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At these longer wavelengths the attenuation of the wave is less so that flaws can be detected at greater distances. A major challenge and skill in the use of Lamb waves for ultrasonic testing is the generation of specific modes at specific frequencies that will propagate well and give clean return "echoes".
SEVENDIP, which stands for Search for Extraterrestrial Visible Emissions from Nearby Developed Intelligent Populations, was a project developed by the Berkeley SETI Research Center at the University of California, Berkeley that used visible wavelengths to search for extraterrestrial life's intelligent signals from outer space.
The Lunar Crater Radio Telescope (LCRT) is a proposal by the NASA Institute for Advanced Concepts to create an ultra-long-wavelength (hereby wavelengths greater than 10 m – i.e., frequencies below 30 MHz) radio telescope inside a lunar crater on the far side of the Moon. Square Kilometer Array (SKA-Phase2) Australia, South Africa 0.05–30 GHz
The longitudinal modes correspond to the wavelengths of the wave which are reinforced by constructive interference after many reflections from the cavity's reflecting surfaces. All other wavelengths are suppressed by destructive interference. A longitudinal mode pattern has its nodes located axially along the length of the cavity.
The Owens Valley Long Wavelength Array, commissioned in 2013, is a duplicate of the Long Wavelength Array in New Mexico. It consists of 288 dipole antennas spread out over a desert area equivalent to about 450 football fields. [6] The OVRO-LWA produces whole-sky radio images in the 30 to 88 megahertz band. [7]
California state officials have suspended a company’s sales of raw milk to retailers amid ongoing concerns about bird flu.. Raw milk sales by Raw Farm, located in Fresno, was blocked from ...
California Highway Patrol officers were floored by the "next level monkey business" they discovered inside a speeding Rolls-Royce Ghost in Madera County on Monday night: five cellphones, four ...
I-15 in San Bernardino County, California: 33 (population 2.19M) I-10 in Riverside County, California: 17 (population 2.47M) US-19 in Pasco County, Florida: 14 (population 609k)
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