最新刊期
      卷 0 ， 期 0 ， 2020
      • Su Xi Li Yi
        Issue 12, (1997)
        摘要：The concentration distribution of copper and titanium ions and topography in the embryos of mung bean were measured by SEM and SIMS. It is shown that the implantation depth of 70-80 μm is obviously greater than the ion′s ranges,which suggests that the improvement on breeding is caused by the direct effect of ion implantation.  
        关键词：Ion implantation;Low energy heavy ion;Mung bean;Embryos   
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        发布时间：2021-04-09
      • Sheng Shugang Lin Guoqiang Yu Yi Jiang Xiaoma Zhang Xilin Cai Haojun Guo Yigang
        Issue 12, (1997)
        摘要：A nano-second pusle RF electron gun for SFEL（Shanghai Free Electron Laser） has been developed The gun is of convergent Pierce gridded type,with a peak current of 1A, pulse width shorter than 1 ns（FWHM～0 7 ns） and a frequency of 476MHz at an injection voltage of 100kV  
        关键词：Gridded electron gun;Nano-second pulse;RF pulse   
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        发布时间：2021-04-09
      • Issue 12, (1997)
        摘要：The image formation mechanism of the neutron radiography scintillation is discussed. The main parameters which affect the resolution of image are listed. A method based on Klasens method is presented for calculating the resolution of image.By numerical calculation the relation curves of resolution versus some main parameters are worked out. The calculated results are in good agreement with the experimental ones.  
        关键词：Neutron radiography;Scintillation screen;Resolution   
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        发布时间：2021-04-09
      • Li Chunsheng Chai Zhifang Zhang Ning Hou Xiaolin Huang Wei Mao Xueying
        Issue 12, (1997)
        摘要：Thirty two elements and seven water-soluble anions in fall dust samples at the Lanzhou urban district during September 1993 to August 1994 were determined by instrumental neutron activation analysis（INAA） and ion chromatography（IC）, respectively The enrichment factors（EF） of the elements were also calculated, and the chemical compositions, distributions and seasonal variations of all the elements and anions in the fall dust were preliminarily studied  
        关键词：Fall dust;Elements;Water-soluble anions;Neutron activation analysis;Ion chromatography;Enrichment factor   
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        发布时间：2021-04-09
      • Lu Wu Guo Qi Yu Xuefeng Zhang Guoqiang Ren Diyuan Yan Rongliang
        Issue 12, (1997)
        摘要：The CMOS operational amplifier LF7650 was exposed to 1MeV electrons, and its radiation response to total dose level of electrons were investigated. The mechanisms of radiation damage and performance failure discussed in terms of recovery of the radiation susceptive characteristics in relations with time after irradiation.  
        关键词：CMOS operational amplifier;Total dose;Radiation damage;Annealing   
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        发布时间：2021-04-09
      • Zhou Ruimin Xiang Qun Song Jing
        Issue 12, (1997)
        摘要：The X-ray diffraction spectra of filter paper, saw dust and rice straw were studied after they were irradiated with electron beam. The results show that the relative crystalline degrees of these three celluloses decrease linearly and the position of their X-ray diffraction peak shifts towards smaller angles with the increasing irradiation dose. It is also shown that xylose in saw dust cannot protect the crystalline structure of cellulose against the electron beam exposure.  
        关键词：Electron beam irradiation;Crystalline degree;Cellulose   
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        发布时间：2021-04-09
      • Issue 12, (1997)
        摘要：The wavelet analysis method,used in ICT to detect edges within a cross section is introduced. Comparing with the conventional method of detecting edges from the image of ICT, this method can reduce the noise of images and can filter the non-white noise. It can also be applied in medical computerized tomography.  
