943 resultados para Voltage ripple


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Issued also as thesis (M.S.) University of Illinois.

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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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"Project no. 8173, Task no. 817305."

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"Sponsored by the Air Force Flight Dynamics Laboratory ... under Contract AF 33(615)-1835."

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Mode of access: Internet.

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Includes bibliographical references (p. 49).

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Mode of access: Internet.

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Includes bibliographical references (p. 61).

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"April 1975."

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Mode of access: Internet.

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Glass Slide #11

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Motivated by applications to quantum computer architectures we study the change in the exchange interaction between neighbouring phosphorus donor electrons in silicon due to the application of voltage biases to surface control electrodes. These voltage biases create electro-static fields within the crystal substrate, perturbing the states of the donor electrons and thus altering the strength of the exchange interaction between them. We find that control gates of this kind can be used to either enhance or reduce the strength of the interaction, by an amount that depends both on the magnitude and orientation of the donor separation.