最新刊期
      卷 0 ， 期 0 ， 2020
      • YANG Yigang WANG Rushan LI Yuanjing
        Issue 4, (2002)
        摘要：Least square smooth filtering is the general method used to treat the γ spectrum with fluctuation. The fluctuation can be well reduced, however, the shortcoming of this method is that the shape of the γ spectrum may be distorted. For its benefit of multi-resolution, wavelet analysis is used to filter the complex γ spectrum, the flucturation of γ spectrum is filtered, while the shape of characteristic peak is still kept well.  
        关键词：Least square smooth filtering;Fluctuation;γ spectrum;Wavelet analysis;Multi-resolution;DFT   
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        发布时间：2021-03-12
      • WANG Yanping TANG Benqi LI Guozheng HE Caohui CHEN Xiaohua
        Issue 4, (2002)
        摘要：A new 252 Cf irradiation and measurement system for simulating single event effect has been developed. The experimental results for power MOS transistors and SRAMs are presented.  
        关键词：Cf source;Single event effect;Heavy ion simulation   
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        发布时间：2021-03-12
      • WANG Tieshan DING Baowei WANG Zhiguo WANG Xianyi
        Issue 4, (2002)
        摘要：N(p,α) 12 C reaction was applied to analyze the nitrogen content in metal samples of Mo 15 N X, Ti 15 N X, Ti, Mo, Ti 2H X, Ti 1H X and TiMo etc. The method was calibrated by using standard implantation targets. Significant amount of nitrogen was found in the titanium deuteride (Ti 2H X) and hydride (Ti 1H X). The nitrogen trapping feature of titanium deuteride was discussed.  
          
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        发布时间：2021-03-12
      • LIU Xiaojing ZHU Linfan YUAN Zhensheng JIANG Ximan CAI Bei CHEN Xiangjun XU Kezun
        Issue 4, (2002)
        摘要：Experimental studies have been made on an electron based on microchannel plate in order to investigate influences of the sub-voltage over its detection efficiencies under the new type of high voltage supply system.  
        关键词：Microchannel plate(MCP);Electron detector;Detection efficiency   
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        发布时间：2021-03-12
      • QIAN Tianwei GUO Zhiming GUO Qian
        Issue 4, (2002)
        摘要：In order to study the mechanism of double peaks at nuclide migration in unsaturated zone, theoretical analysis and calculations were carried out. The results indicated that ion exchange processes did not cause the double peak phenomena. The field experiments in unsaturated zone were also conducted by using the stable isotope tracers of Sr, Nd and Ce. The results verified such doubles peaks might be caused by the difference of K d between the source and loess layers.  
        关键词：Double peak phenomena;Nuclide migration;Loess   
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        发布时间：2021-03-12
      • YANG Bin LEI Jiarong WANG Dezhi HUANG Ningkang
        Issue 4, (2002)
        摘要：Tungsten films with different thickness were deposited by ion beam mixing techniques on the austenitic stainless steel. Microanalyses of XRD and SEM were measured for the deposited tungsten films before and after H + ion irradiation. The effect of the morphology and phase structure of the tungsten films by H + ion irradiation was studied. The results showed that the deposited tungsten films were nearly amorphous, and tungsten oxides were found due to the contamination of oxygen before H + ion irradiation. Simulation of H + ion irradiation on these films showed that a little crystalline tungsten was gradually transformed into amorphous and the contamination of WO 3 was significantly reduced by preferential oxygen sputtering. There is little difference between surface morphologies of tungsten films before and after H + ion irradiation. Tungsten films surfaces still showed dense, uniform, complete and no obvious damages after H + ion irradiation.  
        关键词：Ion beam mixing;Tungsten film;H + ion irradiation   
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        发布时间：2021-03-12
      • LI Hui XIA Weidong WAN Shude WANG Hai LI Junfeng
        Issue 4, (2002)
        摘要：Three-dimensional heat transfer equation was used to discuss the circular region of high temperature formed on the surface of the tubular tungsten cathode, the cathode surface temperature in the region becomes uniform gradually (except that at the point of the cathode arc root) when the cathode arc root of the secondary arc is rotating on surface of the tungsten cathode and the rotating frequency of the secondary arc root is increasing. And the necessary condition of the cathode surface temperature is provided to form the model of the multi-arc-root or diffusive arc root. At the same time, the cathode surface temperature at the point of the cathode arc root decreases and reaches a constant when the rotating frequency increases.  
        关键词：Cathode arc root;Diffusive arc root;Arc plasma heater;Key arc;Secondary arc   
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        发布时间：2021-03-12
      • DENG Rui YU Xiaojiang PAN Haibin XU Faqiang XU Baozong XU Pengshou
        Issue 4, (2002)
        摘要：In order to satisfying needs of many kinds of the new scientific experiments, the data acquisition and control system of the photoelectron spectroscopy station at NSRL has been reconstructed. The hardware upgrading includes adding a Multi-Card, changing the motor controller and introducing the photo-energy feedback. The corresponding software was rewritten. At the same time, software itself was improved. The parameters could be saved and loaded; The format of the data was changed to a convenient way; And the XPS modes using different targets were included in the software. At last, a group of EDCs (Energy distribution curve) of the Fermi edge of Ni were measured to demonstrate the whole improved system.  
