@incollection{AlberEhehaltMarkertetal.2017, author = {Alber, Oliver and Ehehalt, Ulrich and Markert, Richard and Wegener, Georg}, title = {Experimental observations on rotor-to-stator contact}, series = {Vibration, Control and Stability of Dynamical Systems}, booktitle = {Vibration, Control and Stability of Dynamical Systems}, editor = {Awrejcewicz, Jan}, publisher = {DSTA}, address = {Lodz, Poland}, isbn = {978-83-935312-5-7}, pages = {9 -- 24}, year = {2017}, abstract = {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.}, language = {en} } @incollection{Jost2018, author = {Jost, Thomas}, title = {Geldpolitik, Preisniveaustabilit{\"a}t und Finanzstabilit{\"a}t, Koreferat zu Albrecht Michler und Franz Seitz}, series = {Wirtschaftspolitik im Wandel}, booktitle = {Wirtschaftspolitik im Wandel}, publisher = {De Gruyter}, address = {Oldenbourg}, isbn = {978-3-11-055486-1}, pages = {205 -- 209}, year = {2018}, subject = {Geldpolitik}, language = {de} } @misc{Kueck2017, author = {K{\"u}ck, Nico-Wei}, title = {In Vitro Platform for Acoustic and Electrophysiological Investigations of Ultrasound Neuromodulation}, year = {2017}, abstract = {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.}, subject = {Nervenstimulation}, language = {en} } @inproceedings{ReuterHauserGoldVeerkampetal.2018, author = {Reuter, Rebecca and Hauser, Florian and Gold-Veerkamp, Carolin and Stark, Theresa and Kis, Juliane and Mottok, J{\"u}rgen and Abke, J{\"o}rg and Meyer, Dany}, title = {Towards the Construction of a Questionnaire for the Identification of Learning Obstacles}, series = {2018 IEEE Global Engineering Education Conference (EDUCON)}, booktitle = {2018 IEEE Global Engineering Education Conference (EDUCON)}, publisher = {IEEE}, pages = {463 -- 472}, year = {2018}, subject = {Hochschuldidaktik}, language = {en} } @inproceedings{GoldVeerkamp2018, author = {Gold-Veerkamp, Carolin}, title = {Using Grounded Theory Methodology to Discover Undergraduates' Preconceptions of Software Engineering}, publisher = {IEEE}, pages = {713 -- 717}, year = {2018}, subject = {Software Engineering}, language = {en} } @phdthesis{Daus2013, author = {Daus, Andreas}, title = {Zellbasierte Biosensoren - Hybride Systeme aus dreidimensionalen in vitro Netzwerken und Mikroelektroden Arrays}, school = {Technische Hochschule Aschaffenburg}, year = {2013}, abstract = {Mit der Entwicklung hybrider Strukturen aus Mikroelektroden Arrays und dreidimensionalen Sph{\"a}roiden wurde in dieser Arbeit ein funktionaler, deskriptiver Ansatz der Biosensorik adressiert. W{\"a}hrend biochemische Sensoren ausschließlich analytische Informationen {\"u}ber die Wechselwirkung von Liganden und Rezeptoren liefern, erlauben zellbasierte Biosensoren eine physiologische Beschreibung biologischer Systeme in nativen bzw. chemisch oder physikalisch provozierten Zust{\"a}nden. Dies impliziert f{\"u}r Anwendungen der Pharmakologie, Toxikologie und Grundlagenforschung hohes Potenzial, evoziert jedoch eine multidisziplin{\"a}re Aufgabe. Es werden zum einen in vitro Systeme ben{\"o}tigt, die den Anspr{\"u}chen eines physiologisch repr{\"a}sentativen Abbilds eines Organismus gen{\"u}gen. Zum anderen sind technische Systeme erforderlich, die Zellreaktionen qualitativ und quantitativ verwertbar machen.}, subject = {Array}, language = {de} } @phdthesis{Friess2016, author = {Frieß, Johannes}, title = {Einfluss ionisierender Strahlung auf die elektrophysiologischen Eigenschaften kardialer Zellen}, school = {Technische Hochschule Aschaffenburg}, year = {2016}, abstract = {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 kardiovaskul{\"a}re Erkrankungen.