最新刊期
      卷 0 ， 期 0 ， 2020
      • Linzhou Wang,Lili Li
        Vol. 12, Issue 6, (1989)
        摘要：The gas amplification characteristic curves were given in proportional, saturated avalanche and SQS regions. Besides the second transition of SQS mode, the dead zones were measured for different gases and proportions. The lifetime test of the detector operated in SQS mode was also performed.  
        关键词：Second transition;Dead time;Ineffective length;Dead zone;Sputter;Corrosion;Whisker   
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        发布时间：2022-08-16
      • Jilian Tan,Ximing Liu,Enjie Fan,Jinxia Zhang,Guiju Fan
        Vol. 12, Issue 6, (1989)
        摘要：A bidimensional transmission position sensitive avalanche chamber with sensitive area of 100×100 mm2 has been developed. The electric field distribution inside the chamber is calculated. The properties of the detector are tested by operating the detector in flowing isobutylene gas at a pressure of 360 Pa and using 252Cf spontaneous fission source. A time resolution of 280 ps (FWHM) and position resolutions of 3.7 mm in x-coordinated axis and 4 mm in y-coordinated axis are obtained.  
        关键词：Bidimension;Transmission;Avalanche;Electric field   
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        发布时间：2022-08-16
      • Shanming Rong,Qichang Zhou,Ruifen Zhang,Yunlin Wang,Huimin Wang,Liangjiu Wang
        Vol. 12, Issue 6, (1989)
        摘要：Model HHF-301 system is equipped with a high-performance β-ray sensor, a high precision "O" frame scanner and a dedicated microprocessor. In comparison with the conventional β-ray basis weight gauge this intelligent system features its superior accuracies of calibration and of on-line measurement reaching to ±0.1% and to ±0.25% respectively, which is based upon a polynomial exponential calculation of basis weight, accurate compensations for various on-line measuring errors, and a specially designed software. Its operation over one year at Beijing No.1 Paper Mill has proved that this system is of high stability and reliability.  
        关键词：Intelligent system;β-ray sensor;Paper making   
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        发布时间：2022-08-16
      • Zhengyong Feng
        Vol. 12, Issue 6, (1989)
        摘要：The attenuation of natural γ-radiation of shales passing through coal medium in mine was studied using Monte-Carlo method. The intensities, energy spectra, and angle distributions of γ-radiation on the surface of coal seams with different thicknesses were calculated. The attenuation of γ-ray in this case was found to be different from that in the case with narrow monoenergy beam. The total intensity of γ-rays decreases obviously with the thickness up to 20 cm, and slowly above the thickness. But the intensity for γ-rays in low energy region changes still rather obviously even for greater thickness.  
        关键词：Coal mine;Thickness measurement;Natural;γ-radiation Monte-Carlo method   
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        发布时间：2022-08-16
      • Guoping Feng,Binghua Su,Shide Zhang,Zongqin Xia
        Vol. 12, Issue 6, (1989)
        摘要：A new data processing program for RIA was introduced. The new rooust fitting method, and new methods for error analysis and quality control data analysis were discussed. The robustness of three standard curve fitting methods, i.e. robust and least square mass action model and 4 parameter logistic model was also compared.  
        关键词：Radioimmunoassay;Data processing;Mass action model;Quality control;Robust fitting   
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        发布时间：2022-08-16
      • Keming Zhan,Jianming Yuan,Xiaoma Jiang
        Vol. 12, Issue 6, (1989)
        摘要：In 1H NMR spectra, cis-butenedioic acid differs from the trans-isomer in singlet peaks. The difference between their chemical shifts reaches to 0.42 ppm. With the help of dynamic NMR (DNMR) , the photochemical isomerization of trans- and cis-butenedioic acid under irradiation of 253.7 nm ultra-violet rays and the thermal isomerization of maleic acid at 138℃ are described.  
        关键词：Dynamic NMR (DNMR);Photochemical tautomerization;Maleic acid;Fumaric acid   
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        <引用本文> <批量引用> 28340151 false
        发布时间：2022-08-16
      • Gongxiang Zhang,Yunmin Sun,Qingrong Rao
        Vol. 12, Issue 6, (1989)
        摘要：A stripper holder with 60 foils has been designed and has been used in the beam line of HIRFL. The vacuum in the cavity is better than 13.3 µPa, and carbon foils can withstand a high positive voltage up to 150 kV. The gears in the planetary system can be driven smoothly with no shock. The deviation between the central axes of the foils and the beam line is within 1 mm. Basically the stripper has met the requirement both in physical and in mechanical designs.  
