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but unlike humans but upon reflection but useful innovation but usually most but very expe ive but very little time but very relaxed but waiting but was it murder but was not a welcome but watch your portio but we aint been ther but we refuse to beli but we speak the wisd but what i...
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electromagnetic wave n. A wave of electromagnetic energy that is radiated by an accelerating or oscillating electric charge and propagates through a vacuum or a material medium as a periodic disturbance of the electromagnetic field at a frequency within the electromagnetic spectrum. ...
Huygens' Principle (1678) implies that every point on a wave front serves as a source of secondary wavelets, and the new wave front is the tangential surface to all the secondary wavelets. But two problems arise: portions of wavelets that exist outside o
In regions of the band structure with nearly quadratic dispersion relationε(n,k) ∝ k2, in the present case near the bottom of CB1, the final group velocity depends linearly on the applied vector potential for all occupiedk. This corresponds to a Bloch wavepacket that is non-dispersive...
Once the existence of this wave-length had been discovered, it was not long before its use as the uniquely recognizable broadcasting frequency for interstellar communication was suggested. Without something of this kind, searching for intelligences on other planets would be like trying to meet a fri...
原文:As a shipbuilder, Cockerell was trying to find a solution to the problem of the wave resistance which wastes a good deal ofa surface ship's power and limits its speed. 作为一个船舶技师,科克雷尔在寻找解决波浪阻力的方法,因为波浪阻力浪费掉了船在水面行驶的大量动力,从而限制了船的速度。
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(upon choice of the objective) to further determine the parameter, e.g.,βas in Eq. (4). Although there is no general theoretically guaranteed optimal choice, several common methods can be utilized, e.g., cross-validation techniques that had been well-developed in the literature of ...