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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: Electronics & Computers
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...
Briefs: Physical Sciences
A dusty-plasma apparatus is being investigated as means of accelerating nanometer- and micrometer-sized particles. Applications for the dusty-plasma particle accelerators fall into two classes:
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: Mechanical & Fluid Systems
An alternative method of controlled shifting of the center of mass has been proposed as a means of locomotion of a robot that comprises mostly a payload inside a hollow, approximately...
Briefs: Semiconductors & ICs
Improved Method of Manufacturing SiC Devices
The phrase, "common-layered architecture for semiconductor silicon carbide" ("CLASSiC") denotes a method of batch fabrication of microelectromechanical and semiconductor devices from bulk silicon carbide. CLASSiC is the latest in a series of related methods developed in recent years in continuing efforts...
Briefs: Semiconductors & ICs
LC Circuits for Diagnosing Embedded Piezoelectric Devices
A recently invented method of nonintrusively detecting faults in piezoelectric devices involves measurement of the resonance frequencies of inductor-capacitor (LC) resonant circuits. The method is intended especially to enable diagnosis of piezoelectric sensors, actuators, and...
Briefs: Software
Spacecraft Antenna Clusters for High EIRP
Several documents in a collection discuss a proposal to use clusters of appropriately phased, relatively small microwave antennas to obtain high levels of effective isotropically radiated power (EIRP) for transmission of data from spacecraft to Earth during exploration of distant planets. The advantages of...
Briefs: Software
Decision Support for Emergency Operations Centers
The Flood Disaster Mitigation Decision Support System (DSS) is a computerized information system that allows regional emergency-operations government officials to make decisions regarding the dispatch of resources in response to flooding. The DSS implements a real-time model of inundation utilizing...
Briefs: Electronics & Computers
Modeling and Diagnostic Software for Liquefying-Fuel Rockets
A report presents a study of five modeling and diagnostic computer programs considered for use in an integrated vehicle health management (IVHM) system during testing of liquefying-fuel hybrid rocket engines in the Hybrid Combustion Facility (HCF) at NASA Ames Research Center.
Briefs: Electronics & Computers
Progress on a Multichannel, Dual-Mixer Stability Analyzer
Several documents describe aspects of the continuing development of a multichannel, dual-mixer system for simultaneous characterization of the instabilities of multiple precise, low noise oscillators.
Briefs: Electronics & Computers
Nanowire thermoelectric devices, now under development, are intended to take miniaturization a step beyond the prior state of the art to exploit the potential advantages afforded by shrinking some device features...
Briefs: Electronics & Computers
No matter how sophisticated or advanced, electronic components must be attached reliably and securely if they are to deliver optimum performance. Beyond this universal requirement, particular...
Briefs: Electronics & Computers
Patch Antenna Fed via Unequal-Crossed-Arm Aperture
A proposed rectangular-patch antenna for transmitting or receiving microwave circularly polarized (CP) radiation would be fed via a cross-shaped aperture that would have unequal arms and would, in turn, be fed at a single point via a microstrip transmission line. As a consequence of the unequal-arm...
Briefs: Manufacturing & Prototyping
Parylene C as a Sacrificial Material for Microfabrication
Although Parylene C cannot be patterned lithographically like photoresists, it nevertheless extends the range of processing options by offering a set of properties that are suitable for microfabrication and are complementary to those of photoresists. The compatibility of Parylene C with...
Briefs: Manufacturing & Prototyping
A method of fabrication of wires having micron and submicron dimensions is built around electrochemical deposition of the wires in their final positions between electrodes in integrated...
Briefs: Information Technology
Applying Standard Interfaces to a Process-Control Language
A method of applying open-operating-system standard interfaces to the NASA User Interface Language (UIL) has been devised.
Briefs: Software
A method for adaptive (or, optionally, nonadaptive) filtering has been developed for estimating the states of complex process systems (e.g., chemical plants, factories, or manufacturing...
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: Materials
Multifunctional hinges have been developed for deploying and electrically connecting panels comprising planar arrays of thin-film solar photovoltaic cells. In the original intended...
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...
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