Archive for the ‘Scientific instruments’ Category

Great Observatories World

Tuesday, August 3rd, 2010

saltSince its commissioning Nov. 10, 2005, SALT (Southern Large Telescope) is the largest optical telescope in the southern hemisphere. Consisting of 91 hexagonal mirrors, with a diameter of 11 m, it can detect a candle on the Moon.

lasillaChile. It is on the plains of La Silla, Chile, 2450 m, the European Southern Observatory (ESO) has implemented 15 telescopes in 1976. That site was chosen in such isolation is not a coincidence: the dust pollution are the worst enemies of astronomers.

paranalParanal. Lost in the desert, the VLT (Very Large Telescopes), were built by ESO between 1998 and 2001. The four telescopes of 8 m in diameter were drilled on the site of Paranal, Chile in the Andes where the dry climate is favorable comments.

keck-subaruHawaii. At 4150 m elevation on Mauna Kea in Hawaii, 7 are installed in Subaru Telescope, left, with the largest mirror room in the world (8 m) and two twin Keck 1 and Keck 2. The sky is clear and dry climate is ideal.

cfhtHawaii. CFHT is one of the telescopes located in Hawaii. It was built in the late 70s, one of the best sites near the summit of Mauna Kea. His special camera can observe a large number of faint objects.

canariesCanary. The observatory is located in the Canary Islands, Mount Roque de los Muchachos at 2400 m altitude, houses the instruments belonging to different European countries with large telescope Spanish, the GTC (Gran Telescopio Canarias).

mmtArizona. MMT (Multiple Mirror Telescope) was established in 1979 in Arizona on Mount Hopkins, to 2600 m. In 1996, its mirrors have been replaced by a single piece of 6.5 m in diameter, hence the name Monolithic Mirror Telescope recent.

areciboPuerto Rico. I mplanté north of Puerto Rico, Arecibo is the world’s largest radio telescope. With its 305 m in diameter, issued in 1974, the first radio message sent by humanity to any other civilizations.

lbtMount Graham. Located at 3170 m altitude on Mount Graham in Arizona, the telescope consists of two identical mirrors of 8.4m diameter. Its light-collecting area is equivalent to that of a single telescope mirror 11.8 m in diameter.

picdumidiPyrenees. From its 2877 m, in the heart of the Pyrenees, the Observatoire du Pic du Midi is a leading figure of French astronomical research. For over a century, scientists studying the Sun, planets, stars and galaxies.

bureSt Martin d’Heres. On the Plateau de Bure (Hautes-Alpes), 2550 m, pushing antennas IRAM (Institute for Millimetre Radio Astronomy St Martin d’Heres). They capture the radiation emitted by the cold gas from which stars form.

sdssNew Mexico. The SDSS (Sloan Digital Sky Survey), New Mexico, should be used to provide a precise celestial atlas. His exceptional pe rformance enable it to produce a catalog of 100,000,000 stars and distant galaxies.

What’s new on your PC

Monday, May 3rd, 2010

sciences-imagesBlu-Ray, SSD, 64-bit … Already ready, these technologies will be deployed on all computers soon. Should we wait to be equipped?
USB 3

On the occasion of CES 2010, many manufacturers have announced products that are compatible with USB 3 Seagate and Western Digital. USB 3 promises to deliver data rates 4-5 times faster than USB 2.

USB is limited in its version 2 transfer rates of 480 Mbit / s theoretical. But the volume now kept on computer (several tens to hundreds of GB) are constantly increasing.

It was not until 2011 however that USB 3 is required. Indeed, Intel does not integrate it into its chipsets motherboard before that date. Note that USB 2 is not compatible with the USB 3 (but the USB 3 will be backward-compatible) will therefore change the motherboard or expansion cards of hope.

sciences-images1Is almost a certainty now. The ray Blu-ray store has expanded and now equal to the ray DVD movies. Even for software, Blu-ray makes sense because of the limitations of the DVD storage (9GB for double layer, cons 25-50 GB for Blu-ray).

