991 resultados para Microscopie de balayage à effet tunnel (STM)


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Mode of access: Internet.

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"This work was supported in part by the Office of Naval Research under Contract No. Nonr-1834(15)"

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The development of sand ripples in an oscillatory-flow water tunnel was observed in 104 laboratory experiments approximating conditions at the seabed under steady progressive surface waves. The period, T, and amplitude, a, of the water motion were varied over wide ranges. Three quartz sands were used, with mean grain diameters, D = 0.55, 0.21, and 0.18 millimeter. In 24 experiments, with the bed initially leveled, T was reduced until ripples appeared, and their development to final equilibrium form was observed without further change in T. The remaining 80 experiments investigated the response of previously established bed forms to changes in T or a or both. The ripple length, lambda, and height, eta, were measured from photos, except when bed forms were three dimensional.

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"AEDC TDR-62-54. Program area 750A. AFSC project 4773. Contract no. AF40(600)-804."

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Caption title.

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"Task 9R99-005-04. Contract DA 44-177-TC-710."

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"The experimental study reported here has been performed under the sponsorship of the Fluid Dynamics Branch, Aeronautical Research laboratories of the U.S. Air Force Air Research and Development Command, Contract no. AF 33(616)-6025."

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"January 1969."