最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 7, (1995)
        摘要：The electronic structure of pure BaF2 crystal and La doped BaF2 crystal have been calculated using a self-consistent molecular-cluster model. The cluster is embedded in the crystal lattice and the entire system is treated iteratively in the Hartree-Fock-Slater local-density theory. As La doped BaF2 is concerned, the obtained results reveal that the Fi introduced by La may contribute to the suppression of the slow component in the scintillation light of BaF2 crystal.  
        关键词：La doped BaF2 crystal;Slow component suppression;Embedded molecular-cluster model;Hartree-Fock-Slater local-density discrete variational method   
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        发布时间：2021-04-09
      • Issue 7, (1995)
        摘要：The tooth samples from Zhoukoudian, the Peking Man Cave were studied. Their ESR ages were calculated by the uranic linear accumulation model.The comparison of ESR ages with ages from U-series, FT and TL methods was performed.The results show that the enamel tooth is a suitable material for ESR dating.  
        关键词：Enamel tooth;ESR dating;Uranic linear accumulation model   
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        发布时间：2021-04-09
      • Issue 7, (1995)
        摘要：Ladder polymer poly（benzimidazobenzophenathroline） （BBL） was doped with P+ by ion implantation of 30keV, 4×1016 P+ ions/cm2. The changes of spectroscopic characteristics （IR,UV-visible and ESR） and conductivity were observed. The BBL film doped by ICl was also studied as a contrast.  
        关键词：Ladder polymer BBL;Ion implantation   
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        发布时间：2021-04-09
      • Issue 7, (1995)
        摘要：The Spodoplera litura Nuclear Polyhedrosis Viruses （SINPV）is a kind of insectile virus with a simple structure, in which a double helix DNA is encapsulated in a protein coat and there is no function of enzymatic repair. In this study, the SINPV samples in dry powdered form held in sealed plastic tube were irradiated by 1-100kGy gamma rays. The single strand breaks （SSB） and double strand breaks （DSB） induced in SINPV after irradiation were measured by neutral and alkaline agarose gel eletrophoresis.A dose-response function combining the responses of one-hit and two-hit events was used to describe the SSB and DSB dose-response curves. It is shown that the SSB are one-hit events and the DSB are the combination of both one-hit, and two-hit events, and two-hit events are predominant in the DSB process.  
        关键词：Spodoplera litura Nuclear Polyhedrosis Viruses（SINPV）;DNA strand breaks;Dose response function   
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        <引用本文> <批量引用> 8409646 false
        发布时间：2021-04-09
      • Issue 7, (1995)
        摘要：A kind of TOF telescope has been developed.Its mass resolution A/△A,time resolution, energy resolution and Charge resolution Z/△Z for 25 MeV/A 40 Ar ions are 67, 344ps, 0.8% and 46 respectively.  
        关键词：TOF telescope;Charge resolution;Mass resolution;Energy resolution;Time resolution   
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        <引用本文> <批量引用> 8409661 false
        发布时间：2021-04-09
      • Fang Qinxue
        Issue 7, (1995)
        摘要：The 120nm coatings of Al and Al-Mg on low carbon steel EN8 have been irradiated with 65keV, 6×1016 Ar+2/cm2. Adhesion of the coatings on the substrate is tested. The corrosion potential measurement and immersion test are carried out in acetic acid buffer solution with pH=5.6. The experiments indicate that the corrosion resistance of the sample increases effectively due to the cathodic protection of magnesium in the coating.  
        关键词：Ion beam mixing;Coating;Corrosion;Cathodic protection   
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        <引用本文> <批量引用> 8409698 false
        发布时间：2021-04-09
      • Issue 7, (1995)
        摘要：A study of flame-retardation of radiation crosslinked PE foam is described. It is experimentally proved that if only red phosphorus is added to basic composition, the final foam shows almost no flame retardation; but when red phosphorus is added with halogenated organic moiety, the PE foam shows obvious degree of flame retardation.In this way, the best composition of flame-retarding PE foam is obtained and its properties are listed.  