However, some programs now operating on two or three DVDs. Similarly, storage media, the DVD is not enough to put his personal files. For all these reasons, and because the price of Blu-ray has fallen below 100 euros, this format will democratize on computers.

Is the price of drives is still high, between 150 and 300 euros.

sciences-images2LCD TVs and monitors are now set on the image format 1080p (1920 x 1080 pixels). This format extends the world of computers, and off the screen change that requires (often 23 or 24 inches at least), it requires the latest equipment.

As the video stream is more complex to treat, there should be a modern graphics card (at 80-120 euros). On the other hand, the HDMI connection allows the use of an LCD monitor as a TV. But to do so, you need a graphics card with this type of interface.

sciences-images3Although still a minority in the currently 64-bit architectures becoming common. What do we talk? Our current computer architectures are based on memory address encoded in 32 bits. But this technology limits the management of the RAM to 4 GB in quantity.

However, current applications increasingly approaching that limit. 64-bit systems are ready (Windows 7), but the step means leaving aside the old devices are only compatible with 32-bit systems.

The software drivers and hardware are different between 32 and 64 bit architectures. That is why manufacturers delay the moment of migration. But it is almost inevitable, and will intervene massively either Windows 7 or later on under his successor (in 2013).

sciences-images4In the short term, the SSD will not become and replace hard drives. However, the manufacturers are now considering as a complementary solution.

The price of the 32GB hard drive is between 100 and 150 euros now, thereby placing them on high-end configurations first. The DSS offers an access time much lower than conventional hard drives with flash memory.

On the other hand, they are considered more reliable. They could therefore be used to store data in the operating system to improve responsiveness in the first place. For if the 256GB SSD already exist, their price is too high (over 600 euros) for their widespread use.

sciences-images5DDR3 is just beginning to spread on midrange computers. His prices were lowered, but also its capabilities have improved.

There are now memories clocked at 2 GHz to 2.4 GHz, 800 MHz cons for DDR2. The timings, ie the availability of memory arrays are also much better. There are, for example at 2 GHz with 8-8-8-24 Corsair.

However, for 6 GB of DDR3 2 Ghz, it will cost you between 350 and 400 euros today. But to 4GB of DDR3 to 1.2 GHz, count around 120 euros. This is still twice as expensive as DDR2, but costs continue to decline.

sciences-images6More conventional but nonetheless inevitable, stop support for older operating systems will force users buying new hardware, or downloading new software, change their computer.

Indeed, from Windows XP to Windows 7, the hardware recommendations climb: the dedicated graphics card with 128 MB is required, 2 GB RAM is preferable, and a 1.6 GHz dual core processor at least is recommended.

Linux and Mac OS X are also involved, but to a lesser extent. Their GUIs are generally lighter and reagents.

sciences-images7This should be fairly insensitive at first, but it will probably win the field with future models.

Manufacturers of processors, namely Intel and AMD are currently working to combine processor and graphics card to improve the effectiveness of 3D calculations.

Today, graphics chipsets are integrated into the motherboard. By moving the 3D calculations on the processor, it could save time and efficiency. However, the rendering multiply with new interfaces (including Aero in Windows 7).

This development will not, at least initially, to spend dedicated graphics cards, much more efficient. But it will speed up some simple treatments.

City of the Future at Gwanggyo

Thursday, April 29th, 2010

sciences-images87The center of the new town of Gwanggyo South Korea will resolutely avant-garde. Composed of eight skyscrapers, he combines green space walks and all the amenities of a modern city. It must be completed in 2011.

sciences-images88Gwanggyo is located 35 km south of the Korean capital Seoul. The Dutch firm MVRDV has designed a series of buildings shaped hills. Interconnected, they form the new town.

sciences-images89The buildings, constructed on the plazas, will be surrounded by greenery. Each resident will have access to a terrace to enjoy the outdoor life. This is the concept of Gwanggyo: a green and airy, where residents move easily.

sciences-images90Each tower will have a atrium allowing light to pass and air to circulate. In height, and will include the homes while their lower floors, as here, will be reserved for public spaces with recreational activities, culture or shopping.

