Création des Logiciels de gestion d'Entreprise, Création et référencement des sites web, Réseaux et Maintenance, Conception
Seo Master present to you: 
A computer is a general purpose device that can be programmed to carry out a finite set of arithmetic or logical operations. Since a sequence of operations can be readily changed, the computer can solve more than one kind of problem.
Conventionally, a computer consists of at least one processing element, typically a central processing unit (CPU) and some form of memory. The processing element carries out arithmetic and logic operations, and a sequencing and control unit that can change the order of operations based on stored information. Peripheral devices allow information to be retrieved from an external source, and the result of operations saved and retrieved.
The first electronic digital computers were developed between 1940 and 1945 in the United Kingdom and United States. Originally they were the size of a large room, consuming as much power as several hundred modern personal computers (PCs). In this era mechanical analog computers were used for military applications.
Modern computers based on integrated circuits are millions to billions of times more capable than the early machines, and occupy a fraction of the space. Simple computers are small enough to fit into mobile devices, and mobile computers can be powered by small batteries. Personal computers in their various forms are icons of the Information Age and are what most people think of as "computers". However, the embedded computers found in many devices from mp3 players to fighter aircraft and from toys to industrial robots are the most numerous.
History of computing
The first use of the word "computer" was recorded in 1613, referring to a person who carried out calculations, or computations, and the word continued with the same meaning until the middle of the 20th century. From the end of the 19th century the word began to take on its more familiar meaning, a machine that carries out computations.
Conventionally, a computer consists of at least one processing element, typically a central processing unit (CPU) and some form of memory. The processing element carries out arithmetic and logic operations, and a sequencing and control unit that can change the order of operations based on stored information. Peripheral devices allow information to be retrieved from an external source, and the result of operations saved and retrieved.
The first electronic digital computers were developed between 1940 and 1945 in the United Kingdom and United States. Originally they were the size of a large room, consuming as much power as several hundred modern personal computers (PCs). In this era mechanical analog computers were used for military applications.
Modern computers based on integrated circuits are millions to billions of times more capable than the early machines, and occupy a fraction of the space. Simple computers are small enough to fit into mobile devices, and mobile computers can be powered by small batteries. Personal computers in their various forms are icons of the Information Age and are what most people think of as "computers". However, the embedded computers found in many devices from mp3 players to fighter aircraft and from toys to industrial robots are the most numerous.
History of computing
The first use of the word "computer" was recorded in 1613, referring to a person who carried out calculations, or computations, and the word continued with the same meaning until the middle of the 20th century. From the end of the 19th century the word began to take on its more familiar meaning, a machine that carries out computations.
Limited-function early computersThe history of the modern computer begins with two separate technologies, automated calculation and programmability, but no single device can be identified as the earliest computer, partly because of the inconsistent application of that term.
A few devices are worth mentioning though, like some mechanical aids to computing, which were very successful and survived for centuries until the advent of the electronic calculator, like the Sumerian abacus, designed around 2500 BC of which a descendant won a speed competition against a modern desk calculating machine in Japan in 1946, the slide rules, invented in the 1620s, which were carried on five Apollo space missions, including to the moon and arguably the astrolabe and the Antikythera mechanism, an ancient astronomical computer built by the Greeks around 80 BC.
The Greek mathematician Hero of Alexandria (c. 10–70 AD) built a mechanical theater which performed a play lasting 10 minutes and was operated by a complex system of ropes and drums that might be considered to be a means of deciding which parts of the mechanism performed which actions and when.This is the essence of programmability.
Around the end of the 10th century, the French monk Gerbert d'Aurillac brought back from Spain the drawings of a machine invented by the Moors that answered either Yes or No to the questions it was asked.Again in the 13th century, the monks Albertus Magnus and Roger Bacon built talking androids without any further development (Albertus Magnus complained that he had wasted forty years of his life when Thomas Aquinas, terrified by his machine, destroyed it).
In 1642, the Renaissance saw the invention of the mechanical calculator, a device that could perform all four arithmetic operations without relying on human intelligence. The mechanical calculator was at the root of the development of computers in two separate ways. Initially, it was in trying to develop more powerful and more flexible calculators that the computer was first theorized by Charles Babbage and then developed. Secondly, development of a low-cost electronic calculator, successor to the mechanical calculator, resulted in the development by Intel of the first commercially available microprocessor integrated circuit.
