Wednesday, August 12, 2009

Aerial View of the NASA Ames Research Center


Columbia (supercomputer)



Named in honor of the crew who died in the Columbia disaster, Columbia is a supercomputer built by Silicon Graphics for NASA. Its main purpose was to simulate the violent collision and merger of spiral galaxies that lead to the formation of elliptical galaxies. It is connected to the NASA Research and Engineering Network and was installed at the NASA Advanced Supercomputing facility in 2004.
According to the TOP500 list of the fastest supercomputers, it entered the list in November 2004 at position 2, running at 51.87 teraflops, or 51.87 trillion floating point calculations per second. By June 2007 it had dropped to position 13, and by June 2008 was at position 25. It is composed of twenty SGI Altix 3000 nodes running SUSE Linux Enterprise Server 9 each of which has 512 Intel Itanium 2 processors bringing the total number of processors to 10,240. It has 20 terabytes of Random-access memory, 440 terabytes of storage, and 10 petabytes of archive storage.
The SGI Altix platform was selected due to a positive experience with Kalpana, a single Altix 512-CPU system operated by NASA Ames which was integrated into the Columbia supercomputer system.
The computers are connected together with a Voltaire InfiniBand ISR 9288 288 port switch with transfer speeds of up to 10 gigabits (or 1250 megabytes) per second, 10 gigabit Ethernet and multiple 1 gigabit Ethernet nodes.

Thursday, August 6, 2009

Amazing technology

Amazing technology from Japan . . . . but can you guess what it is ?

Look closely and guess what they could be...

Are they pens with cameras?

Any wild guesses? No clue yet?
congratulations! You've just looked into the future... yep that's right! You've just seen something that will replace your PC in the near future. Here is how it works:
In the revolution of miniature computers, scientists have made great developments with bluetooth technology.. . This is the forthcoming computers you can carry within your pockets .
This "pen sort of instrument" produces both the monitor as well as the keyboard on any flat surfaces from where you can carry out functions you would normally do on your desktop computer.

Funny Computers







Mouse...
















Google VS Microsoft....







Keyboard..







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1st Computer of the World




USB Data Recovery software..

for USB Data recovery software click bellow

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Free download Phonetic keyboard..

Free download Phonetic keyboard..

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Serial Nos...

A good appliction for softwares serial nos..
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Free download You tube videos downloader..

Click bellow and get downloader for youtube videos...

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Free download Holy Quraan software..

Click bellow and Get Quran....

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Wednesday, August 5, 2009

A good website for mobile applications

A good website for mobile applications

http://www.funmaza.com/mobile_mania.html

A good website for computer softwares....

A good website for computer softwares....

http://www.funmaza.com/softwares.html

A good website for Information Technology....

A good website for Information Technology....

http://www.itdunya.com/

Computer in 2020 (Video)

video

*2009 "TOP PICK"* Work At Home

*2009 "TOP PICK"* Work At Home Click Here

Are you Searching for a Legitimate Work at Home Opportunity to Earn Money from Home? You Found it!

This Work at Home Directory was created to help others find the best and most legitimate work from home jobs on the Internet. Select one of our "top picks" to start making money!

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The Work at Home Employment and Work From Home Resource Directory is dedicated to provide legitimate work at home jobs, home businesses, and opportunities to people seeking to earn money at home through a work at home business part-time or full-time. Whether your looking for part-time or a full-time income at home you have come to the right place. Either way we can help you reach your goals through this valuable work from home business.



For YOUR PROTECTION all of the jobs listed on this site are members of or at least one of the following organizations.

Each company listed here has been thoroughly researched as a valuable, intregrity assured work at home job/opportunity. You also can create multiple streams of income by working from home. We encourage you to try more than one to find the best fit for you. For example, you could get paid typing data online from home and still get paid for filling out online surveys. The key is to find something where you can earn money at home through a work at home job.

Discover the Power of Your Own Freedom by "Earning Money at Home" with a Work at Home Job!Some of these listings may required a small investment, but we have only listed reputable companies that have a 100% money back guarantee. You do need to unddrstand that there will be some work required on your part to work at home and that this work will be required to be done on a regular basis.

