TY - CHAP A1 - Alber, Oliver A1 - Ehehalt, Ulrich A1 - Markert, Richard A1 - Wegener, Georg ED - Awrejcewicz, Jan T1 - Experimental observations on rotor-to-stator contact T2 - Vibration, Control and Stability of Dynamical Systems N2 - If a flexible rotor contacts its stator, the nonlinearities induced by contact may result in a great variety of vibration phenomena. This article presents experimental results gained at test rigs. Fundamental phenomena are analyzed and discussed. First, a modular kit for rotordynamic experiments is described. The kit allows customizing the properties of rotor and stator that are relevant for the dynamic behavior. The system allows to specify target values for natural frequencies, modal damping, clearance width, contact fric- tion and others. Basic con� gurations based on this kit were used to study the in uence of mass, sti� ness and damping of both rotor and stator, contact fric- tion and misalignment of the stator on the vibration of the rotor-stator system. Extensions of the kit allowed the experimental investigation of systems with a multitude of natural frequencies, highly exible stators and even drop down and overload incidents of rotors supported by active magnetic bearings. The article also analyzes and explains the various vibration phenomena resulting from contact. In particular, resonance diagrams from run-up and run-down processes, orbit plots and frequency spectra are utilized to discuss the dynamic characteristics. The motion types encountered include not only rotor syn- chronous motions, but also multi frequency motions (forward and backward whirl), sub- and super-harmonic motions, motions including sidebands as well as chaotic motions. Emphasis is put on sensitive system parameters and on existence and stability of the various types of motion. KW - Rotor, Maschine KW - Ständer, Technik Y1 - 2017 SN - 978-83-935312-5-7 SP - 9 EP - 24 PB - DSTA CY - Lodz, Poland ER - TY - CHAP A1 - Jost, Thomas T1 - Geldpolitik, Preisniveaustabilität und Finanzstabilität, Koreferat zu Albrecht Michler und Franz Seitz BT - Ordnungsdefizite und Lösungsansätze T2 - Wirtschaftspolitik im Wandel KW - Geldpolitik KW - Preisniveau, Europäische Zentralbank, Geldpolitische Ziele KW - Preisstabilität Y1 - 2018 SN - 978-3-11-055486-1 SP - 205 EP - 209 PB - De Gruyter CY - Oldenbourg ER - TY - GEN A1 - Kück, Nico-Wei T1 - In Vitro Platform for Acoustic and Electrophysiological Investigations of Ultrasound Neuromodulation N2 - The quality of life has increased dramatically over the past decades. Approximately one billion individuals worldwide will be aged 65 years or older by 2030. With the increasing age of human population, prevalence of neurodegenerative ailments, such as Parkinson’s disease or Alzheimer’s disease, increases. Brain pacemakers are proposed to treat their symptoms. They provide the electrical stimulation of neuronal regions of the central or peripheral nervous system. But for the implantation of brain pacemakers, surgery is needed. Those surgical interventions can be avoided by using transcranial stimulation methods such as Transcranial Magnetic Stimulation (TMS). However, magnetic fields lack the possibility of focusing. Ultrasound (US) offers transcranial characteristics as well and allows focusing on a specific target area in the brain. Over 60 years ago, the Hodgkin-Huxley (H-H) model was presented to simulate the electrophysiological activity of neurons but it lacks to describe the impact of mechanical soundwaves on action potentials in a neuron. N2 - Poster KW - In Vitro, Ultrasound, Neuromodulation, Neuron KW - Nervenstimulation KW - Ultraschall Y1 - 2017 ER - TY - CHAP A1 - Reuter, Rebecca A1 - Hauser, Florian A1 - Gold-Veerkamp, Carolin A1 - Stark, Theresa A1 - Kis, Juliane A1 - Mottok, Jürgen A1 - Abke, Jörg A1 - Meyer, Dany T1 - Towards the Construction of a Questionnaire for the Identification of Learning Obstacles T2 - 2018 