Relevant bibliographies by topics / Universität Hannover

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Universität Hannover'

Author: Grafiati
Published: 4 June 2021
Last updated: 28 July 2024

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Journal articles on the topic "Universität Hannover"

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Lengsfeld, Stephan. "Institut für Controlling der Leibniz Universität Hannover." Controlling & Management 54, no. 3 (2010): 199–200. http://dx.doi.org/10.1007/s12176-010-0062-7.

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Vogel, Florian, Dirk Biermann, Manuel Rodriguez Diaz, and Kai Möhwald. "Erhöhte Haftfestigkeit thermischer Spritzschichten/Increased adhesion of thermal sprayed coatings – Innovative process combination enables substitution of conventional blasting processes." wt Werkstattstechnik online 112, no. 01-02 (2022): 28–33. http://dx.doi.org/10.37544/1436-4980-2022-01-02-32.

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Um thermische Spritzschichten mit erhöhter Haftfestigkeit zu realisieren, erfolgte am Institut für Spanende Fertigung (ISF) der Technischen Universität Dortmund und dem Institut für Werkstoffkunde (IW) der Leibniz Universität Hannover die Entwicklung einer innovativen Verfahrenskombination. Darauf aufbauend wurde untersucht, ob die Schichteigenschaften durch einen zusätzlichen Prozessschritt weiter optimierbar sind, um zukünftig Verschleißschutzbeschichtungen ohne eine Substrataktivierung durch Strahlen zu ermöglichen.   To enable thermal sprayed coatings with increased adhesion, the Institute of Machining Technology (ISF) of TU Dortmund University together with the Institute of Materials Science (IW) of Leibniz Universität Hannover developed an innovative process combination. This serves as a basis for investigating whether the coating properties can be further optimized by an additional process step to allow for the production of wear-resistant coatings in the future without substrate activation by blasting.
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Behrens, B. A., A. Huskic, C. Frischkorn, and D. Duran. "Fließpressen hybrider Halbzeuge*/Extrusion of hybrid semi-finished workpieces." wt Werkstattstechnik online 105, no. 10 (2015): 704–8. http://dx.doi.org/10.37544/1436-4980-2015-10-40.

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Im Rahmen des neu eingerichteten Sonderforschungsbereichs 1153 „Prozesskette zur Herstellung hybrider Hochleistungsbauteile durch Tailored Forming“ der Leibniz Universität Hannover wird am Institut für Umformtechnik und Umformmaschinen (IFUM) die Formgebung gefügter Halbzeuge zu hybriden Massivbauteilen untersucht. Dieser Fachbeitrag stellt erste Ergebnisse zum Fließpressen von seriell angeordneten Hybridhalbzeugen aus reibgeschweißten Stahl/Aluminium-Verbunden vor.   As part of the newly established Collaborative Research Center 1153 “Process chain for the manufacturing of hybrid high-performance components by Tailored Forming” at Leibniz Universität Hannover, the Institute of Forming Technology and Machines (IFUM) examines the forming of joined semi-finished workpieces to hybrid solid components. In this paper, preliminary findings of the extrusion of friction welded steel/aluminium combination are presented.
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Wnendt, Eike, Berend Denkena, Heinrich Klemme, and Matthias Meier. "Elektrisches Spannfutter für die Drehbearbeitung/Electric chuck for turning – Electric chuck with high-precision clamping force control for thin-walled workpieces." wt Werkstattstechnik online 112, no. 07-08 (2022): 530–32. http://dx.doi.org/10.37544/1436-4980-2022-07-08-84.

