Results 41 to 50 of about 992,003 (291)

Nonzero positive solutions of a multi-parameter elliptic system with functional BCs

, 2017
We prove, by topological methods, new results on the existence of nonzero positive weak solutions for a class of multi-parameter second order elliptic systems subject to functional boundary conditions. The setting is fairly general and covers the case of
Infante, Gennaro
core   +1 more source

Higher order multi-point fractional boundary value problems with integral boundary conditions

, 2018
In this paper, we concerned with positive solutions for higher order m-point nonlinear fractional boundary value problems with integral boundary conditions. We establish the criteria for the existence of at least one, two and three positive solutions for higher order m-point nonlinear fractional boundary value problems with integral boundary conditions
Yaslan, İsmail, Günendi, M.
openaire   +4 more sources

Existence results for multi-term fractional differential equations with nonlocal multi-point and multi-strip boundary conditions

Advances in Difference Equations, 2018
In this paper, we discuss the existence and uniqueness of solutions for a new class of multi-point and multi-strip boundary value problems of multi-term fractional differential equations by using standard fixed point theorems.
Ravi P. Agarwal, Ahmed Alsaedi, Najla Alghamdi, Sotiris K. Ntouyas, Bashir Ahmad   +4 more
doaj   +1 more source

The Casimir effect as scattering problem [PDF]

, 2007
We show that Casimir-force calculations for a finite number of non-overlapping obstacles can be mapped onto quantum-mechanical billiard-type problems which are characterized by the scattering of a fictitious point particle off the very same obstacles ...
A Wirzba, Birman M Sh, Bordag M Wirzba A, Bulgac A, Casimir H B G, Eckhardt B, Emig T Graham N Jaffe R L Kardar M, Emig T Graham N Jaffe R L Kardar M, Emig T Jaffe R L, Gies H, Gies H, Gutzwiller M C, Hamermesh M, Huang K, Kenneth O Klich I, Krein M G, Krein M G, Mazzitelli F D, Milton K A Wagner J, Wirzba A, Wirzba A   +20 more
core   +2 more sources

A numerical study of the F-model with domain-wall boundaries [PDF]

, 2017
We perform a numerical study of the F-model with domain-wall boundary conditions. Various exact results are known for this particular case of the six-vertex model, including closed expressions for the partition function for any system size as well as its
Keesman, Rick, Lamers, Jules
core   +5 more sources

Existence of positive solutions for multi-point resonance systems of differential equations with boundary value conditions

Journal of Hebei University of Science and Technology, 2016
It is difficult to study the existence of solutions for boundary value problems of differential equations at resonance, moreover, to get positive solutions of boundary value problems for differential equations at resonance is more difficult.
Weihua JIANG, Caixia YANG
doaj   +1 more source

Inequalities of Green’s functions and positive solutions to nonlocal boundary value problems

Journal of Inequalities and Applications, 2020
In this paper, we discuss the positive solutions of beam equations with the nonlinearities including the slope and bending moment under nonlocal boundary conditions involving Stieltjes integrals.
Shijie Fan, Pengxu Wen, Guowei Zhang
doaj   +1 more source

On the (k,φ)-Hilfer Langevin fractional coupled system having multi point boundary conditions and fractional integrals

Ain Shams Engineering Journal
In this manuscript, we investigate the (k,φ)-Hilfer Langevin fractional coupled system having multi point boundary conditions and fractional integrals.
Nana Pan, Naila, Akbar Zada, Ioan-Lucian Popa, Fairouz Tchier   +4 more
doaj   +1 more source

Spin dependent point potentials in one and three dimensions

, 2006
We consider a system realized with one spinless quantum particle and an array of $N$ spins 1/2 in dimension one and three. We characterize all the Hamiltonians obtained as point perturbations of an assigned free dynamics in terms of some ``generalized ...
Adami R, Akhiezer N, Albeverio S, Albeverio S, Albeverio S, Avdonin S A, Berezin F A, Bethe H, Cacciapuoti C, Claudio Cacciapuoti, Fermi E, Fermi E, Gorbachuk V I, Hepp K, Kronig R de L, Lovesey S W, Minlos R A, Minlos R A, Mott N F, Pankrashkin K, Raffaele Carlone, Reed M, Reed M, Rodolfo Figari   +23 more
core   +1 more source

Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM

FEBS Letters, EarlyView.
Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley   +1 more source