Results 141 to 150 of about 2,867 (260)

Free semigroups of large critical exponent

Journal of Topology, Volume 19, Issue 3, September 2026.
Abstract For a convergence group equipped with an expanding coarse‐cocycle, we construct finitely generated free subsemigroups, which we call Bishop−−Jonessemigroups$\textit{Bishop--Jones semigroups}$, of critical exponent arbitrarily close to but strictly less than the critical exponent of the ambient group.
Aleksander Skenderi
wiley   +1 more source

Mobility-Based Ionization Detector with a Soft X-ray Source. [PDF]

Anal Chem
Piwowarski K, Ławreńczyk J, Kędzierski M, Puton J.   +3 more
europepmc   +1 more source

Surface subgroups for cocompact lattices of isometries of H2n$\mathbb {H}^{2n}$

Journal of Topology, Volume 19, Issue 3, September 2026.
Abstract We prove the existence of surface subgroups within any cocompact lattice Γ$\Gamma$ in SO(2n,1)$\mathrm{SO}(2n,1)$ for n⩾2$n\geqslant 2$. This result addresses the cases missing from the work of Hamenstädt in 2015, who constructed surface subgroups in cocompact lattices for all other rank‐1 simple Lie groups of noncompact type.
Jeremy Kahn, Zhenghao Rao
wiley   +1 more source

Enhancing Spatiotemporal Resolution of MCCA SMAP Soil Moisture Products over China: A Comparative Study of Machine Learning-Based Downscaling Approaches. [PDF]

Sensors (Basel)
Ma Z, Chen P, Chen H, Liu H, Zhang Y, Huang B, Hong Y, Sun S.   +7 more
europepmc   +1 more source

Detecting an Ocean Inside Callisto With Geodetic Measurements From Europa Clipper and Juice

Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.
Abstract Determining whether Callisto hosts a subsurface ocean, and the implications for material and energy transport through its hydrosphere, is of high interest to NASA's Europa Clipper and ESA's Juice missions. A recent reanalysis of Galileo magnetometer data strengthens the ocean hypothesis, but definitive confirmation awaits new measurements.
Flavio Petricca, Gael Cascioli, Erwan Mazarico   +2 more
wiley   +1 more source

Advancing multi-scale plant phenotyping for precision agriculture and sustainable crop production. [PDF]

J Zhejiang Univ Sci B
Feng X, Li Z, Wang K.
europepmc   +1 more source

Seismic Constraints of the 23 November 2025 Hayli Gubbi Eruption Sequence in Afar, Ethiopia

Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.
Abstract On 23 November 2025, the Hayli Gubbi volcano in Afar (Ethiopia) erupted in a massive explosion. We present the first seismic characterization using data from 13 regional seismological stations. Seismograms reveal signals consisting of a minute‐long precursor, a main eruptive phase, and secondary events hours later.
F. Limberger, S. Alemayehu, G. Rümpker, A. Ayele   +3 more
wiley   +1 more source

Employing variance component estimation for point cloud based geometric surface representation by B-splines. [PDF]

J Appl Geod
Ötsch E, Harmening C, Neuner H.
europepmc   +1 more source

Volcanic Eruptions Reorganize Climate Teleconnections: Detection via Riemannian Covariance Fingerprinting

Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.
Abstract Standard detection and attribution of volcanic forcing targets spatial temperature anomalies. We show that the covariance structure of climate variability carries an independent volcanic fingerprint. Applying tangent‐space regression on the symmetric positive definite manifold SPD(8) to 40 years of eight teleconnection indices, we detect ...
Sloan Austermann
wiley   +1 more source

High-Precision Spatial Interpolation of Meteorological Variables in Complex Terrain Using Machine Learning Methods. [PDF]

Sensors (Basel)
Li S, Zhang B, Shi B, Ai Q, Zeng Y, Yan X, Chen H, Wang H.   +7 more
europepmc   +1 more source