Work at Home

Internet Income

Online Opportunities

Work Online Today#1 WORLDWIDE HOME BASED INTERNET BUSINESS 4 YRS IN A ROW! Company GUARANTEES You will earn money today! No selling. No family/friends contact needed! Work From Home Today. NO risk. NO obligation. BBB Member. Click Here for FREE Information

Top Work for Moms

Create steady income and make good money online. FREE Website, FREE Support, REAL Women. Real success working at home. This is especially good income opportunity for Canadian and US women. Husbands sign your wife up! No obligation. FREE to sign up to work at home! Every year #1 With Work at Home Moms Everywhere! Click Here for FREE Information to Work at Home

Working at Home on the InternetIf you have a home computer and know how to send an email then Yes you too can ride the earn money at home cash explosion. DON'T MISS OUT! We are a legitimate company, offering legitimate work from home data entry job opportunities. Finally work from home on our own terms as little or as much as you want! Anyone can earn money doing this. No experience needed!! Click Here to Earn Money Everyday

Legitimate Work at Home

Stay Home and Work. Be your own boss and work directly from home. No experience or special skills are required! All you will need is a computer and access to the internet to be able to work at home. You will be typing online ads that you submit into online forms. No-Obligation Information! Companys have excellent online programs. Start today!: Click Here for Legitimate Work at Home Jobs

Top Work at Home!

STOP Commuting. START Earning Money at Home.... Work When YOU Want From the Comfort of Your Own Home. This is an excellent Part-time or Full-time earning income opportunity. Start within the hour and work from home. P/T or F/T. Earn as much money as you want. You dtermine how much you money you make. Risk Free! Click Here to Earn Money with Surveys

Top Paid SurveyCompanies want your opinion. Earn muliple streams of online income without a website. Everthing set up for you. Internet Income has never been better. Work YOUR OWN HOURS! Do surveys from the comfort of your home. Review products, restaurants and get paid! P/T or F/T income while WORKING from HOME! A great way to get started making money online! Voted 2009's Top Online Surveys

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Work From Home Online Surveys!Earn up to $350 a day for completing online surveys and participating in forums. New Surveys Daily! Get paid $5 to $75 per survey! No catch, no gimmick. Working from home has never been easier. People needed to give honest opinion for marketing research. Complete several daily and work at home. Start work today! Click Here for Paid Surveys Online

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2009's Top Scam FREE Data EntryWorking at home in data entry is one of the most popular ways to earn money at home and found to be one of the best. We have a database of the best data entry opportunities to make money at home today.. One system of data entry and many other numerous free bonuses that they have added to their product. Included are top quality videos to help you become very successful in a short period of time and be able to work from home RISK FREE. 100 Percent Guarantee. Scam FREE! Click Here for Risk Free Information

Top Online Work#1 WORLDWIDE HOME BASED INTERNET BUSINESS 4 YRS IN A ROW! Company GUARANTEES a successful Home Business before spending any money. No selling. No family/friends contact needed! NO risk. NO obligation. BBB Member. We will provide you with your OWN online store business that you can work at home. Then we'll TRAIN you how to use your store to begin earning money right away! Click Here for Free Sign Up

Customer Service Work at HomeAre you looking for a new career or a way to make extra cash part-time? Ignotius is one the market leaders that supports the largest network of worldwide work-at-home contractors. Hundreds of people every day become an Ignotius Associate and many businesses come to Ignotius for what we offer. Click Here for Free Info

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With SMCorp you Get Part time work available, A 100% FREE Business Coach to help you get started. This company has been around for over 60 years. You also get the opportunity to Earn Massive profits from home and the chance to be your own boss. No More Commuting. You have nothing to lose and everything to gain. Start Working From Home Today! Click Here to Earn Money

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Work at Home Data Entry"Tired of your dead end job? Why not work from home and live the lifestyle you've always dreamed about! Make $250/day, we show you how!" Anyone with a computer and Internet connection can use this powerful system for huge online profits. No website needed. Work at Home with No product needed. Start making profits within hours! Click Here for Data Entry Business

Work at Home OnlineIf you want to have a great career in your own home, let us show you which work from home opportunity is the best for your skills!! Now you can discover why our customers are successful because we match you tosomething you love and can make money with. This Free resource is the perfect way for you to understand how so many people to start making their own work at home business today! Click Here for Free Info

Make Money at Home TodayThis system is very easy. Follow step-by-step instructions. Earn money entering data. Work from the comfort of your own home. No experience necessary. All you need is access to a computer to be able to work at home. Positions Limited! What are you waiting for? Let our System show you the way. Get Started Now! Click Here for Info

Online Work at HomeThis work at home opportunity has never before been offered to the public for FREE! START YOUR OWN ONLINE DOLLAR STORE! Your Own Online Dollar Store Website. Instant Online Store Setup Hundreds of Namebrand Products to Sell. Commission on Every Sale. Work at home online with this fantastic work from home business. Start today! Click Here for Info On Earning Money at Home

Earning Money Income OpportunityDiscover how over 7,000 people became millionaires last year on the Internet! Would you like to find out how to make money with a fully automated website marketing system that you can operate with your own work at home business? Create instant cash flow. $2000-$10,000 Monthly. More flexible schedule. Extra time with your family. No commuting. Retire early. No expereince needed. Get FREE Information Today!! Click Here for Free Sign Up

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Adsense Money

Adsense Money
So, how much will you earn from Adsense? Google says:
"The AdWords ads you are able to display on your content pages are cost-per-click (CPC) ads. This means that advertisers pay only when users click on ads. You'll receive a portion of the amount paid for clicks on AdWords ads on your website. Although we don't disclose the exact revenue share, our goal is to enable publishers to make as much or more than they could with other advertising networks."
The only way to know how much you'll earn is to try it and see. Because there is not a long term contract, you may cancel at any time.