A few devices are worth mentioning though, like some mechanical aids to computing, which were very successful and survived for centuries until the advent of the electronic calculator, like the Sumerian abacus, designed around 2500 BC of which a descendant won a speed competition against a modern desk calculating machine in Japan in 1946, the slide rules, invented in the 1620s, which were carried on five Apollo space missions, including to the moon and arguably the astrolabe and the Antikythera mechanism, an ancient astronomical computer built by the Greeks around 80 BC.
The Greek mathematician Hero of Alexandria (c. 10–70 AD) built a mechanical theater which performed a play lasting 10 minutes and was operated by a complex system of ropes and drums that might be considered to be a means of deciding which parts of the mechanism performed which actions and when.This is the essence of programmability.
Around the end of the 10th century, the French monk Gerbert d'Aurillac brought back from Spain the drawings of a machine invented by the Moors that answered either Yes or No to the questions it was asked.Again in the 13th century, the monks Albertus Magnus and Roger Bacon built talking androids without any further development (Albertus Magnus complained that he had wasted forty years of his life when Thomas Aquinas, terrified by his machine, destroyed it).
In 1642, the Renaissance saw the invention of the mechanical calculator, a device that could perform all four arithmetic operations without relying on human intelligence. The mechanical calculator was at the root of the development of computers in two separate ways. Initially, it was in trying to develop more powerful and more flexible calculators that the computer was first theorized by Charles Babbage and then developed. Secondly, development of a low-cost electronic calculator, successor to the mechanical calculator, resulted in the development by Intel of the first commercially available microprocessor integrated circuit.
First general-purpose computers
In 1801, Joseph Marie Jacquard made an improvement to the textile loom by introducing a series of punched paper cards as a template which allowed his loom to weave intricate patterns automatically. The resulting Jacquard loom was an important step in the development of computers because the use of punched cards to define woven patterns can be viewed as an early, albeit limited, form of programmability.
It was the fusion of automatic calculation with programmability that produced the first recognizable computers. In 1837, Charles Babbage was the first to conceptualize and design a fully programmable mechanical computer, his analytical engine.
Limited finances and Babbage's inability to resist tinkering with the design meant that the device was never completed—nevertheless his son, Henry Babbage, completed a simplified version of the analytical engine's computing unit (the mill) in 1888. He gave a successful demonstration of its use in computing tables in 1906. This machine was given to the Science museum in South Kensington in 1910.
In the late 1880s, Herman Hollerith invented the recording of data on a machine-readable medium. Earlier uses of machine-readable media had been for control, not data. "After some initial trials with paper tape, he settled on punched cards ..." To process these punched cards he invented the tabulator, and the keypunch machines.
These three inventions were the foundation of the modern information processing industry. Large-scale automated data processing of punched cards was performed for the 1890 United States Census by Hollerith's company, which later became the core of IBM. By the end of the 19th century a number of ideas and technologies, that would later prove useful in the realization of practical computers, had begun to appear: Boolean algebra, the vacuum tube (thermionic valve), punched cards and tape, and the teleprinter.
During the first half of the 20th century, many scientific computing needs were met by increasingly sophisticated analog computers, which used a direct mechanical or electrical model of the problem as a basis for computation. However, these were not programmable and generally lacked the versatility and accuracy of modern digital computers.
Alan Turing is widely regarded as the father of modern computer science. In 1936 Turing provided an influential formalisation of the concept of the algorithm and computation with the Turing machine, providing a blueprint for the electronic digital computer. Of his role in the creation of the modern computer, Time magazine in naming Turing one of the 100 most influential people of the 20th century, states: "The fact remains that everyone who taps at a keyboard, opening a spreadsheet or a word-processing program, is working on an incarnation of a Turing machine".
The Atanasoff–Berry Computer (ABC) was the world's first electronic digital computer, albeit not programmable. Atanasoff is considered to be one of the fathers of the computer.Conceived in 1937 by Iowa State College physics professor John Atanasoff, and built with the assistance of graduate student Clifford Berry, the machine was not programmable, being designed only to solve systems of linear equations. The computer did employ parallel computation. A 1973 court ruling in a patent dispute found that the patent for the 1946 ENIAC computer derived from the Atanasoff–Berry Computer.
The first program-controlled computer was invented by Konrad Zuse, who built the Z3, an electromechanical computing machine, in 1941.The first programmable electronic computer was the Colossus, built in 1943 by Tommy Flowers.
George Stibitz is internationally recognized as a father of the modern digital computer. While working at Bell Labs in November 1937, Stibitz invented and built a relay-based calculator he dubbed the "Model K" (for "kitchen table", on which he had assembled it), which was the first to use binary circuits to perform an arithmetic operation.
