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(38,313 articles)
Popular News
NIH Awards Grant for Ophthalmic Instrument
Feb 1, 2002 — Aborn Eye Research Center and Opticology Inc., both of New York, have received a Phase I Small Business Technology Transfer grant from the National Eye Institute of the National Institutes of Health (NIH) to further develop an ophthalmic device for measuring centrally located pathological areas of nonvision on the retina. With a combination of software and optical hardware, patients suffering from macular degeneration and other retinal defects can maintain fixation. The technique promises...
Radiation-Hardened Cameras Aid in Nuclear Generator Refueling
Feb 1, 2002 — During a refuel outage of a nuclear power plant, all of the fuel assemblies in the reactor core are either replaced or moved to other locations in the core. Each of these fuel assembly moves, which may number more than 1000, must be verified by...
Spectroscopy Technique Reveals Strange Chemistry of a Frozen World
Feb 1, 2002 — Recent data from the Near Infrared Mapping Spectrometer aboard the Galileo spacecraft may support the hypothesis of a subsurface ocean on some of the jovian moon surfaces, such as Europa. Specifically, reflection spectra from the surface of this...
Laser Enhances Spectroscopy Technique's Sensitivity
Feb 1, 2002 — A forensic chemist in the trace evidence department at the South Carolina Law Enforcement Div., Lt. Joe Powell catches criminals with a 213-nm Nd:YAG laser attached to an inductively coupled mass spectrometer. This detection technique can identify...
The Cathedral of St. Peter: A Work in Progress
Feb 1, 2002 — Architectural scholar Stephen Murray said that, in Gothic architecture, buildings are viewed as a triumphal process, every advance in technology resulting in a bigger building. St. Peter's Cathedral at Beauvais was the last -- and perhaps the...
Microfacet Laser Displays 0.3-mW, 401-nm Operation
Feb 1, 2002 — Group III nitrides such as AlN, GaN and InN feature wide, direct bandgaps that make them particularly useful for ultraviolet and visible laser diodes. However, the conventional mirror-fabrication techniques tend to produce facets that are neither...
Laser Cooling Crystallizes Ion Beams
Feb 1, 2002 — Beams of accelerated ions are important tools in the investigation of atomic structures. The problem is that the ions collide while being accelerated and while in a magnetic storage ring, which reduces the quality of the beam. Now researchers at...
Photonic Gauge Has 0.03 °C Resolution
Feb 1, 2002 — Researchers have developed a way to take the temperature of a fluid on a tiny scale and with a light touch. The technique could have applications in microfluidic systems, the labs-on-a-chip that promise to revolutionize analytical chemistry and...
Spectrometry Identifies Fungi
Feb 1, 2002 — The emerging field of phyloproteomics seeks to categorize the relationships between microorganisms by the mass of their respective proteins. Now researchers at the University of Maryland in College Park have used matrix-assisted laser...
Fast Protons Generated with Double-Layer Foil Targets
Feb 1, 2002 — Using 1-ps pulses from an Nd:glass laser, researchers have shown that double-layer thin foils containing a high atomic number front layer and a low atomic number, hydrogen-rich back layer can generate fast protons with greater energies and current...
Microstructured Fibers Reviewed
Feb 1, 2002 — Microstructured optical fibers are not new, but interest has revived because of their potential applications in fields such as optical communications and optical coherence tomography. In an article in the Dec. 17 issue of Optics Express, researchers...
Reagents Crafted to Detect Chemical Properties
Feb 1, 2002 — A reagent containing intelligent polymerized crystalline colloidal arrays that colorimetrically indicate levels of pH, temperature and Pb2+ concentrations in solutions has been designed by researchers at the University of Pittsburgh. According to...
Interference Photolithography Produces Photonic Crystals
Feb 1, 2002 — A team from Pennsylvania State University in University Park has developed an interference-photolithography method to produce 2-D photonic crystal structures. The scientists fabricated the 0.8- to 2.0-µm-period titania arrays by exposing a...
Infiltrated Crystal Offers Tunable Bandgap
Feb 1, 2002 — Researchers in Katsumi Yoshino's group at Osaka University in Suita, Japan, have demonstrated photonic bandgap tunability in synthetic opal infiltrated with liquid crystal. They also have produced a tunable inverse opal, promising applications in...
Laser Assesses Particle Charge in Plasma
Feb 1, 2002 — Understanding the charge carried by particles in plasma is of keen interest to those investigating plasma environments ranging from thin-film production to interstellar clouds. However, most experimental methods of testing this property require a...
Researchers Spectrally Model Butterfly Wings
Feb 1, 2002 — In the past, researchers have tried to model butterfly wings as simple, planar thin-film structures to gain insight about their radiative effects, but they have produced results that fail to explain the blue iridescence of the Morpho menelaus. The...
Thin Film Blows Hot and Cold
Feb 1, 2002 — Some like it hot, some like it cold, but everybody likes it efficient. That's why a new thin-film thermoelectric material is attracting attention. It responds 23,000 times faster than the material in bulk and offers hundreds of times the cooling...
Function Designed to Authenticate Name Seals
Feb 1, 2002 — In China, a person must have a name seal to perform everyday functions such as withdrawing money from a bank, but visually authenticating the seals can take 5 to 10 minutes. To speed up the process, researchers from Yuan Ze University in Taiwan have...
InP Nanowires Act as Detectors
Feb 1, 2002 — They have been shown to work as LEDs, but indium-phosphide nanowires may also find a place in optical interconnects. A research team at Harvard University in Cambridge, Mass., has discovered that the nanowires exhibit different optical properties...
Vibrometer Makes Waves in Testing
Feb 1, 2002 — When it comes to making optical fiber for use in sensors that measure vibration and acoustic pressure, determining wave speed and mechanical loss can mean the difference between a sensor that works and one that does not. A team at Georgia Institute...
'Bar Code' Tags Aid Bioanalysis
Feb 1, 2002 — Biochemical reactions involve hundreds, sometimes thousands, of unique molecules. Fluorescent markers can be targeted toward specific molecules, but only a handful of spectrally distinct markers can feasibly be identified simultaneously in solution....
Polymer May Offer Switching Solutions
Feb 1, 2002 — An organic polymer and liquid crystal waveguide device under development by a team of researchers in Italy and Sweden promises applications in integrated optical circuits and in all-optical switches for telecommunications. If proved commercially...
Laser Controls Surface Reactions
Feb 1, 2002 — The ability to manage the location and timing of chemical reactions is key to advanced industrial and biochemical processes. A new laser technique promises unprecedented control over surface reactions. Although it is relatively easy to create the...
Quantum Dot Lasers Remain Stable
Feb 1, 2002 — Quantum dot lasers are, by nature, more thermally stable than quantum well lasers. Their confinement of a limited number of electrons and holes also limits thermal carrier distribution. Used as an active region for semiconductor lasers, quantum dots...
Polymer Coating Protects Immersed Fiber Optic Oxygen Sensors
Feb 1, 2002 — Pesky protein and microorganism buildup can foul up fiber optic oxygen sensors during long-term, continuous immersion in aqueous media, leading to drift and sensor failure. But researchers have discovered that polymer coatings containing...
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August 2024
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