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Briefs: Information Technology
A program of research on the use of wavelets for compression of data in a parallel-computing environment has led to development of a scheme for compressing image data. The purpose of the research...
Briefs: Electronics & Computers
The figure illustrates the major functional blocks of an impedance-based cable-testing apparatus that can locate an open or short circuit in a cable. There is no need to disconnect the cable from all other equipment...
Briefs: Electronics & Computers
A cable-testing apparatus has been designed for use in detecting a short or open circuit in a cable, subject to a special frequency requirement as explained in the next paragraph. This cable tester is...
Briefs: Energy
Curves of limiting voltage (V) as a function of temperature (T) for nickel/cadmium cells and batteries can be computed by use of a mathematical cell model based on first principles....
Briefs: Electronics & Computers
The Lightning Detection and Ranging (LDAR) system is a network of lightning-monitoring stations at Kennedy Space Center. The LDAR system contains equipment for measuring and indicating the...
Briefs: Electronics & Computers
Recombination lifetime and minority-carrier lifetime are key performance parameters of semiconductor wafers used for microelectronics and solar cells. They are also...
Briefs: Electronics & Computers
A technique based on infrared-emission spectroscopy has been found to be useful for noncontact measurement of the temperature of a hot spot in the gate channel of a GaAs...
Briefs: Electronics & Computers
Rechargeable, thin-film, lithium-based microbatteries of the proposed type would be manufactured in the discharged condition, and lithium anodes would be formed in situ during...
Briefs: Test & Measurement
An instrumentation system automates the detection and location of faults in multiconductor electrical cables. It can accelerate diagnoses of aircraft, automotive, or industrial cables, while reducing...
Briefs: Information Technology
A unified theory of linear time-invariant (LTI) representations has been developed for use in the analysis and design of adaptive, narrow-band, feedforward controllers for systems...
Briefs: Software
Program for Design Analysis of Cache Memory
CACHESIM is a C-language computer program that simulates (1) cache-memory options associated with a computer hardware design concept and (2) related properties that can be expected to affect the overall performance of the computer, before the computer is constructed. Heretofore, the performance effects...
Briefs: Software
Software for Retrieval and Display of Planetary Data
The NASAView computer program provides access to, and display of, sets of scientific data in the Planetary Data System (PDS) archive. These data — totalling about 5 terabytes — were acquired during NASA's planetary-exploration missions and are stored along with descriptive information useful...
Briefs: Software
Program for Microanalysis of Composite Structures
Version 3.0 of the Boundary Element Solutions Technology Composite Modeling System (BESTCMS 3.0) is an advanced engineering software system for the microanalysis of fiber composite structures. BESTCMS is based on the BEST3D boundary-element program (COSMIC program LEW-15351). BESTCMS affords...
Briefs: Electronics & Computers
During the development and testing of signal processing systems, it is useful to generate test signals in the laboratory in order to quantify system parameters such as dynamic range,...
Briefs: Information Technology
Modified Taguchi techniques of robust design optimization are used in an innovative method of training artificial neural networks — for example the network shown in the figure. As in...
Briefs: Information Technology
Software for Assessing Effects of Designs on Operations
The Operations Impact Assessor (OIA) computer program facilitates rapid assessment of the effects of designs of spacecraft on spacecraft-processing operations at a launch site. OIA is a user-friendly, object-oriented, artificial-intelligence application program that features model-based...
Briefs: Electronics & Computers
Process for Fabrication of Micro Fluidic Structures
Through an innovative microfabrication process, enclosed microstructures are created for "laboratory on a chip" applications, such as medical diagnostics. These microstructures include capillaries, tunnels, pipettes, reaction vessels, and cavities. Using only conventional lithographic techniques,...
Briefs: Energy
The alumina for making a suspension according to this concept must be in the form of a highly pure (preferably >99.99 percent) powder with a suitable particle-size distribution —...
Briefs: Electronics & Computers
The figure illustrates a lightweight composite-material dual-beam reflector antenna for the SeaWinds spaceborne scatterometer instrument, which operates in the Ku band and is designed to measure wind...
Briefs: Information Technology
An improved method of analysis and design offers the potential to enhance the performances of adaptive feedforward tracking systems. The method can, in principle, make it possible to...
Briefs: Electronics & Computers
The sight-to-touch translator (ST3) is a conceptual electronic apparatus that would generate a tactile representation of visible objects in its vicinity. The ST3 would be worn by a blind person; the tactile display...
Briefs: Software
Software for Tooth-Contact Analysis of Spiral Bevel Gears
The SBGTAPER computer program implements a method for design and generation of spiral bevel gears that feature tapered teeth with localized bearing contact and a low level of transmission errors. The influence of misalignment on transmission errors and shift of bearing contact were...
Briefs: Information Technology
Expressing Object-Oriented Concepts in Fortran 90
A methodology for object-oriented programming in Fortran 90 has been developed. The methodology provides for emulation of the most important object-oriented concepts of C++; namely, classes (including abstract data types, encapsulation, and function overloading), inheritance, and dynamic...
Briefs: Manned Systems
Sensors made largely of commercially available optical and electronic components are being developed for use in measuring small horizontal displacements of payloads suspended below...
Briefs: Electronics & Computers
Three coplanar-stripline circuits have been designed to perform coupling and filtering functions in microwave systems. These circuits could be incorporated into feed networks for microwave...
Briefs: Electronics & Computers
Data signals can be transmitted via the same optical fibers that are used to transmit power from base stations to remote stations containing sensors and associated circuitry. [A prototype...
Briefs: Motion Control
An improved motor controller provides a circuit that will allow a motor to run at full speed while traveling from point A to point B, and still be able to obtain the desired damping...
Briefs: Electronics & Computers
Signaling-and-Detection Scheme for Beacon Monitoring
A signaling-and-detection scheme has been proposed for use in conjunction with the remote-monitoring concept described in "Beacon Monitoring Would Reduce Interactions With Remote Systems" (NPO-19706), NASA Tech Briefs, Vol. 21, No. 5 (May 1997), page 54. To recapitulate: A remote system (a...
Briefs: Software
Software for Improving Operational Processes
The Schedule and Cost Risk Analysis Modeling System (SCRAM) computer program identifies important sources of schedule and cost risks in an operational process. The related Process Analysis and Improvement Support System (PASS) program assists in the overall analysis and improvement of an operational...
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