IEEE Global Engineering Education Conference (EDUCON) KW - Hochschuldidaktik KW - Fragebogen Y1 - 2018 SP - 463 EP - 472 PB - IEEE ER - TY - CHAP A1 - Gold-Veerkamp, Carolin T1 - Using Grounded Theory Methodology to Discover Undergraduates’ Preconceptions of Software Engineering KW - Software Engineering KW - Grounded theory Y1 - 2018 SP - 713 EP - 717 PB - IEEE ER - TY - THES A1 - Daus, Andreas T1 - Zellbasierte Biosensoren – Hybride Systeme aus dreidimensionalen in vitro Netzwerken und Mikroelektroden Arrays N2 - Mit der Entwicklung hybrider Strukturen aus Mikroelektroden Arrays und dreidimensionalen Sphäroiden wurde in dieser Arbeit ein funktionaler, deskriptiver Ansatz der Biosensorik adressiert. Während biochemische Sensoren ausschließlich analytische Informationen über die Wechselwirkung von Liganden und Rezeptoren liefern, erlauben zellbasierte Biosensoren eine physiologische Beschreibung biologischer Systeme in nativen bzw. chemisch oder physikalisch provozierten Zuständen. Dies impliziert für Anwendungen der Pharmakologie, Toxikologie und Grundlagenforschung hohes Potenzial, evoziert jedoch eine multidisziplinäre Aufgabe. Es werden zum einen in vitro Systeme benötigt, die den Ansprüchen eines physiologisch repräsentativen Abbilds eines Organismus genügen. Zum anderen sind technische Systeme erforderlich, die Zellreaktionen qualitativ und quantitativ verwertbar machen. KW - Array KW - Biosensor Y1 - 2013 ER - TY - THES A1 - Frieß, Johannes T1 - Einfluss ionisierender Strahlung auf die elektrophysiologischen Eigenschaften kardialer Zellen N2 - Die zentrale Fragestellung der Strahlenbiologie behandelt die Wirkung von ionisierender Strahlung auf biologische Systeme. Zwar sind die bei Exposition mit ionisierender Strahlung entstehenden Gesundheitsrisiken bekannt, dennoch sind die Strahlungseffekte auf das Herz immer noch nicht sehr gut verstanden. Dabei ist die Exposition mit hohen Dosen ionisierender Strahlung ein anerkannter Risikofaktor in Bezug auf kardiovaskuläre Erkrankungen. KW - Elektrophysiologie KW - Herzmuskelzelle Y1 - 2016 ER - TY - JOUR A1 - Emmerich, Florian A1 - Thielemann, Christiane T1 - Real-space measurement of potential distribution in PECVD ONO electrets by Kelvin probe force microscopy JF - Nanotechnology N2 - Multilayers of silicon oxide/silicon nitride/silicon oxide (ONO) are known for their good electret properties due to deep energy traps near the material interfaces, facilitating charge storage. However, measurement of the space charge distribution in such multilayers is a challenge for conventional methods if layer thickness dimensions shrink below 1 μm. In this paper, we propose an atomic force microscope based method to determine charge distributions in ONO layers with spatial resolution below 100 nm. By applying Kelvin probe force microscopy (KPFM) on freshly cleaved, corona-charged multilayers, the surface potential is measured directly along the z-axis and across the interfaces. This new method gives insights into charge distribution and charge movement in inorganic electrets with a high spatial resolution. KW - electret, multilayer, charge distribution, Kelvin probe force microscopy KW - Kelvin-Sonde KW - Rasterkraftmikroskopie Y1 - 2016 VL - 2016 IS - 27 SP - 1 EP - 10 ER - TY - GEN A1 - Kaps, Rolf Ulrich T1 - Caps : die Career Position Score zur Vergleichbarmachung von Positionen in unterschiedlichen Hierarchien N2 - Angesichts der starken Effekte, die eine von der allgemeinen bzw. vorgeschriebenen Vorgehensweise abweichende Zuordnung der Hierarchiestufen zu den Management-ebenen haben kann, wäre ein Instrument wünschenswert, dass zumindest Indizien für eine solche abweichende Vorgehensweise liefern kann. Im vorliegenden Beitrag werden entsprechende Kennzahlen entworfen und deren Tauglichkeit diskutiert. KW - Betriebliche Kennzahl Y1 - 2016 ER - TY - GEN A1 - Kaps, Rolf Ulrich T1 - Fluktuationskennzahlen und die liebe Mathematik