Stories
6,36,37,43,46,48,50,56,58,59,60
7,8,36,110,131,134,135,138,139,141,142,144,145,151,152,201,202
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Briefs: Physical Sciences
Internal heating is a key issue for vertical cavity surface emitting lasers (VCSELs), a semiconductor microlaser diode that emits light in a cylindrical beam vertically from the surface of a fabricated...
Briefs: Physical Sciences
A broadband external-cavity diode laser (ECDL) has been invented for use in spectroscopic surveys preparatory to optical detection of gases. Heretofore, commercially available ECDLs have been designed, in...
Briefs: Physical Sciences
Solar photovoltaic cells would be designed to exploit photonic-bandgap (PBG) materials to enhance their energy- conversion efficiencies, according to a proposal. Whereas the...
Briefs: Physical Sciences
A method of determining the position and attitude of a body equipped with a Global Positioning System (GPS) receiver includes an accounting for the location of the nonunique phase...
Briefs: Physical Sciences
Holographic glass light-shaping diffusers (GLSDs) are optical components for use in special-purpose illumination systems (see figure). When properly positioned with respect to lamps and areas to...
Briefs: Physical Sciences
A compact windscreen has been conceived for a microphone of a type used outdoors to detect atmospheric infrasound from a variety of natural and man-made sources. Wind at the microphone site contaminates received...
Briefs: Physical Sciences
Automated Counting of Particles To Quantify Cleanliness
A machine vision system, similar to systems used in microbiological laboratories to count cultured microbes, has been proposed for quantifying the cleanliness of nominally precisely cleaned hardware by counting residual contaminant particles. The system would include a microscope equipped with...
Briefs: Medical
Multicompartment Liquid- Cooling/Warming Protective Garments
Shortened, multicompartment liquid-cooling/ warming garments (LCWGs) for protecting astronauts, firefighters, and others at risk of exposure to extremes of temperature are undergoing development. Unlike prior liquid circulation thermal-protection suits that provide either cooling or...
Briefs: Medical
The figure schematically depicts a miniature laboratory system that has been proposed for use in the field to detect sparsely distributed biomolecules. By emphasizing concentration and...
Briefs: Physical Sciences
Estimating Aeroheating of a 3D Body Using a 2D Flow Solver
A method for rapidly estimating the aeroheating, shear stress, and other properties of hypersonic flow about a three-dimensional (3D) blunt body has been devised. First, the geometry of the body is specified in Cartesian coordinates. The surface of the body is then described by its...
Briefs: Physical Sciences
Solid-Phase Extraction of Polar Compounds From Water
A solid-phase extraction (SPE) process has been developed for removing alcohols, carboxylic acids, aldehydes, ketones, amines, and other polar organic compounds from water. This process can be either a subprocess of a water-reclamation process or a means of extracting organic compounds from water...
Briefs: Physical Sciences
The Mars Electrostatics Chamber (MEC) is an environmental chamber designed primarily to create atmospheric conditions like those at the surface of Mars to support experiments on electrostatic...
Briefs: Physical Sciences
A multistage system has been proposed for cooling a circulating fluid that is subject to intermittent intense heating. The system would be both flexible and redundant in that it could...
Briefs: Physical Sciences
Laser gauges have been developed to satisfy requirements specific to monitoring the amplitude of the motion of an optical path- length modulator that is part of an astronomical...
Briefs: Physical Sciences
Recent advances in fiber technology have enabled a dramatic increase in the power delivered from fiber based amplifiers and lasers. This is particularly true at the 1060-nm...
Briefs: Physical Sciences
A family of iron-nickel and ironnickel- cobalt alloys made using metal injection technology (MIT) has been designed to match the coefficient of thermal expansion (CTE) of...
Briefs: Electronics & Computers
Units of superconducting circuitry that exploit the concept of the single-Cooper-pair box (SCB) have been built and are undergoing testing as prototypes of logic gates that could, in...
Briefs: Physical Sciences
Improved Electrolytic Hydrogen Peroxide Generator
An improved apparatus for the electrolytic generation of hydrogen peroxide dissolved in water has been developed. The apparatus is a prototype of H2O2 generators for the safe and effective sterilization of water, sterilization of equipment in contact with water, and other applications in which there...
Briefs: Physical Sciences
Three optical gauges have been developed for guiding the assembly and measuring precisely the reflecting surfaces of a compound mirror that comprises a corner-cube retroreflector glued in...
Briefs: Materials
Verifying the Safety of a Radioactive Waste Container With Simulation Software
As part of decommissioning the U.S. Department of Energy (DOE) Hanford Site — an inactive nuclear facility in southeastern Washington — a contaminated apparatus called a glovebox (a steel isolation chamber with built-in gloves that allow personnel to remotely...
Briefs: Physical Sciences
A recently developed mathematical model of the output (displacement) versus the input (applied voltage) of a piezoelectric transducer accounts for hysteresis. For the sake of computational speed, the...
Briefs: Physical Sciences
Thin-film heat-flux sensors of a proposed type would offer advantages over currently available thin-film heat flux sensors. Like a currently available thin-film heat-flux sensor, a sensor according to the...
Briefs: Physical Sciences
Controlling Laser Spot Size in Outer Space
Three documents discuss a method of controlling the diameter of a laser beam projected from Earth to any altitude ranging from low orbit around the Earth to geosynchronous orbit. Such laser beams are under consideration as means of supplying power to orbiting spacecraft at levels of the order of tens of...
Briefs: Medical
In the race to deliver drugs to market more quickly, biopharmaceutical companies need to classify and interpret data at unprecedented rates with tools that eliminate...
Briefs: Medical
Microwave Treatment of Prostate Cancer and Hyperplasia
Microwave ablation in the form of microwave energy applied to a heart muscle by a coaxial catheter inserted in a vein in the groin area can be used to heat and kill diseased heart cells. A microwave catheter has been developed to provide deep myocardial ablation to treat ventricular tachycardia...
Briefs: Test & Measurement
A technique has been devised for measuring the relative humidity levels in the protective helium/water vapor atmosphere in which the Declaration of Independence, the United States Constitution, and...
Briefs: Physical Sciences
Thermal Imaging of Earth for Accurate Pointing of Deep-Space Antennas
A report discusses a proposal to use thermal (long-wavelength infrared) images of the Earth, as seen from spacecraft at interplanetary distances, for pointing antennas and telescopes toward the Earth for Ka-band and optical communications.
Briefs: Physical Sciences
Shock Waves in a Bose-Einstein Condensate
A paper presents a theoretical study of shock waves in a trapped Bose-Einstein condensate (BEC).
Briefs: Physical Sciences
Devices called “solid-state ferroelectric-based sources” (SSFBSs) are under development as sources of electrons, ions, ultraviolet light, and x-rays for diverse applications in...
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