Earn US$ 800 to US$ 2000 per month

Today, everybody who has some internet knowledge can earn US$ 800 to US$ 2000 per month working from home 4 hours per day only. It does not need any investment. This idea of making money online is attractive to many, primarily because of the benefits it offers. Its money from your own home. NO need to listen to your bad boss.
No need to stay 9 a.m to 5 p.m everyday. Time is yours, style is yours. You are your own boss. One doesn’t need to suffer through boring day jobs which offer poor returns for the time invested. Over here on internet, you can even earn US$600 a day without much effort.



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Web Hosting Make Money Online Internet Business Internet Marketing Email Marketing Domain Registration No Degree earn Millions Search Engine Optimization Pay Per Click Ads Online Payments Affiliate Marketing AdWords & AdSense Make Money Online Now




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Why are you making $5 an hour selling coffee behind a counter when you can easily earn the same amount by spending 10 minutes to write an article on your website?
Even if you’re not looking to work full-time at home, the internet offers a viable source of money which can help to supplement your regular income.
I thought it’ll be a good idea to categorize and compile a list of the online money making methods available so that future visitors to Dosh Dosh will have a reference point which provides them with all information they need.
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Free Post Photo classified ads
Click here to post free photo classified ads of mobiles, cars, Laptops, houses, Plots, split AC, motorcycle, Digital Cameras etc Click here to search For Sale Products

START MAKING MONEY NOW:



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Step #1 Develope a Website or Blog
One of the best ways to make money online is to create a website or blog which allows you to earn money from the display of advertisements or the sale of products and services.
The website should have an interesting topic. It can be related to Cooking, Fashion, Astrology, Buying & Selling, technology News, immigration information, travel guide etc.
There are many different types of money making blogs which will help you to make money and you’ll need to pick a model that suits your interests, schedule and skill levels. Best option is Google Adsense Program. If you have some problems in setup of website. Contact us in Lahore at +92-308-4678540 or habib4k@gmail.com

Step # Register with Google Adsense
Your Earning depends upon the visitors on your website. You must provide a good content for your visitors. You must advertise your website properly in order to earn good money.
If you have 500 unique visitors per day , you can earn upto $5 to $7 per day. The total income will be $150 to $200 per month. It all depends upon your website content and its visitors. You must try to attract more than 1000 visitors per day if you want good money. Basically, what it translates to is that if a large proportion of your site's visitors click the ads you'll be making more money. And the best way to do this is to have some popular content in your site, ensuring the links direct users towards popular items as well.
The webmaster simply places a special code in their page and Google AdSense takes care of the rest. Perhaps the most valuable aspect of the system is that robots (specialized computer programs that scan internet pages) analyzes pages that ads will be placed on to determine which ads are most relevant to the page's content. The relevancy of ads placed by AdSense varies on all sorts of criteria, but most ads are usually very relevant to the page on which the ad is displayed. For example, the ads on this page should be related to the internet, advertising, and/or the Google AdSense program itself. For more info:
http://www.google.com/adsense/
Although Google Adsense Program is the best in the world but It is a big company. Sometimes they don't accept every application. Then we have other Pay Per Click Programs offered by other companies.



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Other Pay Per Click Programs
BidVertiser
Place the BidVertiser text ads on your website and make money online by getting paid for every click.


AdBrite
AdBrite, is currently one of the best alternatives there is to Google's adsense. While they do not offer the same large selection of ad formats that Clicksor and Google Adsense provide you they do offer the most commonly used ones. In addition they offer inline page links with have some great click through ratios as well as interstitial full page ads which offer an excellent way to monetize all traffic to your site not just traffic that clicks on your ads. Their payouts are also very competitive. They have more relaxed terms and conditions than Adsense and are much more accepting of smaller publishers including bloggers.
If you're a publisher, use AdBrite to set your own ad rates, and approve or reject every ad that's purchased for your site or just have AdBrite auto accept ever ad. AdBrite enables you to instantly sell ads to your visitors via a "Your Ad Here" link, in addition to selling through AdBrite's marketplace and sales team.

