Results 311 to 320 of about 1,229,463 (349)

Short-term power fluctuations of large wind power plants

2002 ASME Wind Energy Symposium, 2002
To evaluate short-term wind power fluctuations and their impact on electric power systems, the National Renewable Energy Laboratory, in cooperation with Enron Wind, has started a project to record output power from several large commercial wind power plants at the 1-Hertz rate. This paper presents statistical properties of the data collected so far and
Yih-Huei Wan, Demy Bucaneg
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Modeling of Short-Term Tidal Power Fluctuations

IEEE Transactions on Sustainable Energy, 2020
This article proposes the utilization of stochastic differential equations to model short-term fluctuations of tidal currents. Two relevant environmental scenarios are considered, namely, with and without waves. As opposed to the models currently available in the literature, the proposed models are based on measurement data and are shown to capture the
Guerun Margret Jonsdottir, Federico Milano   +1 more
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Short-Period Climatic Fluctuations: Effects on Diatom Biomass

Science, 1976
An analysis of the weekly averages of diatom biomass measured near the coast of Southern California (32°50′N, 117°10′W) during the period from 1928 through 1939 indicates that three major blooms account for 85 percent of each year's diatom biomass. The average duration of a single bloom is 5.5 weeks. The diatom blooms coincide with upwelling, but their
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Short-run fluctuations in foreign exchange rates

Journal of International Economics, 1982
Abstract The paper examines the statistical properties of daily changes in foreign exchange (FX) rates for nine currencies. It finds that these changes are leptokurtotic, i.e. have long-tailed and sharp peaked histograms. The evidence suggests that this leptokurtosis does not arise from an underlying Paretian stable distribution, nor from a ...
Daniel Friedman, Stoddard Vandersteel
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Short-range, high-frequency acoustic propagation fluctuations

The Journal of the Acoustical Society of America, 1982
A series of one-way high frequency acoustic propagation experiments were conducted off southern California in an area east of San Clemente Island. Source and receiver were located at depths of 137 and 107 m, respectively, below the diurnal thermocline. The source frequency was 30 kHz; the pulse duration was 0.5 ms and the pulse repetition rate was 0.5 ...
Robert J. Vent, G. Thomas Kaye
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Short period fluctuations of the equatorial electrojet

Nature, 1976
THE signal strength and Doppler frequency spectra of v.h.f. backscatter radar echoes from the equatorial electrojet are being recorded at Thumba near Trivandrum (dip ∼ 1 °S). The v.h.f. radar operates on 54.95 MHz, with identical arrays of Yagi antennae for transmission and reception; the beam axis is orientated either vertically or obliquely at 30° to
C. A. REDDY, C. V. DEVASIA
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A Nonlinear Dynamic Model of Short Run Fluctuations

The Review of Economic Studies, 1981
Most recent attempts to model the "business cycle" (see the work of Lucas (1975), Sargent-Wallace (1975), Taylor (1979)) adopt a Frisch-Slutsky framework, in which the persistence of fluctuations in macroeconomic activity is explained by the persistence of random shocks impinging on an otherwise stable (and usually linear) systematic component. Work by
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Short-term ground ozone fluctuations at Poona

Pure and Applied Geophysics, 1973
Short-term fluctuations superimposed on the diurnal variations of surface ozone recorded at Poona during 1969–1970 are discussed.
C. R. Sreedharan, V. S. Tiwari
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Short-wavelength density fluctuations in liquid metals

Journal of Physics C: Solid State Physics, 1979
Using the static structure factor S(q) and the fourth moment of the dynamical structure factor S(q omega ), the author investigates under what conditions a classical liquid can support short-wavelength density waves. It is concluded that particularly the alkali metals lithium and potassium, like rubidium, should show sharp resonance in S(q omega ) for ...
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Short‐time magnetic fluctuations of local character

Terrestrial Magnetism and Atmospheric Electricity, 1937
The comparison of the short‐time fluctuations of the Earth's vertical magnetic intensity afforded by data taken during the daylight hours by the exploration troops of the Gulf Research and Development Company indicates that at points separated by 800 miles, 58 per cent of the fluctuations are of local origin.
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