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TOP 10 Most Read Articles in DCDSS, July 2016
1 
Positivity for the Navier bilaplace, an antieigenvalue and an expected lifetime
Volume 7, Number 4, Pages: 839  855, 2014
Guido Sweers
Abstract
References
Full Text
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We address the question, for which $\lambda \in \mathbb{R}$ is the boundary
value problem
\begin{equation*}
\left\{
\begin{array}{cc}
\Delta ^{2}u+\lambda u=f & \text{in }\Omega , \\
u=\Delta u=0 & \text{on }\partial \Omega ,
\end{array}
\right.
\end{equation*}
positivity preserving, that is, $f\geq 0$ implies $u\geq 0$. Moreover, we consider what
happens, when $\lambda $ passes the maximal value for which positivity is
preserved.

2 
On two phase free
boundary problems governed by elliptic equations with distributed sources
Volume 7, Number 4, Pages: 673  693, 2014
Daniela De Silva,
Fausto Ferrari
and Sandro Salsa
Abstract
References
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We present some recent progress on the analysis of twophase free boundary
problems governed by elliptic operators, with nonzero right hand side. We
also discuss on several open questions, object of future investigations.

3 
A framework for the development of implicit solvers for incompressible flow problems
Volume 5, Number 6, Pages: 1195  1221, 2012
David J. Silvester,
Alex Bespalov
and Catherine E. Powell
Abstract
References
Full Text
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This survey paper reviews some recent developments in the design of
robust solution methods for the NavierStokes equations
modelling incompressible fluid flow. There are two
building blocks in our solution strategy. First, an implicit time integrator that uses
a stabilized trapezoid rule with an explicit
AdamsBashforth method for error control, and second, a
robust Krylov subspace solver for the spatially discretized system.
Numerical experiments are presented that illustrate the effectiveness
of our generic approach. It is further shown that the basic solution strategy can be
readily extended to more complicated models, including
unsteady flow problems with coupled physics and steady flow problems that
are nondeterministic in the sense that they have uncertain input data.

4 
Recent progress in the theory of nonlinear diffusion with fractional Laplacian operators
Volume 7, Number 4, Pages: 857  885, 2014
JuanLuis Vázquez
Abstract
References
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We report on recent progress in the study of nonlinear diffusion equations involving nonlocal, longrange diffusion effects. Our main concern is the socalled fractional porous medium equation, $\partial_t u +(\Delta)^{s}(u^m)=0$, and some of its generalizations. Contrary to usual porous medium flows, the fractional version has infinite speed of propagation for all exponents $0 < s < 1$ and $m > 0$; on the other hand, it also generates an $L^1$contraction semigroup which depends continuously on the exponent of fractional differentiation and the exponent of the nonlinearity.
After establishing the general existence and uniqueness theory, the main properties are described: positivity, regularity, continuous dependence, a priori estimates, Schwarz symmetrization, among others. Selfsimilar solutions are constructed (fractional Barenblatt solutions) and they explain the asymptotic behaviour of a large class of solutions. In the fast diffusion range we study extinction in finite time and we find suitable special solutions. We discuss KPP type propagation. We also examine some related equations that extend the model and briefly comment on current work.

5 
Some degenerate parabolic problems: Existence and decay properties
Volume 7, Number 4, Pages: 617  629, 2014
Lucio Boccardo
and Maria Michaela Porzio
Abstract
References
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We study the existence of solutions $u $ belonging to $L^1(0,T; W_0^{1,1}(\Omega)) \cap L^{\infty}(0,T;L^2(\Omega))$ of a class of nonlinear problems whose prototype is the following
\begin{equation} \label{prob1}
\left\{
\begin{array}{lll}
\displaystyle
u_t  {\rm div} \left( \frac{\nabla u}{(1+u)^2} \right) = 0, & \hbox{in} & \Omega_T; \\
u=0, & \hbox{on} & \partial\Omega \times (0,T); & & & & \hbox{(1)}\\
u(x,0)= u_0(x) \in L^2(\Omega), & \hbox{ in} & \Omega.
\end{array}
\right.
\end{equation}
We investigate also the asymptotic estimates satisfied by distributional solutions that we find and the uniqueness.