sciences-images91The new town will be surrounded by a lake and wooded hills. Many access will be available from the buildings and verdant terraces, thus reinforcing the idea of a city-oriented nature.

sciences-images92This city will include 200,000 sqm of flats, 48,000 m² of offices, 200,000 square meters reserved for recreation, culture and retail and 200,000 sq finally parking in the basement. Gwanggyo will accommodate 77,000 people.

sciences-images93Most new urban programs in Korea have been to saturate the valleys of new construction. The aim of Architects is here to build a city that respects the environment without compromising. Hence building height and concentrated.

sciences-images94Walks and plazas will connect the towers and several buildings. On their roofs and their walls, skyscrapers will own boxwood hedges to give the city the appearance of green hills.

sciences-images95Conceived in 2007, the firm MVRDV’s project for the new town of Gwangyyo was declared winner of the international competition in late 2008. Its completion and the first accommodation must take place in 2011.

sciences-images96In designing this city, the architects have applied the principle of high urban density. On the same space together with the maximum building uses and complementary functions. The residential towers will be higher, the smallest being for recreation, shops and offices.

The 10 largest renewable energy projects in the world

Wednesday, April 28th, 2010

sciences-images65Since 2006, the Horse Hollow wind farm in Texas (United States) is the largest in the world. Located 160 km west of Dallas, it covers over 19,000 hectares. 421 turbines with a capacity of 775 megawatts issue, across all the United States, 525 gigawatt hours of electricity per year .

By 2012, another American wind farm in Oregon, should have 303 turbines with a capacity of 800 megawatts. In Europe, Sweden is expected to create by 2020 a fleet consisting of 1,101 gigawatts of wind power 4.

sciences-images66Engineers are currently developing solar thermal plants 14 latest. This time, each set will feature hundreds of mirrors that reflect solar energy towards a central tower acting as a boiler.

The water in the tower will heat up to 550 ° C creating a steam super-hot and that will turn a turbine to generate electricity to be transmitted to homes and businesses connected to that network.

sciences-images67Great compromise between wind turbines offshore and tidal power dam, the turbine SeaGen, located off the coast of Strangford Lough (Ireland) uses the forces of tidal currents to convert them into electricity.

Rooted in the ocean floor, she walks like a windmill. Its two blades 20 meters long and run at a speed of 10-15 revolutions per minute. Operational, this turbine delivers 1.2 megawatts of hydro-electric power which allows full power a thousand homes. She works 20 hours on 24.

sciences-images68The Geysers consist of 21 geothermal power plants spread over an area of 78 km ² which makes them the largest geothermal center in the world. Located 116 km north of San Francisco (United States), these plants get their hot steam into an aquifer and produce about 1000 megawatts. Thirty years ago, the capacity is double because the aquifer was much more voluminous.

This complex provides nearly 60% of electricity use in Northern California that stretches from the Golden Gate Bridge in San Francisco to Oregon.

sciences-images69The Danes have topped the British post at their offshore wind farm Horns Rev 2 located in the North Sea, 35 kilometers off Blaavand Huk, Denmark.

Opened September 17, 2009, this large complex includes 91 turbines capable of generating 800 gigawatts / hour / year of electricity to power approximately 250,000 Danish households. The park is also equipped with a platform called Poseidon housing can accommodate 24 people.

sciences-images70Three giant sea snakes 150 feet long, moving off the coast of Portugal, north of the city of Porto. Do not worry, this is the strong hydraulic Aguçadoura.

Developed by the firm sionals, these three units are divided into four segments interconnected by joints gives them good flexibility. The goal is that all married to the best wave motion.

sciences-images71In terms of installed solar, Spain took the first place. Olmedilla de Alarcón has the largest photovoltaic park in the world with 160,000 solar panels. In a sunny day, they produce 60 megawatts of electricity.

The panels used are flat and made of silicone which makes them heavier and certainly more expensive.

sciences-images72The estuary is home to one of Rance tidal barrage which extends over 332 meters. Located between Dinard and Saint Malo, this plant is unique because it uses tidal power to generate electricity. Indeed, the Rance Tidal provides large amplitudes. The tidal range can reach 8 meters.

