解任意轴对称载荷作用下弹性圆板大挠度问题的修正动力松弛法

本文用作者提出的修正的动力松弛方法,求解了任意轴对称载荷作用下弹性圆板的大挠度弯曲问题,并与相应的摄动解作了比较。结果表明,修正的自适应动力松弛方法用于解非线性问题具有较大的潜力。     

基于TOPSIS法的运动员攻防能力指标评价研究

运用TOPSIS分析法对2016年里约奥运会中国队与对手攻防能力指标进行定量分析,为中国男篮训练提供评价标准。研究认为,在进攻能力方面,美国队、澳大利亚队和法国队的进攻Ci值超过了0.5,属于进攻能力较强的队伍;而委内瑞拉、塞尔维亚和中国队的进攻Ci值则低于0.5,进攻能力相对较为弱一些。在防守能力方面,美国队、澳大利亚队、法国队、委内瑞拉、塞尔维亚和中国队的防守Ci值均超过了0.5,属于防守能力较强的队伍。美国队、澳大利亚队和法国队的攻防Ci值均超过了0.5,属于综合实力较强的队伍;而委内瑞拉、塞尔维亚和中国队的攻防Ci值均在0.5以下,攻防能力相对较弱。     

输气管线压气站站距计算

本文论述输气管线压气站站距的计算方法。以输气量公式为依据,推导出全线等量输送、非等量输送情况下的站距公式。适用于布置压气站的计算。     

NECP-Atlas不可辨共振能区概率表模块的开发和验证

核数据处理是连接评价核数据库和中子输运程序的重要接口,其中对不可辨共振能区的处理是核数据处理的关键技术点之一。不可辨共振能区的共振峰极为密集,在物理计算中必须考虑其共振自屏效应,概率表方法是获得不可分辨能区自屏截面的常用方法。Ladder Sampling方法是目前使用最广泛的概率表产生方法,该方法通过构造随机共振序列等效真实共振结构来统计概率表。基于Ladder Sampling方法在NECP-Atlas程序中开发了概率表计算模块,对计算过程中的复误差函数计算、卡方随机数产生、概率表划分、共振公式选取、Ladder数目以及排序算法进行了敏感性分析,最终确定了最优的计算方法,实现了概率表的精确、高效效率。      

Three-dimensional core analysis on a super fast reactor with negative local void reactivity

Keeping negative void reactivity throughout the cycle life is one of the most important requirements for the design of a supercritical water-cooled fast reactor (super fast reactor). Previous conceptual design has negative overall void reactivity. But the local void reactivity, which is defined as the reactivity change when the coolant of one fuel assembly disappears, also needs to be kept negative throughout the cycle life because the super fast reactor is designed with closed fuel assemblies. The mechanism of the local void reactivity is theoretically analyzed from the neutrons balance point of view. Three-dimensional neutronics/thermal-hydraulic coupling calculation is employed to analyze the characteristics of the super fast reactor including the local void reactivity. Some configurations of the core are optimized to decrease the local void reactivity. A reference core is successfully designed with keeping both overall and local void reactivity negative. The maximum local void reactivity is less than −30 pcm.     

基于MOREL2.0对石墨慢化熔盐堆的稳态分析

熔盐堆采用熔融的氟化盐混合物作为燃料和堆芯的冷却剂,由于燃料的流动,熔盐堆在中子学和热工水力学方面与传统固体燃料反应堆有着较大区别。本文基于熔盐堆分析程序MOREL2.0对钍基熔盐堆（TMSR）初步堆芯设计方案进行了稳态计算分析,结果表明：燃料流动对缓发中子先驱核的分布影响较大,并导致169 pcm反应性损失;随燃料在外部回路中滞留时间的增加,k_eff降低,80 s后趋于平稳;TMSR具有负的入口燃料温度系数,具有固有安全性。     

氮源对利迪链菌素生产及相关次级代谢物分布的影响

The effects of nitrogen sources on streptolydigin production and distribution of secondary metabolites were investigated for flask cultured S.lydicus AS 4.2501.When peptone,asparamide,and glutamic acid were ex- amined as the nitrogen source,respectively,liquid chromatography-mass spectrometry（LC-MS）and photodiode array（PDA）analyses revealed the formation of two analogues of streptolydigin in the fermentation broth.When soybean meal was used as the source of nitrogen,three analogues of streptolydigin were detected.The use of am- monium sulfate as a source of nitrogen resulted in a lower pH value of the fermentation system,thus inhibiting streptolydigin biosynthesis and changing the metabolic profiling.Among the nitrogen sources that were made use of,glutamic acid was most favorable to the formation of streptolydigin.Simultaneously,this study also showed that the changing nitrogen sources resulted in altering the production and relative ratios of streptolydigin and its analogues.     

Transmission probability method for solving neutron transport equation in three-dimensional triangular-z geometry

This paper presents a transmission probability method (TPM) to solve the neutron transport equation in three-dimensional triangular-z geometry. The source within the mesh is assumed to be spatially uniform and isotropic. At the mesh surface, the constant and the simplified P₁ approximation are invoked for the anisotropic angular flux distribution. Based on this model, a code TPMTDT is encoded. It was verified by three 3D Takeda benchmark problems, in which the first two problems are in XYZ geometry and the last one is in hexagonal-z geometry, and an unstructured geometry problem. The results of the present method agree well with those of Monte-Carlo calculation method and Spherical Harmonics (P_N) method.