Briefs : Electronics & Computers
Sequential-Color LED Illumination for Reflective Microdisplays

Integrated silicon microdisplays, such as liquid-crystal-on-silicon (LCOS) devices, are becoming the most effective image source for high-resolution viewfinders, head- mounted displays, and helmet-mounted displays (HMDs). Since these microdisplays are reflective in nature, they...

Briefs : Electronics & Computers
Multifunction Input/Output Integrated Circuits

Integrated circuits that would perform a variety of analog-signal, digital- signal, and power input/output functions have been proposed. Conceived for use as versatile, fault-tolerant interfaces among components and subsystems of spacecraft, these multifunction integrated circuits could also be...

Briefs : Electronics & Computers
SEU-Tolerant Flip-Flops

Several improvements in the designs of flip-flop circuits that are parts of logic circuits have been proposed to reduce the incidence of logic errors associated with single- event upsets (SEUs) [bit flips caused by incident energetic ionizing particles]. Traditionally, radiation-hardened integrated circuits have been...

Briefs : Electronics & Computers
Console for an Overhead-Bridge Crane

Human factors engineering has been applied to the design of an overheadbridge crane control console for use by a seated operator in a clean-room environment. The crane console provides the operator with the ability to lift and move loads up to 27.5 tons (24.9 tonnes) in three vertical speed ranges and three...

Briefs : Electronics & Computers
High-Temperature Coils for Electromagnets

Coiled electric wires have been developed for use in electromagnets that operate at high temperatures. Examples of such electromagnets could include the actuators in magnetic bearings in advanced gas turbines.

Briefs : Software
Software Generates Sequences of Operations for a Mars Rover

Automated Rover Sequence Generation (ARSG) is a prototype computer program for ground-based automatic generation of sequences of commands that can be used for a robotic exploratory vehicle (rover) on Mars. ARSG is based on the Automated Scheduling and Planning Environment (ASPEN)...

Briefs : Software
Web-Based Software Service Improves Space-Shuttle Processing

Human data-transfer from space-shuttle checkout systems to shuttle business systems is slow, error-prone, and expensive. The Operations and Maintenance Requirement Specification-Automated Buy Off System (OMRS-ABOS) is a software system that automatically transfers test-validation data...

Briefs : Software
Program Analyzes Current Signatures of Solenoid Valves

A computer program processes signal data in the instrument described in “Current- Signature Sensor for Diagnosing Solenoid Valves” (KSC-12152), NASA Tech Briefs, Vol. 25, No. 9 (September 2001), page 30. Ten-bit samples of the electric current in a solenoid valve are acquired at a rate...

Briefs : Software
Program Predicts Radiation Forces on a Satellite

A computer program predicts the radiation forces on the TOPEX/ Poseidon satellite at any point in its orbit around the Earth. The program performs a unified analysis of the thermal, radiative, power-generation, and orbital-mechanics aspects of operation because these aspects are inter- dependent:...

Briefs : Software
OwWwL and AgentNation: Knowledge-Robot Software

OwWwL and Agent- Nation are Java- language computer programs that act together, quickly scanning Internet databases for relevant information, then organizing the infor- mation into a format suited to the user. OwWwL is a search- engine program that, like other such programs, includes a “spider”...

Briefs : Software
Application Fault Injector

Application Fault Injector (AFI) is a simple com- puter program for testing the fault tolerance of other programs. AFI is a library of subroutines designed to inject faults into memory, data structures, and registers. The library is modular, can easily be extended, and can easily be ported to different computer...

Briefs : Materials
Reducing Wear and Friction of CVD Diamond Films

Progress has been achieved in continuing research directed toward increasing the wear resistance and enhancing the self- lubrication properties of chemical-vapor-deposited (CVD) diamond films. Such films are potentially useful as friction- and wear-reducing coats on sliding mechanical components...

Briefs : Mechanical & Fluid Systems
Water-Jet Accelerator for Launching a Spacecraft

A proposed ground- based apparatus would accelerate a spacecraft to speed of about mach 1, thus making it possible to increase the payload and/or reduce the cost of launching the space- craft into orbit. The apparatus would include a track along which the spacecraft would ride on a sled. Hundreds...

Briefs : Mechanical & Fluid Systems
Modular, Highly Maintainable, and Flexible Control Software

Model Rocket Engine Software System (MRECS) is a system of control software that was originally intended for use in controlling rocket engines but is also applicable to almost any real-time, closed- loop process-control system — for example, the feedback control system of a robot....

Briefs : Manufacturing & Prototyping
Low-Plasticity Burnishing

Low-plasticity burnishing (LPB) has been devel- oped as an affordable means of imparting residual compressive stresses to surface layers of metal parts (especially engine components) in order to increase their fatigue lives. Heretofore, surface compressive stresses to enhance the fatigue lives have been produced,...