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Tobias Wagner

    Workshop zur Entwicklung nachhaltiger Innovationen. Nachhaltigkeitsmanagement
    Death in Brachstedt
    Planning and multi-objective optimization of manufacturing processes by means of empirical surrogate models
    Modelling of wind born ice accretion on power transmission lines
    Inquisitio in Oracula Sybillarum de Christo, Occasione Orationis Anno 1662
    Religion in Latvian Society. Current State and Historic Background
    • 2024

      Exploring the interplay between religion and contemporary Latvian society, this essay examines how historical events have influenced religious beliefs and practices in Latvia. It analyzes the current religious landscape, including the beliefs of Latvians, the proportion of believers versus non-believers, and the reciprocal relationship between religion and national history. The work provides insights into the cultural significance of religion in Latvia during the 20th century, highlighting its impact on societal values and identity.

      Religion in Latvian Society. Current State and Historic Background
    • 2017

      Inquisitio in Oracula Sybillarum de Christo, Occasione Orationis Anno 1662

      In pervigilio Nativitatis salutiferæ de iisdem habitæ, per annotationes varias instituta à Tobia Wagnero

      • 116 pages
      • 5 hours of reading

      This book presents a high-quality reprint of a 1664 work that explores the Sibylline Oracles in relation to Christ, focusing on insights gathered during a sermon delivered on Christmas Eve in 1662. The text includes various annotations by Tobias Wagner, offering a scholarly examination of the prophetic writings and their implications for Christian theology. This edition preserves the original's content, making it a valuable resource for those interested in historical religious texts and interpretations.

      Inquisitio in Oracula Sybillarum de Christo, Occasione Orationis Anno 1662
    • 2013

      Das Institut für Spanende Fertigung (ISF) unter der Leitung von Prof. Dr.-Ing. Dirk Biermann beschäftigt sich seit mehr als vier Jahrzehnten in Forschung und Lehre mit allen relevanten Zerspanprozessen ebenso wie mit dem informationstechnischen Umfeld der Zerspanung. Betrachtet werden die Verfahren Drehen, Bohren, Tiefbohren, Fräsen, Schleifen, Honen und Strahlen. Viele der genannten Prozesse werden am ISF im Hochgeschwindigkeits- (HSC) oder im Hochleistungsbereich (HPC) betrieben und innerhalb aktueller Forschungsarbeiten ständig weiter qualifiziert. Darüber hinaus stellen die Mikrobearbeitung (beim Bohren, Tiefbohren und Fräsen) und die Trocken- bzw. die Minimalmengenbearbeitung zentrale Aspekte der Arbeiten am ISF dar. Die Durchführung von virtuellen Zerspanprozessen auf der Basis verschiedener Modellierungskonzepte sowie die Optimierung in der Fertigungstechnik stehen ebenfalls im Fokus der wissenschaftlichen Arbeiten. Das Spektrum der genannten Forschungsfelder reicht dabei von eher grundlagenorientierten, also z. B. im Rahmen von öffentlich geförderten Forschungsvorhaben durchgeführten bis hin zu anwendungsbezogenen Projekten, die in direkter Kooperation mit Partnern aus der Industrie bearbeitet werden.

      Planning and multi-objective optimization of manufacturing processes by means of empirical surrogate models
    • 2011

      The work presented here enables us to numerically simulate ice accretion on transmission lines. Ice loads can cause significant damage to electric power transmission networks, especially in combination with wind. Overhead lines can collapse due to the mass of ice deposits, but also additional loads due to so-called Galloping oscillation can cause significant damage on the structures. Aerodynamic instability of cables due to ice accretion is a known phenomenon. Investigating shape and density of the ice accretion through experiments is very complex. Therefore, a numerical model is presented to simulate ice accretion processes on cables. The model is divided into two main parts, the calculation of the flow field and the ice accretion. The stream of air and precipitation particles is modelled as a one-way coupled multiphase flow. Ice accretion and flow field are calculated iteratively to account for geometrical changes of the ice deposit in the flow calculation. Finally, a risk management framework and its implications for power outages are investigated. Monetary losses due to blackouts increase exponentially with time. The presented approach evaluates variation in outage duration and compares the risk of blackouts to other types of disasters.

      Modelling of wind born ice accretion on power transmission lines