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研究了激光惯性约束聚变(ICF)实验中一种基础基准靶埋点靶的制备工艺过程.埋点靶的制备过程主要包括CH膜的制备、埋点的定位和埋点材料的制备.其中,CH薄膜的制备及其性质是制备埋点靶的关键工艺环节.最后给出了埋点靶的制备工艺流程. 相似文献
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对同位素Ni靶的制备工艺进行了研究。通过对电沉积过程中影响靶膜生长质量的因素与靶膜厚间的关系实验,确定出最佳制备工艺条件。用最佳工艺条件制备出了品质优良的大面积Ni同位素自支撑靶膜。 相似文献
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采用电沉积法对加速器生产109Cd所用Ag靶的制备工艺进行研究。实验研究了电沉积过程中影响Ag靶层质量及厚度的主要因素,确定了Ag靶制备工艺条件和工艺参数:ρ(Ag )=20~50 g/L,ρ(KNO3)=10~30 g/L,φ(NH4OH)=0.1~0.2;电流密度10~15 mA/cm2,电沉积时间2~3 h,室温。用此工艺条件制备出靶厚大于100 mg/cm2、表面光滑、镀层致密的Ag靶。 相似文献
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对加速器生产111In所用镉靶制备工艺进行了研究.通过研究电沉积过程中影响Cd靶质量及厚度的各种因素,确定了最佳工艺条件.所研制的镉靶厚度大于57 mg/cm2,表面光亮、致密、牢固. 相似文献
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Using the standard radiometers -GUARD PQ2000M and gamma-TRACER (Germany) and semiconductor spectrometers RATON (Uzbekistan), the radon fields were investigated in underground service enclosures and on the platforms of the Tashkent subway stations located on territories with different geotectonic characteristics. It is shown that the tectonic factor influences the formation of radon fields in the air in the subway station. 4 figures, 1 table, 7 references. 相似文献
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氡在氡室中是一种动态稳定状态,为了更准确的监测氡室中氡浓度的变化,文章主要对氡室首次补氡期间氡及子体的平衡状态的变化进行理论推导和平衡系数对FD125监测曲线的影响进行了探讨并进行了修正,取得了比较好的效果,为氡室氡浓度监测曲线修正提供了一种方法. 相似文献
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《Annals of Nuclear Energy》2002,29(16):1933-1951
The possibility of using the standard conjugate gradient (CG) method to directly solve the Sn-equations based on the diamond difference scheme is studied for mono-energetic neutron transport problems with isotropic scattering. It is shown that such a direct use is possible for practical heterogeneous problems with a significant speed-up over the conventional source iteration (SI) method except for the problems that are prone to unphysical negative fluxes. Some recipes are suggested to make use of the CG-method even in those cases which need negative flux fix-up in the SI-method. The transport synthetic acceleration scheme, recently developed by Ramone [Nucl. Sci. Eng. 125 (1997) 257] and others, is shown to be useful in such cases. A symmetrisation scheme for the coefficient matrix has also been presented to enable the use of the CG-method. This scheme is compared with another approach of using weighted inner products. 相似文献
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