N2 - Der vorliegende Beitrag widmet sich einem in der Literatur wenig diskutiertem Aspekt: der Tauglichkeit verschiedener Berechnungsweisen von Fluktuationskennzahlen, d. h. vor allem unter Betrachtung mathematischer Gesichtspunkte. Dazu werden vier unterschiedliche Berechnungsweisen betrachtet: 1) die Basisformel, 2) die Schlüter-Formel, 3) die ZVEI-Formel und 4) die BDA-Formel. KW - Personalkennzahl Y1 - 2016 ER - TY - JOUR A1 - Jost, Thomas T1 - Fehlentwicklungen: Hausaufgaben für die Schuldnerländer JF - Euro am Sonntag KW - Eurozone, Reformen, Europäischer Währungsfonds KW - Eurozone Y1 - 2017 ER - TY - CHAP A1 - Reuter, Rebecca A1 - Hauser, Florian A1 - Gold-Veerkamp, Carolin A1 - Mottok, Jürgen A1 - Abke, Jörg T1 - Towards a Definition and Identification of Learning Obstacles in Higher Software Engineering Education T2 - EDULEARN17 Proceedings KW - Hochschuldidaktik KW - Software Engineering Y1 - 2017 SN - 978-84-697-3777-4 SN - 2340-1117 SP - 10259 EP - 10267 ER - TY - CHAP A1 - Borgeest, Kai A1 - Höfer, Patrik A1 - Seubert, Michael A1 - Stein, Simon T1 - Model Based EGR Control T2 - Proceedings of the Fev Diesel Powertrains 3.0, July 11th & 12th 2017 N2 - Almost stationary control of the correct EGR rate (Exhaust Gas Recirculation) is state of the art. More aggressive emission tests such as WLTP and RDE require a dynamic control of the EGR rate, otherwise a too low EGR rate results in increased NOx emissions, a too high EGR rate in particulate emissions. The difficulty in any EGR control is the missing plant knowledge; the EGR rate is controlled although the present EGR rate is not exactly known. EGR flow sensors are available, but due to additional costs they have not found a broad acceptance. A different approach for high pressure EGR investigated in this paper is a control using a second lambda sensor between EGR and inlet valves. This approach improves the dynamic response, but it might come with costs similar to an EGR flow sensor. Alternatively a model based approach can be used which shows high potential. KW - Exhaust Gas Recirculation KW - Abgasrückführung Y1 - 2017 SP - 64 EP - 66 PB - FEV CY - Aachen ER - TY - BOOK A1 - Mann, Michael T1 - Der Einfluss veränderlicher Erdbodenparameter auf das Ausbreitungsverhalten elektromagnetischer Felder niederer Frequenzen T1 - The Influence of Varying Soil Parameters on the Propagation of Electromagnetic Waves of Low Frequencies N2 - Im Rahmen der Einführung des weltweiten Digitalrundfunks (Digital Radio Mondiale) im Frequenzbereich der Langwelle, Mittelwelle und Kurzwelle interessiert für Lang- und Mittelwelle der Einfluss veränderlicher Parameter des Erdbodens auf das abgestrahlte Signal. Zur Funknetzplanung werden die im “World Atlas of Ground Conductivities” aufgeführten Bodenleitfähigkeitskarten der International Telecommunication Union (ITU) herangezogen, die jedoch nur einen groben Überblick über die Verhältnisse geben. In dieser Arbeit soll untersucht werden, ob die Karten der Bodenleitfähigkeit in ihrer Ortsauflösung genügend genau dargestellt sind und ob gegebenenfalls durch die Anwendung alternativer Verfahren genauere Karten erstellt werden können. Weiterhin sind unterschiedliche Verfahren zur Messung der Bodenleitfähigkeit bezüglich ihrer Anwendbarkeit zu beurteilen. N2 - With respect to the introduction of the worldwide digital radio broadcast service (DRM) at low and medium frequencies (MF), significant interest has to be paid to the influence of variable parameters of the soil towards the transmitted signal. Network Planners utilize ground conductivity maps provided by the “World Atlas of Ground Conductivities” by the International Telecommunication Union (ITU). The current version of these maps may not grant more than a coarse view on the situation. This contribution shall determine whether ground conductivity maps show sufficient detail or whether maps with more detail may be produced by