Briefs: Information Technology

An improved algorithm for detecting gray-scale and binary templates in digitized images has been devised. The greatest difference between this algorithm and prior template-detecting algorithms stems from...

Briefs: Information Technology

Fast algorithms and the first complete and efficient circuits for implementing two quantum wavelet transforms have been developed in theory. The significance of this development...

Briefs: Physical Sciences
Study of Inertial and Gravitational Masses of a Boson

A report presents a theoretical study of the relationship between the inertial mass (mi) and gravitational mass (mg) of a self-interacting neutral scalar boson in a heat bath. The question of whether these masses differ arises in modern physics. In quantum field theory, the mass of a particle...

Briefs: Physical Sciences
Metal/Dielectric Color Filters for Flat Panel Displays

A report expands on the proposal described in “Low-Absorption Color Filters for Flat Panel Display Devices” (NPO-20435) NASA Tech Briefs, Vol. 23, No. 12 (December 1999), page 34. To recapitulate: The dye pixel color filters in a conventional liquid-crystal or other display device would...

Briefs: Physical Sciences
Multiphase-Flow Model of Fluidized-Bed Pyrolysis of Biomass

A report presents additional information about the subject matter of “Model of Pyrolysis of Biomass in a Fluidized- Bed Reactor” (NPO-20708) NASA Tech Briefs, Vol. 25, No. 6 (June 2001), page 59. The model is built on equations for the dynamics of three components — gas, sand, and...

Briefs: Motion Control

A system of electronic hardware and software has been developed as an experimental prototype of a visual interface between a human operator and a possibly remote one-arm...

Briefs: Motion Control
Software for Geometric Calibration of Video Cameras

A software library and set of programs largely automate the geometric calibration of video cameras. Developed especially for robotic vision systems, this software generates the information needed to determine the three-dimensional (3D) positions of objects that appear in two- dimensional (2D)...

Briefs: Mechanical & Fluid Systems

The figure depicts a mechanism that is capable of simultaneously rotating as many as six disposable bioreactor chambers about horizontal axes. The particular bioreactor chambers for...

Briefs: Mechanical & Fluid Systems

Tip fences have been invented to reduce the noise generated in the airflows about the high-lift systems (the flaps and slats) of airplane wings. Tip fences also afford an important...

Briefs: Photonics/Optics

Cells that contain thin, single-crystal films of photoresponsive organic materials [e.g., meta-nitroaniline (m-NA)] have been invented for use as nonlinear optics and especially as...

Briefs: Photonics/Optics

An optoelectronic oscillator with a nominal operating frequency of 11.763 GHz has been designed and constructed to demonstrate a technique for reducing the sensitivity of the...

Briefs: Photonics/Optics

The figure depicts an apparatus for measuring x-ray diffraction (XRD) and/or x-ray fluorescence (XRF) in a specimen of material. The specimen could be, for example, a standard XRD powder...

Briefs: Photonics/Optics

A proposed program of research would be oriented toward the development of fluorescent dyes for use in two-photon microscopy. Two-photon microscopy and its predecessor, one-photon microscopy, are...

Briefs: Photonics/Optics

A method of growing lattice-mismatched InxGa1-xAs epitaxial layers on InP substrates using intermediate buffer layers of...

Briefs: Electronics & Computers

Active-pixel integrated-circuit image sensors that can be programmed in real-time to effect artificial reconfigurable vision on demand have been developed and demonstrated. In...

Briefs: Mechanical & Fluid Systems

The Ultrabend bolt is a specially designed bolt instrumented with strain gauges (see figure) that are connected into twin Wheatstone-bridge circuits. The geometric arrangement of the...

Briefs: Physical Sciences

Improved fiber-optic transducers, denoted tiger fibers, have been proposed for sensing volatile compounds. Tiger fibers are so named because, as described below, their sensitive portions...

Briefs: Physical Sciences
Using Laser Diodes to Characterize Force and Pressure Sensors

A proposed method of characterizing microphones and other pressure and force sensors would exploit the temporally varying forces of impingement of amplitude-modulated light beams from inexpensive laser diodes. What makes the method likely to be practical is the surprising fact that...

Briefs: Mechanical & Fluid Systems

Efforts are underway to implement an improved design of the device described in "Normally Closed, Piezoelectrically Actuated Microvalve" (NPO-20782), NASA Tech Briefs, Vol. 25, No. 1 (January...

Briefs: Electronics & Computers

A relatively simple test circuit immediately and automatically provides indications of (1) the continuity (or the lack thereof) of the wires of a two-wire cable, plus (2) a short circuit (if any)...

Briefs: Electronics & Computers
Automated Detection of Streaks in Rocket-Engine Plumes

A high-speed observer (HSO) system comprising a high-frame-rate digital video camera and a high-speed computer that processes the camera output has been developed for use in monitoring the exhaust plume of the space shuttle main engine (SSME) during tests. The HSO system is designed to...

Briefs: Information Technology
Software for Analyzing Root Causes of Process Anomalies

Root Cause Analysis (RoCA) is a computer program that assists analysts in understanding the root causes of process anomalies. As used here, “process anomalies” includes incidents that have caused, or that can potentially cause, injuries to personnel, damage to facilities, abnormal...

Briefs: Mechanical & Fluid Systems
Program Computes Pointing Corrections for a Radiotelescope

TLC is a computer program that determines corrections for radiotelescopepointing errors associated with tilts and elastic deformations. These errors occur because for rotation in azimuth, a radiotelescope is mounted on wheels that move on a circular track that deviates from perfect...

Briefs: Information Technology
Ex — Software for Numerical Computation in Native Oberon

“Ex” is the name of a library of software modules from which one can rapidly develop prototype or production versions of efficient numerical-computation application programs in the Native Oberon programming environment. Mathematical constructs that can be represented and processed by...

Briefs: Materials

Annealing has been found to be an effective means of tailoring the height of a Schottky barrier between gold and gallium nitride. This finding offers promise for the development of...

Briefs: Materials
Ceramics Made From Wood

The term “ecoceramics” (a contraction of “environment-conscious ceramics”) denotes a class of ceramics made partly from wood-based products, which can include natural wood, sawdust, cardboard, and/ or paper. In addition to the environmental advantage of renewability of the carbonaceous ingredients, the concept of...

Briefs: Mechanical & Fluid Systems
Lightweight, Low-Backlash Robot Wrist With Epicyclic Drive

A unique lightweight wrist with three degrees of rotational freedom has been developed as a prototype of wrists for future anthropomorphic robots that would perform a variety of tasks on Earth and in outer space. The three degrees of freedom (two rolling, one bending) intersect at the...

Briefs: Mechanical & Fluid Systems
Ice-Melting Probe Using Steam and Jets of Hot Water

An improved probe has been proposed for burrowing vertically into ice for scientific exploration of polar icecaps, glaciers, and the like. The predecessor of the improved probe is a Philbert probe, which contains an electric heater to melt the ice in contact with it and thereby make it descend...

Briefs: Manufacturing & Prototyping
Two Techniques for Removing Core-Drill Debris

Two alternative techniques make it possible to remove core-drill debris more rapidly and efficiently than was previously possible. Either technique is a vast improvement over the prior art. For industries in which ultrasonic core drills are used, these two techniques are expected to result in savings...

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