Results 61 to 70 of about 12,537 (310)

On geodesic mappings of symmetric pairs

Pracì Mìžnarodnogo Geometričnogo Centru, 2023
The paper treats properties of pseudo-Riemannian spaces admitting non-trivial geodesic mappings. A symmetric pair of pseudo-Riemannian spaces is a pair of spaces with coinciding values of covariant derivatives for their Riemann tensors. It is proved that
Volodymyr Kiosak, Olexandr Lesechko, Olexandr Latysh   +2 more
doaj   +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

Resolvents for Convex Functions on Geodesic Spaces and Their Nonspreadingness

Axioms
The convex optimization problems have been considered by many researchers on geodesic spaces. In these problems, the resolvent operators play an important role.
Takuto Kajimura, Yasunori Kimura, Fumiaki Kohsaka   +2 more
doaj   +1 more source

On geometric polygroups

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2020
In this paper, we introduce a geodesic metric space called generalized Cayley graph (gCay(P,S)) on a finitely generated polygroup. We define a hyperaction of polygroup on gCayley graph and give some properties of this hyperaction.
Arabpur F., Jafarpour M., Aminizadeh M., Hoskova-Mayerova S.   +3 more
doaj   +1 more source

Geodesics in the TPS Space

Mathematics, 2022
In shape analysis, the interpolation of shapes’ trajectories is often performed by means of geodesics in an appropriate Riemannian Shape Space. Over the past several decades, different metrics and shape spaces have been proposed, including Kendall shape space, LDDMM based approaches, and elastic contour, among others. Once a Riemannian space is chosen,
Valerio Varano, Stefano Gabriele, Franco Milicchio, Stefan Shlager, Ian Dryden, Paolo Piras   +5 more
openaire   +4 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

On-line learning of shape information for object segmentation and tracking [PDF]

, 2009
We present segmentation and tracking of deformable objects using non-linear on-line learning of high-level shape information in the form of a level set function.
Chiverton, John, John, Chiverton, John Chiverton, Xianghua Xie, Xie, Xianghua, Majid Mirmehdi, Mirmehdi, Majid, Xianghua, Xie   +7 more
core   +1 more source

Scrutinizing the Wallacean shortfall: global gaps in snake occurrence data across space and environment

Ecography, EarlyView.
Occurrence records are fundamental for ecological and evolutionary research, providing key information on species' geographic ranges. However, these records are often taxonomically, spatially, and temporally biased, requiring caution in their use. Here, we analysed the spatial coverage of occurrence records for over 3500 snake species worldwide to ...
Lívia Frateles, Cristina Ronquillo, Gabriel Nakamura, José Alexandre Felizola Diniz‐Filho, Richard James Ladle, Joaquín Hortal   +5 more
wiley   +1 more source

Spaces of geodesics: products, coverings, connectedness [PDF]

Geometriae Dedicata, 1996
We continue our study of the space of geodesics of a manifold with linear connection. We obtain sufficient conditions for a product to have a space of geodesics which is a manifold. We investigate the relationship of the space of geodesics of a covering manifold to that of the base space.
Beem, John K., Low, Robert J., Parker, Phillip E.   +2 more
openaire   +2 more sources

The 2025 Kamchatka Earthquake and Tsunami: Cascading Impacts and Risks to Japan

Earthquake Engineering &Structural Dynamics, EarlyView.
ABSTRACT On July 29th, 2025, a large earthquake (Mw 8.8) occurred near the Kamchatka Peninsula. This event caused a tsunami that reached Japan's Pacific coast, even though the source was far away. In this study, we analyze the characteristics of earthquakes and tsunamis and discuss how they relate to the recurrence possibility and risk in Japan.
Ampan Laosunthara, An‐Chi Cheng, Yo Fukushima, Yoshinori Shigihara, Natt Leelawat, Anawat Suppasri, Fumihiko Imamura   +6 more
wiley   +1 more source