waves are all around us, and the frequency and period of a wave are two of the most important characteristics you can use to describe them.
Long waves can penetrate easily into ocean facing ports or even be amplified if the wave frequency is close to one of the natural frequencies of the harbor. Moreover, the moored ship can have its natural frequency close a natural frequency of the basin, so that large ship motions can occur...
A. B. C. D.查看答案更多“短周期自然频率主要取决于以下哪个参数? The short period natural frequency mainly depends on which of the following para…”相关的问题 第1题 商品消费周期的长短,除了取决于其本身使用的自然寿命外,还受什么因素的影响( ) A.自然磨损 B.使用方式 C.精神磨损 D.消费方式 点...
Pulse trains with periods of the order of a minute occur in the natural VLF signals emitted in the exosphere. Composed of otherwise ordinary VLF emissions, the long-period pulses always rise in frequency. At magnetically conjugate points the long-period pulse signals are received simultaneously. ...
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Mantle cell lymphoma: natural history defined in a serially biopsied population over a 20-year period. Mantle cell lymphoma: natural history defined in a serially biopsied population over a 20-year period. Annals of Oncology . 1995; 6 (3):249–256... AJ Norton,J Matthews,V Pappa,... -...
Phases between u, at one flowmeter and between u, u at different distances offshore have also been found from cross spectra and confirm that the peaks are due to edge waves. It is suggested that each of these low-frequency peaks corresponds to a progressive edge wave mode at the cutoff ...
The origin of the Chicxulub impactor, which is attributed as the cause of the K/T mass extinction event, is an unsolved puzzle. The background impact rates of main-belt asteroids and long-period comets have been previously dismissed as being too low to e
We studied responses of cellular rhythm and light-induced movement to periodic irradiation in a unicellular amoeboid organism, the Physarum plasmodium. The intrinsic frequency of the contraction rhythm, which is based on biochemical oscillations, became synchronized with the frequency of periodic irradiation...
Physical inactivity was suggested to be one of the most important risk factors for stroke mortality. Therefore, this study aimed to assess long-term trends in stroke mortality attributable to low physical activity (LPA) in China and Japan during the period 1990–2016. Mortality data were obtained...