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28.12.2015


Once you know you're getting an iPhone and now, you need to decide which iPhone you want to get. The up front difference between $0 and $399 is huge, especially if you have rent to pay or a family to feed. Alternatively, the iPhone 5c and especially the monstrously powerful iPhone 5s likely have many years of useful life ahead of them, well beyond the life of a contract. The iPhone 4s has a decent camera and comes loaded with Siri, Apple's personal digital assistant.
If you want a great iPhone at a slightly better price, and the new palette and feel holds a lot of appeal to you, save a few bucks, have some more fun, and get the iPhone 5c. If you're an early adopter, if you appreciate premium products, if photography is important to you, if you want the best of the best, get the iPhone 5s. Apple has announced that all new Apple Watch apps submitted after June 1 will have to be native apps built on watchOS 2. En poursuivant votre navigation sur ce site, vous acceptez l’utilisation de cookies pour vous proposer des contenus et services adaptes a vos centres d’interets. Les seuls chiffres disponibles au niveau mondial sont ceux de l'US EIA (US Energy Information Administration), qui produit beaucoup de statistiques sur l'energie, mais ils suscitent la polemique. Le 10 juin, l'agence a livre sa derniere etude, qui passe en revue 137 gisements dans 41 pays : au total, elle evalue a 345 milliards de barils la quantite de petrole de schiste techniquement extractible, soit dix fois plus que son estimation de 2011.
A l'inverse, le rapport revoit nettement a la baisse ses estimations des reserves potentielles de gaz de schiste pour la France, a 3 900 milliards de m3 contre 5 100 milliards en 2011 (- 23 %).
Pour estimer leurs reserves, l'EIA s'est alors basee sur une compilation d'etudes – six dans le cas francais, dont trois provenant de l'IFPEN.
Trois donnees geologiques sont necessaires pour evaluer les volumes d'hydrocarbures techniquement recuperables : la superficie du bassin sedimentaire, son epaisseur et les caracteristiques biologiques et physiques des roches-meres – les roches ultra compactes dans lesquelles sont disperses les huiles et gaz de shiste. Au final, seuls l'exploration et des tests de production permettent de determiner a la fois la productivite de chaque puits – sa quantite en hydrocarbures – et le taux de recuperation, qui mesure la partie du gisement techniquement extractible. Preuve de la difficulte de l'exercice, la Pologne, dopee par des premieres estimations mirobolantes de l'EIA (qui parlait en 2011 de gisements de 5 300 milliards de m3), a dechante apres une trentaine de forages exploratoires effectues sur trois sites. Meme aux Etats-Unis, le seul pays qui exploite a large echelle les gaz et huiles de schiste, la productivite des puits et le taux de recuperation font encore debat. G+ #Read of the Day: The Daguerreotype - The daguerreotype, an early form of photograph, was invented by Louis Daguerre in the early 19th c. The first photograph (1826) - Joseph Niepce, a French inventor and pioneer in photography, is generally credited with producing the first photograph.
Easy Peasy Fact:Following Niepcea€™s experiments, in 1829 Louis Daguerre stepped up to make some improvements on a novel idea. Adafruit: The oldest street scene photos of New York City - Check out these incredible (and incredibly old) photos of NYC, via Ephemeral New York. The oldest street scene photos of New York CityCheck out these incredible (and incredibly old) photos of NYC, via Ephemeral New York. I still remember reading about Louis Daguerre's invention, the daguerreotype, in high school.
The Making of the American Museum of Natural Historya€™s Wildlife DioramasFossil shark-jaw restoration, 1909. Very old portrait of three men identified as (from left to right) Henry, George, and Stephen Childs, November 25, 1842.
In 1840, Hippolyte Bayard, a pioneer of early photography, created an image called Self-Portrait as a Drowned Man. 10 Times History Was Captured in Living ColorColor photographs go back to before you might think.