        关键词：Beam line;Software design;Application of synchrotron radiation;Photoelectron spectroscopy   
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        发布时间：2021-03-12
      • BAI Yun
        Issue 4, (2002)
        摘要：The ITO(Indium Tin 0xide) film and MCP(Microchannel Plate)were combined to form a position sensitive detector, the lineality, position sensitivity and detection efficiency of the detector were tested, the result was fairly satisfied.  
        关键词：IT0 film;Position sensitive detector   
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        发布时间：2021-03-12
      • XIA Yijun YANG Zhihua LUO Xiaobing
        Issue 4, (2002)
        摘要：The cross sections for the 75 As(n,γ) 76 As reaction were measured relatively to that of 197 Au in neutron energy range from 29 to 1100 keV, using the activation technique. The accuracy of the measurement was 6.7-7.8%. The experiment results were compared with existing data.  
          
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        发布时间：2021-03-12
      • LIU Jingyi YU Xiaohan GU Jiahui CAO Yuxiang SHI Shuanghui LI Yan YIN Duanzhi
        Issue 4, (2002)
        摘要：The γ-ray spectra of 188 Re decay have been studied by using a compton-suppressed spectrometer and a three parameters γ-γ-T coincidence system. Experimental data analysis demonstrates that six γ-rays at 810, 1463, 1936, 557, 1867 and 2022keV and 1443, 1936 and 2022keV three levels are confirmed again. Eight new γ-rays at 1982.5±0.2, 1842.5±0.2, 1828.2±0.1, 1103.7±0.4, 1086.13±0.03, 979.29±0.08, 826.90±0.02, 309.60±0.04keV, tree new levels at 1982.5, 1828.2, 309.60keV have been found in the γ singles, Compton-suppressed spectra and coincidence spectra .The experimental data were analysed by ENSDF (Evaluated Nuclear Structure Data File) in detail and the modified decay scheme was presented.  
        关键词：Decay scheme;Compton suppressed spectrometer;Multi-parameter acquisition system   
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        发布时间：2021-03-12
      • QIU Zhijun WANG Jiqing GUO Panlin LI Xiaolin ZHU Jieqing LU Rongrong
        Issue 4, (2002)
        摘要：A scanning proton microprobe (SPM) with high resolution and high sensitivity was applied to analyze trace elements in chicken embryo forebrain neuron cell and skeletal muscle myotube cell. The absorption of the two different cells to zinc ions, correlation of elements and trace elemental distributions in the cells were studied. The results indicate that the absorptive capacity of the chicken embryo forebrain neuron cell to zinc ions is larger than that of the chicken embryo skeletal muscle myotube cell, and the concentrations of intracellular trace elements such as Cr, Fe, Ni are explicitly higher. The correlations of elements such as S and Zn or Fe and Zn are positive, but the correlations of P and Ni or Cr and Fe are negative. From the maps of cellular elemental distribution the contents of the different elements are different in the intracellular parts, for example, the contents of the elements phosphorus, sulfur, potassium in the cell membranes are higher than that in the cells.  
        关键词：Chicken embryo cells;Trace elements;Scanning proton microprobe (SPM)   
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        发布时间：2021-03-12
      • DONG Xiaoli ZHAO Tao JIN Zhengfang ZHANG Haiyan CAI Ping
        Issue 4, (2002)
        摘要：The connection of the high performance 14 bits D/A convert chip MX7534 and 24 bits D/A convert chip AD7714 with microcomputer 89C51, and the principle of control system of the high precision stabilized power supply consisted of these components were discussed. The interface of the circuit and the system’s software are also discussed.  
        关键词：D/A convert;A/D convert;Interface;Microcomputer;Stabilized power supply   
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        发布时间：2021-03-12
      • XIE Zongchuan LIU Dantao ZHU Jiating
        Issue 4, (2002)
        摘要：Determination of redox potential, ultraweak luminescence and color tristimulus values etc. of the nutritive lotion creams irradiated by 60 Co was conducted to study the critical dosage. The results indicate the critical dosage is about 8kGy.  
        关键词：Nutritive lotion cream;60 Co γ ray irradiation;Critical dose   
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        发布时间：2021-03-12
      • XU Weixin JIN Huijuan LIN Yijian ZHANG Jingguo
        Issue 4, (2002)
        摘要：An amorphous superfine powder of Fe-Zr-B prepared by reduction has been analyzed using differential thermal analysis, X-ray diffraction, and Mssbauer effect. The influence of Zr on the forming of amorphous superfine of Fe-Zr-B was studied, and compared with the amorphous superfine powder of Fe-B. The results suggests that the Fe-Zr-B powder may consists of two amorphous microstructures.  
        关键词：Fe-Zr-B alloy;Superfine powder;Mssbauer effect   
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        发布时间：2021-03-12
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