TY - GEN
AU - Kraft, Kerstin
ID - 42870
TI - Kleider in Bewegung. Frauenmode seit 1850
ER -
TY - CONF
AU - Petrov, Dmitry
AU - Hilleringmann, Ulrich
ID - 39405
T2 - 2020 IEEE SENSORS
TI - Water-based primary cell for powering of wireless sensors
ER -
TY - BOOK
AB - Die h-Moll-Messe und die Johannes-Passion sind unzweifelhaft zwei Hauptwerke Johann Sebastian Bachs. Der vorliegende Band versammelt die Vorträge aus zwei Symposien, die im Oktober 2017 und März 2019 in Essen abgehalten worden sind. Im Dialog zwischen Theologie und Musikwissenschaft werden in den Beiträgen unterschiedliche Aspekte fokussiert, die je nach Werk zum einen eher auf dem Gebiet der Genese, Rezeption und Edition (h-Moll-Messe), zum anderen eher auf dessen theologischem oder musikgeschichtlichem Kontext (Johannes-Passion) liegen. In dieser interdisziplinären Zusammenstellung werden zahlreiche neue Facetten der Werke und ihrer Kontexte erhellt.
ED - Höink, Dominik
ED - Jacob, Andreas
ID - 36432
SN - 978-3-487-15916-4
TI - Musikwissenschaft und Theologie im Dialog - Johann Sebastian Bachs "h-Moll-Messe" und "Johannes-Passion"
VL - 20
ER -
TY - CHAP
AU - Höink, Dominik
ED - Höink, Dominik
ED - Jacob, Andreas
ID - 36461
SN - 9783487159164
T2 - Musikwissenschaft und Theologie im Dialog - Johann Sebastian Bachs "h-Moll-Messe" und "Johannes-Passion"
TI - Die h-Moll-Messe szenisch: Rosamund Gilmore (1986), Achim Freyer (1996) und Jochen Biganzoli (2017)
VL - 20
ER -
TY - CHAP
AU - Dehmel, Lukas
AU - Gerhardts, Lara
AU - Meister, Dorothee M.
ED - Meister, Dorothee M.
ED - Mindt, Ilka
ID - 43144
T2 - Mobile Medien im Schulkontext
TI - Zur Stabilisierung medienbezogener Handlungsroutinen im Lehrer*innenberuf. Längsschnittliche Betrachtungen zur Integration von Tablets in den Arbeitsalltag
ER -
TY - GEN
AU - Bohnenkamp, Björn
AU - Burkhardt, Marcus
AU - Grashöfer, Katja
AU - Hlukhovych, Adrianna
AU - Krewani, Angela
AU - Matzner, Tobias
AU - Missomelius, Petra
AU - Shnayien, Marie-Luise
ID - 42912
TI - Online-Lehre 2020 – Eine medienwissenschaftliche Perspektive. Diskussionspapier Nr. 10
ER -
TY - BOOK
ED - Burkhardt, Marcus
ED - Grashöfer, Katja
ED - Shnayien, Marie-Luise
ID - 42916
TI - Explorations in Digital Cultures
ER -
TY - CHAP
AB - Jeder Wissenschaftsdisziplin hilft ein Bewusstsein ihrer Geschichte und die Kenntnis ihrer Vielfalt, Paradigmen und Entwicklungsmöglichkeiten. Darauf basierend können Forschende ihr spezifisches Potential, Wissen und Handlungsrepertoire entfalten. Dabei ist Geschichtsschreibung und historische Berufsbildungsforschung immer zugleich selbst gefangen in ihrer je eigenen Zeit, beschränkt durch die Perspektiven der Personen, die sich an dem Rückblick beteiligen. Das macht Geschichte auch immer zur Geschichte der Herrschenden, die eine spezifische Perspektive und die mit ihr verbundene Forschung schreibend tradieren. Deshalb ist Vielfalt für die historische Berufsbildungsforschung so wertvoll, weil sie sich gegen verengte, eindimensionale Retrospektive stellt, gewissermaßen in die Ritzen und Fugen der Zeit schauen lässt.
Basierend auf einer Tagung der Herausgeber im September 2019 zu „Retrospektiven, Perspektiven & Synergien einer Historischen Berufsbildungs- und Wissenschaftsforschung" an der Universität Rostock, entfaltet sich die Bandbreite der historischen Berufsbildungsforschung. Der Band vereint paradigmatische, mal stärker biografischen Zugänge sowie systemisch-gesellschaftspolitische und schließlich Analysen zur Genese der Wissenschaftsdisziplin. In den Beiträgen wird dem Einfluss von Einzelpersönlichkeiten und Forschungsparadigmen ebenso wie dem von Bildungssystemen am Beispiel der DDR, Skandinaviens und der bundesdeutschen Bildungspolitik nachgegangen. Vereint sind sowohl Beiträge zur Entstehung der Berufs- und Wirtschaftspädagogik, zur Rekonstruktion der Benachteiligtenförderung, Soziökonomie, Pflegedidaktik und Frauenforschung als auch Analysen berufsspezifischer Betrachtungen am Beispiel des Druckgewerbes, der Offiziere und der Ausbilder*innen.
AU - Heisler, Dietmar
ED - Kaiser, Franz
ED - Götzel, Mathias
ID - 37004
KW - Benachteiligtenförderung
KW - historische Berufsbildungsforschung
KW - berufliche Förderung
KW - Sozialpädagogik
T2 - Historische Berufsbildungsforschung Perspektiven auf Wissenschaftsgenese und -dynamik.
TI - Reparaturbetrieb, Inklusion und Fachkräftesicherung Transformation der Benachteiligtenförderung in Deutschland.
ER -
TY - JOUR
AU - Hälterlein, Jens
ID - 43352
IS - 1
JF - TATuP
TI - (Un)Sicherheitsproduktion im Cyberspace. Cybersecurity-Architekturen in Deutschland und der Schweiz
VL - 29
ER -
TY - JOUR
AU - Hälterlein, Jens
ID - 43351
JF - Soziopolis
TI - Die Simulation der Pandemie..Ein Beitrag zur Reihe "Sicherheit in der Krise".
