Concept

Symplectic geometry

Related publications (89)

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Conformal alpha shapes

Mark Pauly

We define a new filtration of the Delaunay triangulation of a finite set of points in &Rdbl;d, similar to the alpha shape filtration. The new filtration is parameterized by a local scale parameter instead of the global scale parameter in alpha s ...

2005

Orthogonal Neighborhood Preserving Projections

Effrosyni Kokiopoulou

Orthogonal Neighborhood Preserving Projections (ONPP) is a linear dimensionality reduction technique which attempts to preserve both the intrinsic neighborhood geometry of the data samples and the global geometry. The proposed technique constructs a weight ...

IEEE2005

Modelling of paramagnetic trivalent silicon defect centres in amorphous silica and at Si-SiO2 interfaces

Alfredo Pasquarello

We review the structural and hyperfine properties of Si dangling bond defects occurring in amorphous SiO2 and at various Si-SiO2 interfaces. These defects have in common a singly occupied orbital on a, trivalent Si Centre. We first briefly summarize the mo ...

2005

Focused electron beam induced deposition of a periodic transparent nano-optic pattern

Patrik Willi Hoffmann, Ivo Utke, Marcel Leutenegger, Silviu Cosmin Sandu, Adrian Bachmann

In this paper we describe the fabrication of a two-dimensional photonic band gap structure by focused electron beam induced deposition. Structure geometry is computed in order to create a light-trapping effect at 632 nm wavelength. Deposits produced using ...

2004

Classical print reflection models: a radiometric approach

Roger Hersch, Mathieu Hébert

The present contribution reviews the classical print prediction models of Williams and Clapper and of Clapper and Yule by pursuing a radiometric approach. The relationship between these models is established and the related respective contributions of Judd ...

Soc. Imaging Sci. & Technol2004

Multiresolution Modeling of Point-Sampled Geometry

Mark Pauly

We present a framework and algorithms for multiresolution modeling of point-sampled geometry. Most of our techniques extend the key ingredients of recent multiresolution editing concepts, including geometry smoothing, simplification, and offset computation ...

2002

Giant magnetoimpedance of chemically thinned and polished magnetic amorphous ribbons

Martinus Gijs, Farid Amalou

We have measured the giant magnetoimpedance (GMI) of microstructured Co-based Metglas (R) 2714a amorphous magnetic ribbons. Before micropatterning, the amorphous ribbons were chemically thinned or polished, to study the influence of sample thickness and su ...

2001

Vibrational amplitudes in vitreous silica

Alfredo Pasquarello

A model structure of vitreous silica, for which the vibrational frequencies and eigenmodes were calculated from first principles, is used to investigate vibrational amplitudes. Calculated mean-square displacements for oxygen and silicon atoms are obtained ...

2000

Geometry Recovery of a Francis Runner Prototype at Site

François Avellan

Geometry recovery of a turbine runner can be of prime importance in at least two cases: upgrading of an old power plant and field repair of a runner. Considering the importance of the field geometry recovery, we have decided to compare three methods of mea ...

International Association For Hydraulic Research1994