}, subject = {Elektrophysiologie}, language = {de} } @article{EmmerichThielemann2016, author = {Emmerich, Florian and Thielemann, Christiane}, title = {Real-space measurement of potential distribution in PECVD ONO electrets by Kelvin probe force microscopy}, series = {Nanotechnology}, volume = {2016}, journal = {Nanotechnology}, number = {27}, pages = {1 -- 10}, year = {2016}, abstract = {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.}, subject = {Kelvin-Sonde}, language = {en} } @misc{Kaps2016, author = {Kaps, Rolf Ulrich}, title = {Caps : die Career Position Score zur Vergleichbarmachung von Positionen in unterschiedlichen Hierarchien}, year = {2016}, abstract = {Angesichts der starken Effekte, die eine von der allgemeinen bzw. vorgeschriebenen Vorgehensweise abweichende Zuordnung der Hierarchiestufen zu den Management-ebenen haben kann, w{\"a}re ein Instrument w{\"u}nschenswert, dass zumindest Indizien f{\"u}r eine solche abweichende Vorgehensweise liefern kann. Im vorliegenden Beitrag werden entsprechende Kennzahlen entworfen und deren Tauglichkeit diskutiert.}, subject = {Betriebliche Kennzahl}, language = {de} } @misc{Kaps2016, author = {Kaps, Rolf Ulrich}, title = {Fluktuationskennzahlen und die liebe Mathematik}, year = {2016}, abstract = {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 Schl{\"u}ter-Formel, 3) die ZVEI-Formel und 4) die BDA-Formel.}, subject = {Personalkennzahl}, language = {de} } @article{Jost2017, author = {Jost, Thomas}, title = {Fehlentwicklungen: Hausaufgaben f{\"u}r die Schuldnerl{\"a}nder}, series = {Euro am Sonntag}, journal = {Euro am Sonntag}, pages = {2}, year = {2017}, subject = {Eurozone}, language = {de} } @inproceedings{ReuterHauserGoldVeerkampetal.2017, author = {Reuter, Rebecca and Hauser, Florian and Gold-Veerkamp, Carolin and Mottok, J{\"u}rgen and Abke, J{\"o}rg}, title = {Towards a Definition and Identification of Learning Obstacles in Higher Software Engineering Education}, series = {EDULEARN17 Proceedings}, booktitle = {EDULEARN17 Proceedings}, isbn = {978-84-697-3777-4}, issn = {2340-1117}, pages = {10259 -- 10267}, year = {2017}, subject = {Hochschuldidaktik}, language = {en} } @inproceedings{BorgeestHoeferSeubertetal.2017, author = {Borgeest, Kai and H{\"o}fer, Patrik and Seubert, Michael and Stein, Simon}, title = {Model Based EGR Control}, series = {Proceedings of the Fev Diesel Powertrains 3.0, July 11th \& 12th 2017}, booktitle = {Proceedings of the Fev Diesel Powertrains 3.0, July 11th \& 12th 2017}, publisher = {FEV}, address = {Aachen}, pages = {64 -- 66}, year = {2017}, abstract = {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.}, subject = {Abgasr{\"u}ckf{\"u}hrung}, language = {en} } @book{Mann2006, author = {Mann, Michael}, title = {Der Einfluss ver{\"a}nderlicher Erdbodenparameter auf das Ausbreitungsverhalten elektromagnetischer Felder niederer Frequenzen}, volume = {2006}, publisher = {Lehrstuhl f{\"u}r Hochspannungstechnik und Elektromagnetische Vertr{\"a}glichkeit, Univ.}, address = {Kaiserslautern}, isbn = {978-3-939432-28-9}, pages = {X, 199 S.