Engineers create 'optical cloaking' design for invisibility | |
to reveal another image ' (OP) User ID: 90967 Netherlands 04/02/2007 09:20 PM Report Abusive Post Report Copyright Violation | Chroma key A chroma key is the removal of a color (or small color range) from one image to reveal another image 'behind' it. The removed color becomes transparent. This technique is also referred to as "color keying", "colour-separation overlay" ("CSO") (primarily by the BBC[1]), "greenscreen" and "bluescreen". It is commonly used for weather forecast broadcasts, wherein the presenter appears to be standing in front of a large map, but in the studio it is actually a large blue or green background. The process [link to en.wikipedia.org] |
Anonymous Coward (OP) User ID: 90967 Netherlands 04/02/2007 09:27 PM Report Abusive Post Report Copyright Violation | Re: The Two Humanitys a theoritical history "The Blue Screen / Chroma Key Page" Quoting: Anonymous Coward 90967What is Blue Screen Imaging? [link to www.seanet.com] Blue Krishna As in more traditional depictions of Krishna, blue represents the vastness of the sea as infinity [link to www.krishnaconcepts.com] [link to www.godlikeproductions.com] |
Anonymous Coward (OP) User ID: 90967 Netherlands 04/02/2007 09:30 PM Report Abusive Post Report Copyright Violation | Chinese discovery casts doubt on 'Out of Africa' theory: study The ancient remains of an early modern human found in Beijing suggests the "Out of Africa" theory of the dispersal of humans may be more complex than first thought, a study released Monday said. The fossilized remains date to 38,000 to 42,000 years ago, making it the oldest modern human skeleton from eastern Eurasia, and one of the oldest modern humans from the region, the authors of the paper said. [link to www.physorg.com] |
Anonymous Coward (OP) User ID: 90967 Netherlands 04/02/2007 09:30 PM Report Abusive Post Report Copyright Violation | |
wing-ed User ID: 152412 United States 04/02/2007 10:11 PM Report Abusive Post Report Copyright Violation | Chinese discovery casts doubt on 'Out of Africa' theory: study Quoting: Anonymous Coward 90967The ancient remains of an early modern human found in Beijing suggests the "Out of Africa" theory of the dispersal of humans may be more complex than first thought, a study released Monday said. The fossilized remains date to 38,000 to 42,000 years ago, making it the oldest modern human skeleton from eastern Eurasia, and one of the oldest modern humans from the region, the authors of the paper said. [link to www.physorg.com] Praise The Holy Of Holy :: They do not list a method of dating the bones! Who guessed? Praise The Lamb: Amen Holy, holy,holy, Lord God Almighty, which was, and is, and is to come.Praise the one who gives you peace beyond all understanding Yes that scripture still sounds good ! |
Anonymous Coward (OP) User ID: 90967 Netherlands 04/03/2007 11:10 AM Report Abusive Post Report Copyright Violation | |
Anonymous Coward (OP) User ID: 90967 Netherlands 04/03/2007 11:11 AM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 630722 Netherlands 03/20/2009 02:48 PM Report Abusive Post Report Copyright Violation | March 13th, 2009 By Miranda Marquit (PhysOrg.com) -- "Many groups have been working devices that make objects invisible," Che Ting Chan tells PhysOrg.com. “Most of these devices, however, encompass the object to be cloaked.” Chan, a scientist at The Hong Kong University of Science and Technology, believes that it is possible to create a cloaking device that would be able to render an object invisible without encompassing it. [link to www.physorg.com] |
Anonymous Coward User ID: 630722 Netherlands 03/20/2009 02:58 PM Report Abusive Post Report Copyright Violation | “With the devices that encompass the object,” Chan continues, “the cloaked subject is ‘blind’. It can’t ‘see’ out through the cloak. We can’t see the object, but the object can’t see us, either. We wanted to create a conceptual design that would let the object ‘see’ out through the cloak while hiding it from sight.” Along with Yun Lai, Huanyang Chen and Zhao-Qing Zhang, Chan believes that this could be accomplished. Their ideas are published in Physical Review Letters: “Complementary Media Invisibility Cloak that Cloaks Objects at a Distance Outside the Cloaking Shell.” Right now, such a device exists only theory. “We haven’t built the device,” Chan says, “but we have shown mathematically how it could work. It is a very specific description of the materials needed. If you have the time and resources, we think it could be done.” He points out that it might have interesting possibilities in a number of fields where invisibility might be desirable. Theoretically, a device such as Chan suggests, would work through complementary media. “Our strategy is to put the cloaking device and the object to be cloak next to each other. The cloaking device is a kind of anti-object. The way the light is gathered and scattered by the two objects - the cloaking device and the object it is making invisible - would cancel each other out.” Chan continues by explaining that the cloaking device would become invisible as well. “Both must be invisible in order for this to be effective, and I think we have shown in theory how this could work.” [link to www.physorg.com] |
