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      • Yongxian Wang,Junlong Qian,Fujia Yang
        Vol. 13, Issue 2, (1990)
        摘要：The essential intension of nuclear techniques is expounded. The historical developments of nuclear techniques are reviewed. The effects of nuclear techniques on national economy are discussed in detail. As a high technology, nuclear techniques have been in vigorous development with increasing economical benefits. It is expected that nuclear techniques will play greater roles in transforming traditional fields of economy and bringing about a new technological revolution.  
        关键词：Nuclear techniques;National economy;New technological revolutions   
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        发布时间：2022-08-16
      • Jinghua Qian,Qiyun Shao,Yurong Zhang,Xiaofeng Wu,Agen Zhang,Longxing Zhang
        Vol. 13, Issue 2, (1990)
        摘要：The concentration depth profile of fluorine has been measured with narrow resonances of nuclear reactions. In order to find the applicable range of the deconvolution method' two kinds of level-widtn with Г>1 keV or Г<1keV have been measured for the same sample. The results indicate that the method is still applicable to the level-width below 1 keV.  
        关键词：Fluorine;Amorpnous-silicon;depth profile   
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        发布时间：2022-08-16
      • Jingcheng Wang,Yunlong You,Chunyong Jing,Quanqin Yu
        Vol. 13, Issue 2, (1990)
        摘要：In order to investigate the change of defects in Fe70Cr18Mo2Si1B9 microcrystal alloy, measurements of S-lineshape parameter of Doppler-broadened spectrum of positron annihilation were carried out for as-quenched ribbons treated at different temperatures, bulk samples prepared by crashing and hot-pressing, and bulk samples annealed at 1000℃, respectively. The results show that in the as-quenched ribbons there are three kinds of defects which are reduced in two steps during heat-treatment (at room temperature-600℃and 800—1000℃). In the bulk samples by crashing and hot-pressing a lot of stable defects are created with different amount when using different hot-pressing methods and the defects can hardly be removed even at high temperature up to 1000℃.  
        关键词：Positron annihilation;Defects;Microcrystal alloy   
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        发布时间：2022-08-16
      • Zhong Cao,Zhengde Huang,Qun Chen
        Vol. 13, Issue 2, (1990)
        摘要：The gain stabilities and temperature effects were experimentally for three different bias voltage supply modes to photomultipliers at high counting rates. Comparisons of the counting rate effects were made for different bias voltage values and for the anode and the dynode output modes respectively. The factors causing gain variation at high counting rates were discussed. It was shown that the transistor emitter follower supply mode, the lower bias voltage value and the dynode output mode were three effective measures to improve the gain stability at high counting rates.  
        关键词：Photomultiplier;Scintillation detector;Counting rate effect;Gain stability   
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        发布时间：2022-08-16
      • Qiyun Shao,Huansheng Cheng,Hongjie Xu
        Vol. 13, Issue 2, (1990)
        摘要：The surface peak intensity for silicon and aluminium crystals has been studied for He+ ion incident energy ranging from 0.1 to 2.0 MeV by the Monte Carlo simulation method assuming a variety of surface structure models. The effects of He+ ion incident energy and incident angle, thermal vibration amplitude, correlations of thermal vibrations, displacements and adsorption of surface atoms as well as enhancement factor on the surface peak intensity are investigated.  
        关键词：Surface peak intensity;Monte Carlo simulation;Shadow cone;radius Reconstructed surface;Relaxed surface   
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        发布时间：2022-08-16
      • Keming Zhan,Jianming Yuan,Xiaoma Jiang
        Vol. 13, Issue 2, (1990)
        摘要：In order to calculate the dynamic NMR (DNMR) spectra possessing signals with unequal half-height widths the corresponding equation has been derived. According to this equation we have calculated the DNMR spectra of N,N-dimethyl acetamide. The ealculated spectra were in good agreement with the experimental spectra measured at some specific temperatures.From Arrhenius and Eyring equations we calculated the thermodynamic functions of this exchange reaction, i. e. Arrhenius activation energy Ea, the entropy of activation ∆S++, the enthalpy of activation ∆H++ and the free energy of activation ∆G++.  