}, year = {2006}, abstract = {Im Rahmen der Einf{\"u}hrung des weltweiten Digitalrundfunks (Digital Radio Mondiale) im Frequenzbereich der Langwelle, Mittelwelle und Kurzwelle interessiert f{\"u}r Lang- und Mittelwelle der Einfluss ver{\"a}nderlicher Parameter des Erdbodens auf das abgestrahlte Signal. Zur Funknetzplanung werden die im "World Atlas of Ground Conductivities" aufgef{\"u}hrten Bodenleitf{\"a}higkeitskarten der International Telecommunication Union (ITU) herangezogen, die jedoch nur einen groben {\"U}berblick {\"u}ber die Verh{\"a}ltnisse geben. In dieser Arbeit soll untersucht werden, ob die Karten der Bodenleitf{\"a}higkeit in ihrer Ortsaufl{\"o}sung gen{\"u}gend genau dargestellt sind und ob gegebenenfalls durch die Anwendung alternativer Verfahren genauere Karten erstellt werden k{\"o}nnen. Weiterhin sind unterschiedliche Verfahren zur Messung der Bodenleitf{\"a}higkeit bez{\"u}glich ihrer Anwendbarkeit zu beurteilen.}, subject = {Boden}, language = {de} } @book{Borgeest2017, author = {Borgeest, Kai}, title = {Manipulation von Abgaswerten}, publisher = {Springer-Vieweg}, address = {Wiesbaden}, isbn = {978-3-658-17180-3}, year = {2017}, abstract = {Dieses kleine Buch stellt Hintergr{\"u}nde zum Abgasskandal dar, z. B. welche Schadstoffe kritisch sind, wie Motorsteuerger{\"a}te, Abgasr{\"u}ckf{\"u}hrung und Abgasnachbehandlung funktionieren, wie Manipulationen auf dem Pr{\"u}fstand m{\"o}glich 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 k{\"o}nnen und wie Manipulationen zuk{\"u}nftig rechtlich und politisch verhindert werden k{\"o}nnen. Dem Leser werden durch Literaturhinweise zus{\"a}tzliche Details erschlossen.}, subject = {Abgasemmission}, language = {de} } @article{ReuterFoerstlHartmannetal.2010, author = {Reuter, Carsten and Foerstl, Kai and Hartmann, Evi and Blome, Constantin}, title = {Sustainable Global Supplier Management: The Role of Dynamic Capabilities in Achieving Competitive Advantage}, series = {Journal of Supply Chain Management}, volume = {46}, journal = {Journal of Supply Chain Management}, number = {2}, pages = {45 -- 63}, year = {2010}, abstract = {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.}, subject = {Nachhaltigkeit}, language = {en} } @inproceedings{Reuter2017, author = {Reuter, Carsten}, title = {Understanding Directed Sourcing in Triadic Supply Networks}, year = {2017}, abstract = {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.}, subject = {Beschaffung}, language = {en} } @inproceedings{RueckerPancratzGoldVeerkampetal.2017, author = {R{\"u}cker, Michael T. and Pancratz, Nils and Gold-Veerkamp, Carolin and Pinkwart, Niels and Brinda, Torsten}, title = {Workshop zu Alltagsvorstellungen in der Informatik: Erhebungsmethodik und Implikationen f{\"u}r den Unterricht}, series = {Informatische Bildung zum Verstehen und Gestalten der digitalen Welt}, booktitle = {Informatische Bildung zum Verstehen und Gestalten der digitalen Welt}, editor = {Diethelm, Ira}, publisher = {K{\"o}llen Druck+Verlag GmbH}, address = {Bonn}, isbn = {978-3-88579-668-8}, pages = {393 -- 401}, year = {2017}, abstract = {Ein zentrales Konzept jeder konstruktivistisch gepr{\"a}gten Auffassung von Lernen ist, dass das Vorwissen, die Pr{\"a}konzepte und ggf. Fehlvorstellungen der Lernenden einen direkten Einfluss auf den Lernprozess haben: sowohl negativ als auch positiv. Speziell f{\"u}r die Informatik gilt, dass Lernende heutzutage von Beginn an in einer Welt aufwachsen, die von informatischen Artefakten und Systemen nahezu vollst{\"a}ndig durchdrungen ist. Sie beobachten sie, interagieren mit ihnen und formen so Vorstellungen {\"u}ber ihre Funktionsweisen und Eigenschaften. Sie bilden somit bereits im Alltag und vor dem Beginn