Results 41 to 50 of about 5,920 (280)

GVF-based anisotropic diffusion models [PDF]

, 2006
In this paper, the gradient vector flow fields are introduced in image restoration. Within the context of flow fields, the shock filter, mean curvature flow, and Perona-Malik equation are reformulated.
Chua, Chin-seng, Yu, Hongchuan
core   +1 more source

Geodesic nets on non-compact Riemannian manifolds

, 2023
A geodesic flower is a finite collection of geodesic loops based at the same point $p$ that satisfy the following balancing condition: The sum of all unit tangent vectors to all geodesic arcs meeting at $p$ is equal to the zero vector.
Nabutovsky, A., Liokumovich, Y., Chambers, G., Rotman, R.   +3 more
core   +1 more source

An extension of min/max flow framework

, 2009
In this paper, the min/max flow scheme for image restoration is revised. The novelty consists of the fol- 24 lowing three parts. The first is to analyze the reason of the speckle generation and then to modify the 25 original scheme.
Chua, Chin-seng, Yu, Hongchuan, Bennamoun, Mohammed   +2 more
core   +1 more source

Geodesics and Killing vector fields on the tangent sphere bundle [PDF]

Nagoya Mathematical Journal, 1998
Abstract.We show that any Killing vector field on the unit tangent sphere bundle with Sasaki metric of a space of constant curvaturek≠ 1 is fiber preserving by studying some property of geodesies on the bundle. As a consequence, any Killing vector field on the unit tangent sphere bundle of a space of constant curvaturek≠ 1 can be extended to a Killing ...
Konno, Tatsuo, Tanno, Shukichi
openaire   +3 more sources

Some Special Ruled Surfaces Generated by a Direction Curve according to the Darboux Frame and their Characterizations

Abstract and Applied Analysis, 2021
In this work, we consider the Darboux frame T,V,U of a curve lying on an arbitrary regular surface and we construct ruled surfaces having a base curve which is a V-direction curve.
Nidal Echabbi, Amina Ouazzani Chahdi
doaj   +1 more source

Linking community structure and climate vulnerability in desert plant assemblages of southern California

American Journal of Botany, EarlyView.
Abstract Premise Desert plant assemblages in southern California provide an opportunity to link patterns of community structure with climate‐driven vulnerability in a rapidly changing environment. California sustains an exceptionally diverse flora of approximately 4300 plant species, with 31% identified as endemic.
Hector Zumbado‐Ulate, Luis E. Barrios, Danelle A. Baronia, G. Darrel Jenerette, Lynn C. Sweet   +4 more
wiley   +1 more source

Guiding and Manipulating Light Fields in Microstructured Liquid Crystals

Advanced Physics Research, EarlyView.
This review summarizes recent advances in guided‐wave optics enabled by microstructured liquid crystal (LC) devices, covering their fundamental material properties, key degree of freedom for dynamic light field manipulations. The advances of linear guided‐wave optics, nonlinear‐optics with spatial optical solitons, and microlasers in LC‐based devices ...
Shan‐shan Chang, Yong‐shuai Li, Jin‐hui Chen   +2 more
wiley   +1 more source

Geodesic patterns

, 2010
Geodesic curves in surfaces are not only minimizers of distance, but they are also the curves of zero geodesic (sideways) curvature. It turns out that this property makes patterns of geodesics the basic geometric entity when dealing with the cladding of ...
Helmut Pottmann, Qixing Huang, Schiftner, Alexander, Wallner, Johannes, Kilian, Martin, Martin Kilian, Guibas, Leonidas J., Deng, Bailin, Johannes Wallner, Bailin Deng, Pottmann, Helmut, Alexander Schiftner, Leonidas Guibas, Huang, Qixing, Guibas, Leonidas   +14 more
core   +2 more sources

Optimizing Strategies for Non‐Invasive Prospection of Settlements in the Intertidal Zone: A Case Study From the Centre of the Drowned Medieval Village of Tolsende (Scheldt Estuary, the Netherlands)

Archaeological Prospection, EarlyView.
ABSTRACT Medieval and early modern drowned villages in the intertidal zone of the Scheldt estuary (the Netherlands) constitute intriguing yet largely understudied components of north‐western Europe's underwater cultural heritage. Despite their high archaeological potential as time capsules of past settlement landscapes, research has remained limited ...
Jan Trachet, Sarah Bäumler, Stefan Krojer, Jeroen Verhegge, Wim De Clercq, Philippe De Smedt, Wouter H. Maes, Bente S. Majchczack, Immo Trinks, Dennis Wilken   +9 more
wiley   +1 more source

GEODESIC VECTORS ON $5$-DIMENSIONAL HOMOGENEOUS NILMANIFOLDS

Matematički Vesnik
Summary: In this paper, firstly we study geodesic vectors for the \(m\)-th root homogeneous Finsler space admitting \((\alpha,\beta)\)-type. Then we obtain the necessary and sufficient condition for an arbitrary non-zero vector to be a geodesic vector for the \(m\)-th root homogeneous Finsler metric under mild conditions. Finally, we consider a quartic
Shanker, Gauree, Kaur, Jaspreet, Jangir, Seema   +2 more
openaire   +2 more sources