Followers

Friday, June 6, 2008

Egypt uncovers 'missing' pyramid of a pharaoh

SAQQARA, Egypt - Egyptian archaeologists unveiled on Thursday a 4,000-year-old "missing pyramid" that is believed to have been discovered by an archaeologist almost 200 years ago and never seen again.

Zahi Hawass, Egypt's antiquities chief, said the pyramid appears to have been built by King Menkauhor, an obscure pharaoh who ruled for only eight years.

In 1842, German archaeologist Karl Richard Lepsius mentioned it among his finds at Saqqara, referring to it as number 29 and calling it the "Headless Pyramid" because only its base remains. But the desert sands covered the discovery, and no archaeologist since has been able to find Menkauhor's resting place.

"We have filled the gap of the missing pyramid," Hawass told reporters on a tour of the discoveries at Saqqara, the necropolis and burial site of the rulers of ancient Memphis, the capital of Egypt's Old Kingdom, about 12 miles south of Cairo.

The team also announced the discovery of part of a ceremonial procession road where high priests, their faces obscured by masks, once carried mummified sacred bulls worshipped in the ancient Egyptian capital of Memphis.

The pyramid's base — or the superstructure as archeologists call it — was found after a 25-foot-high mound of sand was removed over the past year and a half by Hawass' team.

Hawass said the style of the pyramid indicates it was from the Fifth Dynasty, a period that began in 2,465 B.C. and ended in 2,325 B.C. That would put it about two centuries after the completion of the Great Pyramid of Giza, believed to have been finished in 2,500 B.C.

Another proof of its date, Hawass says, was the discovery inside the pyramid of a gray granite lid of a sarcophagus, of the type used at that time.

The rectangular base, at the bottom of a 15 foot-deep pit dug out by workers, gives little indication of how imposing the pyramid might have once been. Heaps of huge rocks, many still partially covered in sand and dust, mark the pyramid's walls and entrance, and a burial chamber was discovered inside.

Archaeologists have not found a cartouche — a pharaoh's name in hieroglyphs — of the pyramid's owner. But Hawass said that based on the estimated date of the pyramid he was convinced it belonged to Menkauhor.

Work continues at the site, where Hawass said he expected to unearth "subsidiary" pyramids around Menkauhor's main one, and hoped to find inscriptions there to back up his claim.

The partial ceremonial procession road unveiled Thursday dates back to the Ptolemaic period, which ran for about 300 years before 30 B.C.

It runs alongside Menkauhor's pyramid, leading from a mummification chamber toward the Saqqara Serapium, a network of underground tombs where sacred bulls were interred, discovered by French archaeologist August Mariette in 1850.

A high priest would carry the mummified bulls' remains down the procession road — the only human allegedly allowed to walk on it — to the chambers where the bulls would be placed in sarcophagi, Hawass said.

Ancient Egyptians considered Apis Bulls to be incarnations of the city god of Memphis and connected with fertility and the sun-cult. A bull would be chosen for its deep black coloring and would be required to have a single white mark between the horns. Selected by priests and honored until death, it was then later mummified and buried in the underground galleries of the Serapium.

The procession route's discovery "adds an important part to our knowledge of the Old Kingdom and its rituals," Hawass said.

The sprawling archaeological site at Saqqara is most famous for the Step Pyramid of King Djoser — the oldest of Egypt's over 100 pyramids, built in the 27th century B.C.

Although archaeologists have been exploring Egypt for some 200 years, Hawass says only a third of what lies underground in Saqqara has been discovered.

"You never know what secrets the sands of Egypt hide," he said. "I always believe there will be more pyramids to discover."

Original here

Holodeck 1.0? Star Trek-style 3-D Displays Make Their Debut


Star Trek's holodeck is a famous science fiction concept. Crewmembers could walk through the garden of their childhood home, re-enact famous historical events or watch full, 3-D performances of famous plays.The holodeck is still science fiction, but last year researchers took the first, confident steps towards its realisation with the Coherent project. (Credit: iStockphoto)

Star Trek's holodeck is a famous science fiction concept. Crewmembers could walk through the garden of their childhood home, re-enact famous historical events or watch full, 3-D performances of famous plays. It was a rich source of story lines for the Star Trek writers because the holodeck offered so many opportunities to work, rest and play.

Crewmembers could also learn by using simulations to acquire new skills or execute training drills. They could simulate surgery, flight, and engine repairs in a truly realistic environment.

The holodeck is still science fiction, but last year researchers took the first, confident steps towards its realisation with the Coherent project. This EU-funded research project, developed a commercial, true 3-D display that could one day be called Holodeck version 1.0. It is called HoloVizio.

Innovation intensive

The HoloVizio is a 3-D screen that will allow designers to visualise true 3-D models of cars, engines or components. Better yet, gesture recognition means that observers can manipulate the models by waving their hands in front of the screen. The function offers enormous scope for collaboration across the globe.

"The aim of the COHERENT project was to create a new networked holographic audio-visual platform to support real-time collaborative 3-D interaction between geographically distributed teams," explains Akos Demeter, spokesperson for the project.

