Keyword: Electrical systems

Briefs: Electronics & Computers

A biotelemetric system for monitoring key physiological parameters of a fetus and its uterine environment is undergoing development. The main purpose of the monitoring is to detect...

Briefs: Energy

Studies of physical and chemical effects in the hydride-forming electrodes of rechargeable nickel/metal hydride electrochemical cells have yielded results that now guide...

Briefs: Robotics, Automation & Control

Early experiments in a continuing research program have demonstrated that thermal batteries made from powdered solid electrode and electrolyte materials can be improved by use of smaller...

Briefs: Robotics, Automation & Control

According to a proposal for small electric-power systems that must operate in cold environments, heat released in the operation of solar photovoltaic arrays with solar concentrators would be...

Briefs: Electronics & Computers

Improved electrical connections have been developed for thin-film thermocouples used to measure temperatures on the surfaces of ceramic-matrix composite-material specimens during...

Briefs: Mechanical & Fluid Systems
Using Genetic Algorithms in Spacecraft Vibration Control

Three software products are being developed to help satisfy the needs of NASA and of private industry for reconfigurable active control systems to suppress vibrations in Reusable Launch Vehicles (RLVs) and other structures. These potentially highly marketable products are the...

Briefs: Materials

An improved method of synthesis of crystalline tin monoxide (SnO) powder for use in anodes of lithium-ion electrochemical power cells has been developed. The carbon used in anodes...

Briefs: Electronics & Computers
Snapshot CCD Camera With Microelectromechanical Shutter

A proposed charge-coupled-device (CCD) camera would be mechanically shuttered by a planar array of micromachined, electromechanically actuated shutters. This proposal has arisen as part of the solution to the problem of designing a visible/near-infrared imaging spectrometer using a...

Briefs: Electronics & Computers

Spectrum would be utilized more efficiently than in CDMA and FDMA.

Briefs: Electronics & Computers

A dc-to-dc switching power converter of the three-level, pulse-width-modulated, buck type has been designed, built, and verified to operate at temperatures from ambient down to -196 °C...

Briefs: Electronics & Computers

Interdigital overlay capacitors have been invented to decrease the amount of integrated-circuit chip area needed to accommodate a given amount of capacitance. In most very-large-scale...

Briefs: Physical Sciences
Optoelectronic Liquid-Level Gauges for Aircraft Fuel Tanks

Gauges that would measure liquid levels optically have been proposed for use in aircraft fuel tanks. These gauges would contain no moving parts (no floats) and no wiring inside the tanks. Their overall function could be characterized as that of permanently immersed, self-reading...

Briefs: Electronics & Computers
Prolonging the Lives of Rechargeable Lithium-Ion Cells

Several modifications of the design and operation of lithium-ion rechargeable electrochemical cells have been proposed to prolong the cycle lives of the cells. As explained below, overdischarge can result in dissolution of a metal current collector in the anode of a cell, with consequent...

Briefs: Electronics & Computers

A prototype mixer designed for operation at input frequencies near 2.5 THz incorporates a planar Schottky-barrier diode and a radio-frequency (RF) filter that are parts of an integrated...

Briefs: Electronics & Computers

Reflective flat-panel color display devices based on surface plasmons are undergoing development. Heretofore, no reflective flat-panel color display devices have been available. The active...

Briefs: Physical Sciences
Shape-Memory-Alloy Thermal-Conduction Switches

Variable-thermal-conduction devices containing shape-memory-alloy (SMA) actuators have been proposed for use in situations in which it is desired to switch on (or increase) thermal conduction when temperatures rise above specified values and to switch off (or decrease) thermal conduction when...

Briefs: Software
Program Simulates Performance of a Hybrid Automobile

The Hybrid Electric Vehicle Analysis (HEVA) computer program numerically simulates the performance of an automotive vehicle -- especially a hybrid vehicle. A vehicle is said to be hybrid if (1) it contains an energy-storage device (a battery, flywheel, or ultra-capacitor) that is charged with...

Briefs: Electronics & Computers

Improved pulsed inductive plasma accelerators are undergoing development for use as long-life thrusters for propulsion of spacecraft on interplanetary missions and for maneuvering...

Briefs: Materials

The anode separators in rechargeable lithium-ion electrochemical cells that contain carbon lithium-intercalating anodes with copper current collectors would be modified, according to...

Briefs: Test & Measurement

Sponsored by a NASA Small Business Innovation Research (SBIR) Phase II contract, MetroLaser, Inc., has developed a novel, compact and low-cost laser Doppler vibrometer (LDV) under...

Briefs: Test & Measurement
Software for Automated Retesting of Electrical Connections

The Shuttle Connector Analysis Network Automated Electrical Retest Operations (SCAN/AERO) computer program assists in the tracking, management, and automation of the retesting of electrical connectors on the space shuttle orbiters. Among other things, SCAN/AERO analyzes test data to...

Briefs: Materials

Several modifications of the basic design of carbon lithium-intercalating anodes with copper current collectors in rechargeable lithium-ion electrochemical cells have been proposed. These...

Briefs: Test & Measurement

The figure illustrates a silicon micromachined accelerometer currently under development that is designed specifically for seismologic applications. The device is designed for a sensitivity of...

Briefs: Mechanical & Fluid Systems

Latching devices have been developed to provide electrical connections, secure mechanical and thermal connections, and optical alignment for mounting electronically controlled...

Briefs: Electronics & Computers

Circuits to generate analog or digital representations of the coordinates of the centers of mass of images would be added to imaging photodetector arrays of the active-pixel-sensor...

Briefs: Physical Sciences

Microfabricated, silicon-based capacitive actuator/sensor devices have been developed as prototypes of compact, low-power transducers that would be used to detect the presence (and perhaps eventually measure the...

Briefs: Electronics & Computers

Modules of electronic circuitry that perform the amplitude- and phase-control and the status-monitoring functions for eight-element (2 ×4) subarrays of K-band phased-array antennas...

Briefs: Mechanical & Fluid Systems

A two-body design has enabled an instrumented penetrator projectile to function with increased tolerance to initial misalignment among (a) the longitudinal axis of the penetrator, (b) the...

Briefs: Electronics & Computers

An information-reduced carrier-synchronization (IRCS) system has been proposed for use in a coded binary-phase-shift-keying (BPSK) radio-communication receiver...