Bøger af Willi Freeden

The book provides the geoscientific context, that arises in gravimetric/magnetometric exploration. It essentially uses mathematics as a key technology for modeling issues on the basis of analysis and interpretation according to dense and precise gravitational/magnetic measurements. It is dedicated to surface and deep geology with potential data primarily of terrestrial origin. The book spans the interdisciplinary arc from geoengineering, especially geodesy, via geophysics to geomathematics and geology, and back again. It presents the recently published pioneering and groundbreaking multiscale mollifier methodologies realizing the bridging transfer from gravitational/magnetic measurements to approximative/numerical mollifier wavelet decorrelations with novel geologic prospects and layer-structure determination as outcome. Using the specific example of the German Saarland region, new important fields of application, especially for areas with mining-related cavities, will be opened up and subjected to an in-depth geologic detection.

During the last three decades geosciences and geo-engineering were influenced by two essential scenarios: First, the technological progress has changed completely the observational and measurement techniques. Modern high speed computers and satellite based techniques are entering more and more all geodisciplines. Second, there is a growing public concern about the future of our planet, its climate, its environment, and about an expected shortage of natural resources. Obviously, both aspects, viz. efficient strategies of protection against threats of a changing Earth and the exceptional situation of getting terrestrial, airborne as well as spaceborne data of better and better quality explain the strong need of new mathematical structures, tools, and methods. Mathematics concerned with geoscientific problems, i.e., Geomathematics, is becoming increasingly important.The 'Handbook Geomathematics' as a central reference work in this area comprises the following scientific fields: (I) observational and measurement key technologies (II) modelling of the system Earth (geosphere, cryosphere, hydrosphere, atmosphere, biosphere) (III) analytic, algebraic, and operator-theoretic methods (IV) statistical and stochastic methods (V) computational and numerical analysis methods (VI) historical background and future perspectives.

Die Entwicklung immer leistungsfähigerer absoluter wie auch relativer Gravimeter mit deutlich verbesserter Messgenauigkeit ermöglicht es, dass sich künftig nicht nur prägnante Schwereanomalien (wie z. B. die eines Salzstocks), sondern auch schwächere Signaturen erfassen und modellieren lassen. Mehr noch, die rasante Entwicklung der Computer führt zu neuartigen Methoden der Datendekomposition, wie z. B. Waveletdekorrelation. Dekorrelative Gravimetrie ist somit eine neue Explorationstechnik, die als kanonische Innovation aus der Verbindung neuartiger Mess- und Modellierungstechniken resultiert.Dekorrelative Gravimetrie dient der Reduzierung des Fündigkeitsrisikos von Aquiferen sowie von Gas- und Öllagerstätten, auch durch Vergleich und Zusammenschau alternativer, aber strukturell ähnlich gelagerter, dekorrelativer Verfahren wie etwa Magnetometrie und Seismik. Hier setzt dieses Buch mit einem exemplarischen Überblick über die neuartige Dekorrelationsmethoden der heutigen Geomathematik mit Hauptgewicht für den Fall der Gravimetrie an. Wesentliches mathematisches Hilfsmittel ist die Regularisierung des Newtonschen Volumenintegrals durch taylorisierte Mollifier-Varianten des Newton-Kerns.Ziel des vorliegenden Buches ist somit die Vermittlung des Grundverständnisses, dass Zooming-In Mollifier-Potentialmethoden wie etwa dekorrelative Gravimetrie neue wichtige Anwendungsfelder in der heutigen Geoexploration eröffnen, insbesondere für Gebiete mit bergbaubedingten Hohlräumen oder sehr dichter Bebauung wie etwa das Saarland oder Sachsen, die den Einsatz von reflexionsseismischen Messungen erschweren oder sogar unmöglich machen.Zusammenfassend lässt sich für dieses Buchprojekt festhalten, dass es einen Einblick in den aktuellen Stand gravimetrischer Multiskalenforschung vermittelt. Als wesentliches Resultat ergibt sich, dass die Schlüsseltechnologie Geomathematik in der Tat in der Lage ist, die Gravimetrie auf einfache, für Explorationszwecke zugängliche und somit rechenbare Dekorrelationsmodelle zu reduzieren. Mehr noch, das Buch macht auf diese Weise ein breites Publikum mit den vielfältigen Fragen und Problemen der heutigen Gravimetrie vertraut und setzt Denkanstöße für eine erfolgreiche Weiterentwicklung und eine adäquate praxisrelevante Anwendbarkeit von Potentialmethoden in der Exploration in Gang.