ER -
TY - CONF
AU - Engemann, Mario
ID - 43411
TI - Lehrerkooperation und Digitalisierung - Gestaltung digital-kooperativer Arbeitsbeziehungen und der Stellenwert einer Fachlichkeitskonzeption von Lehrenden der Fächergruppe Erziehungswissenschaft
ER -
TY - GEN
AU - Schroeter-Wittke, Harald
ID - 41071
SN - 0540–6226
T2 - Jahrbuch für Evangelische Kirchengeschichte des Rheinlandes
TI - Gero Fuchs: Gewinn als Umbruch der Ordnung? Der Fall des Siegburger Töpfers Peter Knütgen im 16. Jahrhundert, Tübingen 2019
VL - 69
ER -
TY - GEN
AU - Schroeter-Wittke, Harald
ID - 41072
SN - 0540–6226
T2 - Jahrbuch für Evangelische Kirchengeschichte des Rheinlandes
TI - Laura Schmidt: Weihnachtliches Theater. Zur Entstehung und Geschichte einer bürgerlichen Fest- und Theaterkultur, Bielefeld 2017
VL - 69
ER -
TY - JOUR
AB - Dieser Beitrag basiert auf den Ergebnissen eines im Jahr 2019 abgeschlossenen Promotionsvorhabens im Rahmen des interventiv angelegten, in Dortmund angesiedelten, Forschungsprojekts KidSmart – Medienkompetent zum Schulübergang zu den Mediensozialisationsbedingungen von deutschen, deutsch-türkischen und deutsch-anderen vier und fünf Jahre alten Mädchen und Jungen in den sozialen Feldern Familie und Kita. Im vorliegenden Beitrag wird auf die Befragung der ErzieherInnen fokussiert, die mittels halbstandardisierter Fragebögen durchgeführt wurde. Untersucht wurde, wie sich der sprachlich-kulturelle Hintergrund der Kinder für das Kommunikationsverhalten der ErzieherInnen mit den Kindern in pädagogischer Anschlusskommunikation und in Gesprächen mit den Eltern der Kinder auswirkt. Hier wurde auch eine intersektionale Perspektive eingenommen und parallel zur Herkunftskultur auch das biologische Geschlecht der Kinder in die Auswertung einbezogen. Es stellte sich heraus, dass die Kommunikation sowohl mit den Kindern als auch mit den Eltern in Abhängigkeit der Herkunftskultur der Kinder und auch ihres Geschlechtes erfolgt. Pädagogisch ist zu fragen, inwiefern es den pädagogischen Fachkräften gelingt, benachteiligende Ausgangslagen auch tatsächlich auszugleichen und Partizipation im Sinne von Inklusion zu ermöglichen. Ausgehend von diesen Ergebnissen wird in diesem Beitrag die Bedeutung und Relevanz der Überschneidungen und Interdependenzen von Ungleichheitsdimensionen für eine inklusionsorientierte Qualifikation pädagogischer Fachkräfte in institutionell-frühkindlichen Medienbildungskontexten diskutiert. Konkret richtet sich der Blick auf die sprachlich-kulturelle Ein- und Vielfalt in den frühkindlichen Einrichtungen sowie die Wahrnehmungen und Einschätzungen der pädagogischen Fachkräfte, die sie in Hinblick auf die Kooperationswilligkeit der Eltern, die Anschlusskommunikation mit den Kindern und schließlich die medialen Fähig- und Fertigkeiten der Kinder äußern.
AU - Günesli, Habib
ID - 44057
IS - 3
JF - QfI - Qualifizierung für Inklusion Online-Zeitschrift zur Forschung über Aus-, Fort- und Weiterbildung pädagogischer Fachkräfte
TI - Inklusion und Intersektionalität im Kontext frühkindlicher Medienbildungsforschung. Sprachkulturelle Homogenität und Diversität sowie ihre Auswirkungen auf pädagogische Kommunikation in der Frühen Bildung
VL - 2
ER -
TY - CONF
AU - Chadha, Gavneet Singh
AU - Meydani, Elnaz
AU - Schwung, Andreas
ID - 44074
T2 - Recent Advances in Big Data and Deep Learning: Proceedings of the INNS Big Data and Deep Learning Conference INNSBDDL2019, held at Sestri Levante, Genova, Italy 16-18 April 2019
TI - Regularizing neural networks with gradient monitoring
ER -
TY - JOUR
AB - We devise a method to certify nonclassical features via correlations of phase-space distributions by unifying the notions of quasiprobabilities and matrices of correlation functions. Our approach complements and extends recent results that were based on Chebyshev's integral inequality \cite{BA19}. The method developed here correlates arbitrary phase-space functions at arbitrary points in phase space, including multimode scenarios and higher-order correlations. Furthermore, our approach provides necessary and sufficient nonclassicality criteria, applies to phase-space functions beyond s-parametrized ones, and is accessible in experiments. To demonstrate the power of our technique, the quantum characteristics of discrete- and continuous-variable, single- and multimode, as well as pure and mixed states are certified only employing second-order correlations and Husimi functions, which always resemble a classical probability distribution. Moreover, nonlinear generalizations of our approach are studied. Therefore, a versatile and broadly applicable framework is devised to uncover quantum properties in terms of matrices of phase-space distributions.
AU - Bohmann, Martin
AU - Agudelo, Elizabeth
AU - Sperling, Jan
ID - 26290
JF - Quantum
SN - 2521-327X
TI - Probing nonclassicality with matrices of phase-space distributions
ER -
TY - JOUR
AU - Sperling, Jan
AU - Walmsley, I A
ID - 26292
JF - Physica Scripta
SN - 0031-8949
TI - Classical evolution in quantum systems
ER -
TY - JOUR
AB - Semiconductor microcavities are frequently studied in the context of semiconductor lasers and in application-oriented fundamental research on topics such as linear and nonlinear polariton systems, polariton lasers, polariton pattern formation, and polaritonic Bose–Einstein condensates. A commonly used approach to describe theoretical properties includes a phenomenological single-mode equation that complements the equation for the nonlinear optical response (interband polarization) of the semiconductor. Here, we show how to replace the single-mode equation by a fully predictive transfer function method that, in contrast to the single-mode equation, accounts for propagation, retardation, and pulse-filtering effects of the incident light field traversing the distributed Bragg reflector (DBR) mirrors, without substantially increasing the numerical complexity of the solution. As examples, we use cavities containing GaAs quantum wells and transition-metal dichalcogenides (TMDs).
AU - Carcamo, M.
AU - Schumacher, Stefan
AU - Binder, R.
ID - 40438
IS - 22
JF - Applied Optics
KW - Atomic and Molecular Physics
KW - and Optics
KW - Engineering (miscellaneous)
KW - Electrical and Electronic Engineering
SN - 1559-128X
TI - Transfer function replacement of phenomenological single-mode equations in semiconductor microcavity modeling
VL - 59
ER -
TY - JOUR
AU - Ma, Xuekai
AU - Kartashov, YV
AU - Kavokin, A
AU - Schumacher, Stefan
ID - 20586
IS - 20
JF - Optics Letters
SN - 0146-9592
TI - Chiral condensates in a polariton hexagonal ring.
VL - 45
ER -
TY - JOUR
AU - von Bardeleben, H. J.
AU - Rauls, E.
AU - Gerstmann, Uwe
ID - 40444
IS - 18
JF - Physical Review B
SN - 2469-9950
TI - Carbon vacancy-related centers in 3C-silicon carbide: Negative-U properties and structural transformation
VL - 101
ER -
TY - JOUR
AB -
EPR spectroscopy reveals the universality class and dynamic effects of the [NH4][Zn(HCOO)3] hybrid formate framework.
