Influence of Imperfect Internal Waves on Long-Range Underwater Acoustic Propagation
T. A. Andreeva, W. W. Durgin, and S. E. Wojcik
This work presents a numerical analysis of the effect of random fluctuations of internal waves on the chaotic dynamics of ray trajectories in ocean acoustics. The Eikonal equation is considered in a form of the second order, nonlinear ordinary differential equation. Random phase modulations in the f ... [J. Comput. Nonlinear Dynam. 5, 014501 (2009)] published Thu Nov 12, 2009.
Tidal flow over three-dimensional topography in a stratified fluid
Benjamin King, H. P. Zhang, and Harry L. Swinney
Our laboratory experiments and numerical simulations of stratified tidal flow past model topography (a half sphere on a horizontal plane) reveal several three-dimensional flow features, including an unexpected flow perpendicular to the forcing plane (the vertical plane through the center of the sphe ... [Phys. Fluids 21, 116601 (2009)] published Mon Nov 9, 2009.
Other climate-change inputs
Brian A. Tinsley
Abstract not available. [Phys. Today 62, 12 (2009)] published Mon Nov 2, 2009.
On fully nonlinear, vertically trapped wave packets in a stratified fluid on the f-plane
M. Stastna, F. J. Poulin, K. L. Rowe, and C. Subich
The ubiquity of solitary and solitarylike internal waves in the coastal ocean has been recognized for some time. Recent theoretical studies of a strongly nonlinear, weakly nonhydrostatic set of layer-averaged model equations have predicted that rotation, for example, on the f-plane, can lead to the ... [Phys. Fluids 21, 106604 (2009)] published Thu Oct 29, 2009.
Fixed points, stable manifolds, weather regimes, and their predictability
Bruno Deremble, Fabio D'Andrea, and Michael Ghil
In a simple, one-layer atmospheric model, we study the links between low-frequency variability and the model's fixed points in phase space. The model dynamics is characterized by the coexistence of multiple weather regimes. To investigate the transitions from one regime to another, we focus on the i ... [Chaos 19, 043109 (2009)] published Tue Oct 27, 2009.
Surface nuclear magnetic resonanceA unique tool for hydrogeophysics
Ugur Yaramanci and Mike Muller-Petke
Surface nuclear magnetic resonance (surface NMR) is the only geophysical exploration method that nondestructively provides direct information on subsurface aquifer properties (i.e., geometry, water content, hydraulic conductivity, and, partially, resistivity). The method combines the information acc ... [The Leading Edge 28, 1240 (2009)] published Tue Oct 13, 2009.
Identifying dispersive GPR signals and inverting for surface wave-guide properties
Jan van der Kruk, H. Vereecken, and Robert W. Jacob
The vadose zone is a dynamic environment in which water is retained or transferred into the saturated zone or atmosphere. Knowledge of water content in the near-surface soil layers is important for improving our understanding of groundwater recharge, evaporation, and uptake by crops or natural veget ... [The Leading Edge 28, 1234 (2009)] published Tue Oct 13, 2009.
An introduction to this special section: Hydrogeophysics
Rick Miller
Water is obviously essential for human survival. Energy, in one form or another, is critical to all life and necessary to the current and future world economy. There are renewable and nonrenewable forms of both water and energy. Energy is or has been the focus of much debate, research, exploration, ... [The Leading Edge 28, 1210 (2009)] published Tue Oct 13, 2009.
Photodynamic Treatment versus Antibiotic Treatment on Helicobacter pylori Using RAPD-PCR
M. H. El-Batanouny, R. M. Amin, M. K. Ibrahium, S. El Gohary, M. I. Naga et al.
Helicobacter pylori is one of the most common causes of chronic bacterial infections in humans and is important in the pathogenesis of gastrointestinal disease, such as duodenal ulcer, gastric ulcer, Gastric adenocarcinoma, and lymphoma. Gastric adenocarcinoma remains one of the leading causes of ca ... [AIP Conf. Proc. 1172, 106 (2009)] published Thu Oct 8, 2009.
Nonlinear Crest, Trough, and Wave Height Distributions in Sea States With Double-Peaked Spectra
Felice Arena and C. Guedes Soares
The peak to trough distributions of nonlinear high sea waves in bimodal sea states in deep water are investigated. The statistical distribution of wave height is first analyzed by considering the Boccotti's expression, where the parameters of the distribution are calculated for some bimodal spectra ... [J. Offshore Mech. Arct. Eng. 131, 041105 (2009)] published Wed Sep 30, 2009.
Wave energy converter with enhanced amplitude response at frequencies coinciding with Swedish west coast sea states by use of a supplementary submerged body
J. Engstrom, M. Eriksson, J. Isberg, and M. Leijon
The full-scale direct-driven wave energy converter developed at Uppsala University has been in offshore operation at the Swedish west coast since 2006. Earlier simulations have now been validated by full-scale experiment with good agreement. Based on that, a theoretical model for a passive system ha ... [J. Appl. Phys. 106, 064512 (2009)] published Mon Sep 28, 2009.
