Three-dimensional moving holograms breakthrough

A team led by University of Arizona (UA) optical sciences professor Nasser Peyghambarian has developed a new type of “holographic telepresence” that allows remote projection of a three-dimensional, moving image without the need for special eyewear such as 3D glasses or other auxiliary devices.

The technology is likely to take applications ranging from telemedicine, advertising, updatable 3D maps and entertainment to a new level.

The journal Nature chose the technology to feature on the cover of its Nov. 4 issue.

“Holographic telepresence means we can record a three-dimensional image in one location and show it in another location, in real-time, anywhere in the world,” said Peyghambarian, who led the research effort.
“Holographic stereography has been capable of providing excellent resolution and depth reproduction on large-scale 3D static images,” the authors wrote, “but has been missing dynamic updating capability until now.”
“At the heart of the system is a screen made from a novel photorefractive material, capable of refreshing holograms every two seconds, making it the first to achieve a speed that can be described as quasi-real-time,” said Pierre-Alexandre Blanche, an assistant research professor in the UA College of Optical Sciences and lead author of the Nature paper.

The prototype device uses a 10-inch screen, but Peyghambarian’s group is already successfully testing a much larger version with a 17-inch screen. The image is recorded using an array of regular cameras, each of which views the object from a different perspective. The more cameras that are used, the more refined the final holographic presentation will appear.

That information is then encoded onto a fast-pulsed laser beam, which interferes with another beam that serves as a reference. The resulting interference pattern is written into the photorefractive polymer, creating and storing the image. Each laser pulse records an individual “hogel” in the polymer. A hogel (holographic pixel) is the three-dimensional version of a pixel, the basic units that make up the picture.

The hologram fades away by natural dark decay after a couple of minutes or seconds depending on experimental parameters. Or it can be erased by recording a new 3D image, creating a new diffraction structure and deleting the old pattern.

Peyghambarian explained: “Let’s say I want to give a presentation in New York. All I need is an array of cameras here in my Tucson office and a fast Internet connection. At the other end, in New York, there would be the 3D display using our laser system. Everything is fully automated and controlled by computer. As the image signals are transmitted, the lasers inscribe them into the screen and render them into a three-dimensional projection of me speaking.”

The overall recording setup is insensitive to vibration because of the short pulse duration and therefore suited for industrial environment applications without any special need for vibration, noise or temperature control.

One of the system’s major hallmarks never achieved before is what Peyghambarian’s group calls full parallax: “As you move your head left and right or up and down, you see different perspectives. This makes for a very life-like image. Humans are used to seeing things in 3D.”

The work is a result of a collaboration between the UA and Nitto Denko Technical, or NDT, a company in Oceanside, Calif. NDT provided the polymer sample and media preparation. “We have made major advances in photorefractive polymer film fabrication that allow for the very interesting 3D images obtained in our Nature article,” said Michiharu Yamamoto, vice president at NDT and co-author of the paper.

Potential applications of holographic telepresence include advertising, updatable 3D maps and entertainment. Telemedicine is another potential application: “Surgeons at different locations around the world can observe in 3D, in real time, and participate in the surgical procedure,” the authors wrote.

The system is a major advance over computer-generated holograms, which place high demands on computing power and take too long to be generated to be practical for any real-time applications.

Currently, the telepresence system can present in one color only, but Peyghambarian and his team have already demonstrated multi-color 3D display devices capable of writing images at a faster refresh rate, approaching the smooth transitions of images on a TV screen. These devices could be incorporated into a telepresence setup in the near future.

Source: http://www.kurzweilai.net

Read more »

Pope's astronomer says he would baptise an alien if it asked him

An alien – 'no matter how many tentacles it has' – could have a soul, says pope's astronomer

Aliens might have souls and could choose to be baptised if humans ever met them, a Vatican scientist said today. The official also dismissed intelligent design as "bad theology" that had been "hijacked" by American creationist fundamentalists.