        关键词：Radiation crosslinking;PE;Foam;Flame-retardation   
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        发布时间：2021-04-09
      • Issue 7, (1995)
        摘要：The adsorption behavior of germanium and gallium on cerium dioxide was investigated and a test 68Ge-68Ga generator based on CeO2 was performed. The optimum eluant chosen is 0.02mol/L HCl. The yield of 68Ga is more than 45% and the breakthrough of 68Ge is less than 0.007%. The eluates are free of other radioactive impurities and no dissolved cerium has been found in eluates.  
        关键词：?68)Ge;￣（68）Ga;Isotope generator;CeO2   
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        <引用本文> <批量引用> 8409716 false
        发布时间：2021-04-09
      • Issue 7, (1995)
        摘要：Induced thermoluminescence（TL）properties of Chinese 11H,6L and 3LL chondrites have been measured.TL peak temperature and peak width are 163-206℃,Av.and 83-137℃ for H chondrites,183-203℃,and 111-143℃,for L and LL,respectively. Recently fallen Chinese ordinary chondrites have TL peak width generally smaller than those of ordrinary chondrites from other regions.Based on our TL sensitivity data and published noble gases data, a 3He exposure age/21Ne exposure age-Induced TL sensitivity-4He gas retention/40Ar gas retention diagram is introduced. This type of diagram is a powerful tool for distinguishing different thermal histories of meteorites.  
        关键词：Ordinary chondrites;Induced thermoluminescence;Thermal history   
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        <引用本文> <批量引用> 8410996 false
        发布时间：2021-04-09
      • Issue 7, (1995)
        摘要：Immature embryos from three self-bred series of M1 corn（Zea mays）were cultured in MN and AG medium after dry seeds were implanted to 2×1016cm-2 N+ ions of 60keV and grown into M1 plants. The experiments indicated that all genotypes formed pale-yellow or yellow callus in the two media. The average callus induction frequency of M1 immature embryos was 11.7% higher than that of the control. Percentages of callus were different not only for various genotypes of the culture material in the two media, but also for different concentration of 2,4-D and 6-BA.  
        关键词：Corn（Zea mays）;Nitrogen ions implantation;Callus inductivity;Plant regeneration   
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        发布时间：2021-04-09
      • Issue 7, (1995)
        摘要：The PIXE method is used for the determination of elemental concentrations in cancellous bone of human femoral head from five autopsies and seven patients with femoral neck broken. The specimen preparation and experimental procedure are described in detail. Using t test, the results show that the concentrations of P, Ca,Fe, Cu and Sr in control group is higher than those in patient group, but there is no remarkable difference for the concentrations of S, K, Zn and Mn. The physiological functions of some inorganic elements in human bone are also discussed.  
        关键词：PIXE analysis;Trace element;Cancellous bone   
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        发布时间：2021-04-09
      • Issue 7, (1995)
        摘要：The positron lifetime spectra of the YBa2Cu3-xSnxOy system have been measured and the local electron density ne and vacancy concentration Cv have been calculated as a function of Sn substitution x. The results show that a sigificant Sn-substitution dependence exists. For lower x（<0.4）, ne has a big continual variation and for higher x（>0.8）, it is level off with a value of about 5.6×1023cm-3. But for Cv a big anomalous change occurs between x=0.8-1.0 and this may be the attributed to the structural phase transition.  
        关键词：Positron lifetime spectra;YBa2Cu3Oy superconductor;Elemental substitution;Electron density;Vacancy concentration   
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        <引用本文> <批量引用> 8409771 false
        发布时间：2021-04-09
      • Issue 7, (1995)
        摘要：Free radicals were studied at room temperature by the ESR spectrum method after wheat seeds were irradiated by the medium energy nitrogen ion beam.It is found that the variation of free radical concentration as total dose has different feature for the penetrated and implanted seeds. The relationship between free radical concentration in wheat seeds penetrated by nitrogen ions and dose rate was also discussed.  
        关键词：Medium energy nitrogen ions;Wheat;ESR spectrum;Free radical;Dose;Dose rate   
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        <引用本文> <批量引用> 8409786 false
        发布时间：2021-04-09
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