of the enriching section sharply decreases when the feeding point moves lower. In experiments, the vapor plays a very important role in the catalytic exchange process. (3) The operating temperature should be near 45℃.  
        关键词：Hydrophobic catalyst;Hydrogen isotopes;Tritium   
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        发布时间：2021-03-12
      • WANG Xiaoying1 REN Dapeng1 YANG Jianxiong2 JIANG Guifen2 1
        Issue 11, (2006)
        摘要：The microstructures and the crack propagation of uranium-niobium alloys near hypoeutectoid composition aged at temperature 200℃ for 2 hours during a tension was investigated by means of in situ tension tests using TEM. The results show that the twinning planes inside and between the martensite laths move and merge, and then disintegrate in uranium-niobium alloys with monoclinic α′′ structure during the tension. The crack propagation can be described as follows. Under the tension, the thinning zone which is locally plastically deformed emerges in the front of the crack tip. After the process of nucleation, growth and conjunction, the microvoids connect with the main crack, which results in the fracture. Neither of emission, propagation and movement of dislocation was observed during the tension.  
        关键词：Uranium niobium alloys near hypoeutectoid composition;In situ tension;Fracture;Transmission elec- tron microscopy   
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        发布时间：2021-03-12
      • XIA Liangshu CHEN Zhongqing
        Issue 11, (2006)
        摘要：Experiments of the aeration treatment of uranium-contained wastewater by saccharomyces cere- visiae-activated sludge were carried out. The experimental results indicate that, saccharomyces cerevisiae (S.C) can accumulate UO22+ effectively from aqueous solution: the removal ratio of 100 mg?L-1 UO22+ is 78.2% when S.C dos- age is 10 g?L-1, while with 8 g?L-1 activated sludge (A.S.) added in the solution the ratio has increased to 96.3%; then, 5―10 min effluent settling is clarified as a result of sludge flocculation; the optimum conditions of biosorption of U from wastewater by S.C.-A.S. are at pH 5, A.S concentration=8 g?L-1, added dry weight of S.C. =10 g?L-1, granularity of S.C=100―120mesh; the quantity of U increases with the enhanced initial concentration of UO22+ in the process of biosorption by S.C.-A.S., but the removal ratio deceases. The uptake of U could be described by the Freundlich and the Langmuir adsorption isotherms, which demonstrated that the adsorption was regarded as a physical adsorption.  
        关键词：Saccharomyces cerevisiae;Activated sludge;Uranium;Biosorption   
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        发布时间：2021-03-12
      • CHEN Shihe MA Shengrong ZOU Wenjie
        Issue 11, (2006)
        摘要：Generally, there are two methods for rock-crushing, namely by using mechanical energy or heat energy. The heat energy method has been applied widely in many fields. Especially, the piercing jet in excavating rock materials has been used widely in many mines. For the sake of practical applications, we have mainly introduced the method and principle of crushing and drilling rocks by low temperature plasma, as well as the structure and characters of a plasma device.  
        关键词：Low temperature;Plasma;Crushing;Rocks   
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        发布时间：2021-03-12
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