The one component that may be hard to find is the parabolic reflector. You cannot simply use a bowl or other curved object as the precise parabolic shape ensures that sound waves are reflected ...

To me, this means a large parabolic reflector, a feed horn made of brass sheet, coat hanger wire, and at least for the initial experiments, an RTL-SDR dongle. I’ve done the calculations ...

This focussing effect is very strong with wavelengths less than the aperture of the reflector, making it particularly suitable for recording high frequency sounds such as birdsong. Schematic diagram ...

It will be readily understood that this trough with its bent ribs and flat minors forms a perfect parabolic reflector, to which a cylindrical heater, as stated, may be attached for generating ...

Home Depot has announced a new line of white LED light bulbs under its EcoSmart brand. EcoSmart Universal Select Light Bulbs ...

Researchers at Osaka Metropolitan University have developed a straightforward method for predicting the measurement precision of fringe projection photogrammetry.

Some of the reflector segments are covered to prevent powerful rays ... The solar array assembly features a 430.5-square foot parabolic dish coated with 36 plastic foil elliptic mirrors that are just ...