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vendredi 31 mars 2017
Dowload Turbo Pascal free
Dowload Turbo Pascal free
Introduction au langage Pascal:
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Pascal est un langage de programmation multi-usage basé sur les commandes. Il est connu par sa clarté et sa force de créer facilement des programmes. Ce qui rend Pascal, le langage de programmation le plus utilisé dans l'enseignement jusqu'à récemment. Outre la facilité et la puissance, Pascal est caractérisé par plusieurs dénominateurs communs avec le langage C. Mais Pascal a été conçu initialement pour des raisons pédagogiques purement, et a été limité; (par exemple il n'y avait aucune présence de chaînes).
Plus de tout cela, tous les copies utilisées pour Pascal en dehors du monde éducatif sont des versions modifiées telles que Turbo Pascal, Delphi, Pascal Objet.
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jeudi 9 mars 2017
From CRT to Ultra HD
breakthroughs in TV technology which have changed the way we watch
From HD to 3D via Plasma and LED, discover 10 key innovations in television technology from the last few decades.
Britain is a nation of telly addicts. And why not? TV’s a great way to relax, catch up on world events and keep us entertained.
According to Ofcom, 90% of us watch TV each week, and one in four adults say a television is the device they would miss the most.
Over the last 10 years the TV industry has change dramatically. Technological developments have ushered in a multi-channel era, with better picture quality and more choice about what we watch and when we watch it.
Here are 10 breakthroughs in modern TV technology.
1. CRT
If you bought a television between the late 1960s and the 2000s it was probably a cathode ray tube (CRT) set.
Each CRT set has a vacuum tube with electron guns that beam red, green and blue electrons onto a phosphor screen. The rays scan the dark screen, building up thousands of red green or blue dots to create picture.
The technology dominated for three quarters of a century - CRT TVs date back to the 1930s and it was only in 2007 that sales of the slimmer, more versatile LCD units overtook sales of CRT sets.
2. LCD vs Plasma
Flat screen sets started to appear in the late 1990s. Their immediate advantage over CRT was space. They were also lighter, so could be mounted on a wall and came in bigger screen sizes.
But the choice between CRT and flat screen wasn’t straightforward - in the early 2000s you had the choice of two flat-panel technologies: LCD or Plasma.
LCD panels have a backlight made from CCFL lamps, which shine through a polarising filter and a matrix of colour liquid coloured crystal cells. Each cell lets in a different amount of colour creating a picture.
Plasma screens were comprised of thousands of cells between glass panels. Each of the cells (or pixels) holds a gas and when an electrical charge passes through a reaction occurs and red, green or blue light is emitted depending on the current.
Plasma sets had superior black levels, contrast, better viewing angles and high refresh rates (which means less blur with fast moving action). However they were less energy efficient than LCD, and as the price of LCD sets dropped they were eventually overtaken in popularity by LCD and LED technology. In 2014 Panasonic and other manufacturers discontinued plasma sets.
3. Digital television
By : Hannah Bouckley
From : http://home.bt.com
iPhone 8 could have a powerful augmented reality-capable graphics chip
iPhone 8 could have a powerful augmented reality-capable graphics chip
The company behind the iPhone 7's chip has something new
Graphics hardware and software firm Imagination Technologies has unveiled its newest graphics processing architecture which - given the company's previous work with Apple - may appear on future iPhones.
The newly announced PowerVR Furian offers improvements over Imagination's current-standing tech, with 35% greater GFLOPS density and 80% greater fillrate density.
This essentially translates to noticeably improved performance in day-to-day casual gaming and user interface experiences, but the Furian's capabilities don't stop there.
In addition to optimizing multiple graphics APIs, like OpenCL 2.0, OpenVX 1.1, and Vulkan, the chip tech also promises 70%-90% gaming density improvement - a boon to more demanding games on mobile devices.
This power is especially handy when aforementioned demanding games use augmented reality or virtual reality - two capabilities Imagination specifically had in mind when making the architecture for Furian.
Will it make it to iPhone 8?
Imagination's technologies have made repeat appearances in Apple's A-series chips, making it likely we'll see a modified PowerVR Furian GPU featured in upcoming iPhones.
In fact, a variant of Furian's predecessor, the PowerVR Rogue, was recently used in the Apple A10 chipset that powers the iPhone 7 and
iPhone 7 Plus.
iPhone 7 Plus.
While it would seem logical to conclude that the iPhone maker has eyes for Furian, Apple has also been showing signs of wanting to go make its own chips independently, even going so far as considering buying Imagination Technologies outright last year.
That said, Imagination says the first products utilizing its latest graphics tech will be unveiled "mid-2017," which could come just in time if Furian is expected to debut inside the iPhone 8 later this year.
