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Research & Technology News

Quantum Dots Optically Code Biomolecules
BLOOMINGTON, Ind. -- Chemists at Indiana University have taught quantum dots to fear water. And that's a good thing. For the past three years, several research groups have developed these nanometer-scale, semiconductor-based crystals as a potential alternative to the organic dyes used as tags in biological assays. Unlike quantum dots, dyes can be toxic and more prone to photobleaching, and require multiple light sources to fluoresce multiple dyes. Most quantum dots developed in the past were water-soluble...
Quantum-Dot Lasers Produce >5 mW
Oct 1, 2001 — Researchers at Universitat Wurzburg in Germany have demonstrated InAs/GaInAs quantum-dot lasers that produce more than 5 mW of 1.3-µm light at room temperature. The lasers, which exhibited threshold currents of 6 mA, display continuous-wave...
Screen Printing Creates LED Display
ERLANGEN, Germany -- Organic LED displays offer better contrast, wider viewing angles and lower power consumption than liquid crystal screens. Their drawback, however -- particularly for those based on conjugated polymers -- is that they are manufactured by the...
Single-Photon Detector Flashes Faster
ROCHESTER, N.Y. -- Photodetectors typically require high gain to respond to the energy of a single photon, but gain mechanisms take time to reset between photon events and thus limit the detector bandwidth to approximately 10 MHz. High gain also makes single-photon...
Smart Sweeper Sorts Trash with Laser Light
GUILDFORD, UK -- The next time a street sweeper finishes its run, take a look at the litter it left behind for another pass. The problem is that drivers must not only navigate the truck, but also simultaneously control the brushes to apply the optimal force for the...
Solar Plane Sets Altitude Record
Oct 1, 2001 — Helios, a solar-powered aircraft developed by NASA's Dryden Flight Research Center in Edwards, Calif., and AeroVironment Inc. of Monrovia, Calif., has broken the world record for altitude of a nonrocket-powered aircraft, reaching more than 96,500...
Solid Electrolysis Offers <50-nm Near-Field Probes
Oct 1, 2001 — A team of researchers from the University of Basel in Switzerland and from Karl-Franzens University in Graz, Austria, has produced aperture probes for near-field optical microscopy using controlled all-solid-state electrolysis. The technique, which...
UV Water Treatment for NYC?
NEW YORK -- To ensure the quality of the nation's drinking water, the Environmental Protection Agency is enforcing increasingly strict treatment regulations. In the case of New York City's water supply, this could mean a filtration plant in the upstate...
Air Force Satellite Launched
Sep 1, 2001 — The US Air Force has launched the 21st Defense Support Program reconnaissance satellite aboard a Titan IV rocket. The satellites, which were first put into service in the early 197...
Another Setback for Solar Sail
Sep 1, 2001 — First an explosion postponed the test of the Cosmos 1 solar sail (see June issue, page 51). Then the rescheduled flight was delayed by the salvage effort for the ill-fated Kursk su...
Antimissile Makes Its Mark
Sep 1, 2001 — The second system-level integrated flight test of the US Ground-based Midcourse Defense Segment (formerly National Missile Defense) program’s kinetic antimissile system came off wi...
CO2 Best for New Interior Panels
VIGO, Spain -- VIGO, Spain -- Automobile manufacturers constantly seek to improve their product’s marketability, performance and profitability. One innovation is the replacement of standard inter...
Compound-Cavity Diodes Promise T-Rays
GLASGOW, UK -- GLASGOW, UK -- The last few decades have been marked by the rapid opening of the high-frequency electromagnetic spectrum for communications, detection and imaging. Remarkably quiet...
Deformable Mirror Tests Adaptive Optics
CHARLOTTE, N.C. -- CHARLOTTE, N.C. -- The advent of adaptive optics systems, which correct for the aberration caused by atmospheric turbulence, has dramatically improved the resolution of ground-base...
Doubled Diode Offers Blue Output
ST. ANDREWS, UK -- ST. ANDREWS, UK -- Research on semiconductor lasers in recent years has focused on making them small and making them blue. Compact blue lasers can provide diffraction-limited spots...
Explaining Why Oil and Water Don’t Mix
EUGENE, Ore. -- EUGENE, Ore. -- It’s a principle most seventh-graders know: Oil and water don’t mix. Of course, there is more to the story. They do interact at some level; for example, oil spreads...
Fluorescent Molecules Detect Metals
Sep 1, 2001 — A research team at Brigham Young University in Provo, Utah, has synthesized a molecular sensor that reveals the presence of zinc in water. The work, which appeared in the July 13 i...
Image Processing Aids Art Restoration
SANTA BARBARA, Calif. -- SANTA BARBARA, Calif. -- On Sept. 26, 1997, a magnitude 6.0 earthquake in the Umbrian and Marches provinces of central Italy brought the Cimabue and Giotto frescoes in the Basilica...
Laser Enables Precision Arc Welding
COLUMBUS, Ohio -- COLUMBUS, Ohio -- Welding is big business. Approximately $2 billion and $600 million are spent annually on arc welding and laser welding equipment, respectively. Now researchers at...
Laser Uncovers Cracks in Lumber
JOENSUU, Finland -- JOENSUU, Finland -- When wood is dried, its surface layer sometimes shrinks, causing internal stresses that can develop into tiny cracks. And these cracks, invisible to the naked e...
Light Is Key to Quantum Computing
SANTA BARBARA, Calif. -- SANTA BARBARA, Calif. -- Researchers at the University of California and Pennsylvania State University in University Park have discovered that taking a light touch may be the right...
Light Obscures the Night Worldwide
Sep 1, 2001 — Light pollution is a global problem, according to the results of a study conducted by researchers from the National Oceanic and Atmospheric Administration’s National Geophysical Da...
Micromirrors Improve Detectors
DALLAS -- DALLAS -- Researchers at Southern Methodist University have proposed a design for better infrared detectors. The micromachined devices promise to measure the actual temperature of ...
Microspheres Identify Odors
MEDFORD, Mass. -- MEDFORD, Mass. -- For anyone who has trouble telling when the milk has gone bad, help may be on the way, thanks to an artificial nose that is under development at Tufts University ...
Mirror Deemed Playground Hazard
Sep 1, 2001 — Accidents on the playground typically involve hard surfaces, lead paint and sharp edges. A plastic dome from Kompan Inc. of Olympia, Wash., a subsidiary of Kompan A/S of Ringe, Den...

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