Later models added greater sophistication including complex arithmetic and programmability. A succession of steadily more powerful and flexible computing devices were constructed in the 1930s and 1940s, gradually adding the key features that are seen in modern computers. The use of digital electronics (largely invented by Claude Shannon in 1937) and more flexible programmability were vitally important steps, but defining one point along this road as "the first digital electronic computer" is difficult.Shannon 1940 Notable achievements include:
In 1801, Joseph Marie Jacquard made an improvement to the textile loom by introducing a series of punched paper cards as a template which allowed his loom to weave intricate patterns automatically. The resulting Jacquard loom was an important step in the development of computers because the use of punched cards to define woven patterns can be viewed as an early, albeit limited, form of programmability.
It was the fusion of automatic calculation with programmability that produced the first recognizable computers. In 1837, Charles Babbage was the first to conceptualize and design a fully programmable mechanical computer, his analytical engine.
Limited finances and Babbage's inability to resist tinkering with the design meant that the device was never completed—nevertheless his son, Henry Babbage, completed a simplified version of the analytical engine's computing unit (the mill) in 1888. He gave a successful demonstration of its use in computing tables in 1906. This machine was given to the Science museum in South Kensington in 1910.
In the late 1880s, Herman Hollerith invented the recording of data on a machine-readable medium. Earlier uses of machine-readable media had been for control, not data. "After some initial trials with paper tape, he settled on punched cards ..." To process these punched cards he invented the tabulator, and the keypunch machines.
These three inventions were the foundation of the modern information processing industry. Large-scale automated data processing of punched cards was performed for the 1890 United States Census by Hollerith's company, which later became the core of IBM. By the end of the 19th century a number of ideas and technologies, that would later prove useful in the realization of practical computers, had begun to appear: Boolean algebra, the vacuum tube (thermionic valve), punched cards and tape, and the teleprinter.
During the first half of the 20th century, many scientific computing needs were met by increasingly sophisticated analog computers, which used a direct mechanical or electrical model of the problem as a basis for computation. However, these were not programmable and generally lacked the versatility and accuracy of modern digital computers.
Alan Turing is widely regarded as the father of modern computer science. In 1936 Turing provided an influential formalisation of the concept of the algorithm and computation with the Turing machine, providing a blueprint for the electronic digital computer. Of his role in the creation of the modern computer, Time magazine in naming Turing one of the 100 most influential people of the 20th century, states: "The fact remains that everyone who taps at a keyboard, opening a spreadsheet or a word-processing program, is working on an incarnation of a Turing machine".
The Atanasoff–Berry Computer (ABC) was the world's first electronic digital computer, albeit not programmable. Atanasoff is considered to be one of the fathers of the computer.Conceived in 1937 by Iowa State College physics professor John Atanasoff, and built with the assistance of graduate student Clifford Berry, the machine was not programmable, being designed only to solve systems of linear equations. The computer did employ parallel computation. A 1973 court ruling in a patent dispute found that the patent for the 1946 ENIAC computer derived from the Atanasoff–Berry Computer.
The first program-controlled computer was invented by Konrad Zuse, who built the Z3, an electromechanical computing machine, in 1941.The first programmable electronic computer was the Colossus, built in 1943 by Tommy Flowers.
George Stibitz is internationally recognized as a father of the modern digital computer. While working at Bell Labs in November 1937, Stibitz invented and built a relay-based calculator he dubbed the "Model K" (for "kitchen table", on which he had assembled it), which was the first to use binary circuits to perform an arithmetic operation.
Later models added greater sophistication including complex arithmetic and programmability. A succession of steadily more powerful and flexible computing devices were constructed in the 1930s and 1940s, gradually adding the key features that are seen in modern computers. The use of digital electronics (largely invented by Claude Shannon in 1937) and more flexible programmability were vitally important steps, but defining one point along this road as "the first digital electronic computer" is difficult.Shannon 1940 Notable achievements include:
Konrad Zuse's electromechanical "Z machines". The Z3 (1941) was the first working machine featuring binary arithmetic, including floating point arithmetic and a measure of programmability. In 1998 the Z3 was proved to be Turing complete, therefore being the world's first operational computer.
The non-programmable Atanasoff–Berry Computer (commenced in 1937, completed in 1941) which used vacuum tube based computation, binary numbers, and regenerative capacitor memory. The use of regenerative memory allowed it to be much more compact than its peers (being approximately the size of a large desk or workbench), since intermediate results could be stored and then fed back into the same set of computation elements.
