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Free Space Optics

Posted by: Computer Science Clay
Created at: Sunday 01st of March 2009 02:10:42 AM
Last Edited Or Replied at :Sunday 01st of March 2009 02:10:42 AM
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medium for high-speed communication. In those days, the notion that FSO systems could provide high-speed connectivity over short distances seemed futuristic, to say the least. But research done at that time has made possible today's free-space optical systems, which can carry full-duplex (simultaneous bidirectional) data at gigabit-per-second rates over metropolitan distances of a few city blocks to a few kilometers.

FSO first appeared in the 60's, for military applications. At the end of 80's, it appeared as a commercial option but technological restrictions prevented it from success. Low..................[:=> Show Contents <=:]

MEMS in space

Posted by: computer science crazy
Created at: Monday 23rd of February 2009 12:49:15 PM
Last Edited Or Replied at :Friday 14th of January 2011 09:02:58 AM
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umps. Generally a satellite consists of battery, internal state sensors, communication systems and control units. All these can be made of MEMS so that size and cost can be considerably reduced. Also small satellites can be constructed by stacking wafers covered with MEMS and electronics components. These satellites are called I Kg class satellites or Picosats. These satellites having high resistance to radiation and vibration compared to conventional devices can be mass-produced there by reducing the cost. These can be used for various space applications. Also small satellites can be construc..................[:=> Show Contents <=:]

Lightning Protection Using LFA-M

Posted by: computer science crazy
Created at: Sunday 15th of February 2009 12:36:04 AM
Last Edited Or Replied at :Thursday 01st of March 2012 11:49:33 PM
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It is designated as LFA-M. It offers great number of technical and economical advantages. The important feature of this modular long flashover arrester (LFA-M) is that it can be applied for lightning protection of overhead distribution line against both induced overvoltages and direct lightning strokes.

The induced over voltages can be counteracted by installing a single arrester on an overhead line support (pole). For the protection of lines against direct lightning strokes, the arresters are connected between the poles and all of the phase conductors in parallel with the insulators...................[:=> Show Contents <=:]

Optical Free Space Communication

Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:34:59 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 01:17:57 AM
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but has some properties of the 1st. Many aspects are related to fibre optics with the difference, that the media is air and not fibers. Therefore are the required devices similar to those used with fibers.

The advantages of such a system are the following:
_ No need for digging up the roads
_ No radio frequency licenses are required
_ Bandwidth is equal or superior to fibre systems and much better than RF
_ Doesn't cause interference with existing electromagnetic equipment because interference on narrow band point-to-point connections is rather unlikely.

But there are as well some ..................[:=> Show Contents <=:]


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 01:13:47 PM
Last Edited Or Replied at :Thursday 01st of April 2010 04:15:58 AM
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on technique. OFDM is a communication technique that divides the communication channel into a number of equally spaced frequency bands. A sub carriers a portion of the users information in each band. Each sub carriers is orthogonal (Independent of each other) with every other sub carrier. OFDM efficiently squeezes multiple modulated carriers tightly together reducing the required bandwidth.OFDM was invested in 1960?s, only recently it has recognized as an excellent method for bi-directional wireless data communication. It is extremely efficient in mitigating common problems in high-speed commu..................[:=> Show Contents <=:]

Direct to home television DTH

Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:26:57 AM
Last Edited Or Replied at :Monday 01st of August 2011 11:18:36 PM
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pick up foreign stations, live feeds between different broadcast stations, NASA activities and a lot of other stuff transmitted using satellites. Some satellite owners still seek out this sort of programming on their own, but today, most Direct to home TV customers get their programming through a direct broadcast satellite (DBS) provider, such as DirecTV or the Dish Network. The provider selects programs and broadcasts them to subscribers as a set package. Basically, the provider's goal is to bring dozens or even hundreds of channels to your television in a form that approximates the competiti..................[:=> Show Contents <=:]

Free Space Optics

Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:03:26 AM
Last Edited Or Replied at :Friday 24th of February 2012 11:24:18 PM
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mmunication without wire, however, evolved! Today, FSO systems guarantee 2.5 Gb/s taxes with carrier class availability. Metropolitan, access and LAN networks are reaping the benefits.

The use of free space optics is particularly interesting when we perceive that the majority of customers does not possess access to fibers as well as fiber installation is expensive and demands long time. Moreover, right-of-way costs, difficulties in obataining government licenses for new fiber installation etc. are further problems that has turned FSO into the option of choice for short reach applications.
..................[:=> Show Contents <=:]

Lightning Protection Using LFA-M

Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:39:22 PM
Last Edited Or Replied at :Sunday 17th of October 2010 11:56:38 PM
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There are two main ways in which the lightning may strike the power system . They are

1. Direct stroke

2. Indirect stroke

Direct Stroke

In direct stroke, the lightning discharge is directly from the cloud to the an overhead line. From the line, current path may be over the insulators down to the pole to the ground. The over voltage set up due to the stroke may be large enough to flashover this path directly to the ground. The direct stroke can be of two types

1. stroke A
2. stroke B

In stroke A, the lightning discharge is from the cl..................[:=> Show Contents <=:]

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