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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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the salt pill has reached equilibrium, the heat switch is opened, and at this point the magnetic field is reduced to nearly zero. This allows the spins of the electrons in the salt molecules to randomize adiabatically, causing the salt to cool as they do. It is expected that the Astro-E2 ADR can maintain the 60 mK temperature while in orbit for 1 day, at which point the magnetic spins are completely randomized, and no more heat can be absorbed. At this point, a recharge'' of the refrigerator is necessary, and the cycle is started again. The recharge'' of the refrigerator, typically lastin..................[:=> 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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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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ure range, we chose an Adiabatic Demagnetization Refrigerator (ADR). The ADR has been used in laboratories on the ground for years, and is
thus a well-established technology. Another commonly used laboratory cooler for this temperature range is the liquid helium dilution refrigerator. For satellite use, the ADR has 2 important advantages over the dilution refrigerator. First, the ADR is more efficient. Efficiency is important in a satellite, where electric power and all other resources are strictly limited. Second, the dilution refrigerator requires a complicated internal plumbing system. Th..................[:=> 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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hybrid and/or monolithic) of active InGaAs and SOI device structures.
1.1.1 Technical Challenges
There are a number of key challenges for the integration of photonic systems to realize micro-PIC. Firstly, different material systems, namely lithium niobate, silicon, silica and III-V compound semiconductors (Incas) are generally used in the photonics industry to generate, modulate, multiplex, amplify, and detect the optical signal. Each of these material systems entails somewhat different manufacturing tools and processes, as well as design rules. While there is also a wide range of functions ..................[:=> 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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istance will be increased substantially. Cold processes have been used for years to stabilize fixtures and tooling. The process will relieve stresses and that will help to machine parts to the proper size and shape. Cryogenic processing establishes a very stable piece of metal that remains distortion free. The process will also stabilize some plastics.
3. Typical Cryogenic Cycle:
RAMP DOWN: Lowering the temperature of the object

A typical cryogenic cycle will bring the temperature of the part down to -300F over a period of six to ten hours. This avoids thermally shocking the part. The..................[:=> 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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to Tg which in itself is now reduced due to moisture absorption. The design of a structural component, therefore, generally proceeds by reducing allowables for moisture degradation.
This single issue of environmental degradation due to moisture absorption has made development of composite components for aerospace quite expensive and tedious. Moreover, associated with the already complex behaviour of composites particularly in the long run.
Apart from the moisture absorption, the other significant aspects relate to the UV degradation and radiation effects in the long term. These are particula..................[:=> Show Contents <=:]



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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oss of ductility and embrittlement of some structural materials such as carbon steel; increase in thermal conductivity to a maximum value, followed by further decrease in temperature. Cryogenics is the low temperature (150 K) refrigeration. It explains the properties of cryogens used and their principles. Storage methods and handling techniques are covered. Cryogenics are applied in different fields of production, transportation, medicine, aerospace, physics research etc. Rocket propulsion is imparting force to a flying vehicle such as missile or spacecraft. Different types of rockets and thei..................[:=> Show Contents <=:]



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