Clicksor
Clicksor is one of the current leaders of the small publisher Adsense competition. They have payouts upto a market leading 85% and unlike a number of alternatives the cost per click bid values are high enough that you can earn a decent income. They are also, in my experience, much more tollerant than Google. Their terms and conditions suggest that you should only place one copy of their code on a page but as long as you only place a single pop-up or DHTML code on a page they seem happy to let you place many context sensitive ad blocks on a single site.


Yahoo YPN

The best adsense alternative, but is open only for US publishers.


FastClick.com
At first look FastClick would appear to be one of the better alternatives to Google's Adsense however, they are one of many online advertising companies that tend to favor the large customers. You'd think companies would have learnt from Google's success and accepted that the way to make money is to target both large and small. Remember Excite? They went the way of the dodo because they only targeted the top 100 companies rather than the small guys who can't afford large TV adverts and have to advertise on the Internet instead. Anyway, I digress. If you can get yourself accepted to FastClick (now called ValueClick) then you will probably be able to run some reasonably high paying adverts on your site but most small website owners will find that FastClick simply aren't interested.

Tribal Fusion

One of the top eCPM advertising network with good payouts. However, only sites with a minimum of 2000 unique hits per day can apply. Rating 4.5/5


RevenuePilot.com
Revenue Pilot is a great alternative to Google's Adsense. They provide a large number of different ad formats and also provide access to a unique "CHECK PRICES" tool which allows you to enter a keyword and see how many advertisers are currently offering ads on this keyword, how much they are bidding and how much Revenue Pilot will pay you. This is an awesome tool that gives you as a publisher the opportunity to carefully optimize your site for maximum payout or as an advertiser to research neglected keywords, see how much others are bidding and so make your advertising budget go as far as possible. As far as I am aware no other Ad provider offers such a useful tool.
Earn Money through Affiliate Programs
123inkjets.com
Store selling Inkjet cartridges, photo paper, cables, toner and other printer-related goods. Earn 27% commission on each sale you generate through a banner or text link on your site.
Affiliate Tips.com
Affiliate directory, reviews on affiliate programs, helpful articles and affilaite marketing tools.
AffiliateSeeking.com
Well organized directory of affiliate programs, organized by category.
AllPosters.com
Sell posters on your Website, earn 25% commission on each poster you sell.
Amazon.com
Amazon.com is an online store specialized in selling books, CDs, DVDs and Videos. When a visitor of your site purchases an item from Amazon.com through a link on your site, you will receive a fee of between 5% and 15% of the purchase price.
Become a TreePadAffiliate and earnmoney!
As a TreePad affiliate you can earn 25% commissions on any sales you make!Grateful to all TreePad users, who have been TreePad's best advertisers, we are now happy to offer you this excellent possibility of earning money. Sign up is free and open to anyone interested.
Clickbank
Promote and sell your own products or promote other products and receive a commision on each sale which you generate.
clixGalore
Build your own affiliate program and boost your sales, leads and website traffic by promoting and building your own large 'pay for performance' sales team.
Commission junction
Over 1000 advertisement programs to choose from. Real-time tracking, reporting and analysis of impressions, get paid monthly by check, etc.
eBay
Online auction house. Earn $5 for each new client who signs up with eBay, earn $0.05 for each bidder at eBay. Also: eBay affiliate University for improving your performance. Limitation: US based affiliates only at this time.
iDonovan.com
Online recruiting company. Pays $ 20-30 USD for each referred sale.
iPowerWeb
Webhosting company. Receive $65 (Tier 1) and $5 (Tier 2) in commission for every new customer
LunarPages Webhosting
Webhosting company. Earn $52.00 for each new customer (Tier 1) and $ 5 (tear 2).
PayDotCom.com
Promote products and earn commissions as a PayDotCom affiliate. PayPal-related.

She will say anything you type.

She will say anything you type.

I sure don't know how they do this! When you move the mouse around, her eyes follow the pointer. When you write something in the left space and then click on "Say it," she says it! You can also change persons doing the talking and the language they speak. ----- Technology! Quite amazing!!!!! !!

http://www.oddcast.com/home/demos/tts/tts_example.php?sitepal

Adobe Reader 8.1.0 / 7.0.9 Final

Adobe Reader 8.1.0 / 7.0.9 Final
View more Adobe Reader screenshots


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License:
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Last Updated:
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Download Adobe Reader