The non-programmable Atanasoff–Berry Computer (commenced in 1937, completed in 1941) which used vacuum tube based computation, binary numbers, and regenerative capacitor memory. The use of regenerative memory allowed it to be much more compact than its peers (being approximately the size of a large desk or workbench), since intermediate results could be stored and then fed back into the same set of computation elements.
The secret British Colossus computers (1943), which had limited programmability but demonstrated that a device using thousands of tubes could be reasonably reliable and electronically reprogrammable. It was used for breaking German wartime codes. The Harvard Mark I (1944), a large-scale electromechanical computer with limited programmability.
The U.S. Army's Ballistic Research Laboratory ENIAC (1946), which used decimal arithmetic and is sometimes called the first general purpose electronic computer (since Konrad Zuse's Z3 of 1941 used electromagnets instead of electronics). Initially, however, ENIAC had an inflexible architecture which essentially required rewiring to change its programming.
Source: Wikipedia
2013, By: Seo MasterThe U.S. Army's Ballistic Research Laboratory ENIAC (1946), which used decimal arithmetic and is sometimes called the first general purpose electronic computer (since Konrad Zuse's Z3 of 1941 used electromagnets instead of electronics). Initially, however, ENIAC had an inflexible architecture which essentially required rewiring to change its programming.
Source: Wikipedia
Seo Master present to you:
Even computer manufacturers like Apple offer gift cards to customers who send in an old iPhone, iPad, or computer for reuse or recycling if those devices still have monetary value.
Whatever other resolutions we make leading up to the New Year -- to call Mom more often, lay off the late-night snacks -- getting ourselves organized is likely near the top of the list. And that often means clearing out the clutter that keeps us from functioning efficiently, whether we're at work or at home.
Many employees -- whether they go to actual offices or do their jobs from home -- find the last week of the calendar year is ideal for sorting through e-mails, clearing their desks, and reorganizing their work spaces. Sorting through stuff is rarely fun, but those who tackle it now will find themselves a step ahead when their now-vacationing colleagues and clients come staggering back after the holidays.
According to the National Association of Professional Organizers, which sponsors the annual "Get Organized Month" each January to help folks take control of their time, tasks and possessions, 83% of members polled say that "paper organization" ranks highest on their individual and corporate clients' to-do lists. For people taking time off between Christmas and New Year's, this week offers a chance to get things in order before 2013 arrives.
Devoting time to both physically and mentally clearing out the "old" and embracing the "new" is about more than just getting rid of stuff. Being organized is really about being in control, says Susan Fleischman, a Chicago-based professional organizer, home stager and founder of clutterfree.
"As joyous as the holidays can be, the period between Thanksgiving and New Year's is probably one of the most stressful of the year for people," she says. That's why spending the week after Christmas decluttering "really helps you recover and detox from the hustle and bustle of the holidays.
"It's very symbolic -- we're ramping up to the ultimate do-over. We all get to turn the calendar page and make a fresh start."
For those at work, says Fleischman, "the phone stops ringing, there are fewer meetings. Real work probably comes to a screeching halt. There are far fewer reasons to keep letting getting organized fall to the bottom of the to-do list." And these days, when employees often feel compelled to work harder and longer, being organized can be a real competitive advantage.
NAPO Industry Member Director Mary Dykstra says that on average, Americans waste time amounting to between six and 12 weeks a year searching for things in their offices and homes. "Just imagine if you could get out from under that clutter and spend that time helping your company build their business and ultimately, your career," says Fleischman, who was a public relations and marketing executive before launching her professional organizing business.
"Every minute counts when it comes to impressing the boss, your colleagues and clients. At work, we strive to project that we're knowledgeable, in control and experts. We're constantly accessing, sharing, reacting to information. Being able to put your hands on the information or generate some information means the better you'll be able to rise to the top and have clarity of thought and creativity, and maximize productivity."
But what about moving from work to the home front? Cynthia Ewer, the Washington state-based editor of OrganizedHome.com and the author of "The Complete Idiot's Guide to Getting Organized Fast-Track," suggests we use this in-between-holidays week to step back and reflect on our habits and how well they're working for us at home.
It's important to remember, says Ewer, that "there are different personality types. "Organized" is what works for you. There are filers -- people who love folders. They want the serenity of knowing where things are. Pilers like to keep their eyes on their stuff. Deniers have bags of paperwork shoved into closets. Instead of using a "What-does-it-look-like?" yardstick, it's a "How-will-it-work?" question. Know yourself, and come up with solutions that reflect who you are, she says.
