硫酸钡、硫化锌和立德粉有机化改性的表面性质

利用不同浓度的油酸钠对硫化锌、硫酸钡和立德粉进行有机化改性,测定了改性样品的比表面、比孔容、平均孔半径的变化。研究了它们的吸附性质和润湿性质,结果表明:比表面和比孔容随浓度的增加而减少,孔分布有所变化。对水和环己烷的润湿热呈递减趋势,改性样呈疏水性。     

The augmentation of existing data for improving the path of steepest ascent

Response surface methodology is a collection of mathematical and statistical techniques that are useful for the modeling and analysis of problems in which a response of interest is influenced by several independent variables and the objective is to optimize this response. When we are at a point on the response surface that is remote from the optimum, such as the current operating conditions, there is little curvature in the system and the first-order model will be appropriate. In these circumstances, a preliminary procedure as the steepest ascent usually is employed to move sequentially in the direction of maximum increase in the response. To improve the estimation of parameters of the steepest ascent path, we present, in an efficient way, the augmentation of existing data such that the independent variables are made more orthogonal to each other. Additionally, when we estimate the true path using this method, the bias and magnitude of the covariance matrix of the estimated path is decreased, significantly.     

基面为Catmull—Rom几何样条曲面的过渡曲面构造

本文提出了构造基面为（G61,K=1)Catmull-Rom样条曲面的五次（G^2连续）及三次（G^1连续）超限插值过渡曲面的方法,并实现了这一算法。     

一类微分方程组的解法及其在圆板热弯曲问题求解中的应用

提出并证明了关于一类微分方程组基本解的积分法定理,阐述了定理的数学与物理意义。并以受激光辐照的圆板弯曲问题的求解作为该定理应用的实例。     

词的内涵意义和翻译中的动态对等

翻译中对词的内涵意义的理解不仅影响源语语义信息的忠实表达,而且也影响着源语文化信息的有效传递.在源语和目的语之间寻求词义在具体语境下的对应是再现原文精神的关键.然而由于语言和文化的差异,英汉两种语言存在着语义不完全对应,甚至缺乏对应的现象,因此译者必须抓住词的表层语义所传递的深层含义,寻求意义上的动态对等.尤金·奈达提出的"动态/功能对等"翻译理论为此提供了理论依据.     

聚合物驱后双液法固定技术试验研究

聚合物驱后恢复水驱,由于不合理的流度比造成后续注入水迅速沿高渗透层突破进入油井,使油井很快水淹。针对这一情况,通过平板模型驱油试验,研究了聚合物驱后双液法固定技术。研究得出:聚合物驱后采用双液法注入固定剂溶液,可以充分固定地下高浓度聚合物溶液,形成的冻胶体系可以有效封堵这部分高渗透孔道,迫使后续注入水进入中、低渗透层,提高了聚合物驱后的原油采收率;聚合物驱后若恢复水驱,通过絮凝和双液法固定技术,可以充分絮凝低浓度聚合物溶液,并有效固定高浓度聚合物溶液,该技术对于高渗透层的封堵十分有效,使注水剖面得到较大程度的改善,提高了后续水驱的波及系数,从而提高了水驱的原油采收率。     

基于响应面模型和灰色关联度的板料成形工艺参数优化

以非线性有限元分析软件Dynaform为平台,基于二阶响应曲面法和灰色关联度,对非标准盒制件冲压成形工艺 参数寻优。首先,利用正交试验法获取不同因素的不同组合下的减薄率数值;再采用灰色关联度理论,找到对该盒形件 最大减薄率起主要影响的2个因素即等效拉延阻力和压边力;基于响应曲面模型,利用Design Exper软件,结合中心复合 设计法( CCD)建立优化目标和主要影响因素的二次回归模型;据成形极限图(FLD)的曲线设置板料的目标函数,可求得 等效拉延阻力和压边力的最优解。通过对比优化前后的数值模拟结果可知,优化后的冲压参数可以有效提高板料成形 性能和质量。     

城堡里的女人——《神谕女士》中三个隐文本的囚禁主题

玛格丽特·阿特伍德的长篇小说《神谕女士》在表层叙事之下隐藏了《夏洛特姑娘》、《拉普索》和《蓝胡子的蛋》三个文本,这三个故事都有一个共同的主题即女性被囚禁。阿特伍德虽在小说中用三个隐文本来表达囚禁主题,表现了主人公琼及其母亲“被身体囚禁”和“被囚禁的身体”的困境以及以蓝胡子的城堡为代表的男性权力空间。但实际上小说的几条叙述线索却统一在了《蓝胡子的蛋》中男女两性权力配置的模式上。     

Assessing the discriminatory power of loss given default models

For banks using the Advanced Internal Ratings-Based Approach in accordance with Basel III requirements, the amount of required regulatory capital relies on the banks'' estimates of the probability of default, the loss given default and the conversion factor for their credit risk portfolio. Therefore, for both model development and validation, assessing the models'' predictive and discriminatory abilities is of key importance in order to ensure an adequate quantification of risk. This paper compares different measures of discriminatory power suitable for multi-class target variables such as in loss given default (LGD) models, which are currently used among banks and supervisory authorities. This analysis highlights the disadvantages of using measures that solely rely on pairwise comparisons when applied in a multi-class setting. Thus, for multi-class classification problems, we suggest using a generalisation of the well-known area under the receiver operating characteristic (ROC) curve known as the volume under the ROC surface (VUS). Furthermore, we present the R-package VUROCS, which allows for a time-efficient computation of the VUS as well as associated (co)variance estimates and illustrate its usage based on real-world loss data and validation principles.     

固定边界弯曲振动圆盘辐射阻抗研究

基于固定边界弯曲振动圆盘的振动特性,以面中心振速为参考,推导出辐射阻抗的解析表达式。利用高斯数值积分计算了6种振动模式下辐射阻抗的数值。结果表明,固定边界弯曲振动圆盘的辐射阻抗不仅是波数和圆盘半径a的函数,并且与振动模式（节圆数）有关。本研究为实际中利用该类辐射器提供了一定的理论依据。