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Briefs: Electronics & Computers
Space missions requiring the highest upset rate immunity typically turn to rad-hard system designs. Unfortunately, these systems are many generations behind...
Briefs: Electronics & Computers
A proposed optoelectronic instrument would identify targets rapidly, without need to radiate an interrogating signal, apply identifying marks to the targets, or equip...
Briefs: Manufacturing & Prototyping
A finned-ladder structure has been invented in an effort to improve the design of the slow-wave circuit of a traveling-wave tube (TWT). The point of departure for the design effort was a prototype TWT...
Briefs: Electronics & Computers
Directional Radio-Frequency Identification Tag Reader
A directional radio-frequency identification (RFID) tag reader has been designed to facilitate finding a specific object among many objects in a crowded room. The device could be an adjunct to an electronic inventory system that tracks RFID-tagged objects as they move through reader-equipped...
Briefs: Materials
Some changes have been incorporated into a proposed method of manufacturing regular arrays of precisely sized, shaped, positioned, and oriented carbon nanotubes. Such arrays could be...
Briefs: Software
Software for Checking Statecharts
HiVy is a software tool set that enables verification through model checking of designs represented as finite-state machines or statecharts. HiVy provides automated translation of (1) statecharts created by use of the MathWorks Stateflow® program to (2) Promela, the input language of the Spin model checker, which...
Briefs: Software
Program Predicts Broadband Noise From a Turbofan Engine
Broadband Fan Noise Prediction System (BFaNS) is a computer program that, as its name indicates, predicts the broadband noise generated by the fan stage of a turbofan engine. This noise is the sum of (1) turbulent- inflow noise, which is caused by turbulence impinging on leading edges of the...
Briefs: Software
Protocol for Delay-Tolerant Data-Communication Network
As its name partly indicates, the Delay-Tolerant Networking (DTN) Bundle Protocol is a protocol for delay-tolerant transmission of data via communication networks. This protocol was conceived as a result of studies of how to adapt Internet protocols so that Internet-like services could be...
Briefs: Software
Software Implements a Space-Mission File-Transfer Protocol
CFDP is a computer program that implements the CCSDS (Consultative Committee for Space Data Systems) File Delivery Protocol, which is an international standard for automatic, reliable transfers of files of data between locations on Earth and in outer space. CFDP administers concurrent file...
Briefs: Mechanical & Fluid Systems
The figure presents selected views of a modular rake of 17 pitot probes for measuring both transient and steady-state pressures in a supersonic wind tunnel. In addition to pitot tubes visible in the figure, the...
Briefs: Electronics & Computers
The combination of a de-embedding technique and a direct on-substrate measurement technique has been devised to enable measurement of the electrical characteristics (impedances,...
Briefs: Software
Predicting Accumulations of Ice on Aerodynamic Surfaces
LEWICE is a computer program that predicts the accumulation of ice on two-dimensional aerodynamic surfaces under conditions representative of the flight of an aircraft through an icing cloud. The software first calculates the airflow surrounding the body of interest, then uses the airflow to...
Briefs: Medical
An improved computational-simulation system for interactive medical imaging has been invented. The system displays high-resolution, three-dimensional-appearing images of anatomical objects based on...
Briefs: Medical
Fossils of primates and early humans exhibit great diversity in the size and shape of the jaw, teeth, and facial skeleton. Anthro- pologists theorize that these different skull...
Briefs: Physical Sciences
Scanning microscopes that would be based on microchannel filters and advanced electronic image sensors and that utilize x-ray illumination have been proposed. Because the finest resolution...
Briefs: Physical Sciences
Slotting Fins of Heat Exchangers To Provide Thermal Breaks
Heat exchangers that include slotted fins (in contradistinction to continuous fins) have been invented. The slotting of the fins provides thermal breaks that reduce thermal conduction along flow paths (longitudinal thermal conduction), which reduces heat-transfer efficiency. By increasing...
Briefs: Physical Sciences
Methane Clathrate Hydrate Prospecting
A method of prospecting for methane has been devised. The impetus for this method lies in the abundance of CH4 and the growing shortages of other fuels. The method is intended especially to enable identification of subpermafrost locations where significant amounts of methane are trapped in the form of methane...
Briefs: Electronics & Computers
A proposed design for a phased array fed cylindrical reflector microwave antenna would enable enhancement of the radiation pattern through partially adaptive amplitude and phase control...
Briefs: Electronics & Computers
A command interface application-specific integrated circuit (ASIC) and an analog interface ASIC have been developed as a chip set for remote actuation and monitoring of a collection of...
Briefs: Mechanical & Fluid Systems
A control valve that can throttle high-pressure cryogenic fluid embodies several design features that distinguish it over conventional valves designed for...
Briefs: Mechanical & Fluid Systems
The flight-test community routinely spends considerable time and money to determine a range of flight conditions, called a flight envelope, within which an aircraft is safe to fly. The cost...
Briefs: Mechanical & Fluid Systems
The Aerostructures Test Wing (ATW) was an apparatus used in a flight experiment during a program of research on aeroelastic instabilities. The ATW experiment was performed to study a specific instability known as...
Briefs: Information Technology
Acoustical Applications of the HHT Method
A document discusses applications of a method based on the Huang-Hilbert transform (HHT). The method was described, without the HHT name, in "Analyzing Time Series Using EMD and Hilbert Spectra" (GSC-13817), NASA Tech Briefs, Vol. 24, No. 10 (October 2000), page 63. To recapitulate: The method is especially...
Briefs: Information Technology
Developments at the Advanced Design Technologies Testbed
A report presents background and historical information, as of August 1998, on the Advanced Design Technologies Testbed (ADTT) at Ames Research Center. The ADTT is characterized as an activity initiated to facilitate improvements in aerospace design processes; provide a proving ground for...
Briefs: Information Technology
Remote Sensing and Information Technology for Large Farms
A method of applying remote sensing (RS) and information- management technology to help large farms produce at maximum efficiency is undergoing development. The novelty of the method does not lie in the concept of "precision agriculture," which involves variation of seeding, of...
Briefs: Information Technology
The vector-ordering filter (VOF) technique involves a procedure for sampling a large population of data vectors to select a subset of data vectors that fully characterize the state space of...
Briefs: Information Technology
The Bayesian conditional probability (BCP) technique is a statistical fault-decision technique that is suitable as the mathematical basis of the fault-manager module in the...
Briefs: Information Technology
The figure schematically illustrates a method and procedure for automated monitoring of an asset, as well as a hardware-and- software system that implements the method and procedure. As used...
Briefs: Software
High-Speed Recording of Test Data on Hard Disks
Disk Recording System (DRS) is a systems- integration computer program for a direct-to-disk (DTD) high-speed data-acquisition system (HDAS) that records rocket-engine test data. The HDAS consists partly of equipment originally designed for recording the data on tapes. The tape recorders were replaced...
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