        关键词：Industrial computerized tomography（ICT）;Edge detection;Wavelet analysis   
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        发布时间：2021-04-09
      • Chen Tiemei Wu En Yang Quan Hu Yanqiu
        Issue 12, (1997)
        摘要：Five fossil tooth enamel samples collected from the stratum of the Nanjing Homo erectus were ESR dated The average age is 355±42ka,based on the early uranium-uptake model Additional uranium series measurement of fossil teeth confirms the appropriateness of the early uranium-uptake model for these ESR samples Considering also the uranium-series ages of two calcite samples from the flowstone covering the fossil-containing stratum, an age value of 350±50ka for the Nanjing Homo erectus stratum is evaluated, which means that the Nanjing Homo erectus appeared in the late stage of Peking Man and also in the stage of human evolution earlier than Hexian Homo erectus  
        关键词：ESR dating;Uranium-series dating;Fossil tooth enamel;Nanjing Homo erectus   
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        发布时间：2021-04-09
      • He Wenquan Cheng Huansheng Chen Gang Ya Fujia
        Issue 12, (1997)
        摘要：Considering the geometric shape of the hair, a calculation program was designed for the PIXE analysis of hair samples with different sizes. A comparison analysis of hair was made between “wild man” and some animals. The measurement shows that one of the hair samples seems to belong to a “wild man”.  
        关键词：PIXE;“wild man”;Hair sample;Trace element   
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        发布时间：2021-04-09
      • Zhang Yongming Hong Pingshun
        Issue 12, (1997)
        摘要：The effects of some external factors on the metrologic precision of a nuclear conveyor belt scale were verified with a series of tests. It is shown that the precision is related not only with the moisture content and composition of the coveyed materials, but also with the belt′s deviation and the evenness of the materials. Mild wind seems to have no effect on the precision.  
        关键词：Nuclear conveyor belt scale;Metrologic precision;Error analysis   
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        发布时间：2021-04-09
      • Wang Bihe
        Issue 12, (1997)
        摘要：The ion beam mixing technique has been used to modify some iron and steel specimens. It is found that the wear resistance of some specimens is greatly improved （by 4-5 times）. The X-ray diffraction spectra show that some new components （Ti 2N, TiN and TiC） exist in the surface of some treated specimens.  
        关键词：Ion beam mixing;Wear resistance   
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        发布时间：2021-04-09
      • Huang Zhigao
        Issue 12, (1997)
        摘要：The Mssbauer spectra and hyperfine filed distributions P（H hf ） -H hf of as quenched and hydrided amorphous Fe 90-x Co xZr 10 x=4,10,20,30,40) and Fe 90-y Cr yZr 10 （y=0,4,7,13,16） alloys were measured at room temperature,77K and in an applied magnetic filed.The experimental results reveal that （1） the P（H hf ） curves of Fe 90-x Cr xZr 10 （x=30,40） are single and narrow,which means that they are strong ferromagnets,while the P（H hf ）curves of Fe 90-x Co xZr 10 （x=4,10,20） and Fe 90-y Cr yZr 10 （y=0,4,7,13,16） comprise two or three Gaussian distributions,and the low-filed spin（moment） fractions vary with Co（Cr） content,temperature ,applied magnetic filed and hydrogenation;and anomalous behavior exists in Co-poor Fe-（Co,Cr）-Zr alloys,indicating the magnetic inhomogeneity and Invar character;（2） the degree of disorder of spins for Fe-（Co,Cr）-Zr alloys increases with decreasing Co content and increasing Cr content;（3） the moment distributions of Fe 90-x Co xZr 10 （x=4,10,20,30,40） are preferential at the direction of the films length.A “3DFM+FS+FSC”model containing density inhomogeneity provides a satisfactory explanation for the present results.  
        关键词：Amorphous alloy;Moment distribution;Mssbauer spectra   
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        发布时间：2021-04-09
      • Xu Anwu Wang Changsui Chi Jinqi Li Mingchuan Sun Peiyan
        Issue 12, (1997)
        摘要：The ancient pottery excavated from Huating Ruins,Xinyi Country, Jiangsu Province, was measured and studied by INAA. The data were manipulated by multivariate statistic analysis,such as cluster and factor analysis. It has been shown that the specimens can be divided into two groups, which are related to Liangzhu Culture area and Dawenkou Culture area respectively. The result seems to support the viewpoint that the pottery specimens of Liangzhu Culture from Huating Ruins belong to war trophies.  
        关键词：Ancient pottery;INAA;Multivariate statistic analysis;Liangzhu culture;Dawenkou culture   
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        发布时间：2021-04-09
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