Optimal Design of the Time-Dependent Support of Bang–Bang Type Controls for the Approximate Controllability of the Heat Equation

2013 ◽  
Vol 161 (3) ◽  
pp. 951-968 ◽  
Author(s):  
Francisco Periago
Keyword(s):  
Optimal Design ◽  
Heat Equation ◽  
Approximate Controllability ◽  
Time Dependent

scholarly journals hp-FEM for the fractional heat equation

2020 ◽  
Author(s):  
Jens Markus Melenk ◽  
Alexander Rieder
Keyword(s):  
Finite Elements ◽  
Heat Equation ◽  
Exponential Convergence ◽  
Time Dependent ◽  
Nonlocal Operator ◽  
Time Stepping ◽  
Fractional Heat Equation ◽  
Time Dependent Problem ◽  
Hp Finite Elements ◽  
Abstract Framework

Abstract We consider a time-dependent problem generated by a nonlocal operator in space. Applying for the spatial discretization a scheme based on $hp$-finite elements and a Caffarelli–Silvestre extension we obtain a semidiscrete semigroup. The discretization in time is carried out by using $hp$-discontinuous Galerkin based time stepping. We prove exponential convergence for such a method in an abstract framework for the discretization in the spatial domain $\varOmega $.

scholarly journals Controllability of the Semilinear Heat Equation with Impulses and Delay on the State

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Hugo Leiva
Keyword(s):  
Continuous Function ◽  
Characteristic Function ◽  
Heat Equation ◽  
Bounded Domain ◽  
Distributed Control ◽  
Approximate Controllability ◽  
Nonempty Subset ◽  
Nonlinear Functions ◽  
Semilinear Heat Equation ◽  
Approximately Controllable

AbstractIn this paper we prove the interior approximate controllability of the following Semilinear Heat Equation with Impulses and Delaywhere Ω is a bounded domain in RN(N ≥ 1), φ : [−r, 0] × Ω → ℝ is a continuous function, ! is an open nonempty subset of Ω, 1ω denotes the characteristic function of the set ! and the distributed control u be- longs to L2([0, τ]; L2(Ω; )). Here r ≥ 0 is the delay and the nonlinear functions f , Ik : [0, τ] × ℝ × ℝ → ℝ are smooth enough, such thatUnder this condition we prove the following statement: For all open nonempty subset ! of Ω the system is approximately controllable on [0, τ], for all τ > 0.

scholarly journals On the parabolic potentials in degenerate-type heat equation

1991 ◽  
Vol 4 (2) ◽  
pp. 147-160 ◽  
Author(s):  
Igor Malyshev
Keyword(s):  
Heat Equation ◽  
Mixed Type ◽  
Time Dependent ◽  
Degenerate Type ◽  
Theory Technique

Using distributions theory technique we introduce parabolic potentials for the heat equation with one time-dependent coefficient (not everywhere positive and continuous) at the highest space-derivative, discuss their properties, and apply obtained results to three illustrative problems. Presented technique allows to deal with some equation of the degenerate/mixed type.

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