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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 in...
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 the...
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: Electronics & Computers
Sensor Webs
Sensor webs are developmental collections of sensor pods that could be scattered over land or water areas or other regions of interest to gather data on spatial and temporal patterns of relatively slowly changing physical, chemical, or biological phenomena in those regions. Each sensor pod would be a node in a data-gathering/...
Briefs: Electronics & Computers
Microplasmic Coating Shows High Resistance to Wear, Heat and Corrosion
The process of anodizing, or controlled oxidation, of aluminum and aluminum alloys is more than seven decades old. The primary intent of anodizing aluminum and aluminum-alloy parts is to protect the highly reactive surface against corrosion in aqueous environments, such as humid...
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: 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: 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 making...
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 burned...
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 digital...
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 models used in this...
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 estimated...
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...
Briefs: Photonics/Optics
Photomultiplier tubes (PMTs) have long been recognized as the detector of choice for very weak light detection. The high gain of the PMT, in excess of 10 ×106, makes it a useful...
Briefs: Mechanical & Fluid Systems
Accelerations of One Airplane in Wake Vortices of Another
Accelerations of one airplane encountering a vortex or pair of vortices in the wake of another airplane were computed in a parametric study. The approach taken in the study was to systematically investigate the effects of progressively more nearly complete descriptions of the interaction of...
Briefs: Information Technology
Automation Language for Managing Operations
Automation Language for Managing Operations (ALMO) is a computer program that assists a human operator at a central control station in monitoring and controlling a complex equipment system that includes multiple subsystems connected in a digital communication network. Still undergoing development, ALMO is...
Briefs: Electronics & Computers
An improved method of closed-loop synchronization of a radio receiver with the phase of a carrier signal modulated by Gaussian minimum-shift keying (GMSK) has been proposed....
Briefs: Software
A computer program provides capabilities for numerical simulation and analysis of the thermodynamic performance of aircraft or automotive gas turbine engines. The program was developed...
Briefs: Photonics/Optics
The prismatic phase shifter is a novel device that can be used to control the phase of a coherent beam of light. Phase shifting is becoming an integral function of most modern interferometric systems. Phase shifting can...
Briefs: Information Technology
A method to detect and to characterize the type of nonlinear dynamics in an aeroelastic system involves the utilization of information from wavelet processing of measurement data....
Briefs: Physical Sciences
Miniature ring-orbitron getter ion pumps have been proposed for supplying high vacuums to advanced scientific instruments expected to be developed in the next few years. Examples of such...
Briefs: Materials
Rechargeable lithium-ion electrochemical cells that contain anodes made from a mixture of graphite and carbon black have been found to perform better than do similar cells that contain anodes made...
Briefs: Physical Sciences
Using Rayleigh Scattering To Measure Spacecraft Attitude
Two reports describe a Rayleigh-scattering attitude sensor (RSAS) - an optoelectronic instrument for determining the orientation of a spacecraft. An RSAS comprises a telescope/video-camera/image-digitizer combination that is mounted on the spacecraft and that captures images of the limb of...
Briefs: Physical Sciences
Diagnosing Gas-Turbine-Like Combustion by Use of PLIF
A report describes experiments in which planar laser-induced fluorescence (PLIF) of hydroxyl radicals was used to study the structures of flames in burner test rigs (a flame-tube combustor and a sector combustor) under conditions like those in combustors of aviation gas-turbine engines. The PLIF...
Briefs: Software
Automotive interior noise has become a critical consideration for manufacturers. Many studies have shown that interior noise in a vehicle has a major impact on the customer's perception of...
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