applying alternative procedures of ground conductivity measurement. Furthermore, the standard procedures of ground conductivity measurement are to be rated with respect to their applicability in the medium frequency range. N2 - Dissertation KW - Bodenleitfähigkeit KW - Boden KW - Elektromagnetische Welle KW - Leitfähigkeit KW - Niederfrequenz KW - DRM (Rundfunktechnik) Y1 - 2006 SN - 978-3-939432-28-9 N1 - Zugl.: Kaiserslautern, Techn. Univ., Diss., 2006 VL - 2006 PB - Lehrstuhl für Hochspannungstechnik und Elektromagnetische Verträglichkeit, Univ. CY - Kaiserslautern ER - TY - BOOK A1 - Borgeest, Kai T1 - Manipulation von Abgaswerten N2 - Dieses kleine Buch stellt Hintergründe zum Abgasskandal dar, z. B. welche Schadstoffe kritisch sind, wie Motorsteuergeräte, Abgasrückführung und Abgasnachbehandlung funktionieren, wie Manipulationen auf dem Prüfstand möglich sind, mit welchen Fahrzyklen getestet wird und in welchem rechtlichen und politischen Umfeld dies lange Zeit unbemerkt mit unterschiedlichen Konsequenzen in der EU und den USA geschehen konnte. Es werden Maßnahmen vorgestellt, mit denen Fahrzeuge auch real gesetzliche Grenzwerte einhalten können und wie Manipulationen zukünftig rechtlich und politisch verhindert werden können. Dem Leser werden durch Literaturhinweise zusätzliche Details erschlossen. KW - Abgasemmission KW - Grenzwert KW - Kraftfahrzeugelektronik KW - Abgase KW - Steuergerät KW - Abgasskandal KW - Abgasrückführung KW - Abschaltfunktion KW - Manipulation KW - Messung KW - Wirtschaftskriminalität Y1 - 2017 SN - 978-3-658-17180-3 PB - Springer-Vieweg CY - Wiesbaden ER - TY - JOUR A1 - Reuter, Carsten A1 - Foerstl, Kai A1 - Hartmann, Evi A1 - Blome, Constantin T1 - Sustainable Global Supplier Management: The Role of Dynamic Capabilities in Achieving Competitive Advantage JF - Journal of Supply Chain Management N2 - Organizations face increased pressure from stakeholders to incorporate a plethora of corporate responsibility (CR) and sustainability aspects in their business practices. Legal and extra-legal demands are dynamically changing; almost no organizational function is unaffected. Owing to the outsourcing wave of the last decade, in particular purchasing and supply management (PSM) plays an ever more important role in assuring sustainable production of the firm’s products offered in the marketplace. The supply base of many Western firms has become increasingly global and spend volumes have shifted towards emerging countries. In order to avoid the risk of reputational damage to the buying company, the PSM department must ensure that their international suppliers comply with their corporate codes of conduct and that environmental and social misconduct at supplier premises does not occur. In this paper, ‘‘sustainability’’ refers to the pursuit of the tripartite of economic, environmental, and social performance.We contribute to prior research in the fields of sustainability and CR by extending insights of the dynamic capabilities view to analyze how the PSM function integrates sustainability aspects in its global supplier management processes. Based on four case studies in the chemical industry, we propose that profound sustainable global supplier management (SGSM) capabilities are a source of competitive advantage. These capabilities are path dependent and particularly valuable when organizations are receptive to external stakeholder pressure. Early movers in the field of SGSM reap competitive benefits to a notable extent as a result of resource accumulation and learning processes over time. KW - Sustainability KW - corporate responsibility KW - Case Research KW - Nachhaltigkeit KW - Corporate Social Responsibility Y1 - 2010 VL - 46 IS - 2 SP - 45 EP - 63 ER - TY - CHAP A1 - Reuter, Carsten T1 - Understanding Directed Sourcing in Triadic Supply Networks N2 - Firms experience that an increasingly complex supply base is a costly investment. In order to