Multi-scale Phenomena In the World of Ants
Walter R. Tschinkel
Abstract not available. [AIP Conf. Proc. 1167, 87 (2009)] published Wed Sep 23, 2009.
From Individual to Collective Behavior of Unicellular Organisms: Recent Results and Open Problems
Chuan Xue, Hans G. Othmer, and Radek Erban
The collective movements of unicellular organisms such as bacteria or amoeboid (crawling) cells are often modeled by partial differential equations (PDEs) that describe the time evolution of cell density. In particular, chemotaxis equations have been used to model the movement towards various kinds ... [AIP Conf. Proc. 1167, 3 (2009)] published Wed Sep 23, 2009.
Multiscale Simulation in the Earth Simulator and Its Impacts
Keiko Takahashi, Ryo Onishi, Takeshi Sugimura, and Yuya Baba
Multi-Scale Simulator for the Geoenvironment (MSSG), which is a coupled non-hydrostatic atmosphere-ocean-land model, has been developed in the Earth simulator Center. Out line of MSSG is introduced and characteristics are presented. Computational performance analysis has been performed on the Earth ... [AIP Conf. Proc. 1167, 26 (2009)] published Wed Sep 23, 2009.
Triple Cascade Behavior in Quasigeostrophic and Drift Turbulence and Generation of Zonal Jets
Sergey Nazarenko and Brenda Quinn
We study quasigeostrophic (QG) and plasma drift turbulence within the Charney-Hasegawa-Mima (CHM) model. We focus on the zonostrophy, an extra invariant in the CHM model, and on its role in the formation of zonal jets. We use a generalized Fjortoft argument for the energy, enstrophy, and zonostrophy ... [Phys. Rev. Lett. 103, 118501 (2009)] published Fri Sep 11, 2009.
Contribution of water droplets to charge release by laser filaments in air
Stefano Henin, Yannick Petit, Denis Kiselev, Jerome Kasparian, and Jean-Pierre Wolf
We measured the electric charge release from single water microdroplets illuminated by ultrashort laser filaments in air. This charge is up to 600 times larger than from a comparable filament volume in air. In contrast, for atmospheric droplet concentrations and sizes, the volume-averaged overall dr ... [Appl. Phys. Lett. 95, 091107 (2009)] published Fri Sep 4, 2009.
Satellite altimetry quantifies the alarming thinning of Arctic sea ice
Mark Wilson
The Arctic Ocean's floating sea-ice cover waxes and wanes with the seasons. The icecap grows in the fall when the hours of sunlight shorten and intense cold sets in. When long summer days return, ice floes melt or are driven by wind and ocean currents into the North Atlantic Ocean. A quarter century ... [Phys. Today 62, 19 (2009)] published Tue Sep 1, 2009.
A Theoretical Study of Dielectric Properties of Carbon Soot
R. Langlet, F. Moulin, S. Picaud, M. Devel, and M. R. Vanacharla
Dielectric properties of various soot nanoparticles are simulated using an atomistic multi-step DDA-like approach. It is found that even for pure carbon particles, these properties clearly depend on the details of the atomic structure, especially in the visible domain. ... [AIP Conf. Proc. 1148, 709 (2009)] published Mon Aug 24, 2009.
An Application of the Mesh Generation and Refinement Tool to Mobile Bay, Alabama, USA
Wali Aziz, Vladimir J. Alarcon, William McAnally, James Martin, and John Cartwright
A grid generation tool, called the Mesh Generation and Refinement Tool (MGRT), has been developed using Qt4. Qt4 is a comprehensive C++ application framework which includes GUI and container class-libraries and tools for cross-platform development. MGRT is capable of using several types of algorithm ... [AIP Conf. Proc. 1148, 651 (2009)] published Mon Aug 24, 2009.
Using NEXRAD Precipitation Data for Enriching Hydrological and Hydrodynamic Models in the Northern Gulf of Mexico
Vladimir J. Alarcon, William McAnally, Louis Wasson, James Martin, and John Cartwright
Scarcity of precipitation data is common when modeling and simulating watershed hydrology. Current availability of ground-based radar stations provides estimations of precipitation in ways that were inexistent before. However, the delivering method for radar-estimated precipitation (raster layers of ... [AIP Conf. Proc. 1148, 646 (2009)] published Mon Aug 24, 2009.
A Hydrological Model of the Mobile River Watershed, Southeastern USA
Vladimir J. Alarcon, William McAnally, Jairo Diaz-Ramirez, James Martin, and John Cartwright
A hydrological model of the Mobile Bay watershed located in the northern Gulf of Mexico, (Alabama, USA) is presented. The modeling of hydrological processes is performed using the Hydrological Simulation Program Fortran (HSPF). The project region was divided into two sectors for simplifying the mode ... [AIP Conf. Proc. 1148, 641 (2009)] published Mon Aug 24, 2009.
The Greenhouse Effect Does Exist!. (arXiv:0911.3735v1 [physics.ao-ph])
ePrint arXiv http://arXiv.org/