Ladyzhenskaya模型的低阶三角形有限元方法

对定常Ladyzhenskaya模型提出了一种稳定化有限元法.给出了用低阶三角形元逼近时,有限元解的存在性、唯一性及收敛性的数字分析。     

火焰原子吸收光谱法测定荷叶中几种营养元素含量

本文采用火焰原子吸收光谱法测定了荷叶中K、Ca、Mg、Mn、Fe、Zn六种营养元素的含量。结果表明，K、Ca的含量较高，微量元素Mn、Fe、Zn的含量依次降低。方法回收率在97％-103．5％之间，相对标准偏差在0．70％-3．51％之间，测定结果对荷叶进一步综合开发利用提供了有用的数据。     

自适应有限元结合弧长法求解软化问题

将自适应有限元与弧长法迭代算法相结合，用于软化材料的弹塑性有限元计算．讨论了程序中软化材料的弹塑性计算、本构积分、弧长法迭代、自适应有限元，得到了自适应有限元与弧长法结合计算软化问题的流程图．算例分析结果验证了本文分析方法的有效性，表明自适应有限元在模拟局部化问题中具有优势．     

多股传输电缆的数值模拟

采用线单元的边界元方法研究了五股传输电缆线的电位问题，得到了五股传输电缆线的电位场的分布规律，并且绘制了电位场的等位线图和立体图，计算结果表明，用线单元边界元法处理此类问题方便、快捷、精度高。     

云南普洱茶产地土壤理化性状分析

选择云南省普洱茶产地普洱市、临沧市和西双版纳州为研究区,对不同的土壤类型和土壤各层的理化性质进行分析,并结合茶园的生长情况,研究了土壤理化性质的适宜性.结果表明:1)普洱茶主产区各种土壤类型中,赤红壤的N、P、K的质量分数(w)均偏低,对茶树生长的限制因素较多.黄壤的全P、全K含量丰富,适合茶树生长的有利条件较多.其他土壤类型中,K和P是茶树生长的主要限制因子;2)表、心、底土层的质地一般为粉砂质壤土,是pH范围为4~5的微酸性土壤,存在土壤表层酸化的趋势;3)土壤有机质层深厚,w(全N)达到1%~2%;w(速效P)较低,且从表、心、底土层逐渐减少.w(K)较高,w(全K)平均值在0.6%~1.0%,w(有效K)在土壤表层的积累较明显;微量元素中,Fe、Mn元素w较高;4)有效P、有效K及微量元素Fe和Mn对普洱茶茶叶的生长有重要的作用.     

广义对角占优矩阵与非奇M-矩阵的新判定

给出了广义对角占优矩阵及其比较阵为非奇M-矩阵的几个新的充分条件,并用数值例子说明了所得结果的有效性.     

城市会展旅游客商需求与会展系统要素的配置——以河北省为例

以城市会展旅游客商需求为出发点,在探讨城市会展旅游需求市场的结构与特征的基础上,分析了会展旅游供给系统的要素构成及配置要素.阐述了河北4个会展城市会展旅游供给系统要素配置的现状,并得出相应结论.     

Speleothem Mg,Sr and Ba records during the MIS 5c-d,and implications for paleoclimate change in NE Sichuan,Central China

Trace metals of Mg, Sr and Ba in a stalagmite (SZ2) collected from Suozi Cave in NE Sichuan, Central China, were analyzed with ICP-AES. The stalagmite was dated to have developed between 120 and 103 ka BP. Results indicate that the Mg/Ca, Sr/Ca and Ba/Ca ratios of SZ2 varied between (9500-14700) 10 6 , (54-123) 10 6 and (31-82) 10 6 , respectively. The three records displayed significant millennial scale variations, which correlate with changes in past climate and environment. Lower values of Mg/Ca ratios and higher values of Sr/Ca and Ba/Ca ratios of SZ2 occurred during relatively cold-dry marine isotope stage (MIS) 5d, while the opposite trend was observed during relatively warm-humid MIS 5c. Trace metals in speleothems can be affected by distribution coefficients or trace metal concentrations in solutions from which speleothems precipitate. Temperature is suggested to be the dominant controller of Mg/Ca ratios in SZ2, whereas the Sr/Ca and Ba/Ca ratios may have been influenced by surface soil and atmospheric dust activities and prior calcite precipitation in Suozi Cave. Further investigations are warranted as to whether Sr/Ca and Ba/Ca ratios were affected by temperature and growth rate of the speleothem. The shifts of Mg/Ca, Sr/Ca and Ba/Ca records in SZ2 during the transition from MIS 5d to 5c apparently were earlier than the oxygen isotope record ( 18 O) of the same stalagmite. This possibly indicates (1) that atmospheric dust activity (the mechanism affecting SZ2 Sr/Ca and Ba/Ca ratios) is closely related to temperature, and (2) that temperature changes (dominated by solar insolation) precedes change in speleothem 18 O records which are controlled by both summer monsoons and winter temperatures.     

河南省桐柏县河坎银矿地质特征及找矿标志

桐柏县河坎银矿位于朱庄背斜北东翼和老洞坡A型背斜北西翼结合部位,赋存于上元古界歪头山组下部第五（Pt3w15）和第六岩性段（Pt3w16）中。低角度的层间剥离断层或高角度的顺层正断层控制了矿体的分布。与矿化关系密切的近矿围岩蚀变以硅化为主,伴随有绢云母化和黄铁矿化。主要指示元素在矿体与围岩中均形成异常,元素轴向分带由上至下呈现低温元素组合到高温元素组合的变化规律。Cu、Mo为矿体尾部（下部）元素。Ag/Mo,Ag.Sb/Cu.Mo元素比值大小可作为判别矿体剥蚀程度及寻找深部银金属矿的地球化学标志。     

基于多尺度分析提取胚胎边缘的算法研究

本文提出了一种从胚胎图像中提取边缘的有效算法。该算法在小波多尺度分析的基础上,针对胚胎边缘的几何形态选择多尺度元素进行边缘提取。实验表明,该算法具有良好的胚胎边缘提取效果。