keep specialized suppliers but to reduce the effort of managing it, OEMs contract second-tier firms and direct them to first-tier suppliers. We conduct four embedded case studies in the international automotive industry to record types and possible motivations of directed sourcing. Our findings show that directed sourcing triads may be set up to achieve operational efficiencies but also for strategic reasons such as to gain access to foreign markets. This research contributes to literature on triadic supply chains in general and network buyer-supplier relationships specifically. KW - Directed Sourcing KW - Triadic Supply Networks KW - Case Research KW - Beschaffung KW - Supply Chain Management Y1 - 2017 ER - TY - CHAP A1 - Rücker, Michael T. A1 - Pancratz, Nils A1 - Gold-Veerkamp, Carolin A1 - Pinkwart, Niels A1 - Brinda, Torsten ED - Diethelm, Ira T1 - Workshop zu Alltagsvorstellungen in der Informatik: Erhebungsmethodik und Implikationen für den Unterricht T2 - Informatische Bildung zum Verstehen und Gestalten der digitalen Welt N2 - Ein zentrales Konzept jeder konstruktivistisch geprägten Auffassung von Lernen ist, dass das Vorwissen, die Präkonzepte und ggf. Fehlvorstellungen der Lernenden einen direkten Einfluss auf den Lernprozess haben: sowohl negativ als auch positiv. Speziell für die Informatik gilt, dass Lernende heutzutage von Beginn an in einer Welt aufwachsen, die von informatischen Artefakten und Systemen nahezu vollständig durchdrungen ist. Sie beobachten sie, interagieren mit ihnen und formen so Vorstellungen über ihre Funktionsweisen und Eigenschaften. Sie bilden somit bereits im Alltag und vor dem Beginn jeglicher Schulbildung kohärente Konzeptionen über zentrale Gegenstände und Inhalte der Informatik. Im Rahmen dieses Workshops werden zunächst verschiedene methodische Ansätze und erste Ergebnisse zu Erhebungen solcher Lernervorstellungen vorgestellt. Anschließend sollen diese anhand von drei Leitfragen verglichen und diskutiert werden: Welche Stärken und Schwächen haben die jeweils verwendeten empirischen Methoden bei der Erhebung von Lernervorstellungen in der Informatik? Wie können sie sich ggf. sinnvoll ergänzen? Welche Implikationen haben die erhobenen Vorstellungen für die Unterrichtspraxis? KW - Forschungsmethode KW - Konstruktivismus Y1 - 2017 UR - https://dl.gi.de/bitstream/handle/20.500.12116/4340/paper.pdf?sequence=1&isAllowed=y SN - 978-3-88579-668-8 SP - 393 EP - 401 PB - Köllen Druck+Verlag GmbH CY - Bonn ER - TY - CHAP A1 - Klopp, Marco A1 - Gold-Veerkamp, Carolin A1 - Kuhn, Martina A1 - Abke, Jörg T1 - Can Pair Programming Address Multidimensional Issues in Higher Education? T2 - International Conference on Interactive Collaborative Learning (ICL) N2 - To handle heterogeneity within students, to foster needed generic competencies, to motivate them, and to increase their employability, a didactical method to teach and learn programming in non-major degree programs shall be found. Therefore, this paper covers strategies and the theoretical underpinning concerning these four challenges and gives solutions how to cope with them. Finally, Pair Programming is presented as a method that addresses the issues introduced here. KW - Extreme programming KW - Teamwork Y1 - 2017 UR - https://opus4.kobv.de/opus4-h-ab/frontdoor/index/index/docId/863 SP - 327 EP - 334 PB - Springer ER - TY - CHAP A1 - Stehlikova, Veronika A1 - Probst, Anne-Catherine A1 - Nentvich, Ondrej A1 - Urban, Martin A1 - Inneman, Adolf A1 - Sieger, Ladislav A1 - Marsikova, Veronika A1 - Döhring, Thorsten T1 - Development of iridium coated silicon X-ray mirrors for Lobster Eye astronomical telescopes T2 - Proceedings of EOSMOS 2017 N2 - In the field of X-ray astronomy different types of telescope optics based on grazing incidence mirrors can be used. This contribution presents a special design of a Lobster Eye wide-field telescope with mirrors based on flat silicon wafers and the