往复水平力作用下CFS约束混凝土柱变形能力试验研究

介绍了8根碳纤维布(CFS)约束的混凝土柱和1根混凝土柱在竖向力和往复水平力作用下的试验。研究缠绕CFS的混凝土柱的屈服后变形能力。结果表明，缠绕CFS，可以使混凝土柱具有良好的屈服后变形能力；增大纤维特征值能增大变形能力；为了达到同样大的变形能力，轴压比大的混凝土柱的纤维特征值应比轴压比小的混凝土柱大；但纤维特征值大干一定值后。增大纤维特征值对提高混凝土柱屈服后变形能力的作用不大，轴压比对CFS约束混凝土柱的变形能力的影响也不大。     

Experimental investigation on built-up columns

This study presents a direct experimental verification of the AISC-LRFD slenderness ratio formulas for built-up compression members. Comparisons of slenderness ratios as specified in various design codes including the AISC-ASD, the AISC-LRFD, the AS-4100 and the CSA S16-01, are also provided. Test results concluded from this study show that the 1999 LRFD formulas generally result in conservative design strengths. However, the 2005 LRFD yields slightly higher strength due to the use of a higher resistance factor of 0.9 instead of 0.85. The design strengths determined based on the slenderness ratio formulas of the Australian Code (AS-4100) are even more conservative. For back-to-back snug-tight bolted sections, the Canadian Code (CSA S16-01) gives virtually the same design outcome as the LRFD. While for back-to-back welded sections, the CSA S16-01 tends to yield a less conservative design.     

粮油中转储备库的加固改造设计

介绍了加固方案的选择、相关构件强度的计算、接点构造的处理等主要加固步骤。实践证明，此方案较经济、合理，且能最大程度地减少施工工作量。     

单柱地轨型三坐标机立柱的研究

结合单柱地轨型三坐标机的结构特点，通过对横梁的分析进而对立柱进行了详尽的研究，这些研究对立柱的结构分析，受力分析和误差分析，最后指出由立柱弹性引起的测量误差可以和由其它因素引起垢测量误差相迭加，并可进行软件修正。     

感知觉信息处理的定性映射研究

感知觉信息处理是心理学、神经科学、人工智能等领域一个重要的研究方向。建立视觉、听觉以及其他相关感觉方面的信息处理的生物原型和数学模型，涉及脑工作机制的揭示；另一方面，感知觉的产品开发蕴涵着巨大的经济、军事价值。研究了初级听皮层对声音信息的处理。运用定性映射的方法，描述了皮层中特定的功能柱对特定的声音属性进行反应这种感知觉信息处理的普遍现象。     

RC柱双向单调加载试验与分析

完成了截面尺寸、配筋、混凝土强度基本相同的 8个正方形钢筋混凝土 (RC)柱的单向和双向水平单调加载试验。结果表明 ,单调加载的RC柱的破坏现象比较轻 ;受力次方向的水平力降低了受力主方向的极限承载力 ,轴压比大 ,降低幅度也大 ;正方形对称配筋的RC柱 ,截面的极限承载力、破坏时的极限变形能力 ,与两个方向施加的位移比例无关。用负刚度模型、承载力离散化空间相关性和复合结构法进行了理论分析 ,所得水平力 -位移关系曲线与试验结果吻合较好。     

中药黄芪蛋白成分的分离和分析

中药黄芪(Huangqi)的茎的抽提液经CM-SFF柱和Sephacryl S-200柱分离纯化,得到一种毒蛋白,用高效凝胶蛋白柱和反相高效液相色谱法分离后,利用光电二极管阵列检测器峰的光谱特性确认分离峰的纯度和蛋白特性,在高效凝胶蛋白柱上制备了少量毒蛋白纯样,测定了毒蛋白分子量和氨基酸组成。     

冬季浇注混凝土墙柱的保蓄热计算

冬季浇注混凝土，利用自身的水泥水化热蓄热保温养护，是简便常用的方法，可以防止混凝土表面受冻，提高混凝土早期强度。有的文献把保温层折算为对空气的热交换系数来计算混凝土的温度。本文则给出了不稳定温度状态下，根据保温层实际厚度和保温材料与混凝土不同的导热系数，建立的两个联立的热传导微分方程，从而得到墙、圆柱的温度计算公式。用微型电子计算机即可据此设计保温层。     

Survey of aflatoxins in beer sold in Canada

Between March 1998 and March 2002, 304 samples of domestic (Canadian) and imported beers from 36 countries were picked up for the determination of aflatoxins B₁, B₂, G₁ and G₂. Twelve samples were positive with aflatoxins greater than the limit of quantitation (LOQ) (aflatoxin B₁, 4.4 ng l^-1; aflatoxin B₂, 3.4 ng l^-1; aflatoxin G₁, 11.2 ng l^-1; and aflatoxin G₂, 6.2 ng l^-1). Five samples from Mexico, two samples from Spain and one from Portugal contained aflatoxin B₁. Four samples from India contained aflatoxins B₁ and B₂. The remaining samples contained less than the LOQ for aflatoxins B₁, B₂, G₁ and G₂. The analytical method for this survey was based on that of Scott and Lawrence (Scott PM, Lawrence GA. 1997. Determination of aflatoxins in beer. Journal of AOAC International 80:1229-1234.). Aflatoxins B₁, B₂, G₁ and G₂ were determined at parts per trillion (ng l^-1) levels in beer by immunoaffinity column cleanup followed by derivatization with trifluoroacetic acid and reversed-phase liquid chromatography with fluorescence detection.     

碎石桩处理地基液化大变形的探讨

分析了产生液化大变形的机理和影响液化大变形发生发展的因素，对碎石桩进行液化处理的现状进行了阐述，提出了用碎石桩处理地基液化大变形的设计方法。