R. Pinnau

Notes on Lipschitz estimates for the stop and play operator in plasticity (2009)

Lang, H., Dressler, K., Pinnau, R., Speckert, M.

We present a generalisation of existing Lipschitz estimates for the stop and play operator for an arbitrary convex and closed characteristic, which contains the origin, in a separable Hilbert space....

Initial temperature reconstruction for nonlinear heat equation: Application to a coupled radiative-conductive heat transfer problem (2008)

Pereverzyev, S.S., Pinnau, R., Siedow, N.

In a cooling process described by a nonlinear heat equation, we are interested to recover the initial temperature from the temperature measurements that are available on a part of the boundary for...

Adjoint based optimal control using mesh-less discretizations (2008)

Marburger, J., Marheineke, N., Pinnau, R.

Adjoint based optimal control using mesh-less discretizations (2008)

Marburger, J., Marheineke, N., Pinnau, R.

Regularized fixed-point iterations for nonlinear inverse problems (2006)

Pereverzyev, S.S., Pinnau, R., Siedow, N.

In this paper, we introduce a derivative-free, iterative method for solving nonlinear ill-posed problems Fu = y, where instead of y, noisy data y(delta) with parallel to y - y(delta)parallel to Y is...

Lipschitz estimates for the stop and the play operator (2006)

Lang, H., Dreßler, K., Pinnau, R.

Error estimates for quasistatic global elastic correction and linear kinematic hardening material (2006)

Lang, H., Dreßler, K., Pinnau, R., Speckert, M.

A homotopy between the solutions of the elastic and elastoplastic boundary value problem (2006)

Lang, H., Dreßler, K., Pinnau, R., Bitsch, G.

Regularized Fixed-Point Iterations for Nonlinear Inverse Problems (2005)

Pereverzyev, S.S., Pinnau, R., Siedow, N.

In this paper we introduce a derivative-free, iterative method for solving nonlinear ill-posed problems $Fx=y$, where instead of $y$ noisy data $y_delta$ with $| y-y_delta |leqdelta$ are given and...

Numerical solvers for radiation and conduction in high temperature gas flows (2005)

Seaid, M., Klar, A., Pinnau, R.

Initial temperature reconstruction for a nonlinear heat equation: Application to radiative heat transfer (2005)

Pereverzyev, S., Pinnau, R., Siedow, N.

Regularized Fixed-Point Iterations for Nonlinear Inverse Problems (2005)

S. S. Pereverzyev, R. Pinnau, N. Siedow, Fachbereich Mathematik

In this paper we introduce a derivative-free, iterative method for solving nonlinear illposed problems F x = y, where instead of y noisy data yδ with �y − yδ � ≤ δ are given and F: D(F)...

The Stationary Current-Voltage Characteristics of the Quantum Drift Diffusion Model (2000)

R. Pinnau, A. Unterreiter

This paper is concerned with numerical algorithms for the bipolar quantum drift diffusion model. For the thermal equilibrium case a quasi-gradient method minimizing the energy functional is...