最新刊期
      卷 0 ， 期 0 ， 2020
      • Xu Junquan
        Issue 4, (1994)
        摘要：The spectra of L X-ray induced by 2 MeV proton impact on Nd, Dy and Yb have been analysed and the L1- and L2 subshell fluorescence yields of these elements are obtained. The present results are in agreement with the theoretical and the compiled data as well as the published experimental values within the errors.  
        关键词：Ionization;L X-ray;Fluorescence yield   
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        发布时间：2021-04-09
      • Issue 4, (1994)
        摘要：A modified method of Lorentzian fitting without an iterative procedure is presented. It has been compared with the non-linear least-square method and the previously proposed non-iterative method. The validity of the method has been confirmed.  
        关键词：Mossbauer spectra;Linearization technique   
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        <引用本文> <批量引用> 8408923 false
        发布时间：2021-04-09
      • Issue 4, (1994)
        摘要：A multi-parameter coincidence detector system consisting of a △Eβ-Eβ telescope, two germanium detectors and a slow clock time-to-digital converter （CTDC） has been set up. For studying neutron-rich nuclei, the △Eβ-γ coincidence is employed to reduce intensity of γ-rays from neutron-deficient nuclei. The CTDC can give nuclear decay time parameters for determining half-life of nuclear decay, showing that this detector system can be used to study nuclear decay scheme.  
        关键词：Coincidence;Heavy neutron-rich nuclei;Clock time-to-digital converter;Decay   
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        <引用本文> <批量引用> 8408931 false
        发布时间：2021-04-09
      • Issue 4, (1994)
        摘要：The ionizing radiation response of two fluorinated gate dielectrics has been compared. It is shown that the F implanted gate oxides for H2+O2 oxidation have stronger ability of suppressing radiation-induced oxide charges and interface states than that for dry O2 oxidation. The experimental results are explained with a model, in which the Si-F bonds are taken as a substitute for other stress bonds that is easy to form charge traps under irradiation and some existing differences are considered between two gate oxides in term of the number of electron traps and defects as well as the hole mobilities.  
        关键词：Threshold voltage;Oxide charges;Interface states;I-V curves;Ionizing radiation;MOSFET   
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        <引用本文> <批量引用> 8408945 false
        发布时间：2021-04-09
      • Issue 4, (1994)
        摘要：Crystallization of the amorphous Fe73.1Cu1.2Nb3.2Si12.5B10.0 alloy has been investigated by M6ssbauer spectyoscopy and X-ray diffraction. The experimental results show that there exist two crystallization steps in this alloy. After the first step the sample consists mainly of two part, i.e. ultrafine crystal particles of DO3 type a-FeSi alloy and an amorphous phase as grain boundaries. With increasing annealing temperature, amount of the crystal phase increases with the expense of residual amorphous phase. Residual amorphous Phase changes to Fe2B and Fe23B6 compound as well as presumed Fe-Nb-B paramagnetic phase after the second step.  
        关键词：Fe-based amorphous alloy;Mossbauer effect;X-ray diffraction;Crystallization   
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        <引用本文> <批量引用> 8408964 false
        发布时间：2021-04-09
      • Issue 4, (1994)
        摘要：he trace elements distribution along scalp hair is measured by SR excited XRF. The results of repeat scanning of a single hair and a strand of five hairs from the same person show that precision of the experiments is very well. The content change tendecies of most elements for 3 different hairs taken from the same area of one person are basically the same and a similar concentration gradient is presented. But the tendencies for different person’s hair are quite different.  
