Date: Sept.16-20 Class: Classes 1, 2 & 3, Grade 2002 Subject: English Pronunciation for Communication Purpose: The students will learn some basic concepts in English pronunciation. We are going to learn something about syllables, stress and rhythm in English. At the same time, they will learn to say greetings and farewell with appropriate pronunciation and intonation in English

In addition to the 'pure vowels' (ones where the tongue positioning is fairly static) shown above there is also the set of vowel diphthongs. These are effectively long vowels during which the tongue moves to produce a definite change of quality during the sound. In phonetic transcription we usually use a pair of linked symbols for each diphthong - one indicating the quality of the sound at the start of the vowel, and the other indicating its quality as it ends. Examples of diphthongs are found in words like 'boy', 'hear', 'may', 'my

Space Systems Laboratory Massachusetts Institute of Technology Optimization of Separated Spacecraft Interferometer Trajectories in the Absence of A Gravity-Well Optimization of Separated Spacecraft Optimization of Separated Spacecraft Interferometer Trajectories in the Interferometer Trajectories in the Absence of A Gravity Absence of A Gravity-Well Edmund M. Edmund M. Kong Prof David W. Miller David W. Miller

1 Introduction Electrostatic thrusters (“ion engines”) are the best developed type of electric propulsion device, dating in conception to the ‘50’s,(1) and having been demonstrated in space in 1964 on a suborbital flight of the SERT I spacecraft(2). The early history

NMR screening in drug discovery Jonathan M Moore NMR methods in drug discovery have traditionally been used drugs. Many pharmaceutical industry research groups have to obtain structural information for drug targets or embarked on drug discovery programs using NMR screen-

The only practical way to accelerate something in free space is by reaction. The idea is the same as in air breathing propulsion (to push something backwards) but in rockets the “something” must be inside and is lost. Here is a revealing derivation of the thrust equation for vacuum:

The result appears to be trivial, but it is not. Notice that the “velocity increment” ∆V is actually equal to the decrease in orbital velocity. The rocket is pushing forward, but the velocity is decreasing. This is because in a r-2 force field, the kinetic energy is equal in magnitude but of the opposite sign

About the final It will be in English. Try to answer in English as well. The problems are given in such a way that very short answers are needed. Chinese allowed if you can only read English

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