Multigrid methods have proven to be eecient methods for solving partial diier-ential equations (especially those of elliptic type). There is also growing experience with multigrid solvers for uids problems, e.g., the Stokes and Navier-Stokes equations (using both nite element and nite diierence discretizations). It is also well known that at the heart of any multigrid method is the smoother. In...

Cloud condensation nuclei properties of model and atmospheric HULIS E. Dinar, I. Taraniuk, E. R. Graber, S. Katsman, T. Moise, T. Anttila, T. F. Mentel, and Y. Rudich Department of Environmental Sciences, Weizmann Institute of Science, Rehovot 76 100, Israel Institute of Soil, Water and Environmental Sciences, The Volcani Center, A.R.O., Bet Dagan 50 250, Israel Institute for Tropospheric Chemi...