Results 131 to 140 of about 9,235 (294)
Laser &Photonics Reviews, EarlyView.Van der Waals ferroelectric NbOX2 thin films exhibit phonon‐resonance enhanced electro‐optic responses, 332 pm/V at 3.1 THz (NbOI2) and 192 pm/V at 3.7 THz (NbOBr2), the highest among vdW materials, and show 4% non‐resonant SHG modulation together with resonant phonon‐enhancement under a 150 kV/cm THz pump.
Baolong Zhang +3 more
wiley +1 more source
Stabilizing a nonlinear system by using feedback control [PDF]
, 2010 This dissertation considers how to stabilize a nonlinear system by using feedback control. To stabilize a nonlinear system, we first need to find the unstable steady state.
Kareem, Rasaq
core
Influence of Strain Rate on the Strain Hardening Behavior of a Lean Duplex Stainless Steel
MetalMat, EarlyView.The aim of this study was to examine how strain rate influences the compressive strain‐hardening behavior of a lean duplex stainless steel LDX 2101. Microstructural analysis using electron backscatter diffraction (EBSD) revealed a strain‐induced austenite‐to‐martensite transformation.
Akilakps Sawyerr +4 more
wiley +1 more source
On uniform and decay estimates for unbounded solutions of partial differential equations
, 2015 We prove that if a function $u$ satisfies certain integral estimates (of energy type) then it verifies estimates of the type $$ \|u(t)\|_{L^r(\Omega)} \leq c \frac{\|u(0)\|^{\gamma_0}_{L^{r_0}(\Omega)}}{t^{\gamma_1}}, \qquad t > 0, $$ where $r$ and $
PORZIO, Maria Michaela
core +1 more source
Numerical Investigation of a Diffusive SIR Model: Focus on Positivity Preservation
Mathematical Methods in the Applied Sciences, EarlyView.ABSTRACT In this paper, we consider a system of semilinear partial differential equations (PDEs) representing a spatially extended SIR epidemic model. A brief analytical investigation of the well‐posedness and positivity of the solutions is provided in the appendix, while the main focus is on the numerical treatment of the model.
Rahele Mosleh +2 more
wiley +1 more source
Journal of Optimization, Differential Equations and Their ApplicationsA nonlinear boundary value problem is considered for a system of parabolic equations in an inhomogeneous region, that requires conjugation conditions.
Olha R. Michuta +3 more
doaj +1 more source
On the viscosity solutions of a stochastic differential utility problem [PDF]
We prove existence, uniqueness and gradient estimates of stochastic differential utility as a solution of the Cauchy problem for degenerate nonlinear partial differential equation.
Andrea Pascucci, Fabio Antonelli
core
On Compressible Fluid Flows of Forchheimer‐Type in Rotating Heterogeneous Porous Media
Mathematical Methods in the Applied Sciences, EarlyView.ABSTRACT We study the dynamics of compressible fluids in rotating heterogeneous porous media. The fluid flow is of Forchheimer‐type and is subject to a mixed mass and volumetric flux boundary condition. The governing equations are reduced to a nonlinear partial differential equation for the pseudo‐pressure.
Emine Celik, Luan Hoang, Thinh Kieu
wiley +1 more source
Necessary conditions for control of objects with distributed constants
Sistemnì Doslìdženâ ta Informacìjnì Tehnologìï, 2019 Problems of optimal control over objects with distributed constants described by nonlinear differential equations with partial derivatives of elliptic, parabolic and hyperbolic types have been considered.
G. Iovane, V. M. Mizernyy
doaj
Nordgren PINNs to VQE: Advancing Hydraulic Fracturing Simulations in Shale Reservoirs
International Journal for Numerical and Analytical Methods in Geomechanics, EarlyView.ABSTRACT This study advances hydraulic fracturing simulations in shale reservoirs using two computational paradigms, Physics‐Informed Neural Networks (PINNs) and the Variational Quantum Eigensolver (VQE). PINNs were employed to solve Nordgren's equation, which governs fracture width evolution, by embedding physical laws into the neural network ...
Dennis Delali Kwesi Wayo +7 more
wiley +1 more source