Bøker av Stefan Nickel

The book provides a unique analysis of current air pollution in Germany by correlating results from chemical transport modelling and accumulation monitoring by moss.Results of most recent modelling of atmospheric concentration and deposition of the metal elements Cd, Hg and Pb are compared with the results of technical measurements and bioindication with mosses. These modelling results with status 2020 have a higher spatial resolution of 0.1° x 0.1° than the modelling results valid up to then (50 km x 50 km). This leads to partly slightly higher correlations between the findings of the modelling and those of the moss monitoring. In this study, descriptive and correlation-statistical parameters are calculated, results and recommendations drawn described. A statistically adequately deepened analysis and evaluation of the highresolution modelling results requires additional methodological tools, which are outlined in summary. It is particularly important to link the exposure data from modelling, technical measurements and the findings from moss monitoring with information on the receptors, the ecosystem types. This is the only way to ensure that the results of the present project contribute to a more differentiated assessment of the impacts on ecosystems from atmospheric heavy metal deposition than has been the case to date, thus enabling a targeted further development of risk assessments for German

This textbook offers a comprehensive, up-to-date introduction to the Optimization Programming Language (OPL). Embedded in the IBM ILOG CPLEX Optimization Studio with its solver engine CPLEX, OPL has been popular for years not only for academic and scientific purposes, but also among practitioners who need to model and solve large-scale real-world business optimization problems. The book covers the recent features of the software and includes ten consecutive tutorials, each with additional exercises, as well as several comprehensive application studies.The book is specifically designed for advanced undergraduate and graduate courses in e.g. management science, operations research, computer science, mathematics, mathematical economics, and industrial engineering. It can also serve as self-study material for practitioners whose work involves the modeling and optimization of planning and decision problems and who need a sound introduction to the software.Solutions to the exercises as well as the source codes from the textbook are available for download (weblink included).

Das vorliegende Lehrbuch ist eine Einführung in das Operations Research, die mathematisch stringent vorgeht, ohne jedoch den Leser mit Beweisen zu überfrachten. Stattdessen werden die mathematischen Sachverhalte ausführlich begründet und durch weit mehr als einhundert Abbildungen illustriert. Das Buch ist gleichermaßen für Ingenieure, Mathematiker und Wirtschaftswissenschaftler geeignet.Mit mehr als vierhundert Seiten stellen die Autoren genügend Auswahlmöglichkeiten zur Verfügung, um es als Grundlage für unterschiedlich angelegte Operations-Research-Vorlesungen zu verwenden. Darüber hinaus setzt dieses Buch an den richtigen Stellen neue Akzente und bereichert den Bestand der bisherigen Lehrbücher zu diesem Fachgebiet. Ein ausführlicher Anhang verdeutlicht die für das Verständnis des Buches notwendigen mathematischen Grundkonzepte, um den unterschiedlichen Voraussetzungen in der Vielfalt der Bachelor- und Masterprogramme Rechnung zu tragen.Die korrigierte und erweiterte dritte Auflage dieses Buches erhält ein neues, ausführliches Kapitel zur stochastischen Optimierung.

Although modern location theory is now more than 90 years old, the focus of researchers in this area has been mainly problem oriented.