AU - Navickas, Marius
AU - Giriūnas, Laisvydas
AU - Kalendra, Vidmantas
AU - Biktagirov, Timur
AU - Gerstmann, Uwe
AU - Schmidt, Wolf Gero
AU - Mączka, Mirosław
AU - Pöppl, Andreas
AU - Banys, Jūras
AU - Šimėnas, Mantas
ID - 17070
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
TI - Electron paramagnetic resonance study of ferroelectric phase transition and dynamic effects in a Mn2+ doped [NH4][Zn(HCOO)3] hybrid formate framework
VL - 22
ER -
TY - JOUR
AU - Biktagirov, Timur
AU - Gerstmann, Uwe
ID - 29745
IS - 2
JF - Physical Review Research
KW - General Engineering
SN - 2643-1564
TI - Spin-orbit driven electrical manipulation of the zero-field splitting in high-spin centers in solids
VL - 2
ER -
TY - JOUR
AB - Density-functional theory calculations of (TiO2)n clusters (n = 1–5) in the gas phase and adsorbed on pristine graphene as well as graphene quantum dots are presented. The cluster adsorption is found to be dominated by van der Waals forces. The electronic structure and in particular the excitation energies of the bare clusters and the TiO2/graphene composites are found to vary largely in dependence on the size of the respective constituents. This holds in particular for the energy and the spatial localization of the highest occupied and lowest unoccupied molecular orbitals. In addition to a substantial gap narrowing, a pronounced separation of photoexcited electrons and holes is predicted in some instances. This is expected to prolong the lifetime of photoexcited carriers. Altogether, TiO2/graphene composites are predicted to be promising photocatalysts with improved electronic and photocatalytic properties compared to bulk TiO2.
AU - Badalov, Sabuhi
AU - Wilhelm, René
AU - Schmidt, Wolf Gero
ID - 19189
JF - Journal of Computational Chemistry
SN - 0192-8651
TI - Photocatalytic properties of graphene‐supported titania clusters from density‐functional theory
ER -
TY - JOUR
AB - AbstractSemiconductor quantum dots are excellent candidates for ultrafast coherent manipulation of qubits by laser pulses on picosecond timescales or even faster. In inhomogeneous ensembles a macroscopic optical polarization decays rapidly due to dephasing, which, however, is reversible in photon echoes carrying complete information about the coherent ensemble dynamics. Control of the echo emission time is mandatory for applications. Here, we propose a concept to reach this goal. In a two-pulse photon echo sequence, we apply an additional resonant control pulse with multiple of 2π area. Depending on its arrival time, the control slows down dephasing or rephasing of the exciton ensemble during its action. We demonstrate for self-assembled (In,Ga)As quantum dots that the photon echo emission time can be retarded or advanced by up to 5 ps relative to its nominal appearance time without control. This versatile protocol may be used to obtain significantly longer temporal shifts for suitably tailored control pulses.
AU - Kosarev, Alexander N.
AU - Rose, Hendrik
AU - Poltavtsev, Sergey V.
AU - Reichelt, Matthias
AU - Schneider, Christian
AU - Kamp, Martin
AU - Höfling, Sven
AU - Bayer, Manfred
AU - Meier, Torsten
AU - Akimov, Ilya A.
ID - 20773
IS - 1
JF - Communications Physics
SN - 2399-3650
TI - Accurate photon echo timing by optical freezing of exciton dephasing and rephasing in quantum dots
VL - 3
ER -
TY - JOUR
AB - Vortices are topological objects representing the circular motion of a fluid. With their additional degree of freedom, the vorticity, they have been widely investigated in many physical systems and different materials for fundamental interest and for applications in data storage and information processing. Vortices have also been observed in non-equilibrium exciton-polariton condensates in planar semiconductor microcavities. There they appear spontaneously or can be created and pinned in space using ring-shaped optical excitation profiles. However, using the vortex state for information processing not only requires creation of a vortex but also efficient control over the vortex after its creation. Here we demonstrate a simple approach to control and switch a localized polariton vortex between opposite states. In our scheme, both the optical control of vorticity and its detection through the orbital angular momentum of the emitted light are implemented in a robust and practical manner.
AU - Meier, Torsten
AU - Ma, Xuekai
AU - Berger, Bernd
AU - Aßmann, Marc
AU - Driben, Rodislav
AU - Schneider, Christian
AU - Höfling, Sven
AU - Schumacher, Stefan
ID - 43747
IS - 1
JF - Nature communications
TI - Realization of all-optical vortex switching in exciton-polariton condensates
VL - 11
ER -
TY - CONF
AU - Hannes, Wolf-Rüdiger
AU - Meier, Torsten
ED - Betz, Markus
ED - Elezzabi, Abdulhakem Y.
ID - 20770
SN - 9781510633193
T2 - Ultrafast Phenomena and Nanophotonics XXIV
TI - k.p-based multiband simulations of non-degenerate two-photon absorption in bulk GaAs
VL - 11278
ER -
TY - JOUR
AU - Hannes, W.-R.
AU - Trautmann, Alexander
AU - Stein, M.
AU - Schäfer, F.
AU - Koch, M.
AU - Meier, Torsten
ID - 20563
IS - 7
JF - Physical Review B
TI - Strongly nonresonant four-wave mixing in semiconductors
VL - 101
ER -
TY - JOUR
AU - Song, Xiaohong
AU - Yang, Shidong
AU - Zuo, Ruixin
AU - Meier, Torsten
AU - Yang, Weifeng
ID - 20772
JF - Physical Review A
SN - 2469-9926
TI - Enhanced high-order harmonic generation in semiconductors by excitation with multicolor pulses
VL - 101
ER -
TY - JOUR
AU - Bocchini, Adriana
AU - Eigner, Christof
AU - Silberhorn, Christine
AU - Schmidt, Wolf Gero
AU - Gerstmann, Uwe
ID - 20682
JF - Phys. Rev. Materials
TI - Understanding gray track formation in KTP: Ti^3+ centers studied from first principles
VL - 4
ER -
TY - CONF
AU - Müller, Inez
ID - 44159
SN - 978-3-86205-600-2
TI - Generationelle und gesellschaftliche Differenzen im wiedervereinigten Deutschland - "Der neunzigste Geburtstag. Ein ländliches Idyll" von Günter de Bruyn in postkolonialer Lesart.
VL - 11
ER -
TY - JOUR
AU - Müller, Inez
ID - 44160
JF - Peter Weiss Jahrbuch
SN - 978-3-86110-748-4
TI - Transmediale und transkulturelle Schreibweisen im Exil der Gegenwart - Prosa und Lyrik syrischer Autoren in Europa
VL - 28
ER -
TY - CHAP
AU - Moritzer, Elmar
AU - Hüttner, M.
