Results 71 to 80 of about 22,008 (172)
Cosmological solutions in multidimensional model with multiple exponential potential
, 2003 A family of cosmological solutions with $(n+1)$ Ricci-flat spaces in the theory with several scalar fields and multiple exponential potential is obtained when coupling vectors in exponents obey certain relations.
Alexey B Selivanov +42 more
core +1 more source
European Physical Journal C: Particles and FieldsIn this letter, we investigate behaviour of massive and massless scalar field that is represented by the covariant Klein–Gordon equation with Bocharova–Bronnikov–Melnikov–Bekenstein (BBMB) black hole background.
David Senjaya
doaj +1 more source
MODERN CHALLENGES OF ENSURING EFFECTIVE AND RESPONSIBLE CIVIL SERVICE
Освітній дискурсUrgency of the research. Civil service is the core of management activity in any country. The political-legal, socio-economic, spiritual and cultural progress of the country, ultimately the level of its subjectivity in the international arena, directly ...
Tetyana Kopil-Filatova
doaj +1 more source
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 +6 more
wiley +1 more source
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 +10 more
wiley +1 more source
Some remarks on the Melnikov function
Electronic Journal of Differential Equations, 2002 The authors study the system \[ x'=f(x)+\varepsilon h(t+\alpha,x,\varepsilon), \] where \(\varepsilon\) is a small parameter. It is assumed that if \(\varepsilon=0\), then the system has a nondegenerate homoclinic solution \(\phi(t)\). The Melnikov function \(M(\alpha)\) is studied in the case where \(\phi(t)=\Phi(e^t)\) for a rational function \(\Phi\)
Flaviano Battelli, Michal Feckan
openaire +2 more sources
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 +8 more
wiley +1 more source
The billiard inside an ellipse deformed by the curvature flow
, 2015 The billiard dynamics inside an ellipse is integrable. It has zero topological entropy, four separatrices in the phase space, and a continuous family of convex caustics: the confocal ellipses.
Carneiro, Mario J. Dias +2 more
core
Heteroclinic orbits and transport in a perturbed integrable Suris map
, 1996 Explicit formulae are given for the saddle connection of an integrable family of standard maps studied by Y. Suris. When the map is perturbed this connection is destroyed, and we use a discrete version of Melnikov's method to give an explicit formula for
Lomeli, H. E., Meiss, J. D.
core +3 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 +3 more
wiley +1 more source