Wireless communication is the transfer of information over a distance without the use of electrical conductors or "wires".The distances involved may be short (a few meters as in television remote control) or long (thousands or millions of kilometers for radio communications). When the context is clear, the term is often shortened to "wireless". Wireless communication is generally considered to be a branch of telecommunications.
It encompasses various types of fixed, mobile, and portable two way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of wireless technology include GPS units, garage door openers and or garage doors, wireless computer mice, keyboards and headsets, satellite television and cordless telephones.

Introduction

Handheld wireless radios such as this Maritime VHF radio transceiver use electromagnetic waves to implement a form of wireless communications technology.
Wireless operations permits services, such as long range communications, that are impossible or impractical to implement with the use of wires. The term is commonly used in the telecommunications industry to refer to telecommunications systems (e.g., radio transmitters and receivers, remote controls, computer networks, network terminals, etc.) which use some form of energy (e.g. radio frequency (RF), infrared light, laser light, visible light, acoustic energy, etc.) to transfer information without the use of wires.Information is transferred in this manner over both short and long distances.

Wireless communication

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The term "wireless" has become a generic and all-encompassing word used to describe communications in which electromagnetic waves or RF (rather than some form of wire) carry a signal over part or the entire communication path. Common examples of wireless equipment in use today include:
Professional LMR (Land Mobile Radio) and SMR (Specialized Mobile Radio) typically used by business, industrial and Public Safety entities
Consumer Two Way Radio including FRS (Family Radio Service), GMRS (General Mobile Radio Service) and Citizens band ("CB") radios
The Amateur Radio Service (Ham radio)
Consumer and professional Marine VHF radios
Cellular telephones and pagers: provide connectivity for portable and mobile applications, both personal and business.
Global Positioning System (GPS): allows drivers of cars and trucks, captains of boats and ships, and pilots of aircraft to ascertain their location anywhere on earth.
Cordless computer peripherals: the cordless mouse is a common example; keyboards and printers can also be linked to a computer via wireless.
Cordless telephone sets: these are limited-range devices, not to be confused with cell phones.
Satellite television: allows viewers in almost any location to select from hundreds of channels.
Wireless gaming: new gaming consoles allow players to interact and play in the same game regardless of whether they are playing on different consoles. Players can chat, send text messages as well as record sound and send it to their friends. Controllers also use wireless technology. They do not have any cords but they can send the information from what is being pressed on the controller to the main console which then processes this information and makes it happen in the game. All of these steps are completed in milliseconds.

bollywood movies

Bollywood is the informal term popularly used for the Mumbai-based Hindi language film industry in India. The term is often incorrectly used to refer to the whole of Indian cinema; it is only a part of the Indian film industry.Bollywood is the largest film producer in India and one of the largest in the world.
The name is a portmanteau of Bombay (the former name for Mumbai) and Hollywood, the center of the American film industry.However, unlike Hollywood, Bollywood does not exist as a physical place. Though some deplore the name, arguing that it makes the industry look like a poor cousin to Hollywood,it has its own entry in the Oxford English Dictionary.
Bollywood is often referred to as Hindi cinema, even though frequent use of poetic Urdu words is fairly common. There has been a growing presence of Indian English in dialogue and songs as well. It is not uncommon to see films that feature dialogue with English words and phrases, even whole sentences. There is a growing number of films made entirely in English.

