Results 91 to 100 of about 66,753 (329)

Trace Nickel Activated Biphasic Core‐CuOii/Shell‐CuOi Secondary Microspheres Enable Room Temperature Parts‐Per‐Trillion‐Level NO2 Detection

Advanced Engineering Materials, EarlyView.
An idea of designing novel sensors is proposed by creating appropriate Schottky barriers and vacancies between isomorphous Core‐CuOii/ Shell‐CuOi secondary microspheres and enhancing catalytic and spill‐over effects, and electronegativity via spontaneous biphasic separation, self‐assembly, and trace‐Ni‐doping.
Bala Ismail Adamu, Peipei Chen, Shafia Mukhtar Ibrahim, Mukhtar Lawan Adam, Attia Falak, Mokhotjwa Simon Dhlamini, Hanfu Wang, Lingxiang Jiang, Weiguo Chu   +8 more
wiley   +1 more source

Nonlinear Perturbations and Weak Shock Waves in Isentropic Atmospheres

The Astrophysical Journal
Acoustic perturbations to stellar envelopes can lead to the formation of weak shock waves via nonlinear wave steepening. Close to the stellar surface, the weak shock wave increases in strength and can potentially lead to the expulsion of part of the ...
Tamar Faran, Christopher D. Matzner, Eliot Quataert   +2 more
doaj   +1 more source

A new stochastic compartmental epidemic model driven by a multidimensional stochastic differential equation under a voluntary and imperfect vaccination strategy

Kuwait Journal of Science
This work introduces a novel compartmental epidemic model that integrates both deterministic and stochastic components to capture the dynamics of disease transmission under a voluntary and imperfect vaccination strategy.
Benasquar Mohammed, Aissa Sghir, Dr. Said El Idrissi   +2 more
doaj   +1 more source

Efficient method for solving highly oscillatory ordinary differential equations with applications to physical systems

Physical Review Research, 2020
We present a numerical routine (oscode) with a C++ and Python interface for the efficient solution of one-dimensional, second-order, ordinary differential equations with rapidly oscillating solutions.
F. J. Agocs, W. J. Handley, A. N. Lasenby, M. P. Hobson   +3 more
doaj   +1 more source

Unbounded perturbations of forced second order ordinary differential equations at resonance

Journal of Differential Equations, 1987
In der vorliegenden Arbeit wird die erzwungene nichtlineare gewöhnliche Differentialgleichung der Form ẍ(t)\(+m^ 2x(t)+g(t,x(t)=e(t)\) mit den Bedingungen \(x(0)-x(2\pi)=\dot x(0)-\dot x(2\pi)=0\) betrachtet, wobei \(m\in {\mathbb{Z}}^+\cup \{0\}\), \(e\in L^ 1(0,2\pi)\) und g eine nichtlineare Funktion ist, die die ``Carathéodory-Bedingungen'' erfüllt.
Iannacci, R, Nkashama, M.N
openaire   +2 more sources

Rheocasting versus Die Casting: An Insight into the Low‐Cycle Fatigue Behavior of AlSi7Mg0.6

Advanced Engineering Materials, EarlyView.
The study compares rheocast lightweight components with high‐pressure die cast materials regarding microstructure and fatigue behavior. Rheocast process offers higher efficiency due to lower casting temperatures. Despite some microstructural differences, both processes show similar strengths (yield strength 125 MPa, tensile strength 240 MPa).
Julia Richter, Thomas Wegener, Andreas Schilling, Martin Fehlbier, Thomas Niendorf   +4 more
wiley   +1 more source

Screen‐Printed Flexible Piezoelectric Force Sensor Array with Electromagnetic Interference Shielding

Advanced Engineering Materials, EarlyView.
This article introduces a flexible screen‐printed piezoelectric sensor array designed for low‐frequency healthcare applications such as tactile sensing and cardiovascular monitoring. The device integrates interface electronics enabling the simultaneous acquisition of up to 128 signals, along with flexible EMI shielding that significantly reduces noise ...
Joseph Faudou, Mohammed Benwadih, Arnaud Gabas, Lina Kadura, Minh‐Quyen Le, Daniel Grinberg, Pierre‐Jean Cottinet   +6 more
wiley   +1 more source

Sound wave propagation problems new perturbation methodology

Archives of Acoustics, 2014
The aim of the paper is to present applications of the new algebraic system theory in acoustic problems. Elements of new types of perturbed ordinary and partial differential equations are discussed.
Jerzy Skrzypczyk, A. Winkler-Skalna
doaj  

Model selection in the reconstruction of regulatory networks from time-series data

BMC Research Notes, 2009
Background A widely used approach to reconstruct regulatory networks from time-series data is based on the first-order, linear ordinary differential equations.
Barillot Emmanuel, Novikov Eugene
doaj   +1 more source

Adjoint operators, gauge invariant perturbations, and covariant symplectic structure for black holes in string theory

, 2002
Expressions for the general and complete perturbations in terms of Debye potentials of static charged black holes in string theory, valid for curvature below the Planck scale, are derived starting from a decoupled set of equations and using Wald's method
Cartas-Fuentevilla R., Cartas-Fuentevilla R., Cartas-Fuentevilla R., Cartas-Fuentevilla R., Harms B., Harms B., Harms B., R. Cartas-Fuentevilla   +7 more
core   +1 more source