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Turbo Codes


Posted by: Computer Science Clay
Created at: Wednesday 25th of February 2009 03:34:27 AM
Last Edited Or Replied at :Wednesday 25th of February 2009 03:34:27 AM
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ch of two logical values, say -1 and +1, was transmitted. No information is passed on about how reliable the hard decision is. For example, when a +1 is output by the demodulator, it is impossible to say if it was received as a 0.2 or a 0.99 or a 1.56 value at the input to the demodulator block. Therefore, the information concerning the confidence into the demodulated output is lost in the case of a hard decision demodulator.The capacity of a channel, which was first introduced 50 years ago by Claude Shannon, is the theoretical maximum data rate that can be supported by the channel with vani..................[:=> Show Contents <=:]



Turbo Codes


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:13:37 PM
Last Edited Or Replied at :Sunday 21st of September 2008 11:13:37 PM
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z is sample from an additive white Gaussian noise process with zero mean and variance N0/2. The capacity of the AWGN channel is given by :

bits per channel use. Signalling at rates close to capacity is achieved in practice by error correction coding. An error correction code maps data sequences of k bits to code words of n symbols. Because n>k, the code word contains structured redundancy. The code rate, r = k/n is a measure of the spectral efficiency of the code. In order to achieve reliable communications, the code rate cannot exceed the channel capacity ( r < C). The minimum theoretical ..................[:=> Show Contents <=:]



FADEC - Full Authority Digital Engine Control


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 12:15:06 PM
Last Edited Or Replied at :Saturday 20th of September 2008 12:15:06 PM
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m for Full Authority Digital Engine Control. It is a system consisting of a digital computer (called EEC /Electronic Engine Control/ or ECU /Electronic Control Unit/) and its related accessories which control all aspects of aircraft engine performance. FADECs have been produced for both piston engines and jet engines, their primary difference due to the different ways of controlling the engines.

Electronics' superior accuracy led to early generation analogue electronic control first used in Concorde's Rolls-Royce Olympus 593 in the 1960s. Later in the 1970s NASA and Pratt and Whitney experi..................[:=> Show Contents <=:]



Fuel Cells on Aerospace


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 12:13:32 PM
Last Edited Or Replied at :Thursday 20th of February 2014 04:32:04 PM
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maturing process of the fuel cell will not be as rapid as that of microelectronics...................[:=> Show Contents <=:]



stratified charge engine


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 12:12:49 PM
Last Edited Or Replied at :Saturday 20th of September 2008 12:12:49 PM
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nitrogen, the result of the heat of combustion splitting the O2 and N2 molecules in the air. These will readily react with each other to create NOx, a pollutant. A catalytic converter in the exhaust system re-combines the NOx back into O2 and N2 in modern vehicles.

A Diesel engine, on the other hand, injects the fuel into the cylinder directly. This has the advantage of avoiding premature spontaneous combustion”a problem known as detonation or ping that plagues Otto cycle engines”and allows the Diesel to run at much higher compression ratios. This leads to a more fuel-efficient..................[:=> Show Contents <=:]



Biomass Fuelled Power Plant


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 12:12:25 PM
Last Edited Or Replied at :Friday 14th of February 2014 03:31:25 PM
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iomass resources to useful forms of fuel and power at a cost that is competitive with non-renewable energy resources and with a responsible view toward the environment. Hence a new generation of small-scale biomass fueled power plants are being developed based on a gas turbine prime mover. These power plants are expected to increase the efficiency and lower the cost of generating power from fuels such as wood. They are also expected to economically utilize annual plant growth materials (such as rice hulls, cotton gin trash, nutshells, and various straws, grasses, and animal manures) that are n..................[:=> Show Contents <=:]



ball valve


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:57:34 AM
Last Edited Or Replied at :Saturday 20th of September 2008 11:57:34 AM
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n line with both ends of the valve, flow will occur. When the valve is closed, the hole is perpendicular to the ends of the valve, and flow is blocked. The handle position lets you 'see' the valve's position.

Ball valves are durable and usually work to achieve perfect shutoff even after years of disuse. They are therefore an excellent choice for shutoff applications (and are often preferred to globe valves and gate valves for this purpose). They do not offer the fine control that may be necessary in throttling applications but are sometimes used for this purpose.

The body of ball valves ..................[:=> Show Contents <=:]



Valvetronic


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:55:16 AM
Last Edited Or Replied at :Saturday 20th of September 2008 11:55:16 AM
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Cylinder heads with Valvetronic use an extra set of rocker arms, called intermediate arms (lift scaler), positioned between the valve stem and the camshaft. These intermediate arms are able to pivot on a central point, by means of an extra, electronicly actuated camshaft. This movement alone, without any movement of the intake camshaft, can open or close the intake valves.

Because the intake valves now have the ability to move from fully closed to fully open positions, and everywhere in between, the primary means of engine load control is transferred from the throttle plate to the in..................[:=> Show Contents <=:]



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