History

The first Indian sound film, Ardeshir Irani's Alam Ara (1931)
Raja Harishchandra (1913), by Dadasaheb Phalke, was the first silent feature film made in India. By the 1930s, the industry was producing over 200 films per annum. The first Indian sound film, Ardeshir Irani's Alam Ara (1931), was a major commercial success. There was clearly a huge market for talkies and musicals; Bollywood and all the regional film industries quickly switched to sound filming.
The 1930s and 1940s were tumultuous times: India was buffeted by the Great Depression, World War II, the Indian independence movement, and the violence of the Partition. Most Bollywood films were unabashedly escapist, but there were also a number of filmmakers who tackled tough social issues, or used the struggle for Indian independence as a backdrop for their plots.
In 1937, Ardeshir Irani, of Alam Ara fame, made the first colour film in Hindi, Kisan Kanya. The next year, he made another colour film, Mother India. However, colour did not become a popular feature until the late 1950s. At this time, lavish romantic musicals and melodramas were the staple fare at the cinema. Successful actors included Dev Anand, Dilip Kumar and Raj Kapoor and actresses like Nargis, Meena Kumari, Nutan and Madhubala. In the late 1960s and early 1970s, romance movies and action films starred actors like Rajesh Khanna and Dharmendra. In the mid-1970s, romantic confections made way for gritty, violent films about gangsters and bandits. Amitabh Bachchan, the star known for his "angry young man" roles, rode the crest of this trend with actors like Mithun Chakraborty and Anil Kapoor, which lasted into the early 1990s. Actresses from this era included Hema Malini, Jaya Bachchan and Rekha.
In the mid-1990s, the pendulum swung back toward family-centric romantic musicals with the success of such films as Hum Aapke Hain Kaun (1994) and Dilwale Dulhania Le Jayenge (1995) making stars out of a new generation of actors (such as Aamir Khan, Salman Khan and Shahrukh Khan) and actresses (such as Sridevi, Madhuri Dixit,Juhi Chawla and Kajol.In that point of time, action and comedy films were also successful, with actors like Govinda and Akshay Kumar and actresses such as Raveena Tandon and Karisma Kapoor appearing in films of this genre. Furthermore, this decade marked the entry of new performers in art and independent films, some of which succeeded commercially. These films featured actors like Nana Patekar, Manisha Koirala, Tabu and Urmila Matondkar, whose performances were usually acclaimed by critics.

Bollywood song and dance

Songs in Bollywood are sung by professional playback singers, rather than actors, who lip-sync the lyrics. Pictured here is Mukesh, a famed playback singer.
Bollywood film music is called filmi music (from Hindi, meaning "of films").
Songs from Bollywood movies are generally pre-recorded by professional playback singers, with the actors then lip synching the words to the song on-screen, often while dancing. While most actors, especially today, are excellent dancers, few are also singers. One notable exception was Kishore Kumar, who starred in several major films in the 1950s while also having a stellar career as a playback singer. K. L. Saigal, Suraiyya, and Noor Jehan were also known as both singers and actors. Some actors in the last thirty years have sung one or more songs themselves; for a list, see Singing actors and actresses in Indian cinema.
Playback singers are prominently featured in the opening credits and have their own fans who will go to an otherwise lackluster movie just to hear their favourites. Going by the quality as well as the quantity of the songs they rendered, most notable singers of Bollywood are Lata Mangeshkar, Asha Bhosle, Geeta Dutt, Shamshad Begum and Alka Yagnik among female playback singers; and K. L. Saigal, Talat Mahmood, Mukesh, Mohammed Rafi, Manna Dey, Hemant Kumar, Kishore Kumar, Kumar Sanu,S.P.Balasubramanyam,Udit Narayan and Sonu Nigam among male playback singers. Mohammed Rafi is often considered arguably the finest of the singers that have lent their voice to Bollywood songs, followed by Lata Mangeshkar, who, through the course of a career spanning over six decades, has recorded thousands of songs for Indian movies. The composers of film music, known as music directors, are also well-known. Their songs can make or break a film and usually do. Remixing of film songs with modern beats and rhythms is a common occurrence today, and producers may even release remixed versions of some of their films' songs along with the films' regular soundtrack albums.