Louis Daguerrea€™s view of the Boulevard du Temple in the French capital was captured in 1938, using a method a€“ the daguerreotype a€“ that took around seven minutes to develop a single image.Such a long exposure meant that anything moving around was not picked up.
Over the course of two years, when you add the price of the voice plan, data plan, and extras like voicemail, messaging, etc. The total cost difference between $2000 and $2399 isn't nearly as big, relatively speaking, so if you have the extra money to spend, the value of the higher end option can outweigh the cost.
The 2010 iPhone 4 - currently only available in China - is getting the 2013 iOS 7, after all. It's slightly less expensive, and is aimed at people for whom price is slightly more important.
A major reason for sluggish sales is due to the cost of the handset, which is higher than the price of a 16GB iPhone 6. Department of Justice has elected to drop its efforts to secure Apple's assistance in unlocking an iPhone at the center of a New York drug case. Les estimations divergentes se multiplient dans de nombreux pays qui aspirent a exploiter ces hydrocarbures non conventionnels, nouvelle donne energetique planetaire. Les reserves de gaz de schiste sont, elles, reevaluees de 10 % pour atteindre 207 000 milliards de m3. Le bassin du Sud-Est, en particulier, renfermerait dix fois moins de ressources que celles evaluees il y a deux ans.


En moyenne, l'EIA estime ce dernier entre 20 et 30 %, en se basant sur les caracteristiques des roches americaines.
Les reserves ont ete revues a la baisse en mars 2012, divisees par dix par l'Institut national de geologie, et le geant ExxonMobil s'est retire du pays. Dans son rapport Golden Rules for a Golden Age of Gas, l'Agence internationale de l'energie propose ainsi deux scenarios futurs, un haut qui voit la production de gaz de schiste grimper jusqu'en 2035, et un bas, qui prevoit une production qui croit jusqu'en 2017 avant de revenir aux niveaux de 2010. Talbot was active from the mid-1830s, and sits alongside Louis Daguerre as one of the fathers of the medium. Niepcea€™s photograph shows a view from the Window at Le Gras, and it only took eight hours of exposure time!The history of photography has roots in remote antiquity with the discovery of the principle of the camera obscura and the observation that some substances are visibly altered by exposure to light. Again employing the use of solvents and metal plates as a canvas, Daguerre utilized a combination of silver and iodine to make a surface more sensitive to light, thereby taking less time to develop. Half of the Limburg province of Belgium is added to the Netherlands, giving rise to a Belgian Limburg and Dutch Limburg (the latter being from September 5 joined to the German Confederation).June 3 a€“ Destruction of opium at Humen begins, casus belli for Britain to open the 3-year First Opium War against Qing dynasty China. Bayard had just perfected the process of printing on to paper, which would come to define photography in the following century, but the French government had decided to invest instead in the daguerrotype, a process invented by his rival, Louis Daguerre.
The only figure to stay still long enough was a man, on the corner of the street, who had stopped to have his shoes shined.Created using a chemically-treated silver plate, it only shows anyone at all because the man stopped long enough to make history.
If you're on-contract, you'll be paying a couple thousand dollars over the next couple of years anyway, so a few hundred for up-front may not matter to you. La Chine serait le pays le plus riche au monde en gaz de schiste (31 500 milliards de m3) et le troisieme pour le petrole de schiste (32 milliards de barils). Ces donnees sont entachees de beaucoup d'incertitudes, juge Francois Kalaydjian, directeur adjoint du centre ressources de l'Institut francais du petrole Energies nouvelles (IFPEN). Mais pour l'IFPEN, il pourrait etre inferieur a 10 % dans le Bassin parisien, ou meme nul par endroits. Avec d'autres facteurs qui interviennent, tels que le cout de l'extraction et l'opposition d'une partie de l'opinion, rien ne garantit que l'Oncle Sam tirera toujours autant profit de son sous-sol.
