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Briefs: Physical Sciences
Inflatable Fresnel Lenses as Concentrators for Solar Power

Inflatable Fresnel lenses are being developed for use as optical concentrators in solar power systems. These lenses are of two types: dome (point-focus) lenses and cylindrical (line-focus)...

Briefs: Physical Sciences
Hybrid Acoustic/Electrostatic Levitation Apparatus

The figure schematically illustrates a developmental automated hybrid acoustic/electrostatic apparatus for levitating both electrically charged and electrically neutral liquid drops with sizes up...

Briefs: Physical Sciences
Low-Distortion Imaging Spectrometers

"Pushbroom" imaging spectrometers of a proposed type would exhibit little or no distortion in either the spectral or spatial direction. These spectrometers would feature modified Offner optics, which afford a...

Briefs: Physical Sciences
Evaluation of Exhaust Flows From Thrust-Vectoring Nozzles

A unique dual-flow, cold-jet facility has been developed and operated by California Polytechnic State University (Cal Poly) at San Luis Obispo for NASA Dryden Flight Research Center. The...

Briefs: Physical Sciences
Monolithic Electrostatic Sector for Miniature Mass Spectrometers

An improved miniature electrostatic sector has been designed for a miniature double-focusing mass spectrometer (see figure). Miniature mass spectrometers are essential components of...

Briefs: Physical Sciences
Oscillating-Flow Heat-Transfer and Pressure-Drop Test Rig

The figure illustrates an apparatus for measuring heat-transfer and pressure-drop characteristics of porous plug specimens in oscillating flows. The apparatus is built around an...

Briefs: Physical Sciences
Adjacent-Pair Imaging Shearography Using Bacteriorhodopsin

In a developmental technique of real-time adjacent-pair imaging shearography, a thin film of bacteriorhodopsin is used to record shearograms in argon-laser light for immediate readout in...

Briefs: Physical Sciences
Black-Body Evaporator Unit for a Point-Focus Solar Collector

The figure illustrates a solar thermal energy system for boiling water or another liquid. The system can be used for a variety of purposes that can include drying aqueous hazardous...

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