Results 251 to 260 of about 327,898 (294)
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Upper and lower solutions for periodic problems
Applied Mathematics and Computation, 2003zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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SHARP UPPER AND LOWER SOLUTIONS IN SOME PARABOLIC PROBLEMS
Numerical Functional Analysis and Optimization, 2002 ABSTRACT In this paper we construct upper and lower solutions for a class of parabolic initial-boundary value problems in terms of the solution of the St-Venant problem and first eigenvalue problem. These bounds are sharp in the sense that they coincide with the exact solution in particular situations.
MARRAS, MONICA, PIRO, STELLA
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Boundary value problems involving upper and lower solutions in reverse order
Journal of Computational and Applied Mathematics, 2009 In this paper, we discuss the existence of extreme solutions of the boundary value problem for a class of first-order functional equations with a nonlinear boundary condition.
Weibing Wang, Xuxin Yang
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Upper and Lower Critical Solution Temperatures in Polystyrene Solutions. II
Macromolecules, 1973Abstract Upper and lower critical solution temperatures have been determined for solutions of polyethylene in n-butyl acetate and n-amyl acetate over the molecular weight range of M η = 1·36 × 10 4 to 17·5 × 10 4 . Polyethylene solution in n-butyl acetate displays a smaller miscibility region than that of the polyethylene/n-amyl acetate system,
N. Kuwahara +3 more
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Remarks on variational methods and lower-upper solutions
NoDEA : Nonlinear Differential Equations and Applications, 1999The authors consider the following class of equations \[ \begin{cases} -\Delta u(x)= f\bigl(x,u(x) \bigr),\quad x\in\Omega,\\ u=0\text{ on }\partial \Omega,\end{cases} \tag{1} \] where \(\Omega\subset\mathbb{R}^N\) is a bounded smooth domain. Letting \(F(x,t)=\int^t_0 f(x,s)ds\), the energy functional associated to (1) is defined by the formula \[ J(u)=
CONTI, MONICA, MERIZZI L, TERRACINI S.
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Nonlinear Analysis: Real World Applications, 2012 We develop a lower and upper solutions method for the periodic problem associated with the capillarity equation \begin{equation*} -\Big( u'/{ \sqrt{1+{u'}^2}}\Big)' = f(t,u) \end{equation*} in the space of bounded variation functions.
Franco Obersnel, Pierpaolo Omari
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Upper and lower bounds for the solutions of Markov renewal equations
Mathematical Methods of Operations Research, 2005zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Gang Li, Jiaowan Luo
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On the Construction of Upper and Lower Solutions by the Nagumo Method
Differential Equations, 2004The author considers the Dirichlet boundary value problem \[ y''=f(x,y,y'),\quad x\in(a,b),\; y(a)=y_0,\quad y(b)=y_1. \] Provided that the partial derivatives \(f_y\) and \(f_{y'}\) are continuous on a suitable set, the existence of at least one solution lying between a pair of well-ordered lower and upper solutions is proved.
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Positive Solutions of the Fractional Relaxation Equation Using Lower and Upper Solutions
Vietnam Journal of Mathematics, 2016zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Chidouh, Amar +2 more
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Lower and upper critical solution temperatures of binary polymeric solutions
Fluid Phase Equilibria, 2016Abstract The phase behavior of binary polymeric solutions such as lower and upper critical solution temperatures has an important role in many polymeric processes. For theoretical investigation on the prediction of these temperatures, a substantial number of data points on binary polymeric solutions were collected from literature and used to present ...
Ayoub Ejraei +4 more
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