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free space laser communications seminar ppt


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Created at: Thursday 31st of January 2013 03:12:57 AM
Last Edited Or Replied at :Thursday 31st of January 2013 03:12:57 AM
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i need a ..................[:=> Show Contents <=:]



SPACE LASER COMMUNICATIONS


Posted by: project report helper
Created at: Friday 24th of September 2010 04:50:06 AM
Last Edited Or Replied at :Wednesday 03rd of November 2010 06:35:13 AM
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tellites. The smaller antennas, with diameters typically less than 30cm, create less momentum disturbance to any sensitive satellite sensors. Fewer onboard consumables are required over the long lifetime because th..................[:=> Show Contents <=:]



Optical Communications in Space


Posted by: computer science crazy
Created at: Wednesday 16th of September 2009 02:07:52 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 01:17:43 AM
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ESA selected the CO2 gas laser for its initial work. This laser was the most efficient and reliable laser available at the time and Europe had a considerable background in CO2 laser technology for industrial applications. ESA undertook a detailed design study of a CO2 laser communication terminal and proceeded with the breadboarding of all critical subsystems which were integrated and tested in a complete laboratory breadboard transceiver model.

This laboratory system breadboarding enabled ESA to get acquainted with the intricacies of coherent, free-space optical communication. However, it..................[:=> Show Contents <=:]



Free Space Laser Communications


Posted by: Computer Science Clay
Created at: Sunday 01st of March 2009 02:13:36 AM
Last Edited Or Replied at :Friday 02nd of April 2010 11:54:15 PM
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trum. The laser light across the link is at a wavelength of between 780 - 920 nm. Two parallel beams are used, one for transmission and one for reception.

Acquisition And Tracking
There are three basic steps to laser communication: acquisition, tracking, and communications. Of the three, acquisition is generally the most difficult; angular tracking is usually the easiest. Communications depends on bandwidth or data rate, but is generally easier than acquisition unless very high data rates are required. Acquisition is the most difficult because laser beams are typically much smaller than th..................[:=> Show Contents <=:]



Free Space Laser Communications


Posted by: computer science crazy
Created at: Monday 22nd of September 2008 12:11:49 AM
Last Edited Or Replied at :Tuesday 05th of February 2013 12:32:14 PM
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d modes of operation.

Operation
Free space laser communications systems are wireless connections through the atmosphere. They work similar to fiber optic cable systems except the beam is transmitted through open space. The carrier used for the transmission of this signal is generated by either a high power LED or a laser diode. The laser systems operate in the near infrared region of the spectrum. The laser light across the link is at a wavelength of between 780 - 920 nm. Two parallel beams are used, one for transmission and one for reception.

Acquisition And Tracking
There are three b..................[:=> Show Contents <=:]



Gasoline direct injection or GDI


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:55:43 AM
Last Edited Or Replied at :Saturday 26th of June 2010 08:03:19 AM
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ing efficiency and high-load output-power, the engine power is governed by modulating fuel injection, like a diesel engine; as opposed to restricting intake airflow, like a conventional gas internal combustion engine...................[:=> Show Contents <=:]



BlueTec


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:52:33 AM
Last Edited Or Replied at :Monday 26th of January 2015 04:23:38 AM
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other is called DeNOx and uses an oxidising catalytic converter and particular filter combined with other NOx introduced the systems in the reducing systems. Both systems were designed to slash emissions further than ever before. Mercedes-BenzE-Class (using the 'DeNOx' system) and GL-Class (using 'AdBlue') at the 2006 North American International Auto Show as the E 320 and GL 320 Bluetec. This system makes these vehicles 45-state and 50-state legal respectively in the United States, and is expected to meet all emissions regulations through 2009. It also makes DaimlerChrysler the only car manu..................[:=> Show Contents <=:]



List of mechanical Seminar topics4


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:52:04 AM
Last Edited Or Replied at :Wednesday 12th of November 2014 10:46:52 AM
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iezoelectric Actuators
Electric Cylinders
Visualization and Computer-Aided Design
Thermo Acoustic Refrigeration
Technology-Based Entrepreneurship
Turbofan Engines
Underwater Welding
Directed Energy
mechanosynthesis
Super Air Nozzles
Finite Element Analysis
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Boosting Gas Turbine Energy Efficiency
Flexible Manufacturing Systems
Iontophoresis
Perpetual Motion Machines
Advanced Cooling Systems
Hydrogen Production using Nuclear Energy
Modern Centrifugal Compressors
Pneumatics Control Systems
The Engineering Research Role in..................[:=> Show Contents <=:]



Good Seminars


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 10:22:48 AM
Last Edited Or Replied at :Saturday 20th of September 2008 10:22:48 AM
Seminars, Good ,
ng.

