4 resultados para ddc: 153.152

em Chinese Academy of Sciences Institutional Repositories Grid Portal


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用蒸发中子反应产生~(157)Tb和~(153)Er,收集活性样品,作x, #gamma# 单谱及符合谱测量,对~(157)Yb和~(153)Er的(EC+#beta#~+)衰变进行了研究,给出了~(157)Yb及~(153)Er的衰变纲图,其中~(157)Yb的衰变纲图包括25条新#gamma#射线,分析~(157)Yb的衰变纲图,~(153)Er的衰变纲图包括15条#gamma#射线,并指定出~(153)Er半衰变期值,该值与文献给出值符合得很好。指定了~(153)Er的衰变纲图中能级状况

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利用142Nd(16O,5n)153Er和147Sm(16O,6n)157Yb反应并藉助与氦喷嘴快速带传输装置和x(γ) γt-符合测量技术首次建立了153Er和157Yb的(EC/β+)衰变能级纲图。 对153Er的(EC/β+)衰变纲图的分析,得到结果有, 1) 辨认了256.7KeV和634.2KeV的二条低位能级分别为d3/2和d5/2的单质子态。因此,153H0的基态 的形状为球形。在同位素链Ho(Z=67)上,随着中子数的增加,奇质量数Ho核的基态核形状由球形过渡到变形发生在中子数86和88之间。 2) 位于1700.1KeV能级为三粒子态,具有[(πh11/2 νh9/2)1+ νf7/2] , , 的结构特征。 经对157Yb的(EC/β+)衰变纲图分析,得到结果有, 1) 发现了建立在157Tm基态上的Kπ= 转动带的带头部分。用可变转动惯量的三轴行变粒子转子模型对157Tm的转动能谱的计算结果表明,157Tm的基态Kπ= 转动带所对应的形变是三轴形变,相应的形变参数为ε2=0.23,ε4=0.01,γ=35°。给出了随着中子数的增加,奇质量数Tm(Z=69)核的基态核形状由球形过渡到非球形发生在中子数86和88之间。 2) 辨认了一条位于激发能为3502KeV的同质异能态,其寿命>40ns。

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<正>2009年12月召开的联合国哥本哈根气候变化会议上围绕如何应对气候变化问题的争论实质上是关于未来发展道路和发展权力的争论。哥本哈根会议再次显示,发达国家通过把对气候变化的科学认识转变为政治共识而在国际气候变化事务中占有更多的话语权。但作为政治共识的气

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The heat capacities (C-p) of five types of gasohol (50 wt % ethanol and 50 wt % unleaded gasoline 93(#) (E50), 60 wt % ethanol and 40 wt % unleaded gasoline 93(#) (E60), 70 wt % ethanol and 30 wt % unleaded gasoline 93(#) (E70), 80 wt % ethanol and 20 wt % unleaded gasoline 93(#) (E80), and 90 wt % ethanol and 10 wt % unleaded gasoline 93(#) (E90), where the "93" denotes the octane number) were measured by adiabatic calorimetry in the temperature range of 78-320 K. A glass transition was observed at 95.61, 96.14, 96.56, 96.84, and 97.08 K for samples from the E50, E60, E70, E80, and E90 systems, respectively. A liquid-solid phase transition and a solid-liquid phase transition were observed in the respective temperature ranges of 118-153 and 155-163 K for E50, 117-150 and 151-164 K for E60, 115-154 and 154-166 K for E70, 113-152 and 152-167 K for E80, and 112-151 and 1581-167 K for E90. The polynomial equations of Cp and the excess heat capacities (C-p(E)), with respect to the thermodynamic temperature, were established through least-squares fitting. Based on the thermodynamic relationship and the equations obtained, the thermodynamic functions and the excess thermodynamic functions of the five gasohol samples were derived.