Results 101 to 110 of about 3,675 (265)

Medical Image Segmentation by Water Flow

, 2007
We present a new image segmentation technique based on the paradigm of water flow and apply it to medical images. The force field analogy is used to implement the major water flow attributes like water pressure, surface tension and adhesion so that the ...
Nixon, Mark, Liu, Xin
core  

Bi-Hamiltonian structure of a unit geodesic vector field on a 3D space of constant negative curvature

In this work we consider the Riemannian manifold defined by the product of an integral curve of a Cauchy-Riemann vector field on the Poincare upper half -plane and its image in the tangent bundle.
Bayrakdar, T.
core   +1 more source

Vector fields, flows and geodesics on supermanifolds

Champs de vecteurs, flots et géodésiques sur les supervariétés Le résultat principal de cette thèse est de donner une définition de géodésique sur les supervariétés riemanniennes (\ca,g) paires (et aussi impaires) et de la justifier par un théorème reliant les courbes géodésiques avec le flot géodésique sur \text{T}^*\ca. Pour ce faire,
openaire   +2 more sources

On Special Types of Minimal and Totally Geodesic Unit Vector Fields

, 2012
15 ...
openaire   +3 more sources

Leaky Sewers Hydraulically Disconnect from Groundwater: A Proof‐of‐Concept

Groundwater, EarlyView.
In this study, we newly demonstrate that leaky pipes can become hydraulically disconnected from the underlying groundwater—a phenomenon analogous to river–groundwater interactions. Through numerical modeling, we show that, as the groundwater table declines, the leakage flux from the pipe (in absolute terms) initially increases until a critical depth ...
Aaron Peche, Fritz Kalwa, Syed Mohaiminul Islam, Georg Houben, Thomas Graf, Sven Altfelder   +5 more
wiley   +1 more source

Invariant Totally Geodesic Unit Vector Fields on Three-Dimensional Lie Groups

, 2007
We give a complete list of left-invariant unit vector fields on three-dimensional Lie groups equipped with a left-invariant metric that generate a totally geodesic submanifold in the unit tangent bundle of a group equipped with the Sasaki metric.
Yampolsky, A.
core  

Anisotropic dark energy from string compactifications

Journal of High Energy Physics
We explore the cosmological dynamics of a minimalistic yet generic string-inspired model for multifield dark energy. Adopting a supergravity four-dimensional viewpoint, we motivate the model’s structure arising from superstring compactifications ...
Diego Gallego, J. Bayron Orjuela-Quintana, César A. Valenzuela-Toledo   +2 more
doaj   +1 more source

A Non‐Parametric Framework for Correlation Functions on Product Metric Spaces

International Statistical Review, EarlyView.
Summary We propose a non‐parametric framework for analysing data defined over products of metric spaces, a versatile class encountered in various fields. This framework accommodates non‐stationarity and seasonality and is applicable to both local and global domains, such as the Earth's surface, as well as domains evolving over linear time or time ...
Pier Giovanni Bissiri, Bernardo Nipoti, Emilio Porcu, Philip White   +3 more
wiley   +1 more source

Vector Field Design on Surfaces

, 2006
Vector field design on surfaces is necessary for many graphics applications: example-based texture synthesis, non-photorealistic rendering, and fluid simulation. For these applications, singularities contained in the input vector field often cause visual
Greg Turk, Eugene Zhang, Konstantin Mischaikow   +2 more
core  

Einstein Lie groups, geodesic orbit manifolds and regular Lie subgroups [PDF]

We study the relation between two special classes of Riemannian Lie groups $G$ with a left-invariant metric $g$: The Einstein Lie groups, defined by the condition $\operatorname{Ric}_g=cg$, and the geodesic orbit Lie groups, defined by the property that ...
Souris, Nikolaos Panagiotis
core   +1 more source