Results 71 to 80 of about 715 (188)

Polar Actions on Berger Spheres [PDF]

, 2006
The object of this article is to study a torus action on a so-called Berger sphere. We also make some comments on polar actions on naturally reductive homogeneous spaces. Finally, we prove a rigidity-type theorem for Riemannian manifolds carrying a polar
ANTONIO J. DI SCALA, Di Scala, Antonio Jose'   +1 more
core   +1 more source

Physiological cerebrospinal fluid interactions between brain and eye structures are altered after long‐duration spaceflight

Experimental Physiology, EarlyView.
Abstract Long‐duration spaceflight represents an extreme challenge, triggering adaptive responses including spaceflight‐associated neuro‐ocular syndrome, characterized by diminished visual acuity and ocular changes, which is a significant health risk for Mars missions.
Ge Tang, Steven Jillings, Ben Jeurissen, Elena Tomilovskaya, Inna Nosikova, Alexandra Ryabova, Ekaterina Pechenkova, Viktor Petrovichev, Ilya Rukavishnikov, Stefan Sunaert, Paul M. Parizel, Lyudmila Makovskaya, Valentin Sinitsyn, Jan Sijbers, Jitka Annen, Steven Laureys, Angelique Van Ombergen, Seyed‐Ahmad Ahmadi, Floris L. Wuyts, Peter zu Eulenburg   +19 more
wiley   +1 more source

Homogeneous and two-step homogeneous geodesics in homogeneous spaces

, 2018
The subject of the present thesis is the study of geodesic curves in homogeneous spaces. The problem of determining the form of the geodesic curves in a pseudo-Riemannian manifold is an interesting and in general hard one, and usually reduces to either ...
Σουρής, Νικόλαος-Παναγιώτης, Souris, Nikolaos-Panagiotis   +1 more
core   +1 more source

Invariant Measure and Universality of the 2D Yang–Mills Langevin Dynamic

Communications on Pure and Applied Mathematics, Volume 79, Issue 8, Page 1973-2102, August 2026.
ABSTRACT We prove that the Yang–Mills (YM) measure for the trivial principal bundle over the two‐dimensional torus, with any connected, compact structure group, is invariant for the associated renormalised Langevin dynamic. Our argument relies on a combination of regularity structures, lattice gauge‐fixing and Bourgain's method for invariant measures ...
Ilya Chevyrev, Hao Shen
wiley   +1 more source

On Geodesic Homogeneous Left Lie Loops as Reductive Homogeneous Spaces

, 1999
Two kinds of canonical connections have been introduced by the author for homogeneous (left) Lie loops, one of which is the canonical connection of the reductive homogeneous spaces induced from the homogeneous (left) Lie loops and the other is the ...
Kikkawa, Michihiko
core  

Computational study of permeability in cardboard coating layers

AIChE Journal, Volume 72, Issue 7, July 2026.
Abstract We develop a virtual material structure model based on a combination of tessellations and Gaussian random fields for a coating layer of paperboard used for packaging and designed to facilitate printing on the surface. To fit the model to tomographic image data acquired using combined focused ion beam and scanning electron microscopy (FIB‐SEM),
Sandra Barman, Torben Nilsson Pingel, Niklas Lorén, Tobias Gebäck, Eva Olsson, Aila Särkkä, Magnus Röding   +6 more
wiley   +1 more source

The Existence of Two Homogeneous Geodesics in Finsler Geometry [PDF]

Symmetry, 2019
The existence of a homogeneous geodesic in homogeneous Finsler manifolds was positively answered in previous papers. However, the result is not optimal. In the present paper, this result is refined and the existence of at least two homogeneous geodesics in any homogeneous Finsler manifold is proved.
openaire   +1 more source

Metrics with homogeneous geodesics on flag manifolds [PDF]

, 2002
summary:A geodesic of a homogeneous Riemannian manifold $(M=G/K, g)$ is called homogeneous if it is an orbit of an one-parameter subgroup of $G$. In the case when $M=G/H$ is a naturally reductive space, that is the $G$-invariant metric $g$ is defined by ...
Alekseevsky, Dmitri, Arvanitoyeorgos, Andreas   +1 more
core  

Beyond Average Hive Performance: Tail Risk Measurement in Italian Apiculture With Honey‐at‐Risk

Environmetrics, Volume 37, Issue 5, July 2026.
ABSTRACT This paper provides a framework for measuring honey‐production risk that complements standard mean‐based analyses by explicitly targeting downside tail risk. Using hive‐weight data from a large sample of Italian hives over the period 2021–2024, downside tail risk is quantified through the Honey‐at‐Risk (HaR) metric, defined as the quantile of ...
Alessio Brini, Giacomo Toscano, Ginevra Virginia Lombardi, Maria Elvira Mancino   +3 more
wiley   +1 more source

Healthy core: Harmonizing brain MRI for supporting multicenter migraine classification studies.

PLoS ONE
Multicenter and multi-scanner imaging studies may be necessary to ensure sufficiently large sample sizes for developing accurate predictive models. However, multicenter studies, incorporating varying research participant characteristics, MRI scanners ...
Hyunsoo Yoon, Todd J Schwedt, Catherine D Chong, Oyekanmi Olatunde, Teresa Wu   +4 more
doaj   +1 more source