jeglicher Schulbildung koh{\"a}rente Konzeptionen {\"u}ber zentrale Gegenst{\"a}nde und Inhalte der Informatik. Im Rahmen dieses Workshops werden zun{\"a}chst verschiedene methodische Ans{\"a}tze und erste Ergebnisse zu Erhebungen solcher Lernervorstellungen vorgestellt. Anschließend sollen diese anhand von drei Leitfragen verglichen und diskutiert werden: Welche St{\"a}rken und Schw{\"a}chen haben die jeweils verwendeten empirischen Methoden bei der Erhebung von Lernervorstellungen in der Informatik? Wie k{\"o}nnen sie sich ggf. sinnvoll erg{\"a}nzen? Welche Implikationen haben die erhobenen Vorstellungen f{\"u}r die Unterrichtspraxis?}, subject = {Forschungsmethode}, language = {de} } @inproceedings{KloppGoldVeerkampKuhnetal.2017, author = {Klopp, Marco and Gold-Veerkamp, Carolin and Kuhn, Martina and Abke, J{\"o}rg}, title = {Can Pair Programming Address Multidimensional Issues in Higher Education?}, series = {International Conference on Interactive Collaborative Learning (ICL)}, booktitle = {International Conference on Interactive Collaborative Learning (ICL)}, publisher = {Springer}, pages = {327 -- 334}, year = {2017}, abstract = {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.}, subject = {Extreme programming}, language = {en} } @inproceedings{StehlikovaProbstNentvichetal.2017, author = {Stehlikova, Veronika and Probst, Anne-Catherine and Nentvich, Ondrej and Urban, Martin and Inneman, Adolf and Sieger, Ladislav and Marsikova, Veronika and D{\"o}hring, Thorsten}, title = {Development of iridium coated silicon X-ray mirrors for Lobster Eye astronomical telescopes}, series = {Proceedings of EOSMOS 2017}, volume = {2017}, booktitle = {Proceedings of EOSMOS 2017}, number = {EOSMOS 2017}, publisher = {European Optical Society}, organization = {CVUT Prag}, pages = {1 -- 2}, year = {2017}, abstract = {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.}, subject = {Iridium}, language = {en} } @inproceedings{StehlikovaProserpioFriedrichetal.2017, author = {Stehlikova, Veronika and Proserpio, Laura and Friedrich, Peter and Madarasz, Emanuel and Breunig, Elias and Burwitz, Vadim and D{\"o}hring, Thorsten and Probst, Anne-Catherine}, title = {Indirect glass slumping of grazing incidence mirror segments for lightweight x-ray telescopes}, series = {Proceedings of the International Society for Optics and Photonics (SPIE)}, volume = {2017}, booktitle = {Proceedings of the International Society for Optics and Photonics (SPIE)}, number = {10399}, publisher = {SPIE}, organization = {Max-Planck Institut f{\"u}r extraterrestrische Physik}, doi = {10.1117/12.2272671}, pages = {103991Z-1 -- 103991Z-7}, year = {2017}, abstract = {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.}, subject = {Iridium}, language = {en} } @inproceedings{DoehringProbstEmmerichetal.2017, author = {D{\"o}hring, Thorsten and Probst, Anne-Catherine and Emmerich, Florian and Stollenwerk, Manfred and Stehlikova, Veronika and Friedrich, Peter and Damm, Christine}, title = {Development of iridium coated X-ray mirrors for astronomical applications}, series = {Proceedings of the International Society for Optics and Photonics (SPIE)}, volume = {2017}, booktitle = {Proceedings of the International Society for Optics and Photonics (SPIE)}, number = {10399}, publisher = {SPIE}, doi = {10.1117/12.2273988}, pages = {103991C-1 -- 103991C-8}, year = {2017}, abstract = {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.}, subject = {Iridium}, language = {en} }