An improved method has been devised for fabricating micron-dimension Li features. This approach is intended for application in the fabrication of lithium-based microelectrochemical...

Briefs: Manufacturing & Prototyping
Manufacture of Regularly Shaped Sol-Gel Pellets

An extrusion batch process for manufacturing regularly shaped sol-gel pellets has been devised as an improved alternative to a spray process that yields irregularly shaped pellets. The aspect ratio of regularly shaped pellets can be controlled more easily, while regularly shaped pellets pack more...

An algorithm that effects fast lossless compression of multispectral-image data is based on low-complexity, proven adaptive filtering algorithms. This algorithm is intended for use in...

Briefs: Information Technology
Improved Solar-Radiation-Pressure Models for GPS Satellites

A report describes a series of computational models conceived as an improvement over prior models for determining effects of solar-radiation pressure on orbits of Global Positioning System (GPS) satellites. These models are based on fitting coefficients of Fourier functions of...

Briefs: Information Technology
Algorithms for Maneuvering Spacecraft Around Small Bodies

A document describes mathematical derivations and applications of autonomous guidance algorithms for maneuvering spacecraft in the vicinities of small astronomical bodies like comets or asteroids. These algorithms compute fuel- or energy-optimal trajectories for typical maneuvers by...

Practical Simulator Network (PSimNet) is a set of data communication protocols designed especially for use in handling messages between computers that are engaging cooperatively in...

Briefs: Information Technology
Statistical Detection of Atypical Aircraft Flights

A computational method and software to implement the method have been developed to sift through vast quantities of digital flight data to alert human analysts to aircraft flights that are statistically atypical in ways that signify that safety may be adversely affected. On a typical day, there...

Briefs: Information Technology
Developing Signal-Pattern-Recognition Programs

An automated system to assist a General Aviation (GA) pilot in improving situational awareness of weather in flight is now undergoing development. This development is prompted by the observation...

Briefs: Information Technology
NASA's Aviation Safety and Modeling Project

The Aviation Safety Monitoring and Modeling (ASMM) Project of NASA’s Aviation Safety program is cultivating sources of data and developing automated computer hardware and software to facilitate...

A process for fabricating thermoelectric modules with vacuum gaps separating the thermoelectric legs has been conceived, and the feasibility of some essential parts of the process...

The cryospheric advanced sensor (CAS) is a developmental airborne (and, potentially, spaceborne) radar based instrumentation system for measuring and mapping the thickness of sea ice....

Briefs: Physical Sciences
Measuring Attitude of a Large, Flexible, Orbiting Structure

A document summarizes a proposed metrology subsystem for precisely measuring the attitude of a large and flexible structure in space.

A proposed remote-sensing instrument, to be carried aboard a spacecraft in orbit around the Earth, would gather data on the spatial distribution and radiative characteristics of...

Briefs: Physical Sciences
Multimode-Guided-Wave Ultrasonic Scanning of Materials

Two documents discuss a method of characterizing advanced composite materials by use of multimode-guided ultrasonic waves. The method at an earlier stage of development was described in “High-Performance Scanning Acousto-Ultrasonic System” (LEW-17601-1), NASA Tech Briefs, Vol. 30, No. 3...

Briefs: Physical Sciences
Microscale Regenerative Heat Exchanger

The device illustrated in Figure 1 is designed primarily for use as a regenerative heat exchanger in a miniature Stirling engine or Stirling-cycle heat pump. A regenerative heat exchanger (sometimes...

Accelerometers used for shock and vibration measurement in extreme environments require special consideration in the design and manufacturing process. Certain...

A three-stage monolithic microwave integrated circuit (MMIC) W-band amplifier has been constructed and tested in a continuing effort to develop amplifiers as well as oscillators,...

A proposed improved method of externally controlled time multiplexing of the readouts of focal plane arrays of pairs of stacked quantum well infrared photodetectors (QWIPs) that...

Briefs: Software
Implementing Access to Data Distributed on Many Processors
A reference architecture is defined for an object-oriented implementation of domains, arrays, and distributions written in the programming language Chapel.
Briefs: Software
2D/3D Visual Tracker for Rover Mast

A visual-tracker computer program controls an articulated mast on a Mars rover to keep a designated feature (a target) in view while the rover drives toward the target, avoiding obstacles.

Several prior visual tracker programs have been tested on rover platforms; most require very small and...

Briefs: Software
Measurement and Controls Data Acquisition System

Measurement and Controls Data Acquisition System (MCDAS) is an application program that integrates the functions of two stand-alone programs: one for acquisition of data, the other for controls.

Briefs: Software
Adding Hierarchical Objects to Relational Database General-Purpose XML-Based Information Managements

NETMARK is a flexible, high-throughput software system for managing, storing, and rapid searching of unstructured and semi-structured documents. NETMARK transforms such documents from their original highly complex, constantly changing,...

Visible light is only one narrow band of the electromagnetic spectrum, and doesn't always tell scientists what they need to know. Infrared, which is...

Articles: Test & Measurement
30 Years of Test & Measurement

In celebration of the 30th Anniversary of NASA Tech Briefs, our features in 2006 highlight a different technology category each month, tracing the past 30 years of the technology, and continuing with a glimpse...

Techs for License: Semiconductors & ICs
Technique Measures Material Properties

Developed for quality control and wafer metrology in the semiconductor manufacturing market, this non-destructive technology may be highly adaptable to measuring material properties such as a...

This non-invasive technology enables accurate plant quality assessments before any physiological change is perceived by the naked eye. Plants, and plant parts, can be assessed at any stage of growth. The...

Articles
Building the Financials to Get Investors Interested

In our last article, we planned out the business chronologically; that is, what we expected to happen and when we thought it would happen. Now, we need to assign costs to the steps in that series of events and roll it up into a standard financial picture that investors, members of your board,...

NMeasurement Computing, Norton, MA, has released the USB-3101 analog data output device that is fully compatible with USB 1.1 and 2.0 ports. The full-speed device is supported under Microsoft(r) Windows(r)...

Charge coupled device (CCD) image sensors
e2v Technologies
Elmsford, NY
914-593-6841
www.e2v.com

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