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free space laser communications seminar ppt


Posted by:
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 theory for projectof free spac..................[:=> 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
COMMUNICATIONS , LASER, SPACE , space lazer communication, free space laser communications seminar pdf , free space laser communications seminar, subin km free space laser communication seminar report , subin km freespace laser communication seminar, free space laser communications seminar topic , seminar on free space laser communications, laser communications , space laser communications, space laser communication , free space laser communications,
quency (RF) systems. The small antenna size requires only a small increase in the weight and volume of host vehicle. In addition, this feature substantially reduces blockage of fields of view of the most desirable areas on satellites. 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 there is less disturbance to the satellite compared with larger and heavier RF systems. The narrow beam divergence of affords interference-free and secure operatio..................[:=> 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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lowed, conducted under various ESA R&D and support technology programmes. In the mid- 1980 s, ESA took an ambitious step by embarking on the SILEX (Semiconductor laser Intersatellite Link Experiment) programme, to demonstrate a pre-operational optical link in space.

SILEX, which will be in operation in the year 2000, has put ESA in a world-leading position in civilian optical intersatellite links. While SILEX formed the backbone of ESA s optical communications activities in the recent past, additional R&D activities were undertaken to develop attractive second-generation systems, particular..................[:=> 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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les are required over the long lifetime because there is less disturbance to the satellite compared with larger and heavier RF systems. The narrow beam divergence of affords interference-free and secure operation.

Features Of Laser Communications System
A block diagram of typical terminal is illustrated in Fig 1. Information, typically in the form of digital data, is input to data electronics that modulates the transmitting laser source. Direct or indirect modulation techniques may be employed depending on the type of laser employed. The source output passes through an optical system into ..................[:=> 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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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 duty cyc..................[:=> 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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t into the combustion chamber of each cylinder, as opposed to conventional multi point fuel injection that..................[:=> Show Contents <=:]



BlueTec


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:52:33 AM
Last Edited Or Replied at :Friday 24th of May 2013 08:39:36 AM
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he 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 ma..................[:=> 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 :Thursday 18th of March 2010 07:42:03 AM
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Super Air Nozzles
Finite Element Analysis
Diffusion Flame Shapes And Thin Filament Diagnostics
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 Environmental Noise Control
Micro- and Nano-Mechanics of Surface Contact Plasticity
Air Powered Cars
Fuel Energizer
MegaSquirt
Highly Productive And Reconfigurable Manufacturing System(Hiparms)
Aerodynamics
..................[:=> 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 ,
tained in my paper anyhow), point this out right away.

Don't spend too much time on the literature review.The point of the review is to put your paper in perspective. Avoid getting into a long argument about whether you've cited the right group of papers or whether you have misrepresented a literature. You want to talk about your own work, not someone else's.

Present your main contributions right away. It's extremely important that you emphasize your contribution and distinguish what you've done that adds to the literature. You may want to repeat your list of contributions at the end ..................[:=> 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 ,
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 audience
2) State the objectives, hypotheses and rationale of study right at the start of the talk
3) Be certain to relate the seminars to the larger context (Can w..................[:=> 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 :Thursday 06th of March 2014 11:41:15 AM
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their speech, I could have read it myself. I'm sure many of us have experienced this at least once while attending a conference or two. Below are some reasons why I believe people read poorly:

3). Using Notes - This is the most common way for remembering material. Using notes is better than reading since the speaker can have normal voice inflection and make more effective eye contact. If your notes are on the lectern, you probably won't move very far from them. If notes are in your hand, you probably won't gesture very much.

4).Using Visual Aids As Notes - Simple visual aids can effect..................[:=> 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 :Tuesday 23rd of November 2010 10:03:12 PM
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weeks, sleep on it, dream about it and let your ideas sink into your subconscious. Ask yourself questions, write down your thoughts, and keep adding new ideas. As you prepare every speech ask yourself the following questions.

In one concise sentence, what is the purpose of this speech?
1) Who is the audience? What is their main interest in this topic?
2) What do I really know and believe about this topic as it relates to this audience?
3) What additional research can I do?
4) What are the main points of this presentation?
5) What supporting information and stories can I use to su..................[:=> 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,
the following:--

a) List your main points and write down a few key words about each
b) Speak spontaneously and confidently from your heart.
c) Trust your experience and knowledge.
d) Focus on your message and not on the fact that you had to rush to put together a presentation
e) Present your main contributions right away.
f) It's extremely important that you emphasize your contribution and distinguish what you've done that adds to the literature.
g) You may want to repeat your list of contributions at the end of the talk, but don't try to keep the audience in suspense! Let them kno..................[:=> 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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It offers high data rates and is much less expensive 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 pro..................[:=> 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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s-link and for user relay links. NASA's Jet Propulsion Laboratory is studying the development of large space and ground-base receiving stations and payload designs for optical data transfer from interplanetary spacecraft. Space laser communication is beginning to be accepted as a viable and reliable means of transferring data between satellites. Presently, ongoing hardware development efforts include ESA's Space satellite Link Experiment (SILEX) and the Japanese's Laser Communication Experiment (LCE). The United States development programs ended with the termination of both the production of t..................[:=> 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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larger and heavier RF systems. The narrow beam divergence of affords interference-free and secure operation.

Features Of Laser Communications System
A block diagram of typical terminal is illustrated in Fig 1. Information, typically in the form of digital data, is input to data electronics that modulates the transmitting laser source. Direct or indirect modulation techniques may be employed depending on the type of laser employed. The source output passes through an optical system into the channel. The optical system typically includes transfer, beam shaping, and telescope optics. The rece..................[:=> Show Contents <=:]



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