After all, she says, " 'It's here somewhere' is the most frustrating phrase in the English language."
Cutting clutter also can boost the bottom line. "How many times do you go to the store and buy the things you couldn't find?" asks Fleischman. But cleaning up and cleaning out also can generate money, says Ewer.
"It can be a real fun process to turn your clutter into cash."
Nab tax deductions by donating cleared-out items to nonprofit organizations. Declutterers can send usable books, DVDs, video games, and music to third-party merchants in exchange for gift cards through the Amazon Trade-In Program.
Even computer manufacturers like Apple offer gift cards to customers who send in an old iPhone, iPad, or computer for reuse or recycling if those devices still have monetary value.
"Leading an orderly life is about saving time, saving money, reducing stress," says Fleischman, who also blogs about organizing tips and clutter makeovers. "And that's energy you can spend on leisure pursuits, which is very important to emotional well-being."
Some tips for cutting through the workplace and home clutter this holiday week:
• Stockpile your supplies. Fleischman advises making sure you've got the right trash bins, shredders, file folders and markers at your fingertips before you start sorting and tossing.
• Take it a zone at a time. Your office, home and car didn't become a mess overnight, so declutter in increments. Fleischman suggests starting with desktops, then floors, then moving on to file cabinets and bookcases.
• Go from horizontal to vertical piles. If you're purging papers, clear those piles from your desk and the floor by placing newly sorted files in a cabinet or an upright vertical file. This way, your eyes can quickly scan and identify what you need at a glance.
• Free up the fridge. "Get the ghosts of Christmas past out of there -- all those little cans of this and that, the beef sticks from the gift basket no one can bear to throw out," says Ewer. Besides, this clean-up also will save you some calories.
• Be realistic. If you really write out bills at the kitchen table and not in the home office, says Ewer, get yourself a wheeled cart you can roll where the work gets done. If your kids' toys actually live in the family room -- not in the bedroom toy box -- create a storage solution there.
"Look at your patterns of living and organize yourself accordingly."
STORY HIGHLIGHTS
* Do your New Year's resolutions include a push to clean up? Here are some tips to start
* Being organized is about being in control, says professional organizer Susan Fleischman
* Cleaning clutter can eliminate the need to buy what you simply can't find
-By Maureen Jenkins, Special to CNN
2013, By: Seo MasterSeo Master present to you:
Nayabad Mosque, Dinajpur
Nayabad Mosque is situated on the bank of the Dhepa river in village Nayabad in Ramchandrapur Union under Kaharol Thana of Dinajpur district, about 20 km to the north-west of the district town. The mosque, built on about 1.15 bighas of land, has been renovated by the Department of Archaeology, Bangladesh. A madrasa has recently been built in front of the mosque.
An inscription on the central doorway records the date of its construction as 2 Jyaistha, 1200 BS (1793 AD) in the reign of Emperor shah alam II. According to local traditions, the mosque was built by Muslim architectural workers who had come to this place from the west to build Kantanagar Temple sometime in mid-18th century. They had settled in Nayabad, a village near the temple, and had built the mosque for their own use.
Nayabad Mosque, Dinajpur
It is an oblong three-domed mosque with octagonal towers at the four corners and measures 12.45m ´ 5.5m externally. The walls are 1.10m thick. Of the three arched entrances the central one is bigger than the flanking ones. These are equal in height and width. The central arch is 1.95m high and 1.15m wide. There is an arched window each on the south and north sides. Multi-cusped arches have been used in the doorways and windows. There are three mihrabs inside in the western wall in line with the three entrances. The central mihrab (2,30m high and 1.08m wide) is bigger than the flanking ones which are of equal size. Three hemispherical domes cover the mosque, of which the central one is bigger than the side ones. Pendentives have been used in their phase of transition. The parapet and cornice are straight.
Of the four corner towers in the four outer corners of the mosque two (northeastern and northwestern) still possess the cupolas on their top. The top of the other two is now bare. The corner towers are plastered and gradually tapering; each had a lantern-like chhatri on the top crowned with a cupola. Four bands at regular intervals decorate the surface of each tower.
The terracotta plaques used in the decoration of the mosque have become loose and most of them have been damaged. At present there are about 104 terracotta plaques (rectangular in shape, 0.40m ´ 0.30m) used in the surface decoration of the mosque walls. Though damaged some of them show floral and creeper motifs. It is noteworthy that one contains a depiction of a pair of peacocks.
2013, By: Seo Master