Bjørn Fredrik Nielsen

Available identifiers

zbMath Open nielsen.bjorn-fredrikMaRDI QIDQ301679

List of research outcomes

Publication	Date of Publication	Type
A Simple Formula for the Generalized Spectrum of Second Order Self-Adjoint Differential Operators	2024-02-15	Paper
Weighted sparsity regularization for source identification for elliptic PDEs	2023-10-30	Paper
Identifying the source term in the potential equation with weighted sparsity regularization	2022-12-08	Paper
Numerical approximation of the spectrum of self-adjoint operators in operator preconditioning	2022-08-10	Paper
Box constraints and weighted sparsity regularization for identifying sources in elliptic PDEs	2022-06-13	Paper
Modified Tikhonov regularization for identifying several sources	2022-02-22	Paper
A regularization operator for source identification for elliptic PDEs	2021-08-19	Paper
Numerical approximation of the spectrum of self-adjoint continuously invertible operators	2021-03-01	Paper
Generalized Spectrum of Second Order Differential Operators	2020-08-18	Paper
Laplacian Preconditioning of Elliptic PDEs: Localization of the Eigenvalues of the Discretized Operator	2019-09-02	Paper
Regularization of ill-posed point neuron models	2018-07-24	Paper
https://portal.mardi4nfdi.de/entity/Q4597503	2017-12-13	Paper
Robust preconditioners for PDE-constrained optimization with limited observations	2017-06-22	Paper
Ill-posed point neuron models	2017-01-04	Paper
PDE-Constrained Optimization with Local Control and Boundary Observations: Robust Preconditioners	2016-11-02	Paper
The split Bregman algorithm applied to PDE-constrained optimization problems with total variation regularization	2016-07-01	Paper
Analysis of the Minimal Residual Method Applied to Ill Posed Optimality Systems	2013-06-26	Paper
Efficient Preconditioners for Optimality Systems Arising in Connection with Inverse Problems	2011-03-21	Paper
Stability analysis of the inverse transmembrane potential problem in electrocardiography	2010-11-17	Paper
Elements of Scientific Computing	2010-10-08	Paper
Towards a computational method for imaging the extracellular potassium concentration during regional ischemia	2009-09-01	Paper
An order optimal solver for the discretized bidomain equations	2009-08-17	Paper
A note on the efficiency of the conjugate gradient method for a class of time-dependent problems	2009-08-17	Paper
The multigrid algorithm applied to a degenerate equation: A convergence analysis	2009-03-02	Paper
Preconditioning by inverting the Laplacian: an analysis of the eigenvalues	2009-02-06	Paper
Penalty methods for the numerical solution of American multi-asset option problems	2008-11-06	Paper
On the possibility for computing the transmembrane potential in the heart with a one shot method: an inverse problem	2008-03-28	Paper
A linear system of partial differential equations modeling the resting potential of a heart with regional ischemia	2008-02-25	Paper
Optimal monodomain approximations of the bidomain equations	2007-05-14	Paper
On the use of the resting potential and level set methods for identifying ischemic heart disease: An inverse problem	2007-02-19	Paper
Computing the Electrical Activity in the Heart	2006-10-18	Paper
https://portal.mardi4nfdi.de/entity/Q5479957	2006-07-25	Paper
A note on arbitrage‐free pricing of forward contracts in energy markets	2004-09-06	Paper
Stochastic structural modeling	2004-08-06	Paper
An analysis of a preconditioner for the discretized pressure equation arising in reservoir simulation	2000-03-02	Paper
An upscaling method for one-phase flow in heterogeneous reservoirs. A weighted output least squares (WOLS) approach	1999-10-20	Paper
A finite element method for fully nonlinear water waves	1999-06-20	Paper
Finite Element Discretizations of Elliptic Problems in the Presence of Arbitrarily Small Ellipticity: An Error Analysis	1999-05-19	Paper
https://portal.mardi4nfdi.de/entity/Q4370518	1998-03-05	Paper
On the Approximation of the Solution of the Pressure Equation by Changing the Domain	1997-08-26	Paper
On the Stability of Pressure and Velocity Computations for Heterogeneous Reservoirs	1996-10-22	Paper

Research outcomes over time

Doctoral students

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