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In acoustic emission testing, the challenge is to recognize the multiple Lamb wave components in the received waveform and to interpret them in terms of source motion. This contrasts with the situation in ultrasonic testing, where the first challenge is to generate a single, well-controlled Lamb wave mode at a single frequency.
Due to their higher speed, the P and S waves generated by an earthquake arrive before the surface waves. However, the particle motion of surface waves is larger than that of body waves, so the surface waves tend to cause more damage. In the case of Rayleigh waves, the motion is of a rolling nature, similar to an ocean surface wave. The ...
A cold wave (known in some regions as a cold snap, cold spell or Arctic Snap) is a weather phenomenon that is distinguished by a cooling of the air. Specifically, as used by the U.S. National Weather Service , a cold wave is a rapid fall in temperature within a 24-hour period requiring substantially increased protection to agriculture, industry ...
While a weather pattern with a strong cyclone and strong high-pressure system was the overall cause, the NWS forecaster's best assessment of what caused the big wave was a complicated story of ...
Severe weather is any dangerous meteorological phenomenon with the potential to cause damage, serious social disruption, or loss of human life. [ 1 ] [ 2 ] [ 3 ] These vary depending on the latitude , altitude , topography , and atmospheric conditions.
Weather-related fatalities in the United States may be caused by extreme temperatures, such as abnormal heat or cold, flooding, lightning, tornado, hurricane, wind, rip currents, and others. The National Weather Service compiles statistics on weather-related fatalities and publishes reports every year. [ 2 ]
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Studies have been performed on the use of shortwave radiation for cancer therapy and promoting wound healing, with some success. However, at a sufficiently high energy level, shortwave energy can be harmful to human health, potentially causing damage to biological tissues, for example by overheating or inducing electrical currents. [28]