天气、气候直接影响家畜的生长发育、繁殖机能和 生产性能,以及家畜的适应性和分布。此外,还通过 影响饲草、饲料、饮水、病原微生物及寄生虫而间接 影响家畜的健康和生产性能

第一节土壤中的细菌 第二节空气中的细菌 第三节水中的细菌

C4.2边界层概念 例1:空气运动粘度v=1.410-5m2/s

3.1概述 (1)功用 利用涡轮传来的旋转机械功,提高流过气体的压力,以提供发动机工作时所需要的压缩空气。 (2)结构形式 1 按气体流动方向

一、填空题 1、消防管理的方针是 2、交通信号灯按其显示意义的作用,可分为 、车道灯和人行横道灯。 3、全国火灾报警电话号码统一规定为 二、单项选择 1、用惰性气体稀释空气中的氧气含量,使燃烧物质缺氧而熄灭的灭火方法是() A.冷却灭火法:B.窒息灭火法; C.隔离灭火法;D.抑制灭火法

Chapter 1 Aerodynamics: Some Introductory Thoughts The term \aerodynamics\is generally used for problems arising from flight and other topics involving the flow of air. Ludwig Prandtl, 1949 Aerodynamics: The dynamics of gases, especially of atmospheric interactions with moving objects. The American Heritage Dictionary of English Language, 1969

吹脱和汽提都属于气液相转移分离法。即将气体(载气)通入废水中,使之相互充分接 触,使废水中的溶解气体和易挥发的溶质穿过气液界面,向气相转移,从而达到脱除污染物 的目的。常用空气或水蒸气作载气,习惯上把前者称为吹脱法,后者称为汽提法。 水和废水中有时会含有溶解气体。例如用石灰石中和含硫酸废水时产生大量CO2;水在软 化脱盐过程中经过氢离子交换器,产生大量O2;某些工业废水中含有H2S,HCN、NH3、CS 及挥发性有机物等。这些物质可能对系统产生侵蚀或者本身有害,或对后续处理不利,因 此,必须分离除去。产生的废气根据其浓度高低,可直接排放、送锅炉燃烧或回收利用

Chapter 2 Aerodynamics: Some Fundamental Principles and Equations There is so great a difference between a fluid and a collection of solid particles that the laws of pressure and of equilibrium of fluids are very different from the laws of the pressure and equilibrium of solids Jean Le Rond d' Alembert, 1768

Chapter 4 Incompressible Flow Over Airfoils Of the many problems now engaging attention, the following are considered of immediate importance and will be considered by the committee as rapidly as funds can be secured for the purpose... The evolution of the more efficient

11. 4 PRANDTL-GLAUERT COMPRESSIBILITY CORRECTION The methods that approximately take into account of the effects of compressibility by correct the Incompressible flow results Is called compressible corrections