最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 2, (1999)
        摘要：The combinatorial ion beam implantation technique has been applied to synthesize a silicon-based material chip with 64 samples of 2 mm diameter size on it. The Rutherford backscattering spectrometry and photon elastic scattering were used to analyse the samples on the chip.The depth-resolved cathodoluminescence measurement of the samples has provided some clues for optical properties correlated with the impurity distribution in the material.  
        关键词：Combinatorial technique;Ion beam technique;Material chip   
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        发布时间：2021-03-12
      • Issue 2, (1999)
        摘要：A new nuclear technique, channeled ion-beam synthesis, has been developed and used to form rare-earth silicides. Comprehensive analyses including Rutherford backscattering and channeling spectrometry, transmission electron microscopy and X-ray diffraction show that the rare-earth silicides formed by the channeled ion-beam synthesis have very good crystalline quality, e.g. the Xmin. value for ErSi1.7 is only 1.5%.  
        关键词：Channeled ion-beam synthesis;Rare-earth silicides   
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        发布时间：2021-03-12
      • Issue 2, (1999)
        摘要：The radioactive decay of 135La has been studied with the aid of a low background Compton suppression spectrometer and HPGe detectors.The single spectra, Compton suppressed spectra and r-r coincidence spectra were measured.The energies, intensities and cascade relations of r-rays from low excited levels were obtained and the decay scheme of 135La was deduced. The levels of low excited states were calculated using the angular momentum projected shell model(PSM) and compared with experimental values.  
        关键词：Low background Compton suppression spectrometer;Decay scheme;Angular momentum projected shell model   
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        发布时间：2021-03-12
      • Issue 2, (1999)
        摘要：Supersonic molecular beam injection (MBI), a new fuelling method, has been used in the HL-1 and HL-1M tokamak for the first time.Compared with the conventional fuelling, MBI has the following advantages:the fuelling particles can penetrate deeper and a peak in electron density distribution is formed which improves the confinement. The upper end of density ne for the linear ohmic confinement regime can reach 4 10`19gm-3. The experimental results indicate that MBI is an advanced and simple gas fuelling method for fusion plasma.  
        关键词：Tokamak;Supersonic molecular beam;Density limit;Energy Confinement   
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        <引用本文> <批量引用> 7201915 false
        发布时间：2021-03-12
      • Issue 2, (1999)
        摘要：The HSS samples were implanted with 3×10`17cm-2 of 60keV C ions and (2-6) 10`17cm-2 of 102keV Co ions respectively, from a MEVVA ion source.The average beam flux was about 26.5 A. cm-2 The surface friction coefficient and hardness were measured, and wearing test was made. It was shown that the surface hardness of C, Co or C+Co implanted HSS increased from 15% to 50%, and the C+Co dual implanted surface of HSS was the hardest.The surface friction coefficient of HSS implanted with Co or C+Co ions decreased from 0.42 to 0.14. The wear resistance of the surface modified by C+Co dual implantation was better than that modified by C or Co single implantation. The surface of HSS implanted with Co ions had better lubricity, elasticity and tenacity. The C+Co dual implantation was one of the best methods to improve the surface wear resistance of HSS.  
        关键词：Ion implantation;HSS;MEVVA ion source;Hardness;Friction coefficient;Wear resistance   
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        发布时间：2021-03-12
      • Issue 2, (1999)
        摘要：Relation between the fluorescence spectrum and decay time of lead tungstate crystals was studied by using the single photon technique. The fluorescence decay characteristics of lead tungstate crystals grown under different conditions were measured.The decay time before and after irradiation was compared.It is shown that La doping is an effective way to increase the fast component.  
        关键词：Lead tungstate;Fluorescence decay time;Irradiation;La doping   
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        <引用本文> <批量引用> 7199866 false
        发布时间：2021-03-12
      • Issue 2, (1999)
        摘要：The charged pareicle beam transport in dipole magnet field and its aberrations are analyzed with the Lie algebraic method.The first and second order terms of particle trajectories are obtained.The procedures can be extended to higher order aberrations if desired.  