AU - Henning, Bernd
AU - Webersen, Manuel
ID - 24479
T2 - Advances in Polymer Processing 2020
TI - The Influence of Hydrothermal Aging on the Material Properties of Continuous Fiber-Reinforced Thermoplastics and its Non-Destructive Characterization
ER -
TY - JOUR
AU - Grabo, Matti
AU - Staggenborg, Christoph
AU - Philippi, Kai Alexander
AU - Kenig, Eugeny
ID - 22266
JF - Frontiers in Energy Research
SN - 2296-598X
TI - Modeling and Optimization of Rectangular Latent Heat Storage Elements in an Air-Guided Heat Storage System
VL - 8
ER -
TY - JOUR
AB - The influence of latent heat storage elements on the cooling performance and the temperature rise time of household refrigerating appliances is studied experimentally in the context of the “new global refriger- ator standard”IEC 62552:2015. In addition to the daily energy consumption, this international standard- ization introduced performance tests for cooling capacity and temperature rise time. While the cooling capacity has long been anchored in various test procedures of consumer organizations, the temperature rise time, which has only been tested on freezers so far, will be a decisive factor in the future. Moreover, the need for so-called "smart appliances" that may balance power consumption is increasing since such devices may compensate the volatility of renewable energies and thus stabilize the power grid. Against this background, eight commercial household refrigerators and refrigerator-freezers are equipped with polymer-bound phase change materials (PCM) and their performance is determined under the new stan- dard test conditions. The results show that the introduction of PCM increases the cooling capacity by up to 33 % and also increases the temperature rise time by up to 145 %, without affecting power consump- tion, as compared to the unmodified refrigeration appliances.
AU - Sonnenrein, Gerrit
AU - Baumhögger, Elmar
AU - Elsner, Andreas
AU - Morbach, A.
AU - Neukötter, Moritz
AU - Paul, Andreas
AU - Vrabec, J.
ID - 21514
JF - International Journal of Refrigeration
SN - 0140-7007
TI - Improving the performance of household refrigerating appliances through the integration of phase change materials in the context of the new global refrigerator standard IEC 62552:2015
VL - 119
ER -
TY - JOUR
AB - Despite the omnipresence of household refrigeration appliances, there is still a lack of knowledge about their agerelated efficiency loss over time. Past studies provide basic evidence for increasing electricity consumption of cooling appliances with ageing but fail to investigate the associated technical wear. Concentrating on the degradation of the thermal insulation, we first determined the ageing process of sealed samples of polyurethane rigid foam by investigating changes in cell gas composition and thermal conductivity over time. Simultaneously, the main challenge was to develop an approach that investigates the age-related efficiency loss of the insulation without its destruction. This testing procedure is referred to as the Bonn method. The non-destructive Bonn method was applied to varying refrigerator models in a series of successive experiments to evaluate the insulation degradation over time. Subsequently, the physical relationship between the test value of the Bonn method and the heat transfer through the multi-layered compartment walls of domestic refrigeration appliances was established, ultimately characterising the degrading insulation in terms of increasing heat transfer. Our results give substantiated evidence that the efficiency loss of cooling appliances is greatly influenced by insulation degradation over time. The ageing of sealed samples of polyurethane rigid foam indicates a large initial increase of thermal conductivity by 15% within the first year, corresponding to a change in cell gas composition. These results are in line with those of the Bonn method, emphasising an increasing heat flow through the multi-layered compartment walls of domestic refrigerators with ageing. Therewith, the present study is of significance to a wide range of stakeholders and forms the basis for future research.
AU - Hueppe, Christian
AU - Geppert, Jasmin
AU - Stamminger, Rainer
AU - Wagner, Hendrik
AU - Hoelscher, Heike
AU - Vrabec, Jadran
AU - Paul, Andreas
AU - Elsner, Andreas
AU - Becker, Wolfgang
AU - Gries, Ulrich
AU - Freiberger, Alfred
ID - 21512
JF - Applied Thermal Engineering
SN - 1359-4311
TI - Age-related efficiency loss of household refrigeration appliances: Development of an approach to measure the degradation of insulation properties
VL - 173
ER -
TY - GEN
AB - Due to the trend towards lightweight design in car body development mechanical joining technologies become increasingly important. These techniques allow for the joining of dissimilar materials and thus enable multi-material design, while thermic joining methods reach their limits. Semi-tubular self-piercing riveting is an important mechanical joining technology. The rivet production, however, is costly and time-consuming, as the process consists of several process steps including the heat treatment and coating of the rivets in order to achieve an adequate strength and corrosion resistance. The use of high nitrogen steel as rivet material leads to the possibility of reducing process steps and hence increasing the efficiency of the process. However, the high tool loads being expected due to the high strain hardening of the material are a major challenge during the rivet production. Thus, there is a need for appropriate forming strategies, such as the manufacturing of the rivets at elevated temperatures. Prior investigations led to the conclusion that forming already at 200 °C results in a distinct reduction of the yield strength. To create a deeper understanding of the forming behaviour of high nitrogen steel at elevated temperatures, compression tests were conducted in a temperature range between room temperature and 200 °C. The determined true stress – true strain curves are the basis for the further process and tool design of the rivet production. Another key factor for the rivet manufacturing at elevated temperatures is the influence of the process temperature on the tribological conditions. For this reason, ring compression tests at room temperature and 200 °C are carried out. The friction factors are determined on the basis of calibration curves resulting from the numerical analysis of the ring compression process. The investigations indicate that the friction factor at 200 °C is significantly higher compared to room temperature. This essential fact has to be taken into account for the process and tool design for the rivet production using high nitrogen steel.
ED - Kuball, Clara-Maria
ED - Jung, R
ED - Uhe, Benedikt
ED - Meschut, Gerson
ED - Merklein, Marion
ID - 19974
KW - High nitrogen steel
KW - Self-piercing riveting
KW - Joining by forming
KW - Bulk forming
KW - Strain hardening
TI - Influence of the process temperature on the forming behaviour and the friction during bulk forming of high nitrogen steel
VL - 1
ER -
TY - JOUR
AB - As a result of lightweight design, increased use is being made of high-strength steel and aluminium in car bodies. Self-piercing riveting is an established technique for joining these materials. The dissimilar properties of the two materials have led to a number of different rivet geometries in the past. Each rivet geometry fulfils the requirements of the materials within a limited range. In the present investigation, an improved rivet geometry is developed, which permits the reliable joining of two material combinations that could only be joined by two different rivet geometries up until now. Material combination 1 consists of high-strength steel on both sides, while material combination 2 comprises aluminium on the punch side and high-strength steel on the die side. The material flow and the stress and strain conditions prevailing during the joining process are analysed by means of numerical simulation. The rivet geometry is then improved step-by-step on the basis of this analysis. Finally, the improved rivet geometry is manufactured and the findings of the investigation are verified in experimental joining tests.
AU - Uhe, Benedikt
AU - Kuball, Clara-Maria
AU - Merklein, Marion
AU - Meschut, Gerson
ID - 19973
JF - Production Engineering
KW - Self-piercing riveting
KW - Joining technology
KW - Rivet geometry
KW - Multi-material design
KW - High-strength steel
KW - Aluminium
TI - Improvement of a rivet geometry for the self-piercing riveting of high-strength steel and multi-material joints
VL - 14
ER -
TY - JOUR
AU - Tinkloh, Steffen Rainer
AU - Wu, Tao
AU - Tröster, Thomas
AU - Niendorf, Thomas
ID - 15945
JF - Composite Structures
SN - 0263-8223
TI - A micromechanical-based finite element simulation of process-induced residual stresses in metal-CFRP-hybrid structures
VL - 238
ER -
TY - JOUR
AU - Martin, Sven
AU - Camberg, Alan A.
