最新刊期
      卷 0 ， 期 0 ， 2020
      • HONG Xinguo1 INUI Masanori2 TAMURA Kozaburo3 1
        Issue 4, (2003)
        摘要：Liquid Se, well-known as a typical semiconductor, undergoes semiconductor-to-metal (SC-M) transition at high temperature and pressure in the vicinity of the critical point. To understand such peculiar electronic and atomic structures of liquid Se, we have performed energy-dispersive X-ray diffraction measurements (EDXD) and small angle X-ray scattering (SAXS) using synchrotron radiation at SPring-8 for fluid Se, including liquid and dense vapour regions. The obtained structure factors, S(k), and the pair distribution functions, g(r), are with good accuracy by using a new high pressure vessel with 7 scattering windows. Besides confirming the preservation of twofold coordinated structure and the contraction of the nearest coordination distance in the metallic fluid region, it was found that the value of the first minimum in the g(r) increases obviously with increasing metallic properties, indicating the interaction enhancement of interchain in fluid Se. The SAXS experiment shows that the density fluctuation plays an important role in the formation of Se chain or Se dimer.  
        关键词：Synchrotron radiation;High-temperature high-pressure fluid;Structural analysis;X-ray diffraction;X-ray scattering   
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        发布时间：2021-03-12
      • WANG Guicheng WANG Junhua JIANG Daoman GUAN Changying
        Issue 4, (2003)
        摘要：A new BPM calibration system has been developed in the National Synchrotron Radiation Laboratory (NSRL). Eight sets of BPM which will be used in Phase-II Project of Hefei Light Source (HLS) have been calibrated with this system. The experimental results are also provided in this paper.  
        关键词：BPM calibration system;Mapping;Vacuum pipe   
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        发布时间：2021-03-12
      • GONG Ke TANG Chuanxiang
        Issue 4, (2003)
        摘要：The principle of a fault diagnosis system for accelerators is introduced in this paper. The system picks up noise signals from accelerators, and uses neural network to diagnose whether the accelerators have problems during its operation or not. The analysis results of the noise signals from a linear standing wave accelerator are given using the system presented here.  
        关键词：Fault diagnosis;Accelerators;Neural network   
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        发布时间：2021-03-12
      • YUAN Renxian
        Issue 4, (2003)
        摘要：A method for optimizing the design of beam position monitors (BPM) is described. The finite element method was used to calculate the induced charge produced on four-button electrodes of the BPM. The normalization coefficient could be calculated from this induced signal according to the least square method. Then the design of BPMs with different capabilities was carried out.  
        关键词：Beam position monitor;Finite element method;Least square method   
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        发布时间：2021-03-12
      • FAN Kuanjun FENG Guangyao WANG Xiangqi PEI Yuanji ZHAO Feng
        Issue 4, (2003)
        摘要：In HLS (Hefei synchrotron Light Source), some experimental stations need SR pulse with long interval, which far exceeds HLS can provide now. In order to satisfy their needs, we proposed a scheme of using local vertical bump to lengthen the interval of SR pulses. We have designed a fast kicker magnet system, in which the pulse modulator is designed based on PFL technology and the kicker is an air-core kicker magnet. Preliminary measurements denote that the kicker system can meet the requirements of design.  
        关键词：Synchrotron;Interval;Local bump;Kicker magnet   
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        发布时间：2021-03-12
      • LU Xiuqin FU Changbo ZHANG Xin GUO Jiyu ZHAO Kui
        Issue 4, (2003)
        摘要：Experimental testing technique of heavy ion induced single event upset (SEU) has been developed at HI-13 tandem accelerator. Monoenergetic heavy ions, well-distributed and with weak enough intensity, were obtained by using Q3D magnetic spectrometer. The irradiation ions were monitored and measured by a semiconductor detector located in the scattering chamber and a position sensitive semiconductor detector located at the focal plane of the Q3D spectrometer. Curves of SEU cross section versus linear energy transfer (LET) have been measured with eight kinds of ions for some SRAM devices. Predictions of SEU rates have been derived from the test data coupled with models of heavy ion and proton environment and models of the interaction of ions with microelectronic devices.  
        关键词：Tandem accelerator;Single event effect;Linear energy transfer   
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        发布时间：2021-03-12
      • ZHU Jun WANG Shaojie
        Issue 4, (2003)
        摘要：The effect of temperature of the hydrothermal modification on the structure of Rare-earth Y zeolite (REY) was studied by positron annihilation spectroscopy. We measured the positron lifetime spectrum as a function of the temperature (300-800℃) of one hour hydrothermal modification for the REY zeolite after through pre-heated dehy-dration at 150℃. All lifetime spectra could be resolved into five components. The fifth lifetime component and its in-tensity were found to be related to the size and number of the secondary pores. The experimental results showed that the secondary pore in REY zeolite was produced by hydrothermal modification in some temperature range, and the largest size and the greatest quantity of the secondary pores were observed in the sample treated at 500℃ for 1 hour. The effect of hydrothermal modification on REY zeolite without pre-heated dehydration was also discussed.  
