Naval Postgraduate School

About: Naval Postgraduate School is a education organization based out in Monterey, California, United States. It is known for research contribution in the topics: Tropical cyclone & Nonlinear system. The organization has 5246 authors who have published 11614 publications receiving 298300 citations. The organization is also known as: NPS & U.S. Naval Postgraduate School.

Explosive Connections? Mass Media, Social Media, and the Geography of Collective Violence in African States

Abstract: Growing evidence indicates that the diffusion of information and communication technologies (ICTs) can substantially alter the contours of collective violence in developing nations. However, empiri...

Balanced boundary layers used in hurricane models

Abstract: We examine the formulation and accuracy of various approximations made in representing the boundary layer in simple axisymmetric hurricane models, especially those that assume strict gradient wind balance in the radial direction. Approximate solutions for a steady axisymmetric slab boundary-layer model are compared with a full model solution. It is shown that the approximate solutions are generally poor in the inner core region of the vortex, where the radial advection term in the radial momentum equation is important and cannot be neglected. These results affirm some prior work and have implications for a range of theoretical studies of hurricane dynamics, including theories of potential intensity, that employ balanced boundary-layer formulations. Copyright c � 2008 Royal Meteorological Society

A high‐order triangular discontinuous Galerkin oceanic shallow water model

Abstract: A high-order triangular discontinuous Galerkin (DG) method is applied to the two-dimensional oceanic shallow water equations. The DG method can be characterized as the fusion of finite elements with finite volumes. This DG formulation uses high-order Lagrange polynomials on the triangle using nodal sets up to 15th order. Both the area and boundary integrals are evaluated using order 2N Gauss cubature rules. The use of exact integration for the area integrals leads naturally to a full mass matrix; however, by using straight-edged triangles we eliminate the mass matrix completely from the discrete equations. Besides obviating the need for a mass matrix, triangular elements offer other obvious advantages in the construction of oceanic shallow water models, specifically the ability to use unstructured grids in order to better represent the continental coastlines for use in tsunami modeling. In this paper, we focus primarily on testing the discrete spatial operators by using six test cases—three of which have analytic solutions. The three tests having analytic solutions show that the high-order triangular DG method exhibits exponential convergence. Furthermore, comparisons with a spectral element model show that the DG model is superior for all polynomial orders and test cases considered. Copyright © 2007 John Wiley & Sons, Ltd.

The Effect of Medicaid Payment Generosity on Access and Use among Beneficiaries

Abstract: This study examines the effects of Medicaid payment generosity on access and care for Medicaid adults and children. We used data from the National Surveys of America's Families for 1997, 1999, and 2002 and the Urban Institute Medicaid capitation rate surveys. Higher payment rates improve some aspects of care for Medicaid beneficiaries, but the effects are not dramatic. Higher payments increase the probability of having a usual source of care and having at least one visit to a doctor or other health professional for Medicaid adults, and produce more positive assessments of the health care received by adults and children. (Shen, Yu-Chu and Zuckerman, Stephen. June 2005. The Effect of Medicaid Payment Levels on Access and Use Among Beneficiaries. Health Services Research 40(3): 723-744.)