Binding of Oppositely Charged Membranes and Membrane Reorganization

We consider the electrostatic interaction between two rigid membranes, with different surface charge densities of opposite sign, across an aqueous solution without added salt. Exact solutions to the nonlinear Poisson-Boltzmann equation are obtained and their physical meaning discussed. We also calculate the electrostatic contribution to the free energy and discuss the renormalization of the area per head group of the charged lipids arising from the Coulomb interaction.Comment: 13 pages, 6 figures, to be published in EJP

IMEX evolution of scalar fields on curved backgrounds

Inspiral of binary black holes occurs over a time-scale of many orbits, far longer than the dynamical time-scale of the individual black holes. Explicit evolutions of a binary system therefore require excessively many time steps to capture interesting dynamics. We present a strategy to overcome the Courant-Friedrichs-Lewy condition in such evolutions, one relying on modern implicit-explicit ODE solvers and multidomain spectral methods for elliptic equations. Our analysis considers the model problem of a forced scalar field propagating on a generic curved background. Nevertheless, we encounter and address a number of issues pertinent to the binary black hole problem in full general relativity. Specializing to the Schwarzschild geometry in Kerr-Schild coordinates, we document the results of several numerical experiments testing our strategy.Comment: 28 pages, uses revtex4. Revised in response to referee's report. One numerical experiment added which incorporates perturbed initial data and adaptive time-steppin

Family Comes First: A Family-based Resource Model for the Wife’s Pre-migration Adjustment When Couples Live Apart

NCPS-AsPh3 is a soluble polymer-supported triphenylarsine that performed equally well compared to free triphenylarsine as ligands in the Stille cross-coupling reaction of organic electrophiles and organostannanes, with the advantage that it can be conveniently and efficiently separated from the reaction by precipitation, and recycled for further use. The performance of this non-cross-linked polystyrene-supported arsine was found to be generally superior in Stille coupling reactions over the analogous polymer-supported phosphine, paralleling observations on the free ligands. Palladium-catalyzed modification of the polymer-supported arsine was possible through Pd-Ar/As-Ph exchange. Exploiting the ease of isolation of the polymer-supported reagent, the modified arsine is recycled for reuse in the Stille reaction and has led to a reduction in the yield of undesired scrambling products. © 2007 Elsevier Ltd. All rights reserved.postprin

Social Security Incentives and Human Capital Investment

While the effect of social security systems on retirement decisions has received much attention, there are no analytical results on the impact of these systems on individual incentives to invest in human capital. We integrate human capital investment and retirement decisions in an analytical life-cycle model with full certainty and investigate how different social security schemes may affect human capital investment and labor supply. We analyze and compare three different social security systems, differing on whether benefits are conditional on withdrawal from the labor market and on previous income

Thinking out of the box?What teachers must do to foster higher order thinking skills in accounting graduates.

This paper addresses the concern that accounting education is inadequate in equipping accounting graduates for the challenges of today' s workforce. The study posits that students need to be taught higher-order thinking skills and to engage in deep learning in order to succeed in today's workplace. The underlying belief is deep learning is hard work and unless students are taught critical thinking skills, they cannot initiate deep learning, let alone sustain the effort