Briefs: Robotics, Automation & Control
Modifications of the Ventricular Assist Device

A report discusses some modifications of the ventricular assist device (VAD), which was described in "Small Implantable Pump Would Assist Circulation of Blood" (MSC-22424), NASA Tech Briefs, Vol. 20, No. 7 (July 1996), page 86. The VAD is a surgically implantable, miniature rotary pump designed to...

Briefs: Motion Control
Biomorphic Robot With Distributed Power

The biomorphic robot with distributed power (BIROD) is a prototype of a class of robots that will contain simple, reliable distributed actuators that will consume power from local sources - a design concept inspired in part by biological actuators like muscles in limbs. The BIROD concept stands in...

Briefs: Manufacturing & Prototyping

Heated weights have been found to be useful in adhesive bonding of clips, doublers, and other small parts to lightweight structures and structural components (e.g., face-sheet/honeycomb-core sandwich...

Briefs: Electronics & Computers
Improved Lightning-Current Measurements on a Protective Wire

A test procedure has been devised to increase the accuracy with which lightning currents on a protective wire can be determined from raw current measurements. The procedure was conceived specifically for determining lightning currents on a steel cable used to protect the space shuttle...

Briefs: Software
Program Generates Maps From IFSAR Data

A computer program provides for automated generation of maps from data acquired via C-band interferometric synthetic-aperture radar (IFSAR). The program reads in height, radar-brightness, and correlation data generated by IFSAR processors and computes a series of image features to be used in classifying...

Briefs: Robotics, Automation & Control

A program of flight testing of an instrumented subscale model of the X-33 aerospace vehicle is underway. The objectives of this program are the following:

Briefs: Electronics & Computers

A low-power serial data communication link has been designed to transmit data among subsystems of a spacecraft instrumentation system, at rates up to 5 × 105 bits per...

Briefs: Motion Control

A fault-tolerant feedback (FTF) system has been integrated into a robot control system to prevent robot-arm runaways that could be caused by failure of one or more transducers such as...

Briefs: Materials

Lightweight, monolithic ceramics that retain their shapes and strengths and resist oxidation at temperatures up to 1,200 °C have been invented. These ceramics are made of carbon, silicon,...

Briefs: Mechanical & Fluid Systems

Kinetic-energy-absorbing shrouds have been proposed to protect nearby persons and equipment against high-speed debris ejected by disintegrating machines. Examples of machines that...

Briefs: Electronics & Computers

Focal-plane arrays of active-pixel sensors (photodetectors integrated with in-pixel readout transistors) would be designed and fabricated within the emerging technological discipline of...

Briefs: Electronics & Computers

Capacitive proximity sensors of this proposed type would be based on the capaciflector concept, with an extension of hardware and software designs to incorporate capabilities for scanning in frequency and...

Briefs: Electronics & Computers
Evolvable Multiagent Approach to Spacecraft Communication

A paper presents the concept of a system for autonomous communication among multiple satellites and other spacecraft. The design of the system would be based on an evolvable architecture of multiple intelligent agents (that is, artificial-intelligence constructs implemented in software...

Briefs: Electronics & Computers

The Army Research Laboratory (ARL) has developed a new method of measuring human physiological stress parameters. This consists of an acoustic sensor positioned inside a fluid-filled bladder...

Briefs: Electronics & Computers

Integrated circuits capable of sensing both infrared and visible images have been proposed. Until now, the usual practice for simultaneous imaging at both infrared and visible wavelengths in...

Briefs: Electronics & Computers

A recently developed gallium nitride-based linear array of ultraviolet detectors is blind to most of the visible spectrum, with a cutoff wavelength of 370 nm. This device is a prototype of GaN...

Briefs: Mechanical & Fluid Systems

Equations have been derived to describe the deflection of a circular membrane under both in-plane and transverse loads. More specifically, the equations describe the radial (in-plane)...

Briefs: Software
Program for Designing Multiple-Reflector Antenna Systems

Millimeter-Wave Optics Design Tool (MOD Tool) is a computer program for analyzing and designing multiple-reflector antenna systems that operate at microwave and millimeter wavelengths. MOD Tool is intended for use in conjunction with a computer-aided-design (CAD) program along with other...

Briefs: Materials

Electrodialysis has been shown to be an effective means for removing ammonium ions from wastewater without use of consumable chemicals and without adding other substances to the treated...

Briefs: Mechanical & Fluid Systems

"Hybrisol" denotes a proposed rocket engine that would contain hybrid and solid-propellant parts within a single combustion chamber. ["Hybrid" as used here denotes a type of rocket engine in which a solid fuel is...

Briefs: Mechanical & Fluid Systems

A mixing apparatus combines liquid oxygen and liquid nitrogen to make liquid air in small, convenient quantities. Heretofore, equipment used to make liquid air by mixing was incapable of...

Briefs: Physical Sciences

Color-filtering and beam-scanning devices based on electro-optical switching of internal-reflection states have been proposed for use in display and measurement applications. Associated...

Briefs: Electronics & Computers

The JGOAL collection of computer programs facilitates the real-time display, via the Internet, of multiple streams of data from the space shuttle and its ground support equipment at...

Briefs: Physical Sciences
Evaporation of Isolated and Collections of Fluid Drops Under Supercritical Conditions

A report presents a computational study of heat and mass transfer for isolated and interacting drops of one fluid (liquid O2) immersed in another fluid (H2) in finite, quiescent surroundings under supercritical conditions. The mathematical...

Briefs: Information Technology

A method of smoothing and edge detection in digitized images involves the use of a Gaussian smoothing filter that is adaptive in the sense that the filter scale varies with the...

Briefs: Robotics, Automation & Control
Gimbaled Injectors for Testing Spacecraft Thrusters

A report proposes an assembly of gimbaled valve/nozzle subassemblies for use in injecting either a propellant fluid (e.g., monomethyl hydrazine) or a propellant-simulating fluid (e.g., water) into the combustion chamber of a spacecraft thruster during hot-fire or cold testing, respectively. The...

Briefs: Photonics/Optics
Hybrid Imaging Technology

"Hybrid imaging technology" (HIT) is the name of a discipline in which the advancement of electronic image sensors is pursued via hybridization of charge-coupled-device (CCD) and complementary metal oxide/semiconductor (CMOS) circuitry. The guiding principle of HIT is to combine CCD and CMOS components into units that...

Briefs: Physical Sciences

An improved array of microcalorimeters has been devised for use as photon detectors in an x-ray spectrometer for astrophysical research. The spectrometer will be used to measure the spectra of...

Briefs: Photonics/Optics
High-Speed Image Detectors With Subelectron Noise Floors

Parallel ultra-low-noise hybrid detectors (PHUDs) are developmental image-detector devices for use in low-power, scientific-grade video cameras. The hybrid nature of a PHUD lies in the incorporation of both charge-coupled-device (CCD) image-detection circuitry and complementary metal...

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