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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6120
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Briefs: Physical Sciences
Briefs: Physical Sciences
Code for Analyzing and Designing Spacecraft Power System Radiators
A specific application is for Stirlingcycle/linear-alternator electric-power systems coupled to radioisotope general-purpose heat sources. GPHRAD affords capabilities and options to account for thermophysical properties (thermal conductivity, density) of either metal-alloy or...
Briefs: Physical Sciences
An improved miniature time-of-flight mass spectrometer has been developed in a continuing effort to minimize the sizes, weights, power demands, and costs of mass spectrometers for such diverse...
Briefs: Medical
The term “satellite-derived management zones” (SAMZ) denotes agricultural management zones that are subdivisions of large fields and that are derived from images of the fields acquired by instruments...
Briefs: Medical
Briefs: Physical Sciences
Vacuum apparatuses have been developed for increasing the range of elements that can be identified by use of x-ray fluorescent (XRF) scanners of the type mentioned in the two immediately preceding articles. As...
Briefs: Physical Sciences
Systems for identifying objects by means of x-ray fluorescence (XRF) of encased labeling elements have been developed. The XRF spectra of objects so labeled...
Briefs: Physical Sciences
A digital equivalent data system (DEDS) is a system for identifying objects by means of the x-ray fluorescence (XRF) spectra of labeling elements that are encased in or deposited on the...
Briefs: Physical Sciences
A new Spectral Beam Combining (SBC) architecture is currently being developed to address the limitations diode laser bars in applications requiring high output power and excellent beam...
Briefs: Physical Sciences
In optical systems in which laser illumination is delivered via multimode optical fibers, laser speckle can be rendered incoherent by a simple but highly effective technique. The need to...
Briefs: Physical Sciences
In a modification of the basic configuration of InAs quantum-dot semiconductor lasers on (001)lnP substrate, a thin layer (typically 1 to 2 monolayer thick) of GaAs is incorporated...
Briefs: Physical Sciences
A system that generates an intense, nearly collimated, nearly monochromatic, small-diameter x-ray beam has been developed for use in macromolecular crystallography. A conventional...
Briefs: Physical Sciences
A proposed highly accurate clock or oscillator would be based on the concept of an opto-electronic oscillator (OEO) stabilized to an atomic transition. Opto-electronic oscillators, which have...
Briefs: Medical
The figure depicts a replaceable microfluidic cartridge that is a component of a miniature biosensor that detects target deoxyribonucleic acid (DNA) sequences. The biosensor utilizes (1)...
Briefs: Physical Sciences
A compact, lightweight heat exchanger has been designed to be fault-tolerant in the sense that a single-point leak would not cause mixing of heat-transfer fluids. This particular heat exchanger is intended to be...
Briefs: Physical Sciences
Automatic Focus Adjustment of a Microscope
AUTOFOCUS is a computer program for use in a control system that automatically adjusts the position of an instrument arm that carries a microscope equipped with an electronic camera.
Briefs: Physical Sciences
The figure depicts a device for measuring the electrical conductivity of a flowing liquid. Unlike prior such devices, this one does not trap gas bubbles entrained in the liquid.
Briefs: Medical
A method has been invented for utilizing directed, hyperthermal oxygen atoms and ions for texturing tips of polymeric optical fibers or other polymeric optical components for use in...
Briefs: Physical Sciences
Many feeder cattle companies currently conduct “slaughterability” assessments by sending cattle through a chute and photographing them from above with a CCTV or visible light camera...
Briefs: Physical Sciences
Theoretical calculations indicate that it should be possible for one-dimensional (1D) photonic crystals (see figure) to exhibit giant dispersions known as the superprism effect. Previously,...
Briefs: Physical Sciences
Depth-Penetrating Luminescence Thermography of Thermal-Barrier Coatings
A thermographic method has been developed for measuring temperatures at predetermined depths within dielectric material layers — especially thermal-barrier coatings. This method will help satisfy a need for noncontact measurement of through-the-thickness temperature gradients...
Briefs: Physical Sciences
Bare fiber measurements are common in optical component manufacturing before the device under test (DUT) is connectorized and final tested. Insertion loss and polarization dependent...
Briefs: Physical Sciences
The recent development of indium gallium arsenide (InGaAs) focal plane arrays (FPAs) capable of imaging visible and shortwave infrared (SWIR) wavelengths has yielded a miniature...
Briefs: Photonics/Optics
A two-photon fluorescence microscope has been developed for the study of biophysical phenomena. Two-photon microscopy is a novel form of laser-based scanning microscopy that enables...
Briefs: Physical Sciences
Simulations of Evaporating Multicomponent Fuel Drops
A paper presents additional information on the subject matter of “Model of Mixing Layer With Multicomponent Evaporating Drops” (NPO-30505), NASA Tech Briefs, Vol. 28, No. 3 (March 2004), page 55. To recapitulate: A mathematical model of a three-dimensional mixing layer laden with evaporating...
Briefs: Physical Sciences
Tumbleweed Rovers
Tumbleweed rovers, now undergoing development, are lightweight, inflatable, approximately spherical exploratory robotic vehicles designed to roll across terrain, using only wind for propulsion. Tumbleweed rovers share many features with "beach-ball" rovers, which were discussed in several prior NASA Tech Briefs articles. Conceived...
Briefs: Physical Sciences
A modified Penning-Malmberg trap that could store a small cloud of antiprotons for a relatively long time (weeks) has been developed. This trap is intended for use in research on the...
Briefs: Medical
Articulating Support for Horizontal Resistive Exercise
A versatile mechanical device provides support for a user engaged in any of a variety of resistive exercises in a substantially horizontal orientation. The unique features and versatility of the device promise to be useful in bed-rest studies, rehabilitation, and specialized strength training....
Briefs: Medical
A device built around a pair of electronic shutters has been demonstrated to be effective as a prototype of stroboscopic goggles or eyeglasses for preventing or reducing motion sickness. The...
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