As far as is known, nobody thought of bringing these two phenomena together to capture camera images in permanent form until around 1800, when Thomas Wedgwood made the first reliably documented although unsuccessful attempt. It didna€™t take long for others to seize the new technology and create daguerreotypes of New York City street scenes. Daguerreotypes are sharply defined, highly reflective, one-of-a-kind photographs on silver-coated copper plates, usually packaged behind glass and kept in protective cases. However, if you don't have that couple extra thousand up front, especially if you're going off-contract, up-front cost really will matter. It's got colorful shells made of durable plastic, and otherwise all the great tech and still good specs of last year's flagship. With it you get truly next-generation technology like the Touch ID fingerprint scanner, the much-improved camera, and the amazing Apple A7 chipset. Les Etats-Unis, eux, se placeraient au quatrieme rang pour le gaz et au deuxieme pour le petrole. Tout comme le ministre du redressement productif Arnaud Montebourg qui a explique, mardi 9 juillet, etre en faveur de la creation d'une entreprise nationale publique pour exploiter cette supposee manne energetique francaise. La seule facon de reellement savoir ce que renferme notre sous-sol, c'est de proceder a des forages exploratoires." Or, depuis la loi Jacob du 13 juillet 2011, la fracturation hydraulique, seule technique aujourd'hui disponible pour l'exploration et l'exploitation du gaz et du petrole de schiste, est interdite en France, en raison de risques pour l'environnement juges trop eleves.
Mais pour rechercher des huiles et du gaz de schiste, il faut aller plus loin", poursuit l'expert. A daguerreotype, produced on a silver-plated copper sheet, produces a mirror image photograph of the exposed scene. The Government, which has been only too generous to Monsieur Daguerre, has said it can do nothing for Monsieur Bayard, and the poor wretch has drowned himself. It will cost you more up-front, but it will last you longer, and it will give you access to the future sooner. L'Argentine, la Russie, l'Algerie, le Canada et le Mexique figurent egalement en tete de liste. Chemistry student Robert Cornelius was so fascinated by the chemical process involved in Daguerrea€™s work that he sought to make some improvements himself. It was commercially introduced in 1839, a date generally accepted as the birth year of practical photography.The metal-based daguerreotype process soon had some competition from the paper-based calotype negative and salt print processes invented by Henry Fox Talbot.
And in 1839 Cornelius shot a self-portrait daguerrotype that some historians believe was the first modern photograph of a man ever produced. For over two weeks in the summer of 2002, scientists and conservators at this prestigious facility subjected the artifact, its frame, and support materials to extensive and rigorous non-destructive testing. The result was a very complete scientific and technical analysis of the object, which in turn provided better criteria for its secure and permanent case design and presentation in the lobby of the newly-renovated Harry Ransom Center.The plate also received extensive attention from the photographic technicians at the Institute, who spent a day and a half with the original heliograph in their photographic studios in order to record photographically and digitally all aspects of the plate. The object was documented under all manner of scientific lights, including infrared and ultraviolet spectra. Long before the first photographs were made, Chinese philosopher Mo Ti and Greek mathematicians Aristotle and Euclid described a pinhole camera in the 5th and 4th centuries BCE. In the 6th century CE, Byzantine mathematician Anthemius of Tralles used a type of camera obscura in his experimentsIbn al-Haytham (Alhazen) (965 in Basra a€“ c.


Wilhelm Homberg described how light darkened some chemicals (photochemical effect) in 1694. The novel Giphantie (by the French Tiphaigne de la Roche, 1729a€“74) described what could be interpreted as photography.Around the year 1800, Thomas Wedgwood made the first known attempt to capture the image in a camera obscura by means of a light-sensitive substance.
As with the bitumen process, the result appeared as a positive when it was suitably lit and viewed.
A strong hot solution of common salt served to stabilize or fix the image by removing the remaining silver iodide.