Adobe Reader descriptionAdobe Reader lets you view and print PDF files using Adobe Reader
Adobe Acrobat Reader is free, and freely distributable, software that lets you view and print Portable Document Format (PDF) files. Acrobat Reader also lets you fill in and submit PDF forms online.Adobe Portable Document FormatInvented by Adobe Systems and perfected over 15 years, Adobe Portable Document Format (PDF) lets you capture and view robust information — from any application, on any computer system — and share it with anyone around the world. Reasons to upgrade to Adobe Reader 8:Enjoy a new interface, new tools, and more optionsView information more precisely and efficiently with the redesigned, easier to use Adobe® Reader® 8 interface. Choose the reading mode to fit more content on the screen or the two-up mode to view page spreads without excess space in the middle. Zoom in, pan over, or leverage the loupe feature in Reader 8 to take a closer look. Launch an online, real-time meeting in secondsInstantly collaborate with virtually anyone, anywhere, at any time. Use the Start Meeting button in Reader 8 to access Adobe Acrobat® Connect™ software and deliver online training and support or communicate with remote audiences in real time. Accelerate approvals with new Reader 8 features that include shared document reviews, a streamlined review tracker, and a simple RSS reader. Realize more secure document workflowsBetter
protect documents, forms, and drawings by leveraging Adobe LiveCycle® Policy Server and the new Adobe Online Services Document Center. For the first time, use Reader 8 to digitally sign Adobe PDF documents, allowing recipients to more confidently view and verify the authenticity of PDF files. Save valuable time working with Adobe PDF filesView, print, search, sign, and collaborate on PDF files. Leverage new timesaving markup and review tools in Reader 8, as well as customizable toolbars and combined search and find. Work with 2D GPU accelerationWork faster with Reader 8 using the most popular graphics processing units (GPUs), which enhance scrolling and zooming for the rendering of 2D graphics.Use improved accessibility features Reader 8 helps you meet the accessibility requirements mandated by Section 508 of the amended U.S. Rehabilitation Act. Try the improved read out loud capabilities in Reader 8 or change the reading order of pages or columns after PDF files are tagged to accommodate preferences. Save trees and timeFor large volumes of information, such as technical manuals, use Reader 8 to condense any type of PDF file into a single booklet for printing. Print only the desired pages on two sides of paper or in a smaller type size to save time and natural resources. Access new learning resourcesImmediately access help and product information. Use the new Beyond Adobe Reader start center in Reader 8 to review information, on demand, about how to use Adobe Reader more effectively. Also view regularly updated information about other Adobe products and services. Lower your total cost of ownershipQuickly manage and control Reader 8 deployments using the Adobe Customization Wizard 8, IBM Tivoli, Microsoft Systems Management Server, Windows Group Policy Objects, or Active Directory. Centrally host Reader 8 using Citrix Metaframe Presentation Server or Microsoft Windows Terminal Server. Get expanded platform supportDeliver a reliable experience across computing platforms. Reader 8 will support Microsoft® Windows Vista™*; Windows® 2000 with Service Pack 4; Windows XP Professional, Home Edition, and Tablet PC Edition; Mac OS X v.10.4.3; Solaris™ 9 and 10; AIX® 5.3; HP-UX 11i v1 and v2; Debian and LSB 3.1 Red Hat®; SUSE™, Turbolinux; and Asianux. Here are some key features of "Adobe Portable Document Format": · Open format — De facto standard for more secure, dependable electronic information exchange — recognized by industries and governments around the world. Compliant with industry standards including PDF/A, PDF/X, and PDF/E. · Multiplatform — Viewable and printable on any platform — Macintosh, Microsoft® Windows, UNIX, and many mobile platforms.· Extensible — More than 1,800 vendors worldwide offer PDF-based solutions including creation, plug-in, consulting, training, and support tools. · Trusted and reliable — More than 200 million PDF documents on the web today serve as evidence of the number of organizations that rely on Adobe PDF to capture information.· Maintain information integrity — Adobe PDF files look exactly like original documents and preserve source file information — text, drawings, 3D, full-color graphics, photos, and even business logic — regardless of the application used to create them. · Keep information secure — Digitally sign or password-protect Adobe PDF documents created with Adobe Acrobat® 7.0 or Adobe LiveCycle™ software.· Searchable — Leverage full-text search features to locate words, bookmarks, and data fields in documents. · Accessible — Adobe PDF documents work with assistive technology to help make information accessible to people with disabilities.Requirements:· Intel® Pentium III or equivalent processor · Windows XP Professional, Home Edition, or Tablet PC Edition with Service Pack 2; Microsoft Windows 2000 with Service Pack 4; Windows 2003 Server; or Windows Vista· 128MB of RAM (256MB recommended for complex forms or large documents) · 110MB of available hard-disk space · Microsoft Internet Explorer 6.0 or 7.0, Firefox 1.5 or 2.0, Mozilla 1.7, AOL 9

This is what happens when a father is a Graphic Designer.

This is what happens when a father is a Graphic Designer. See what my daddy has done to me....



Scroll down Please....