This book presents, in a consistent and unified overview, results and developments in the field of todays spherical sampling, particularly arising in mathematical geosciences.

The authors introduce geomathematics as an active research area to a wider audience. In the second chapter geomathematics is introduced as a new scientific area which nevertheless has its roots in antiquity. The Appendix (Chapter 5) is devoted to the GEM - International Journal on Geomathematics founded ten years ago.

This book presents, in a consistent and unified overview, results and developments in the field of todays spherical sampling, particularly arising in mathematical geosciences.

Special functions enable us to formulate a scientific problem by reduction such that a new, more concrete problem can be attacked within a well-structured framework, usually in the context of differential equations. A good understanding of special functions provides the capacity to recognize the causality between the abstractness of the mathematical concept and both the impact on and cross-sectional importance to the scientific reality. The special functions to be discussed in this monograph vary greatly, depending on the measurement parameters examined (gravitation, electric and magnetic fields, deformation, climate observables, fluid flow, etc.) and on the respective field characteristic (potential field, diffusion field, wave field). The differential equation under consideration determines the type of special functions that are needed in the desired reduction process. Each chapter closes with exercises that reflect significant topics, mostly in computational applications. As a result, readers are not only directly confronted with the specific contents of each chapter, but also with additional knowledge on mathematical fields of research, where special functions are essential to application. All in all, the book is an equally valuable resource for education in geomathematics and the study of applied and harmonic analysis. Students who wish to continue with further studies should consult the literature given as supplements for each topic covered in the exercises.

This work presents the principles of space and surface potential theory involving Euclidean and spherical concepts. It offers new insight on how to mathematically handle gravitation and geomagnetism for the relevant observables and how to solve the resulting potential problems in a systematic, mathematically rigorous framework. The authors build the foundation of potential theory in three-dimensional Euclidean space and its application to gravitation and geomagnetism. They then discuss surface potential theory on the unit sphere along with corresponding applications.

During the last few decades, the subject of potential theory has not been overly popular in the mathematics community. Neglected in favor of more abstract theories, it has been taught primarily where instructors have ac­ tively engaged in research in this field. This situation has resulted in a scarcity of English language books of standard shape, size, and quality covering potential theory. The current book attempts to fill that gap in the literature. Since the rapid development of high-speed computers, the remarkable progress in highly advanced electronic measurement concepts, and, most of all, the significant impact of satellite technology, the flame of interest in potential theory has burned much brighter. The realization that more and more details of potential functions are adequately visualized by "zooming­ in" procedures of modern approximation theory has added powerful fuel to the flame. It seems as if, all of a sudden, harmonic kernel functions such as splines and/or wavelets provide the impetus to offer appropriate means of assimilating and assessing the readily increasing flow of potential data, reducing it to comprehensible form, and providing an objective basis for scientific interpretation, classification, testing of concepts, and solutions of problems involving the Laplace operator.

Provides a basic foundation for students, practitioners, and researchers interested in some of the diverse areas of multiscale (geo)potential theory. This book develops mathematical methods enabling the gravitational potential of a planetary body to be modeled and analyzes using a continuous flow of observations from land or satellite devices.

In recent years, the Geomathematics Group, TU Kaiserslautern, has worked to set up a theory of spherical functions of mathematical physics. This book is a collection of all the material that group generated during the process.