Another feature of this plant: it also uses the strong current of the river to work. Thus, 24 bulb turbines or turbine 240 megawatt power running in both directions using both the forces of tides and river. Nearly 500 gigawatts / hour of electricity produced per year by the large complex.

sciences-images73The Finns have made the best of organic matter such as bark of trees, branches and peat. In other words, biomass fuels combustion plant the largest in the world: Oy Alholmens Kraft.

These organic compounds are burned in a huge boiler thereby producing a maximum output of 240 megawatts of electricity. To feed the beast, the Finnish side to cultivate organic matter by planting trees and using peat decomposition nascent plants in wetlands.

sciences-images74Millions displaced and ruined ecosystem later, the famous Three Gorges Dam in China is no longer only flow of ink.

Since 2007, it reached a productivity of 14.1 gigawatts surpassing for the first time the 14 gigawatts of the Itaipu hydroelectric dam on the border between Brazil and Paraguay.

In 2010, the dam is expected to produce 18 gigawatts Chinese power is as much as 18 nuclear power plants. The construction of this building cost a whopping $ 26 billion.

The elastic sheet

Monday, April 26th, 2010

sciences-images60The objective
Would you be able to pass through a sheet of A4 paper, without tearing it?
A surfer’s science, we know how: we’ll show you.
You must
An A4
A rule
Pencil
Scissors

sciences-images61Strain through a sheet:
1 / 4 Fold the foil.
2 / Copy the design of the next page …

sciences-images62Here is the track you must reproduce on your sheet folded in four.

Attention shaded areas are the sides of the folds.

sciences-images633 / Cut out the shaded area, and slit the 12 slots previously drawn.

4 / Stretch and …

sciences-images645 / Stretch the foil carefully, as you can get through!

The history of … Empire State Building

Sunday, April 25th, 2010

sciences-images49Emblem of New York
At its opening on 1 May 1931, the Empire State Building was the tallest skyscraper in the world. Located in New York at number 350 5th Avenue, it remains the symbol of the twentieth century and its technological prowess. It is also one of the most emblematic buildings of the skyline of the Big Apple. From its 443 meters, including antenna, its light shines on the city.

sciences-images50In the late 1930s, the city of New York is passionate about the competition between two men: Walter Chrysler and John Raskob Jakok. They compete to build the highest skyscraper in the city. The first keeps secret the final height of the tower, which became the Chrysler Building. In 1929, John Raskob bought the parcel from the old Waldorf-Astoria, which was demolished and rebuilt on Park Avenue. He urged architects Shreve, Lamb and Harmon who draw the plans. Planned for 80 stories, the building will end in 85, since its competitor, completed in May 1930, was likely to overtake. But Raskob, not comfortable enough, decides to give himself an antenna tower, a sort of hat, which guarantees the ownership of the title of tallest building for some time. Its tower is 381 m against 319 for the Chrysler.

sciences-images51The construction of the building starts March 17, 1930 but already, the teams know they can not achieve the objective of his owner John Raskob. The man wants to beat a double record, the height and speed of building a tower erected in 18 months. To speed up the process, beams, window frames and other components are assembled in a factory Pennsylvania and assembled on site. At the height of its assembly, 3400 workers were present on the site. 57,000 tons of steel were needed to complete the steel skeleton around which is built the tower. On July 21, 1930, the 40th floor and is reached on October 3, the tower has 88. It grows at a rate of four and a half floors per week. In reality, the building will be completed after one year and 45 days of work is November 13, 1930. What an accomplishment for the time.

sciences-images52The Empire State Building was designed in Art Deco full wave. It has no decorations on the walls but its form reflects the strong style: with several levels, like a pyramid. Its elegant facade covered with stone, with large windows for maximum natural light, reflects many of the typical geometric architectural movement. The building comprises a large central cavity, which includes elevators, escalators and the necessary ductwork, which are arranged around the floors. Their size decreases as you go up the tower. It differs from other skyscrapers since its four facades are all visible from the street. Finally, the lobby, also inspired by Art Deco, consists of three floors of colored marble and granite. Its ceiling is decorated with aluminum, platinum and gold leaf.

