In this study, the long-term tailing derived from the storage process of contaminants in low-permeability zones is investigated. The release from these areas in the groundwater can be considered a long-term source that often undermines remediation efforts. An Image Analysis technique is used to analyze the process and evaluate the concentrations of a tracer at different points of the test secti...

Implicit variant WENO schemes with anti-diffusive flux for compressible flow computations are presented. These variant WENO schemes include the antis for the preconditioned compressible Euler/Navier-Stokes equations are also considered. The numerical flux of the variant WENO scdiffusive flux corrections, the mapped WENO scheme, and modified smoothness indicator. Implicit WENO schemeheme is cons...

A direct signature of electron transport at the metallic surface of a topological insulator is the Aharonov-Bohm oscillation observed in a recent study of Bi2Se3 nanowires [Peng, Nature Mater. 9, 225 (2010)] where conductance was found to oscillate as a function of magnetic flux ϕ through the wire, with a period of one flux quantum ϕ0=h/e and maximum conductance at zero flux. This seemingly agr...

[1] We show that the flux of mass crossing in one direction (the ‘‘gross’’ flux) through any specified surface S that divides anadvective-diffusive flow in a closed domain is infinite. That is, the flux, F (t), through S of the fluid mass that spent at least time t on one side of S diverges like t 1/2 as t ! 0, in the continuum limit. The gross flux is completely dominated by fluid elements res...

Below the sill depth (at about 2400m) of the Alpha-Mendeleyev ridge complex, the waters of the Canada Basin (CB) of the Arctic Ocean are isolated, with a C isolation age of about 500 yr. The potential temperature y decreases with depth to a minimum ymE 0:524 C near 2400m, increases with depth through an approximately 300m thick transition layer to yhE 0.514 C, and then remains uniform from abou...

Recent observations have detected trace amounts of CH(4) heterogeneously distributed in the martian atmosphere, which indicated a subsurface CH(4) flux of ~2 x 10(5) to 2 x 10(9) cm(2) s(1). Four different origins for this CH(4) were considered: (1) volcanogenic; (2) sublimation of hydrate- rich ice; (3) diffusive transport through hydrate-saturated cryosphere; and (4) microbial CH(4) generatio...

We propose a theoretical prototype of a micro-scale turbine externally driven by diffusive heat flux without the need for macroscopic particle flux, which is in sharp contrast to conventional turbines. The prototypes are described analytically and validated by computer simulations. Our results indicate that a micro-scale turbine composed of anisotropic blades can rotate unidirectionally in an e...

The influence of sediment oxygen heterogeneity, due to bioturbation, on diffusive oxygen flux was investigated. Laboratory experiments were carried out with 3 macrobenthic species presenting different bioturbation behaviour patterns: the polychaetes Nereis diversicolor and Nereis virens, both constructing ventilated galleries in the sediment column, and the gastropod Cyclope neritea, a burrowin...

A transient, vertically resolved, analytical model for the early diagenesis of silica has been developed to quantify the importance of benthic-pelagic coupling in estuarine biogeochemical silica cycling. A sensitivity analysis based on Monte-Carlo simulations is carried out to assess the intensity and timing of benthic diffusive fluxes in response to a pelagic diatom bloom. The diffusive flux d...