Results 71 to 80 of about 57,321 (196)

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

Difference approximations for singular perturbations of systems of ordinary differential equations

Numerische Mathematik, 1974
We consider difference methods for the solution of singular perturbations of boundary value problems.
KREISS, H.O., KELLER, H.B., Abrahamsson, L.R.   +2 more
openaire   +2 more sources

MHD Boundary Layer Flow near Stagnation Point of Linear Stretching Sheet with Variable Thermal Conductivity via He’s Homotopy Perturbation Method

Journal of Applied Fluid Mechanics, 2015
MHD boundary layer flow near stagnation point of linear stretching sheet with variable thermal conductivity are solved using He’s Homotopy Perturbation Method (HPM), which is one of the semi-exact method. Similarity transformation has been used to reduce
JHANKAL KUMAR ANUJ
doaj  

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

Stability criterion for self-similar solutions with a scalar field and those with a stiff fluid in general relativity

, 2003
A stability criterion is derived in general relativity for self-similar solutions with a scalar field and those with a stiff fluid, which is a perfect fluid with the equation of state $P=\rho$.
Brady P, Brady P, Brady P R, Cahill M E, Carr B J, Carr B J, Carr B J, Carr B J, Carr B J, Carr B J, Carr B J, Carr B J, Christodoulou D, Coley A A, Foglizzo T, Frolov A V, Frolov A V, Frolov A V, Goliath M, Goliath M, Gundlach C, Hamadé S H, Harada T, Harada T, Harada T, Harada T, Hawking S W, Hideki Maeda, Koike T, Lin D N C, Madsen M S, Maeda H, Neilsen D W, Neilsen D W, Ori A, Ori A, Ori A, Ori A, Oshiro Y, Roberts M D, Tomohiro Harada, Wainwright J, Wald R M   +42 more
core   +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

Thermal instability in rotating galactic coronae

, 2010
The thermal stability of rotating, stratified, unmagnetized atmospheres is studied by means of linear-perturbation analysis, finding stability, overstability or instability, depending on the properties of the gas distribution, but also on the nature of ...
Balbus, Balbus, Balbus, Balbus, Balbus, Balbus, Balbus, Balbus, Balbus, Bertin, Binney, Binney, Brandenburg, Carlo Nipoti, Chandrasekhar, Cowie, Cowling, Field, Fraternali, Fricke, Fujimoto, Fukugita, Goldreich, Goldreich, Hanawa, Høiland, Kaufmann, Kereš, Knobloch, Lebovitz, Lifschitz, Lin, Lin, Loewenstein, Lynden-Bell, Malagoli, Maller, Marinacci, Mathews, Menou, Nipoti, Nulsen, Papaloizou, Peek, Quataert, Rasmussen, Ryu, Solberg, Sommer-Larsen, Spitzer, Spitzer, Sung, Sung, Sung, Tassoul, Tribble   +55 more
core   +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

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  

Spacetime perspective of gravitational lensing in perturbed cosmologies

Scientific Reports
We develop the spacetime approach to gravitational lensing by spherically symmetric perturbations of flat, cosmological constant-dominated Friedman-Robertson-Walker metrics.
Thomas P. Kling, Sophia MacQueen Pooler
doaj   +1 more source