McGraw-Hill Higher Education A Division of The McGraup-Hill Companies MODERN ANALYTICAL CHEMISTRY Copyright e 2000 by The McGraw-Hill Companies, Inc. All rights reserved. Printed in the United States of America. Except as permitted under the United States Copyright Act of 976, no part of this publicatio

(Axial tension & Compression, Shear) §2-1 轴向拉压的概念及实例 (Concepts and examples of axial tension & compression) 第二章 轴向拉伸和压缩 Chapter2 Axial Tension and Compression §2-2 内力计算 (Calculation of internal force) §2-3 应力及强度条件 (Stress and strength condition) §2-4 材料在拉伸和压缩时的力学性能 (Material properties in axial tension and compression) §2-5 拉压杆的变形计算 (Calculation of axial deformation) §2-6 拉压超静定问题 (Statically indeterminate problem of axially loaded members) §2-7 剪切变形(Shear deformation)

1 Unstacking Here is another wildly fun 6.042 game that's surely about to sweep the nation! You begin with a stack of n boxes. Then you make a sequence of moves. In each move, you divide one stack of boxes into two nonempty stacks. The game ends when you have n stacks, each containing a single box You earn points for each move; in particular, if you divide one stack of height a b into two stacks with heights a and b, then you score

Random walks 1 Random walks a drunkard stumbles out of a bar staggers one step to the right, with a canal lies y steps to his right. Thi I equal p second, he either staggers one step to the left or probability. His home lies r steps to his left, and everal natural questions, including 1. What is the probability that the drunkard arrives safely at home instead of falling into the canal? 2. What is the expected duration of his journey however it ends? The drunkard's meandering path is called a random walk. Random walks are an im- portant subject, because they can model such a wide array of phenomena. For example

In the addition of HX to an unsymmetrically substituted alkene, the hydrogen atom adds to the carbon atom of the double bond that already has the greater number of hydrogen atoms and that the X group adds to the carbon having more alkyl substituents. Markovnikov’s rule can be restated by saying that, in the addition of HX to an alkene, the more stable carbocation intermediate is formed

Functional groups The structural features that make it possible to classify compounds by reactivity are called functional groups. A functional group is a part of a larger molecule and is composed of an atom or a group of atoms that have a characteristic chemical behavior. The Chemistry of every organic molecules

Quinones are an interesting and valuable class of compounds because of their oxidation-reduction, or redox, properties. The redox properties of quinones are important to the functioning of living cells, where compounds called ubiquinones(泛醌) act as biochemical oxidizing agents to mediate the electro-transfer processes involved in energy production

17.1 The Acidity of the α Hydrogens of Carbonyl Compounds: Enolate Anions 17.2 Keto and Enol Tautomers 17.3 Reactions via Enols and Enolate Anions

A UV-Vis spectrophotometer measures the amount of light absorbed at each wavelength of the UV and visible regions of the electromagnetic spectrum. λmax— the wavelength of maximum absorption

10.3 The Reactions of Alkanes with Halogens 10.3 A Multiple Substitution Reactions Versus Selectivity 10.4 Chlorination of Methane:Mechanism of Reaction