斜拉桥异型钢结构主塔整体稳定性分析

针对安徽省涡河三桥双索面斜拉桥主塔设计这一工程实例,基于弹性稳定理论研究其两类稳定性问题,采用ANSYS软件建立该桥钢结构主塔的等效实体有限元模型,分别进行屈曲模态分析和非线性屈曲分析。分析结果表明：自重条件下主塔结构整体稳定性较好,可满足工程需要。     

70-year old female patient with mismatch between hematocrit and hemoglobin values: the effects of cold agglutinin on complete blood count

Introduction:

There are a number of pre-analytical and analytical factors, which cause false results in the complete blood count. The present case identifies cold agglutinins as the cause for the mismatch between hematocrit and hemoglobin values.

Materials and methods:

70-year old female patient had a history of cerebrovascular diseases and rheumatoid arthritis. During routine laboratory examination, the patient had normal leukocyte and platelet counts; however, the hemoglobin (Hb: 105 g/L) and hematocrit (HCT: 0.214 L/L) results were discordant. Hemolysis, lipemia and cold agglutinin were evaluated as possible reasons for the mismatch between hematocrit and hemoglobin values.

Results:

First blood sample was slightly hemolysed. Redrawn sample without hemolysis or lipemia was analyzed but the mismatch became even more distinct (Hb: 104 g/L and HCT: 0.08 L/L). In this sample, the titration of the cold agglutinin was determined and found to be positive at 1:64 dilution ratios. After an incubation of the sample at 37°C for 2 hours, reversibility of agglutination was observed.

Conclusion:

We conclude that cold agglutinins may interfere with the analysis of erythrocyte and erythrocyte-related parameters (HCT, MCV, MCH and MCHC); however, Hb, leukocyte and platelet counts are not affected.     

‘Tracksuit Traitors’: Eastern German Top Athletes on the Run

In the time between its founding and the fall of the wall in November 1989, more than three million people left the German Democratic Republic, many of them illegally and under dangerous circumstances. The party leadership perceived this mass exodus of its citizens as one of the major threats for the real socialist regime.1^?1. Bispinck Bispinck, Henrick. “Republikflucht. Flucht und Ausreise als Problem der DDR-Führung.” Vor dem Mauerbau. Politik und Gesellschaft der DDR in den Fünfziger Jahren, edited by MichaelSchwartz and Hermann Wentker, 285–309. München: Oldenbourg Wissenschaftsverlag, 2003. [Google Scholar], “Republikflucht.”‘Republikflucht’, as this move from East to West was called by the party leadership, was the reason for the two most important hiatuses in Eastern German history: the first result was that the SED leadership built the wall in August 1961. Many years later, in the fall of 1989, the situation culminated, when a flood of desperate refugees tried to escape to the Federal Republic of Germany via Hungary, Poland and Czechoslovakia, thus effectively hurrying along the regime's demise. The world of sports, too, was considerably affected by this phenomenon. The following essay shall offer a short historical summary of the different reasons and routes Eastern German top athletes chose for their escape. Examples from various decades show that in spite of individual circumstances certain similarities in pattern can be made out, especially in respect to the way the government dealt with these cases of ‘treason’.     

丙烯酸酯和醋酸乙烯酯二元共聚物的合成、表征与降凝助滤效果

主要介绍了丙烯酸酯和醋酸乙烯酯二元共聚物（简称AV）类柴油降凝剂的合成和降凝助滤效果。AV柴油降凝剂，是以丙烯酸酯、醋酸乙烯酯为原料，以甲苯为溶剂，以偶氮二异丁腈为引发剂，恒温聚合制得。该剂对胜利油田胜华炼油厂0＃柴油的纯降凝度可达19℃，冷滤点降低可达9℃，对东明、濮阳、汤阴、大庆等地的柴油也有很好的降凝和降冷滤点效果。     

论述几种常见“冷桥”节点和处理方法

论述几种常见“冷桥”发生的位置和原因，提出了处理方法     

冷链物流产业形成机理及其发展潜力评估方法研究

为研究冷链物流产业形成机理及其冷链物流产业发展潜力的评估方法,分析冷链物流产业发展的主要因素,建立冷链物流产业的解释结构模型,阐述冷链物流产业的形成机理,提出冷链物流产业发展潜力评估模型和方法,并通过具体实例说明该理论模型和方法的科学性及有效性.     

高层钢结构施工工艺及焊接技术的应用

随着高层建筑的不断涌现,对高层建筑框架结构施工技术的要求也越来越高。高层钢框架结构以其工艺绿色环保、简便、施工速度快,在当前高层建筑工程中得到广泛的应用。为了达到技术先进、安全适用、经济合理,需要不断提高高层钢结构施工水平,尤其是钢框架结构施工工艺与焊接变形分析技术水平。该文结合实际工程对高层钢结构施工工艺以及焊接技术作了介绍,可供相关人士参考。     

略论技击的构成要素——以冷兵器时代军事需求为背景

技击概念是什么？是了解技击本身和建立技击与现代武术关系首先要解决的问题.明确技击的构成要素,不仅为进一步研究技击演变提供理论支撑,更将为明确现代技击概念奠定基础.本文采用文献资料法和逻辑推理法对技击文本文献进行研究.阐明冷兵器时代军事背景下,技击是士兵练就的近距离手持器械的杀敌动作.其具备四要素：一、技击的获取过程是练就的,不是无意间的一个动作就能称为技击;二、技击的使用者是士兵,其彰显了技击的军事特征;三、技击的表现形式是近距离手持器械的动作,排斥了脱手类兵械的使用;四、技击的使用目的--杀敌.最后提出技击脱离军阵束缚以后,其使用者、表现形式和使用目的都出现了多元并存局面的结论.     

略论技击的构成关系——以冷兵器时代军事需求为例

技击概念是了解技击本身和建立技击与现代武术关系首先要解决的问题。明确技击的构成关系,不仅为进一步研究技击演变提供理论支撑,更将为明确现代技击概念奠定基础。文章采用文献资料法和逻辑推理的研究方法进行研究。阐明冷兵器时代军事需求下,技击是由技与击构成的有机体,技为击做必要的准备,击在杀敌的过程中验证技的实效性;技与击在形成于应用的过程中互相作用：形成技为击做准备,击验证技的实效性并更加完善技的循环作用关系。     

后驻体喷孔位置对驻涡腔流动冷态数值的影响

为使采用驻涡燃烧的旋转冲压发动机的燃烧组元获得燃烧的稳定性,研究后驻体喷孔位置对驻涡腔流动冷态数值的影响.应用Fluent软件模拟驻涡燃烧室中三维冷态流场的流动特性;湍流模型采用RNG k-ε模型,近壁面处采用标准壁面函数法;设置喷射物质为理想气体;控制方程离散采用基于控制体中心的有限体积方法,选用隐式二阶迎风格式;驻涡燃烧室三维几何模型采用结构化适体网格,网格节点单元数约为600 000;求解方程组采用动量方程和能量方程进行耦合的方法,控制残差<10-4.结果表明:后驻体喷孔位置对驻涡腔的总压损失、喷射质量流率影响较小;随着喷射位置向后驻体外侧偏移,驻涡腔内的流场平均流速有所降低,形成有利于稳定火焰的流动条件.计算预测的变化趋势与实验结果相同,表明可为实际设计提供一种有效的方法.