一种榫卯连接方钢管组装框架模型的荷载 位移曲线试验研究

提出一种榫卯连接方钢管组装框架结构。对两个方向的平面框架模型进行受力性能试验。介绍试验概况，给出框架模型的竖向荷载与挠度和水平荷载与水平侧移曲线，这些曲线介于刚节点框架和铰节点框架之间，属于半刚性节点框架的范畴。     

Further influence measures in factor analysis

Various influence measures are discussed for sensitivity analysis in factor analysis. The internal norm is used to characterize the vector-valued influence curves in factor analysis. Influence curves for the chi-square goodness of fit test, and the determinants of the model covariance matrix and unique variance matrix are derived. They are found to have simple formulas which are easy to be interpreted and have nice distributions for calibration. The likelihood displacement is also applied to sensitivity analysis in maximum likelihood factor analysis.     

White Zimbabwean farmers’ unstable mobilities,identity and history in Douglas Rogers’ The last resort: a memoir of Zimbabwe

White displacement as a consequence of Zimbabwe's land reform programme resulted in white economic and social mobilities and the need to reconfigure identities and preserve white Zimbabwean farmers’ history and memory as reflected in Douglas Rogers’ The last resort: A memoir of Zimbabwe (2009). This dislocation provokes a fear of loss of memory and history in the white Zimbabwean community and therefore triggers a desire to preserve history and memory, which are central in identity formation. In addition, the preservation of history and memory acts as an important site for the contestation of the land reform programme, identity and belonging.     

聚合物/表面活性剂二元复合驱研究进展

从聚合物/表面活性剂二元体系的特点出发，综述了聚/表聚/表二元复合体系的实验室研究现状以及在胜利油田孤东七区54-61进行的矿场试验情况。聚/表二元复合驱是在聚/表/碱三元复合驱的基础上去掉碱所形成的低浓度的驱油体系，可以最大限度地发挥聚合物的粘度和弹性，减少乳化液处理带来的负面影响，减弱由于碱的存在引起的地层以及井筒结垢的现象。通过国内外研究结果分析表明，聚/表二元复合体系提高原油采收率幅度在20%左右；矿场试验取得了较好的效果。聚/表二元复合体系可以克服三元体系的缺点，作为一项新的驱油方法具有宽阔的发展空间。     

脆性材料轴向压缩破坏型式的理论分析

本文利用混合型裂纹扩展的能量释放率理论对脆性材料受轴向压缩时其内部微观裂纹的扩展规律进行了研究.研究结果表明,沿纵向裂开和沿斜截面剪切断开分别对应于能量释放率的二个极大值的方向.当端面摩擦较小时,由于沿纵向裂开为能量释放率最大值的方向,试件将发生纵向裂开的破坏型式.当端面摩擦较大时,由于端面摩擦将阻碍纵向裂纹的扩展,试件将沿斜截面断裂.利用本理论对于铸铁材料的计算结果与实验结果之间具有很好的一致性.     

从《父子之间》看早期生活对奈保尔文学创作的影响

《父子之间:家庭书信集》为我们研究奈保尔提供了最为真实可信的历史材料。通过分析这部家庭书信集,揭示出作家少年时代特立尼达生活的"文化悬挂",青年时代留学英伦经历的"文化祛根",以及父亲在文学上对儿子的影响;所有这些对于奈保尔精神气质和文学理念的初步形成,有着不可低估的作用。更重要的是,作家后来的"文化无根"状态,与这一时期的生活有密切关系。对这部书信集的研究,是全面了解奈保尔的必要起点。     

On influence diagnostic in univariate elliptical linear regression models

We discuss in this paper the assessment of local influence in univariate elliptical linear regression models. This class includes all symmetric continuous distributions, such as normal, Student-t, Pearson VII, exponential power and logistic, among others. We derive the appropriate matrices for assessing the local influence on the parameter estimates and on predictions by considering as influence measures the likelihood displacement and a distance based on the Pearson residual. Two examples with real data are given for illustration.     

A study on cyclic bandwidth sum

Suppose G is a graph of p vertices. A proper labeling f of G is a one-to-one mapping f:V(G)→{1,2,…,p}. The cyclic bandwidth sum of G with respect to f is defined by CBS _f (G)=∑ _uv∈E(G)|f(v)−f(u)| _p , where |x| _p =min {|x|,p−|x|}. The cyclic bandwidth sum of G is defined by CBS(G)=min {CBS _f (G): f is a proper labeling of G}. The bandwidth sum of G with respect to f is defined by BS _f (G)=∑ _uv∈E(G)|f(v)−f(u)|. The bandwidth sum of G is defined by BS(G)=min {BS _f (G): f is a proper labeling of G}. In this paper, we give a necessary and sufficient condition for BS(G)=CBS(G), and use this to show that BS(T)=CBS(T) when T is a tree. We also find cyclic bandwidth sums of complete bipartite graphs. Dedicated to Professor Frank K. Hwang on the occasion of his 65th birthday. Supported in part by the National Science Council under grants NSC91-2115-M-156-001.     

A graphical method for evaluating mixture designs with respect to the slope

Good estimation of the slopes of the mixture response function may be important as well as estimation of mean mixture response. It is possible to evaluate and compare several mixture designs with respect to the slope. A graphical method is proposed that allows us to evaluate a given design's support for the fitted model in terms of slope variance. We can plot variances of slopes along Cox direction or axial direction according to existence of restriction of simplex region or not when comparing several different mixture designs.     

双螺旋加料器输送机理的研究

本文在正位移输送机理的基础上，提出了双螺旋加料器理论输出量模型，并讨论了对其有影响的几个重要因素。