Lutz Angermann – författare

This monograph deals with theoretical aspects and numerical simulations of the interaction of electromagnetic fields with nonlinear materials. It focuses in particular on media with nonlinear polarization properties. It addresses the direct problem of nonlinear Electrodynamics, that is to understand the nonlinear behavior in the induced polarization and to analyze or even to control its impact on the propagation of electromagnetic fields in the matter. The book gives a comprehensive presentation of the results obtained by the authors during the last decade and put those findings in a broader, unified context and extends them in several directions.It is divided into eight chapters and three appendices. Chapter 1 starts from the Maxwell’s equations and develops a wave propagation theory in plate-like media with nonlinear polarizability. In chapter 2 a theoretical framework in terms of weak solutions is given in order to prove the existence and uniqueness of a solution of the semilinear boundary-value problem derived in the first chapter. Chapter 3 presents a different approach to the solvability theory of the reduced frequency-domain model. Here the boundary-value problem is reduced to finding solutions of a system of one-dimensional nonlinear Hammerstein integral equations. Chapter 4 describes an approach to the spectral analysis of the linearized system of integral equations. Chapters 5 and 6 are devoted to the numerical approximation of the solutions of the corresponding mathematical models. Chapter 7 contains detailed descriptions, discussions and evaluations of the numerical experiments. Finally, chapter 8 gives a summary of the results and an outlook for future work.

This graduate-level text provides an application oriented introduction to the numerical methods for elliptic and parabolic partial differential equations. It covers finite difference, finite element, and finite volume methods, interweaving theory and applications throughout. The book examines modern topics such as adaptive methods, multilevel methods, and methods for convection-dominated problems and includes detailed illustrations and extensive exercises. For students with mathematics major it is an excellent introduction to the theory and methods, guiding them in the selection of methods and helping them to understand and pursue finite element programming. For engineering and physics students it provides a general framework for the formulation and analysis of methods. This second edition sees additional chapters on mixed discretization and on generalizing and unifying known approaches; broader applications on systems of diffusion, convection and reaction; enhanced chapters on node-centered finite volume methods and methods of convection-dominated problems, specifically treating the now-popular cell-centered finite volume method; and the consideration of realistic formulations beyond the Poisson's equation for all models and methods.

This graduate-level text provides an application oriented introduction to the numerical methods for elliptic and parabolic partial differential equations. It covers finite difference, finite element, and finite volume methods, interweaving theory and applications throughout. The book examines modern topics such as adaptive methods, multilevel methods, and methods for convection-dominated problems and includes detailed illustrations and extensive exercises. For students with mathematics major it is an excellent introduction to the theory and methods, guiding them in the selection of methods and helping them to understand and pursue finite element programming. For engineering and physics students it provides a general framework for the formulation and analysis of methods. This second edition sees additional chapters on mixed discretization and on generalizing and unifying known approaches; broader applications on systems of diffusion, convection and reaction; enhanced chapters on node-centered finite volume methods and methods of convection-dominated problems, specifically treating the now-popular cell-centered finite volume method; and the consideration of realistic formulations beyond the Poisson''s equation for all models and methods.

This graduate-level text provides an application oriented introduction to the numerical methods for elliptic and parabolic partial differential equations. It covers finite difference, finite element, and finite volume methods, interweaving theory and applications throughout. The book examines modern topics such as adaptive methods, multilevel methods, and methods for convection-dominated problems and includes detailed illustrations and extensive exercises. For students with mathematics major it is an excellent introduction to the theory and methods, guiding them in the selection of methods and helping them to understand and pursue finite element programming. For engineering and physics students it provides a general framework for the formulation and analysis of methods. This second edition sees additional chapters on mixed discretization and on generalizing and unifying known approaches; broader applications on systems of diffusion, convection and reaction; enhanced chapters on node-centered finite volume methods and methods of convection-dominated problems, specifically treating the now-popular cell-centered finite volume method; and the consideration of realistic formulations beyond the Poisson's equation for all models and methods.

This monograph deals with theoretical aspects and numerical simulations of the interaction of electromagnetic fields with nonlinear materials. It focuses in particular on media with nonlinear polarization properties. It addresses the direct problem of nonlinear Electrodynamics, that is to understand the nonlinear behavior in the induced polarization and to analyze or even to control its impact on the propagation of electromagnetic fields in the matter. The book gives a comprehensive presentation of the results obtained by the authors during the last decade and put those findings in a broader, unified context and extends them in several directions.It is divided into eight chapters and three appendices. Chapter 1 starts from the Maxwell’s equations and develops a wave propagation theory in plate-like media with nonlinear polarizability. In chapter 2 a theoretical framework in terms of weak solutions is given in order to prove the existence and uniqueness of a solution of the semilinear boundary-value problem derived in the first chapter. Chapter 3 presents a different approach to the solvability theory of the reduced frequency-domain model. Here the boundary-value problem is reduced to finding solutions of a system of one-dimensional nonlinear Hammerstein integral equations. Chapter 4 describes an approach to the spectral analysis of the linearized system of integral equations. Chapters 5 and 6 are devoted to the numerical approximation of the solutions of the corresponding mathematical models. Chapter 7 contains detailed descriptions, discussions and evaluations of the numerical experiments. Finally, chapter 8 gives a summary of the results and an outlook for future work.

