57 research outputs found
Nonlinear wave interaction in coastal and open seas -- deterministic and stochastic theory
We review the theory of wave interaction in finite and infinite depth. Both of these strands of water-wave research begin with the deterministic governing equations for water waves, from which simplified equations can be derived to model situations of interest, such as the mild slope and modified mild slope equations, the Zakharov equation, or the nonlinear Schr\"odinger equation. These deterministic equations yield accompanying stochastic equations for averaged quantities of the sea-state, like the spectrum or bispectrum. We discuss several of these in depth, touching on recent results about the stability of open ocean spectra to inhomogeneous disturbances, as well as new stochastic equations for the nearshore
Simulating multiple quantum well solar cells
The quantum well solar cell (QWSC) has been proposed as a route to higher
efficiency than that attainable by homojunction devices. Previous studies have
established that carriers escape the quantum wells with high efficiency in
forward bias and contribute to the photocurrent. Progress in resolving the
efficiency limits of these cells has been dogged by the lack of a theoretical
model reproducing both the enhanced carrier gen- eration and enhanced
recombination due to the quantum wells. Here we present a model which
calculates the incremental generation and recombination due to the QWs and is
verified by modelling the experimental light and dark current-voltage
characteristics of a range of III-V quantum well structures. We find that
predicted dark currents are significantly greater than experiment if we use
lifetimes derived from homostructure devices. Successful simulation of light
and dark currents can be obtained only by introducing a parameter which
represents a reduction in the quasi-Fermi level separation.Comment: Preprint submitted to the 28th IEEE Photovoltaic Specialists
Conference, Anchorage, Alaska, USA, Sept. 2000, pp. 1304-130
Efeitos de um programa de treinamento neuromuscular sobre o consumo máximo de oxigênio e salto vertical em atletas iniciantes de voleibol
The long string at the stretched horizon and the entropy of large non-extremal black holes
Analytical and numerical modelling of thermoviscous shocks in their interactions in nonlinear fluids including dissipation.
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