Contaminant transport in underground system usually occurs in varied flow fields and in anisotropic and heterogenous media. Because the applicability of analytical solutions is extremely limited for such conditions, and the distribution and transport of pollutants in groundwater are controlled by physics and chemistry and biology courses, which include advection, mechanical disperse, molecule s...

Traffic–related pollutant has been recognized as an air pollution hot spot due to its large emission rate and great health impacts for the exposed population. In the present investigation, a computational fluid dynamics technique is used to evaluate the effect of traffic pollutions on indoor air quality of a naturally ventilated building. The transport of street-level nonreactive pollutants emi...

The paper presents some preliminary results from numerical simulations of meteorological processes and air pollutant transport based on field measurements perfomed during winter 2006 at three target areas along the Adige Valley (Northern Italy) within the project ALPNAP, funded by the European Regional Development Fund under the initiative Interreg III B "Alpine Space"(cf. de Franceschi and Zar...

Concerns over agriculturally generated atmospheric pollutants necessitate consideration of emission reduction strategies in livestock facility management. Although the association between odors and elevated ammonia (NH3) and dust concentrations remains uncertain with conflicting studies, steps taken to reduce one pollutant may effectively reduce the others as well. Various remedial activities e...

The estimation of the extent of a polluted zone after an accidental spill occurred in road transport is essential to assess the risk of water resources contamination and to design remediation plans. This paper presents a metamodel based on artificial neural networks (ANN) for estimating the depth of the contaminated zone and the volume of pollutant infiltration in the soil in a twolayer soil (a...

Substantial anthropogenic emissions from China have resulted in serious air pollution, and this has generated considerable academic and public concern. The physical transport of air pollutants in the atmosphere has been extensively investigated; however, understanding the mechanisms how the pollutant was transferred through economic and trade activities remains a challenge. For the first time, ...

In the context of stormwater quality modelling, an in-depth understanding of underlying physical processes and the availability of reliable and accurate mathematical equations, which can replicate pollutant processes are essential. Stormwater pollutants undergo three primary processes, namely, build-up, wash-off and transport, before accumulating into receiving waters. These processes are expre...

We study the theory of optimal control of systems of distributed parameters and apply to problems of ambient pollution. The model consists of a partial differential equation of parabolic type that models the transport of a pollutant in an incompressible viscous fluid, with boundary conditions and initial value; that is, in our model we consider the velocity that the pollutant propagates in the ...

The intention of this article is to compare the containment performance of a Type II microbiological safety cabinet (MSC) confronted with the simultaneous generation of a saline nanoparticle aerosol and a tracer gas (SF(6)). The back dissemination coefficient, defined as the ratio of the pollutant concentration measured outside the enclosure to the pollutant flow rate emitted inside the enclosu...

Brownian diffusion is a keystone concept in a large variety of domains, from physics, chemistry to biology. Diffusive transport controls situations as diverse as reaction-diffusion processes in biology and chemistry, Brownian ratchet processes, dispersion in microfluidic devices or even double-diffusive instability and salt-fingering phenomena in the context of ocean mixing. Although these exam...