Rolf Klein – författare

This is the first detailed description in English of radiation and polymeric material interaction and the influences of thermal and optical material properties. As such, it provides comprehensive information on material and process characteristics as well as applications regarding plastic laser welding. The first part of this practical book introduces the structure and physical properties of plastics, before discussing the interaction of material and radiation in the NIR and IR spectral range. This is followed by an overview of the physical foundations of laser radiation and laser sources used for plastic welding. The third part describes the main processes of laser welding thermoplastics, as well as possibilities of process control, design of joint geometry, material compatibilities and adaptation of absorption of plastics to NIR radiation. Finally, the author explains applications of laser welding plastics using several industrial case studies from the automotive industry, household goods, and medical devices. Tailored to the needs of everyone dealing with laser welding of plastics, especially engineers in packaging, component manufacturing, and the medical industry.

This is the first detailed description in English of radiation and polymeric material interaction and the influences of thermal and optical material properties. As such, it provides comprehensive information on material and process characteristics as well as applications regarding plastic laser welding. The first part of this practical book introduces the structure and physical properties of plastics, before discussing the interaction of material and radiation in the NIR and IR spectral range. This is followed by an overview of the physical foundations of laser radiation and laser sources used for plastic welding. The third part describes the main processes of laser welding thermoplastics, as well as possibilities of process control, design of joint geometry, material compatibilities and adaptation of absorption of plastics to NIR radiation. Finally, the author explains applications of laser welding plastics using several industrial case studies from the automotive industry, household goods, and medical devices. Tailored to the needs of everyone dealing with laser welding of plastics, especially engineers in packaging, component manufacturing, and the medical industry.

By presenting state-of-the-art aspects of theoretical computer science and practical applications in various fields, this book commemorates the 60th birthday of Thomas Ottmann. The 26 research papers presented span the whole range of Thomas Ottmann's scientific career, from formal languages to algorithms and data structures, from topics in practical computer science like software engineering or database systems to applications of Web technology, groupware, and e-learning.

Robotics is a highly interdisciplinary research topic, that requires integration of methods for mechanics, control engineering, signal processing, planning, gra- ics, human-computer interaction, real-time systems, applied mathematics, and software engineering to enable construction of fully operational systems. The diversity of topics needed to design, implement, and deploy such systems implies that it is almost impossible for individual teams to provide the needed critical mass for such endeavors. To facilitate interaction and progress on sensor-based intelligent robotics inter-disciplinary workshops are necessary through which - depthdiscussioncanbeusedforcrossdisseminationbetweendi?erentdisciplines. The Dagstuhl foundation has organized a number of workshops on Mod- ing and Integration of Sensor Based Intelligent Robot Systems. The Dagstuhl seminars take place over a full week in a beautiful setting in the Saarland in Germany. The setting provides an ideal environment for in-depth presentations and rich interaction between the participants. This volume contains papers presented during the fourth workshop held - tober 15–20, 2000. All papers were submitted by workshop attendees, and were reviewed by at least one reviewer. We wish to thank all of the reviewers for their invaluable help in making this a high-quality selection of papers. We gratefully acknowledge the support of the Schloss Dagstuhl Foundation and the sta? at Springer-Verlag. Without their support the production of this volume would not have been possible.

Robotics is a highly interdisciplinary research topic, that requires integration of methods for mechanics, control engineering, signal processing, planning, gra- ics, human-computer interaction, real-time systems, applied mathematics, and software engineering to enable construction of fully operational systems. The diversity of topics needed to design, implement, and deploy such systems implies that it is almost impossible for individual teams to provide the needed critical mass for such endeavors. To facilitate interaction and progress on sensor-based intelligent robotics inter-disciplinary workshops are necessary through which - depthdiscussioncanbeusedforcrossdisseminationbetweendi?erentdisciplines. The Dagstuhl foundation has organized a number of workshops on Mod- ing and Integration of Sensor Based Intelligent Robot Systems. The Dagstuhl seminars take place over a full week in a beautiful setting in the Saarland in Germany. The setting provides an ideal environment for in-depth presentations and rich interaction between the participants. This volume contains papers presented during the fourth workshop held - tober 15–20, 2000. All papers were submitted by workshop attendees, and were reviewed by at least one reviewer. We wish to thank all of the reviewers for their invaluable help in making this a high-quality selection of papers. We gratefully acknowledge the support of the Schloss Dagstuhl Foundation and the sta? at Springer-Verlag. Without their support the production of this volume would not have been possible.