sciences-images53If he now welcomes tourists and hosts the top companies in its floors, the Empire State Building was not always busy. Worse, his future has been seriously clouded. Its construction has cost 24.7 million dollars in total, John Raskob has disbursed 40.9 million with the purchase of land. And because of the Great Depression that followed the 1929 crisis, half the office is long remained empty. So much so that the building was nicknamed the Empty State Building. Resold by Raskob in 1951 following the financial setbacks and lack of profitability of the project, the building was the center of an unprecedented legal battle. Prudential Trust, which wanted to sell it, was played several American to buy them the famous real estate mogul Donald Trump. It wins in 2000 but following the attacks of September 11, 2001, the building loses its value and ownership changes again in March 2002. Since 2006, the company is owned by W & H Properties.

sciences-images54For 41 years, the Empire State Building remained the tallest building in the world. From 1931 to 1972, he reigned over New York and the world from its 102 floors and its 381 m. In its antenna, that is to say from the ground to the 102nd floor and top floor, it is 320 m. But in 1972, he was dethroned by the twin towers of the World Trade Center, who blithely exceed the height of their 415 and 417 m. Since September 11, 2001 and their collapse, the Empire State Building, found her title of tallest … city. However, the future One World Trade Center, former Freedom Tower, built on the ruins of the World Trade Center, is expected to reach the 541 meters at its completion in 2013. After Willis and Trump Tower Chicago, the Empire State Building remains the third skyscraper highest U.S..

sciences-images55Since its inauguration by President Herbert Hoover on 1 May 1931, at the opening of the World Trade Center in 1972, the Empire State Building was the tallest skyscraper in the world. Its observation deck on the 86th floor sees scroll between 10 and 20,000 people every day. The visitors, who climb the floors with a lift of 76 ultra-fast, enjoy a 360-degree view of Manhattan and its surroundings from the terrace which is 320 m of altitude. A second platform, the 102nd floor, smaller home also curious. Weather permitting, we can see at 130 km radius. Originally, the top of the Empire State Building was topped with a mast for dirigibles hang, the terrace is planned for boarding passengers. But only one airship dwelt September 16, 1931 because after several attempts dangerous, the system was abandoned. The television antenna of the building was added in 1952.

sciences-images56The skyscraper has its share of drama. On July 28, 1945, U.S. B25 bomber piloted by Lieutenant Colonel William Smith goes to Newark Airport. But because of bad weather, dense fog covers the city, the pilot flew with difficulty the island of Manhattan. At 9:49, the camera fits into the 79th floor of the north facade of the building, creating a large hole in 5 m in diameter. The accident caused the explosion of the tank of the aircraft and the burning of part of the building to the 75th floor. As the United States had established the six-day week working to support the effort War, the building was crowded there this Saturday. The crash caused 14 casualties, including 11 people working on the tower. Unfortunately, the Empire regularly makes headlines with the suicide despite protective barriers installed at observation decks. Finally, February 24, 1997, a militant pro-Palestinian fired on the crowd with a firearm since the observation catwalk. The shooting is 8 victims whose assailants. Since then, security measures have been strengthened.

sciences-images57An estimated 110 million people have visited the Empire State Building since it opened to the public. Among them, prestigious personalities like Queen Elizabeth II, Fidel Castro or the footballer Pele. The skyscraper, which was quickly enthralled the crowd with a presence in hundreds of commercials and films, the most famous being the King Kong in 1933. Film fans were also able to contemplate in Superman, and more recently Taxi Driver Independence Day. The building is the subject of a cult with toys and postcards bearing his image. The summit, illumined since 1932, has since 1976 a light color. In 1984, its antenna is colored light to turn at special events. Red for example the 60th anniversary of the Chinese Communist republic. After September 11, 2001, the building finds a renewed interest among tourists for its unique panorama.