AU - Tröster, Thomas
ID - 16859
JF - Procedia Manufacturing
SN - 2351-9789
TI - Probability Distribution of Joint Point Loadings in Car Body Structures under Global Bending and Torsion
ER -
TY - CONF
AU - Bertling, René
AU - Hack, Mathias
AU - Ausner, Ilja
AU - Kenig, Eugeny
ID - 23409
TI - CFD Simulation of Film and Rivulet Flows on Microstructured Surfaces
ER -
TY - CONF
AU - Rozo Vasquez, Julian
AU - Arian, Bahman
AU - Riepold, Markus
AU - Homberg, Werner
AU - Trächtler, Ansgar
AU - Walther, Frank
ID - 22965
T2 - 54. Metallographie-Tagung
TI - Microstructural investigation on phase transformation during flow forming of the metastable austenite AISI 304
ER -
TY - JOUR
AU - Ma, Xuekai
AU - Berger, B
AU - Aßmann, M
AU - Driben, R
AU - Meier, Torsten
AU - Schneider, C
AU - Höfling, S
AU - Schumacher, Stefan
ID - 20580
IS - 1
JF - Nature Communications
SN - 2041-1723
TI - Realization of all-optical vortex switching in exciton-polariton condensates
VL - 11
ER -
TY - JOUR
AU - Ahrens, Stephan
ID - 44371
IS - Nr. 1
JF - Journal of Italian Cinema & Media Studies 9, Nr. 1
TI - Federico Fellini’s Sanctifying Effect.
ER -
TY - BOOK
AU - Ahrens, Stephan
ID - 44365
TI - Vom Klang bewegt. Das Kino und Ludwig van Beethoven.
ER -
TY - JOUR
AU - Ahrens, Stephan
ID - 44393
JF - Dschungel (jungle World)
TI - Offensive Sensation. Ein Porträt von Melina Mercouri
ER -
TY - GEN
AU - Ahrens, Stephan
ID - 44395
T2 - in die tageszeitung
TI - Glücklich ohne Happy End
ER -
TY - GEN
AU - Ahrens, Stephan
ID - 44396
T2 - Dschungel (Jungle World)
TI - Das Stadtgespräch
ER -
TY - GEN
AU - Ahrens, Stephan
ID - 44394
TI - In memoriam Sarah Maldoror
ER -
TY - GEN
AU - Ahrens, Stephan
ID - 44402
TI - Eine andere Welt, Porträt Stéphane Brizé
ER -
TY - JOUR
AU - Schultz, Andreas Maximilian
AU - Lamers, Christoph
AU - Koch, Rainer
AU - Lüke, Richard
AU - Sauerland, Torben
ID - 22898
JF - vfdb-Zeitschrift
TI - IRiS – Intelligente Rettung im SmartHome
VL - 4
ER -
TY - CHAP
AU - Eckel, Julia
ED - Beyer, Marcel
ID - 44470
T2 - Exzess und Entzug: Ferres vor Gursky, Ferres vor Immendorff
TI - Ferres vor/neben/mit/am … – Instagrammatikalische Präpositionen
ER -
TY - CHAP
AU - Eckel, Julia
ED - Althoff, Sebastian
ED - Linseisen, Elisa
ED - Müller, Maja-Lisa
ED - Winter, Franziska
ID - 44471
T2 - Re-/Dissolving Mimesis
TI - Re/Dis-Solved Selves: (Re)Searching Selfies, (Inter)Facing the Face
ER -
TY - CHAP
AU - Spiegel, Anna
ED - Poferl, Angelika
ED - Winkel, Heidemarie
ID - 36726
T2 - Multiple Gender Cultures, Sociology and Plural Modernities. Re-reading Social Constructions of Gender across the Globe in a De-Colonial Perspective.
TI - The Work of Entanglement. Translating Women's Rights in Malaysia
ER -
TY - BOOK
ED - Köngeter, Stefan
ED - Engel, Nicolas
ED - Spiegel, Anna
ED - Klemm, Matthias
ED - Struve, Karen
ED - Klein-Zimmer, Kathrin
ED - Duscha, Annemarie
ED - Chmelar, Kristina
ED - Bretting, Johannes
ID - 44480
SN - 3837643808
TI - Wissen in der Transnationalisierung. Zur Ubiquität und Krise der Übersetzung
ER -
TY - CONF
AB - This paper presents the results of static short-term and long-term tensile tests for beta-nucleated joined polypropylene samples by the hot plate welding process. In the present study different dimensionless joining displacements are accounted for. The results show that high short-term tensile strength does not directly transfer to high long-term tensile strength. The morphology of the weld seam in the joined samples is examined by means of transmitted and reflected light microscopy. For the dimensionless joining displacements of 0.75 and 0.95, stretched spherulites are obtained. X-Ray diffraction can be used as a tool for qualitative and quantitative analysis and eventually for differentiation of samples of various joining displacements.
AU - Wübbeke, Andrea
AU - Schöppner, Volker
AU - Paul, André
AU - Tiemann, Michael
AU - Austermeier, Laura
AU - Fitze, Marcus
AU - Chen, Mingie
AU - Jakob, Fabian
AU - Heim, Hans-Peter
AU - Wu, Tao
AU - Niendorf, Thomas
AU - Röhricht, Marie-Luise
AU - Schmidt, Michael
ID - 42892
T2 - SPE ANTEC 2020: The Virtual Edition 5
TI - Long- and Short-Term Tensile Strength and Morphology of Joined Beta-Nucleated Polypropylene Parts
ER -
TY - CONF
AU - Schöppner, Volker
AU - Wübbeke, Andrea
AU - Geißler, B.
AU - Schmidt, M.
AU - Maginer, A.
AU - Wu, T.
AU - Niendorf, T.
AU - Jakob, F.
AU - Heim, H.
ID - 24245
T2 - 73rd Annual Assembly of the International Institute of Welding (IIW)
TI - Investigation of residual stresses of hot plate welding
ER -
TY - JOUR
AB - In diesem Artikel werden das Scherzugverhalten und der morphologische Zustand von konturgeschweißtem Polypropylen (PP) mit einem Massenanteil von 0,2% Ruß untersucht. Dabei zeigen die Ergebnisse ...
AU - Schöppner, Volker
AU - Wübbeke, Andrea
AU - Schriegel, Fabian
AU - Paul, Andrej
AU - Tiemann, Michael
AU - Geißler, Bastian
AU - Schmidt, Michael
AU - Magnier, Arnaud
AU - Niendorf, Thomas
ID - 24236
JF - Joining Plastics
TI - Selected Aspects for the Assessment of Laser Transmission Welding
ER -
TY - CONF
AU - Schöppner, Volker
AU - Wübbeke, Andrea
AU - Paul, A.