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Eine Herausforderung beim Spannen dünnwandiger Werkstücke stellt die Fertigung engtolerierter Werkstücke dar. Aufgrund der geringen Steifigkeit dünnwandiger Werkstücke können durch zu hoch eingestellte Spannkräfte unzulässig hohe Maß- und Formabweichungen auftreten. Zusammen mit der HWR Spanntechnik GmbH erforscht das Institut für Fertigungstechnik und Werkzeugmaschinen (IFW) der Leibniz Universität Hannover daher ein neuartiges sensorisches Spannfutter zur präzisen Spannkrafteinstellung. Clamping thin-walled workpieces is a challenging problem in high precision turning. Due to the low stiffness of thin-walled workpieces, high workpiece deformations can occur when clamping forces are set too high. For this reason, a sensory chuck for precise clamping force adjustment is being researched by HWR Spanntechnik GmbH and the Institute of Production Engineering and Machine Tools (IFW) at Leibniz Universität Hannover.
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Mühlnikel, Ingrid. "Nicht leichtfertig." kma - Klinik Management aktuell 14, no. 07 (2009): 6. http://dx.doi.org/10.1055/s-0036-1575211.

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Auch in deutschen Krankenhäusern werden Leistungen aus wirtschaftlichen Gründen nicht erbracht. Zum Tagesgeschäft gehört Rationierung aber nicht, hat eine Studie der Universität Tübingen und der Medizinischen Hochschule Hannover ergeben.
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Heckemeyer, Karolin, and Elke Gramespacher. "Der Sport zwischen Geschlechterbinarität und geschlechtlicher Vielfalt." Freiburger Zeitschrift für GeschlechterStudien 25, no. 1-2019 (2019): 123–36. http://dx.doi.org/10.3224/fzg.v25i1.06.

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Ein Interview mit Dr. Bettina Rulofs (Deutsche Sporthochschule Köln, DE) und Prof. Dr. Sandra Günter (Leibniz-Universität Hannover, DE), geführt von Karolin Heckemeyer und Elke Gramespacher (beide: Pädagogische Hochschule FHNW, CH)
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Behrens, B. A., R. Krimm, J. Jocker, and T. Nitschke. "Leistungsverzweigter Servopressenantrieb*/Power-split servo press drive - Control of a new servo press drive with mechanical power split." wt Werkstattstechnik online 105, no. 05 (2015): 291–96. http://dx.doi.org/10.37544/1436-4980-2015-05-43.

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Am Institut für Umformtechnik und Umformmaschinen der Leibniz Universität Hannover wird zurzeit an einer neuartigen Antriebslösung für Servopressen gearbeitet, welche die Vorteile von Servopressen und Exzenterpressen mit Schwungradantrieb vereint. Ziel ist, sowohl bei der Anschaffung als auch im Betrieb Kosten einzusparen. Für die Ansteuerung der Antriebsmotoren wurde ein spezielles Regelkonzept erarbeitet, das sich deutlich von bestehenden Regelungssystemen heutiger Servopressen abgrenzt.   At the Institute of Forming Technology and Machines (Leibniz Universität Hannover), a new drive concept for servo presses is being developed which combines the advantages of servo presses with a high dynamic powertrain and flywheel based eccentric presses. This is intended to save acquisition and operating costs. To control the drive engines, a special control concept has been developed which is completely different from control systems of modern servo presses.
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Thomsen, Stephan L., and Johannes Trunzer. "3G am Arbeitsplatz: zur Situation in niedersächsischen Unternehmen Ende 2021." Wirtschaftsdienst 102, no. 2 (2022): 127–32. http://dx.doi.org/10.1007/s10273-022-3111-x.

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ZusammenfassungDurch die Änderung des Infektionsschutzgesetzes Ende November 2021 wurde die Abbildung der 3G- und 2G-Quoten auf betrieblicher Ebene knapp ein Jahr nach Beginn der Impfungen möglich. Mithilfe einer Online-Blitzumfrage der Unternehmerverbände Niedersachsen, IHK Hannover, creditreform und dem Institut für Wirtschaftspolitik der Leibniz Universität Hannover zum Impf- und Genesenenstatus (2G), zur Zahl von Antigen-Schnelltests sowie dem Beschäftigtenanteil im Homeoffice können nun wichtige Hinweise auf die allgemeine Gefährdungslage im wirtschaftlichen und beruflichen Alltag sowie auf den damit verbundenen organisatorischen Aufwand in den Betrieben gegeben werden.
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Mühlnikel, Ingrid. "Politische Glaubwürdigkeit." kma - Klinik Management aktuell 14, no. 07 (2009): 82. http://dx.doi.org/10.1055/s-0036-1575245.

