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Computer Batteries

Posted by Saboor Adem Tuesday, March 23, 2010 1 comments

Types of batteries

There are three types of computer batteries found on a computer. The first type of battery is the backup battery, which is commonly referred to as the CMOS battery. This battery is what holds your computer's computer settings, such as the time and date. This allows your computer to remember basic computer settings and allows you to boot the computer without entering those settings each time you start the computer.
Next, the bridge battery is only found in portable computers and is used as a temporary backup for the main battery. This allows you to remove the main battery and replace it with a good battery without having to turn off the computer.

The third type of battery is the main battery. The main battery as explained above is also only used with portable computers and is used as an alternate source of power for when the computer is not connected to a standard wall outlet.

Battery technologies

Li-ion:-Short for Lithium-ion, Li-ion is a fragile technology requiring protector circuit, the Li-ion is used where very high energy density is needed and cost is secondary. Li-ion batters are generally more expensive but have never experienced memory issues that have affected other battery technologies.

Pioneering work for the lithium battery began in 1912 by G. N. Lewis but it was not until the early 1970's that the first non-rechargeable lithium batteries became commercially available. Attempts to develop rechargeable lithium batteries followed in the eighties, but failed due to safety concerns.

Lithium is the lightest of all metals, has the greatest electrochemical potential, and provides the largest energy content. Rechargeable batteries using lithium metal as an electrode are capable of providing both high voltage and excellent capacity, resulting in an extraordinary energy density.

After much research during the eighties, it was found that occasional shorts from lithium dendrites could cause thermal run-away. The cell temperature quickly approaches the melting temperature of lithium, which results in violent reactions. A large quantity of rechargeable lithium batteries sent to Japan had to be recalled in 1991 after a battery in a cellular phone exploded and inflicted burns to a man's face.

Because of the inherent instability of lithium metal, especially during charging, research shifted to a non-metallic lithium battery using lithium ions from chemicals such as Lithium-Cobalt Dioxide (LiCoO2 ). Although slightly lower in energy density than with lithium metal, the Li-ion is safe, provided certain precautions are met when charging and discharging. In 1991, Sony commercialized the Li-ion and is presently the largest supplier of this type of battery.

Li-polymer:-Short for Lithium Polymer, Li-polymer is a battery technology that is a lower cost version of the Li-ion that first started being used in 1996.

Nicad-Trademarked name for a Nickel-Cadmium battery owned by SAFT America Inc. Nicad is a type of rechargeable battery, made mostly of of nickel and cadmium. A primary problem with nickel-cadmium batteries was that they needed to be completely drained of power before they could be recharged.
Known as a memory loss or memory effect, if the battery was not completely drained, once the battery reaches its last low level, the battery would go dead, assuming that no power was left.
NiMH:-Short for Nickel-Metal Hydride and also abbreviated as Ni-MH, NiMH is a type of rechargeable battery used primarily in portable computers.

Research of the NiMH system started in the seventies as a means for hydrogen storage for a Nickel Hydrogen battery. The metal hydride alloys were unstable in the cell environment and the desired performance characteristics could not be achieved. As a result, the development of the NiMH slowed down. New hydride alloys were developed in the 1980's that were stable enough for use in a cell. Since the late eighties, the NiMH has steadily improved, mainly in terms of energy density. Design engineers have indicated that the NiMH has a potential of yet higher energy densities.

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What is WiMAX?

Posted by Saboor Adem Monday, March 22, 2010 0 comments

WiMAX or Worldwide Interoperability for Microwave Access, known also as IEEE 802.16, is a telecommunications technology that enables data transmission with broadband speeds and wide coverage without a need for physical connection. WiMAX enables:
-Wireless portable/mobile broadband connectivity.
-Wide cell phone like coverage
-Wireless alternative for cable and DSL last mile broadband access.
-Wireless broadband connection that does not require line-of-sight connection between subscriber and base station.