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AUTOPILOT

In 1931, American aviator Wiley Post flew his single-engine Lockheed Vega -- the "Winnie Mae" -- around the world in a record eight days, 15 hours and 51 minutes. Post had a navigator by the name of Harold Gatty to help him stay alert and fight fatigue on that historic flight. But when Post became the first person to fly solo around the world in 1933, he had to do everything without an extra pair of hands. The secret to his success, or at least one of his secrets, was a simple autopilot that steered the plane while he rested.


George Stroud/Express/ Getty ImagesAn early autopilot system in an Avro 19 plane, circa 1947.


Autopilots and Avionics
Automatic pilots, or autopilots, are devices for controlling spacecraft, aircraft, watercraft, missiles and vehicles without constant human intervention. Most people associate autopilots with aircraft, so that's what we'll emphasize in this article. The same principles, however, apply to autopilots that control any kind of vessel.

Image courtesy of Bill Harris


In the world of aircraft, the autopilot is more accurately described as the automatic flight control system (AFCS). An AFCS is part of an aircraft's avionics -- the electronic systems, equipment and devices used to control key systems of the plane and its flight. In addition to flight control systems, avionics include electronics for communications, navigation, collision avoidance and weather. The original use of an AFCS was to provide pilot relief during tedious stages of flight, such as high-altitude cruising. Advanced autopilots can do much more, carrying out even highly precise maneuvers, such as landing an aircraft in conditions of zero visibility.
Although there is great diversity in autopilot systems, most can be classified according to the number of parts, or surfaces, they control. To understand this discussion, it helps to be familiar with the three basic control surfaces that affect an airplane's attitude. The first are the elevators, which are devices on the tail of a plane that control pitch (the swaying of an aircraft around a horizontal axis perpendicular to the direction of motion). The rudder is also located on the tail of a plane. When the rudder is tilted to starboard (right), the aircraft yaws -- twists on a vertical axis -- in that direction. When the rudder is tilted to port (left), the craft yaws in the opposite direction. Finally, ailerons on the rear edge of each wing roll the plane from side to side.
Autopilots can control any or all of these surfaces. A single-axis autopilot manages just one set of controls, usually the ailerons. This simple type of autopilot is known as a "wing leveler" because, by controlling roll, it keeps the aircraft wings on an even keel. A two-axis autopilot manages elevators and ailerons. Finally, a three-axis autopilot manages all three basic control systems: ailerons, elevators and rudder.

Autopilot Parts
The heart of a modern automatic flight control system is a computer with several high-speed processors. To gather the intelligence required to control the plane, the processors communicate with sensors located on the major control surfaces. They can also collect data from other airplane systems and equipment, including gyroscopes, accelerometers, altimeters, compasses and airspeed indicators.
The processors in the AFCS then take the input data and, using complex calculations, compare it to a set of control modes. A control mode is a setting entered by the pilot that defines a specific detail of the flight. For example, there is a control mode that defines how an aircraft's altitude will be maintained. There are also control modes that maintain airspeed, heading and flight path.
The Invention of Autopilot
Famous inventor and engineer Elmer Sperry patented the gyrocompass in 1908, but it was his son, Lawrence Burst Sperry, who first flight-tested such a device in an aircraft. The younger Sperry's autopilot used four gyroscopes to stabilize the airplane and led to many flying firsts, including the first night flight in the history of aviation. In 1932, the Sperry Gyroscope Company developed the automatic pilot that Wiley Post would use in his first solo flight around the world.
These calculations determine if the plane is obeying the commands set up in the control modes. The processors then send signals to various servomechanism units. A servomechanism, or servo for short, is a device that provides mechanical control at a distance. One servo exists for each control surface included in the autopilot system. The servos take the computer's instructions and use motors or hydraulics to move the craft's control surfaces, making sure the plane maintains its proper course and attitude.

Image courtesy Bill Harris

The above illustration shows how the basic elements of an autopilot system are related. For simplicity, only one control surface -- the rudder -- is shown, although each control surface would have a similar arrangement. Notice that the basic schematic of an autopilot looks like a loop, with sensors sending data to the autopilot computer, which processes the information and transmits signals to the servo, which moves the control surface, which changes the attitude of the plane, which creates a new data set in the sensors, which starts the whole process again. This type of feedback loop is central to the operation of autopilot systems.

Autopilot Control Systems
An autopilot is an example of a control system. Control systems apply an action based on a measurement and almost always have an impact on the value they are measuring. A classic example of a control system is the negative feedback loop that controls the thermostat in your home. Such a loop works like this:


1. It's summertime, and a homeowner sets his thermostat to a desired room temperature -- say 78°F.
2. The thermostat measures the air temperature and compares it to the preset value.
3. Over time, the hot air outside the house will elevate the temperature inside the house. When the temperature inside exceeds 78°F, the thermostat sends a signal to the air conditioning unit.
4. The air conditioning unit clicks on and cools the room.
5. When the temperature in the room returns to 78°F, another signal is sent to the air conditioner, which shuts off.


