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总结了中国地震学会2000年的工作，内容包括中国地震学会2000年的学术交流活动、组织工作和科学普及工作；介绍了中国地震学会2001年来的学术活动计划。 相似文献
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动态储量计算系统的设计与实现 总被引：1，自引：1，他引：0
针对储量计算与汇总工作中繁琐、费时、易出错、反复修改、工作量大的特点,本文给出了一个动态储量计算系统Rescom的总体设计思想与实现方法,Rescon对变化的煤层块段、复杂的汇总项目能快速地计算出精准结果,灵活地输出美观的表格. 相似文献
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In this study, the practical methodologies are described for the determination of the factors for the self-absorption effect (Fs), spectral interferences (Fcsi), and true coincidence summing effects (Fcoi), which are used in direct gamma-spectrometric measurement of radionuclides such as 210Pb, 238U, 234Th, 226Ra, 214Pb, 228Ac, 208Tl, 214Bi, 137Cs and 40K in samples. To validate the applied methods, certified reference materials (CRMs) of lake and stream sediments were measured with an n-type Germanium (Ge) detector-calibrated using a multinuclide reference source. The highest self-absorption correction factors ranged from Fs = 1.44–2.10 for 46.5 keV peak (210Pb) and Fs = 1.25–1.60 for 63.3 keV peak (234Th) lying in the low energy region of the spectrum. The systematic influence was observed for 186.2 keV (226Ra) peak due to spectral interferences with the 235U contribution. For this peak, Fcsi is changed from 0.921 to 0.955. Additionally, the present study suggests that true coincidence summing (TCS) effects are not dominant, except for 208Tl and 214Bi for which Fcoi ranged from 1.179 to 1.192 an ranged from 1.140 to 1.151, respectively. 相似文献
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