task of coating such mirror substrates with reflective iridium layers. KW - X-ray KW - mirror KW - telescope KW - Lobster Eye KW - iridium KW - Iridium KW - Röntgenteleskop Y1 - 2017 VL - 2017 IS - EOSMOS 2017 SP - 1 EP - 2 PB - European Optical Society ER - TY - CHAP A1 - Stehlikova, Veronika A1 - Proserpio, Laura A1 - Friedrich, Peter A1 - Madarasz, Emanuel A1 - Breunig, Elias A1 - Burwitz, Vadim A1 - Döhring, Thorsten A1 - Probst, Anne-Catherine T1 - Indirect glass slumping of grazing incidence mirror segments for lightweight x-ray telescopes T2 - Proceedings of the International Society for Optics and Photonics (SPIE) N2 - The paper provides a description of recent progress in the development of lightweight, precision and highthroughput grazing-incidence mirrors for X-ray astronomy made of glass. In particular, the indirect slumping technology under investigation at the Max Planck Institute for Extraterrestrial Physics (MPE) is reviewed and recent activities are presented together with the research approach. The glass slumping technique foresees several steps: a thermal forming process using a suitable mould; a re ective layer application; the alignment and integration of mirror segments into a supporting structure; and the � nal veri� cation of prototype modules using X-rays. Each step is considered at MPE, with the involvement of partner institutes and universities. The last year of activities was mainly dedicated to the procurement of new moulds and to the application of Iridium coating. The main results will be presented. KW - X-ray KW - iridium KW - telescope KW - slumping KW - glass KW - Iridium KW - Röntgenteleskop Y1 - 2017 U6 - https://doi.org/10.1117/12.2272671 VL - 2017 IS - 10399 SP - 103991Z-1 EP - 103991Z-7 PB - SPIE ER - TY - CHAP A1 - Döhring, Thorsten A1 - Probst, Anne-Catherine A1 - Emmerich, Florian A1 - Stollenwerk, Manfred A1 - Stehlikova, Veronika A1 - Friedrich, Peter A1 - Damm, Christine T1 - Development of iridium coated X-ray mirrors for astronomical applications T2 - Proceedings of the International Society for Optics and Photonics (SPIE) N2 - Future space-based X-ray observatories need to be very lightweight for launcher mass constraints. Therefore they will use a reduced mirror thickness, which results in the additional requirement of low coating stress to avoid deformation of the initial precisely shaped mirror substrates. Due to their excellent reflection properties iridium coatings are sometimes applied for grazing incidence mirrors in astronomical X-ray telescopes. At Aschaffenburg University of Applied Sciences the coating of thin iridium films by an RF-magnetron sputtering technique is under development. The work is embedded in collaborations with the Max-Planck-Institute for Extraterrestrial Physics in Germany, the Czech Technical University in Prague, the Osservatorio Astronomico di Brera in Italy, the German Leibniz Institute for Solid State and Materials Research in Dresden, and the French Institute Fresnel. Sputtering with different parameters leads to iridium films with different properties. The current work is focused on the microstructure of the iridium coatings to study the influence of the substrate and of the argon gas pressure on the thin film growing process. Correlations between coating density, surface micro-roughness, the crystalline structure of the iridium layers, and the expected reflectivity of the X-ray mirror as well as coating stress effects are presented and discussed. The final goal of the project is to integrate the produced prototype mirrors into an X-ray telescope module. On a longer timescale measurements of the mirror modules optical performance are planned at the X-ray test facility PANTER. KW - X-ray KW - telescope KW - mirror KW - iridium KW - coating KW - Iridium KW - Röntgenteleskop Y1 - 2017 U6 - https://doi.org/10.1117/12.2273988 VL - 2017 IS - 10399 SP - 103991C-1 EP - 103991C-8 PB - SPIE ER -