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The 2013 Moore tornado was a large and extremely violent EF5 tornado that ravaged Moore, Oklahoma, and adjacent areas on the afternoon of May 20, 2013, with peak winds estimated at 210 miles per hour (340 km/h), killing 24 people (plus two indirect fatalities) [2] and injuring 212 others. [3]
Continuous-wave radar (CW radar) is a type of radar system where a known stable frequency continuous wave radio energy is transmitted and then received from any reflecting objects. [1] Individual objects can be detected using the Doppler effect , which causes the received signal to have a different frequency from the transmitted signal ...
Pulse-repetition frequency (PRF) is the number of times a pulsed activity occurs every second. This is similar to cycle per second used to describe other types of waveforms. PRF is inversely proportional to time period which is the property of a pulsed wave. PRF is usually associated with pulse spacing, which is the distance that the pulse ...
Synthetic-aperture radar ( SAR) is a form of radar that is used to create two-dimensional images or three-dimensional reconstructions of objects, such as landscapes. [ 1] SAR uses the motion of the radar antenna over a target region to provide finer spatial resolution than conventional stationary beam-scanning radars.
Responsibility for the timing of the second bombing was delegated to Tibbets. Scheduled for 11 August, the raid was moved earlier by two days to avoid a five-day period of bad weather forecast to begin on 10 August. [189] Three bomb pre-assemblies had been transported to Tinian, labeled F-31, F-32, and F-33 on their exteriors.
The Doppler effect (also Doppler shift) is the change in the frequency of a wave in relation to an observer who is moving relative to the source of the wave. [ 1][ 2][ 3] The Doppler effect is named after the physicist Christian Doppler, who described the phenomenon in 1842. A common example of Doppler shift is the change of pitch heard when a ...
Used car prices fell 2.3% over the prior month in July and 10.9% from the prior year, data from the BLS revealed on Wednesday. New car prices fell 0.2% in July and 1.4% from the prior year ...
In August 2021, a contract was signed with Saab to modernize the Gripen fleet of the Hungarian Air Force. The radar will be upgraded to PS-05/Mk4 and the software will be upgraded to MS 20 Block 2 level. New weapons would be added to the arsenal of the Hungarian Gripens. [211] The IRIS-T missiles have been ordered in December 2021. [212]