Results 81 to 90 of about 26,339 (212)

Substitutional Sulfur and Its Vibrational Fingerprints in Sb2Se3

physica status solidi (RRL) – Rapid Research Letters, Volume 20, Issue 2, February 2026.
The microscopic configurations of sulfur incorporated into the Sb2$_2$Se3$_3$ lattice are studied by combining infrared absorption spectroscopy with density functional theory. Substitutional SSe$_{\mathrm{Se}}$ defects are identified as the origin of four distinct sulfur‐related local vibrational modes at 249, 273, 283, and 312 cm−1$^{-1}$.
Frank Herklotz, Eduard V. Lavrov, Vladlen V. Melnikov, Andreas Herklotz, Thomas P. Shalvey, Jon D. Major, Ken Durose   +6 more
wiley   +1 more source

Singular Separatrix Splitting and the Melnikov Method: An Experimental Study [PDF]

Experimental Mathematics, 1999
We consider families of analytic area-preserving maps depending on two pa- rameters: the perturbation strength E and the characteristic exponent h of the origin. For E=0, these maps are integrable with a separatrix to the origin, whereas they asymptote to flows with homoclinic connections as h->0+.
Delshams, Amadeu, Ramírez-Ros, Rafael
openaire   +2 more sources

Long‐Term Increases in Ca2+, Mg2+, and SO42− Concentrations in the Kolyma River (1980–2022) Due To Yedoma Degradation

Global Biogeochemical Cycles, Volume 40, Issue 2, February 2026.
Abstract Permafrost degradation under a warming climate has altered hydrological and biogeochemical processes across the Arctic. Although increasing fluxes of weathering‐derived ions (e.g., Ca2+, Mg2+, and SO42−) have been reported in Arctic rivers, the underlying mechanisms and hotspots within basins remain poorly understood due to limited analysis of
Y. Tashiro, T. Hiyama, H. Kanamori, L. Lebedeva, H. Park, O. Makarieva, P. Nikitina, S. R. Fassnacht, A. Zemlianskova, O. Zhunusova, K. Suzuki   +10 more
wiley   +1 more source

Chaotic Behaviors and Coexisting Attractors in a New Nonlinear Dissipative Parametric Chemical Oscillator

Complexity, 2022
In this study, complex dynamics of Briggs–Rauscher reaction system is investigated analytically and numerically. First, the Briggs–Rauscher reaction system is reduced into a new nonlinear parametric oscillator.
Y. J. F. Kpomahou, A. Adomou, J. A. Adéchinan, A. E. Yamadjako, I. V. Madogni   +4 more
doaj   +1 more source

Toward a standardization of cryostructure and cryogenic soil structure terminology for the field description of permafrost‐affected soils

Soil Science Society of America Journal, Volume 90, Issue 1, January/February 2026.
Abstract This paper establishes standardized terminology and field documentation protocols for cryostructures and cryogenic soil structures in permafrost‐affected soils and provides brief guidance on descriptions of ground ice morphology and ice volume estimates.
Megan L. Andersen, Mikhail Kanevskiy, Chien‐Lu Ping, M. Torre Jorgenson, Yuri Shur, Julie D. Jastrow, Roser Matamala, Erin C. Rooney, Nicolas A. Jelinski   +8 more
wiley   +1 more source

Spectral conservation laws for periodic nonlinear equations of the Melnikov type

, 2008
We consider the nonlinear equations obtained from soliton equations by adding self-consistent sources. We demonstrate by using as an example the Kadomtsev-Petviashvili equation that such equations on periodic functions are not isospectral.
Grinevich, P. G., Taimanov, I. A.
core   +2 more sources

Method for Noise‐Induced Regularization in Quantum Neural Networks

Advanced Quantum Technologies, Volume 8, Issue 12, December 2025.
Controllable decoherence is proposed to be used as a regulariser for quantum neural networks. Tuning amplitude, phase, and depolarising noise strengths as hyperparameters can result in minimizing validation error during training. Hardware‐realistic noisy simulation of IBM's Kingston processor shows that inserting controllable idle intervals can achieve
Viacheslav Kuzmin, Wilfrid Somogyi, Ekaterina Pankovets, Alexey Melnikov   +3 more
wiley   +1 more source

Nomenclature and typification of sectional names in Carex (Cyperaceae)

TAXON, Volume 74, Issue 6, Page 1543-1568, December 2025.
Abstract This paper presents an updated survey of all the published names at the section rank in Carex and its formerly accepted satellite genera. We included related names at other ranks when relevant. We address validity, legitimacy, priority, typification, and – if relevant – synonymy.
Pedro Jiménez‐Mejías, James L. Reveal, Santiago Martín‐Bravo, Juan Carlos Zamora, Isabel Larridon, Anton A. Reznicek, Robert F.C. Naczi   +6 more
wiley   +1 more source

Nonpersistence of resonant caustics in perturbed elliptic billiards

, 2011
Caustics are curves with the property that a billiard trajectory, once tangent to it, stays tangent after every reflection at the boundary of the billiard table.
Abramowitz, Birkhoff, Poncelet, RAFAEL RAMÍREZ-ROS, Rothos, SÔNIA PINTO-DE-CARVALHO, Tabachnikov, Whittaker   +7 more
core   +1 more source

Probing the local structure of Bi2O3 chemical derivatives: the neglected cation sublattice

Acta Crystallographica Section B, Volume 81, Issue 6, Page 595-604, December 2025.
The importance of the cation sublattice in influencing both the average and local structures of δ‐Bi2O3‐like phases is highlighted. It also reveals the inadequacy of conventional average structural analysis methods in describing comprehensively the structure of real materials.High‐resolution synchrotron X‐ray diffraction data confirm the stabilization ...
Sikhumbuzo M. Masina, Gugulethu C. Nkala, Kevin H. Stone, Daniel Olds, Caren Billing, David G. Billing   +5 more
wiley   +1 more source