what is the spontaneous emission and what is the stimulated emission ppt? ....etc

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Vertical Cavity surface Emission Lasers (VCSEL) are lasers that emit light from their surface in contrast with regular ???edge emittersâ„¢. Also they have got a vertical cavity , as the name suggests, which enables surface emission.???Vixels??? , as they are commonly called ,have several superior characteristics compared to their edge emitting counter parts.

VCSEL Semiconductor micro laser diodes which emit light perpendicular to their PN junction in a cylindrical beam vertically from the surface of a fabricated wafer and feature circul ....etc

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MPFI& Emission control system
1. INTRODUCTION
Petrol vehicles uses device called carburetor for supplying the air fuel mixture in correct ratio to cylinders in all rpm ranges. due to construction of the carburetor is relatively simple, it has been used almost exclusively on gasoline engines in the past. However in response to recent demands for cleaner exhaust emission, more economical fuel consumption, improved drivability, etc., the carburetor now must be equipped with various compensating devices, making it more ....etc

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The effect of sub surface defects in surface roughness monitoring through ultrasonic flaw detector.
Objective
 To study the effect of sub surface defects in surface roughness monitoring through ultrasonic flaw detector.
 To study the sizing of defects.
Ultrasound Concepts
• All sound waves, whether audible or ultrasonic, are mechanical vibrations involving movement of the medium in which they are traveling. A sound wave may be transmitted through any material which behaves in an elastic manner.
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THE IMPACT OF TRANSPORTATION CONTROL MEASURES ON EMISSION CONTROL DURING THE OLYMPIC GAMES IN BEIJING

1. INTRODUCTION
1.1 GENERAL

Emissions from vehicles come from the by-products of the combustion process which takes place inside the vehicle when it moves. In addition to this, volatile organic compounds (VOC) also escape through fuel evaporation. As vehicle exhaust systems have improved, evaporative emissions have become a larger component of total vehicle VOC emissions

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what is surface computing? explain in detail.
tell me about the technology used, invented by whom and when..
and every thing about surface computing.
also give me page link to get good research paper on surface computing.
i will greatly thankful to u for this regard.
....etc

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I am a btech final year student, i need to give a seminar on the related topic. plzzzzzz give me more info on SED technology like seminar report, power point presentation. ....etc

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please send me full content immediately ....etc

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1. INTRODUCTION
Petrol vehicles uses device called carburetor for supplying the air fuel mixture in correct ratio to cylinders in all rpm ranges. due to construction of the carburetor is relatively simple, it has been used almost exclusively on gasoline engines in the past. However in response to recent demands for cleaner exhaust emission, more economical fuel consumption, improved drivability, etc., the carburetor now must be equipped with various compensating devices, making it more complex system. ....etc

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