Results 91 to 100 of about 850,462 (296)

Ground-state periodic traveling waves for Fermi-Pasta-Ulam-type systems on a two-dimensional lattice

Researches in Mathematics
The paper is devoted to the Fermi-Pasta-Ulam-type system describing an infinite system of nonlinearly coupled particles on a two-dimensional integer-valued lattice. Each particle is assumed to interact nonlinearly with its four nearest neighbors.
S.M. Bak, H.M. Kovtoniuk
doaj   +1 more source

Note on an anisotropic p-Laplacian equation in $R^n$

Electronic Journal of Qualitative Theory of Differential Equations, 2010
In this paper, we study a kind of anisotropic p-Laplacian equations in $R^n$. Nontrivial solutions are obtained using mountain pass theorem given by Ambrosetti-Rabinowitz.
S. El Manouni
doaj   +1 more source

Mountain Pass on a Closed Convex Set

Journal of Mathematical Analysis and Applications, 1997
The author proves a version of the mountain pass theorem for a functional defined on a closed convex set of a Banach space. Such a functional does not necessarily satisfy the Palais-Smale condition. This abstract result is applied to the study of the semilinear Dirichlet problem \[ \begin{cases} -\Delta u+u^2 =f(x) \quad & \text{in } \Omega,\\ u=0 ...
openaire   +2 more sources

Knowledge gaps and research directions in migration ecology for advancing the conservation of migratory songbirds

Biological Reviews, EarlyView.
ABSTRACT Understanding migration ecology is essential for effective conservation of migratory species. To achieve a comprehensive understanding of the ecology of migrating species, it is necessary to study how species react to the complex interplay of intrinsic and extrinsic conditions when optimizing their migratory journey in terms of survival ...
Daniel A. F. Bloche, Heiko Schmaljohann, Nir Sapir   +2 more
wiley   +1 more source

Resolving the biome debate: ecological and palaeo‐data concur that the extensive tree‐limited grassy biomes of central and north‐western Madagascar are largely anthropogenic

Biological Reviews, EarlyView.
ABSTRACT For millennia, human activities have transformed ecosystems globally. Determining which landscapes are predominantly anthropogenic is crucial to conservation and habitat restoration. Madagascar, a critically‐threatened biodiversity hotspot, is a prominent example.
Grant S. Joseph, Sean Hixon, Colleen L. Seymour, Laurie R. Godfrey, Miguel Pedrono, Karen E. Samonds, Andrinajoro R. Rakotoarivelo, Brooke E. Crowley   +7 more
wiley   +1 more source

Ground-state solutions of a Hartree–Fock type system involving critical Sobolev exponent

Electronic Journal of Qualitative Theory of Differential Equations
In this paper, ground-state solutions to a Hartree–Fock type system with a critical growth are studied. Firstly, instead of establishing the local Palais–Smale (P.-S.) condition and estimating the mountain-pass critical level, a perturbation method is ...
Xiaoli Zhu, Zushun Min
doaj   +1 more source

Existence of solutions for a class of quasilinear degenerate $p(x)$-Laplace equations

Electronic Journal of Qualitative Theory of Differential Equations, 2018
We study the existence of weak solutions for a degenerate $p(x)$-Laplace equation. The main tool used is the variational method, more precisely, the Mountain Pass Theorem.
Qing-Mei Zhou, Jian-Fang Wu
doaj   +1 more source

Pakistan, Khyber Pass from mountain top in Peshawar

, 1934
View from ridge looking down into Khyber Pass.Khyber Pass (Khaybar or Khaibar Pass) is the narrow mountain pass between Afghanistan and Pakistan connecting Kabul with Peshawar.Khyber Pass. (2012). In Encyclopædia Britannica.
Sorensen, Clarence Woodrow, 1907-1982; Harris, Eugene V., 1913-1978
core  

When Nature Counts: Corporate Biodiversity Attention and Access to Bank Finance

Business Strategy and the Environment, EarlyView.
ABSTRACT This paper investigates whether corporate attention to biodiversity influences firms' access to bank loans, an overlooked question in the emerging biodiversity–finance literature. Using a novel, text‐based measure constructed from 446 biodiversity‐related keywords and applied to Chinese A‐share listed firms from 2000 to 2023, we show that ...
Ruxiao Li, Bo Zhang, Zhang‐Hangjian Chen, Hafiz Hoque   +3 more
wiley   +1 more source

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

Electronic 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, Xiaoping Wang, Zhigang Liu   +2 more
doaj