Briefs: Physical Sciences
Solar Simulator for a Portable Solar-Absorptance Instrument

A special-purpose solar simulator includes (1) a tungsten lamp that serves as a gray-body radiator with a temperature of 3,200 K and (2) a mosaic of filters such that the filtered lamp output has the same normalized spectral irradiance as that of sunlight outside the atmosphere of the...

Briefs: Physical Sciences

A small, lightweight, low-power instrument, denoted a proton-transferreaction/ ion-mobility spectrometer (PTR-IMS) has been developed for detecting airborne organic compounds at...

Briefs: Physical Sciences
Quantum Mechanics of Harmonic Oscillator in External Fields

A report presents a theoretical study of a harmonic oscillator in homogeneous or nonhomogeneous externally applied electric and/or gravitational fields. The standard quantum-mechanical formalism for a simple harmonic oscillator, starting with the Hamiltonian and the associated creation...

Briefs: Mechanical & Fluid Systems
Algorithms for Collision Avoidant Formation Flying

A report discusses algorithms for realtime planning of translation paths of multiple spacecraft flying in formation. The algorithm takes account of requirements to avoid collisions while operating within resource constraints (e.g., not calling for an acceleration greater than maximum possible)...

Briefs: Mechanical & Fluid Systems
Integrated Colloid Thrusters for Microspacecraft

A report proposes the development of a microfabricated, integrated colloid thruster as a prototype of devices for propulsion and control of the attitudes of microspacecraft. (In a colloid thruster, a beam of positively charged, microscopic droplets is extracted electrohydrodynamically from a...

Briefs: Electronics & Computers
PCI Bridge to Instruments and Telecommunication Systems

A report describes a prototype system interface assembly (SIA) that performs the functions of a compact, radiation-hard application-specific integrated circuit (ASIC) to be built subsequently. The SIA ASIC would be installed in a spacecraft, where it would function as a peripheralcomponent...

Briefs: Physical Sciences
Effect of Gravitation on Noninteracting Trapped Fermions

A report presents a theoretical study of the thermodynamics of an ultralow-temperature gas of fermions that interact with a gravitational field and with an externally imposed trapping potential but not with each other. The gravitational field is taken to define the z axis and the trapping...

Briefs: Mechanical & Fluid Systems
Improvements in a Piezoelectrically Actuated Microvalve

A report discusses the continuing development of a normally closed, piezoelectrically actuated valve fabricated mostly by micromachining of silicon. The design and operation of the microvalve as described in the instant report are basically the same as those of the version described in...

Briefs: Mechanical & Fluid Systems
Low-Energy Transfer From Near-Earth to Near-Moon Orbit

A report presents a theoretical approach to designing a low-energy transfer of a spacecraft from an orbit around the Earth to ballistic capture into an orbit around the Moon. The approach is based partly on the one presented in “Low-Energy Interplanetary Transfers Using Lagrangian...

Briefs: Photonics/Optics

An optical system that utilizes visible light at nearly perpendicular incidence has been invented for use in testing the surface figures of nominally axisymmetric (paraboloidal,...

Briefs: Photonics/Optics
Making Digital Composite Images for Technical Illustration

A method of generating three-dimensional composite digital images can serve multiple purposes in technical illustration. The method was devised to accelerate and facilitate the design of new electric lights and receptacles for large buildings, and can just as well be applied to the...

Briefs: Photonics/Optics

A portable instrument denoted a phase-retrieval camera (PRC) is designed to enable the testing of large, lightweight optics in the presence of vibrations and atmospheric turbulence. The development...

Briefs: Photonics/Optics

The liquid-crystal phase-shifting shearing interferometer is a common-path interferometer based partly on a lateral-shear-plate interferometer. It bears a partial similarity to the...

Briefs: Photonics/Optics

The figure schematically depicts an apparatus for measuring strain at only one designated location on a structure. The apparatus is a fiber-optic phase-locked loop, wherein strain...

Briefs: Photonics/Optics

The efficiencies and thus the brightnesses of flat-panel projectors based on liquid-crystal devices (LCDs) and digital mirror devices (DMDs) would be increased by the combination of...

Briefs: Photonics/Optics
Multi-Screen-Image- and Catalog-Viewing Program

A computer program enables the single- or multi-screen display of multispectral, multiresolution images — especially astronomical ones — stored as sets of data that range upward in size from hundreds of gigabytes. In cases of multi-screen displays, the software synchronizes the screens so that...

Briefs: Photonics/Optics
Software Automates Processing of SAR Image Data

The Automated SAR Image Processor (ASIP) computer program increases the efficiency of production of scientifically useful imagery from raw synthetic-aperture-radar (SAR) image data. In the absence of ASIP, the processing of SAR data is a labor-intensive task, often involving supporting personnel,...

Briefs: Photonics/Optics

The term "COSMOWRAP" denotes a compact, stiff, remotely actuatable, lightweight, quick-release clamp that could be substituted for the larger, heavier, and more-difficult-to-use toggle-action...

Briefs: Electronics & Computers

A computer-based system, and a method built around the use of the system, have been developed to automate the acquisition, integration, and management of data that have been...

Briefs: Electronics & Computers
Mixed-Signal Driver ASIC for IEEE 1394 and I²C Buses

The IEEE 1394 and I2C Mixed-Signal Driver is one of two application-specific integrated circuits (ASICs) designed to function together as an interface among the following three digital-signal buses:

A peripheral component interface (PCI) bus; A high-speed serial data bus that...
Briefs: Electronics & Computers

Circuits for conditioning AC power supplied to computers are under development. A power conditioner of this type would be an interface between a conventional AC power line and a...

Briefs: Software
Program Injects Random Faults for Testing Computers

JIFI (Jet Propulsion Laboratory's Implementation of a Fault Injector) is a computer program for studying the ability of a computer to tolerate, detect, and/or recover from faults (that is, bit errors). JIFI affords the capability to inject faults into user-specified central- processing-unit...

Briefs: Electronics & Computers

A monolithic microwave integrated circuit (MMIC) has been designed to function as a low-power-consumption, low-noise amplifier (LNA) at frequencies from about 65 to about 110 GHz. This MMIC...

Briefs: Electronics & Computers

Monolithic integrated circuits (in particular, Schottky-diode-based frequency multipliers) that operate at frequencies as high as a few terahertz are being developed in a...

Briefs: Electronics & Computers

Capacitors in which the main dielectric layers are made from sintered nanocrystalline BaTiO3 have been fabricated and tested in an initially successful and continuing...

Briefs: Electronics & Computers

Millimeter-wave/microwave ablation (essentially, heating by use of millimeter-wave and microwave electromagnetic radiation) has been proposed as a means of treating atherosclerotic...

Briefs: Software
KPP — a Preprocessor for VHDL

KPP is a computer program that serves as a preprocessor for VHDL code. [“VHDL” signifies VHSIC Hardware Description Language, which is a language used by the United States Department of Defense for describing, designing, and simulating very-high-speed integrated circuits (VHSICs).] KPP is based on, and similar...

Briefs: Software
Software for Analyzing Valve-Actuator

A computer program assists engineers in analyzing data on the performances of actuators of fuel and oxidizer valves in the main engines of the space shuttle. The program could be adapted to similar use in other settings in which, as in the space shuttle, valve actuators are instrumented to provide data on...

Briefs: Software
Software for Network Processing of

The Electronic Portable Information Collection (EPIC) computer program is a computer system that processes work authorization documents (WADs). The EPIC System, which is also known as the Portable Data Collection System, comprises a central data server and portable data terminals. The central data server acts...

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