最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 12, (1995)
        摘要：The depth-distributions and tracks of 200keV N+and 110keV Fe+ions in cells have been calculated with Moose Carlo method.The calculated results are similar to those measured by RBS.The dTth of ions obtained from the calculation or the experiments is all smaller than the length of a cell.The distributions of cascade atoms produced by 200keV N+ implanted intO a cell model have also been calculated. All these calculations indicate that neither low-energy heaVy ions themselves nor the cascade atoms can directly produce biological effects in cells. Finally some possible reasons for the effects are presented.  
        关键词：Low-energy heavy ion;Cascade atoms;Cell model   
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        发布时间：2021-04-09
      • Issue 12, (1995)
        摘要：By analysing the neighbouring atoms of Fe sites in YFe10V2,a general method to assign hyperfine field to each Fe site is deduced. The Mossbauer spectra of RFe10V2（R=Y,Er）are studied in combination with the point-charge model and the effective valance model.  
        关键词：Mssbauer spectra;RE-transition permanent magnet;Intermetalliccompounds   
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        发布时间：2021-04-09
      • Issue 12, (1995)
        摘要：By using the Mossbauer spectre,the chang6 of cobment and structure of the retained austenite have been studied for A-B ductile iron under the tensile strain and recycle fatigue Btrain.It is shown that content of the retained austenite decreases with increasing strain and the micro-structure of the reclined austenite can be resolved intO two kinds of strictMe:one with and the other without C atoms arotmd Fe atoms.The existential carbon atoms eDter the interstices of the Fe fee sbocfore.The r.elative percentage of the two kinds of sboctnye depends on the strain and treshoellt Process.  
        关键词：A-B ductile iron;Retained austenite;Strain;Mssbauer spectroscopy   
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        发布时间：2021-04-09
      • Issue 12, (1995)
        摘要：The ladio-voltaic effect occuring in semiconductor elements was investigated for the tyansfer of radioisotopic decgy energy to electric power.The energy conversion processes were displayed in our experiments. It was shown that the collection ratio is 94% and 72% for the electron-hole pairs ionized by a particles from a 238pu source and by βparticles from a 90Sr source respectively. The energy conversion efficiency was about 16% for a particles and 12.2% for 0 particles.  
        关键词：Radio-voltaic effect;Decay energy;Power generation   
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        <引用本文> <批量引用> 8410446 false
        发布时间：2021-04-09
      • Issue 12, (1995)
        摘要：The sextupole ion guide（SPIG）was modified according to the requirement for on-line use.The physics principle of the modified SPIG was discussed. The trajectories of ions were traced using Monte-Carlo technique to obtain information such as transmission efficiency,spatial and velocity distribution of ions after SPIG.The effect of gas pressure on performance of the SPIG was also discussed.  
        关键词：Ion guide;Radio-frequency electric field;Atomic collision;Beamtransport;Monte-Carlo simulation   
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        <引用本文> <批量引用> 8410457 false
        发布时间：2021-04-09
      • Issue 12, (1995)
        摘要：new technique for direct and rapid analyses of total Fe content in iron ores has been developed by using the microcomputer-based portable XRF analyzer. The matrix, geometric,water and inhomogeneous mineralisation effects were also discussed in detail, and the methods of eliminating these effects were presented. The analytical error of total Fe content was less than 3%. The detecting system consisted of a 238Pu source（740MBq）,a NaI（Tl）detector and a special filter.  
        关键词：Iron ore;Sampling;Matrix effects;Portable XRF analyzer   
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        发布时间：2021-04-09
      • Issue 12, (1995)
        摘要：１９９５年全年分类主题索引1995年全年分类主题索引...  
          
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        发布时间：2021-04-09
      • Issue 12, (1995)
        摘要：The anomalous damage behaviour of BF2+ implantation into silicon at 300K and 77K has been investigated by using grazing angle Rutherford backscattering and channeling in combination with transmission electron microscopy.The damage or the amorphous layer produced by BF2+ implantation is different from that produced by other heavier ions（>27Al+）. For BF2+ implantation at 300K,there are two damage peaks,one at a depth near the projectile range of the ions and the other at the near surface,while for BF2+ implantation at 77K,the damage or the amorphous layer first occurs at the surface and is then extended to the bulk of silicon with increasing dose.  
        关键词：Silicon;BF2￣+;Ion implantation;Radiation damage   
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        <引用本文> <批量引用> 8410274 false
        发布时间：2021-04-09
      • Issue 12, (1995)
        摘要：The electronic stopping cross sections for 4He ions incident on C and Ni targets are calculated with five different formulas and the results are compared with experimental data.A universal formula based on the BK model is considered suitable for the intermediate energy region.Effects of the electronic stopping cross section on the mean projected ranges are investigated by using a linear differential equation derived by Biersack.It is concluded that by choosing an appropriate electronic stopping formula the calculations can be in good agreement with experimental data.  
        关键词：Electronic stopping cross section;Mean projected range;BK model   
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        发布时间：2021-04-09
      • Issue 12, (1995)
        摘要：A He-jet recoil tape-transport and X-Υ（t）coincidence system for separating and identifying the heavy neutyon-deficient nuclei far from the stability is described including its fundamentals, speed and efficiency.Its optimal working condition has been tested off-line.The Υ-rays from 195,196Bi and 152,153,154Er（EC+β+）decay have been measured on-line by using the system. Six new Υ-rays have been assigned to 153Er.  
        关键词：He-jet and tape-transport;X-γ（t） coincidence;EC+β￣+decay;Half-life   
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        <引用本文> <批量引用> 8410342 false
        发布时间：2021-04-09
      • Issue 12, (1995)
        摘要：A waveform generator for Mossbauer specbometers based on 8751 single chip microcomputer is described. The reference waveform with high linearity is generated with a 12 bit DAC,and itS amplitude is controlled with a 8 bit DAC. Because the channel advance and synchronous signals can be delaied arbityarily,excellent folded spectta can be acquired.This waveform generator can be controlled with DIP switches on faceplate or series interface of the IBM-PC microcomputer.  
        关键词：Mssbauer spectrometer;Waveform generator;D/A convertor;Foldedspectrum   
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        <引用本文> <批量引用> 8410607 false
        发布时间：2021-04-09
      • Issue 12, (1995)
        摘要：In this paper introduced is the speciality of a multichannel analyzer software system realized by C LangUage. Because of its superior performance,the software has brillliant prospects for applications.  
        关键词：Multichannel analyzer;Spectrum analysis;Peak search;Net area of a peak   
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        发布时间：2021-04-09
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