Results 61 to 70 of about 1,440 (207)

A Mountain Pass to the Jacobian Conjecture [PDF]

open access: yes, 1998
This paper presents an approach to injectivity theorems via the Mountain Pass Lemma and raises an open question. The main result of this paper (Theorem 1.1) is proved by means of the Mountain Pass Lemma and states that if the eigenvalues of are ...
Marc Chamberland, Gary Meisters
core   +1 more source

First Detection of the Two‐Dimensional Vertical Propagation of Traveling Ionospheric Disturbances Associated With Atmospheric Gravity Waves in the Martian Ionosphere

open access: yesGeophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract We report the detection of a traveling ionospheric disturbance (TID) captured by the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) Active Ionospheric Sounding (AIS) instrument aboard the Mars Express spacecraft at 150–250 km altitude.
Rong Tian   +10 more
wiley   +1 more source

Existence and multiplicity of solutions involving the $ p(x) $-Laplacian equations: On the effect of two nonlocal terms [PDF]

open access: yes, 2023
We study a class of $p(x)$-Kirchhoff problems which is seldom studied because the nonlinearity has nonstandard growth and contains a bi-nonlocal term.
Dušan D. Repovš   +9 more
core   +1 more source

Existence and multiplicity of solutions for a differential inclusion problem involving the p(x)-Laplacian

open access: yesElectronic Journal of Differential Equations, 2010
In this article we consider the differential inclusion $$displaylines{ -hbox{div}(| abla u|^{p(x)-2} abla u)in partial F(x,u) quadhbox{in }Omega,cr u=0 quad hbox{on }partial Omega }$$ which involves the $p(x)$-Laplacian.
Guowei Dai
doaj  

Existence, Non‐Existence, and Uniqueness of Solutions for a Generalized Fractional p‐Kirchhoff Equation

open access: yesMathematische Nachrichten, Volume 299, Issue 5, Page 1004-1027, May 2026.
ABSTRACT This paper investigates the existence and non‐existence and uniqueness of global solutions for certain parameter values c$c$ in a new class of generalized fractional p$p$‐Kirchhoff equations in the whole space. Using the Pohozaev and Nehari identities for an auxiliary problem, together with the fractional Gagliardo–Nirenberg inequality and the
J. Vanterler da C. Sousa   +2 more
wiley   +1 more source

On Neumann hemivariational inequalities

open access: yesAbstract and Applied Analysis, 2002
We derive a nontrivial solution for a Neumann noncoercive hemivariational inequality using the critical point theory for locally Lipschitz functionals. We use the Mountain-Pass theorem due to Chang (1981).
Halidias Nikolaos
doaj   +1 more source

Near‐Surface Maximum Wind Speed Prediction Using XGBoost Model Integrated Bayesian Optimization Algorithm and Based on K‐Nearest Neighbor Mutual Information Feature Selection

open access: yesMeteorological Applications, Volume 33, Issue 3, May/June 2026.
Integrating Bayesian optimization and intelligent feature selection with XGBoost, this model drastically improves maximum wind speed prediction accuracy by 19%–66%. It delivers reliable forecasts for wind energy planning and typhoon risk management.
Xiaoyan Huang   +4 more
wiley   +1 more source

Multiple solutions for Schrodinger-Maxwell systems with unbounded and decaying radial potentials

open access: yesElectronic Journal of Differential Equations, 2014
This article concerns the nonlinear Schrodinger-Maxwell system $$\displaylines{ -\Delta u +V(|x|)u +Q(|x|)\phi u=Q(|x|) f(u),\quad \hbox{in } \mathbb{R}^3\cr -\Delta \phi =Q(|x|) u^{2}, \quad \hbox{in } \mathbb{R}^3 }$$ where V and Q are unbounded ...
Fangfang Liao   +2 more
doaj  

Detecting Thunderstorm‐Related High‐Energy Phenomena in Weak Signals

open access: yesJournal of Geophysical Research: Atmospheres, Volume 131, Issue 8, 28 April 2026.
Abstract Gamma‐ray glows (GRGs) are high‐energy events associated with thunderstorms, characterized by an enhancement of the high‐energy background radiation lasting from a few seconds to several minutes. They are typically detected near their sources by balloons, aircraft, mountain‐based observatories, or at sea level in regions where thunderstorms ...
Y. Hazem   +3 more
wiley   +1 more source

Multiplicity of solutions for non-homogeneous Neumann problems in Orlicz-Sobolev spaces

open access: yesElectronic Journal of Differential Equations, 2017
This article concerns the existence of non-trivial weak solutions for a class of non-homogeneous Neumann problems. The approach is through variational methods and critical point theory in Orlicz-Sobolev spaces.
Shapour Heidarkhani   +4 more
doaj  

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