        关键词：Lie algebra;Dipole magnet field;Aberration   
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        <引用本文> <批量引用> 7200045 false
        发布时间：2021-03-12
      • Issue 2, (1999)
        摘要：The effect of detector on measurement of a stochastic neutron field is discussed with the master equation for the detailed balance of probabilities. It is suggested that the effect will be reduced as increasing detector reaction with neutrons.  
        关键词：Induced fission;Stochastic neutron field;Master equation for the detailed balance of probabilities   
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        <引用本文> <批量引用> 7199904 false
        发布时间：2021-03-12
      • Issue 2, (1999)
        摘要：The vacuums in the arc chamber,the extracted region and the control positions of the Freeman source at typical gas-rates were measured.The temperature-raising distributions at the arc-charmber’s wall and the oven end heated by the filament and arc discharge were obtained. The effect on discharge properties of the filament oxidation caused by micro-leakage of water vapour,and the effect of Ar+-assisted discharge on outside short circuit of the filament are discussed.  
          
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        发布时间：2021-03-12
      • Issue 2, (1999)
        摘要：This paper describes the structural finite element analysis of RF cavity design for the HLS storage ring. The structural behaviours including displacement, stress, thermal field, heat stress, heat deform, natural frequency and modal shape are very important to the structural and water cooling design of the RF cavity.  
        关键词：: RF cavity;Resonant frequency;Shunt impedance;Finite element analysis;Thermal field   
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        发布时间：2021-03-12
      • Issue 2, (1999)
        摘要：The mechanism of extraction of uranium(VI) from nitric acid solutions with anovel extractant N,N’-tetrahexylmalonamide (THMA) in n-octane was investigated. The effects of concentrations of aqueous nitric acid, extractant and sodium nitrate and also the temperature on extraction distribution ratios were studied. The extraction stoichiometry was established and the structure of extracted complex was analyzed by means of the IR spectra.The extraction constant of uranium(VI) with THMA and the reaction enthalpy were calculated.Compared with N,N’-tetrabutyl- malonamide (TBMA),it is shown that the increase of the alkyl chain for THMA lowers the formation of third phase. The study of the effect of diluents indicates that the extractability of THMA in n-octane for uranium(Vl ) is higher than that in toluene.  
          
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        发布时间：2021-03-12
      • Issue 2, (1999)
        摘要：The elements K, Ca, Fe, Cu, Zn, Se and Rb in erythrocyte of 78 cases with different thyroid hormone status have been measured by PIXE and INAA. According to status of thyroid hormones T3, T4, TSH, FT3 and FT4 radioimmunoassayed, all patients were divided into four groups,i.e. hyperthyroid, normal,critical(one of thyroid hormones was abnormal) and hypothyroid.A comparison between four groups was performed and the correlations between different parameters (elements and thyroid hormones) were analyzed by oneway-anova and correlation using SPSS/PC statistical package respectively.The results show that the contents of Se between four groups are not significantly different (P< 0.05), the content of Zn for hypothyroid group is significantly higher than these for hyperthyroid and critical groups, the content of Zn for normal is between that for hypothyroid and the other two groups. For hyperthyroid group, there are significant correlations between elements measured and between thyroid hormones (except TSH), but not between elements and thyroid hormones. However for hypothyroid group,relatively strong correlations have been found between elements and thyroid hormones,specially Zn and T3/T4 ratio, and Zn and TSH.  
        关键词：Trace elements;Thyroid hormones;Erythrocyte;Hyperthyroidism;Hypothyroidism   
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        发布时间：2021-03-12
      • Issue 2, (1999)
        摘要：Various focusing methods of the hard X-rays and applications of the hard X-ray microprobes at various synchrotron radiation laboratories are systematically introduced.  
        关键词：X-rays;Focuing;X-ray microprobes;Micro-analysis   
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        发布时间：2021-03-12
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