9.2二重积分的计算法 一、利用直角坐标计算二重积分 二、利用极坐标计算二重积分

把空间闭区域表示为不等式的过程 (1)画出空间闭区域Ω2; z=z2(,y) (2)确定区域Ω的上下边界曲面: 设上边界曲面为z=z2(x,y)

如果所要计算的量U对于闭区域D具有可加性(就是说,当 闭区域D分成许多小闭区域时,所求量U相应地分成许多部分 量,且U等于部分量之和),并且在闭区域D内任取一个直径很 小的闭区域do时,相应的部分量可近似地表示为f(x,y)do的形 式,其中(x,y)在do内,则称f(x,y)do为所求量U的元素,记为dU 以它为被积表达式,在闭区域D上积分:

第一章基本知识 透射电镜(TEM)、扫描电镜(SEM)、扫描透射电镜(stem、超高压电镜(UHVEM 第一节透射电镜 一、基本构造 (一)电子光学系统1电子抢2磁电子透镜3样品室4观察记录装置5真空系统

0.25 zero(O, naught) point two five plus,positive

Chapter 1 Introduction Chapter 1. Introduction Getting prepared!!! Measurement, Models Theories and Laws Vector and Scalar

Chapter 16 Kinetic Theory of Gases Chapter 16 Kinetic Theory of Gases (气体动理论) 1. Molecular interpretation of Temperature Distribution of Molecular Speed Mean Free Path

Chapter 17 Heat and the First Law of Thermodynamics 1. Heat and Energy Transfer, Internal Energy and Specific Heat 2. The First Law of Thermodynamics 3. Applying ist Law of Thermodynamics Molar Specific Heats for Gases, and the Equipartition of Energy Adiabatic Expansion of a Gas

Chapter 18 Second Law of Thermodynamics Chapter 18: Second Law of Thermodynamics(热力学第二定律) O The second law of thermodynamics Reversible and irreversible process(可逆过程与不可逆过程): Carnot cycle(卡诺循环) Entropy(熵)

Chapter 19 Electric Charge and Electric Field 1. Static Electricity; Electric Charge and Its Conservation; Insulators and Conductors; Induced Charge 2. Coulomb's Law 3. The Electric Field and its Calculations 4. Electric Field and Conductors 5. Electric Dipoles