Keyword: Technical review

Briefs: Mechanical & Fluid Systems
Analysis of Designs of Space Laboratories

A report presents a review of the development of laboratories in outer space, starting from the pioneering Skylab and Salyut stations of the United States and the former Soviet Union and progressing through current and anticipated future developments. The report includes textual discussions of...

Briefs: Software

Manufacturing companies must bring high-quality products to market faster than ever before. This tightened timeframe significantly impacts the manufacturing supply chain — a familiar...

Briefs: Information Technology
Self-Supervised Dynamical Systems

Some progress has been made in a continuing effort to develop mathematical models of the behaviors of multi- agent systems known in biology, economics, and sociology (e.g., systems ranging from single or a few biomolecules to many interacting higher organisms). This effort at an earlier stage was reported in...

Briefs: Physical Sciences
Software for Tracking Costs of Mars Projects

The Mars Cost Tracking Model is a computer program that administers a system set up for tracking the costs of future NASA projects that pertain to Mars. Previously, no such tracking system existed, and documentation was written in a variety of formats and scattered in various places. It was difficult...

Briefs: Mechanical & Fluid Systems

A mechanical amplifier has been devised to multiply the stroke of a piezoelectric transducer (PZT) intended for use at liquid helium temperatures. Interferometry holds the key to high...

Briefs: Software
The Technical Work Plan Tracking Tool

The Technical Work Plan Tracking Tool is a web-based application that enables interactive communication and approval of contract requirements that pertain to the administration of the Science, Engineering, Analysis, and Test (SEAT) contract at Johnson Space Center. The implementation of the application has...

Briefs: Information Technology
Characteristics of Dynamics of Intelligent Systems

An investigation of nonlinear mathematical models of dynamics has led to the selection of characteristics that could be useful for distinguishing mathematically between the behaviors of (1) intelligent or living systems and (2) nonliving systems. As contemplated here, an intelligent or living...

Briefs: Physical Sciences

Scanning thermography is a noncontact, nondestructive technique that makes it possible to find defects hidden inside structural components in a variety of settings. Scanning thermography can be used to perform...

Briefs: Robotics, Automation & Control

Figure 1 depicts a mechanical linkage that converts rotational motion about three base joints (A, B, and C) to translational motion of an end effector (D) in three dimensions. The linkage...

Briefs: Software
Training by Use of Games Played via the Internet

A software system that resides on a server delivers training via the Internet to users of client computers. Admin- istrators can also interact with the system via client computers. The training lessons are in the form of trivia games, which are implemented by a game-engine software subsystem that...

Briefs: Electronics & Computers

The synthesis of some fuzzy-logic circuits by use of evolvable hardware (EHW) has been demonstrated in an investigation of EHW as a means of auto- mated synthesis of...

Briefs: Information Technology
Update on Web Interactive Training

The Web Interactive Training (WIT) project at Kennedy Space Center has expanded its course offerings, enhanced its technical capabilities, and automated its administrative functions. Aspects of the WIT project at previous stages of development were reported in “Further Developments in Web Interactive...

Briefs: Information Technology
Initialized Fractional Calculus

The fractional calculus (which admits of integrals and derivatives of non-integer order) dates back almost to the origin of the better-known ordinary (integer-order) calculus, but thus far has been treated more as a mathematical curiosity than as a scientific and engineering tool. Increasingly many physical...

Briefs: Software
Software for Capturing Software-Design Rationale

Better Elicitation and Communication of Arguments Underlying Software Engineering (BECAUSE) is a computer program that records and codifies the rationale that underlies decisions made in the course of developing software. To minimize the additional sensory, cognitive, and motor demands upon the...

Briefs: Information Technology
Wavelet-Based Time-Varying Models of Pilots in Control Loops

A report presents a study of the use of wavelet-based mathematical models to quantify the responses of humans in control loops. The report begins with a review of the traditional representation of manual control responses by use of transfer functions derived from Fourier transforms,...

Briefs: Information Technology
Beacon-Based Exception Analysis for Multimissions

BEAM is a method of real-time, automated analysis and diagnosis applicable to a broad class of complex electromechanical systems, including spacecraft, aircraft, and process-control systems. Some aspects of its operation were described in “Reusable Software for Autonomous Diagnosis of Complex...

Briefs: Electronics & Computers
“Morphing” in Evolutionary Synthesis of Electronic Circuits

A method of automated evolutionary synthesis of electronic circuits has been augmented by a concept called “morphing through fuzzy topologies.” Previous versions of the method provided for the evaluation of “crisp” topologies were precisely specified by open/closed (on/off)...

Briefs: Electronics & Computers

A method of automated synthesis of analog and/or digital electronic circuits involves evolution in both software simulations and hardware. Heretofore, the evolutionary auto- mated...

Briefs: Electronics & Computers

A method of automated synthesis of analog and/or digital electronic circuits involves evolution, either in software simulations or in hard- ware, directly on integrated-circuit chips....

Briefs: Software
Software for Parallel Processing of Telemetry

Parallel Telemetry Processor (PTEP) is a high-speed, robust, extensible, Javalanguage computer program that (1) enables the parallel processing of a serial stream of telemetric data and (2) generates a graphical display for monitoring the processing. Originally intended for application to spacecraft...

Briefs: Information Technology
Mathematical Model of a Quantum Decision Maker

A mathematical model of a quantum analog-computing device that would simulate the human decision-making process has been developed. Like the immune-inspired- computing model described in the preceding article, this model is intended to contribute to improvement in the autonomy of robots and...

Briefs: Electronics & Computers

The TAXI Direct-to-Disk interface is a special-purpose interface circuit for demultiplexing of data from a Racal Storeplex (or equivalent) multichannel recorder onto...

Briefs: Information Technology
Self-Organization Based on Quantum Entanglement

A report presents a theoretical study of communication among intelligent agents in the presence of quantum entanglement and the absence of classical (in the sense of non-quantum) communication channels. Several paradigms of self-organization based on quantum entanglement are introduced and...

Briefs: Software
Advanced Software for Two-Phase Thermohydraulic Systems

Recent improvements in the SINDA/FLUINT computer program have made the program into a highly capable, commercially viable software product for general mathematical modeling of thermohydraulic systems. Versions of SINDA/FLUINT have been described in a number of previous NASA Tech Briefs...

Briefs: Information Technology
Software for Secure Distribution of Data

MECS is a computer program for the automated, secure, rapid, and efficient transfer of data between a central source and users at multiple distant locations. "MECS" signifies "Multi-mission Encrypted Communication System." MECS enables many users to collaborate securely on a shared plan or set of...

Briefs: Electronics & Computers

A processing system has been developed to meet increasing demands for detailed noise measurement of aircraft in wind tunnels. Phased arrays enable spatial and amplitude...

Briefs: Photonics/Optics
Rayleigh-Scattering Measurements in Underexpanded Jets

A report describes experiments in which time-averaged and unsteady local variations in the densities of underexpanded supersonic free jets issuing from a choked circular nozzle were measured by laser-induced Rayleigh scattering. This study is part of a continuing effort to understand the...

Briefs: Electronics & Computers

Very-large-scale integrated (VLSI) circuits containing electronically reconfigurable arrays of transistors have been proposed as means to implement a forthcoming generation of a...

Briefs: Photonics/Optics

Recent research has demonstrated the feasibility of an all-optical method of recording and readout of holograms in photorefractive crystals, with capabilities for both nonvolatile...

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