Keyword: Historical reference

Briefs: Physical Sciences

A mathematical model of a three-dimensional mixing layer laden with evaporating fuel drops composed of many chemical species has been derived. The study is motivated by the fact...

Briefs: Medical

Since the advent of Micro Electro Mechanical Systems (MEMS) technology, microfabrication methods have been used to manufacture a wide range of miniature pumps. These...

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: Software
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: Information Technology

An improved approach to the mathematical modeling of feedback control of thermal networks has been devised. Heretofore software for feedback control of thermal networks has been developed by...

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: 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: Software
Postprocessing Software for Micromechanics Analysis Code

The Micromechanics Analysis Code Post-Processing (MACPOST) computer program is designed primarily to serve as an improved means of processing the output of the Micromechanics Analysis Code With Generalized Method of Cells (MAC/GMC) computer program. [MAC/GMC was described in "Comprehensive...

Briefs: Mechanical & Fluid Systems

The figure depicts the exterior appearance of a pistol-grip rotary power tool that can be used to turn a drill bit, wrench socket, screwdriver, or other tool bit clockwise or counterclockwise at a controlled...

Briefs: Electronics & Computers

Two airborne spectrum analyzers were developed for acquiring dynamic data, characterized by frequencies up to 25 kHz, from a hypersonic-crossflow-transition experiment aboard the...

Briefs: Mechanical & Fluid Systems
Comprehensive Micromechanics-Analysis Code (MAC/GMC)

Micromechanics Analysis Code With Generalized Method of Cells (MAC/GMC) is a comprehensive, user-friendly, efficient computer program that predicts the elastic and inelastic thermomechanical responses of continuous and discontinuous composite materials with arbitrary internal microstructures...

Briefs: Physical Sciences
Software for Predicting Behavior of a Pyrotechnic Actuator

A theoretical model that predicts the time-dependent behavior of a pyrotechnically actuated mechanism and a computer program that implements the model have been developed. The model and program are especially applicable to a pyrotechnic device known as the NASA Standard Initiator (NSI)....

Briefs: Robotics, Automation & Control
Development of Gear Technology and Theory of Gearing

A NASA Reference Publication discusses gear technology from mathematical and historical perspectives. Following a preface containing historical and philosophical observations, the first of three chapters presents mathematical details of the theory of gearing, including recent developments...

Briefs: Electronics & Computers

An application-specific integrated circuit (ASIC) has been developed as a prototype of neuroprocessors for real-time diagnosis and control of automotive engines. The application of...