July 2001

Briefs : Photonics/Optics
Fractal-Based Encryption

In 1987 a discovery led to the formal proof that it is possible to use chaotic functions to arrive at a nonprobabilistic and nondeterministic method normal context of the operation of this system, and by using a virtual operational environment, the investigators are manipulating data in eight dimensions, which require a...

Briefs : Information Technology
Coherent Phase Line Enhancer: a Method of Spectral Analysis

The term "coherent phase line enhancer" (CPLE) refers to a dual-transform method of spectral analysis that enhances the detection of periodic and quasi-periodic signals buried in wide-band noise. The CPLE is particularly useful for increasing the signal-to-noise ratios of spectral peaks...

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 : Software
Software for Real-Time Transfer of GPS Data Over the Open Internet

Real-Time Net Transfer (RTNT) software allows for efficient and reliable transport of raw, GPS (Global Positioning System) observables over the open Internet. Efficiency is achieved by editing and compressing the GPS observables at the remote site, and by using User Datagram...

Briefs : Electronics & Computers
System Processes Data From Wind-Tunnel Acoustic Measurements

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 measurements of acoustic sources, including low signal-to-noise sources not measurable by conventional techniques....

Briefs : Information Technology
Common Database Interface and Report Generator

The Common Database Interface and Report Generator is a computer program that serves as both (1) a single common interface for data-base application programs to gain access to local or remote data bases by use of Structured Query Language (SQL) operators and (2) a report generator.

Briefs : Software
Software for Displaying Coregistered Sets of Data

The DataSlate computer program is being developed to help educators and students gain access to, view, manipulate, and otherwise interact with sets of planetary and other scientific data via the Internet or via local data-storage facilities. DataSlate will be especially useful for displaying...

Briefs : Electronics & Computers
The Wireless Augmented Reality Prototype Concept

The Wireless Augmented Reality Prototype (WARP) is a system for personal access to a local area network with video, audio, and sensor data services. The center of the WARP system is a lightweight, unobtrusive heads-up display with a wireless wearable control unit, called the Remote Access Unit...

Briefs : Electronics & Computers
MQW Based Blocked Intersubband Detector for Low-Background Operation

Multiple-quantum-well (MQW) AlxGa1-xAs/GaAs infrared photodetectors that are better suited [relative to prior AlxGa1-xAs/GaAs quantum-well infrared photodetectors (QWIPs)] for operation under low-background conditions are undergoing...

Briefs : Electronics & Computers
Airfield Wind Advisory Systems for General Aviation

An Airfield Wind Advisory System (AWAS) includes a self-contained weather station, located at an airfield, that measures speed and direction of the wind, the temperature, the barometric pressure, and the humidity. This ground station digitizes these measurements and transmits the measurement...

Briefs : Software
Computing Radiation Fluxes, Power, and Temperature for TOPEX

A computer program performs a unified analysis of the radiation exposure, the temperatures, and the power generation and distribution for predicting the performance of the TOPEX satellite on orbit and during maneuvers. The unified analysis is needed because all aspects are...

Briefs : Software
Program for Updating Parameters of Thermal Models

Parameter Identification in Thermal Networks (PITN) is a computer program developed to satisfy a need to update parameters in mathematical models of thermal systems in order to make the temperatures computed by the models equal to the temperatures measured in tests of the corresponding real...

Briefs : Software
Program Tracks Operation of a Remote Solid-State Recorder

Solid State Recorder Pointer Tracker (SSRPT) is a computer program developed specifically to aid ground-based monitoring and control of two redundant solid-state recorders (SSRs) aboard the Cassini Spacecraft. The SSRs store telemetry data until downlink times, which are limited to a...

Briefs : Software
Library for Developing Spacecraft-Mission-Planning Software

The Platform Independent Software Components for the Exploration of Space (PISCES) software library provides for web-based, collaborative development of computer programs for planning trajectories and other trajectory-related aspects of spacecraft-mission design. The PISCES...

Briefs : Mechanical & Fluid Systems
Lightweight, Collapsible Hyperbaric Chamber With Airlock

A lightweight, collapsible hyperbaric chamber/airlock system has been proposed as a portable unit for treating decompression sickness. Copies of the system could be stowed compactly and deployed when needed in settings in which decompression sickness is expected to occur occasionally but...

Briefs : Mechanical & Fluid Systems
Reconfigurable Exploratory Robotic Vehicles

A family of rugged, modular, reconfigurable, instrumented robotic vehicles has been proposed for use in exploration of the surfaces of Mars and other remote planets. These or similar vehicles could also be useful in such diverse terrestrial applications as exploration of volcanic craters or other...

Briefs : Medical
Engineered Bioremediation of Contaminated Soil

Electrokinetically enhanced bioremediation (EEB) is a method of engineered bioremediation of soil contaminated by such organic compounds as solvents and petroleum products. As depicted schematically in the figure, EEB involves the utilization of controlled flows of liquids and gases into and out of...

Briefs : Medical
Microgravity Tissue Engineering

A continuing program of research and development focuses on engineering of functional cartilage and cardiac muscle for scientific research and for eventual use in transplants. The program involves the use of cells, polymer scaffolds, and bioreactor vessels. A polymer scaffold serves as a three-dimensional...

Briefs : Photonics/Optics
Apparatus for Time- and Wavelength-Resolved Spectroscopy

An apparatus that includes a pulsed electron gun and a high-resolution ultraviolet spectrometer has been developed for use in (1) pulsed electron-impact excitation of transitions among the electron-energy states in a gas and (2) measurement of the spectrum of the resulting ultraviolet...

Briefs : Photonics/Optics
Infrared Sensors for Detecting Icing on Helicopter Blades

Infrared-sensor systems for real-time detection of accretion of ice on helicopter rotor blades are undergoing development. By providing early warnings of icing conditions, these systems would enable pilots to activate deicing equipment or take other corrective action to avoid the severe...

Briefs : Photonics/Optics
Back-Illuminated CCDs With Integral Ultraviolet-Pass Filters

Efforts are under way to develop back-surface-illuminated, thinned silicon charge-coupled devices (CCDs) with delta doping and integral optical filters to be used as image detectors in the ultraviolet wavelength range. The concept of delta doping of back-surface-illuminated, thinned...

Briefs : Photonics/Optics
Capture and Escape of Charge Carriers in Quantum Dots

A report describes an experimental investigation of effects of thermally induced intermixing of In0.6Ga0.4As and GaAs on the dynamics of photoexcited charge carriers in In0.6Ga0.4As/GaAs quantum dots. The quantum dots (nanometer-size islands of...

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 : Photonics/Optics
Common-Path Heterodyne Interferometers

Common-path heterodyne interferometers (COPHIs) have been proposed for measuring small variations in the heights of surfaces. A COPHI could be used, for example, to measure the deviation of the surface of a mirror or other optical component from nominal flatness or nominal sphericity. Like phase-shifting...

Briefs : Photonics/Optics
Shared-Aperture Multiplexed Holographic Scanning Telescopes

Shared-aperture multiplexed holographic scanning telescopes have been proposed for use in lidar transceivers and other laser transmitters and receivers in remote sensing instruments. Examples of instruments that could incorporate the proposed telescopes include airborne terrain...

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