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CRYOGENICS AND ITS SPACE APPLICATIONS full report


Posted by: project report tiger
Created at: Monday 15th of February 2010 08:04:22 AM
Last Edited Or Replied at :Sunday 21st of March 2010 03:24:18 AM
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DVANCED ADR (AADR)
The Advanced Adiabatic Demagnetization Refrigerator is a multistage Adiabatic Demagnetization Refrigerator (ADR). Each stage passes the absorbed heat to the next stage in line. The last stage (the hot stage) passes the heat to the heat sink, which could be a liquid helium bath or mechanical cryo-cooler. The Adiabatic Demagnetization Refrigerator (ADR) is a magnetic cooling system that has been used routinely in the laboratory for cooling to temperatures below the temperature of liquid helium. Astronomers are now developing sensors for x-ray and infrared astronomy which w..................[:=> Show Contents <=:]



composite materials for aerospace applications ppt


Posted by: chinna518
Created at: Monday 01st of March 2010 10:41:47 AM
Last Edited Or Replied at :Sunday 28th of March 2010 04:09:44 PM
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send me this topic ppt p..................[:=> Show Contents <=:]



composite materials for aerospace applications ppt


Posted by: sri.2988
Created at: Thursday 25th of February 2010 06:12:22 AM
Last Edited Or Replied at :Wednesday 04th of May 2011 05:17:45 AM
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CRYOGENICS AND ITS SPACE APPLICATIONS full report


Posted by: project report tiger
Created at: Monday 15th of February 2010 08:04:22 AM
Last Edited Or Replied at :Sunday 21st of March 2010 03:24:18 AM
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ty.
All the really low temperature cooling systems have one thing in common. Unlike the refrigerator in your kitchen, none of these systems will work at room temperature. They all must be cooled to low temperatures in order to produce the even lower temperatures that we are aiming for. The XRS ADR was cooled by a tank of liquid helium at 1.3 Kelvin (1.3 degrees above absolute zero. Surrounding the liquid helium tank was a tank of solid neon at 17 Kelvin (17 degrees above absolute zero.). At Goddard the helium tank, the ADR, the x-ray sensors, were all built and all the equipment attached dir..................[:=> Show Contents <=:]



Microphotonics for Space Application full report


Posted by: project reporter
Created at: Monday 01st of February 2010 01:25:34 AM
Last Edited Or Replied at :Friday 04th of June 2010 04:06:00 AM
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y using several of these PBG/MEMS optical accelerometer devices in series, the effects of acceleration on the resulting opical measurands, such as a change in the relative transmittance intensity or wavelength, can be intensified to increase the device accuracy, as shown by the following preliminary simulations, given in fig. 13-2, for 1,3 and 6 PBG/MEMS devices in series.
Fig. 3.2: Transmitted intensity ratio versus acceleration for PBG/MEMSD optical accelerometer.
Table 3-1 compares the PBG/MEMS accelerometer to a bulk accelerometer based on strain sensors and to an electrical MEMS accele..................[:=> Show Contents <=:]



METALLURGICAL CHANGES IN STEELS DUE TO CRYOGENIC PROCESSING ITS APPLICATIONS


Posted by: computer science technology
Created at: Sunday 24th of January 2010 11:20:47 AM
Last Edited Or Replied at :Sunday 24th of January 2010 11:20:47 AM
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merely reaching a suitably low temperature for an instant would produce the same effect as holding for several days.
Cryogenic treatments can produce not only transformation of retained austenite to martensite, but also can produce metallurgical changes within the martensite. The martensitic structure resists the plastic deformation mush better than the austenitic structure, because the carbon atoms in the martensitic lattice lock together the iron atoms more effectively than in the more open-centered cubic austenite lattice. Tempering the martensite makes it tougher and better able to resi..................[:=> Show Contents <=:]



Composites materials for aerospace applications full report


Posted by: computer science technology
Created at: Sunday 24th of January 2010 07:49:09 AM
Last Edited Or Replied at :Sunday 24th of January 2010 07:49:09 AM
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ft, helicopters, satellites, launch vehicles and missiles all around the world is perhaps the most glowing example of the utilization of potential of such composite materials.
2. The aerospace structures and features
Important requirements of an aerospace structure and their effect on the design of the structure are presented in table 1.
Table 1. Features of aircraft structure.
Requirement Applicability Effect
¢ Light-weight All Aerospace Programmes Semi-monocoque construction
* Thin-walled-box or stiffened structures
Use of low density materials:
* Wood * Al-alloys * Composites
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CRYOGENICS


Posted by: seminar projects crazy
Created at: Friday 30th of January 2009 12:58:28 PM
Last Edited Or Replied at :Saturday 08th of December 2012 03:28:21 AM
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rocket, the propellants are chemical compounds that undergo a chemical combustion reaction releasing the energy for thermodynamic..................[:=> Show Contents <=:]



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