This monograph deals with theoretical aspects and numerical simulations of the interaction of electromagnetic fields with nonlinear materials. It focuses in particular on media with nonlinear polarization properties. It addresses the direct problem of nonlinear Electrodynamics, that is to understand the nonlinear behavior in the induced polarization and to analyze or even to control its impact on the propagation of electromagnetic fields in the matter. The book gives a comprehensive presentation of the results obtained by the authors during the last decade and put those findings in a broader, unified context and extends them in several directions.It is divided into eight chapters and three appendices. Chapter 1 starts from the Maxwell’s equations and develops a wave propagation theory in plate-like media with nonlinear polarizability. In chapter 2 a theoretical framework in terms of weak solutions is given in order to prove the existence and uniqueness of a solution of the semilinear boundary-value problem derived in the first chapter. Chapter 3 presents a different approach to the solvability theory of the reduced frequency-domain model. Here the boundary-value problem is reduced to finding solutions of a system of one-dimensional nonlinear Hammerstein integral equations. Chapter 4 describes an approach to the spectral analysis of the linearized system of integral equations. Chapters 5 and 6 are devoted to the numerical approximation of the solutions of the corresponding mathematical models. Chapter 7 contains detailed descriptions, discussions and evaluations of the numerical experiments. Finally, chapter 8 gives a summary of the results and an outlook for future work.

Dieses Lehrbuch bietet eine Einführung in Diskretisierungsmethoden für partielle Differentialgleichungen. Im Mittelpunkt steht das Finite-Element-Verfahren, aber es werden auch Finite-Differenzen- und Finite-Volumen-Verfahren behandelt. Basierend auf einer mathematisch präzisen Darstellung von Verfahren und ihrer Theorie spannt der Text den Rahmen bis hin zur Finite-Element-Implementierung. Dies beinhaltet eine Einführung in moderne Entwicklungen wie Multilevel- oder adaptive Verfahren. Das Spektrum der behandelten Differentialgleichungen reicht von linearen elliptischen Randwertaufgaben bis zu - auch konvektionsdominierten - nichtlinearen parabolischen Problemen. Diese werden jeweils durch Modelle aus einem spezifischen Anwendungsgebiet illustriert. Das Lehrbuch entspricht im Umfang etwa einer einsemestrigen Veranstaltung mit Ergänzungen und wendet sich an Studierende der Mathematik und der Ingenieur- oder Naturwissenschaften nach dem Vordiplom.

Dieses Lehrbuch bietet eine Einführung in Diskretisierungsmethoden für partielle Differentialgleichungen. Im Mittelpunkt steht das Finite-Element-Verfahren, aber es werden auch Finite-Differenzen- und Finite-Volumen-Verfahren behandelt. Basierend auf einer mathematisch präzisen Darstellung von Verfahren und ihrer Theorie spannt der Text den Rahmen bis hin zur Finite-Element-Implementierung. Dies beinhaltet eine Einführung in moderne Entwicklungen wie Multilevel- oder adaptive Verfahren. Das Spektrum der behandelten Differentialgleichungen reicht von linearen elliptischen Randwertaufgaben bis zu - auch konvektionsdominierten - nichtlinearen parabolischen Problemen. Diese werden jeweils durch Modelle aus einem spezifischen Anwendungsgebiet illustriert. Das Lehrbuch entspricht im Umfang etwa einer einsemestrigen Veranstaltung mit Ergänzungen und wendet sich an Studierende der Mathematik und der Ingenieur- oder Naturwissenschaften nach dem Vordiplom.

Dieses handliche Lehrbuch stellt akzentuiert diejenigen Inhalte aus Analysis und Linearer Algebra sowie grundlegende mathematische Fähigkeiten und Fertigkeiten dar, die für ein Studium der Mathematik bereits in den ersten beiden Semestern unverzichtbar und für andere Mathematik-nahe Studiengänge in Umfang und Tiefe dennoch vertretbar und realistisch zu bewältigen sind.Dafür werden einige Themen, die in herkömmlichen, separaten Lehrveranstaltungszyklen zu Analysis und Linearer Algebra weitgehend kanonisch sind, hier bewusst ausgelassen – diese können je nach Bedarf anderweitig vertieft werden.Insbesondere Studierende der Informatik, der Physik oder auch des Lehramts lernen Mathematik hier nicht als Ansammlung anwendungsbereiter Ergebnisse, sondern als wohlkonstruiertes Gebäude aus Abstraktion, axiomatischen Strukturen, Sätzen und Beweisen kennen.Passende Übungsaufgaben werden jeweils am Ende der jeweiligen Kapitel angeboten; wenige optionale ergänzende Abschnitte sind als solche gekennzeichnet.