6 
Oscillations in suspension bridges, vertical and torsional
Volume 7, Number 4, Pages: 785  791, 2014
P. J. McKenna
Abstract
References
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We first review some history prior to the failure of the Tacoma Narrows suspension bridge.
Then we consider some popular accounts of this in the popular physics literature, and the scientific
and scholarly basis for these accounts and point out some failings. Later, we give a quick introduction
to three different models, one single particle, one a continuum model, and two systems with two degrees of freedom.

7 
Efficient robust control of first order scalar conservation laws using semianalytical solutions
Volume 7, Number 3, Pages: 525  542, 2014
Yanning Li,
Edward Canepa
and Christian Claudel
Abstract
References
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This article presents a new robust control framework for transportation problems in which the state is modeled by a first order scalar conservation law. Using an equivalent formulation based on a HamiltonJacobi equation, we pose the problem of controlling the state of the system on a network link, using initial density control and boundary flow control, as a Linear Program. We then show that this framework can be extended to arbitrary control problems involving the control of subsets of the initial and boundary conditions. Unlike many previously investigated transportation control schemes, this method yields a globally optimal solution and is capable of handling shocks (i.e. discontinuities in the state of the system). We also demonstrate that the same framework can handle robust control problems, in which the uncontrollable components of the initial and boundary conditions are encoded in intervals on the right hand side of inequalities in the linear program. The lower bound of the interval which defines the smallest feasible solution set is used to solve the robust LP/MILP. Since this framework leverages the intrinsic properties of the HamiltonJacobi equation used to model the state of the system, it is extremely fast. Several examples are given to demonstrate the performance of the robust control solution and the tradeoff between the robustness and the optimality.

8 
Global solutions for a nonlinear integral equation with a generalized heat kernel
Volume 7, Number 4, Pages: 767  783, 2014
Kazuhiro Ishige,
Tatsuki Kawakami
and Kanako Kobayashi
Abstract
References
Full Text
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We study
the existence and the large time behavior of globalintime solutions of a nonlinear integral equation with a generalized heat kernel
\begin{eqnarray*}
& & u(x,t)=\int_{{\mathbb R}^N}G(xy,t)\varphi(y)dy\\
& & \qquad\quad
+\int_0^t\int_{{\mathbb R}^N}G(xy,ts)F(y,s,u(y,s),\dots,\nabla^\ell u(y,s))dyds,
\end{eqnarray*}
where $\varphi\in W^{\ell,\infty}({\mathbb R}^N)$ and $\ell\in\{0,1,\dots\}$.
The arguments of this paper are applicable to
the Cauchy problem for various nonlinear parabolic equations
such as fractional semilinear parabolic equations, higher order semilinear parabolic equations
and viscous HamiltonJacobi equations.

9 
Hopf fibration and singularly perturbed elliptic equations
Volume 7, Number 4, Pages: 823  838, 2014
Bernhard Ruf
and P. N. Srikanth
Abstract
References
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In this article we show how the Hopf fibration can be used to generate special solutions of singularly perturbed elliptic equations on annuli. Indeed, by the Hopf fibration the equation can be reduced to a lower dimensional problem, to which known results on single (or multiple point) concentration can be applied. Reversing the reduction process, one obtains solutions concentrating on circles and spheres, which are given as the fibres of the Hopf fibration.

10 
On an initial value problem modeling evolution and selection in living systems
Volume 7, Number 4, Pages: 807  821, 2014
Patrizia Pucci
and Maria Cesarina Salvatori
Abstract
References
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This paper is devoted to the qualitative analysis of a new broad class of nonlinear initial value problems that model evolution and selection in living systems derived by the mathematical tools of the kinetic theory of active particles. The paper is divided into two parts. The first shows how to obtain the nonlinear equations with proliferative/distructive nonlinear terms. The latter presents a detailed analysis of the related initial value problem. In particular, it is proved that the corresponding initial value problem admits a unique nonnegative maximal solution. However, the solution cannot be in general global in time, due to the possibility of blowup. The blowup occurs when the biological life system is globally proliferative, see Theorem 3.3.

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