一种新的金属压缩试验方法的有限元分析

对一种新的金属压缩试验方法进行了有限元数值分析，论证了这种方法的可行性和有性，并且对不同尺寸的试件进行了有限元计算．     

关于数学中的公理化方法

公理化方法(以下简称公理法)的广泛使用,是现代数学的一大特点。 一、公理化方法的沿革 数学中的公理法起源于欧几里得的《几何原本》(或简称《原本》)。欧几里得基于当时所积累的丰富的几何事实,把一些基本概念(点、线、平面)加以定义,而后选择一些几何的基本命题叫做公理(欧氏     

基于蒙特卡罗随机有限元方法的随机多孔介质内流体自然对流不确定性研究

为分析孔隙率不确定性对多孔介质方腔内自然对流换热的影响,发展了一种基于KL（Karhunen-Loeve展开）-蒙特卡罗随机有限元算法的随机多孔介质内自然对流不确定性分析数理模型及有限元数值模拟程序框架。通过K-L展开及基于拉丁抽样法生成多孔介质孔隙率随机实现,并耦合多孔介质自然对流有限元程序,进行随机多孔介质内自然对流传热数值模拟,得出了多孔介质内流场与温度场平均值与标准偏差,并分析了孔隙率不确定性条件下Da数对Nu数的影响。结果表明,孔隙率不确定性对多孔介质方腔内自然对流有重要影响。随机多孔介质内流场及温度场与确定性条件下的流场及温度场存在一定偏差,Nu数标准偏差随着Da的增大先增大后减小。     

方钢管混凝土框架抗震性能及P-Δ效应研究

为了对方钢管混凝土框架的抗震性能及P-Δ效应进行研究,设计制作了1榀方钢管混凝土框架进行低周反复加载试验。研究表明:方钢管混凝土框架试件的滞回曲线呈饱满的梭形,破坏时的等效黏滞阻尼系数为0.2241,表明该框架结构具有良好的抗震耗能性能;试件在正负向的平均位移延性系数为2.94,表现出了较好的延性性能;破坏时的平均位移转角为1/36,表现出了较强的抗倒塌能力;随着加载位移的增加,试件的残余变形及等效黏滞阻尼系数均会逐渐增大,而强度衰减幅度总体上呈现出先增大后减小的变化趋势,刚度退化速率呈现出先快后慢的变化趋势。最后基于试验数据,对P-Δ效应的影响进行了分析,提出了相关建议。上述结果可为相关的工程应用及理论分析提供参考。     

三硼酸铋(BiB3O6)晶体研究综述

本文综述了人们近年来对BiB3O6(BIBO)晶体生长、结构和性能等所取得的研究成果,通过多学科和多参数综合性质的研究,说明了BIBO晶体是一种新型高效非线性光学晶体.但作为一种新型高效非线性光学材料,有关BIBO的研究尚属于早期阶段,为了获得广泛的应用,应当进一步研究.     

镧-依文思蓝-氨基糖苷类抗生素的显色反应及其分析应用

分光光度法;镧-依文思蓝-氨基糖苷类抗生素的显色反应及其分析应用     

CENOZOIC VOLCANIC ROCK SERIES IN SOUTHEASTERN CHINA——PETROCHEMISTRY

In this paper, the age, spatial distribution and petrochemistry of Cenozoic volcanic rocks of southeastern China are discussed. They are subalkalic and alkalic. Except for the Pleistocene calc-alkalic volcanic rocks of northern Taiwan and the Late Tertiary tholeiitic rocks of Eastern Coastal Range of Taiwan, the alkalic basaltic rocks form the majority. Only alkalic and strongly alkalic basaltic and ultrabasic volcanic rocks occur in the inland to the west of the Haifeng-Zhenghe-Shangyu fracture zone. It follows that the petrochemical nature of the Cenozoic volcanics studied exhibits a marked trend of variation with time and space, implying that their formation was obviously controlled by the geotectonic setting.     

CENOZOIC VOLCANIC ROCK SERIES IN SOUTHEASTERN CHINA (Ⅱ)——TRACE ELEMENT GEOCHEMISTRY

On the premise of the sister paper, the trace element geochemistry of Cenozoic volcanic rocks of southeastern China is discussed in detail in this paper. The data presented in this paper indicate that the upper mantle beneath the area studied is enriched in the strongly HYG elements as compared with the chondritic mantle, and that the depth of Cenozoic basaltic magma sources progressively increases from the coast to the inland. The Cenozoic basaltic volcanism has occurred in a geotectonic setting of rifting continental margin; on the contrary, the Mesozoic volcanic rocks are predominated by the felsic volcanics erupting in a geotectonic setting of active continental margin. It can be inferred from the studies of ultramafic inclusion-derived geotherm that the Cenozoic rifting of eastern China continent has been mainly controlled by the thermal mantle diapirism.