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Die Universität Tübingen und die Medizinische Hochschule Hannover haben kürzlich in einer Umfrage unter Klinikärzten herausgefunden: Rationiert wird in deutschen Krankenhäusern wirklich selten (siehe S. 6). Es kommt vor, dass die Mediziner eine Leistung aus wirtschaftlichen Gründen nicht gewähren, aber das ist die Ausnahme.
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Winter, Florian. "MES-System mit Fertigungskommunikation." Zeitschrift für wirtschaftlichen Fabrikbetrieb 116, no. 6 (2021): 407–9. http://dx.doi.org/10.1515/zwf-2021-0084.

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Abstract In einem vom Bundesministerium für Wirtschaft und Energie (BMWi) geförderten Forschungsprojekt entwickeln die ATS Elektronik GmbH, das Institut für Fertigungstechnik und Werkzeugmaschinen (IFW) der Leibniz-Universität Hannover und die FAUSER AG Lokalisierungs- und Kommunikationsfunktionen für das Manufacturing Execution System der Zukunft. Das Projekt soll zum Jahresende 2021 abgeschlossen sein.
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Dissertations / Theses on the topic "Universität Hannover"

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Hessel, Dirk [Verfasser]. "Punktcrushieren keramisch gebundener Diamantschleifscheiben / Universität Hannover, IFW Institut für Fertigungstechnik und Werkzeugmaschinen. Dirk Hessel." Hannover : PZH, Produktionstechn. Zentrum, 2003. http://d-nb.info/973340622/34.

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Steinebach, Mario, Alexander Friebel, Christine Häckel-Riffler, et al. "TU-Spektrum 1/2005, Magazin der Technischen Universität Chemnitz." Universitätsbibliothek Chemnitz, 2005. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200500470.

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Steinebach, Mario, and Katharina Thehos. "Newsletter für Freunde, Absolventen und Ehemalige der Technischen Universität Chemnitz 1/2012." Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-84503.

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Steinebach, Mario, Katharina Thehos, Christine Häckel-Riffler, et al. "TU-Spektrum 1/2010, Magazin der Technischen Universität Chemnitz." Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000317.

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Steinebach, Mario, and Katharina Thehos. "Newsletter für Freunde, Absolventen und Ehemalige der Technischen Universität Chemnitz 1/2009." Universitätsbibliothek Chemnitz, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200900651.

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Steinebach, Mario, Katharina Thehos, Christine Häckel-Riffler, et al. "TU-Spektrum 1/2009, Magazin der Technischen Universität Chemnitz." Universitätsbibliothek Chemnitz, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200900644.

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Sprink, Thorben [Verfasser]. "SPO11 dependent initiation of meiotic double strand breaks in Arabidopsis thaliana / Thorben Sprink. Julius Kühn-Institut. Gottfried Wilhelm Leibniz Universität Hannover." Quedlinburg : Julius Kühn-Institut, 2015. http://d-nb.info/1105490882/34.

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Seifert, Jennifer [Verfasser]. "(De)Thematisierung von Geschlechtlichkeit in der beruflichen Sozialisation : eine kritische Diskursanalyse am Beispiel der Lehramtsstudierenden der Leibniz Universität Hannover / Jennifer Seifert." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2020. http://d-nb.info/1219652199/34.