Guy Consolmagno, who is one of the pope's astronomers, said he would be "delighted" if intelligent life was found among the stars. "But the odds of us finding it, of it being intelligent and us being able to communicate with it – when you add them up it's probably not a practical question."

Speaking ahead of a talk at the British Science Festival in Birmingham tomorrow, he said that the traditional definition of a soul was to have intelligence, free will, freedom to love and freedom to make decisions. "Any entity – no matter how many tentacles it has – has a soul." Would he baptise an alien? "Only if they asked."

Consolmagno, who became interested in science through reading science fiction, said that the Vatican was well aware of the latest goings-on in scientific research. "You'd be surprised," he said.

The Pontifical Academy of Sciences, of which Stephen Hawking is a member, keeps the senior cardinals and the pope up-to-date with the latest scientific developments. Responding to Hawking's recent comments that the laws of physics removed the need for God, Consolmagno said: "Steven Hawking is a brilliant physicist and when it comes to theology I can say he's a brilliant physicist."

Consolmagno curates the pope's meteorite collection and is a trained astronomer and planetary scientist at the Vatican's observatory. He dismissed the ideas of intelligent design – a pseudoscientific version of creationism. "The word has been hijacked by a narrow group of creationist fundamentalists in America to mean something it didn't originally mean at all. It's another form of the God of the gaps. It's bad theology in that it turns God once again into the pagan god of thunder and lightning."

Consolmagno's comments came as the pope made his own remarks about science this morning at St Mary's University College in Twickenham. Speaking to pupils, he encouraged them to look at the bigger picture, over and above the subjects they studied. "The world needs good scientists, but a scientific outlook becomes dangerously narrow if it ignores the religious or ethical dimension of life, just as religion becomes narrow if it rejects the legitimate contribution of science to our understanding of the world," he said. "We need good historians and philosophers and economists, but if the account they give of human life within their particular field is too narrowly focused, they can lead us seriously astray."

The pope's astronomer said the Vatican was keen on science and admitted that the church had got it "spectacularly wrong" over its treatment of the 17th century astronomer Galileo Galilei. Galileo confirmed that the Earth went around the sun – and not the other way around – and was charged with heresy in 1633. He spent the rest of his life under house arrest in Tuscany. Only in 1992 did Pope John Paul admit that the church's treatment of Galileo had been a mistake.

Consolmagno said it was a "complete coincidence" that he was speaking at the British Science Festival at the same time as the papal visit.

Source <www.guardian.co.uk>

Read more »

Homer Simpson 'is a true Catholic'

The long-running cartoon series explores issues such as family, community, education and religion in a way that few other popular television programmes can match, according to L'Osservatore Romano, the Vatican's daily broadsheet.

The newspaper acknowledged that Homer snores through the sermons of the Reverend Lovejoy and inflicts "never-ending humiliation" on his evangelical neighbour, Ned Flanders.

But in an article headlined "Homer and Bart are Catholics", the newspaper said: "The Simpsons are among the few TV programmes for children in which Christian faith, religion, and questions about God are recurrent themes."

The family "recites prayers before meals and, in their own peculiar way, believes in the life thereafter".

It quoted an analysis by a Jesuit priest, Father Francesco Occhetta, of a 2005 episode of The Simpsons, The Father, the Son and the Holy Guest Star, which revolved around Catholicism and was aired a few weeks after the death of Pope John Paul II.

The episode starts with Bart being expelled from Springfield Elementary School and being enrolled in a Catholic school where he meets a sympathetic priest, voiced by the actor Liam Neeson, who draws him into Catholicism with his kindness.

Homer then decides to convert to Catholicism, to the horror of his wife Marge, the Rev Lovejoy and Ned Flanders. The episode touches on issues such as religious conflict, interfaith dialogue, homosexuality and stem cell research.

"Few people know it, and he does everything he can to hide it, but it is true: Homer J Simpson is a Catholic," insists L'Osservatore Romano.

It is not the first time that the Vatican newspaper has praised The Simpsons. Last December, as the television series celebrated its 20th anniversary, the paper said that "the relationship between man and God" is one of its most important themes and that it often mirrored the "religious and spiritual confusion of our times".

