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基于晶体三极管的不同中子能谱等效性实验研究 被引量:3
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作者 鲁艺 邱东 +1 位作者 邹德惠 荣茹 《核技术》 CAS CSCD 北大核心 2014年第6期60-65,共6页
辐射损伤等效性系数是评价不同中子能谱对样品的实验损伤差异的关键。利用晶体管直流增益的倒数与中子注量呈线性关系这一特点,采用参数一致性好的硅双极晶体管3DG121C作为位移损伤探测器,通过在线监测晶体管直流增益随累积中子注量的变... 辐射损伤等效性系数是评价不同中子能谱对样品的实验损伤差异的关键。利用晶体管直流增益的倒数与中子注量呈线性关系这一特点,采用参数一致性好的硅双极晶体管3DG121C作为位移损伤探测器,通过在线监测晶体管直流增益随累积中子注量的变化,分别获得了CFBR-II堆两个特定位置的损伤常数,推导出了不同中子能谱间的辐射损伤等效系数。结果表明,CFBR-II不同位置的辐射损伤没有显著差异。 展开更多
关键词 辐射效应 损伤常数 等效性系数 硅双极晶体管 快中子临界装置
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中国大陆及邻区岩石圈三维流变结构 被引量:59
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作者 孙玉军 董树文 +2 位作者 范桃园 张怀 石耀霖 《地球物理学报》 SCIE EI CAS CSCD 北大核心 2013年第9期2936-2946,共11页
依据地震波速得到的上地幔温度和气象台站记录的地表温度为约束,结合地表热流和热导率观测数据,利用有限元方法计算了中国大陆及邻区岩石圈三维热结构.基于此温度结果和GPS观测得到的应变率数据,以滑动摩擦、脆性破裂和蠕变三种强度机... 依据地震波速得到的上地幔温度和气象台站记录的地表温度为约束,结合地表热流和热导率观测数据,利用有限元方法计算了中国大陆及邻区岩石圈三维热结构.基于此温度结果和GPS观测得到的应变率数据,以滑动摩擦、脆性破裂和蠕变三种强度机制为约束,计算得到了中国大陆及邻区岩石圈三维流变结构.结果显示:弱强度和低等效黏滞性系数的下地壳在中国大陆及邻区普遍存在,并且下地壳的流变强度和等效黏滞性系数比上地壳和岩石圈地幔一般要低1~2个数量级;中国大陆范围内青藏高原存在着厚度最大、强度最低的下地壳;青藏高原的岩石圈强度和等效黏滞性系数比华北、华南和印度板块的都要低;岩石圈流变结构的横向分布特征与重力梯度带和地形过渡带比较一致. 展开更多
关键词 中国大陆及邻区 岩石圈 流变结构 等效黏滞系数
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Distribution of acceleration and empirical formula for calculating maximum acceleration of rockfill dams
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作者 周晖 李俊杰 康飞 《Journal of Central South University》 SCIE EI CAS 2010年第3期642-647,共6页
To find the distribution patterns of dynamic amplification coefficients for dams subjected to earthquake, 3D seismic responses of concrete-faced rockfill dams with different heights and different shapes of river valle... To find the distribution patterns of dynamic amplification coefficients for dams subjected to earthquake, 3D seismic responses of concrete-faced rockfill dams with different heights and different shapes of river valley were analyzed by using the equivalent-linear model. Statistical analysis was also made to the seismic coefficient, and an empirical formula for calculating the maximum acceleration was provided. The results indicate that under the condition of the same dam height and the same base acceleration excitations, with the increase of the river valley width, the position of the maximum acceleration on the axis of the top of the dam moves from the center to the riversides symmetrically. For the narrow valleys, the maximum acceleration occurs in the middle of the axis at the top of the dam; for wide valleys the maximum acceleration appears near the riversides. The result negates the application of 2D dynamical computation for wide valleys, and shows that for the seismic response of high concrete-faced rockfill dams, the seismic coefficient along the axis should be given, except for that along the dam height. Seismic stability analysis of rockfill dams using pseudo-static method can be modified according to the formula. 展开更多
关键词 concrete-faced rockfill dam 3D dynamical response analysis equivalent-linear method ACCELERATION seismic coefficient statistical analysis
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Performances of Flat Plate Pulsating Heat Pipes
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作者 W. Qu B. Yang 《Journal of Energy and Power Engineering》 2010年第8期1-8,共8页
Flat plate pulsating heat pipe is useful for hot spot heat spreader. Two kinds of flat plate spreader of pulsating heat pipe are designed, fabricated and experimented. For the embedded circular capillary type, the tra... Flat plate pulsating heat pipe is useful for hot spot heat spreader. Two kinds of flat plate spreader of pulsating heat pipe are designed, fabricated and experimented. For the embedded circular capillary type, the transferred heat flux could reach 32 W/cm2, the smallest thermal resistance for acetone, methanol and FC-72 were respectively 0.50, 0.57 and 0.40℃/W. While for the square capillary type, the transferred heat flux could reach 26 W/cm2, the equivalent thermal conductivity could reach 3211 W/(m. ℃). There are ranges of optimal transferred power and filling ratio for different working liquid. If the transferred power is constant, changing the heating area and the place has little effects on the performance. 展开更多
关键词 Pulsating heat pipe heat spreader the embedded circular capillary type the square capillary type heat flux.
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