The Hartree-Fock approximation is of central importance to quantum chemistry. The assumption of electrons interacting with each other through a mean field sim;>lifiesthe electronic structure problem considerably, and provides the starting point for almost all approaches. However,it is curious to note that even this simplifying assumption was not sufficient to make electronic structue calculatio...

The Spiral Model of software development [Boehm, 1988] begins each cycle of the spiral by performing the next level of elaboration of the prospective system's objectives, constraints, and alternatives. A primary difficulty in applying the spiral model has been the lack of explicit process guidance in determining these objectives, constraints, and alternatives. This paper presents an extension o...

Asymptotic dynamics of ordinary differential equations (ODEs) are commonly understood by looking at eigenvalues of a matrix, and transient dynamics can be bounded above and below by considering the corresponding pseudospectra. While asymptotics for other classes of differential equations have been studied using eigenvalues of a (nonlinear) matrix-valued function, there are no analogous pseudosp...

The frequency dependence of the effective permittivities of simple dielectric composites is evaluated by different quasidynamic homogenization methods. Three retrieval approaches based on the scattering parameters are proposed for dielectric materials. A compensation method for the conventional Nicolson-Ross-Weir (NRW) retrieval is applied to eliminate the FabryPérot (FP) resonances and their d...

In this paper, we propose to replace the Chebyshev series used in pseudospectral methods with the equivalent Chebyshev economized power series that can be evaluated more rapidly. We keep the rest of the implementation the same as the spectral method so that there is no new mathematical principle involved. We show by numerical examples that the new approach works well and there is indeed no sign...

For lamellar gratings and other layered periodic structures, the modal methods (including both analytic and numerical ones) are often the most efficient, since they avoid the discretization of one spatial variable. The pseudospectral modal method (PSMM) previously developed for in-plane diffraction problems of one-dimensional gratings achieves high accuracy for a small number of discretization ...

Pseudospectral collocation is employed for the numerical solution of nonlinear two-point boundary value problems with separated end conditions. Second-order finite difference schemes are used as preconditioners for the spectral calculation, and a solution of the discretized equations is obtained using versions of the defect correction principle. The method and a variant based on an adaptive gri...

A pseudospectral method for the analysis of diffractive optical elements is presented. This method is a fullvectorial direct solution of the time-domain Maxwell equations based on a spectral approximation of the spatial derivatives employed within a multidomain framework. The method exhibits little numerical dispersion, and only a few points per wavelength are needed to accurately resolve the p...

Vol. XLVI (October 2009), 573–583 573 © 2009, American Marketing Association ISSN: 0022-2437 (print), 1547-7193 (electronic) *Robert J. Kwortnik Jr. is Associate Professor of Marketing (e-mail: [email protected]), and W. Michael Lynn is Professor of Marketing (e-mail: [email protected]), Cornell University School of Hotel Administration. William T. Ross Jr. is Smeal Research Fellow in Marketing ...

This is an admirable little book which should be in the hands of every medical man in India. It gives in small space a very complete account of our knowledge of the subject of the relations of mosquitoes to malaria, at the present day, and also a sketch of the natural history of some mosquitoes. It begins by giving a short account of the malaria parasite, from its discovery by Laveran. Chapter ...