最新刊期
      卷 0 ， 期 0 ， 2020
      • Zhang Jiahua
        Issue 12, (1991)
        摘要：The thorium uranium-233 thermal-neutron breeder reactor is a conceptive and perspec-ive reactor. In this article the well established thermal-neutron cross-sections are employed study the consumption of thorium and the generation of 233U, in order to better unders-and the physical properties of such reactor. Upon the assumption that the period of uel changing is not shorter than the time for the induced 233U to reach its saturation toncentration, it turns out that the reactor apparently possesses the physical properties: 1, high thorium consumptivity, 2. high neutron flux operation preferable; 3. low input 233U-Th ratio and 4. high fuel burn-up.  
          
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        发布时间：2021-04-20
      • Cheng Huansheng Li Xiangyang Yang Fujia
        Issue 12, (1991)
        摘要：Cross sections for 165° backscattering of 4He ions from Na and AI films at energies in the range of 2.0-6.0 MeV have been measured. The cross sections were measured with a maximum interval of 50 keV and typical uncertainties of ±2.5%. Experimental results show that, for sodium and aluminum the upper energies at which the backscattering cross section can still be predicted by Rutherford scattering formula, are3.0 MeV and 3.5 MeV, respectively. When energe is higher than the upper value, the backscattering cross section shows a continuous nuclear resonance distribution both for sodium and for aluminum.  
          
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        发布时间：2021-04-20
      • Qiu Wanchuan Gan Fuxing Yao Luan
        Issue 12, (1991)
        摘要：Positron lifetime in divacancy in de-alloyed arsenic doped brass, H62As, has been measured. This can be regarded as a more direct experimental evidence for the divacancy mechanism of preferential dissolution for brass. The mechanism of resisting preferential dissolution for arsenic doped brass has also been discussed.  
          
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        发布时间：2021-04-20
      • Liu Wenhong Zhang Guilin Hu WenxiangXu Feng Zhang Yiping Ron Tingwen
        Issue 12, (1991)
        摘要：The 57Fe Mossbauer resonance has been applied to study the temperature dependence of dopant states in polyacetylene films doped with different amount of FeCl3. For the sample with 1% FeCL3, FeCL4- and FeCl4- （1<△<2） are observed at RT , while for that with 5.75% FeCl3, FeCl42- is also found. These components can transform from one to another when temperature changes in the range of RT to 208K.  
          
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        发布时间：2021-04-20
      • Sun Biehe Chen Qin
        Issue 12, (1991)
        摘要：The production of several kinds of intense beam and their characteristics of beam extraction from the duoplasmatron source are studied. The hydrogen, helium, nitrogen and argon beams thus produced were analyzed and their mass spectra were measured. A brief discussion on the production of multieharged ions in the duoplasmatron source and on the beam emittance was made as well.  
          
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        发布时间：2021-04-20
      • Yang Jinfeng Bao Borong Wang Gaodong Qian Jun
        Issue 12, (1991)
        摘要：The high-temperature gas-cooling reactor （HTGR） is an advanced converter reactor operated by using thorium/uranium cycle and utilizing 93% 235U-enriched or 20% 235U-enriched uranium and thorium as fissile fuel. In this paper, two fuel cycles of the HTGR, i. e. once-through and recycle, have been investigated. The early stage costs of fuel and fuel cycle were calculated. Effects of natural uranium, enrichment, reprocessing and fabrication of the Th-U recycle fuel on price variation were studied.  
          
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        <引用本文> <批量引用> 8933292 false
        发布时间：2021-04-20
      • Tan Fujin
        Issue 12, (1991)
        摘要：The vacuum annealing curves of Ti and （Ti + N） implanted H13 steel specimens are presented for the first time. The optimum of annealing temperature is about 500℃. For as-implanted specimens the compounds Fe2Ti and Fe2N have been observed by X-ray diffraction analysis. After annealing at 500℃, these compounds still exist in implanted layers, thus increasing the hardness of the H13 steel.  
          
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        发布时间：2021-04-20
      • He Chengfa Zhou Guangwen Wei Xizhi
        Issue 12, (1991)
        摘要：Damage sensitivity, a characteristic parameter in the study of ionizing radiation damage equivalence in CMOS devices, is a complex function of total dose, dose rate, radiation source, particle energy, supply voltage, gate bias and transistor type. In this paper mainly reported is the responses of total dose and dose rate. Under our experimental conditions, it is found that damage sensitivity for CMOS devices is almost independent of total dose and only have a weak dependence on dose rate.  
          
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        发布时间：2021-04-20
      • Yu Songsheng Wu Qinghua
        Issue 12, (1991)
        摘要：The tritium content is measured in underground water from the basin side-band of the East-Mountain Region of Taiyuan, Shanxi Province, and hence the age, i. e. resident time, of underground water is estimated. The region belongs to deep water-poor zone in a long loess ridge situated in a loess hill plateau. The level of underground water is 40-80 m deep hidden. In the runway and the scouring channel the aqueous bed is of river pebble and cobble, with a level of 2-10m in depth. The age of underground water from different wells were determined to be 23a, 14a, 25a, 41a and 53a respectively.  
          
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        <引用本文> <批量引用> 8933284 false
        发布时间：2021-04-20
      • Yang Kunshan Liu Zhengmin Ma Shuxun Liu Zhaoyuan
        Issue 12, (1991)
        摘要：Samples of human cerebrospinal fluid （CSF） have been investigated by PIXE analysis. Trace elements of K, Ca, Cr, Mn, Fe, Ni, Cu, Zn and Br were determined from observed X-ray spectra. Elemental concentrations in CSF samples from men without brain disease and from patients with brain disease have been compared. The variation of elemental concentrations in CSF samples, taken from patients before and after paraplegia surgery, was also studied.  
          
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        发布时间：2021-04-20
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