The Core brand refers to Intel's 32-bit mobile dual-core x86 CPUs that derived from the Pentium M branded processors. The processor family used a more advanced version of the Intel P6 microarchitecture. It emerged in parallel with the NetBurst (Intel P68) microarchitecture of the Pentium 4 brand, and was a precursor of the 64-bit Core microarchitecture of Core 2 branded CPUs. The Core brand comprised two branches: the Duo (dual-core) and Solo (Duo with one disabled core, which replaced the Pentium M brand of single-core mobile processor).
The Core brand was launched on January 5, 2006 by the release of the 32-bit Yonah CPU - Intel's first dual-core mobile (low-power) processor. Its dual-core layout closely resembled two interconnected Pentium M branded CPUs packaged as a single die (piece) silicon chip (IC). Hence, the 32-bit microarchitecture of Core branded CPUs - contrary to its name - had more in common with Pentium M branded CPUs than with the subsequent 64-bit Core microarchitecture of Core 2 branded CPUs. Despite a major rebranding effort by Intel starting January 2006, some computers with the Yonah core continued to be marked as Pentium M.
The Core Duo is also famous for being the first Intel processor to ever be used in Apple Macintosh computers. Core Duo signified the beginning of Apple's shift to Intel processors across their entire line.
In 2007, Intel began branding the Yonah core CPUs intended for mainstream mobile computers as Pentium Dual-Core. These are not to be confused with the desktop 64-bit Core microarchitecture CPUs also branded as Pentium Dual-Core.

A hard disk drive (HDD), commonly referred to as a hard drive, hard disk, or fixed disk drive is a non-volatile storage device which stores digitally encoded data on rapidly rotating platters with magnetic surfaces. Strictly speaking, "drive" refers to a device distinct from its medium, such as a tape drive and its tape, or a floppy disk drive and its floppy disk. Early HDDs had removable media; however, an HDD today is typically a sealed unit (except for a filtered vent hole to equalize air pressure) with fixed media.
HDDs (introduced in 1956 as data storage for an IBM accounting computer) were originally developed for use with general purpose computers. During the 1990s, the need for large-scale, reliable storage, independent of a particular device, led to the introduction of embedded systems such as RAID arrays, network attached storage (NAS) systems and storage area network (SAN) systems that provide efficient and reliable access to large volumes of data. In the 21st century, HDD usage expanded into consumer applications such as camcorders, cellphones, digital audio players, digital video players (e.g. the iPod Classic), digital video recorders, personal digital assistants and video game consoles.

HD heads are kept from contacting the platter surface by the air that is extremely close to the platter; that air moves at, or close to, the platter speed.[citation needed] The record and playback head are mounted on a block called a slider, and the surface next to the platter is shaped to keep it just barely out of contact. It's a type of air bearing.
The magnetic surface of each platter is conceptually divided into many small sub-micrometre-sized magnetic regions, each of which is used to encode a single binary unit of information. In today's HDDs, each of these magnetic regions is composed of a few hundred magnetic grains. Each magnetic region forms a magnetic dipole which generates a highly localized magnetic field nearby. The write head magnetizes a region by generating a strong local magnetic field. Early HDDs used an electromagnet both to generate this field and to read the data by using electromagnetic induction. Later versions of inductive heads included metal in Gap (MIG) heads and thin film heads. In today's heads, the read and write elements are separate, but in close proximity, on the head portion of an actuator arm. The read element is typically magneto-resistive while the write element is typically thin-film inductive.
In modern drives, the small size of the magnetic regions creates the danger that their magnetic state might be lost because of thermal effects. To counter this, the platters are coated with two parallel magnetic layers, separated by a 3-atom-thick layer of the non-magnetic element ruthenium, and the two layers are magnetized in opposite orientation, thus reinforcing each other.
Another technology used to overcome thermal effects to allow greater recording densities is perpendicular recording, first shipped in 2005[6], as of 2007 the technology was used in many HDDs.

