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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".
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]
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 higher energy (shortest wavelength) ranges of UV (called "vacuum UV") are absorbed by nitrogen and, at longer wavelengths, by simple diatomic oxygen in the air. Most of the UV in the mid-range of energy is blocked by the ozone layer, which absorbs strongly in the important 200–315 nm range, the lower energy part of which is too long for ...
At these high frequencies, the short wavelengths give the radiation a very directional quality, similar to visible light. Many molecules possess rotational and vibrational states excited by very specific wavelengths in this band, thus the atmospheric gases such as oxygen, water vapor, carbon dioxide and nitrogen can absorb, and be excited causing variable beam attenuation effects dependent on ...
The IRAM 30m telescope is a radio telescope, located in the Sierra Nevada Mountain Range, Spain.It is operated by the Institute for Radio Astronomy in the Millimetre Range (IRAM) for observing astronomical objects in the millimetre range of the electromagnetic spectrum.
The return-path wavelength standard is expected to be 1610 nm, but early deployments have used 1590 nm. Using 1590/1610 nm for the return path allows the fiber infrastructure to support both RFoG and a standards-based PON simultaneously, operating with 1490 nm downstream and 1310 nm return-path wavelengths.
In 1978, on Lamb's 65th birthday, Freeman Dyson addressed him as follows: "Those years, when the Lamb shift was the central theme of physics, were golden years for all the physicists of my generation. You were the first to see that this tiny shift, so elusive and hard to measure, would clarify our thinking about particles and fields."
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