        关键词：Stripper;Stripping carbon foil;Planetary gear system;Rotational sealer   
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        <引用本文> <批量引用> 28340153 false
        发布时间：2022-08-16
      • Yingmei Wang,Fanan Zeng
        Vol. 12, Issue 6, (1989)
        摘要：Based on some assumptions and the multiple scattering Xα method, calculations are carried out for the Na3 cluster which were thoroughly investigated by the CI-SCF and LSD pseudopotential method. The statistical total energy, orbit energy and ionization energy of the Na3 cluster are reported. Some advantages and limitations of the method are discussed in light of these results.  
        关键词：Multiple scattering Xα method;Overlapping atomic sphere;Muffin-tin approximation;Norman rule   
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        <引用本文> <批量引用> 28340158 false
        发布时间：2022-08-16
      • Zikang Shi,Shubing Yang
        Vol. 12, Issue 6, (1989)
        摘要：Two samples plated with ZnS film by different technologies and heat-treated under different conditions are studied by. positron annihilation. The applied method to the optical medium film is introduced in detail. The possible film structure and the improvement of film quality are discussed.  
        关键词：Positron annihilation;Plating;Optical medium film   
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        发布时间：2022-08-16
      • Shouzhen Han,Naifeng Mao,Gongpan Li,Zhaosheng Yin
        Vol. 12, Issue 6, (1989)
        摘要：An analytical-numerical calculation method for the shaping of an axial-symmetrical and radial-inhomogeneous magnetic field is introduced. The shaping calculation of the radial inhomogeneous magnetic field for a 3He/4He mass spectrometer was completed by using this method, and the deviations of the real magnetic field from the desired one are less than 1×10-4.  
        关键词：Radial inhomogeneous magnetic field;Analytical-numerical method;Conical pole surface;Annular shim;Magnetic field shaping   
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        发布时间：2022-08-16
      • Zhizhen Yang,Changzhou Ye,Zhenghua Zhu,Zhenhua Wu
        Vol. 12, Issue 6, (1989)
        摘要：This peper describes a new calibration method for β-radioactive gas densimeter (β-flow counter) , i.e. the escape method of a leaking electronic device. The new method allows the calibration of many divisions in one run and provides the convenience in operation.  
        关键词：85Kr leak test;Molecular flow mechanism;Gas escape   
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        <引用本文> <批量引用> 28340213 false
        发布时间：2022-08-16
      • Yingqiang Chen,Qingwen Zhang,Chao Lin,Fuwen Tan
        Vol. 12, Issue 6, (1989)
        摘要：The radon-tightness of ABS polymer cup was tested with the emanation method. The radon escape rate for the cup was found to be less than 0.01%.  
        关键词：ABS polymer;Radon;Tightness   
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        <引用本文> <批量引用> 28340214 false
        发布时间：2022-08-16
      • Tingqing Zhang,Jialu Liu,Xiangming Li,Yubo Wen,Donghong Li
        Vol. 12, Issue 6, (1989)
        摘要：It is proposed that double acceptor-level vacancies are responsible for arsenic diffusion in silicon. The diffusion equation is solved using the Crank-Nicolson differential method. A computer program is used to calculate diffusion coefficient and diffusion distribution of arsenic implanted into silicon. The results on diffusion distribution and junction depth are compared with the SRP measured profiles and the SUPREM-II simulation. A good agreement with the measured values has been observed.  
        关键词：Arsenic implantation;Computer simulation   
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        <引用本文> <批量引用> 28340223 false
        发布时间：2022-08-16
      • Shangren Pan,Hesheng Shao,Xinan Jing,Weiyi Li,Yingying Feng,Lanqin Yin,Qinfang Kuang
        Vol. 12, Issue 6, (1989)
        摘要：The [2-14C] carbendazol was administered to rats 60 mg/kg PO. The biological half-life was 1.1 h and was 4.6 h. Radioactivities reached to the highest in liver after 48 h. The percentage of dose excreted was 63% in urine and 30% in feces within 48 h. The metabolites were checked by TLC and radioautography of the urine.  
        关键词：[2-14C] carbendazol;Rat;Biological half-life;Distribution;Excretion;Metabolite   
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        发布时间：2022-08-16
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