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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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clever entrepreneurs and technologists are borrowing many of the devices and techniques developed for fiber-optic systems and applying them to what some call fiber-free optical communication. Although it only recently, and rather suddenly, sprang into public awareness, free-space optics is not a new idea. It has roots that go back over 30 years--to the era before fiber-optic cable became the preferred transport 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 rese..................[:=> 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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ro scale. MEMS is an enabling technology and current applications include accelerometers, pressure, chemical and flow sensors, micro-optics, optical scanners, and fluid pumps. 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..................[:=> 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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e voltage-time characteristics of the arresters are improved.

It assured reliable protection of medium voltage (e.g., 10kv) over head power lin..................[:=> 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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loud cover, and wind which cause a similar disturbance when a laser beam is transmitted through the atmosphere)
_ Moving building (although we are not aware of the movement, buildings often sway from side to side even settle into the ground causing offset to the laser beam and making the receiver laser receive less power)


Free space applications
Due to its properties optical free space communications is suited very well for providing high bandwidth to point-to-point connections. The attenuation characteristics of free space make inter-satellite connections a promising appl..................[:=> 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. It is extremely efficient in mitigating common problems in high-speed communication such as multipath fading and RF noise interference. It can be considered as multiple access technique OFDMA....................[:=> 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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95 cm in diameter).

The Overall System
Early satellite TV viewers were explorers of sorts. They used their expensive dishes to discover unique programming that wasn't necessarily intended for mass audiences. The dish and receiving equipment gave viewers the tools to 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 satellit..................[:=> 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
Optics, Space , Free, free space optics ,
r-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 reach transmission, low capacity, severe alignment problems as well as vulnerability to weather interferences were the major drawbacks at that time. The optical communication without wire, however, evolved! Today, FSO systems guarantee 2.5 Gb/s taxes with carrier class availability. Metropolitan, access and LAN networks are reaping t..................[:=> 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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rallel with the insulators.

Lightning is an electrical discharge between cloud and the earth, between clouds or between the charge centers of the same cloud. Lightning is a huge spark and that take place when clouds are charged to at a high potential with respect to earth object (e.g. overhead lines) or neighboring cloud that the dielectric strength of the neighboring medium(air) is destroyed.


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, t..................[:=> Show Contents <=:]

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