Two applications drove the design of the basic networked audiovisual components – a collaborative visualisation system for the medical sector and a collaborative design review system for the automotive industry.

The researchers based the display component on innovative holographic techniques that can present, at natural human interaction scale, realistic animated 3-D images simultaneously to an unlimited number of freely moving viewers.

No goggles required

The upshot is that users do not need goggles, and the 3-D image is maintained as they move about – both in contrast with early attempts at holographic displays. But the real star of the Coherent project is not simply the display. The researchers made exciting advances in enabling applications that show the system's real potential.

The COMEDIA application, for example, uses raw data from medical imaging devices to create 3-D models of anatomy. The development, led by Coherent partner CRS4 Visual Computing, demonstrated the system to 50 clinicians in Italy.

"The strength of the COMEDIA system is related to the collaboration, discussion and evaluation of clinical cases, since it provides users with an immediate 3-D understanding of the anatomy shown," explains Demeter.

COMEDIA led to the 'Holo-Heart' series of seminars last year.

Art's hidden secrets

CRS4 also developed rendering and visualisation software that may reveal the artistic secrets of the great masters, like Michelangelo. A scan of his famous David revealed that the eyes diverge.

It is impossible to see this by standing in front of the statue, because of its height and the position of the left forearm. But it becomes clear when viewed through the COHERENT system, and theorists posit that Michelangelo wanted to present two different faces of the same character.

Coherent also led to the development of the COLLAUDA application for collaborative automotive design. The application, developed with CS Systemes d’Information and Peugeot in France, led to a series of demonstrations to potential end users.

The demonstration led to a new project collaboration, named ARIVA, which starts in June 2008.

Oil exploration

Finally, COHERENT's researchers explored the potential for applying holographic systems for oil exploration, using Shell's data. The system displayed real examples of subsurface data. Holografika, the Hungarian research company behind the Holovizio system, developed a lot of the core technology used by the project.

In all, the team developed useful applications for a leading edge, emergent technology, explored excellent commercial opportunities and perfected holographic and allied systems for real-world use. The research also stimulated enormous interest in the area and prompted a wave of activity in the sector. But history, perhaps, will remember the Coherent project as the precursor to a real world holodeck.

Original here



Boeing Successfully Fires 25 kW Solid-State Lasers, Laser Weapons One Step Closer to Being a Reality

Boeing has just tested its new thin-disk laser, the most powerful solid-state laser ever made. It fires at over 25 kilowatts, with the scalability proven to go up to a 100 kilowatt laser in the coming years. A 100 kW laser would be the most powerful ever made, one that has a lot of challenges to overcome, including reducing the excess heat generated by such a powerful laser and maintaining the quality of the beam over distances. But even a 25 kW laser is extremely powerful. As the press release says, it "will damage, disable or destroy targets at the speed of light, with little to no collateral damage, supporting missions on the battlefield and in urban operations." Hit the jump for the full release.

Boeing Fires New Thin-Disk Laser, Achieving Solid-State Laser Milestone

ST. LOUIS, June 03, 2008 — The Boeing Company [NYSE: BA] fired its new thin-disk laser system repeatedly in recent tests, achieving the highest known simultaneous power, beam quality and run time for any solid-state laser to date.

In each laser firing at Boeing's facility in West Hills, Calif., the high-energy laser achieved power levels of over 25 kilowatts for multi-second durations, with a measured beam quality suitable for a tactical weapon system. The Boeing laser integrates multiple thin-disk lasers into a single system. Through these successful tests, the Boeing team has proven the concept of scalability to a 100-kilowatt-class system based on the same architecture and technology.

"Solid-state lasers will revolutionize the battlefield by giving the warfighter an ultra-precision engagement capability that can dramatically reduce collateral damage," said Scott Fancher, vice president and general manager of Boeing Missile Defense Systems. "These successful tests show that Boeing has made solid progress toward making this revolutionary capability a reality."

The thin-disk laser is an initiative to demonstrate that solid-state laser technologies are now ready to move out of the laboratory and into full development as weapon systems. Solid-state lasers are powered by electricity, making them highly mobile and supportable on the battlefield. The Boeing laser represents the most electrically efficient solid-state laser technology known. The system is designed to meet the rapid-fire, rapid-retargeting requirements of area-defense, anti-missile and anti-mortar tactical high-energy laser systems. It is also ideal for non-lethal, ultra-precision strike missions urgently needed by warfighters in war zones.

"This accomplishment demonstrates Boeing's commitment to advancing the state of the art in directed energy technology," said Gary Fitzmire, vice president and program director of Boeing Directed Energy Systems. "These successful tests are a significant milestone toward providing reliable and supportable lasers to U.S. warfighters."

Boeing's approach incorporates a series of commercial-off-the-shelf, state-of-the-art lasers used in the automotive industry. These industrial lasers have demonstrated exceedingly high reliability, supportability and maintainability.

A high-power solid-state laser will damage, disable or destroy targets at the speed of light, with little to no collateral damage, supporting missions on the battlefield and in urban operations.

Original here