Results 121 to 130 of about 17,955 (266)

Concentration of eigenfunctions of the Laplacian on a closed Riemannian manifold [PDF]

open access: yesarXiv, 2017
We study concentration phenomena of eigenfunctions of the Laplacian on closed Riemannian manifolds. We prove that the volume measure of a closed manifold concentrates around nodal sets of eigenfunctions exponentially. Applying the method of Colding and Minicozzi we also prove restricted exponential concentration inequalities and restricted Sogge-type ...
arxiv  

Neural Geometry Processing via Spherical Neural Surfaces

open access: yesComputer Graphics Forum, EarlyView.
Abstract Neural surfaces (e.g., neural map encoding, deep implicit, and neural radiance fields) have recently gained popularity because of their generic structure (e.g., multi‐layer perceptron) and easy integration with modern learning‐based setups. Traditionally, we have a rich toolbox of geometry processing algorithms designed for polygonal meshes to
Romy Williamson, Niloy J. Mitra
wiley   +1 more source

S‐ACORD: Spectral Analysis of COral Reef Deformation

open access: yesComputer Graphics Forum, EarlyView.
Abstract We propose an efficient pipeline to register, detect, and analyze changes in 3D models of coral reefs captured over time. Corals have complex structures with intricate geometric features at multiple scales. 3D reconstructions of corals (e.g., using Photogrammetry) are represented by dense triangle meshes with millions of vertices.
Naama Alon‐Borissiouk   +3 more
wiley   +1 more source

Spectral Properties of the Laplace Operator with Variable Dependent Boundary Conditions in a Disk

open access: yesAxioms
In this work, we study the spectral properties of the Laplace operator with variable dependent boundary conditions in a disk. The boundary conditions include periodic and antiperiodic boundary conditions as well as the generalized Samarskii–Ionkin-type ...
Aishabibi Dukenbayeva, Makhmud Sadybekov
doaj   +1 more source

Value distribution for eigenfunctions of desymmetrized quantum maps [PDF]

open access: yesarXiv, 2001
We study the value distribution and extreme values of eigenfunctions for the ``quantized cat map''. This is the quantization of a hyperbolic linear map of the torus. In a previous paper it was observed that there are quantum symmetries of the quantum map - a commutative group of unitary operators which commute with the map, which we called ``Hecke ...
arxiv  

Clustering Longitudinal Data: A Review of Methods and Software Packages

open access: yesInternational Statistical Review, EarlyView.
Summary Clustering of longitudinal data is becoming increasingly popular in many fields such as social sciences, business, environmental science, medicine and healthcare. However, it is often challenging due to the complex nature of the data, such as dependencies between observations collected over time, missingness, sparsity and non‐linearity, making ...
Zihang Lu
wiley   +1 more source

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