琼脂免疫扩散试验和间接免疫荧光染色法在禽网状内皮组织增殖病流行病学调查中的应用

应用琼脂免疫扩散试验和间接免疫荧光染色法检测鸡血清中抗ＲＥＶ抗体有很强的特异性,用以检测黑龙江、山东、辽宁、广东等地１７０３份鸡血清,阴性率分别为１４％和２３％,证明上述四省均有禽网状内皮组织增殖病病毒感染。     

高层房屋的结构体系

本文详细叙述了高层房屋结构体系的特点及经济适用范围,具有一定的应用价值。     

多肋曲线梁桥的解析有限条法

提出了一种求解多肋曲线梁桥弹性微分方程的实用方法，其中应用正弦级数构造了曲梁变形曲线，由伽辽金法求解，此种方法使曲线梁桥的弹性微分方程得到简化、易求解的同时，计算精度有所提高；可供桥梁设计人员参考应用。     

Close encounters with a CSA: The reflections of a bruised and somewhat wiser anthropologist

This essay tells a story. It is a story of the author's experience with community supported agriculture (CSA). It is also a story that depicts the difficulties of academic activism and grass-roots engagement. As an academic and an activist, the author argues that it is important to admit and share experiences that are less than perfect, since they are the basis for a more complete knowledge and a more organic existence, individually, collectively, sensually, and intellectually.     

负载型Co/SiO2催化鲁米诺化学发光体系测定抗坏血酸

在碱性介质中,负载型Co/SiO2对鲁米诺-过氧化氢体系有增敏作用,而抗坏血酸(Vc)对该发光体系有强烈的抑制作用,据此建立了基于流动注射技术测定Vc的化学发光新方法.在最优实验条件下,测定Vc的检出限为4.2×10-10g/mL,线性范围为4.0×10-9～1.0×10-7g/mL.将本法用于维生素C药片中Vc的测定,并与药典法比较,结果令人满意.     

Experimental Analysis of Bending Fatigue Behavior of Prestressed Concrete Girders with Complex Box-type Section Used in High-speed Railway

Based on a prestressed concrete girder with complex box-type section of 36m span, four models of 1/6 scale are made, and one of them is mixed with a kind of polymer latex. Experiments with monotonically and cyclically loading are carried out on the models to study bending fatigue behavior of the girder in service and under cyclic load exceeding the designed value, as well as the impact of polymer on fatigue performance of the girder. The results show that, under the cyclic load of value determined by the maximum and minimum stress at the key part of the girder in service, the fatigue performance is satisfactory and the fatigue behavior under a subsequent larger cyclic load is similar with that one under the same big cyclic load. Besides, the polymer has no negative effect on fatigue behavior of the model.     

基于频率改变的损伤识别方法研究

介绍了基于频率变化平方比的损伤定位方法。通过一简支梁仿真计算,发现该方法可以进行损伤定位,而对于对称结构则不能识别。     

丙烯酸正丁酯合成反应的负载型固体催化剂的研究

选用强酸性阳离子交换树脂、活性氧化铝和活性白土三种栽体，以漫渍法分别负载活性组分H^ ，Ni^2 ，Fe^3 ，Mb^2 ，Al^3 ，Mx^2 ，Sn^4 ，制成了几种固体酸催化剂．进行载体和活性组分的试验，筛选出综合性能较好的用于酯化反应的Mx^2 ／树脂催化剂，并对此催化剂的制备工艺进行了改进．改进后的催化剂应用于丙烯酸正丁酯的合成，酯化收率达到97％以上．     

现浇梁板结构若干问题的探讨

本文通过对现浇粱板结构构造、承台拉梁和地下室底板受力的分析,提出了主梁有效高度的 确定方法及承台拉梁和地下室底板钢筋的构造措施。