Once a staid and sober paper of record, L'Osservatore Romano has ventured into popular culture in the last three years under a new editor, commenting on everything from The Beatles and The Blues Brothers to the blockbuster film Avatar and the Harry Potter books and films.

Source <www.telegraph.co.uk>

Read more »

OLDEST MAN-MADE STRUCTURE FOUND IN GREEK CAVE

The oldest known example of a man-made structure was found within a prehistoric cave in central Greece, according to the Greek culture ministry.

The structure is a stone wall that blocked two-thirds of the entrance to the Theopetra cave near Kalambaka on the north edge of the Thessalian plain. It was constructed 23,000 years ago, probably as a barrier to cold winds.

“An optical dating test, known as Optically Stimulated Luminescence, was applied on quartz grains nested within the stones. We dated four different samples from the sediment and soil materials, and all provided identical dates,” Nikolaos Zacharias, director of the laboratory of archaeometry at the University of Peloponnese, told Discovery News.

According to a statement by the ministry of culture, “the dating matches the coldest period of the most recent ice age, indicating that the cavern’s inhabitants built the stone wall to protect themselves from the cold.”

Excavated since 1987, the Theopetra cave is well known to palaeontologists as it was used and inhabited continuously from the Palaeolithic period onwards (50,000 to 5,000 years ago).

“The newly discovered stone structure is important as it shows the technological level of humans at that time,” Zacharias said.

Source: http://news.discovery.com

Read more »

British Library posts Greek manuscripts to Web

By RAPHAEL G. SATTER 

LONDON — One of the world's most important caches of Greek manuscripts is going online, part of a growing number of ancient documents to hit the Web in recent years.

The British Library said Monday that it was making more than a quarter of its 1,000 volume-strong collection of handwritten Greek texts available online free of charge, something curators there hope will be a boon to historians, biblical scholars and students of classical Greece alike.

Although the manuscripts — highlights of which include a famous collection of Aesopic fables discovered on Mount Athos in 1842 — have long been available to scholars who made the trip to the British Library's reading rooms, curator Scot McKendrick said their posting to the web was opening antiquity to the entire world.
McKendrick said that London could be an expensive place to spend time poring over the Greek texts' tiny, faded script or picking through hundreds of pages of parchment.

"Not every scholar can afford to come here weeks and months on end," he said. The big attraction of browsing the texts online "is the ability to do it at your own desk whenever you wish to do it — and do it for free as well."

Although millions of books have been made available online in recent years — notably through Google Books' mass scanning program — ancient texts have taken much longer to emerge from the archives.

They don't suffer from the copyright issues complicating efforts to post contemporary works to the Web, but their fragility makes them tough to handle. They have to be carefully cracked open and photographed one page at a time, a process the British Library said typically costs about 1 pound ($1.50) per page.
John Franklin, an associate professor of classics at the University of Vermont, said that the British Library's efforts were "part of a quite general move to making manuscripts available online."

"Hundreds of institutions have done or are doing the same," he said, including his university.

Franklin said it was "wonderful that the general public can have an intimate view of so many manuscripts," but stressed the material's academic applications, noting that it could serve as a teaching aid for students learning to unravel medieval Greek handwriting, for example.

The British Library has worked aggressively to put much of its collection on the Internet, from 19th-century newspapers to the jewels of its collection — The Lindisfarne Gospels, a selection of Leonardo da Vinci's sketches and the Codex Sinaiticus, the oldest surviving complete copy of the Christian Bible.
The library's Greek manuscript project was funded by the Stavros Niarchos Foundation, which supports Greek-related initiatives in arts and culture.
Another batch of about 250 documents is due to be published online in 2012.
___
Online:
The British Library: http://www.bl.uk/manuscripts
The Stavros Niarchos Foundation: http://www.snf.org

Source: Associated Press

Read more »

Mona Lisa's Childhood Home Found

Read more »

Forever young: Secret of eternal life revealed by Russian science?

Read more »