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(38,311 articles)
Popular News
Single-Pixel Sensor Revs Up Mirrors
Dec 1, 2001 — Gentex makes about 7 million auto-dimming mirrors each year for major auto manufacturers. Despite these impressive numbers, the company is always looking for "major improvement in system cost and manufacturing," said Joe Stam, the company's lead engineer for imaging products. In an industry where gas tank caps and plastic reflectors are negotiated to the nearest penny, contractors must keep a close eye on their budgets. Auto-dimming rearview mirrors use sensors to determine when another...
'Guide Star' Enables Sodium Measurements
Dec 1, 2001 — Researchers at Imperial College in London are employing adaptive optics technology to measure sodium in the atmosphere with the 1-m Kapteyn Telescope at La Palma Observatory in the Canary Islands. The continuous-wave output of a 275-mW,...
Mobile System Features Three Mass Spectrometry Techniques
Dec 1, 2001 — There are few chemical species that cannot be identified through one or another of mass spectrometry's myriad forms. However, chemists must select which spectrometric method best applies, based on the targeted species and the method of sample...
Machine Vision Has Eyes for Foul Fowl
Dec 1, 2001 — With the rising concern over cholesterol, the demand for chicken now outpaces the demand for beef in the American diet. Pressured to keep pace, the poultry industry automated many of its processing techniques by the late 1970s. Inspection, however,...
Engineering Emmys Presented
Dec 1, 2001 — The National Academy of Television Arts and Sciences of New York recognized scientific accomplishments in the television industry at a ceremony Oct. 16, awarding 25 Emmys for Outstanding Achievement in Engineering Development. Photonics and related...
Lidar Demonstrates Feature Discrimination
Dec 1, 2001 — Scientists use remote-sensing techniques to characterize landform variation, to evaluate the health of vegetation and to measure the temperature of the oceans. But while in the visible to the infrared offers valuable information, the ambient light...
Spectra Determine Fruit Ripeness
Dec 1, 2001 — If you have ever bought the "perfect" piece of fruit from the grocery store only to have it rot the next day, you know how tough it can be to find fruit that is ripe enough to eat -- but not overripe. Research being conducted at the University of...
FTIR Spectroscopy Detects Biohazards
Dec 1, 2001 — With the recent anthrax attacks in the US, finding a means of detecting airborne biological agents from a safe distance has become all the more important. Fourier transform infrared (FTIR) spectroscopy may be a solution, suggests a new study. A...
Researchers Demonstrate Macroscopic Entanglement
Dec 1, 2001 — With one experiment, researchers have heartened Star Trek fans and quantum computing enthusiasts. A team at the University of Aarhus' Quantum Optics Center in Denmark has demonstrated quantum entanglement involving trillions of atoms over a distance...
Multispectral Imaging Monitors Coral
Dec 1, 2001 — A study appearing in the Sept. 6 issue of Nature concludes that airborne multispectral imaging may be a powerful tool for monitoring the health of coral reefs. Researchers on the project from Newcastle upon Tyne University and Sheffield University,...
Light-Reactive Coating Cleans Surfaces
Dec 1, 2001 — If you shine ultraviolet light on a surface coated with titanium dioxide, a common white pigment in paint, it self-sterilizes and defogs. Until now, however, if you used visible light, only approximately 5 percent of which is in the UV region, it...
Recordable CDs Are Source of Gold Substrates
Dec 1, 2001 — Hua-Zhong Yu isn't burning mixes of MP3s from Napster with his stacks of recordable CDs. An assistant professor in the department of chemistry at Simon Fraser University in Burnaby, British Columbia, Canada, Yu is investigating recordable CDs as a...
Optical Digital Signal Processor Boosts Speeds
Dec 1, 2001 — A new approach to signal processing promises to reduce bottlenecks in telecommunications networks. Lenslet Labs Ltd. of Ramat-Gan, Israel, has developed an optical digital signal processor that operates thousands of times faster than today's...
Bolometer Array Suitable for 350-µm Astronomy
Dec 1, 2001 — Researchers at the Jet Propulsion Laboratory and California Institute of Technology in Pasadena, Lawrence Berkeley National Laboratory in Berkeley, Calif., University of Colorado in Boulder and Cardiff University in the UK have developed a micromesh...
Nd:YAG Produces 53-mJ Green Light
Dec 1, 2001 — It may not be easy being green, but researchers at Mitsubishi Electric Corp.'s Advanced Technology R&D Center based in Amagasaki, Japan, have made the most of it. They have produced 53 mJ from a diode-pumped, intracavity frequency-doubled Nd:YAG...
Xenon Source Offers Hemispheric Emission
Dec 1, 2001 — A team at the University of Central Florida in Orlando has demonstrated a differential-pumping scheme for a xenon capillary-discharge plasma source that enables the device to produce 11.3- and 13.5-nm light in a full hemisphere. The previous...
Unmanned Vehicles Fly by Light
Dec 1, 2001 — By exploiting quantum mechanics, researchers at the Naval Research Laboratory in Washington have used free-space optics to communicate with unmanned aerial vehicles. The technique promises to allow data transfer and the control of fist-size fliers...
Ultrafast Setup Machines and Measures
Dec 1, 2001 — Researchers at the University of Aarhus in Denmark have developed laser techniques for manufacturing and measuring on the microscopic scale. The method uses the same femtosecond laser pulses to ablate material and to profile depths on the...
Quantum-Dot Detector Spots Submillimeter-Wave Photons
Dec 1, 2001 — Doubling up can single out photons. A new submillimeter-wave detector promises the sensitivity to spot single photons. In contrast to existing single-photon-detection schemes, the detector does not require a magnetic field, and it offers an expanded...
Simple Bulk Optic Offers Simple Beam Control
Dec 1, 2001 — Bulk solid optics have helped circumvent the need to align multiple free-space optics within communications systems by substituting multiple mountings of discrete optical components with a single integrated optical unit. The same goal spurred...
AlGaN/GaN Deposited on Silicon
Dec 1, 2001 — Aixtron AG of Aachen, Germany, has announced that a research group has deposited III-V semiconductors on silicon wafers using the company's low-pressure metallorganic chemical vapor deposition system. The ability to deposit compound semiconductors...
Laser Spectroscopy Refines Antiparticle Measurement
Dec 1, 2001 — The existence of the antiproton was predicted in 1930 and confirmed experimentally in 1955. These particles, however, can be produced only in high-energy accelerators, and their short lifetime prevents a detailed examination. By studying how...
Plasma Displays 0.12% Conversion Efficiency
Dec 1, 2001 — Laser-induced plasmas have emerged as potential sources of soft x-rays and extreme-UV light for applications in spectroscopy, microscopy and lithography. Now researchers at Max Born Institute for Nonlinear Optics and Spectroscopy in Berlin and at...
Photoinduced Reflectivity Creates Near-Field Probes
Dec 1, 2001 — Transient-aperture probes generated with light promise high resolutions and near-video rates for near-field infrared microscopy. The technique, under development at the W.W. Hansen Experimental Physics Laboratory at Stanford University in Stanford,...
Optical System Enables 2-D Scanning
Dec 1, 2001 — In pursuit of new e-book technology, researchers have designed a novel optical system that scans in two dimensions. Although developed for a display in a portable document reader, the designers say that the lens system can be used for any...
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