Results 131 to 140 of about 12,177,110 (235)

A nonlocal boundary value problem with singularities in phase variables

open access: yesMathematical and Computer Modelling, 2004
Sufficient conditions for the solvability are obtained for the second-order nonlinear boundary value problem \[ (g(x'(t)))'=f(t,x(t)),\;x'(t)),\quad x(0)=x(T)=-\gamma\min\{x(t): t\in[0,T]\}. \] Here, \(g\) is a continuous increasing odd function. The right-hand side \(f(t,x,x')>0\) may be singular both at \(x=0\) and \(x'=0\).
openaire   +1 more source

Ultra‐Weak Photon Emission as a By‐Product of Mitochondrial Oxidative Metabolism: Mechanisms, Limits, and Implications

open access: yesNanophotonics, Volume 15, Issue 20, 27 October 2026.
Mitochondrial oxidative metabolism generates ROS. Downstream chemiexcitation triplet carbonyls, singlet oxygen; produces ultra‐weak photon emission (UPE). Energetic bounds restrict well‐coupled respiration to extremely weak, red/NIR‐biased emission. Stronger visible UPE indicates elevated oxidative flux, linking measured photon counts to redox state ...
Samuel Crowther   +2 more
wiley   +1 more source

Geometry‐Based Neural‐Network Prediction of Electron Localization Function Topology in Dense Hydrogen

open access: yesChemistry – A European Journal, Volume 32, Issue 39, 22 October 2026.
We present a machine‐learning framework that predicts the electron localization function (ELF) of dense hydrogen directly from atomic geometry, bypassing explicit electronic‐structure calculations. Trained on ab initio data for fluid hydrogen across multiple pressures, the model achieves high accuracy and reveals pressure‐dependent nonlocal ...
Xiaoyu Wang   +5 more
wiley   +1 more source

A Practical Guide to First‐Principles Calculations for Pseudocapacitive Materials: From Electrochemical Experiments to Atomistic Understanding

open access: yesChemElectroChem, Volume 13, Issue 20, 16 October 2026.
Electrochemical experiments reveal what happens, whereas first principles calculations explain why. Emerging computational electrochemistry is bridging these perspectives, enabling quantitative understanding of electrode/electrolyte interfaces and enabling the rational design of next‐generation energy storage materials.
Kenji Oqmhula, Ryo Maezono, Kenta Hongo
wiley   +1 more source

Young measures in a nonlocal phase transition problem [PDF]

open access: yes, 1997
A nonlocal variational problem modelling phase transitions is studied in the framework of Young measures. The existence of global minimisers among functions with internal layers on an infinite tube is proved by combining a weak convergence result ...
Winter, M, Ren, X
core  

Nonlocal problem with the third boundary-value condition for a model of parabolic-hyperbolic type equation [PDF]

open access: yes, 2019
In the article a nonlocal problem for a model of the parabolic hyberbolic type equation is studied. The third boundary-value condition in the parabolic part of the domain and shifting condition is given in the hyberbolic part of the domain.
SOTVOLDIEV, А, URINOV,, A. A.
core  

On Existence of Solution of a Nonlocal Boundary Value Problem for Heat Transfer Equation

open access: yes, 2009
In this work, it is considered non-homegenous heat equation with nonlocal boundary conditions. Non-local boundary conditions are reduced to pointwise non classical boundary value problem.
Mamedov, Khamlar
core   +1 more source

K-dimensional nonlocal boundary-value problems at resonance

open access: yesElectronic Journal of Differential Equations, 2015
Summary: We show the existence of at least one solution to the system of nonlocal resonant boundary-value problem \[ x''= f(t,x),\quad x'(0)= 0,\quad x'(1)= \int^1_0 x'(s)\,dg(s), \] where \(f: [0,1]\times\mathbb{R}^k\to \mathbb{R}^k\), \(g: [0,1]\to \mathbb{R}^k\).
openaire   +2 more sources

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