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Hertweck, Sasia Mareike [Verfasser], Michael [Akademischer Betreuer] Schmidt, Michael [Gutachter] Schmidt, and Leibniz Universität Hannover Ludger [Gutachter] Overmeyer. "Zeitliche Pulsformung in der Lasermikromaterialbearbeitung – Grundlegende Untersuchungen und Anwendungen / Sasia Mareike Hertweck ; Gutachter: Michael Schmidt; Ludger Overmeyer, Leibniz Universität Hannover ; Betreuer: Michael Schmidt." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2017. http://d-nb.info/1175626295/34.

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Steinebach, Mario, and Katharina Thehos. "Newsletter für Freunde, Absolventen und Ehemalige der Technischen Universität Chemnitz 1/2010." Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000296.

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Books on the topic "Universität Hannover"

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Seidel, Rita. Festschrift zum 175-jährigen Bestehen der Universität Hannover. Olms, 2006.

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Herbert, Mundhenke, and Technische Hochschule Hannover, eds. Die Matrikel der Höheren Gewerbeschule, der Polytechnischen Schule und der Technischen Hochschule zu Hannover. A. Lax, 1988.

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Jörg, Schröder. City makers: Bologna and Emilia linear city : based on study projects at the Faculty of Architecture and Landscape, Leibniz University Hannover. Regionales Bauen und Siedlungsplanung, Leibniz Universität Hannover, 2019.

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Elmar, Mittler, Glitsch Silke, and Rohmann Ivonne, eds. "Eine Welt allein ist nicht genug": Grossbritannien, Hannover und Göttingen 1714-1837. Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2005.

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Pietsch, Wolfgang. Ausbaustand der Universität: Dokumentation zur Gesamtbauplanung. Präsident der Universität Hannover, 1987.

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1938-, Auffarth Sid, Pietsch Wolfgang, and Universität Hannover Präsidium, eds. Die Universität Hannover: Ihre Bauten, ihre Gärten, ihre Planungsgeschichte. Imhof, 2003.

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Wehrhahn, Matthias. Bibliographie des Seminars für deutsche Literatur und Sprache an der Universität Hannover. Revonnah, 1995.

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Claus, Füllberg-Stolberg, and Görling Reinhold, eds. Amerika, das andere Gesicht Europas?: Beiträge einer interdisziplinären Vortragsreihe an der Universität Hannover. Centaurus, 1996.

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Ebeling, Wolfgang. Complex and Differential Geometry: Conference held at Leibniz Universität Hannover, September 14 – 18, 2009. Springer-Verlag Berlin Heidelberg, 2011.

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Deutsche Gesellschaft für Kartographie. Kommission Geoinformation und Visualisierung and Universität Hannover. Institut für Kartographie und Geoinformatik, eds. Visualisierung und Erschliessung von Geodaten: Seminar GEOVIS 2003 26. bis 27. Februar 2003, Universität Hannover. Kirschbaum Verlag, 2003.

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Book chapters on the topic "Universität Hannover"

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Vo Thi, My Hanh, Sophia Rust, Julia Schulze, and Reinhard Hochmuth. "Das Lernzentrum Mathematikdidaktik der Leibniz Universität Hannover." In Konzepte und Studien zur Hochschuldidaktik und Lehrerbildung Mathematik. Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-662-64833-9_26.

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Gerhardt, Dörte. "Rechtsinformatik und computerunterstützte Lehre an der Universität Hannover: Der EULISP Virtual Classroom." In E-Learning im Hochschulverbund. Deutscher Universitätsverlag, 2004. http://dx.doi.org/10.1007/978-3-322-81235-3_12.

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Nissen, Volker, Bruno Klauk, Thomas Deelmann, and Michael Mohe. "Fachhochschule Hannover – University of Applied Science." In Studienführer Consulting. Springer Fachmedien Wiesbaden, 2012. http://dx.doi.org/10.1007/978-3-8349-4466-5_20.

