13 Result(s)

Article

Evaluation of VOC fluxes at the soil-air interface using different flux chambers and a quasi-analytical approach

Dense nonaqueous-phase liquids (DNAPLs) spilled on the soil migrate vertically depending upon gravity and capillary forces through the unsaturated zone of the porous aquifer, forming a vapour plume. These vola...

Solenn Cotel, Gerhard Schäfer, Sylvie Traverse… in Water, Air, & Soil Pollution (2015)

Article

Highly gravity-driven flow of a NAPL in water-saturated porous media using the discontinuous Galerkin finite-element method with a generalised Godunov scheme

In this paper, we develop an implementation of gravity effects within a Global Pressure formulation in a numerical scheme based on the implicit pressure explicit saturation (IMPES) approach. We use the Discont...

Lauriane Schneider, Raphaël di Chiara Roupert, Gerhard Schäfer… in Computational Geosciences (2015)

Article

S. Kopeikin, M. Efroimsky and G. Kaplan: Relativistic celestial mechanics of the solar system

Gerhard Schäfer in General Relativity and Gravitation (2013)

Article

Prediction of Vertical DNAPL Vapour Fluxes in Soils Using Quasi-Analytical Approaches: Bias Related to Density-Driven and Pressure-Gradient-Induced Advection

This study focuses on a detailed analysis of the errors introduced by two quasi-analytical approaches based on either Fick’s first law or a combination of Fick’s and Darcy’s laws to evaluate the vapour flux of...

Salsabil Marzougui, Gerhard Schäfer, Lotfi Dridi in Water, Air, & Soil Pollution (2012)

Article

Gravitomagnetism in Physics and Astrophysics

Based on general relativity, the article reviews gravitomagnetism in physics and astrophysics. Emphasis is put on observational effects. Accelerated reference frames in flat spacetime are discussed to illumina...

Gerhard Schäfer in Space Science Reviews (2009)

Article

A canonical dynamics view of the Newtonian limit of general relativity

The Newtonian limit of general relativity was Jürgen Ehlers favourite model for limit relations between theories of physics. In this contribution, for the case of isolated systems, the Newtonian limit of gener...

Gerhard Schäfer in General Relativity and Gravitation (2009)

Article

Large Scale Experiment on Transport of Trichloroethylene in a Controlled Aquifer

Pollution by dense non-aqueous phase liquids (DNAPLs) represents a major threat to groundwater resources. In a real case of site contamination, the efficiency of remediation techniques is often limited by a la...

Salah Jellali, Paul Muntzer, Olivier Razakarisoa… in Transport in Porous Media (2001)

Article

Surfactant Enhanced In Situ Remediation of LNAPL Contaminated Aquifers: Large Scale Studies on a Controlled Experimental Site

A central problem in a real case remediation of an oil contaminated site is the knowledge of the volume and the extent of the pollution. As the estimation of the mass balance, usually based on some point measu...

Mehdi bettahar, Jean Ducreux, Gerhard Schäfer… in Transport in Porous Media (1999)

Article

BOOK REVIEW: Proceedings of the 14th International Conference on General Relativity and Gravitation, edited by M. Francaviglia, G. Longhi, L. Lusanna, and E. Sorace

Gerhard Schäfer in General Relativity and Gravitation (1998)

Article

The ADM Hamiltonian at the postlinear approximation

The ADM Hamiltonian for a many-particle system is calculated up to the postlinear approximation, i.e., to the approximation that both the equations of motion for the particles and the equations of motion for t...

Gerhard Schäfer in General Relativity and Gravitation (1986)

Article

Lagrangians forn point masses at the second post-Newtonian approximation of general relativity

We study the effect of an infinitesimal coordinate transformation on the Lagrangian and on the metric functional of a system ofn point masses. We show how to compute the Lagrangians ofn point masses at the second...

Thibault Damour, Gerhard Schäfer in General Relativity and Gravitation (1985)