Results 41 to 50 of about 3,777 (153)

Complex geometry of moment-angle manifolds

, 2016
Moment-angle manifolds provide a wide class of examples of non-Kaehler compact complex manifolds. A complex moment-angle manifold Z is constructed via certain combinatorial data, called a complete simplicial fan.
Panov, Taras, Ustinovsky, Yuri, Verbitsky, Misha   +2 more
core   +1 more source

Signature of quaternionic Kaehler manifolds

Proceedings of the Japan Academy, Series A, Mathematical Sciences, 1983
Quaternionic Kähler manifolds have analogues of the Hard-Lefschetz theorem and the Hodge index theorem. The latter on the signature is simpler and clear cut. Let M be a compact connected quaternionic Kähler manifold of positive scalar curvature with dimension 4n. Theorem 1. \[ H^{2p}(M)=\sum_{2k\leq p}(L_{\Omega})^ k P^{2p-4k}(M),\quad p\leq n, \] and \
Nagano, Tadashi, Takeuchi, Masaru
openaire   +2 more sources

Climatology of Medium‐Scale Traveling Ionospheric Disturbances Over Continental US Using GNSS TEC From 2012 to 2023

Journal of Geophysical Research: Space Physics, Volume 131, Issue 1, January 2026.
Abstract Medium‐Scale Traveling Ionospheric Disturbances (MSTIDs) have long been a subject of interest in ionospheric research. However, their spatiotemporal variability across regions, local times, seasons, and solar cycles is very complicated and remains not well established.
Jing Liu, Shun‐Rong Zhang, Anthea J. Coster, Philip J. Erickson, Hanli Liu   +4 more
wiley   +1 more source

On totally umbilical CR-submanifolds of a Kaehler manifold

International Journal of Mathematics and Mathematical Sciences, 1993
Let M be a compact 3-dimensional totally umbilical CR-submanifold of a Kaehler manifold of positive holomorphic sectional curvature. We prove that if the length of the mean curvature vector of M does not vanish, then M is either diffeomorphic to S3 or ...
M. A. Bashir
doaj   +1 more source

Functional generalism in plant–hummingbird interactions: Causes and consequences from a plant perspective

Functional Ecology, Volume 39, Issue 11, Page 3339-3350, November 2025.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Plant species pollinated by animals differ in the pool of visitors they attract. Some attract functionally similar animals, while others engage with a broader set of functionally distinct visitors; we term this species‐level variation functional generalism.
Ricardo Sánchez‐Martín, Elisa Barreto, François Duchenne, Isabela Galarda Varassin, María Maglianesi, Boris Tinoco, Catherine H. Graham   +6 more
wiley   +1 more source

Manifolds with parallel differential forms and Kaehler identities for G_2-manifolds

, 2008
Let M be a compact Riemannian manifold equipped with a parallel differential form \omega. We prove a version of Kaehler identities in this setting. This is used to show that the de Rham algebra of M is weakly equivalent to its subquotient $(H^*_c(M), d)$,
Acharya, Alekseevsky, Atiyah, Babenko, Barannikov, Berger, Bonan, Bryant, Bryant, Bryant, Cavalcanti, de Rham, Deligne, Dijkgraaf, Donaldson, Dwyer, Fernandez, Fernandez, Fernandez, Goldman, Gukov, Halperin, Harvey, Hitchin, Hitchin, Joyce, Joyce, Kovalev, Leung, Miller, Misha Verbitsky, Quillen, Salamon, Sullivan, Tao, Tian, Tralle, Vaisman, Verbitsky   +38 more
core   +1 more source

Hummingbird flower visitation rates vary with species traits, floral abundance and phenology across bioregions

Oikos, Volume 2025, Issue 9, September 2025.
A myriad of factors influence species interactions, and determining their relative importance is a major challenge in community ecology. Here, we explored the multiple factors influencing hummingbird visitation rates to flowers by considering pollinator and floral traits alongside the broader ecological context (i.e.
Elisa Barreto, François Duchenne, Holger Beck, Carolina Bello, Rafaela Bobato, Emanuel Brenes, Daniela Bôlla, Nicole Büttner, Ana Paula Caron, José Alejandro Castro, Nelson Chaves‐Elizondo, María José Gavilanes, Esteban A. Guevara, Miriam Kaehler, Tiago Machado‐de‐Souza, Miguel Machnicki-Reis, Andrés S. Marcayata‐Fajardo, Cauã G. de Menezes, Andrea Nieto, Rafael de Oliveira, Ricardo A. C. de Oliveira, Alejandro Restrepo-González, Friederike Richter, Bryan G. Rojas, Luciele L. Romanowski, Ricardo Sánchez-Martín, Romulo C. da Silva, Wellinton Luiz de Souza, Danila S. Veluza, Ben Weinstein, Rafael Wüest, Thais B. Zanata, Krystal Zuniga, Tatiana Santander, Maria A. Maglianesi, Isabela G. Varassin, Catherine H. Graham   +36 more
wiley   +1 more source

Research Review: Mechanisms of change and between‐family differences in parenting interventions for children with ADHD – an individual participant data meta‐analysis

Journal of Child Psychology and Psychiatry, Volume 66, Issue 9, Page 1304-1319, September 2025.
Background Understanding the mechanisms of change and between‐family differences in behavioural parenting interventions for children with attention‐deficit/hyperactivity disorder (ADHD) may help personalise interventions. Therefore, we examined whether improvements in parenting are associated with changes in child behaviour and functional outcomes, and
Constantina Psyllou, Marjolein Luman, Barbara J. van den Hoofdakker, Saskia Van der Oord, Asma Aghebati, Bianca Boyer, Jan Buitelaar, Andrea Chronis‐Tuscano, David Daley, Tycho J. Dekkers, George J. DuPaul, Gregory A. Fabiano, Maite Ferrin, Nike Franke, Naama Gershy Tsahor, Elizabeth Harvey, Timo Hennig, Sharonne Herbert, Pieter J. Hoekstra, Lee Kern, Jennifer A. Mautone, Amori Yee Mikami, Sébastien Normand, Linda J. Pfiffner, Shizuka Shimabukuro, Satyam Antonio Schramm, Julie B. Schweitzer, Margaret H. Sibley, Edmund Sonuga‐Barke, Catherine Thompson, Margaret J. Thompson, Gail Tripp, Carolyn Webster‐Stratton, Yuhuan Xie, Patty Leijten, Annabeth P. Groenman   +35 more
wiley   +1 more source

On the Scalar Curvature of Complex Surfaces

, 1994
Let (M,J) be a minimal compact complex surface of Kaehler type. It is shown that the smooth 4-manifold M admits a Riemannian metric of positive scalar curvature iff (M,J) admits a KAEHLER metric of positive scalar curvature. This extends previous results
A. Lichnerowicz, C. LeBrun, C. LeBrun, C.H. Taubes, E. Witten, M. Gromov, N.J. Hitchin, N.J. Hitchin, P. Kronheimer, R. Schoen, S.-T. Yau   +10 more
core   +2 more sources

The Motion Picture: Leveraging Movement to Enhance AI Object Detection in Ecology

Ecology and Evolution, Volume 15, Issue 8, August 2025.
As AI methods become increasingly popular to automatically analyse ecology data, we investigate using movement information as a means to improve traditional object detection approaches (which are limited to static image information only) on over 35,000 annotated images from 1480 terrestrial, marine and freshwater locations, the most extensive ...
Ben Maslen, Gordana Popovic, Dadong Wang, Andrew Jansen, David Warton   +4 more
wiley   +1 more source