What is the difference between WiMAX and WiFi?
Distinguishable difference between WiFi and WiMAX are speed and coverage area. Look at the comparison below.
On the technical side, moreover, WiMAX operates on licensed spectrum where frequencies are exclusively allocated to the carriers. Thus, the operators will be able to emit more power without fear of interference. While WiFI, on the other hand, operates on unlicensed spectrum posing the possibility of interfere with other devices. Reportedly, baby monitors and microwave ovens had caused signal overlapping with WiFI.
On the technical side, moreover, WiMAX operates on licensed spectrum where frequencies are exclusively allocated to the carriers. Thus, the operators will be able to emit more power without fear of interference. While WiFI, on the other hand, operates on unlicensed spectrum posing the possibility of interfere with other devices. Reportedly, baby monitors and microwave ovens had caused signal overlapping with WiFI.

How fast is WiMAX compare to current broadband technologies?
Typical WiMAX speed is very competitive compared to prevalent broadband technologies. Considering that most of those technologies are wired, requiring additional cables for operation, WiMAX capabilities show flexibility and velocity at the same time. Consider the following comparison of WiMAX internet with existing and upcoming broadband technologies;

Can WiMAX offer mobile functions?

Yes. Approved in late 2005, the fixed WiMAX 802.16d have now a mobile extension, IEEE 802.16e, optimized for mobile applications. This new standard adds features to WiMAX to support wireless connectivity for moving clients, thus enabling subscribers to access the internet with high speed while in motion. With this standard, devices with built-in mobile WiMAX cards would be able to maintain broadband connection even when they are in the train or a car.

Who offers WiMAX Services? How much does it cost?

In the US, WiMAX broadband for residential and business services are currently offered by the MetroBridge Networks, Towerstream, Valtech Communications, Clearwire, Sprint Nextel, NextWave Wireless, Open Range, Conterra, Open Range Communications, Conterra, RazzoLink, DigitalBridge, Nth Air, NextPhase Wireless ,Rapid Systems, Sling Broadband and Rainbow Broadband in limited areas. WiMAX costs starts from $29 a month for residential and $300 for business plans.

What is the future for WiMAX?

Once widespread, WiMAX can prove its ability to cover a whole city or even a whole country. Undeveloped nations, for example those who cannot still afford nationwide cable infrastructure, would benefit hugely through WiMAX because cable construction is waived. Moreover, the reduced cost and increased coverage would allow financially challenged people to afford internet connection where ever they are. Business oriented people on the other hand would benefit as much, as the mobile broadband service would increase opportunity and stimulation, bringing the internet wherever they are.

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The Easiest Way to Email or Send Large Files to Anyone

Posted by Saboor Adem 0 comments

Miximum 20MB can be sent through email. some time if need to send more than 20 MB, can utilize following link. its easy and free.
The Easiest Way to Email or Send Large Files to Anyone http://www.transferbigfiles.com/

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What does mean 3G ?????