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Jager, Markus. "Von der Dozentur zur Rektoratswürde. Kunstgeschichte und Kunsthistoriker an der TH Hannover – Chronik der ersten Jahrzehnte." In Kunstgeschichte an Polytechnischen Instituten, Technischen Hochschulen und Technischen Universitäten. Böhlau Verlag, 2021. http://dx.doi.org/10.7767/9783205209164.191.

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Wurst, Johanna, Daniel Rosemann, Iryna Mozgova, and Roland Lachmayer. "Concept and Implementation of a Student Design Project for the Development of Sustainable Products." In Lecture Notes in Mechanical Engineering. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-28839-5_88.

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AbstractTechnology is a major driver for leveraging the potential of multidimensional sustainable development, regardless of the sector examined. Therefore, engineers have an important contribution in developing innovative technical solutions to ensure more sustainable alternatives to conventional processes or products. In order to support this comprehension from an early age on, it is the task of lecturers at universities by developing students access to sustainable engineering activities with new teaching programs. Regarding conventional product development, the question arises how sustainable products can be developed, which concepts for design and which methods for validation and quantification can be used. These and further questions are the basis of the project-based learning (PBL) approach introduced in this paper as part of a new module "Development of Sustainable Products" at the Faculty of Mechanical Engineering at the Leibniz University Hannover. In this paper, the need for new courses in the ecological sustainability context and the requirements for student project work are presented. The concept of the project and the overall objective, that the students are required to assess the ecological environmental impact of electric toothbrushes over the entire product life cycle based on a life cycle assessment (LCA) is introduced. After successfully participating in this project, students are able to conduct ecological sustainability analyses and understand the complexity within the development of sustainable products.
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"Vorlesung Universität Hannover Sommersemester 1993." In Gewalt und Politik. Studien zu Nationalsozialismus und totaler Herrschaft, edited by Peter Schyga. Nomos, 2014. http://dx.doi.org/10.5771/9783845254425-361.

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"China-Kompetenz an der Leibniz Universität Hannover." In Forschungszusammenarbeit China-Deutschland. transcript-Verlag, 2020. http://dx.doi.org/10.14361/9783839449073-017.

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Stroth, Maria. "China-Kompetenz an der Leibniz Universität Hannover." In Forschungszusammenarbeit China-Deutschland. transcript Verlag, 2020. http://dx.doi.org/10.1515/9783839449073-017.

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Seifert, Heidi, Carolin Hagemeier, and Anja Binanzer. "Sprachlich heterogene Schüler*innen, fachlich heterogene Lehramtsstudierende – mit E-Learning für sprachliche Vielfalt qualifizieren." In Diversität Digital Denken – The Wider View. Eine Tagung des Zentrums für Lehrerbildung der Westfälischen Wilhelms-Universität Münster vom 08. bis 10.09.2021. WTM-Verlag, 2022. http://dx.doi.org/10.37626/ga9783959871785.0.50.

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In der hybriden Lehrveranstaltung ‚Schule der Vielfalt – Deutsch als Zweitsprache und sprachliche Bildung‘ werden an der Leibniz Universität Hannover (LUH) Lehramtsstudierenden aller Unterrichtsfächer grundlegende Kompetenzen im Bereich Sprachbildung und Deutsch als Zweitsprache vermittelt. Der Beitrag diskutiert die Konzeption des entwickelten E-Learning-Angebots unter der Fragestellung, welche Möglichkeiten Blended-Learning-Formate für die fächerübergreifende Professionalisierung angehender Lehrkräfte eröffnen.
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Meißner, Doris. "Achtsamkeit in der Lehrkräftebildung. Das Potenzial eines Online-Achtsamkeitstrainings für die Persönlichkeitsentwicklung." In Persönlichkeitsbildung in Zeiten von Digitalisierung. Verlag Julius Klinkhardt, 2024. http://dx.doi.org/10.35468/6073-12.