sciences-images58Each year, a foot race brings together hundreds of courageous people. Their goal: to climb as quickly as possible the 1576 steps that separate the building’s 86th floor to floor. This race is particularly difficult because of its place: the back stairs of the building are very close. The first race was organized in 1978 and since then has become one of the highlights of the sporting life of New York. On February 2, 2010, the 33rd edition has more passion than 300 participants from 17 countries. The winner, a German aged 25 years, posted a time of 10 minutes and 16 seconds. The first winner, he had taken more than 12 minutes. The absolute record is held by Australian Paul Crake, with 9 minutes and 33 seconds in 2003. But a victim of its success, only selected participants can participate. Some years they are up to a few thousand to apply for 300 seats.

sciences-images59Each Valentine’s Day, 14 pairs of lovers, selected by the love story the most original, marry more than 300 meters high from the 80th floor. The event started in 1994.
The tower owes its name to the name of the State of New York is the Empire State. President George Washington would have given New York and worthy, he said, to host the capital of an empire.
Each year, the building suffered 100 lightning strikes.
It has 1860 steps of the ground floor to the 102nd floor.
The building has 6,500 windows.
Since 1950, the antenna on its roof is used by 19 radio stations and nearly 25 television channels.

Illusions: the transparent screens

Saturday, April 24th, 2010

a98A wooden desk

a97Turf Magic

a92It also works with the iPhone

a93And with a TV?

a94A garden in her computer

a95Game highlights

a96Subdued lighting

a90No, you do not dream, the computer screen does not disappear, it is an optical illusion! This technique of “transparent screens” allows experimentation bluffing and fun.

a91The technique of transparent screens is performed without alteration. The background is actually photographed and inserted as a wallpaper on the computer desktop. Then it is all about adjustment to make the illusion perfect.

a99Membership Office

a100On the floor

a101Work atmosphere

a102Office Magic

a103Still life

a104Good perspective

Raptor: the ultimate fighter

Tuesday, April 13th, 2010

sciences-imagesPictures of the F-22 Raptor, made by Pascal Le Fichant are exceptional because they are the only story he has been able to do on this fighter in Europe. In the early 1980s, when the War Cold is still valid, the U.S. aircraft manufacturers charge Lockheed Martin and Boeing to develop the best fighter in the world. It should outperform all existing devices and to involve the most advanced technologies in performance, maneuverability, stealth, weapons systems and electronic warfare.

sciences-images1Replacing the legendary F-15 Eagle, F-22 must provide the U.S. Air Force has an absolute advantage in the exclusive air superiority missions. Unlike the F-16 and F/A-18, the Pentagon objected to its sale to other powers.

sciences-images2The angular forms of the gene Raptor evoke the legendary F-117 Night Hawk Night Hawk “, the recently retired. The fuselage, covered with a paint absorbent, contains no right angles, but instead forms may prevent the reflection of radar waves. For the same purpose, the glass cockpit is covered with a layer of gold. Result, the F-22 is a hundred times less visible on radar as its predecessor, the F-15.

sciences-images3Forms blunt missiles, bombs and tanks hung under the wings of fighter planes are particularly damaging to their radar signature. To keep intact the potential stealth form, the Raptor carries his weapons in bunkers which are open only when needed. Even the gun used for close combat is protected by a trap.

sciences-images4Despite its stealth requirements, and unlike the totally original forms of the F-117,
F-22 is very American in its architecture. With its configuration trapezoidal wings, horizontal stabilizers and twin vertical fins, it follows the descent of the F-15 and
F/A-18 very different from the delta wing and “duck” (planning ahead of the wings) of the Eurofighter, Gripen and Rafale.

sciences-images5The articulated nozzles of the F-22 engines are integrated into the fuselage and protected by a layer of ceramic coating to make it more discrete heat emissions.

sciences-images6Loaded Antenna (thirty) embedded in its fuselage, the F-22 features a latest generation radar with a range of 200 km. The data are processed by a computer capable of handling 700 million operations per second. In the cockpit, six color multifunction displays are responsible for informing the driver. A real computer room.

