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Using Local Differential Operators to Model Dispersion in Dielectric Media

Dispersion of electromagnetic waves is usually described in terms of an integro-differential equation. In this paper we show that whenever a differential operator can be found that annihilates the susceptibility kernel of the medium, then dispersion can be modeled by a partial differential equation without nonlocal operators.

HEP Applications Evaluation of the EDG Testbed and Middleware

Workpackage 8 of the European Datagrid project was formed in January 2001 with representatives from the four LHC experiments, and with experiment independent people from five of the six main EDG partners. In September 2002 WP8 was strengthened by the addition of effort from BaBar and D0. The original mandate of WP8 was, following the definition of short- and long-term requirements, to port experim

Computationally efficient damped Capon and APES spectral estimation

In this paper, we introduce computationally efficient imple- mentations of the data-dependent non-parametric damped Capon (dCapon) and APES (dAPES) spectral estimators. These estimators form two-dimensional frequency represen- tations over both frequency and damping, and have been shown to enable an efficient separation of closely spaced spectral lines with different line widths. The proposed impl

Representations, symbols, icons, concepts... and why there are no mental representations

One of the key claims I have defended previously is that longstanding arguments over whether concepts are either (mental) representations or(non-representational) abilities gets its premises fundamentally wrong: concepts must be both. When one reflects on them – when one considers one’s concepts as concepts – they just are representations; but when one possesses and employs them non-reflectively t