It's called a negative feedback loop because the result of a certain action (the air conditioning unit clicking on) inhibits further performance of that action. All negative feedback loops require a receptor, a control center and an effector. In the example above, the receptor is the thermometer that measures air temperature. The control center is the processor inside the thermostat. And the effector is the air conditioning unit.


Image courtesy Bill Harris
Automated flight control systems work the same way. Let's consider the example of a pilot who has activated a single-axis autopilot -- the so-called wing leveler we mentioned earlier.


1. The pilot sets a control mode to maintain the wings in a level position.
2. However, even in the smoothest air, a wing will eventually dip.
3. Position sensors on the wing detect this deflection and send a signal to the autopilot computer.
4. The autopilot computer processes the input data and determines that the wings are no longer level.
5. The autopilot computer sends a signal to the servos that control the aircraft's ailerons. The signal is a very specific command telling the servo to make a precise adjustment.
6. Each servo has a small electric motor fitted with a slip clutch that, through a bridle cable, grips the aileron cable. When the cable moves, the control surfaces move accordingly.
7. As the ailerons are adjusted based on the input data, the wings move back toward level.
8. The autopilot computer removes the command when the position sensor on the wing detects that the wings are once again level.
9. The servos cease to apply pressure on the aileron cables.
This loop, shown above in the block diagram, works continuously, many times a second, much more quickly and smoothly than a human pilot could. Two- and three-axis autopilots obey the same principles, employing multiple processors that control multiple surfaces. Some airplanes even have autothrust computers to control engine thrust. Autopilot and autothrust systems can work together to perform very complex maneuvers.

Autopilot Failure
Digital Vision/Getty ImagesAutopilots can control a planemuch more smoothly thanhuman pilots can.­
Autopilots can and do fail. A common problem is some kind of servo failure, either because of a bad motor or a bad connection. A position sensor can also fail, resulting in a loss of input data to the autopilot computer. Fortunately, autopilots for manned aircraft are designed as a failsafe -- that is, no failure in the automatic pilot can prevent effective employment of manual override. To override the autopilot, a crew member simply has to disengage the system, either by flipping a power switch or, if that doesn't work, by pulling the autopilot circuit breaker.
Some airplane crashes have been blamed on situations where pilots have failed to disengage the automatic flight control system. The pilots end up fighting the settings that the autopilot is administering, unable to figure out why the plane won't do what they're asking it to do. This is why flight instruction programs stress practicing for just such a scenario. Pilots must know how to use every feature of an AFCS, but they must also know how to turn it off and fly without it. They also have to adhere to a rigorous maintenance schedule to make sure all sensors and servos are in good working order. Any adjustments or fixes in key systems may require that the autopilot be tweaked. For example, a change made to gyro instruments will require realignment of the settings in the autopilot's computer.


The John F. Kennedy Jr. Crash
There has been much speculation about what caused the plane crash that killed John F. Kennedy Jr., along with his wife, Carolyn Bessette Kennedy, and her sister, Lauren Bessette, on July 16, 1999. Although the National Transportation Safety Board (NTSB) determined the probable cause of the accident to be pilot error due to spatial disorientation, some insist that a mechanical failure -- perhaps even a failure related to the autopilot -- contributed to the wreck.­
The plane, a Piper PA-32R-301, Saratoga II, N9253N, was equipped with a Bendix/King 150 Series Automatic Flight Control System, a two-axis autopilot that controlled pitch and roll. The investigation by the NTSB revealed that the autopilot had malfunctioned once or twice before the accident, turning the airplane to a new heading. The problem required that the autopilot be disengaged and then reengaged.
While such a problem with the autopilot could have contributed to the events leading to the wreck, it seems unlikely. In fact, some reports indicate that the autopilot had already been disengaged before the plane encountered problems.


Modern Autopilot Systems
Many modern autopilots can receive data from a Global Positioning System (GPS) receiver installed on the aircraft. A GPS receiver can determine a plane's position in space by calculating its distance from three or more satellites in the GPS network. Armed with such positioning information, an autopilot can do more than keep a plane straight and level -- it can execute a flight plan.


Digital Vision/Getty Images

The newest autopilots can execute an entire flight plan.