The Voronoi diagram of a set of sites is a partition of the plane into regions, one to each site, such that the region of each site contains all points of the plane that are closer to this site than to the other ones. Such partitions are of great importance to computer science and many other fields. The challenge is to compute Voronoi diagrams quickly. The problem is that their structure depends on the notion of distance and the sort of site. In this book the author proposes a unifying approach by introducing abstract Voronoi diagrams. These are based on the concept of bisecting curves, which are required to have some simple properties that are actually possessed by most bisectors of concrete Voronoi diagrams. Abstract Voronoi diagrams can be computed efficiently and there exists a worst-case efficient algorithm of divide-and-conquer type that applies to all abstract Voronoi diagrams satisfying a certain constraint. The author shows that this constraint is fulfilled by the concrete diagrams based on large classes of metrics in the plane.

Wie bestimmt man in einer Menge von Punkten am schnellsten zu jedem Punkt seinen nächsten Nachbarn? Wie findet man schnell alle Städte in einem rechteckigen Kartenausschnitt? Wie misst man die Ähnlichkeit von zwei Kurven?Mit solchen Fragen beschäftigt sich die Algorithmische Geometrie. Dieses Buch gibt eine Einführung in algorithmische Techniken wie Sweep, Divide-and-Conquer, randomisierte inkrementelle Konstruktion, Dynamisierung, amortisierte Kostenanalyse und kompetitive Analyse. Es stellt wichtige geometrische Strukturen, wie konvexe Hülle, Voronoi-Diagramm und Delaunay-Triangulation sowie effiziente Datenstrukturen vor.Diese dritte Auflage wurde gründlich überarbeitet und erweitert. Sie bietet Dozent*innen die Möglichkeit, für Vorlesungen und Seminare eine individuelle Stoffauswahl zu treffen, auch zu weiterführenden Themen wie zum Beispiel ausgewogene höherdimensionale Suchbäume, schnelle Triangulierung, Vapnik-Chervonenkis Dimension, Ähnlichkeitsberechnung von Kurven, Bewegungsplanung und Inzidenzen geometrischer Objekte.

Wie bestimmt man in einer Menge von Punkten am schnellsten zu jedem Punkt seinen nächsten Nachbarn? Wie findet man schnell alle Städte in einem rechteckigen Kartenausschnitt? Wie misst man die Ähnlichkeit von zwei Kurven?Mit solchen Fragen beschäftigt sich die Algorithmische Geometrie. Dieses Buch gibt eine Einführung in algorithmische Techniken wie Sweep, Divide-and-Conquer, randomisierte inkrementelle Konstruktion, Dynamisierung, amortisierte Kostenanalyse und kompetitive Analyse. Es stellt wichtige geometrische Strukturen, wie konvexe Hülle, Voronoi-Diagramm und Delaunay-Triangulation sowie effiziente Datenstrukturen vor.Diese dritte Auflage wurde gründlich überarbeitet und erweitert. Sie bietet Dozent*innen die Möglichkeit, für Vorlesungen und Seminare eine individuelle Stoffauswahl zu treffen, auch zu weiterführenden Themen wie zum Beispiel ausgewogene höherdimensionale Suchbäume, schnelle Triangulierung, Vapnik-Chervonenkis Dimension, Ähnlichkeitsberechnung von Kurven, Bewegungsplanung und Inzidenzen geometrischer Objekte.

Was passiert in entwickelten Industrieländern mit breiten Schichten der Bevölkerung – den unteren 90 Prozent – wenn sich die Staaten als Teilnehmer eines globalen Wettbewerbs verstehen? Was bedeutet das für den politischen Einfluss der Bürger? Sind Antworten auf den Klimawandel, die Digitalisierung, das Auseinanderdriften der Gesellschaft möglich, ohne unsere Position im Wettbewerb zu schwächen? Was ist dran am Bild vom "Standortwettbewerb"? Auf der Basis ökonomischer Einsichten wird ein politischer Kampfbegriff entzaubert. Am Ende der Analyse steht die Erkenntnis: Leistungsfähige Staaten haben mehr Gestaltungsfreiheit, als gemeinhin angenommen wird. Deutschland und die Europäische Union handeln aber deutlich unter ihren Möglichkeiten.