On 7 January 1839, this first complete practical photographic process was announced at a meeting of the French Academy of Sciences, and the news quickly spread. At first, all details of the process were withheld and specimens were shown only at Daguerre's studio, under his close supervision, to Academy members and other distinguished guests. Paper with a coating of silver iodide was exposed in the camera and developed into a translucent negative image. Unlike a daguerreotype, which could only be copied by rephotographing it with a camera, a calotype negative could be used to make a large number of positive prints by simple contact printing. The calotype had yet another distinction compared to other early photographic processes, in that the finished product lacked fine clarity due to its translucent paper negative. This was seen as a positive attribute for portraits because it softened the appearance of the human face. Talbot patented this process,[20] which greatly limited its adoption, and spent many years pressing lawsuits against alleged infringers.
He attempted to enforce a very broad interpretation of his patent, earning himself the ill will of photographers who were using the related glass-based processes later introduced by other inventors, but he was eventually defeated. Nonetheless, Talbot's developed-out silver halide negative process is the basic technology used by chemical film cameras today. Hippolyte Bayard had also developed a method of photography but delayed announcing it, and so was not recognized as its inventor.In 1839, John Herschel made the first glass negative, but his process was difficult to reproduce. The new formula was sold by the Platinotype Company in London as Sulpho-Pyrogallol Developer.Nineteenth-century experimentation with photographic processes frequently became proprietary.
This adaptation influenced the design of cameras for decades and is still found in use today in some professional cameras.
Petersburg, Russia studio Levitsky would first propose the idea to artificially light subjects in a studio setting using electric lighting along with daylight. In 1884 George Eastman, of Rochester, New York, developed dry gel on paper, or film, to replace the photographic plate so that a photographer no longer needed to carry boxes of plates and toxic chemicals around. Now anyone could take a photograph and leave the complex parts of the process to others, and photography became available for the mass-market in 1901 with the introduction of the Kodak Brownie.A practical means of color photography was sought from the very beginning.
Results were demonstrated by Edmond Becquerel as early as 1848, but exposures lasting for hours or days were required and the captured colors were so light-sensitive they would only bear very brief inspection in dim light.The first durable color photograph was a set of three black-and-white photographs taken through red, green and blue color filters and shown superimposed by using three projectors with similar filters. It was taken by Thomas Sutton in 1861 for use in a lecture by the Scottish physicist James Clerk Maxwell, who had proposed the method in 1855.[27] The photographic emulsions then in use were insensitive to most of the spectrum, so the result was very imperfect and the demonstration was soon forgotten. Maxwell's method is now most widely known through the early 20th century work of Sergei Prokudin-Gorskii. Included were methods for viewing a set of three color-filtered black-and-white photographs in color without having to project them, and for using them to make full-color prints on paper.[28]The first widely used method of color photography was the Autochrome plate, commercially introduced in 1907.
If the individual filter elements were small enough, the three primary colors would blend together in the eye and produce the same additive color synthesis as the filtered projection of three separate photographs. Autochrome plates had an integral mosaic filter layer composed of millions of dyed potato starch grains.
Reversal processing was used to develop each plate into a transparent positive that could be viewed directly or projected with an ordinary projector. The mosaic filter layer absorbed about 90 percent of the light passing through, so a long exposure was required and a bright projection or viewing light was desirable. Competing screen plate products soon appeared and film-based versions were eventually made. A complex processing operation produced complementary cyan, magenta and yellow dye images in those layers, resulting in a subtractive color image. Kirsch at the National Institute of Standards and Technology developed a binary digital version of an existing technology, the wirephoto drum scanner, so that alphanumeric characters, diagrams, photographs and other graphics could be transferred into digital computer memory. The lab was working on the Picturephone and on the development of semiconductor bubble memory. The essence of the design was the ability to transfer charge along the surface of a semiconductor. Michael Tompsett from Bell Labs however, who discovered that the CCD could be used as an imaging sensor.



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