sciences-images7Due to the ever increasing efficiency of weapons systems, the top speed of fighter aircraft is no longer as dominant as during the Cold War. The Raptor is still a brute: 30% more powerful than its predecessor F-15 yet known in this area, it offers almost two times more thrust than the Rafale, which however is lighter.

sciences-images8The supercroisière is the ability of an airplane to fly at speeds greater than Mach (speed of sound), without using the afterburner major setback in consumption and range. If it exceeds Mach 2 with the afterburner, the F-22 is also the only aircraft capable of flying supercroisière, more than Mach 1.5 in combat configuration. This is one of its major assets.

sciences-images9In air combat, a pilot may run out of missiles and the obligation to continue the commitment to the canon. The handling of the aircraft becomes essential. Like some Russian fighters (Mig 29 and Sukhoi 27 for example), the F-22 is equipped with thrusters articulated for diverting the flow reactor and increase maneuverability. The thrust vector also shortens the takeoff distances.

sciences-images10No Cobra, too typed “Russian” in the demonstration flight of F-22. The figure of reference is the “J-Turn”, a sort of slippage in breathtaking three dimensions. And there are many others, both possibilities seem endless, the Raptor. The American pilot demonstration would give heart to joy, in improbable acrobatic ballet, performed aboard their 20-ton monster vacuum.

sciences-images11The F-22 is far from the canons of beauty of the hunter, once known quick, lively and racy. On the contrary, a large aircraft is 19 meters long, 13.5 meters wide and 36 tons at full load (for information, measurements of the Rafale are 15m, 11m and 24 tonnes). Rather clumsy on the ground, it is only once in the air that the Raptor demonstrates the breadth of his immense potential.

sciences-images12To make your mouth water, here is the beginning of the presentation of the Raptor with the Royal Air Tattoo at Fairford air base (GB). We are mid-July, the English summer in full swing and the runway has been flooded by a torrential downpour. Post-combustion “ON”, Major Paul Moga, Chief Pilot Demonstration F-22 will show the public what his horse was in the belly.

sciences-images13After a sudden acceleration, the driver tore off his plane from the runway, retract the landing gear immediately and prevents the F-22 to climb to catch up to speed.

sciences-images14To the delight of the few spectators present at the event, the pilot keeps the aircraft a few feet high throughout the takeoff phase.

sciences-images15The aircraft is now about 500 km / h. The flames of post-combustion (rather quiet on the stealth F-22) are synonymous with unbridled consumption of kerosene. The features of supercroisière “economy” of the Raptor, the PC is used only for short acceleration phases.

sciences-images16Things are “serious” can begin and, after 3 km made less than 20 meters above the ground, Major Paul Moga seems to have finally decided to gain altitude.

sciences-images17The show is launched. As driven by an invisible elastic, the Raptor is catapulted into the sky by the power of its two reactors. The thrust created by its articulated nozzles instantly gives an angle of climb impressive.

sciences-images18The aircraft is now mounted vertically, 20 seconds after brake release. The demonstration flight can begin.

sciences-images19During this transition to high speed, between showers, the F-22 passes areas of moist air condenses instantly in a very spectacular phenomenon. The aircraft, already stealth, can then halo a cloud of the most beautiful effect.

sciences-images20Technology Demonstration masterful leadership, the American F-22 is both a success and failure. The Reagan administration launched the project and the first tender on a 700 aircraft. The military requirements, delays the need to use best available technology in a rapidly changing electronics industry, quickly doubled the initial price of the aircraft ($ 40 million in the early 1980s).

sciences-images21The future is likely to devices smaller than the F-22, less exclusive and could be widely disseminated within the framework of technical cooperation between countries and between industries. It is in this spirit that developed the F-35 multi-role fighter Future U.S., which exists in several versions, including a board and take off vertically. The Raptors dominated the world of aerospace defense.