AU - Tiemann, M.
AU - Austermeier, Laura
AU - Fitze, M.
AU - Chen, M.
AU - Jakob, F.
AU - Heim, H.-P-
AU - Wu, T.
AU - Niendorf, T.
AU - Röhricht, M.-L.
AU - Schmidt, M.
ID - 24472
T2 - ANTEC20
TI - LONG- AND SHORT-TERM TENSILE STRENGTH AND MORPHOLOGY OF JOINED BETA-NUCLEATED POLYPROPYLENE PARTS
ER -
TY - JOUR
AU - Rostek, Tim
AU - Wiens, Eugen
AU - Homberg, Werner
ID - 30713
JF - Procedia Manufacturing
TI - Joining with Versatile Friction-Spun Joint Connectors
VL - 47
ER -
TY - CONF
AB - Even though the spectrum of parts is expected to shift over the long term as a result of increasing e-mobility, there is still an extremely high demand for complex components made of high-strength materials which can only be produced by hydroforming technologies. The innovative combination of hydroforming processes with other forming processes, as well as the improvement of the processes themselves, offers considerable potential for improvement.
A number of promising ways of improving the hydroforming process chain are therefore the subject of this contribution. The focus of the article is on possible approaches for combining (incremental) pre- and post-forming operations, which can permit considerable improvements in both quality and features at a reduced cost. Furthermore, a novel combination of quasi-static and high-speed forming processes is presented, leading to an improved overall forming process (with a high application potential) for the production of complex parts.
AU - Wiens, Eugen
AU - Djakow, Eugen
AU - Homberg, Werner
ID - 21447
KW - Hydroforming
KW - Incremental Forming
KW - Internal Flow-turning
KW - High-speed Forming
T2 - Nebu/Nehy 2020
TI - Some ideas for the further development of hydroforming process chains
ER -
TY - JOUR
AB - In this paper, we study properties of the algebras of planar quasi-invariants. These algebras are Cohen–Macaulay and Gorenstein in codimension one. Using the technique of matrix problems, we classify all Cohen–Macaulay modules of rank one over them and determine their Picard groups. In terms of this classification, we describe the spectral modules of the planar rational Calogero–Moser systems. Finally, we elaborate the theory of the algebraic inverse scattering method, providing explicit computations of some ‘isospectral deformations’ of the planar rational Calogero–Moser system in the case of the split rational potential.
AU - Burban, Igor
AU - Zheglov, A.
ID - 44331
IS - 4
JF - Proceedings of the London Mathematical Society
TI - Cohen-Macaulay modules over the algebra of planar quasi-invariants and Calogero-Moser systems
VL - 121
ER -
TY - CHAP
AU - van Ackeren, Isabell
AU - Buhl, Heike M.
AU - Eickelmann, Birgit
AU - Heinrich, Martin
AU - Wolfswinkler, Günther
ED - Kaspar, Kai
ED - Becker-Mrotzek, Michael
ED - Hofhues, Sandra
ED - König, Johannes
ED - Schmeinck, Daniela
ID - 28883
T2 - Bildung, Schule und Digitalisierung
TI - Digitalisierung in der Lehrerbildung durch Communities of Practice. Konzeption, Governance und Qualitätsmanagement des ComeIn-Verbundvorhabens in Nordrhein-Westfalen
ER -
TY - CHAP
AU - Labusch, Amelie
AU - Eickelmann, Birgit
AU - Drossel, Kerstin
AU - Vennemann, Mario
ED - Eickelmann, Birgit
ED - Labusch, Amelie
ED - Drossel, Kerstin
ED - Vennemann, Mario
ID - 27838
T2 - ICILS 2018 #NRW. Vertiefende Analysen und Befunde für Nordrhein-Westfalen im internationalen Vergleich
TI - Digitalisierungsbezogene Berufswahlneigung und Sichtweisen von Mädchen und Jungen auf die Relevanz digitaler Medien für die Gesellschaft
ER -
TY - JOUR
AU - Eickelmann, Birgit
AU - Drossel, Kerstin
ID - 28882
JF - SchulVerwaltung BW
TI - Schulschließungen und Perspektiven für die Pandemie-Zeit –– Ergebnisse der Studie ‚Schule auf Distanz‘
VL - 12
ER -
TY - JOUR
AU - Eickelmann, Birgit
AU - Kummer Wyss, Annemarie
ID - 28908
IS - 4
JF - Journal für Schulentwicklung
TI - Fortbildung im digitalen Zeitalter. Editorial
VL - 24
ER -
TY - BOOK
AU - Labusch, Amelie
AU - Eickelmann, Birgit
AU - Conze, Daniela
ID - 28905
TI - ICILS 2018 #Transfer. Gestaltung digitaler Schulentwicklung in Deutschland
ER -
TY - CHAP
AU - Eickelmann, Birgit
AU - Drossel, Kerstin
AU - Labusch, Amelie
AU - Heldt, Melanie
ED - Eickelmann, Birgit
ED - Labusch, Amelie
ED - Drossel, Kerstin
ED - Vennemann, Mario
ID - 27839
T2 - ICILS 2018 #NRW. Vertiefende Analysen und Befunde für Nordrhein-Westfalen im internationalen Vergleich
TI - Wünsche zur schulischen Nutzung digitaler Medien, digitalisierungsbezogene Berufswahlneigung und Sichtweisen von Schülerinnen und Schülern auf die Relevanz digitaler Medien für die Gesellschaft
ER -
TY - CHAP
AU - Drossel, Kerstin
AU - Lorenz, Ramona
AU - Labusch, Amelie
AU - Eickelmann, Birgit
ED - Eickelmann, Birgit
ED - Labusch, Amelie
ED - Drossel, Kerstin
ED - Vennemann, Mario
ID - 27853
T2 - ICILS 2018 #NRW. Vertiefende Analysen und Befunde für Nordrhein-Westfalen im internationalen Vergleich
TI - Selbsteingeschätzte Kompetenzen von Lehrkräften zum schulischen Einsatz digitaler Medien
ER -
TY - CHAP
AU - Labusch, Amelie
AU - Eickelmann, Birgit
AU - Gerick, Julia
AU - Drossel, Kerstin
ED - Eickelmann, Birgit
ED - Labusch, Amelie
ED - Drossel, Kerstin
ED - Vennemann, Mario
ID - 27842
T2 - ICILS 2018 #NRW. Vertiefende Analysen und Befunde für Nordrhein-Westfalen im internationalen Vergleich
TI - Kompetenzen im Bereich ‚Computational Thinking‘ von Mädchen und Jungen
ER -
TY - CHAP
AU - Drossel, Kerstin
AU - Eickelmann, Birgit
ED - Eickelmann, Birgit
ED - Labusch, Amelie
ED - Drossel, Kerstin
ED - Vennemann, Mario
ID - 27849
T2 - ICILS 2018 #NRW. Vertiefende Analysen und Befunde für Nordrhein-Westfalen im internationalen Vergleich
TI - Lehrkräftekooperation im Kontext des Lernens und Lehrens mit digitalen Medien
ER -
TY - CHAP
AU - Eickelmann, Birgit
AU - Drossel, Kerstin
AU - Labusch, Amelie
ED - Eickelmann, Birgit
ED - Labusch, Amelie
ED - Drossel, Kerstin
ED - Vennemann, Mario
ID - 27855
T2 - ICILS 2018 #NRW. Vertiefende Analysen und Befunde für Nordrhein-Westfalen im internationalen Vergleich
TI - Schulischer IT-Support: Sichtweisen und Zuständigkeiten
ER -
TY - CHAP
AU - Labusch, Amelie
AU - Eickelmann, Birgit
AU - Drossel, Kerstin
ED - Eickelmann, Birgit
ED - Labusch, Amelie
ED - Drossel, Kerstin
ED - Vennemann, Mario
ID - 27856
T2 - ICILS 2018 #NRW. Vertiefende Analysen und Befunde für Nordrhein-Westfalen im internationalen Vergleich
TI - Schulische IT-Ausstattung und Wahrnehmung der IT-Ausstattungsqualität
ER -
TY - CHAP
AU - Conze, Daniela
AU - Drossel, Kerstin
AU - Eickelmann, Birgit
ED - Kaspar, Kai
ED - Becker-Mrotzek, Michael
ED - Hofhues, Sandra
ED - König, Johannes
ED - Schmeinck, Daniela
ID - 27862
T2 - Bildung, Schule und Digitalisierung
TI - Lehrer*innenbildung in virtuellen Lernnetzwerken – Warum engagieren sich Lehrkräfte im #twitterlehrerzimmer?
