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(38,284 articles)
Popular News
Integrating Sphere Tests Efficiency
Nov 1, 1998 — As building developers struggle to incorporate energy conservation into their designs, controlling heat and light fluxes through windows is crucial. As the "intelligent window" becomes more complex, so does the objective assessment of its overall optical properties. Straightforward spectrophotometric measurement of absorption becomes difficult. The researchers' facility for measuring the optical properties of windows incorporates a large integrating sphere. Courtesy of Labsphere Inc. "The...
Subaru Telescope Gets 27-ft Mirror
Nov 1, 1998 — A team of opticians has completed a one-piece, 27-ft-diameter mirror that soon will be incorporated into the Subaru Telescope, which is under construction at the summit of Mauna Kea in Hawaii. Led by Scott Smith of Contraves Brashear Systems of...
Material Enables Energy-Efficient Window
Nov 1, 1998 — Researchers at the University of California and Lawrence Berkeley National Laboratory have discovered an inexpensive material that could lead to highly efficient windows for automobiles and buildings. Robert Kostecki and Frank McLarnon made the...
Lens Array Increases Photodetection Efficiency
Oct 1, 1998 — A two-lens array developed by physicists contributing to the HERA-B detector facility at the Deutsches Elektronen-Synchrotron facility shows that some of the most advanced experimentation in pure physics can produce very simple and practical...
Lenses Boost Solar Cells' Power
Oct 1, 1998 — Two solar concentrator arrays will supply Deep Space 1's power-hungry propulsion system with more than 2 kW at the beginning of the mission. The solar concentrator arrays with refractive linear element technology allow a relatively small area of...
Low-Cost Quantum Cascade Laser Nears Reality
Oct 1, 1998 — A team of researchers has designed a quantum cascade laser using one of the most common low-cost semiconductor compounds in the world: gallium arsenide (GaAs). The advance could prove important in sensing applications requiring mid-IR wavelengths...
Tiny Transistors Fit on New Chip
Oct 1, 1998 — Researchers at Texas Instruments in Dallas have developed transistors with a channel length of 0.07 µm -- so small that 400 million can fit on a single chip. The new technology could draw interest from some imaging board manufacturers,...
Kopin and Motorola Sponsor Design Contest
Oct 1, 1998 — Kopin Corp. of Taunton, Mass., and Motorola Inc., based in Hong Kong, have issued a challenge to engineers, designers and students: Design a portable commercial product that incorporates Kopin's active-matrix liquid crystal display and Motorola's...
Device Detects Particles in Gas Flow
Oct 1, 1998 — The combination of a laser and time-of-flight mass spectrometry promises to enable semiconductor manufacturers to measure the size and type of individual particles in a vacuum chamber during the manufacturing process. Researchers at Lucent...
Holographic Storage Takes a Step Toward Viability
Oct 1, 1998 — If holographic storage is ever going to make it out of the lab and really compete with existing data storage techniques, researchers must come up with practical, cost-effective solutions to some of the hurdles holography still faces. One such hurdle...
Mirror Enables 3-D Lithography
Oct 1, 1998 — Ball Semiconductor Inc. has set its sights on revolutionizing the computer-chip industry by manufacturing a spherical chip. To accomplish this, it has incorporated a multifaceted mirror into its proprietary lithography system. The process used...
Eye-on-a-Chip Seeks to Mimic Human Vision
Oct 1, 1998 — Scientists are looking to improve on one of nature's wonders -- the human eye. Researchers at the University of Michigan are leading a multiuniversity effort to design a microchip eye that could mimic many of the natural eye's functions but also...
Integrated Components Trim NASA Budgets
Oct 1, 1998 — Space exploration at the beginning of the next century will balance tight budgetary constraints against the need to understand our planetary environment. New technologies introduced in NASA's New Millennium program are designed to ensure that more...
New Option Emerges for Optical Networks
Oct 1, 1998 — For the past few years, the news in telecommunications circles has been wavelength division multiplexing. Now Commercial Technologies Corp. in Richardson, Texas, hopes to add a new catchphrase to the industry lexicon: code division multiple access....
Our Bodies, Our Photons
Oct 1, 1998 — The thermal effects of microwave radiation on living tissue are well-documented and strictly regulated. However, researchers are drawing attention to the fact that microwave radiation, even in extremely low doses, induces nonthermal influences whose...
Scientists Fabricate Plastics with Nonlinear Properties
Oct 1, 1998 — Although researchers have successfully designed optical-quality plastics, the nonlinear optical properties of plastic tend to fade over time. Therefore, many researchers have dismissed plastics as impractical for use in fiber optic devices and light...
Lasers Are Used to Screen Solid-State Catalysts
Oct 1, 1998 — Scientists looking for solid-state catalysts that are important to the chemical and oil industries have relied on trial-and-error processes because catalytic activity is difficult to screen. Unlike superconductivity or magnetoresistivity, properties...
Feds Postpone Laser Safety Tests
Oct 1, 1998 — The delayed delivery of a laser has held up evaluations of the US Federal Aviation Administration's guidelines for laser exposure within 10 nautical miles of an airport. The tests, which were scheduled to begin earlier this year at the agency's Mike...
Luminous-Intensity Standard Set for Traffic Lights
Oct 1, 1998 — The International Commission on Illumination in Vienna, Austria, recently reviewed requirements for the luminous intensity of road traffic signals. It undertook a major review of its recommendations published in 1988 in A Guide for the Design of...
Scientists Unveil High-Power Mid-IR Laser
Oct 1, 1998 — Commercially available lasers based on semiconductor compounds such as PbSn have proved suitable for applications requiring wavelengths in the mid-IR range. The only problem with these lasers is that the maximum power is often less than 1 mW. In the...
Researchers Advance VCSEL Technology
Oct 1, 1998 — In the quest to develop long-wavelength vertical cavity surface-emitting lasers (VCSELs), scientists have faced two large barriers: temperature performance and operating voltage. W.L. Gore & Associates, based in Newark, Del., may have solved...
BrainTech and UTMC to Develop Vision Recognition Board
Oct 1, 1998 — BrainTech Inc., based in Vancouver, British Columbia, Canada, and UTMC Microelectronic Systems Inc., a business unit of Hamilton Standard, have agreed to develop and manufacture a visual recognition accelerator board for use in the vision systems...
Fiber Increases Bandwidth in WDM Amplifiers
Oct 1, 1998 — There has been one major problem with conventional erbium-doped fiber optic amplifiers. Because of certain characteristics of erbium-doped fiber, dense wavelength division multiplexing (WDM) systems use only 32 nm of usable bandwidth. In the 1550-nm...
Researchers Reveal High-Resolution Images of Black Hole
Oct 1, 1998 — Scientists may be a little closer to understanding black holes, thanks in part to an imaging technique called IR speckle interferometry. Pioneered by Andrea Ghez of the University of California in Los Angeles, the technique involves using computers...
Telecom Consortium Signs $1.5 Billion Cable Project
Oct 1, 1998 — More than 50 telecom companies signed a contract to provide a fiber optic cable link between Europe and the US for $1.5 billion. The link will help decrease waiting time on the World Wide Web. The TAT-14 cable will have a 640-Gb capacity, about 80...
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