Anonymous Coward User ID: 630722 Netherlands 03/20/2009 03:01 PM Report Abusive Post Report Copyright Violation | Science is beginning to sound more like magic by the day. More information: Yun Lai, Huanyang Chen, Zhao-Qing Zhang, and C. T. Chan, “Complementary Media Invisibility Cloak that Cloaks Objects at a Distance Outside the Cloaking Shell.” Physical Review Letters (2009). Available online: [link to link.aps.org] . [link to images.google.com] |
Anonymous Coward User ID: 630722 Netherlands 03/20/2009 03:05 PM Report Abusive Post Report Copyright Violation | [link to images.google.com] [link to www.eurekalert.org] Animation of the Action Density in 4 Dimensions - 1543 kb Half Size - 520 kb [link to www.physics.adelaide.edu.au] [link to www.physics.adelaide.edu.au] |
Anonymous Coward User ID: 182970 United States 03/20/2009 03:08 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 630722 Netherlands 03/20/2009 03:09 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 630722 Netherlands 03/20/2009 03:10 PM Report Abusive Post Report Copyright Violation | this is useful. Quoting: Anonymous Coward 182970"I honestly didn't see those government agents trespassing on my property. I was just shooting at some targets out there in the field. "Magic on the Menu" is the other show by the Three Magicians |
Sentient Primate User ID: 637344 United States 03/20/2009 03:12 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 630722 Netherlands 03/20/2009 03:15 PM Report Abusive Post Report Copyright Violation | ~ bio in sl. means (he) was [link to www.cosmicastronomy.com] [link to images.google.com] A neutron star consist of neutrons, which in turn is built up by quarks. The quarks are confined in the neutrons. In a quark star the quarks are deconfined, that is they are free particles that are not confined in nucleons. In addition, quark stars also include the strange quark. [link to www.desy.de] |
Anonymous Coward User ID: 630722 Netherlands 03/20/2009 03:16 PM Report Abusive Post Report Copyright Violation | |
Anonymous Coward User ID: 630722 Netherlands 03/20/2009 03:25 PM Report Abusive Post Report Copyright Violation | [link to www.contracosta.cc.ca.us] [link to www.fcps.edu] [link to www.fcps.edu] The Pythagorean Spiral Project You will use compass constructions to create a poster of the Pythagorean spiral. The result needs to be colored and may be creatively decorated. [link to www.fcps.edu] You will need to turn in your poster and a separate piece of paper with all calculations. Materials: + poster board + ruler + compass + pencil, colored pencils or markers nibiruancouncil orbs [link to www.nibiruancouncil.com] The 3 Earth Grand Experiments [link to www.nibiruancouncil.com] |
"space time" User ID: 1173150 Netherlands 07/13/2011 11:07 AM Report Abusive Post Report Copyright Violation | Space-Time Cloak Possible, Could Make Events Disappear? Material would adjust speed of light to hide actions, physicists say. [link to images.nationalgeographic.com] Fiber optic cables (pictured) could help prove the theories behind the new "space time" cloak concept |
Anonymous Coward User ID: 1173150 Netherlands 07/13/2011 11:11 AM Report Abusive Post Report Copyright Violation | Material would adjust speed of light to hide actions, physicists say. Richard A. Lovett for National Geographic News Published July 11, 2011 [link to news.nationalgeographic.com] It's no illusion: Science has found a way to make not just objects but entire events disappear, experts say. According to new research by British physicists, it's theoretically possible to create a material that can hide an entire bank heist from human eyes and surveillance cameras. "The concepts are basically quite simple," said Paul Kinsler, a physicist at Imperial College London, who created the idea with colleagues Martin McCall and Alberto Favaro. Unlike invisibility cloaks—some of which have been made to work at very small scales—the event cloak would do more than bend light around an object. (Also see "Acoustic 'Invisibility' Cloaks Possible, Study Says.") Instead this cloak would use special materials filled with metallic arrays designed to adjust the speed