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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 theory for projectof free space las..................[:=> 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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s disturbance to the satellite compared with larger and heavier RF systems. The narrow beam divergence of affords interference-free and secure operation.

..................[:=> 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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tudy contract in the domain of intersatellite optical links. Now, twenty years later, a major milestone has been reached with the SILEX laser terminals having been flight tested for integration with their host spacecraft. At the same time, ESA is preparing itself for a new challenge: the potential massive use of optical cross links in satellite constellations for mobile communications and global multimedia services. This is an opportune moment to look back at the past twenty years of ESA effort in laser communications, to take stock of the results achieved and to reflect on ways to face the ch..................[:=> 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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possible to operate a number of laser types at high peak power and low duty cycle to make acquisition easier. This is because a lower pulse rate is needed for acquisition than for tracking and communications. High peak power pulses more easily overcome the receiver set threshold and keep the false alarm rate low. A low duty cycle transmitter gives high peak power, yet requires less average power, and is thus a suitable source for acquisition. As the uncertainty area becomes less, it becomes more feasible to use a continues source of acquisition, especially if the acquisition time does not hav..................[:=> 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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s 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 cycle to make acquisition easier. This is because a lower pulse rate is needed for acquisition than for tracking and communications. High peak power pulses more easily overcome the receiver set threshold and keep the false alarm rate low. A low duty cycle transmitter gives high peak power, yet requires less average power, and is thus a suitable source for acquisition. As the uncertainty..................[:=> 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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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 :Friday 24th of May 2013 08:39:36 AM
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reducing systems, for use in their Diesel automobile engines. One is a urea catalyst called AdBlue, the 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 e..................[:=> 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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ng of Plastics and Thermoforming
Performance Analysis of Manufacturing Systems
ConCurrent Engineering
Diesel Particulate Filter
Weber carburetors
Corrugated Metals
Future of FEA iN MAnufacturing
Butterfly valvecatalytic converter
VTEC
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Automation in building construction, agriculture etc
Precision manufacturing and Inspection
Reliability and risk analysis
Optimisation of Mechanical Systems
Cruise missile technology
Fast breeder reactor technology
Advanced safety features in nuclear reac..................[:=> 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 ,
ill have a good idea of what you want them to take away from your talk.

If you have a model in your paper that is involved and difficult to follow, try to present a stripped down version in the presentation that you can use to develop the intuition for the main findings. Then you can say that in the paper you show that the intuition extends to a richer setting.

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 labou..................[:=> 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 ,
nitial hypothesis.

Organization

1) Be straightforward and logical, think of it as telling a story - you want a less expert audience to be able to follow along
2) Be certain to start with a brief introductory summary 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 ..................[:=> 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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ake practice, but practicing using only these few words will force you 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 :Tuesday 23rd of November 2010 10:03:12 PM
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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 support each of my main points?
6) What..................[:=> 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,
t 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 phrases --your talking ..................[:=> 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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terference with existing electromagnetic equipment because interference on narrow band point-to-point connections is rather unlikely.

But there are as well some limitations:
_ Absorption (caused primarily by the water vapor and carbon dioxide)
_ Scattering (depends of the used wavelength and the number and size of scattering elements in the air e.g. fog)
_ Shimmer (due to a combination of factors, including atmospheric turbulence, air density, light refraction, cloud cover, and wind which cause a similar disturbance when a laser beam is transmitted through the atmosphere)
_ Moving buil..................[:=> 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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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 operational space laser cross-link system employing solid-state laser technology. The NASA is developing technology and studying the applicability of space laser communication to NASA's tracking and data relay network both as cross-link and for user relay links. NASA's Jet Propulsion Laboratory is studying the development of large s..................[:=> 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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large information throughput available with laser communications are many times greater than in radio frequency (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 wi..................[:=> Show Contents <=:]



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