Most commercial jets have had such capabilities for a while, but even ­smaller planes are incorporating sophisticated autopilot systems. New Cessna 182s and 206s are leaving the factory with the Garmin G1000 integrated cockpit, which includes a digital electronic autopilot combined with a flight director. The Garmin G1000 delivers essentially all the capabilities and modes of a jet avionics system, bringing true automatic flight control to a new generation of general aviation planes.
Wiley Post could have only dreamed of such technology back in 1933.
For more information about autopilots, check out the links on the next page.
Cruise Control -- Autopilot for Your Car
Autopilots aren't found only on airplanes. Ships have them, too, although they are often known by different names. Some captains refer to their ship's autopilot as "Metal Mike," a playful name that arose soon after Elmer Sperry invented the gyrocompass.
Others refer to the device as an "autohelmsman" because it assumes the role of helmsman, steering the ship efficiently with no human intervention. Even your car, if it's a later model, has an autopilot system. It's called cruise control, and it's another classic example of a control system. Cruise control automatically regulates the speed of your car using a feedback loop that involves a speed sensor and the car's accelerator.

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Monday, August 3, 2009

What is a Computer??

This document includes a brief overview of basic computing concepts. It is the first in a series of three self-instruction Internet tutorials produced by the Bedford Public Library.You can scroll through the document or jump to any of the topics listed below. You can also print the entire document by printing this page.
What is a Computer?
Software and Hardware
Hardware Components
Hardware Accessories
Operating System Software
Software ApplicationsReference



What is a Computer?

Computers are not very intelligent devices, but they handle instructions flawlessly and fast. They must follow explicit directions from both the user and computer programmer. Computers are really nothing more than a very powerful calculator with some great accessories. Applications like word processing and games are just a very complex math problem.

Software and HardwareIf you use a player piano as an analogy, the piano can be thought of as the hardware and the roll of music as the software.The software a series of very simple computer instructions carefully organized to complete complex tasks. These instructions are written in programming languages (like BASIC, PASCAL, C...) to help simplify the development of applications.The hardware is what sits on your desk and executes the software instructions. The player piano is useless unless the roll of music has been written correctly.
Hardware ComponentsInput Devices -- "How to tell it what to do"
- A keyboard and mouse are the standard way to interact with the computer. Other devices include joysticks and game pads used primarly for games.
Output Devices -- "How it shows you what it is doing"
- The monitor (the screen) is how the computer sends information back to you, whether it be surfing the web or writing a memo. A printer is also an output device.
Storage Devices -- "How it saves data and programs"
- Hard disk drives are an internal, higher capacity drive which also stores the operating system which runs when you power on the computer.



- "Floppy" disk drives allow you to save work on small disks and take the data with you.
Memory -- "How the processor stores and uses immediate data"
- When you use a program, the computer loads a portion of the program from the hard drive to the much faster memory (RAM). When you "save" your work or quit the program, the data gets written back to the hard drive.
Microprocessors -- "The brain of the computer"

PCs primarily use microprocessors (sometimes called the chip) manufactured by Intel. The older Intel versions include the 386, 486 and now the Pentium line.- Macintoshes use PowerPC processors by Motorola.- Megahertz (MHz) is the internal processor speed in which computer instructions are performed. The MHz speed does not always indicate the power of the microprocessor. Newer processors can execute more instructions at the same or slower MHz. For example, an Intel 486 @100MHz is less powerful than a Pentium @75 MHz (but the MHz is "faster").
Hardware AccessoriesModems
- Modems allow you to communicate with other computers using a phone line. Modem speeds are in bits per second (14.4, 28.8 and 56 thousand bits per second are standard).
CD-ROM Drives
- A CD-ROM drive is a high capacity storage device which lets you read data from the disk, but not write data back. The speed of the drive (how fast the CD platter spins) is measured in multiples from the first generation drives. New drives are up to 24X (or 24 times the first drives), but while the CD spins faster, it is not really 24 times faster in actual output.
Printers
- There are different types of printers (laser, ink jet, dot matrix) with differing quality of output. They are measured in dpi (dots per inch) and ppm (pages per minute), the higher the better.


Scanners
- Scanners "digitize" printed material (like photos and graphics) and save it to a graphic file format (like .GIF or .JPG) for display on the computer.
Operating System SoftwareOperating system software provides a "user interface" for users to manage files, start programs, customize computer settings, and other tasks. The operating system also provides the fundamental core computer functionality for programmers.Intel based PCs use Microsoft Windows version 3.1 (older) or Windows 95 as the operating system. Macintoshes use the Macintosh operating system.
Software ApplicationsApplication software uses the operating system software and provides the real functionality of a computer. Applications include:
- Word Processing (MS Word, WordPerfect, Ami...)- Spreadsheets (Lotus 123, MS Excel...)- Database (DBase, Fox Pro, Oracle...)- Presentation (MS PowerPoint, Persuasion.. .)- Internet Browsers (Netscape Navigator, MS Internet Explorer)- Games
Thnak Muhammad Shoaib Khattak
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