ER -
TY - CHAP
AU - Eickelmann, Birgit
AU - Labusch, Amelie
AU - Drossel, Kerstin
AU - Vennemann, Mario
ED - Eickelmann, Birgit
ED - Labusch, Amelie
ED - Drossel, Kerstin
ED - Vennemann, Mario
ID - 27857
T2 - ICILS 2018 #NRW. Vertiefende Analysen und Befunde für Nordrhein-Westfalen im internationalen Vergleich
TI - Anlage der Studie ICILS 2018-NRW
ER -
TY - JOUR
AU - Eickelmann, Birgit
AU - Drossel, Kerstin
ID - 27861
JF - SchulVerwaltung NRW
TI - Schulschließungen und Perspektiven für die Pandemie-Zeit - Ergebnisse der Studie ‚Schule auf Distanz‘
VL - 9
ER -
TY - BOOK
ED - Eickelmann, Birgit
ED - Labusch, Amelie
ED - Drossel, Kerstin
ED - Vennemann, Mario
ID - 27858
TI - ICILS 2018 #NRW. Vertiefende Analysen und Befunde für Nordrhein-Westfalen im internationalen Vergleich
ER -
TY - JOUR
AU - Rezat, Sara
AU - Rezat, Sebastian
ID - 33594
JF - Die Grundschulzeitschrift 320
TI - Schulbücher. Werkzeuge zum Üben in den Fächern Deutsch und Mathematik
ER -
TY - CHAP
AU - Rezat, Sebastian
ED - Meister, Dorothee
ED - Ilka, Mindt
ID - 44688
SN - 2512-112X
T2 - Mobile Medien im Schulkontext
TI - Mathematiklernen mit digitalen Schulbüchern im Spannungsfeld zwischen Individualisierung und Kooperation
ER -
TY - CHAP
AU - Schreckenberg, Stefan
ED - Chihaia, Matei
ED - Henningfeld, Ursula
ID - 44692
T2 - Guernica entre ícono y mito. Productividad y presencia de memorias colectivas
TI - Miradas francesas sobre Gernika y Guernica
ER -
TY - CONF
AU - Gräßler, Iris
AU - Hentze, Julian
AU - Hesse, Philipp
ID - 23523
SN - 978-94-6384-131-
T2 - Proceedings of TMCE Conference 2020
TI - Anchoring Points as a Method for Interdisciplinary Systems Engineering with the New V-Model
ER -
TY - JOUR
AU - Gerhardts, L.
AU - Kamin, A.M.
AU - Meister, Dorothee M.
AU - Richter, L.
AU - Teichert, Jeannine
ID - 44204
IS - 6
JF - PraxisForschungLehrer*innenBildung
TI - Entwicklung von Selbstlern- und Medienkompetenz im Homeschooling – Chancen und konzeptionelle Anforderungen
VL - 2
ER -
TY - JOUR
AU - Gerhardts, L.
AU - Kamin, A.M.
AU - Meister, Dorothee M.
AU - Richter, L.
AU - Teichert, Jeannine
ID - 44203
IS - 2
JF - Medienimpulse
TI - Lernen auf Distanz – Einblicke in den familialen Alltag des Homeschoolings und Formen der Bewältigung
VL - 58
ER -
TY - JOUR
AU - Teichert, Jeannine
ID - 44201
JF - merzWissenschaft
TI - Ich habe auch Facebook-Freunde“ – Erinnerungspraktiken in vergangenen Freundschaften
VL - 6
ER -
TY - JOUR
AU - Lu, You
AU - Luo, Rong
AU - Schubert, Michael
AU - Steffen, Eckhard
AU - Zhang, Cun-Quan
ID - 13114
JF - SIAM J. Discrete Math
TI - Flows on signed graphs without long barbells
VL - 34 (4)
ER -
TY - JOUR
AU - Jin, Ligang
AU - Steffen, Eckhard
ID - 12971
JF - J. of Combinatorics
TI - Unions of 1-factors in r-graphs and overfull graphs
VL - 11
ER -
TY - JOUR
AU - Dreßler, C.
AU - Kabbe, G.
AU - Brehm, Martin
AU - Sebastiani, D.
ID - 44995
JF - J. Chem. Phys.
TI - Exploring Non-Equilibrium Molecular Dynamics of Mobile Protons in the Solid Acid CsH2PO4 on the Micrometer and Microsecond Scale
VL - 152 (16)
ER -
TY - JOUR
AU - Brehm, Martin
AU - Radicke, J.
AU - Pulst, M.
AU - Shaabani, F.
AU - Sebastiani, D.
AU - Kressler, J.
ID - 44997
JF - Molecules
TI - Dissolving Cellulose in 1,2,3-Triazolium- and Imidazolium-Based Ionic Liquids with Aromatic Anions
VL - 25 (15)
ER -
TY - JOUR
AU - Hunold, J.
AU - Eisermann, J.
AU - Brehm, Martin
AU - Hinderberger, D.
ID - 44998
JF - J. Phys. Chem. B
TI - Characterization of Aqueous Lower Polarity Solvation Shells Around Amphiphilic TEMPO Radicals in Water
VL - 124 (39)
ER -
TY - JOUR
AU - Scarbath-Evers, L.
AU - Hammer, R.
AU - Golze, D.
