Results 1 to 10 of about 264,473 (74)

Subelliptic Bourgain-Brezis Estimates on Groups [PDF]

, 2008
We show that divergence free vector fields which belong to L^1 on stratified, nilpotent groups are in the dual space of functions whose sub-gradient are L^Q integrable where Q is the homogeneous dimension of the group.
Chanillo, Sagun, Van Schaftingen, Jean
core   +2 more sources

Anti-aliasing with stratified B-spline filters of arbitrary degree [PDF]

, 2006
A simple and elegant method is presented to perform anti-aliasing in raytraced images. The method uses stratified sampling to reduce the occurrence of artefacts in an image and features a B-spline filter to compute the final luminous intensity at each ...
Anderson J., Gamito M. N., Glassner A. S., Press W. H., Stark M., Yellot J. I.   +5 more
core   +1 more source

Quasi-geostrophic modes in the Earth's fluid core with an outer stably stratified layer [PDF]

, 2015
Seismic waves sensitive to the outermost part of the Earth's liquid core seem to be affected by a stably stratified layer at the core-mantle boundary.
Schaeffer, Nathanaël, Vidal, Jérémie
core   +5 more sources

Poisson structures on certain moduli spaces for bundles on a surface [PDF]

, 1994
Let $\Sigma$ be a closed surface, $G$ a compact Lie group, with Lie algebra $g$, and $\xi \colon P \to \Sigma$ a principal $G$-bundle. In earlier work we have shown that the moduli space $N(\xi)$ of central Yang- Mills connections, for appropriate ...
Huebschmann, Johannes
core   +4 more sources

Urban energy exchanges monitoring from space [PDF]

, 2018
One important challenge facing the urbanization and global environmental change community is to understand the relation between urban form, energy use and carbon emissions.
AJ Arnfield, B Crawford, B Offerle, CSB Grimmond, CSB Grimmond, CW Kent, D Founda, F Creutzig, F Lindberg, F Lindberg, F Lindberg, G Pigeon, HC Ward, J-P Gastellu-Etchegorry, JA Voogt, JA Voogt, JP Gastellu-Etchegorry, K Nishida, KC Seto, M Kanda, M Kanda, N Chrysoulakis, Q Wang, Q Weng, Q Weng, R Kormann, S Chen, S Kato, S Kato, S Kato, S Kotthaus, S Russo, SK Meyn, T Ando, T Sun, W Xu, Z Mitraka, Z Mitraka, Z Mitraka   +38 more
core   +4 more sources

Effect of exposure to natural environment on health inequalities: an observational population study [PDF]

, 2008
<b>Background:</b> Studies have shown that exposure to the natural environment, or so-called green space, has an independent effect on health and health-related behaviours.
Bibby, Brunner, Cohen, Davey-Smith, de Vries, Frank Popham, Giles-Corti, Grahn, Groenewegen, Hartig, Humpel, Jerrett, Kaczynski, Kahn, Kiecolt-Glaser, Krewski, Maas, Macintyre, Mackenbach, Mackenbach, Marmot, Marmot, Mitchell, Mitchell, Nowak, Popham, Pretty, Richard Mitchell, Roux, Saelens, Smith, Smith, Smith, Tardon, Ulrich, Ulrich, van den Berg, Warburton, Wilkinson, Wilkinson, Wilkinson, Williams, Woods, Yusuf   +43 more
core   +1 more source

The Ruijsenaars self-duality map as a mapping class symplectomorphism [PDF]

, 2011
This is a brief review of the main results of our paper arXiv:1101.1759 that contains a complete global treatment of the compactified trigonometric Ruijsenaars-Schneider system by quasi-Hamiltonian reduction. Confirming previous conjectures of Gorsky and
Feher, L., Klimcik, C.
core   +2 more sources

A subelliptic Bourgain-Brezis inequality

, 2014
We prove an approximation lemma on (stratified) homogeneous groups that allows one to approximate a function in the non-isotropic Sobolev space $\dot{NL}^{1,Q}$ by $L^{\infty}$ functions, generalizing a result of Bourgain-Brezis \cite{MR2293957}. We then
Wang, Yi, Yung, Po-Lam
core   +1 more source

First Passage Time in a Two-Layer System

, 1994
As a first step in the first passage problem for passive tracer in stratified porous media, we consider the case of a two-dimensional system consisting of two layers with different convection velocities.
F. A. L. Dullien, G. Dagan, G. Matheron, G. Zumofen, I. Webman, J. Bear, J. F. Willemsen, J. R. L. Allen, J. Ziman, J.-P. Bouchaud, Joel Koplik, Jysoo Lee, M. Sahimi, P. R. King, S. Havlin, S. Redner   +15 more
core   +1 more source

Is level of neighbourhood green space associated with physical activity in green space? [PDF]

, 2013
Background There is accumulating evidence that greater availability of green space in a neighbourhood is associated with health benefits for the local population.
Mitchell, R., Ord, K., Pearce, J.
core   +2 more sources