        关键词：DNMR;Theoretical calculation;N, N-dimethyl acetamide   
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        发布时间：2022-08-16
      • Guantian Du
        Vol. 13, Issue 2, (1990)
        摘要：Cs2CrO4, CsI and CsF as target additives in Hiconex 834 source have been investigated. It is shown that adding Cs2CrO4 in suitable ratios can improve Cs coverage and obtain the effect of simultaneous spraying of O2. The intensities of Fe-, Ag- and Cu- ion beams are greater than those obtained with pure Fe, Ag and Cu targets, by 10, 6 and 3.5 times, respectively. Negative beams of halogens can be obtained conveniently by mixing corresponding Cs halides with metal to form sputter targets. In the Munich high current source, a Fe target with an admixture of 5% Fe2O3 produces about twice the Fe- beam current as compared to that from a pure Fe target.  
        关键词：Target additives;Sputter negative ion source   
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        发布时间：2022-08-16
      • Yongyi Lu
        Vol. 13, Issue 2, (1990)
        摘要：A non-intercepting beam monitor system for the 20 MeV linear electron accelerator at Nanjing University was developed. The system includes some magnetic cores, a preamplifier, a pulse selector and a beam integrator.The experimental results have indicated that the system has good linearity with low distortion of waveform. The precision of measurement is better than ±5%.  
        关键词：Linear electron accelerator;Beam monitor;Accumulating charge;Beam transformer   
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        发布时间：2022-08-16
      • Dengke Che,Chengfu Xie,Cundi Lei,Shiquan Zhu,Chengde Gong
        Vol. 13, Issue 2, (1990)
        摘要：This paper describes the block diagram, function and control effects of a control system built with a microcomputer-fiber optics closed loop for controling the ion beam of a 150 kV neutron generator.  
        关键词：Lightwave communication;Master-slave system;Search adjustment;Real-time value   
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        发布时间：2022-08-16
      • Wenbing Zeng
        Vol. 13, Issue 2, (1990)
        摘要：In this paper, the construct of the beam splitting arrangement between SFC and SSC has been demonstrated. The parameters of physical design are given, and related calculating methods of beam transport have been stated briefly.  
        关键词：Septum magnet;Analogue computer;phase diagram;Beam envelope   
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        发布时间：2022-08-16
      • Nianxin Tang
        Vol. 13, Issue 2, (1990)
        摘要：Plastic scintillation cups have been used for measuring high energy beta rays emitted by 32P and 86Rb in solid vegetable samples. This method, has many advantages, such as high counting efficiency, simple specimen preparation and convenient operation.  
        关键词：Plastic scintillation cup method;Vegetable solid sample;G-M tube method   
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        发布时间：2022-08-16
      • Bin Gong,Qizhong Mo,Jun Fang,Pingchu Xu,Jumei Wang,Xingwei Kuang,Rong Chen
        Vol. 13, Issue 2, (1990)
        摘要：Experiments showed that Rt of α1 and DA receptors decreased in cerebral cortox of senile rats as compared with young rats. But for the senile rats taking the Traditional Chinese Medicine Guzhen recipes for 4 months the above Rt values were obviously incseased, which implied that the recipe had some function of delaying cerebral senility.  
        关键词：Radio-ligand binding assay;Neurotransmitter receptor;Traditional Chinese Medicine of tonifying the shen and the deficient essence;Concentration of ligand receptor complex(Rt);Equilibrium dissociation constants(Kd)   
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        发布时间：2022-08-16
      • Liren Shao,Xirui Zhou,Guohui Chen,Weiliang Wu,Gang Huang,Huiyang Zhao,Ainuo Yuan
        Vol. 13, Issue 2, (1990)
        摘要：3-(p-Trimethylaminoethyl)-phenylpropane - 2, 3-dione-bis-(N-methyl - thiosemicarba-zone)-iodide (p-TPA-DTS) was synthesized by methylation of aminoethylbenzene, followed by propionylation, nitrosation, reaction with methylth iosemicarbazide and quarternization. Tc-99m-complex of this compound was prepared by stannous chloride reduction of sodium pertechnetate in aqueous at pH 3. Tc-99m-p-TPA-DTS possessed a clear myocardial image and rapid hepatocellular transit in rabbits.  
        关键词：Myocardial imaging agent;Tc-99m-P-TPA-DTS   
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        发布时间：2022-08-16
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