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Der vorliegende Artikel skizziert den Aufbau eines online angeleiteten Achtsamkeitstrainings für Lehramtsstudierende und zeigt den Beitrag dieser Lehrveranstaltung als einen Weg zur Persönlichkeitsentwicklung von angehenden Lehrerinnen und Lehrern auf. In diesem Training an der Leibniz Universität Hannover (LUH) konnten Lehramtsstudierende eine achtsame, ressourcenorientierte Haltung im Umgang mit Stress entwickeln. Durch verschiedene Achtsamkeitsübungen lernten die Teilnehmenden, automatisierte Handlungen und Denkschemata zu erkennen. Sie konnten dadurch einen neuen Umgang mit eigenen Stressoren finden. Damit kultivierten sie eine Basis für eine gute Beziehungsgestaltung im Klassenraum. Der Beitrag greift begünstigende Faktoren für den Lernerfolg in dieser OnlineLehrveranstaltung aus den Ergebnissen qualitativer Analysen heraus. Näher betrachtet wird dabei ein im Training eingesetztes Dialogformat aus dem Achtsamkeitsansatz. Dieses Format wird hinsichtlich seines Potenzials zur Förderung von Kommunikationskompetenz1 als Teil der Persönlichkeitsentwicklung beschrieben. (DIPF/Orig.)
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Conference papers on the topic "Universität Hannover"

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Gatzen, Hans-Heinrich, and Christine Ruffert. "A6.4 - Magnetic Micro Sensor Activities at the Leibniz Universität Hannover." In SENSOR+TEST Conferences 2009. AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2009. http://dx.doi.org/10.5162/sensor09/v2/a6.4.

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Hartung, Andreas, Hans-Peter Hackenberg, Malte Krack, Johann Gross, Torsten Heinze, and Lars Panning-von Scheidt. "Rig and Engine Validation of the Non-Linear Forced Response Analysis Performed by the Tool OrAgL." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75186.

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Since the first non-linear forced response validation of frictionally coupled bladed disks, more than 20 years have passed, and numerous incremental modeling and simulation refinements were proposed. With the present work, we intend to assess how much we have improved since then. To this end, we present findings of an exhaustive validation campaign designed to systematically validate the non-linear vibration prediction for the different friction joints at blade roots, interlocked shrouds and under-platform dampers. An original approach for the identification of crucial contact properties is developed. By using the Dynamic Lagrangian contact formulation and a refined spatial contact discretization, it is demonstrated that the delicate identification of contact stiffness properties can be circumvented. The friction coefficient is measured in a separate test, and determined as unique function of temperature, preload, wear state. Rotating rig and engine measurements are compared against simulations with the tool OrAgL, developed jointly by the Leibniz Universität Hannover and the University of Stuttgart, in which state of the art Component Mode Synthesis and Harmonic Balance methods are implemented.
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Wangenheim, Matthias, Sarah Engelmann, and Frank Haupt. "Better Learning Success in Engineering Mechanics." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50377.

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Studying engineering mechanics is mandatory for every engineering student at Leibniz Universität Hannover (LUH). The course is divided into four parts (statics, elastostatics, kinetics and kinematics, dynamics) and is taught over a period of two years at the very beginning of each study program. While students’ evaluations of our courses are good in general, we face a high failure rate in the exams, which are written once at the end of each course. In later stages of the engineering study programs, it seems hard to for us enthusing students for our research topics. Thus, finding M.Sc. or PhD students is more difficult for us than it should be. In a university funded, internal 12-month project we aim to optimize our Engineering Mechanics Tutorials, which provide a specific, relatively interactive form of teaching to the students. With internal and external consultancy by professional lecturers and didactics trainers, our project team has developed a course of actions and measures to raise the academic success of our students. In this publication we will discuss these actions as well as ways to measure and verify their success.
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Henneberg, Joshua, Peter Schaumann, and Alexander Raba. "Axially loaded grouted connections in offshore conditions using ordinary portland cement." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.6944.

