Free space optical communications is a line-of-sight (LOS) technology that transmits a modulated beam of visible or infrared light through the atmosphere for broadband communications. In a manner similar to fiber optical communications, free space optics uses a light emitting diode (LED) or laser (light amplification by stimulated emission of radiation) point source for data transmission. However, in free space optics, an energy beam is collimated and transmitted through space rather than being guided through an optical cable. These beams of li ....etc

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INTRODUCTION

The history of antimatter begins with a young physicist named Paul A.M.Dirac (1902-1984) and the strange implications of a mathematical equation. This British physicist formulated a theory for the motion of the electrons in electric and magnetic fields. Such theories had been formulated before, but what was unique about Dirac s was that his included the effects of Einstein s Special Theory of Relativity. This theory was formulated by him in 1928.Mean while he wrote down an equation, which combined quantum theory and spe ....etc

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Introduction to Propulsion



Definitions and Basic Relations

Fluid dynamics of compressible flows is generally referred to as Gas dynamics. This deals with an unified analysis of dynamics and thermodynamics of compressible flows.
Convectional fluid mechanics analyses are inadequate for high speed flows of gases and vapours due to non-compressibility approach.
Therefore in the application like high speed aerodynamics, rocket and missile propulsion, steam and gas turbines, and high speed turbocompressors c ....etc

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Air Breathing Propulsion Technical Committee



Public Policy Initiative On VAATE*

VAATE Is A Cooperative USG/Industry Initiative That Provides An Overarching Structure For All U.S. Gas Turbine Engine R&D Efforts
VAATE Modeled On The Successful IHPTET (Integrated High Performance Turbine Engine Technology) Program: IHPTET Concludes In 2005
VAATE Goal: 10X Affordable Capability (T/W, SFC, $)

Primarily Military, But Many Significant Commercial Payoffs
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PROPULSION SUBSYSTEMS
INTRODUCTION
Spacecraft are provided with sets of propulsive devices so they can maintain three-axis stability, control spin, execute maneuvers, and make minor adjustments in trajectory. The more powerful devices are usually called engines, and they may provide a force of several hundred newtons. These may be used to provide the large torques necessary to maintain stability during a solid rocket motor burn, or they may be the only rockets used for orbit insertion.
Smaller devices, generating betwee ....etc

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Magnetic Levitation space propulsion


Introduction To Maglev Technology And Application

1.1 Principle of Maglev System
Maglev is a system in which the vehicle runs levitated from the guideway (corresponding
to the rail tracks of conventional railways) by using electromagnetic forces between
superconducting magnets on board the vehicle and coils on the ground. The following is
a general explanation of the principle of Maglev.

1.1.1 Magnetic Levitation
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