Briefs: Electronics & Computers
MEMS Design Optimization With FEA

This report examines design considerations in one of the most promising new areas of engineering – Micro Electro Mechanical Systems (MEMS). Designing and optimizing MEMS devices involves unique challenges, including analyzing the inter- dependent physical phenomena to which MEMS devices are sensitive and...

Briefs: Electronics & Computers
Further Developments Regarding Noise-Reducing Slots in QWIPs

A report presents additional information on the devices described in “Noise-Reducing Slots in Quantum-Well Infrared Photodetectors” (NPO-20518), NASA Tech Briefs, Vol. 25, No. 6 (June 2001), page 6a. To recapitulate: it was proposed that incorporation of suitably dimensioned...

Briefs: Information Technology
Time-Parallel Algorithms for Solving PDEs

A report presents additional details about a class of massively parallel algorithms for finite-difference numerical solution of time-dependent partial differential equations (PDEs). Some aspects of these algorithms were described in two previous articles in NASA Tech Briefs; namely, “Massively Parallel...

The Rover Analysis Modeling and Simulation (ROAMS) algorithm is to solve the kinematics of a wheeled mo- bile robot (rover) traversing on a rocky terrain. The rover is constructed...

Briefs: Motion Control
Software for Simultaneous Control of Three Magnetic Bearings

Five-Axis, Three-Magnetic-Bearing Control Code (FATMaCC) is a C++-language computer program for controlling a magnetic thrust bearing in one degree of freedom and two magnetic radial bearings, each in two degrees of freedom. These bearings levitate a vertical-axis rotor for experiments...

Briefs: Mechanical & Fluid Systems
Crowned Races for Crossed Roller Bearings

Crowned races have been proposed for crossed roller bearings. Crowning of the races is expected to reduce scuffing of the cylindrical rollers. Crowning of the races is expected to be especially...

Briefs: Photonics/Optics
Fabricating Sapphire Optical Fibers for High-Temperature Use

A process for the fabrication of coated sapphire multimode optical fibers has been developed. Sapphire multimode optical fibers are suitable for use as embedded sensors for measuring mechanical and thermal stresses and strains in material specimens at temperatures up to about 1,500...

A rectangular array of Y-junction electro-optical switches has been proposed as a prototype of reliable, high-speed cross-point switches for fiber-optic-based photonic communication...

An optoelectronic device based on interferometry in a resonant microcavity has been proposed for use in measuring the direction of arrival of a circularly polarized beam of light...

A process that would include a combination of dry and wet chemical etching has been proposed for making facets for low-loss mirrors on silicon-on-insulator (SOI) optical waveguides....

Briefs: Materials
Improved Conversion Coating for Protection of Metals

A simple, cost effective, environmentally friendly conversion-coating process has been developed for protecting a variety of metals against wear and corrosion and to increase adhesion of paints. This process results in the deposition of a thin, adherent coats of iron phosphate on treated metal...

Improved lightweight composite-material structures have been invented to protect persons and equipment during aircraft and ground-vehicle crashes. These structures are designed to hold...

Crystalline phases of compounds of general composition (Cuw, CuxFey, or Tiz)Mo6Se8 [where w<4, x<2, y<1, and...

Alkyl pyrocarbonates have been found to be useful as electrolyte additives for improving the low-temperature performances of rechargeable lithium-ion electrochemical cells. The...

Partially fluorinated alkyl carbonate liquid compounds have been found to be excellent electrolyte cosolvents for rechargeable lithium-ion electrochemical cells. The benefits...

Non-polymeric N,N´-di-N-hydrocarbyl- 2,5-diamino-1,4-benzoquinones (where the hydrocarbyl substituents are alkyl or aryl) have been found to be useful as corrosion-inhibiting additives...

Briefs: Electronics & Computers
Multiple-Cavity Masers as 32-GHz LNAs

Improved multiple-cavity ruby masers are under development for use as lownoise amplifiers (LNAs) for receiving very weak radio signals in frequency bands up to and including one centered approximately at 32 GHz. These masers were designed specifically to be incorporated into receivers in ground stations of...

Briefs: Software
Program for Tracking Air-Purification Cartridges

The Cartridge Automated Reliance Tracking (CART) computer program enables authorized requesters associated with NASA to gain access to the most recent tracking data on LiOH-based airpurification cartridges used during space-shuttle flights. CART could also be adapted to suit the needs of other...

Briefs: Software
Software for Implementing Fuzzy Logic on Microcontrollers

Fuzzy Inference System Translator (FIST) is a computer program that facilitates the implementation of fuzzy-logic software on commercial or other viable microcontrollers. In the original application for which FIST was developed, there was a need to implement plantgrowth- chamber (PGC)...

Briefs: Software
Software for Constructing a Facility-Management Database

Facility Management Tracking System (FMTS) is a computer program for constructing an integrated database that defines any event in a managed facility. FMTS provides a simple user interface for entering all relevant data connected to the event. The entered data, as displayed and processed...

Briefs: Software
Software Implements Telemetry Protocols

The CCSDS Telemetry and Telecom Software Library provides a reference implementation of the Consultative Committee for Space Data Systems (CCSDS) international protocol standard for the transmission and reception of telemetry and telecommand data in radio communications with spacecraft. The library...

Briefs: Software
Software for Parallel Processing of Telemetry

Parallel Telemetry Processor (PTEP) is a high-speed, robust, extensible, Javalanguage computer program that (1) enables the parallel processing of a serial stream of telemetric data and (2) generates a graphical display for monitoring the processing. Originally intended for application to spacecraft...

Briefs: Software
Software for Global Forecasting of Winds and Waves

The WorldWinds™ software system generates high-resolution global weather forecasts, with emphasis on wind and ocean-wave vectors, in nearly real time. WorldWinds™ was developed primarily to serve organizations and individuals needing accurate forecasts for scientific, safety, or economic...

Briefs: Software
Software for Modeling Spacecraft Electric Power

Multi-Mission Power Analysis Tool (MMPAT) is a computer program for constructing computational models of the generation, storage, consumption, and flow of electric power in a spacecraft. Heretofore, such modeling has been accomplished by means of unique software for each application. In contrast,...

Briefs: Mechanical & Fluid Systems
Pressure-Balanced, Low-Hysteresis Finger Seal

A second-generation design for a finger seal has been proposed to reduce a hysteretic effect that gives rise to increased leakage in a first-generation finger seal. As explained below, the...

Briefs: Mechanical & Fluid Systems
Instrument for Measuring Extreme Winds

An instrument is undergoing development for use in measuring both the horizontal direction and the horizontal speed of wind in the speed range from 60 to 300 mph (about 27 to 134 m/s) at a rate of at...

Briefs: Mechanical & Fluid Systems
Mechanized Harvesting of Plants in a Controlled Environment

The proposed Plant Harvesting Mechanization System (PHARMS) would comprise machinery and controls for semiautomated harvesting of plants grown in a controlled environment. The PHARMS was conceived as a prototype of harvesters to be incorporated into life-support systems of spacecraft...

Normally, the damage that results in a total loss of the primary flight control of a transport airplane, including all the engines on one side, would be catastrophic. Dryden Flight...

Briefs: Manufacturing & Prototyping
High-Velocity, Pulsed Wire Arc Spray

A high-velocity, pulsed wire arc spraying apparatus has been proposed and partly developed in an effort to improve the quality of coatings deposited by thermal spray techniques. In this apparatus, material from a wire arc is atomized and propelled toward a deposition substrate by a repetitively pulsed plasma...

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