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A grouted connection (GC) is a hybrid connection which joins two telescoped steel tubes by filling the annulus between the steel tubes with grout. GCs are frequently used to enable a force fitted connection between piles and substructure of offshore wind turbines. At latticed substructures this connection is located at mudline level in wet ambient conditions (AC). Nowadays special grout materials are used to achieve not only best mechanical properties but also a good performance during grouting in offshore conditions.To reduce production costs the use of ordinary portland cement (OPC) is investigated as an alternative filling material within this paper. OPC has a much lower tendency to segregate, as there are no aggregates added. This leads to more simplified, stable and cheaper production processes offshore. Further focus is put on the failure mode of OPC filled GCs in submerged condtions.For an appropriate use of OPC offshore a feasible mechanical performance needs to be ensured. Investigating this, small and large-scale laboratory tests were performed at Leibniz Universität Hannover. Using the experimental test setup of previous investigations for special high performance grouts (HPG) [1, 2], enables a direct comparison of HPG and OPC. Documenting liquid and solid OPC properties, like slump flow and compressive strength confirms a stable material quality. Small-scale ULS-tests showed significantly lower ULS-capacities and a more brittle failing process compared to HPG. Lagre-scale tests confirmed the observed failure mechanisms of Schaumann and Raba for OPC filled GCs in submerged conditions [3]. Carried out tests showed significant influence of grout material and confirmed influence of grout annulus size on fatigue capacity.
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Schaumann, Peter, Alexander Raba, and Anne Bechtel. "Impact of Water on the Fatigue Performance of Large-Scale Grouted Connection Tests." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54823.

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Grouted connections represent a common joining technique between substructure and foundation piles of offshore oil & gas platforms as well as of offshore wind turbines. Due to cyclic loads arising from wind and wave actions the fatigue performance of the connection has to be considered. In lattice substructures like jackets the grouted connections are located at seabed level being fully submerged during their entire lifetime. Today’s fatigue design regulations are based on investigations neglecting any influence of the surrounding water since they were conducted in dry ambient conditions. So far, only Germanischer Lloyd gives additional recommendations for submerged grouted connections. At the Institute for Steel Construction, Leibniz Universität Hannover, Germany investigations of the joint research project ‘GROWup’ focus on the fatigue performance of axially loaded grouted connections. The project is funded by the Federal Ministry for Economic Affairs and Energy (BMWi, funding sign: 0325290) and is the third project in a row dealing with grouted connections. As part of this research project, cyclic loading tests on small-scale and large-scale grouted connections with shear keys are conducted. Small-scale fatigue tests showed a reduced number of endurable load cycles for connections when tested in wet ambient conditions. However, the transferability of these findings to a larger scale was still doubtful due to unknown scale effects. Therefore, the impact of water on the fatigue performance was tested recently at large-scale grouted connections. Previous to the submerged large-scale grouted connection fatigue tests, similar test specimens were exposed to alternating loads at dry ambient conditions. Comparison of both large-scale test results under wet and dry conditions enable to estimate the influence of water on the fatigue performance of grouted connections. Reflection of the small-scale test results gives hints on the scale effect. Test preparation, test results and design recommendations are presented in the paper.
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Kuhn, Christian, Benedikt Bruns, Jan Fischer, Jörg Gattermann, and Karl-Heinz Elmer. "Development of a New Underwater Piling Noise Mitigation System: Using Hydro Sound Dampers (HSD)." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83707.