Posted by Saboor Adem Sunday, March 21, 2010 0 comments

Telecommunications companies nowadays, boast about their 3G services and its coverage. But what does a 3G network mean? What is the 3G wireless internet network that we can get through our phones all about? Can we really get mobile internet access comparable to the wired broadband internet? In this article, you would find out the meaning and endeavors of 3G, together with details necessary to appreciate and take advantage of 3G networks.
What is a 3G Network?
Third-generation or 3G, also known as IMT 2000, is a family of radio interfaces which evolved from previous generations to facilitate wider range of services and advanced network capacity. According to the definition of ITU (International Telecommunications Union), 3G includes the following technologies:
  • EDGE (Enhanced Data rates for GSM Evolution)
  • CDMA 2000 (Code Division Multiple Access)
  • UMTS (Universal Mobile Telecommunications System)
  • DECT (Digital Enhanced Cordless Telecommunications)
  • WiMAX (Worldwide Interoperability for Microwave Access)
What is 3G capable of?
It enables network operators to offer subscribers a wider range of advanced services while achieving greater network capacity through increased bandwidth, transfer rates and spectral efficiency. 3G networks are intended to facilitate smart phone advanced capabilities such as the following.
  • Higher data speed
  • Enhanced audio and video streaming
  • Video-conferencing
  • High speed Web and WAP
  • IPTV (TV through the Internet)
How do we use 3G?
To access the 3G network, you need to have 3 things:
  • 3G Compatible Device
  • 3G Network Subscription Plan
  • 3G Coverage
First, you need to have a 3G device which may be a 3G phone or any device with a 3G embedded module. Devices other than 3G mobile phones, such as video cameras, gaming devices and even vending machines are able to accessible to the network as long as it has a 3G embedded module. Furthermore, portable integrated 3G USB modules that would enable laptops to access the network are also available to the market.
Secondly, you need a subscription to a 3G network service provider to get 3G connectivity. These services are often called data plan or network plan. SIM cards or data cards helps the service provider identify its subscribers at this point.
Lastly, to access the 3G phone network you need to be in 3G cities or area where it is available. Through the 3G device and subscription plan, you can access the 3G network whenever within the 3G network. But even if you are not in one, you could still you the previous generation features provided by your carrier because 3G have backwards compatibility. The list of carrier coverage is included on the last part of this article.
What are 3G Mobile Phones?
When we speak of 3G devices, one single device comes to our mind: 3G phones. Simply explained, a 3G phone is any phone which is compatible with the 3G network; it could access the 3G network if given a data plan.
The difference between previous generation phones may not be obvious to the consumers, although there are few similarities among 3G phones which are obviously aimed to maximize the 3G features. They commonly have two cameras, one allowing the users to have video calls and the other for regular camera functions. It also requires a SIM card which enables the service providers to identify the subscribers. Other than that, is usually caters applications that enables video/music download and internet access.
What are SIM cards? And how do we use it?
A SIM or subscriber Identity Module card is a removable memory chip that stores service-subscriber key that is used to identify the subscriber inside a network. It also stores contact numbers, text messages and other data allowing the SIM card user to switch to a new phone easily, by simply inserting the SIM card from the old to the new cell phone.

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Apple iPad -Coming April 03,2010

Posted by Saboor Adem Saturday, March 20, 2010 1 comments

I Pad a magical and revolutionary product at an unbelievable price with most required options. wonderful ..... find the video

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Unlock samsung mobile phone

Posted by Saboor Adem 1 comments

Note: PLEASE BACK UP YOUR FILES BEFORE UNLOCKING
This will also bring the phone to default settings
1. First do a CUSTOM reset: *2767*2878# (star 2767 star 2878 hash) turn off the phone
2. take out the battery and sim and put wrong network SIM and insert a half of it,so it won't ask for network password and shows "Insert SIM" message. Now put the battery ,and switch the phone on .(phone shows "Insert SIM" message.)
3.With out turn off the phone push the sim fully in. At this stage the phone is still asking to "Insert SIM"
4. Make a FULL reset by typing: *2767*3855#(star 2767 star 3855 hash)
5. The phone should reboot working with "wrong" sim inside.
6. Make a Change the NCK password to 8 zeros by typing: *7465625*638*00000000*00000000#(star 7465625 star 638 star 8zeros star 8zeros hash)
7. Now Disable network lock By typing: #7465625*638*00000000#(hash 7465625 star 638 star 8zeros hash) Phone is unlocked (check with *#7465625#)
If you want more goto this link http://a123.07x.net/tutorials/Unlock_Samsung_Mobile/index.htm

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Utilizing google search engines

Posted by Saboor Adem 0 comments

So much information is on the web, its mind boggling. Thankfully we have searchengines to sift through them and catagorize them for us. Unfortunatly, there is still somuch info that even with these search engines, its often a painstakingly slow process(something comparable to death for a hacker) to find exactly what you're looking for.
Lets get right into it.
I use google.com as my primary search engine because it presently tops the charts as far asthe sites that it indexes which means more pertinent info per search.