A sand yacht moving at 202 km / h

Thursday, April 1st, 2010

a“It was a difficult record to beat,” says the proud British pilot and engineer Richard Jenkins. And it has something to gloat since March 26 last, he stated bluntly shatters the previous record speed on land yachting with his creation, Greenbird.

This high-tech gear displayed on the meter over 202 km / h is 16 km / h higher than the previous record held for ten years by American Bob Schumacher.

a1For over ten years, the Englishman Richard Jenkins invented and conceptualized this technological marvel. Greenbird is a tasty blend of several technologies from the aerospace, Formula 1, but also for sailing.

Jenkins was inspired to fully optimize the speed of movement of the tank.

a2The fuselage is made of carbon fibers, giving it a weight of 600 pounds. This material can combine both light enough to increase the speed but also robust to avoid damage during the registration record.

a3The sail is based entirely from the operation of the aircraft wing. The air pressure exerted over a wing is greater than that exerted below, this difference in pressure allows the airplane to fly and gain altitude.

In this case, Greenbird uses this principle to move forward. How? By placing the wing as a sail: vertical!

a4The aerodynamics of Greenbird is paramount. The engineer went about it several times to reduce the maximum drag. This slows the movement of the car if it is too high. The thrust generated by wind is not sufficient by itself.

a5The day’s record, the wind was blowing at nearly 50 km / h. How did the car could reach 200 km / h with just the wind?

Sailing is calibrated to good use, not the actual wind, but the apparent wind says. It feels that the person placed on the float.

a6By quadrupling the speed of the machine, there is a risk of tipping. To avoid this, the engineer Richard Jenkins was inspired by F1 and their front wing.

The mast is carbon fiber with a horizontal wing to “fix” the tank to the ground and prevent any slip at full speed.

a7The Englishman Richard Jenkins does not confine himself solely to a land yachting, he has crafted a special ice. Instead of wheels, he put the skates. Logical!

The frames that are different from those of char land and are composed of fiberglass. Objective: to increase the suspension to better manage and control the vehicle on the ice. Next record speed to beat this winter.

Solar Planet: first images

Sunday, March 28th, 2010

a113On February 25, 2010, the largest solar boat in the world was unveiled for the first time its futuristic lines. The official ceremony was held at the HDW shipyard in Kiel (Germany).

a114The catamaran was designed to achieve a world tour to solar energy: a challenge and a world first. PlanetSolar team wants to demonstrate that it is possible, using technology and knowledge current, moving from the era of oil to the sun and its phenomenal power.

a11530 meters long and 16 meters wide, the 60-ton catamaran was equipped with 500 m² of photovoltaic solar panels. Quiet and clean, it navigates to an average speed of about 8 knots during its world tour in 2011.

a116The design of the catamaran began in March 2006. PlanetSolar engineers have managed in the propulsion, the manufacture of solar panels, energy storage, the choice of materials, marine, hydro and aerodynamics of the boat and routing. In 2008 began the construction itself. And in February 2010 finally PlanetSolar has been unveiled.

a117PlanetSolar will start its world tour in April 2011. It will be “piloted” by Raphaël Domjan, 38, and Gerard d’Aboville, 64, who has made the crossing of the Atlantic and Pacific rowing.

a118PlanetSolar accomplish its world tour with stops along the equator, where sunshine is greatest. This journey of more than 40 000 km should be done in 140 days (if the average of 8 knots is observed) via the Atlantic Ocean, the Panama Canal, Pacific Ocean, Indian Ocean and finally the channel Suez to join the Mediterranean. The stops (New York, San Francisco, Singapore and Abu Dhabi) should help to promote the project PlanetSolar and renewable energy.

a119Before this huge world tour, the boat will be launched in Kiel in late March to perform the first tests. The general public will discover PlanetSolar during Hafengeburtstag Hamburg (the 821st birthday of German port), 7 on May 9

a120PlanetSolar The project has cost 18 million euros. “It’s a unique feeling to see a boat today which I dreamed so much,” he told the Swiss Raphaël Domjan. “We want to Phileas Fogg of the 21st century” [heroes "Around the World in 80 Days" by Jules Verne, editor's note].