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(38,418 articles)
Popular News
Machine Vision System Inspects Displays Online
May 1, 1997 — Portable equipment such as mobile telephones, electronic organizers and handheld games has become widely available. Most of this equipment uses displays that have been custom made to suit each individual application.The requirements for inspecting these devices and displays seem simple: The system must reject displays that contain fewer or more display pixels than an ideal model. However, displays vary widely in presentation, contrast, brightness and illumination.An inspection system should be...
Appeals Court to Decide Telescope's Fate
May 1, 1997 — Apache Indians have asked the Ninth US Circuit Court of Appeals to stop the construction of the $60 million Large Binocular Telescope planned for Mount Graham in Arizona. University of Arizona officials had hoped to begin operating the first of two...
Micro-Aircraft Compete for Reconnaissance Roles
May 1, 1997 — Prototypes of eight micro-aircraft equipped with small engines, cameras and sensing equipment took part in the first Micro Aerial Vehicle competition on April 5 near the University of Florida in Gainesville. These micro air vehicles, each weighing...
NASA to Study Trees With Multibeam Laser
May 1, 1997 — NASA has approved a $59.8 million project to study the distribution of the Earth's forests using a multibeam laser. The study is part of NASA's ambitious Mission to Planet Earth, a multipronged plan to improve the accuracy of geophysical...
National Science Board Adopts New Funding Standards
May 1, 1997 — Flooded with nearly 30,000 proposals for funding every year, the National Science Board has adopted a new set of criteria to determine which research projects are most deserving of federal funds. Under the old system, the competence of the...
Report: Proposed Intellectual Property Laws Too Restrictive
May 1, 1997 — A recent report by the National Research Council says proposed changes to laws that protect intellectual property could impede the open exchange of scientific data among educators and scientists. In "Bits of Power: Issues in Global Access to...
Tyco Buys AT&T Undersea Unit
May 1, 1997 — In an effort to strengthen its hold on the undersea fiber optic cable market, Tyco International Ltd. agreed to purchase AT&T Submarine Systems Inc., a manufacturer of undersea fiber optic telecommunications cable. The purchase price was $850...
Amplifier Promises To Improve Charge-Coupled Devices
May 1, 1997 — LOS ALAMOS, N.M. -- A charge-coupled device (CCD), the component that converts light into electronic signals in scientific and commercial imaging instruments, is only as good as its amplifier. A new amplifier developed at Los Alamos National...
Laser-Chilled Atoms Sit for Ultrafast Portrait
May 1, 1997 — Physicists from the University of Michigan recently fired 70-fs pulses from a Ti:sapphire laser to control the random movements of atoms in a potassium-tantalite crystal. The laser was split in two beams, with one arriving at the crystal target a...
Spectroscopy Gauges Blast Potential
May 1, 1997 — ATLANTA -- When FBI agents rush into the hideouts of terrorist groups, they often find jars of chemicals that could be explosive. Some explosives are so dangerous that they would be downright deadly under even the gentlest of jostling, so carrying...
Don't Blink! Ultrafast Diffraction Captures Complex Phenomena
May 1, 1997 — PASADENA, Calif. -- Scientists at the California Institute of Technology have demonstrated a technique for producing light in femtosecond pulses, giving molecular chemists a peek at previously invisible chemical processes. Ahmed Zewail and his...
Infrared Camera Decloaks Invisible Flames
May 1, 1997 — A shoebox-size infrared camera could be a firefighter's most effective weapon in avoiding deadly invisible flames from hydrogen or alcohol fires. Engineers at NASA's John C. Stennis Space Center in Mississippi discovered that filters on...
Colorful Laser Aims at Inspection, Displays
May 1, 1997 — LOS ALAMOS, N.M. -- Laser displays and semiconductor inspection could be the future applications for a fiber-based solid-state laser that emits in the red, orange, green or blue.The discovery was, in large part, an accident. Timothy Gosnell and Ping...
Cryogenic Expansion Blurs Hubble Images
May 1, 1997 — Expanding nitrogen used to cool infrared detectors inside the Hubble Space Telescope's Near Infrared Camera and Multi-Object Spectrometer has caused one of the instrument's cameras to go out of focus. NASA scientists detected the foul-up shortly...
Diode Lasers Are at the Heart of Cardiac Monitoring System
May 1, 1997 — CAMBRIDGE, Mass. -- Since 1970, doctors have injected patients with iced saline to measure their hearts' blood output. Periodic injections provide reliable results but do not allow doctors to constantly monitor patients.An infrared irradiating...
Multibeam Technique Improves Eye Surgery, Machining
May 1, 1997 — WERMELSKIRCHEN, Germany -- Many excimer laser beams are better than just one, at least for laser eye surgery and for precise laser machining, according to the scientists who developed a new excimer laser technique.Surgeons can correct many vision...
Sapphire Could Become Interferometry's Crowning Jewel
May 1, 1997 — NEDLANDS, Australia -- The gemology community considers sapphire to be one of the most precious stones on Earth, and researchers believe that the blue crystals' use as beamsplitters in laser interferometer gravitational wave detectors could be just...
Lab Wants to Slap Enemies Senseless
May 1, 1997 — LOS ALAMOS, N.M. -- Some folks think that the US military's vast stockpile of so-called antiquated weapons should be destined for the trash bin, when all they really need is a good slap. Scientists at Los Alamos National Laboratory are developing a...
Laser Machines Microthrusters
May 1, 1997 — LOS ANGELES -- As part of a program to create a mass-producible nanosatellite, scientists at the Aerospace Corp. are developing batch material processing techniques that use UV lasers to create complicated 3-D micro- and mesoscale structures in...
Silver 'Mirrors' Reflect Single Molecule's Wild Dance
May 1, 1997 — Researchers at the Massachusetts Institute of Technology have discovered a way to identify the structure of a single molecule, knowledge that could prove invaluable for biomedical applications such as human gene analysis. The method,...
Frequency-Doubled Red Diode Laser Produces Ultraviolet Light Efficiently
May 1, 1997 — Japanese researchers have taken another step toward a compact ultraviolet light source that has great potential in high-density optical storage and biomedical applications. Scientists at Matsushita Electric Industrial Co.'s Development Center in...
Conference Highlights Medical, Entertainment Laser Safety
May 1, 1997 — ORLANDO, Fla. -- A better understanding of the hazards of the surgical laser plume, real-time videos of retinal laser lesions in live animal's eyes and an in-depth examination of endotracheal laser accidents were among the highlights of the Third...
Ti:sapphire Laser Amplifier Produces 5 W Average Power
May 1, 1997 — Scientists from Quantronix Corp. and the City University of New York's Center for Advanced Technology have developed a femtosecond Ti:sapphire laser amplifier system that generates an average power output of 5 W. The Titan comprises a regenerative...
Aluminum-Free Diodes Offer Doubled Power Potential
Apr 1, 1997 — Researchers at the University of Wisconsin-Madison and Coherent Inc. have produced diode lasers with aluminum-free active areas, which they expect will operate more reliably than AlGaAs-active diodes and will provide roughly twice the power. Writing...
Photonics Eyed To Cut Light Bills
Apr 1, 1997 — OAK RIDGE, Tenn. -- Using collectors to gather sunlight and optical waveguides to transport the light, researchers at the US Department of Energy's Oak Ridge National Laboratory have put together the first pieces of a hybrid lighting system that...
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