100,875 research outputs found
Analytical smoothing effect of solution for the boussinesq equations
In this paper, we study the analytical smoothing effect of Cauchy problem for
the incompressible Boussinesq equations. Precisely, we use the Fourier method
to prove that the Sobolev H 1-solution to the incompressible Boussinesq
equations in periodic domain is analytic for any positive time. So the
incompressible Boussinesq equation admet exactly same smoothing effect
properties of incompressible Navier-Stokes equations
Tunnel switch diode based on AlSb/GaSb heterojunctions
We report on tunnel switch diodes based on AlSb barriers and GaSb pân junctions grown by molecular beam epitaxy. These were the devices with thyristor like switching in the GaSb/AlSb system. The characteristic "S" shaped currentâvoltage curve was found to occur for structures with AlSb barriers less than 300 Ă
thick. The switching voltage and current density exhibited less sensitivity to barrier and epilayer thickness than was predicted by the punch-through model. The results were correlated with drift diffusion simulations which have been modified to account for the presence of a tunneling contact
Longitudinal evidence for a midlife nadir in human well-being : results from four data sets
There is a large amount of cross-sectional evidence for a midlife low in the life cycle of human happiness and well-being (a âU shapeâ). Yet no genuinely longitudinal inquiry has uncovered evidence for a U-shaped pattern. Thus some researchers believe the U is a statistical artefact. We re-examine this fundamental cross-disciplinary question. We suggest a new test. Drawing on four data sets, and only within-person changes in well-being, we
document powerful support for a U-shape in unadjusted longitudinal data without the need for regression equations. The paperâs methodological contribution is to exploit the first-derivative properties of a well-being equation
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