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Joint Distribution of Wave Periods and rate of change of Wave Surface Elevation

China Ocean Engineering 1999年第2期14卷 225-229页

作者： Shi, HD Sun, F Ocean Univ Qingdao Dept Civil Engn Qingdao 266003 Peoples R China

The rate of change of wave surface elevation is of much importance in ocean engineering, especially for the determination of the limitation of wave breaking. This paper gives a kind of joint distribution of wave periods and the rate of change of wave surface elevation by means of calculation of the two-order to four-order moment of the frequency spectrum based on the linear wave theory. For the first time, the distribution density function of wave periods determined by peaks is provided, and the conclusion is drawn that the rate of change of wave surface elevation obeys the Rayleigh distribution.

关键词： rate of change wave surface elevation joint distribution wave period

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Doppler Effect: A Look from Biology Aging

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Advances in Aging Research 2024年第4期13卷 75-84页

作者： Jorge Barragán Sebastián Sánchez Department of Histology Universidad del Gran Rosario Rosario Argentina

The Doppler effect can be defined as the frequency shift suffered by a wave phenomenon, when there is a difference in relative speed between the waves generated and their source. We know that it occurs in the case of mechanical and electromagnetic waves. We propose to generalize the Doppler effect to the case of frequency changes of certain oscillatory variables in biology before and after puberty, starting from the basis that a metabolically accelerated system is equivalent to a mechanically accelerated system. We then established the following objectives: To verify if there is an average difference in heart and respiratory rates, before and after puberty. To verify the association of these frequency differences with the metabolic activity estimated as basal metabolic rate or BMR. We studied heart and respiratory rate data from healthy people of both sexes, verifying the frequency distribution before and after puberty. We also study the relationship of the frequency distribution with the evolution of the basal metabolic rate throughout life. Analysis of the results shows that the highest heart and respiratory rates occur before puberty, while the lowest rates occur after puberty. A high correlation of the evolution of the variables studied with the evolution of the metabolic acceleration of the system throughout life is also evident. Taking into account that a mechanically accelerated system is equivalent to a metabolically accelerated system, we can conclude that the frequency distribution found is the expression of a generalization of the Doppler effect in the case of biological physical systems.

关键词： Oscillatory Variables Metabolic Acceleration Mechanical Acceleration Equivalence Principle Non-Inertial System rate of change

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变化姿态角下的相位变化率无源定位方法研究(英文)

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Chinese Journal of Aeronautics 2002年第3期15卷 166-170页

作者：单月晖安玮孙仲康皇甫堪 Department 4 National University of Defense Technology Changsha 410073 China

Technology of passive location has broad prospects in applications. In this paper, the method using the phase rate of change for the single observer passive location is introduced based on existing methods. One can obtain the direction of the target with phase information of two orthogonal interferometers on the observer and the radial distance with the corresponding phase rate of change. Then the target can be located with high speed and precision. A locating approach is given when the flying posture of t...

关键词： phase rate of change single observer passive location variant posture direction radial distance MGEKF

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