本书以问答的形式较系统地介绍了机械密封的原理结构、 辅助设施、材料和计算,并根据作者近三十年的积,重点介绍 了石化行业典型泵用机械密封方法、安装、使用和故障分析等 本节特为石油化工行业从事机泵维修的技术人员和工人而 ,对从事机械密封研究和制造的人员也很有参考价值

一、链传动的特点及应用 二、传动链的结构特点 三、滚子链链轮的结构和材料 四、链传动的运动特性 五、链传动的受力分析 六、滚子链传动的设计计算 七、链传动的布置、张紧和润滑

A recent study of controlled release of a model small-molecule drug from poly (lactide-co-glycolide) microspheres prepared by the single-emulsion method found that the diffusion constant of the drug through the polymer was best related to the polymer's molecular weight according to

1. Two hydrogels are prepared from two different candidate polymers for controlled release of a protein drug, interleukin-2(IL-2). The gels exhibit the same swelling ratio at equilibrium, but gel A(formed by cross-linked polymer A, repeat unit molecular weight Mo= 100 g/mole)has

A recent study of controlled release of a model small-molecule drug from poly(lactide-co-glycolide) microspheres prepared by the single-emulsion method found that the diffusion constant of the drug through the polymer was best related to the polymers molecular weight according

5 points/problem(20 points total) 1. Two hydrogels are prepared from two different candidate polymers for controlled release of a protein drug, interleukin-2(IL-2). The gels exhibit the same swelling ratio at equilibrium, but jel a (formed by cross-linked polymer A, repeat unit molecular weight Mo= 100 g/mole)has a molecular weight between cross-links of 3,000 g/mole, while gel B (formed from cross linked polymer B, Mo=95 g/mole) has a molecular weight between crosslinks of

2.1 混凝土的物理力学性能 2.1.1 混凝土的组成结构 2.1.2 单轴向应力状态下混凝土强度 2.1.3 复合应力状态下混凝土强度 2.1.4 混凝土的变形 2.2 钢筋的物理力学性能 2.2.1 钢筋的品种与分类 2.2.2 钢筋的强度与变形 2.2.3 混凝土结构对钢筋的要求 2.3 混凝土与钢筋的粘结

第一节 概述 第二节 陶瓷容器的成型加工 第三节 陶瓷包装容器的表面装饰 第四节 陶瓷包装容器的结构设计

一、高层建筑结构的现状与发展 二、高层建筑结构的材料与体系 三、高层建筑结构的抗震设计理论 四、高层建筑结构的抗风设计理论 五、高层建筑钢结构的设计理论 六、高层建筑结构及其设计理论的研究方向与课题

1.1 入射电子在固体样品中所激发的信号及其体积 1.2 透射电子显微镜的构造 1.3 成像、变倍和衍射实现的原理 1.4 理论分辨本领极限