        关键词：Synchrotron radiation;X-ray fluorescence analysis;Scalp hair;Trace element analysis   
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        <引用本文> <批量引用> 8408978 false
        发布时间：2021-04-09
      • Issue 4, (1994)
        摘要：Monte-Carlo computer simulations based on the binary collision approximation have been employed to study the range profiles of energetic Si+ ion implantation in Si3N4/GaAs targets. Both the simulations and the experiments showed that a layer of Si3N4 deposited on the surface of GaAs substrate would reduce the range of Si+ ions in GaAs substrate effectively, but a lot of St and N atoms in the Si3N4 layer moved into GaAs substrate due to collision with the incident Si+ ions. Deposition of a layer of amorphous Si3N4 on the GaAs crystal surface followed by high energy ion implatation is a good method to obtain shallow junction and to avoid channeling effects.  
        关键词：Monte-Carlo simulation;Ion implantation;Channeling effects;Shallow junction   
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        <引用本文> <批量引用> 8408998 false
        发布时间：2021-04-09
      • Issue 4, (1994)
        摘要：his report describes the routine method for producing spiroperidol by seven steps of chemical synthesis. Br-p-bromospiroperidol was prepared by reacting 77Br, H2O2 and spiroperidol in glacial acetic acid. The purity of the product was checked by TLC. The labelling rate was 92% and the overall radiochemical yield was 78% with radiochemical purity of 95%. The in vivo distribution of 77Br-p-bromospiroperidol in the mouse brain was studied. It was shown that the uptake of 77Br-p-bromospiroperidol in striatum was six times higher than that in cerebellum.  
        关键词：Neuroreceptor imaging agent;Dopamine D2 receptor;Spiroperidol   
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        <引用本文> <批量引用> 8409011 false
        发布时间：2021-04-09
      • Issue 4, (1994)
        摘要：On the basis of both our work on electronic structures and positron annihilation lifetimes for point defects and point-like defects in aluminium and the comparison with the related experimental data in details, the applicability of the jellitum model as well as its correction are described. The validity and limitations of other density functional theory methods such as Puska’s noninteraction atom model and PLAPW method are also discussed. It is shown that the jellium model is a useful tool to calculate the electronic structures of smaller voids （dia. <4nm） in metals.  
        关键词：Positron annihilation lifetimes;Density functional theory;Jelliium model   
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        <引用本文> <批量引用> 8409020 false
        发布时间：2021-04-09
      • Issue 4, (1994)
        摘要：An ultra-thin window Si（Li） detector used for measuring low energy X-rays is designed. The PIXE spectrum range has extended to still lower energies of characteristic X-rays originated from St, Al and Na. Some practical applications of the detector are also presented.  
        关键词：Ultra-thin window Si（Li） detector;PIXE spectra   
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        <引用本文> <批量引用> 8409029 false
        发布时间：2021-04-09
      • Issue 4, (1994)
        摘要：Relationships between the hFE value of transistors and irradiation dose, dose rate, annealing temperature, annealing time and irradiation methods are studied. The results show that the hFE value can be decreased effectively by elctron beam irradiation and be stabilized by annealing treatment.  
        关键词：Electron beam;Irradiation;Transistors;hFE value;Annealing   
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        <引用本文> <批量引用> 8409040 false
        发布时间：2021-04-09
      • Feng Qi
        Issue 4, (1994)
        摘要：he feasibility of using a neutron moisture gauge to study moisture change in semi-humid sandy land was affirmed. The gauge is compact and can rapidly take measurements with small errors. It is found that both the inter-ubstance boundary surface and the space formed in fiting the neutron tube affect obviously the precision of measurements in the survey process. The calibration variance is the most important part of total uncertainty in measurements.  
        关键词：Neutron moisture gauge;Semi-humid sandy land;Variance analysis   
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        <引用本文> <批量引用> 8409058 false
        发布时间：2021-04-09
      • Issue 4, (1994)
        摘要：A microcomputer-based system for universal nuclear measurements is described, in which data acquisition and processing are controlled by a single-chip microcomputer MC68705R5.  
        关键词：Nuclear measuring instrument;Data acquisition;Data processing;Single-chip microcomputer   
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        <引用本文> <批量引用> 8409071 false
        发布时间：2021-04-09
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