        关键词：Positron annihilation spectroscopy;Hydrothermal modification;Zeolite;Secondary pore   
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        发布时间：2021-03-12
      • WU Dawei ZENG Zhaoyuan LIU Chuansheng ZHANG Youzhen PENG Yougui FANG Xiangjun
        Issue 4, (2003)
        摘要：By combination of DC reaction magnetron sputtering with multiple arc-plating, the superhard coating is deposited onto HSS. X-ray diffraction (XRD) shows that the compound film exists in the form of hard crystalline phase. Microhardness HV of the compound film is 50.5—54.1GPa, and adhesive force to the HSS base (critical load) measured, by scratch test, to be 40—80N. It is proved that the coating has a very high wear resistance and the cutting life of the TiN coated cutting tools is great improved.  
        关键词：C3N4;Superhard thin film;HSS;Coated cutting tools   
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        发布时间：2021-03-12
      • LING Daijun CAO Jinxiang
        Issue 4, (2003)
        摘要：A special cell morphology, cavity-like cells, was found in posterities of Saccharomyces cerevisiae treated by low-temperature air plasma with different powers. The feature of the special morphology indicates that the cavity-like cells may be formed by cellular mutation effect induced by the plasma, instead of direct cellular damage by the plasma. The results suggest that the cellular mutation effect of the low-temperature plasma is a complex process.  
        关键词：Low-temperature plasma;Saccharomyces cerevisiae;Mutation;Morphology   
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        发布时间：2021-03-12
      • Erkin YAN Rongliang YU Xuefeng GUO Qi LU Wu REN Diyuan
        Issue 4, (2003)
        摘要：The radiation effects of the home-made high-speed CMOS circuits 54HCT244 have been studied. The results indicated that the degenerations of delay time TPHL under low dose rate is more seriously than that under high dose rate for the radiation-hardened devices. It is also shown that the radiation bias exerted serious effects on the radiation-hardened devices.  
        关键词：High-speed CMOS circuit;AC characteristic;Irradiation degeneration   
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        发布时间：2021-03-12
      • LU Wu GUO Qi YU Xuefeng REN Diyuan
        Issue 4, (2003)
        摘要：The characteristics of the total dose radiation responses of CMOS amplifiers with normal and F-implanted process were studied and compared. It is shown that the implantation of the moderate amount of fluorine ions into the gate oxide of CMOS amplifiers could visibly restrain the growing of oxide charges and interface states, reduce the leaked current, and lessen the shifts of threshold voltage induced by the total dose radiation.  
        关键词：F-implanted CMOS amplifiers;60Coγ-irradiation;Oxide charges;Interface states   
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        发布时间：2021-03-12
      • CHEN Yongzhong1 WU Sheng1 SHEN Liru2 1
        Issue 4, (2003)
        摘要：The microstructure and composition depth profiles of N+-implanted Al specimens were investigated by means of glancing angle X-ray diffraction and Auger electron spectroscopy, and the nitrogen distribution in Al after the ion implantation was also simulated utilizing TRIM?8 code. The results showed the formation of hexagonal AlN rather than cubic AlN at temperature below 300℃ for the Al specimens implanted with fluences of 7?017/cm2 and 1?018/cm2 at 60keV. The results also suggested that the collision diffusion dominated the nitrogen implantation process while both thermal diffusion and radiation enhanced diffusion were weak.  
        关键词：Nitrogen;Ion implantation;Aluminium;Microstructure   
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        发布时间：2021-03-12
      • SHAN Jie ZHOU Juanzuo WANG Changsui QIU Ping
        Issue 4, (2003)
        摘要：Petrographic analyses of the shards of terra-cotta from Qinshihuang Mausoleum showed that the terra-cotta was made of sand-tempered pottery. Pure clay samples should be obtained from pottery body using a spe-cial method to remove the tempered sand. Both pure clay and soil samples from the area of Mountain Li were ana-lyzed by ICP-AES, and then the composition data were handled with cluster analysis. Its result supported the conjec-ture that the material of terra-cotta was from Mountain Li area. The firing temperature of 4 shards of terra-cotta sug-gested that not every terra-cotta was made in the kiln, some individual might be made in the open air.  