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The aim of the recently published climate control by the German Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (BMU) is a reduction of the German greenhouse gas emissions down to 20 % in 2050, compared to the generated greenhouse gas in 1990. To reach the given target a huge growth in renewable energy is necessary. One of the most potential possibilities to produce renewable energy in Germany will be the installation of offshore wind turbines. During the installation of offshore wind foundations such as monopiles, tripods, tripiles and jackets, mostly large tubular steel piles are impact driven to final penetration depth. In the process of impact driving, considerable underwater sound emissions will appear. In recent times, peak sound pressure levels above 190 dB re 1 μPa have been measured at a distance of 750 m away from the installation ground. These peak sound pressure levels, produced during the installation of any kind of driven offshore foundation, is potentially harmful to marine life, in particular to marine mammals such as harbor porpoises, harbor seals or grey seals. To protect the marine life the German Federal Maritime and Hydrographic Agency (BSH) set the maximum allowed underwater sound pressure level to 160 dB (SEL) at a distance of 750 m away from pile driving. To reach the given target by the BSH a new underwater piling noise mitigation system using so called hydro sound dampers (HSD) is presently developed at the Institute for Soil Mechanics and Foundation Engineering at the Technische Universität in Braunschweig (IGB-TUBS). After small scale tests in the so called ‘large wave channel’ in Hannover a full scale test was performed in the Baltic-Sea some weeks ago. The results of the measurements are very promising, as a reduction of 12 up to 20 dB could be generated. Besides existing noise mitigation systems one of the main advantage of the hydro sound dampers is, that the mitigation can be pre-adjusted to a predefined frequency range, as marine mammals are sensitive only for a certain sound frequency range. In this paper, the results of the small and large scale tests and some new research findings concerning the shape and the material of the hydro sound dampers will be presented.
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Dawidowicz, Karol, Grzegorz Krzan, Radosław Baryła, and Krzysztof Swiatek. "The Impact of GNSS Antenna Mounting during Absolute Field Calibration on Phase Center Correction – JAV_GRANT-G3T Antenna Case Study." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.183.

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The phase center corrections (PCC) of an GNSS antenna can be precisely determined using the absolute field calibration procedure with a precise robot. Using the Hannover’s automated absolute antenna field calibration technique developed by the Institute of Geodesy (University of Hannover) and Geo++ we demonstrate that the way of antenna mounting on the robot (distance from mechanical structures mounted underneath the antennas) can cause significant changes in the phase center offset and variations. For both the GPS and the GLONASS carrier signals L1 and L2 these changes are in the order of several millimeters. e also analyzed how these changes transfer to the coordinate domain. We investigated the differences between position estimates obtained using two different, individual and type-mean, elevation dependent PCC. There days of GNSS observations on very short baseline were used for these studies. The position time-series were derived using the RTKLib software package. We found that that the differences in the calibrations models propagate directly into the position domain, affecting sub-daily results and giving visible periodic variations in solutions. The best agreement with the “true position” we obtained using PCC from the individual calibrations.
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Krawinkel, Thomas, Steffen Schon, and Andreas Bauch. "Recent and Future Activities at Leibniz University Hannover in GNSS Frequency Transfer." In 2021 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS). IEEE, 2021. http://dx.doi.org/10.1109/eftf/ifcs52194.2021.9604309.

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Nacke, Bernard. "Recent research and developments in induction heating at the Institute of Electrotechnology of Leibniz University Hannover." In 2008 Third International Forum on Strategic Technologies (IFOST). IEEE, 2008. http://dx.doi.org/10.1109/ifost.2008.4602967.

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Косян, Рубен, Ruben Kosyan, Marina Krylenko, and Marina Krylenko. "METHODOLOGICAL ASPECTS OF THE SUSPENDED SEDIMENT CONCENTRATION MEASUREMENT IN THE COASTAL ZONE." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b938191a948.03638731.

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Results of the suspended sediment concentration study in the coastal zone on the basis of field and laboratory experiments are analyzed. Data from field experiments, performed in the coastal zone of the North, Mediterranean and Black seas, are used. The laboratory researches were fulfilled in the Big Wave Channel of the Hannover University. It is shown that to increase the accuracy of measurement it is necessary to take into account the convective mechanism of the sediment suspension, as well as the size, the direction of the rotation axis and other parameters of the turbulent vortices transporting sand sediments. The presented information will help to improve the quality of field data collection.
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