of light passing through. In theory, the cloak would slow down light coming into the robbery scene while the safecracker is at work. When the robbery is complete, the process would be reversed, with the slowed light now racing to catch back up. If the "before" and "after" visions are seamlessly stitched together, there should be no visible trace that anything untoward has happened. One second there's a closed safe, and the next second the safe has been emptied. Event Cloak "Fun" but Challenging The concept of an event cloak "is definitely an interesting idea and great fun," said invisibility researcher Ulf Leonhardt, a physicist at the University of St. Andrews in the U.K. who wasn't part of the study team. Steve Cummer, a cloaking specialist at Duke University, calls the concept "interesting and exciting," but he thinks that actually making such a cloak would be "really, really challenging." "All of the material parameters need to be time-varying in a very specific way," Cummer said by email. Currently, nobody knows how to do that except in fiber optics, in which the speed of a signal can be varied by a few percent by changing the intensity of the light. (Related: "Nobel Prize in Physics Goes to 'Masters of Light.'") "You can use an intense control beam to slow a signal down," Kinsler said. In that way, an event occurring inside a fiber optic cable—such as an electrical signal moving from "on" to "off"—could be hidden from view. "You would see the fiber, but some event occurring in the fiber could be cloaked," he said. Such a proof of concept, he added, could be possible within a few years. (Related: "Long-Distance Quantum Message May Advance Code Making, Code Breaking.") Powerful Laser Key to Cloaking? There are still a few hitches to address, though, before attempting such an experiment, according to the University of St. Andrews's Leonhardt. For instance, being able to cloak an event lasting more than a few femtoseconds—one-millionth of a nanosecond—would require light from an immensely powerful laser, he said. "The experiment is not entirely impossible, but it is at the limit of what one can do with present technology in an ordinary university laboratory," Leonhardt said. (Related: "Fusion Power a Step Closer After Giant Laser Blast.") Study co-author Kinsler agrees that the fiber optics experiment is a technological stretch, but he counters that the problem can be eliminated by using a miles-long cable, as is routinely done in telecommunications. "You can reduce the required power by using a longer fiber," he said. That's because the duration of the event you can hide depends on how long you can delay the light. A longer cable would allow you to get a longer delay from the same percentage slowdown, which would take less power. Still, it may be a long while before police have anything to worry about—the materials needed for speeding and slowing light precisely enough for a bank heist have yet to be invented. The event-cloak story and an accompanying article by Leonhardt appear in a special issue of Physics World magazine published June 30. Comments (13) Oldest to Newest Newest to Oldest Most Recommended Most Active preet_kalsana 4:23 AM on July 13, 2011 While making a new discovery or Research, we Humans give more priority to what we can do unfortunately we give almost zero priority to what we shouldn't do. Reply . Recommend (1) Report Abuse . Mike Andrews 9:53 PM on July 12, 2011 A physicist is one who will eternally divide a resultant in half and think the end can never be reached. An engineer is one who, when close enough, simply reaches out and touches it. Cloaking looks nice on paper - wait for the engineer's verdict before investing in it though... Reply . Recommend (2) Report Abuse . zombieduck 7:11 PM on July 12, 2011 The writer of this article in an attempt to inject humor has made the process more sci-fi than it really is. I read an article a few months ago by a person who worked on the project and it explains the device in a more realistic fashion. I need to find it again, it is really interesting but not as sci-fi as being presented here. |
GeekOfTheWeek User ID: 1383040 United States 07/13/2011 11:14 AM Report Abusive Post Report Copyright Violation | Well it's a lot easier than that... Imagine this: LCD screens all over the object to hide. At the corners of these LCD screens you have cameras. Now add a server to place whats viewable on the camera, displayed onto the other side of the object onto the LCD screens... Wouldn't that be a lot easier? I love physics. It bonds us eternally, it's what makes our computers work, it's what's in my morning cup of coffee, it's the thing that keeps the universe from vanishing due to lack of belief... |