Results 61 to 70 of about 369,472 (255)
Theory of Supercritical Coupling and Generalized Bound States in the Continuum
Laser &Photonics Reviews, EarlyView.We develop a general theory of supercritical coupling and generalized bound states in the continuum (gBICs), revealing how interference between radiative and absorptive channels enables quality factors beyond conventional material‐loss limits. The framework unifies non‐Hermitian mode coupling, causality‐driven reactive interactions, and interference ...
Sergio Balestrieri +3 more
wiley +1 more source
Multiplicity of solutions for gradient systems
Electronic Journal of Differential Equations, 2010 We establish the existence of nontrivial solutions for an elliptic system which is resonant both at the origin and at infinity. The resonance is given by an eigenvalue problem with indefinite weight, and the nonlinear term is permitted to be unbounded.
Edcarlos D. Da Silva
doaj
Singular Sturm?Liouville problems with nonnegative and indefinite weights
Monatshefte f�r Mathematik, 1984 This article is concerned with the oscillatory properties of the eigenfunctions of a class of singular Sturm-Liouville problems \(- (py')'+qy=\lambda wy\) on (a,b), where the weight function w vanishes on a subinterval of positive measure, or where the weight function w changes sign on (a,b).
Kaper, H.G., Kwong, M.K., Zettl, A.
openaire +2 more sources
Polymer International, EarlyView.An overview and categorization of man‐made per‐ or polyfluoroalkyl substances (PFASs) including low‐molar‐mass and high‐molar‐mass fluorochemicals, and their international regulations is presented. Though certain PFASs are toxic, bioaccumulative and cross the human cellular membranes, others, such as fluoropolymers, are safe, reliable and involved in ...
Bruno Améduri
wiley +1 more source
Steklov problem with an indefinite weight for the \(p\)-Laplacian
Electronic Journal of Differential Equations, 2005 info:eu-repo/semantics ...
openaire +4 more sources
Optimal Homogeneous ℒp$$ {\boldsymbol{\mathcal{L}}}_{\boldsymbol{p}} $$‐Gain Controller
International Journal of Robust and Nonlinear Control, EarlyView.ABSTRACT Nonlinear ℋ∞$$ {\mathscr{H}}_{\infty } $$‐controllers are designed for arbitrarily weighted, continuous homogeneous systems with a focus on systems affine in the control input. Based on the homogeneous ℒp$$ {\mathcal{L}}_p $$‐norm, the input–output behavior is quantified in terms of the homogeneous ℒp$$ {\mathcal{L}}_p $$‐gain as a ...
Daipeng Zhang +3 more
wiley +1 more source
Economic Anthropology, EarlyView.ABSTRACT In the Chinese kimchi industry, manufacturers employ product names, photographs, and logistical strategies to promote their kimchi's “Koreanness.” So, what makes their kimchi “Korean,” and how does its Koreanness formulate kimchi's commodity value?
Heangjin Park
wiley +1 more source
Southern Economic Journal, EarlyView.ABSTRACT This paper examines the causal impact of federal homeless‐assistance grants on reported homelessness and shelter capacity across 370 Continuums of Care in 2019. We exploit cross‐sectional variation in pre‐1940 housing shares, used in Community Development Block Grant formula allocations, as an instrument for combined CoC and Emergency ...
Luke Maddock, Anita Alves Pena
wiley +1 more source
Strongly indefinite systems with critical sobolev exponents and weights
Applied Mathematics Letters, 2004 Let \(\Omega\) be a bounded smooth domain in \(\mathbb R^N\), \(N\geq 4\) and \(\lambda,\mu\in\mathbb R\). The author deals with the following problem: \[ -\Delta v=\lambda u+K(x)|u|^{p-1}u\text{ in }\Omega, \quad -\Delta u=\mu v+ Q(x)|v|^{q-1}v\text{ in }\Omega, \quad u=v=0\text{ on }\partial\Omega, \tag{1} \] where \(p,q>1\) and coefficients \(K,Q ...
openaire +1 more source