963 resultados para Wavelength division multiplexing
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Strategic Plan for the Iowa Division of Vocational Rehabilitation Services
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Agency Strategic Performance Report
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Annual Report, Agency Performance Plan
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Agency Performance Plan, Department of Commerce - Credit Union Division
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Shoreline undulations extending into the bathymetric contours with a length scale larger than that of the rhythmic surf zone bars are referred to as shoreline sand waves. Many observed undulations along sandy coasts display a wavelength in the order 1-7 km. Several models that are based on the hypothesis that sand waves emerge from a morphodynamic instability in case of very oblique wave incidence predict this range of wavelengths. Here we investigate the physical reasons for the wavelength selection and the main parametric trends of the wavelength in case of sand waves arising from such instability. It is shown that the existence of a minimum wavelength depends on an interplay between three factors affecting littoral drift: (A) the angle of wave fronts relative to local shoreline, which tends to cause maximum transport at the downdrift flank of the sand wave, (B) the refractive energy spreading which tends to cause maximum transport at the updrift flank and (C) wave focusing (de-focusing) by the capes (bays), which tends to cause maximum transport at the crest or slightly downdrift of it. Processes A and C cause decay of the sand waves while process B causes their growth. For low incidence angles, B is very weak so that a rectilinear shoreline is stable. For large angles and long sand waves, B is dominant and causes the growth of sand waves. For large angles and short sand waves C is dominant and the sand waves decay. Thus, wavelength selection depends on process C, which essentially depends on shoreline curvature. The growth rate of very long sand waves is weak because the alongshore gradients in sediment transport decrease with the wavelength. This is why there is an optimum or dominant wavelength. It is found that sand wave wavelength scales with λ0/β where λ0 is the water wave wavelength in deep water and β is the mean bed slope from shore to the wave base.
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Three year program reports
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The Iowa Arts Council is excited to accomplish goals on behalf of Iowa while helping support the strategic direction of the Department of Cultural Affairs. With an eye to the future, the Iowa Arts Council remains committed to honoring its 45-year legacy while staying true to its mission of enriching the quality of life in Iowa through support of the arts.
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Frequently asked questions and answers regarding the Division of Labor Contractor Registration Law in Iowa.
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Iowa Alcoholic Beverages Division, 71st Annual Report, July 2004 - June 2005
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Iowa Alcoholic Beverages Division, 71st Annual Report, July 2004 - June 2005
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Iowa Alcoholic Beverages Division, 71st Annual Report
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Iowa Alcoholic Beverages Division Annual Report
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Iowa Alcoholic Beverages Division Annual Report
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Iowa Alcoholic Beverages Division Annual Report
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Iowa Alcoholic Beverages Division Annual Report
