Briefs: Information Technology
The Multi-Disciplinary Computing Environment (MDICE) is a software system for multidisciplinary analysis of complex engineering equipment, processes, and systems. Currently MDICE...
Briefs: Information Technology
Electronic Storage and Retrieval of Engineering Documents
The KSC Electronic Documentation System (KEDS) is a computer-intranet system at Kennedy Space Center (KSC) for the storage and retrieval of engineering drawings and other engineering documents that have been officially released. Prior to the development of the KEDS, microfilm copies of...
Briefs: Information Technology
Optimization Modeling Assistant (OMA) is an expert-system computer program that assists its users in the development of mathematical and algorithmic models for optimization. As used...
Briefs: Mechanical & Fluid Systems
The EXOS computer program numerically simulates impacts of orbital debris on spacecraft. EXOS can be used to simulate meteoroid- and orbital-debris-impact damage to commercial...
Briefs: Electronics & Computers
The figure schematically depicts a heterodyne photonic apparatus built around three continuous-wave, near-infrared diode lasers. This apparatus generates electromagnetic radiation...
Briefs: Electronics & Computers
Advanced unicouples that contain carefully tailored combinations of thermoelectric materials are being investigated in an effort to develop thermoelectric power generators that would operate with...
Briefs: Test & Measurement
A compact, portable, mid-infrared, laser-based instrument that operates at room temperature has been developed for use in detecting trace concentrations of CO or any of several other...
Briefs: Test & Measurement
Personal Cabin Pressure Alarm
Compact instruments, similar in appearance to common personal pagers, have been proposed for warning aircraft crewmembers that cabin air pressure has decreased to a potentially dangerous level. An instrument of this type, called a "personal cabin pressure monitor and warning system" (PCPMWS), implements a warning...
Briefs: Mechanical & Fluid Systems
Software Predicts Noise From Rotor-Wake/Stator Interactions
V072 is a computer program that predicts the noise generated by the interaction between the rotor-blade wake (fan wake) and the stator vanes of a turbofan engine. The program is a combination of subroutines from prior NASA programs, with many added features.
Briefs: Mechanical & Fluid Systems
Insulating tiles with interlocking shaped gaps have been developed for use in protecting the leading edges of the wings of aerospacecraft against excessive heating during hypersonic...
Briefs: Physical Sciences
A combination of procedure and equipment for loading liquid hydrazine into a spacecraft fuel tank that contains a diaphragm or bladder would be modified, according to a proposal....
Briefs: Physical Sciences
Ultrasonic Bubble-Sizing Instrument
An ultrasonic instrument has been developed for measuring the sizes of bubbles in the human body. A primary example is that of bubbles associated with decompression sickness (the "bends"); these bubbles consist mostly of nitrogen and can occur in both blood vessels and extravascular tissues. The bubbles can...
Briefs: Information Technology
A recently developed theoretical and computational method is especially well suited for analyzing time-series data that represent nonstationary and nonlinear processes. The method stands in...
Briefs: Materials
A method of fabricating composites of pretreated silicon carbide fibers in silicon carbide matrices provides for the formation of improved boron nitride fiber/matrix interfacial layers....
Briefs: Motion Control
A proposed solenoid-actuated valve would open for a short time to pass a very small quantity of fluid. The valve could be used to meter a specified total quantity of the fluid through repeated...
Briefs: Electronics & Computers
Making Submicron Features by Ion Etching Through PMMA Masks
Experiments have shown that a substrate can be patterned with submicron features by the following procedure:
Briefs: Materials
Reactive-Ion Etching of Smooth Vertical Walls in Silicon
An advanced technique of deep reactive-ion etching (DRIE) has been developed for fabricating smooth vertical walls in silicon wafers. These walls are suitable for use as bounding surfaces of optical waveguides in photonic and optoelectronic devices. The roughness of a typical 8-µm-high...
Briefs: Motion Control
The figure presents a simplified and partly schematic view of a two-stage rolling-piston compressor that is undergoing development for use as the prime mover in a vapor-compression...
Briefs: Electronics & Computers
A developmental apparatus and process for the fabrication of photonic devices utilize intense, focused laser light projected and/or diffracted in controlled patterns. The apparatus and process can...
Briefs: Motion Control
Formulation and Algorithm for Multi-Flexible-Body Dynamics
An improved formulation of the dynamics of multiple flexible bodies coupled via joints, and an algorithm that implements the formulation, have been developed at Johnson Space Center (JSC). A robot arm with multiple, somewhat flexible links is a prime example of a dynamic system to which...
Briefs: Electronics & Computers
In today's manufacturing world, the need for ultraprecise position measurement and control grows as feature sizes shrink in the semiconductor industry and the world of...
Briefs: Motion Control
Myoelectric Teleoperation for Robotics and Prosthetics
Johnson Space Center is sponsoring continuing research on the use of myoelectric signals to control dexterous robotic and prosthetic hands. This research is expected to advance the state of the art beyond that of today's most common, commercially available, myoelectrically controlled...
Briefs: Electronics & Computers
Microelectromechanical single-pole, double-throw (SPDT) switches with predominantly planar configurations have been proposed for use in radio-frequency (RF) circuits. These switches would have overall...
Briefs: Mechanical & Fluid Systems
A Rankine-cycle engine that contains a binary working fluid (ammonia + water) and a recuperative heat exchanger has been built and tested. This engine is a prototype of...
Briefs: Mechanical & Fluid Systems
Magnetic Couplings for Gas-Driven Catapults
A proposed magnetic-coupling scheme would afford additional degrees of freedom to optimize the designs of gas-driven catapults or launchers. The scheme could be applied to gas guns in diverse applications, including launching spacecraft or aircraft, propelling various objects at high speeds along the...
Briefs: Mechanical & Fluid Systems
A relief valve has been designed to limit the differential pressure between two fluids that are not allowed to be mixed. This valve offers advantages over both simple check valves and simple relief valves....
Briefs: Mechanical & Fluid Systems
Systems for Dynamic Control of Growth of Protein Crystals
Computer-controlled laboratory apparatuses for real-time monitoring and control of the growth of protein crystals are undergoing development. By use of an apparatus of this type, one can monitor and control several parameters that affect the growth of protein crystals; these parameters...
Briefs: Physical Sciences
Spaceborne Telescope for Communication, Ranging, and Imaging
A report describes a program to develop a multi-function telescope to be carried aboard spacecraft of the planned X2000 series of planetary missions. [A related multi-function telescope was described in "Telescope for Imaging and Laser Communication" (NPO-20388), NASA Tech...
Briefs: Physical Sciences
Dislocation-Induced Changes in InxGa1 -xAs Quantum Dots
A report describes an experimental investigation that revealed a previously unknown type of spatial alignment of quantum dots (QDs) in InxGa1 -xAs/GaAs multilayer structures. Multilayer arrays of QDs (in the form of nanometer-sized...
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