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(38,284 articles)
Popular News
People Finder Flounders Under Testing
Jul 1, 1998 — Finding the survivors among the wreckage of a bombing or plane crash is difficult at best, so when the US government learned about a new device from DielectroKinetic Laboratories LLC of Washington, they were eager to put it to the test. What they discovered, however, was that the LifeGuard -- a virtual divining rod for human detection -- performed no better than random chance. According to company literature, the instrument operates on the principle of dielectrophoresis: It points toward a...
Lucent Makes Gains in Network Technologies
Jul 1, 1998 — Lucent Technologies has unveiled two types of optical fiber: one that promises increased bandwidth for local networks and another that features low dispersion for long-distance systems. For metropolitan networks, the company developed AllWave, which...
Giant Telescope to Map Vast Expanse of Sky
Jul 1, 1998 — Astronomers have been able -- even with the greatest of telescopes -- to see only a small portion of the sky at a time. Professor Jim Gunn, a Princeton University astronomer, hopes to overcome this obstacle by building a telescope that images the...
Lasers Create Nanoscale Islands
Jul 1, 1998 — The creation of nanodots, or small islands of a few atoms, offers significant interest to semiconductor laser manufacturers. Compared with quantum well designs, the smaller structures provide electron carrier confinement with increased output...
Physicists Propose Novel Method to Catch Neutrinos
Jul 1, 1998 — For years, scientists have sought the elusive, weightless particles known as neutrinos. Neutrinos, which behave somewhat like photons (they can travel without changing direction through matter), are weakly interacting particles and so can travel...
Fluorescence Finds Photomask Defects
Jul 1, 1998 — Using a fluorescent dye and an argon-ion laser, researchers at the University of Delaware can detect nanometer-size scratches in the polished surface of a photomask much more quickly than with atomic force microscopy. Researchers use a...
Plastic Fiber Technique Improves Cost
Jul 1, 1998 — A Florida company has developed and patented a method for the continuous production of graded-index plastic optical fiber. James K. Walker, CEO of Nanoptics Inc. in Gainesville, Fla., presented an overview of the method at the Plastic Optical Fiber...
LEDs Put Railroad Lighting on More Efficient Track
Jul 1, 1998 — Using light-emitting diodes (LEDs) to replace colored tungsten filament bulbs for their signals could help railway companies cut costs and reduce risks for maintenance crews. LED signals developed by Costas Tsakonas (left) and George Bearfield...
NASA Scientists Report Insights into Rainfall
Jul 1, 1998 — Thanks to recently released images taken from a NASA/ Japan Space Agency spacecraft's lightning image sensor, scientists are gaining new insights into rainfall-producing cloud systems over the tropics. Sensors aboard a NASA satellite captured...
Devices Detect Explosive Residue
Jul 1, 1998 — To evolve low-cost, portable land mine detection technology, researchers at Duke University have developed microelectromechanical devices that could become a two-part detection system for explosives. The first device uses ultrasound to loosen the...
Researchers Shrink Confocal Laser Microscope
Jul 1, 1998 — Scanning confocal laser microscopes are bulky and stay in one place. But a start-up company aims to find its success by miniaturizing these devices while still providing three-dimensional optical sectioning and high contrast. The battery-operated...
Solitons Work in Real Network
Jul 1, 1998 — The increasing demand for bandwidth in optical links has found an answer in nonlinear propagation, which recently was put into play by Pirelli Cables and Systems and MCI Telecommunications Corp. This method increased the system's capacity,...
Researchers Make Gains in Understanding Human Thought
Jul 1, 1998 — Researchers at Stanford University have taken an important step in understanding the chemistry behind the way cells in the brain communicate with one another. Chemists used a laser to trap microscopic membranes in the brain of a sea slug. These...
TRW's UV Laser to Advance Photolithography
Jul 1, 1998 — TRW's Space and Technology Div. in Redondo Beach, Calif., has taken another step closer in the development of a light source for lithography for the semiconductor industry. TRW selected SDL Inc. in San Jose, Calif., as the initial supplier of...
Engineers Unveil Tabletop X-Ray Laser
Jul 1, 1998 — Researchers at the University of Michigan's Center for Ultrafast Optical Sciences in Ann Arbor have built a tabletop laser that generates a coherent x-ray beam. The scientists shot a rapidly pulsing laser through a hollow glass tube filled with gas....
Scientists Find Nine-Atom Silicon Cluster
Jun 1, 1998 — Researchers have discovered a silicon cluster larger than four atoms. The team, comprising scientists from the University of Notre Dame in Indiana, may lead to a silicon nanoparticle solution that could have valuable optical properties. This...
Coating Method Makes Molecule-Thick Layers
Jun 1, 1998 — A method for dip coating a substrate with organic polymers may increase the efficiency of light-emitting diodes (LEDs) and computer displays while reducing costs and environmental hazards. The technique, being explored by a group of MIT researchers,...
Interferometer Detects Microscopic Flaws on Optical Surfaces
Jun 1, 1998 — A team of scientists at Lawrence Livermore National Laboratory in Livermore, Calif., has developed an absolute interferometer that can detect imperfections less than 1-nm deep in highly polished surfaces, such as lenses or mirrors. The device could...
Diode Pumps New Self-Frequency-Doubled Laser
Jun 1, 1998 — In an intensive three-week push, researchers from the Center for Research and Education in Optics and Lasers at the University of Central Florida in Orlando cranked up the power of their diode-pumped, self-frequency- doubled Nd:YCOB laser. Using a...
Multispectral Imager Enhances Remote Sensing
Jun 1, 1998 — Scientists at NASA's John C. Stennis Space Center in Mississippi have developed a portable multispectral imaging device operating in a range of user-selectable bands. The imager produces multiple video images of the same scene at spectral bands...
Scientists Evaluate Statues, Cathedrals with Laser Radar
Jun 1, 1998 — A research group here has collaborated with an Italian team to evaluate the integrity of ancient monuments and historical structures using laser radar that was originally designed for atmospheric sensing. The problem of decaying artifacts is nothing...
Facial Recognition System Verifies Driver's Identity
Jun 1, 1998 — A computerized facial recognition system, employing advanced algorithms coupled with off-the-shelf imaging equipment, has given this state's motor vehicles division an advantage in determining a license applicant's identity. Not long ago, there were...
Phoenix Finds the Flames
Jun 1, 1998 — A team of engineering students from Trinity College in Hartford, Conn., took the No. 1 prize in an international contest to build a computerized robotic device that detects fire. The robot, dubbed Phoenix, employed IR sensors for edge and heat...
Researchers Unveil Metal-Free Cathodes for LEDs, Photodetectors
Jun 1, 1998 — Scientists at Princeton University in New Jersey have developed a class of metal-free cathodes for use in organic light-emitting diodes (LEDs) along with phototransistors, photodetectors, solar cells and lasers. Typically, organic LEDs employ a more...
Astronauts Go for a Spin
Jun 1, 1998 — Astronauts aboard the space shuttle Columbia had their heads spinning, literally. As part of a series of space-based neurological experiments, they took turns in a spinning chair while IR video cameras tracked their eye movements. NASA researchers...
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