Potential vorticity (PV) is an important quantity in stratified flows because it conserved following the flow absence of forcing and viscous diffusive effects. However, as shown by previous work for unstratified turbulence, viscosity diffusion, when present, are not purely dissipative can create potential even none present initially. In this work, we use direct numerical simulations to investig...

The breaking of wind-generated waves plays a significant role in the exchanges of momentum, heat, water vapour, and gas between the atmosphere and the ocean. Breaking waves entrain air into the surface water forming bubbles, which manifests itself as a whitecap on the ocean surface. Whitecap measurements in the open ocean are sparse and are limited to Monahan and Muircheartaigh, (1980), the war...

We observe traveling waves emitted from Turing spots in the chlorine dioxide-iodine-malonic acid reaction. The newborn waves are continuous, but they break into segments as they propagate, and the propagation of these segments ultimately gives rise to spatiotemporal chaos. We model the wave-breaking process and the motion of the chaotic segments. We find stable segmented spirals as well. We att...

We investigate the possibility that a (light) hidden sector extra photon receives its mass via spontaneous symmetry breaking of a hidden sector Higgs boson, the so-called hidden-Higgs. The hidden-photon can mix with the ordinary photon via a gauge kinetic mixing term. The hidden-Higgs can couple to the Standard Model Higgs via a renormalizable quartic term – sometimes called the Higgs Portal. W...

In supersymmetric models, scalar top quarks, or stops, generically have parity-violating couplings to top quarks. As a result, tops produced in stop decays should be polarized. In this paper, we will argue that this effect may be observable at the LHC with realistic integrated luminosities, provided that one of the stops is copiously produced and can decay to a top and a neutralino. We define t...

A study is presented to examine the one-horizontal dimension effect of a shallow shelf obstacle on nonlinear long wave runup. Due to the large horizontal-vertical aspect ratio of this problem, it is not well suited for experimental analysis, and therefore this study is purely numerical. Simulations are performed for various incident wave conditions, obstacle height and widths, and final beach s...

WindSat, the first polarimetric microwave radiometer on orbit, and the NPOESS Conical Microwave Imager/Sounder, scheduled for launch in 2010, are both designed to retrieve the ocean surface wind vector from radiometric brightness temperatures. Available observations and models show that the wind direction signal is only 1-3 K peak-to-peak at 19 and 37 GHz, much smaller than the wind speed signa...