        关键词：Terra-cotta from Qinshihuang Mausoleum;Petrographic analysis;Provenance;ICP-AES;Cluster analy-sis;Firing temperature   
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        发布时间：2021-03-12
      • WANG Yuexing LU Yongjie YANG Yifang ZHANG Jianguo
        Issue 4, (2003)
        摘要：The relative-efficiency curve of full-energy peak of various g-ray energies obtained by a NaI detector (f 76 mm 76 mm) and analytically pure KCl have been used for measuring activity of 24Na in water solutions(0.1-4Bq/cm3). The relative efficiency means the ratio of full-energy peak counting efficiency of differential energies to that of 0.8468 MeV. The method need not calibrate the measured solution by standard solution of any nuclide, of which the activity exactly has been known. The relative-efficiency curve was determined by least-square fitting of relative efficiencies of various g-ray抯 energies, E, to a function, f (E) = A + BE + CE2 + DE3 + UE4. These g energies (in MeV) included 0.8468, 1.8108 and 2.113 from 56Mn, 0.8438 and 1.0144 from 27Mg, 1.0439, 1.3175 and 1.4748 from 82Br, and 1.6422, and 2.1676 from 38Cl. These radioactive nuclides were produced by activation using neutrons from a 252Cf neutron source (of 130靏). The method may be used for measuring activity of radionuclides other than 24Na, and is more suitable to Ge detector than NaI when the relative-efficiency curve of full-energy peak is determined by g energies from 82Br only.  
        关键词：Activity measurement;24Na;KCl;Full-energy efficiency   
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        发布时间：2021-03-12
      • WANG Qingjun1 QUAN Yiwu1 ZHANG Fenying2 CHEN Qingmin1 1
        Issue 4, (2003)
        摘要：The starch grafted acrylic acid was used to synthesize water-swelling hydrogels by 60Co ?radiation grafting technique. With radiation dose of about 7 kGy, the crosslinking reagent amount of 0.01?? the pH value 58 and the starch amount of 10%20%, we can produce 600 times water-swelling hydrogels which are of high performance, low cost and suitable for agriculture.  
        关键词：Radiation polymerization;Radiation grafting;Water-swelling hydrogels;Starch;Acrylic acid   
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        发布时间：2021-03-12
      • LI Aiwu FU Cuiming ZHANG Zhilong LU Zhengyong
        Issue 4, (2003)
        摘要：To improve the detectable limit of radioactive aerosol monitors, it is very important to eliminate the inter-ference of the natural background, i.e. radon and thoron daughter aerosol. A particle size selective separator is used as artificial radioactive aerosol sampler. This separator may keep artificial aerosol from the natural radon and thoron daughter aerosol base on their different particle sizes. With the aid of the separator, most of natural background aero-sol can be rejected in sampling radioactive aerosols, which is very helpful to improving sensitivity of the radioactive aerosol monitors. The separation principle and calibration method of the separator are presented,test results are given, and some problems one must pay attention to are discussed in the paper.  
        关键词：Radon and thoron daughter;Artificial radioactive aerosol;Separator;Cut out diameter;Rejection radio   
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        发布时间：2021-03-12
      • LI Gongping ZHANG Xiaodong XU Jinzhang LIU Zhengmin
        Issue 4, (2003)
        摘要：In recent years, research on films containing the element aluminum, such as AlNi3 memory alloy and aluminum ions implanted modified film, has become very common. If proton backscattering analysis is to be used for investigating aluminum content and distribution profiles in the films, the elastic backscattering cross sections of protons from aluminum for a wide energy range are very useful data. The present paper reports our measured results of differential elastic backscattering cross sections of 0.96-2.74MeV protons from aluminum of 99.99% purity at a laboratory scattering angle of 160. Analyzed beams of proton were provided by a 21.7MV tandem accelerator at Lanzhou University. The lowest proton energy in the experiment is in the Rutherford backscattering energy region. The measured cross sections are given in tabular and graphical forms and compared with previous graphical data. The presented data should be useful for those who are interested in the reaction 27Al(p,p)27Al near 160 in a wider energy region.  
        关键词：Proton;Backscattering;Cross sections   
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        发布时间：2021-03-12
      • WANG Xuemin ZHU Shifu ZHAO Beijun JIN Yingrong SHAO Shuangyun SONG Fang LI Qifeng
        Issue 4, (2003)
        摘要：A study on the etching and passivation of CdSe wafers in the preparing process of CdSe detectors has been made by measuring the I—V curves and the ?ray spectra. The results indicate that the surface leakage current can be decreased only when proper etching and passivation have been employed, and meanwhile electric noise can also be suppressed and consequently the energy resolution of CdSe detectors can be improved.  
        关键词：CdSe detectors;I—V curves;-ray spectrum;Energy resolution   
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        发布时间：2021-03-12
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