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thinkahol *

First 'living' laser made from kidney cell - physics-math - 12 June 2011 - New Scientist - 0 views

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    It's not quite Cyclops, the sci-fi superhero from the X-Men franchise whose eyes produce destructive blasts of light, but for the first time a laser has been created using a biological cell. The human kidney cell that was used to make the laser survived the experience. In future such "living lasers" might be created inside live animals, which could potentially allow internal tissues to be imaged in unprecedented detail. It's not the first unconventional laser. Other attempts include lasers made of Jell-O and powered by nuclear reactors (see box below). But how do you go about giving a living cell this bizarre ability? Typically, a laser consists of two mirrors on either side of a gain medium - a material whose structural properties allow it to amplify light. A source of energy such as a flash tube or electrical discharge excites the atoms in the gain medium, releasing photons. Normally, these would shoot out in random directions, as in the broad beam of a flashlight, but a laser uses mirrors on either end of the gain medium to create a directed beam. As photons bounce back and forth between the mirrors, repeatedly passing through the gain medium, they stimulate other atoms to release photons of exactly the same wavelength, phase and direction. Eventually, a concentrated single-frequency beam of light erupts through one of the mirrors as laser light.
Skeptical Debunker

Carbon Nanotube Speakers Could Be Powered by Lasers, Transform Noisy Spaces into Peacef... - 6 views

  • “Nanotubes assemblies of various types are black and highly conductive,” said Dr. Mikhail Kozlov, a research scientist and the study’s lead author. “Their dark, conductive surface can be effectively heated with laser light or electricity to induce variations in the pressure of the air around the nanotubes — which we perceive as sound. It’s called the photo- or thermo-acoustic effect, and it’s the same principle Alexander Graham Bell used to produce sound on the first telephone.” With laser excitation, no electrical contact with the nanotube speaker is required, making the speakers wireless. “Speakers made with carbon nanotube sheets are extremely thin, light and almost transparent,” Kozlov said. “They have no moving parts and can be attached to any surface, which makes the surface acoustically active. They can be concealed in television and computer screens, apartment walls, or in the windows of buildings and cars. The almost invisible strands form films that can ‘talk.’” In addition to filling a room with sound from invisible speakers, nanotube speakers could easily cancel sound from the noisiest neighbor or dim the roar of traffic rushing past a neighborhood, using the same principles as current sound-canceling technologies. “The sound generation by nanotube sheets can help to achieve this effect on very large scales,” Kozlov said.
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    A UT Dallas team's study published in the Journal of Applied Physics expands the extraordinary capabilities of nanotechnology to include laser-powered acoustic speakers made from assemblies of carbon nanotubes.
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    Amazing work being done with nanotechnology!
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    http://www.nlptrainingcoaching.com Neuro Linguistic Programming (NLP) Neuro Linguistic Programming (NLP) is the most proven and systematic way to understand, how your subconscious is presently programed for current level of success.
Mark Williams

Germanium Lasers Are Possible, Important Element of Future Photonic Computers - 0 views

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    Swiss researchers have reportedly managed to make germanium suitable for lasers, which is important to eventually enable microprocessor components to communicate using light that is 10 times faster than electric currents, essentially becoming much faster photonic computers.
Mark Williams

Future Laser Tech on the Front Lines of Archaeology - 0 views

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    James Newhard is Director of Archaeology at the College of Charleston, where he works to bring 3D imaging, mobile technology and geographic information systems to a field more popularly associated with shovels and dusty brushes. Gizmodo got in touch with Dr. Newhard to learn how he uses emerging tech to dig deep into ancient societies.
thinkahol *

Theoretical breakthrough: Generating matter and antimatter from the vacuum | KurzweilAI - 0 views

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    Under just the right conditions-which involve an ultra-high-intensity laser beam and a two-mile-long particle accelerator-it could be possible to create something out of nothing, according to University of Michigan researchers.
thinkahol *

Undersea cauldrons replicated life's ingredients - life - 27 May 2010 - New Scientist - 0 views

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    "THE precursor of life may have learned how to copy itself thanks to simple convection at the bottom of the ocean. Lab experiments reveal how DNA replication could have occurred in tiny pores around undersea vents." "To test this theory, Mast and Braun put these ingredients into tubes 1.5 millimetres long. They used a laser to heat one side of the water and create thermal convection. Sure enough, they found that the DNA doubled every 50 seconds (Physical Review Letters, vol 104, p 188102)."
thinkahol *

Quantum trickery could lead to stealth radar - tech - 31 March 2011 - New Scientist - 1 views

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    Traditional methods of transmitting data, such as fibre optics or laser-based radar, require roughly 100 photons to transmit a single bit of data. Now a team led by Saikat Guha at Raytheon BBN Technologies in Cambridge, Massachusetts, say they can transmit 10 bits on a single photon - a 1000-fold improvement.
susanbelly

How Fiber Optics Work? - 2 views

To understand how fiber optic cables work, imagine an infinitely long drinking straw or flexible plastic tube. For example, imagine a pipeline that is several kilometers long. Now, suppose the inne...

Science research TECHNOLOGY

started by susanbelly on 10 Mar 22 no follow-up yet
Walid Damouny

Carbon nanotubes show the ability to amplify light, could lead to new photonic applicat... - 0 views

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    "(PhysOrg.com) -- "Carbon nanotubes have a lot of really nice properties that make them good for photonics," Laurent Vivien tells PhysOrg.com. Ever since the discovery that carbon nanotubes have photoluminescence when encapsulated in micelle surfactant, Vivien points out, there has been interest in pursuing them for use in nanophotonics, and in microelectronics. "
Barry mahfood

Grassroots Nanotech: Controlled Self-Assembly - 0 views

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    Throughout our history, mankind has created tools the same way, essentially using the top-down approach. Think about it. In the stone age, a sharp cutting tool was fashioned by using a larger stone to chip away pieces until the cutting stone was sharp enough. Today, a computer chip is made by a large laser that etches the circuits into a piece of silicon.
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