Non-point agricultural pollution is a major concern in groundwater management. To investigate nitrate input to the subsurface through groundwater recharge, thirteen natural springs were sampled. Discharge, electrical conductivity (EC), nitrate concentration, pH value and water temperature were monitored every two weeks from January 2010 till February 2011 at selected springs in the Osona region...

The manuscript aims to report the results of investigation of wave propagation in a 1D chain of particles with randomly assigned masses. The particles are connected by longitudinal springs with power law dependence between the force and displacement. The exponent is assumed either 0 (conventional linear spring) or 0.5 (Hertzian contact). The manuscript however considers only linear contacts (ex...

Y. Choi,1,2 D. Haskel,2 R. E. Camley,3 D. R. Lee,2 J. C. Lang,2 G. Srajer,2 J. S. Jiang,4 and S. D. Bader4 1Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA 2Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA 3Department of Physics, University of Colorado, Colorado Springs, Colorado 80907, USA 4Materials Scien...

of Nd (4f) in GaN John B. Gruber, Gary W. Burdick, Nathaniel T. Woodward, Volkmar Dierolf, Sreerenjini Chandra, and Dhiraj K. Sardar Department of Physics and Astronomy, The University of Texas at San Antonio, San Antonio, Texas 78249–0697, USA Department of Physics, Andrews University, Berrien Springs, Michigan 49104–0380, USA Department of Physics, Lehigh University, 16 Memorial Drive East, B...

A systematic experimental study and theoretical modeling of the device physics of polydimethylsiloxane "pushdown" microfluidic valves are presented. The phase space is charted by 1587 dimension combinations and encompasses 45-295 μm lateral dimensions, 16-39 μm membrane thickness, and 1-28 psi closing pressure. Three linear models are developed and tested against the empirical data, and then co...

Under 5 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186 6.7 5 to 9 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214 7.7 10 to 14 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251 9.1 15 to 19 years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209 7.5 20 to 24 years . . . . . . . . . . . . . . . . . . . . ....

In recent years a number of red-blood-cell (RBC) models have been proposed using spring networks to represent the RBC membrane. Some results predicted by these models agree well with experimental measurements. However, the suitability of these membrane models has been questioned. The RBC membrane, like a continuum membrane, is mechanically isotropic throughout its surface, but the mechanical pr...

We introduce and study a minimal 1D model for the simulation of dynamic friction and dissipation at the atomic scale. This model consists of a point mass (slider) that moves over and interacts weakly with a linear chain of particles interconnected by springs, representing a crystalline substrate. This interaction converts a part of the kinetic energy of the slider into phonon waves in the subst...

The Markovian assumption stating that memory effects can be neglected is a crucial assumption in the theory of coarse-graining. We investigate the coarse-graining of a one-dimensional chain of oscillators where the atoms are grouped into clusters or blobs. When the interaction between oscillators is through Hookean springs, the cluster dynamics is non-Markovian, as has been recently noted by Cu...