AU - Brehm, Martin
AU - Sebastiani, D.
AU - Widdra, W.
ID - 44993
JF - Nanoscale
TI - From Flat to Tilted: Gradual Interfaces in Organic Thin Film Growth
VL - 12
ER -
TY - JOUR
AU - Dreßler, C.
AU - Kabbe, G.
AU - Brehm, Martin
AU - Sebastiani, D.
ID - 44994
JF - J. Chem. Phys.
TI - Dynamical Matrix Propagator Scheme for Large-Scale Proton Dynamics Simulations
VL - 152 (11)
ER -
TY - JOUR
AU - Weiß, M.
AU - Brehm, Martin
ID - 44999
JF - Molecules
TI - Exploring Free Energy Profiles of Enantioselective Organocatalytic Aldol Reactions under Full Solvent Influence
VL - 25 (24)
ER -
TY - JOUR
AU - Brehm, Martin
AU - Thomas, M.
AU - Gehrke, S.
AU - Kirchner, B.
ID - 44996
JF - J. Chem. Phys.
TI - TRAVIS – A Free Analyzer for Trajectories from Molecular Simulation
VL - 152 (16)
ER -
TY - JOUR
AU - Ditter, Jan
AU - Aubel, Tobias
AU - Meschut, Gerson
ID - 45072
IS - 1
JF - adhesion ADHESIVES + SEALANTS
KW - Polymers and Plastics
KW - General Chemical Engineering
KW - General Chemistry
SN - 2192-2624
TI - Simple Determination of Fast Curing Parameters for Bonded Structures
VL - 17
ER -
TY - JOUR
AU - Ditter, Jan
AU - Meschut, Gerson
AU - Wibbeke, Tim Michael
ID - 45077
IS - 3
JF - adhesion ADHESIVES + SEALANTS
KW - Polymers and Plastics
KW - General Chemical Engineering
KW - General Chemistry
SN - 2192-2624
TI - Joining and Disjoining Concepts for Adhesive Bonded Lightweight Structures
VL - 16
ER -
TY - JOUR
AU - Haines, Mackenzie
AU - Murray, Amanda M.
AU - Glaviano, Neal R.
AU - Gokeler, Alli
AU - Norte, Grant E.
ID - 45125
JF - Human Movement Science
KW - Experimental and Cognitive Psychology
KW - Orthopedics and Sports Medicine
KW - General Medicine
KW - Biophysics
SN - 0167-9457
TI - Restricting ankle dorsiflexion does not mitigate the benefits of external focus of attention on landing biomechanics in healthy females
VL - 74
ER -
TY - JOUR
AB - Abstract
Purpose
It has been reported that there is no correlation between anterior tibia translation (ATT) in passive and dynamic situations. Passive ATT (ATTp) may be different to dynamic ATT (ATTd) due to muscle activation patterns. This study aimed to investigate whether muscle activation during jumping can control ATT in healthy participants.
Methods
ATTp of twenty-one healthy participants was measured using a KT-1000 arthrometer. All participants performed single leg hops for distance during which ATTd, knee flexion angles and knee flexion moments were measured using a 3D motion capture system. During both tests, sEMG signals were recorded.
Results
A negative correlation was found between ATTp and the maximal ATTd (r = − 0.47, p = 0.028). An N-Way ANOVA showed that larger semitendinosus activity was seen when ATTd was larger, while less biceps femoris activity and rectus femoris activity were seen. Moreover, larger knee extension moment, knee flexion angle and ground reaction force in the anterior-posterior direction were seen when ATTd was larger.
Conclusion
Participants with more ATTp showed smaller ATTd during jump landing. Muscle activation did not contribute to reduce ATTd during impact of a jump-landing at the observed knee angles. However, subjects with large ATTp landed with less knee flexion and consequently showed less ATTd. The results of this study give information on how healthy people control knee laxity during jump-landing.
Level of evidence
III
AU - Keizer, Michèle N. J.
AU - Hijmans, Juha M.
AU - Gokeler, Alli
AU - Benjaminse, Anne
AU - Otten, Egbert
ID - 45126
IS - 1
JF - Journal of Experimental Orthopaedics
KW - Orthopedics and Sports Medicine
SN - 2197-1153
TI - Healthy subjects with lax knees use less knee flexion rather than muscle control to limit anterior tibia translation during landing
VL - 7
ER -
TY - JOUR
AB - Abstract
Purpose
An increased posterior tibia plateau angle is associated with increased risk for anterior cruciate ligament injury and re-rupture after reconstruction. The aims of this study were to determine whether the tibia plateau angle correlates with dynamic anterior tibia translation (ATT) after an anterior cruciate ligament reconstruction and whether the tibia plateau angle correlates with aspects of knee kinematics and kinetics during jump landing.
Methods
Thirty-seven patients after anterior cruciate ligament reconstruction with autograft hamstring tendon were included. Knee flexion angle and knee extension moment during single leg hops for distance were determined using a motion capture system and the dynamic ATT with its embedded method. The medial and lateral posterior tibia plateau angle were measured using MRI. Moreover, passive ATT was measured using the KT-1000 arthrometer.
Results
A weak negative correlation was found between the maximal dynamic ATT and the medial tibia plateau angle (p = 0.028, r = − 0.36) and between the maximal knee flexion angle and the lateral tibia plateau angle (p = 0.025, r = − 0.37) during landing. Patients with a smaller lateral tibia plateau angle show larger maximal knee flexion angle during landing than the patients with larger lateral tibia plateau angle. Also, the lateral tibia plateau angle is associated the amount of with muscle activity.
Conclusion
The posterior medical tibia plateau angle is associated with dynamic ATT. The maximal knee flexion angle and muscle activity are associated with the posterior lateral tibia plateau angle.
Level of evidence
III
AU - Keizer, Michèle N. J.
AU - Hijmans, Juha M.
AU - Gokeler, Alli
AU - Otten, Egbert
AU - Brouwer, Reinoud W.
ID - 45127
IS - 1
JF - Journal of Experimental Orthopaedics
KW - Orthopedics and Sports Medicine
SN - 2197-1153
TI - Sagittal knee kinematics in relation with the posterior tibia slope during jump landing after an anterior cruciate ligament reconstruction
VL - 7
ER -
TY - JOUR
AU - Letafatkar, Amir
AU - Rabiei, Pouya
AU - Ghanati, Hadi Abbaszadeh
AU - Khosrokiani, Zohre
AU - Ghahremani, Naji
AU - Gokeler, Alli
ID - 45128
IS - 4
JF - Sport Sciences for Health
KW - Orthopedics and Sports Medicine
SN - 1824-7490
TI - Training athletes with an external attentional focus enhances athletic performance during countermovement jump
VL - 16
ER -
TY - GEN
AU - N., N.
ID - 42307
TI - Weitsichtigkeit zur Bildung stabiler Koalitionen - eine spieltheoretische Analyse
ER -
TY - GEN
AU - N., N.
ID - 42308
TI - Verhandeltes strategisches Verhalten
ER -