If you put up a slide with an equation, make sure that you read through it so that the audience can follow the notation that you are using. If it's not standard (e.g., F is a production function with inputs of capital and labour) try to give an economic interpretation of the equation.

If you put up a graph, make sure that it's clear what's on the two axes and that you describe what the graph demonstrates.

If you put up a table, make sure that you take one entry and explain clearly what it means in detail and then briefly indicate how to read the remaining entries.

You sho..................[:=> Show Contents <=:]



How to take seminars effectively


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 10:17:19 AM
Last Edited Or Replied at :Saturday 20th of September 2008 10:17:19 AM
effectively , seminars, take ,
of what you will cover (outline!!!)
3) Provide sufficient background so that the audience can appreciate the significance of the paper (who cares???)
4) Use visual aids as appropriate, flow-charts can be very helpful when explaining methods and experimental designs
5) At the close of your seminars be certain to summarize the main conclusions and provide the audience with the most significant point(s) from the seminars* (don't leave the audience wondering why they sat through the seminars)

Clarity

1) Speak clearly and 'speak up' - project your voice without shouting at your audienc..................[:=> Show Contents <=:]



How to face a seminar


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 10:15:31 AM
Last Edited Or Replied at :Monday 01st of September 2014 09:25:55 AM
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u to better internalize your speech...................[:=> Show Contents <=:]



10 tips to take a seminar


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 10:11:25 AM
Last Edited Or Replied at :Monday 01st of September 2014 11:04:02 AM
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pporting information and stories can I use to support each of my main points?
6) What visual aids, if any, do I need?
7) Do I have an effective opening grabber?
In my final summary, how will I plan..................[:=> Show Contents <=:]



At the seminar


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 10:10:09 AM
Last Edited Or Replied at :Friday 25th of March 2011 01:12:46 AM
seminar,
o consideration that you were most likely asked to speak because you have knowledge about the topic.
2) The most important thing --- don't panic. If you can, find a copy of the presentation handouts and scan them, writing down the main topics for each portion of the presentation.
3) This allows you to quickly look at the content of the presentation.
4) If the original speaker planned to use slides, quickly skim each slide and write down the key points.
5) Do not concern yourself with the exact words on the slide.
6) If the slides are properly prepared, each will have only a few key phra..................[:=> 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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ve than underground fibre. But there are a few restrictions, which may mean it remains an alternative. Many engineers are familiar with one of two successful existing technologies for data communication: (1) Guided wave (e.g. fibre optics) and (2) wireless free space communication (e.g. RF). Fibre optics offers extremely high bandwidths for high data rate, while RF communications offers the advantage of wireless connectivity and the ability to broadcast over a wide area. Optical free space communication fits into the 2nd group, but has some properties of the 1st. Many aspects are related to fi..................[:=> Show Contents <=:]



Laser Communication Systems


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:40:09 AM
Last Edited Or Replied at :Friday 02nd of April 2010 11:54:08 PM
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ion of launch weigh. This feature substantially reduces blockage of fields of view of most desirable areas on satellites. The smaller antennas with diameter typically less than 30 centimeters create less momentum disturbance to any sensitive satellite sensors. Fewer on board consumables are required over the long lifetime because there are fewer disturbances to the satellite compared with heavier and larger RF systems. The narrow beam divergence affords interference free and secure operation.



Background
Until recently, the United States government was funding the development of an ope..................[:=> Show Contents <=:]



Free Space Laser Communications


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:13:29 AM
Last Edited Or Replied at :Sunday 21st of September 2008 12:13:29 AM
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are or where the other platform is located, and since everything moves with some degree of uncertainty, they cannot take very long to search or the reference is lost. Instability of the platforms also causes uncertainty in time. In the ideal acquisition method, the beam width of the source is greater than the angle of uncertainty in the location of receiver. The receiver field of includes the location uncertainty of the transmitter. Unfortunately, this ideal method requires a significant amount of laser power.

It is possible to operate a number of laser types at high peak power and low dut..................[:=> Show Contents <=:]



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