1. Page translation.Just because someone speaks another language doesn't mean they dont have anything useful to say. I use translation tools like the ones found at http://babelfish.altavista.com and http://world.altavista.com to translate a few key words I am searching for. Be specific and creative because these tools arent the most accurate things on the planet.
2. Directories.These days everything is about $$$. We have to deal/w SEO (search engine optimization) which seems like a good idea on paper until you do a search for toys and get 5 pornsites in the first 10 results. Using a sites directory will eliminate that. You can narrow your search down easily by looking for the info in specific catagories. (PS google DOES have directories, they're at: directory.google.com)
3. Here are some tips that google refers to as "advanced"
A. "xxxx" / will look for the exact phrase. (google isnt case sensitive)
B. -x / will search for something excluding a certain term
C. filetype:xxx / searches for a particular file extention (exe, mp3, etc)
D. -filetype:xxx / excludes a particular file extention
E. allinurl:x / term in the url
F. allintext:x / terms in the text of the page
G. allintitle:x / terms in the html title of that pageH. allinanchor:x / terms in the links
4. ORSelf explanatory, one or the other... (ie: binder OR joiner)
5. ~XSynonyms/similar terms (in case you can't think of any yourself)
6. Numbers in a range.Lets say you're looking for an mp3 player but only want to spend up to $90. Why swim through all the others? MP3 player $0..$90 The 2 periods will set a numeric range to search between. This also works with dates, weights, etc
7. +Ever type in a search and see something like this:"The following words are very common and were not included in your search:"Well, what if those common words are important in your search? You can force google to search through even the common terms by putting a + in front of the denied word.
8. PreferencesIt amazes me when I use other peoples PCs that they dont have their google search preferences saved. When you use google as much as I do, who can afford to not have preferences? They're located on the right of the search box, and have several options, though I only find 2 applicable for myself...A. Open results in new browserB. Display 10-100 results per page. (I currently use 50 per page, but thats a resolution preference, and 5X's the default)
9. *Wildcard searches. Great when applied to a previously mentioned method. If you only know the name of a prog, or are looking for ALL of a particular file (ie. you're DLing tunes) something like *.mp3 would list every mp3.
10. Ever see this?"In order to show you the most relevant results, we have omitted some entries very similar to the X already displayed. If you like, you can repeat the search with the omitted results included." The answer is YES. yes yes yes. Did I mention yes? I meant to.
11. Search EVERYWHEREUse the engine to its fullest. If you dont find your answer in the web section, try the group section. Hell, try a whole different search engine. Dont limit yourself, because sometimes engines seem to intentionally leave results out.ex. use google, yahoo, and altavista. search the same terms... pretty close, right? Now search for disney death. Funny, altavista has plenty of disney, but no death...hmmm.
If you've read this far into this tutorial without saying, "Great, a guy that copied a few google help pages and thinks its useful info" then I will show you WHY (besides accuracy, speed, and consistancy finding info on ANYTHING) its nice to know how a search engine works. You combine it/w your knowledge of other protocol.
Example:Want free music? Free games? Free software? Free movies? God bless FTP! Try this search:intitle:"Index of music" "rolling stones" mp3Substitute rolling stones/w your favorite band. No? Try the song name, or another file format. Play with it. Assuming SOMEONE made an FTP and uploaded it, you'll find it.
For example....I wanted to find some Sepultura. If you never heard them before, they're a Brazilian heavy metal band that kiks ass. I started with this:intitle:"Index of music" "Sepultura" mp3 <-- nothingintitle:"Index of música" "Sepultura" mp3 <-- nothingintitle:"Index of musica" "Sepultura" mp3 <-- not good enoughintitle:"Index of music" "Sepultura" * <-- found great stuff, but not enough Sepultura
t this point it occurs to me that I may be missing something, so I try:intitle:"index of *" "sepultura" mp3 <-- BANG!(and thats without searching for spelling errors)Also try inurl:ftp
I find that * works better for me than trying to guess other peoples mis-spellings.
The same method applies for ebooks, games, movies, SW, anything that may be on an FTP site.
I hope you enjoyed this tutorial, and I saw that recently a book and an article was written on the very same topic. I havn't read them as of yet, but check em out, and get back to me if you feel I missed something important and should include anything else.
intitle:"index of" "google hacks" ebook
Ps. I've said it before, I'll say it again...
BE CREATIVE.You'll be surprised what you can find.

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