windows vista

Windows Vista is a line of operating systems developed by Microsoft for use on personal computers, including home and business desktops, laptops, Tablet PCs, and media center PCs. Prior to its announcement on July 22, 2005, Windows Vista was known by its codename "Longhorn". Development was completed on November 8, 2006; over the following three months it was released in stages to computer hardware and software manufacturers, business customers, and retail channels. On January 30, 2007, it was released worldwide, and was made available for purchase and download from Microsoft's website.The release of Windows Vista came more than five years after the introduction of its predecessor, Windows XP, the longest time span between successive releases of Microsoft Windows.
Windows Vista contains many changes and new features, including an updated graphical user interface and visual style dubbed Windows Aero, improved searching features, new multimedia creation tools such as Windows DVD Maker, and redesigned networking, audio, print, and display sub-systems. Vista also aims to increase the level of communication between machines on a home network, using peer-to-peer technology to simplify sharing files and digital media between computers and devices. Windows Vista includes version 3.0 of the .NET Framework, which aims to make it significantly easier for software developers to write applications than with the traditional Windows API.
Microsoft's primary stated objective with Windows Vista, however, has been to improve the state of security in the Windows operating system. One common criticism of Windows XP and its predecessors has been their commonly exploited security vulnerabilities and overall susceptibility to malware, viruses and buffer overflows. In light of this, Microsoft chairman Bill Gates announced in early 2002 a company-wide "Trustworthy Computing initiative" which aims to incorporate security work into every aspect of software development at the company. Microsoft stated that it prioritized improving the security of Windows XP and Windows Server 2003 above finishing Windows Vista, thus delaying its completion.
While these new features and security improvements have garnered positive reviews, Vista has also been the target of much criticism and negative press. Criticism of Windows Vista has targeted its high system requirements, its more restrictive licensing terms, the inclusion of a number of new digital rights management technologies aimed at restricting the copying of protected digital media, lack of compatibility with some pre-Vista hardware and software, and the number of authorization prompts for User Account Control. As a result of these and other issues, Windows Vista has seen adoption and satisfaction rates lower than Windows XP.However Vista is keeping well up with expectations stated by Microsoft before its launch of getting 200 million users by January 2009.

Demographics of the United States

The United States is an urbanized nation, with 80.8% of its population of 305,186,613[1] residing in cities and suburbs as of mid-year 2005.[2] The mean population center of the United States has consistently shifted westward and southward, with California and Texas currently the most populous states. U.S. population growth is among the highest in developed countries, although its annual rate of 0.88% is below the world average annual rate of 1.16%.The total fertility rate in the United States estimated for 2008 is 2.1, which is roughly the replacement level for industrialized countries. However, the U.S. Census bureau states that the population is projected to reach 439 million in 2050,which is a 44% increase from 2008 compared to the UN projection of a world population increase of 37% for the same period. Children (people under age 18) made up a quarter of the U.S. population (24.6%), and people over age 65 one-eighth (12.7%) in 2006.

Population growth
The first U.S. census, in 1790, recorded four million Americans. By 2000, this number had grown to over 281 million. It is expected to reach 308 million by 2010 and 439 million by 2050.

U.S. population clock hits the 300 million mark

US population reaches 300 million
The total U.S. population crossed the 100 million mark around 1915, the 200 million mark in 1967, and the 300 million mark in 2006 (estimated on Tuesday, October 17).[6][7] The U.S. population more than tripled during the 20th century — a growth rate of about 1.3% a year — from about 76 million in 1900 to 281 million in 2000. This is unlike most European countries, especially Germany, Russia, Italy and Greece, whose populations are slowly declining, and whose fertility rates are below replacement.
Population growth is fastest among minorities, and according to the United States Census Bureau's estimation for 2005, 45% of American children under the age of 5 are minorities.[8] In 2007, the nation's minority population reached 102.5 million.[9] A year before, the minority population totaled 100.7 million. Hispanic and Latino Americans accounted for almost half (1.4 million) of the national population growth of 2.9 million between July 1, 2005, and July 1, 2006.

Based on a population clock maintained by the U.S. Census Bureau, the current U.S. population, as of 2:30 GMT (EST+5) October 22, 2008 is 305,468,880.A 2004 U.S. Census Bureau report predicted an increase of one third by the year 2050.A subsequent 2008 report projects a population of 439 million, which is a 44% increase from 2008.
As of November 2008 the US comprises approximately 4.5% of the world's population.
Cities
United States metropolitan area and List of United States cities by population
The United States has dozens of major cities, including 11 of the 55 global cities of all types — with three "alpha" global cities: New York City, Los Angeles and Chicago.
The following table expresses the figures for the populations of the top ten cities and their metropolitan areas, as of July 1, 2006.