Time Element (time + element)

Distribution by Scientific Domains


Selected Abstracts


Towards very high-order accurate schemes for unsteady convection problems on unstructured meshes

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS, Issue 8-9 2005
R. Abgrall
Abstract We construct several high-order residual-distribution methods for two-dimensional unsteady scalar advection on triangular unstructured meshes. For the first class of methods, we interpolate the solution in the space,time element. We start by calculating the first-order node residuals, then we calculate the high-order cell residual, and modify the first-order residuals to obtain high accuracy. For the second class of methods, we interpolate the solution in space only, and use high-order finite difference approximation for the time derivative. In doing so, we arrive at a multistep residual-distribution scheme. We illustrate the performance of both methods on several standard test problems. Copyright © 2005 John Wiley & Sons, Ltd. [source]


The missing link: on the line between C and E

HEALTH ECONOMICS, Issue 8 2003
Werner B.F. Brouwer
Abstract In this paper it is argued that the separation of elements associated with the time spent by the patient is not conducted in a consistent way. This is the case for income (for which there at least has been some attention) and for other time elements like lost unpaid work, leisure and role-functioning. The use of general rather than specific preferences in health state assessments makes the separation of time-elements into costs and effects difficult. While costs are calculated specifically for the patient group under study, effects are normally derived from preferences in the general public. The characteristics of these two groups in terms of (the opportunity of) spending time on activities need not coincide. The use of specific time-group valuations of health states may be a good alternative to using general health state valuations. Copyright © 2002 John Wiley & Sons, Ltd. [source]


Optimal vibration control of continuous structures by FEM: Part I,the optimality equations

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING, Issue 12 2002
W. Szyszkowski
Abstract The governing equations of the problem of optimal vibration control of continuous linear structures are derived in the form of a set of fourth-order ordinary differential equations in the time domain. The equations decouple in the modal space and become suitable for handling by the FEM technique with the time domain subdivided into ,finite time' elements of class C1. It is demonstrated that the standard beam element with cubic Hermitian interpolation functions, routinely used in a static analysis of beams, can conveniently be substituted for the required ,finite time' element. Copyright © 2002 John Wiley & Sons, Ltd. [source]