TY - JOUR
AB - Employing the ultrafast control of electronic states of a semiconductor quantum dot in a cavity, we introduce an approach to achieve on-demand emission of single photons with almost perfect indistinguishability and photon pairs with near ideal entanglement. Our scheme is based on optical excitation off resonant to a cavity mode followed by ultrafast control of the electronic states using the time-dependent quantum-confined Stark effect, which then allows for cavity-resonant emission. Our theoretical analysis considers cavity-loss mechanisms, the Stark effect, and phonon-induced dephasing, allowing realistic predictions for finite temperatures.
AU - Bauch, David
AU - Heinze, Dirk Florian
AU - Förstner, Jens
AU - Jöns, Klaus
AU - Schumacher, Stefan
ID - 23816
JF - Physical Review B
KW - tet_topic_qd
SN - 2469-9950
TI - Ultrafast electric control of cavity mediated single-photon and photon-pair generation with semiconductor quantum dots
VL - 104
ER -
TY - JOUR
AB - AbstractA detailed investigation of the energy levels of perylene-3,4,9,10-tetracarboxylic tetraethylester as a representative compound for the whole family of perylene esters was performed. It was revealed via electrochemical measurements that one oxidation and two reductions take place. The bandgaps determined via the electrochemical approach are in good agreement with the optical bandgap obtained from the absorption spectra via a Tauc plot. In addition, absorption spectra in dependence of the electrochemical potential were the basis for extensive quantum-chemical calculations of the neutral, monoanionic, and dianionic molecules. For this purpose, calculations based on density functional theory were compared with post-Hartree–Fock methods and the CAM-B3LYP functional proved to be the most reliable choice for the calculation of absorption spectra. Furthermore, spectral features found experimentally could be reproduced with vibronic calculations and allowed to understand their origins. In particular, the two lowest energy absorption bands of the anion are not caused by absorption of two distinct electronic states, which might have been expected from vertical excitation calculations, but both states exhibit a strong vibronic progression resulting in contributions to both bands.
AU - Wiebeler, Christian
AU - Vollbrecht, Joachim
AU - Neuba, Adam
AU - Kitzerow, Heinz-Siegfried
AU - Schumacher, Stefan
ID - 39653
IS - 1
JF - Scientific Reports
KW - Multidisciplinary
SN - 2045-2322
TI - Unraveling the electrochemical and spectroscopic properties of neutral and negatively charged perylene tetraethylesters
VL - 11
ER -
TY - JOUR
AU - Klement, Philip
AU - Dehnhardt, Natalie
AU - Dong, Chuan-Ding
AU - Dobener, Florian
AU - Bayliff, Samuel
AU - Winkler, Julius
AU - Hofmann, Detlev M.
AU - Klar, Peter J.
AU - Schumacher, Stefan
AU - Chatterjee, Sangam
AU - Heine, Johanna
ID - 40434
IS - 23
JF - Advanced Materials
KW - Mechanical Engineering
KW - Mechanics of Materials
KW - General Materials Science
SN - 0935-9648
TI - Atomically Thin Sheets of Lead‐Free 1D Hybrid Perovskites Feature Tunable White‐Light Emission from Self‐Trapped Excitons
VL - 33
ER -
TY - JOUR
AU - Barkhausen, Franziska
AU - Pukrop, Matthias
AU - Schumacher, Stefan
AU - Ma, Xuekai
ID - 21359
IS - 7
JF - Physical Review B
SN - 2469-9950
TI - Structuring coflowing and counterflowing currents of polariton condensates in concentric ring-shaped and elliptical potentials
VL - 103
ER -
TY - JOUR
AU - Franz, Martin
AU - Chandola, Sandhya
AU - Koy, Maximilian
AU - Zielinski, Robert
AU - Aldahhak, Hazem
AU - Das, Mowpriya
AU - Freitag, Matthias
AU - Gerstmann, Uwe
AU - Liebig, Denise
AU - Hoffmann, Adrian Karl
AU - Rosin, Maximilian
AU - Schmidt, Wolf Gero
AU - Hogan, Conor
AU - Glorius, Frank
AU - Esser, Norbert
AU - Dähne, Mario
ID - 24975
JF - Nature Chemistry
SN - 1755-4330
TI - Controlled growth of ordered monolayers of N-heterocyclic carbenes on silicon
ER -
TY - JOUR
AB - Density-functional theory within a Berry-phase formulation of the dynamical polarization is used to determine the second-order susceptibility χ(2) of lithium niobate (LiNbO3). Defect trapped polarons and bipolarons are found to strongly enhance the nonlinear susceptibility of the material, in particular if localized at NbV–VLi defect pairs. This is essentially a consequence of the polaronic excitation resulting in relaxation-induced gap states. The occupation of these levels leads to strongly enhanced χ(2) coefficients and allows for the spatial and transient modification of the second-harmonic generation of macroscopic samples.
AU - Kozub, Agnieszka L.
AU - Schindlmayr, Arno
AU - Gerstmann, Uwe
AU - Schmidt, Wolf Gero
ID - 23418
JF - Physical Review B
SN - 2469-9950
TI - Polaronic enhancement of second-harmonic generation in lithium niobate
VL - 104
ER -
TY - CONF
AU - Rose, Hendrik
AU - Paul, Jagannath
AU - Wahlstrand, Jared K.
AU - Bristow, Alan D.
AU - Meier, Torsten
ED - Betz, Markus
ED - Elezzabi, Abdulhakem Y.
ID - 23475
T2 - Ultrafast Phenomena and Nanophotonics XXV
TI - Theoretical analysis and simulations of two-dimensional Fourier transform spectroscopy performed on exciton-polaritons of a quantum-well microcavity system
VL - 11684
ER -
TY - JOUR
AU - Krauss-Kodytek, L.
AU - Hannes, W.-R.
AU - Meier, Torsten
AU - Ruppert, C.
AU - Betz, M.
ID - 37333
IS - 8
JF - Physical Review B
SN - 2469-9950
TI - Nondegenerate two-photon absorption in ZnSe: Experiment and theory
VL - 104
ER -
TY - JOUR
AU - Riabinin, Matvei
AU - Sharapova, Polina
AU - Bartley, Tim
AU - Meier, Torsten
ID - 21547
IS - 4
JF - Journal of Physics Communications
SN - 2399-6528
TI - Generating two-mode squeezing with multimode measurement-induced nonlinearity
VL - 5
ER -
TY - JOUR
AU - Krauss-Kodytek, L.
AU - Hannes, Wolf-Rüdiger
AU - Meier, Torsten
AU - Ruppert, C.
AU - Betz, M.
ID - 23472
IS - 8
JF - Physical Review B
SN - 2469-9950
TI - Nondegenerate two-photon absorption in ZnSe: Experiment and theory
VL - 104
ER -
TY - CONF
AU - Moritzer, Elmar
AU - Flachmann, Felix
ID - 26390
T2 - PPS-36 Proceedings
TI - Process-reliable Injection Molding of Highly Filled Wood-Plastic-Composites (WPC)
ER -
TY - JOUR
AU - Teichert, Jeannine
ID - 44200
IS - 1
JF - Networking Knowledge
TI - Mediating close friendship intimacy in times of (social) distance
VL - 14
ER -
TY - JOUR
AU - Grabo, Matti
AU - Acar, Emre
AU - Kenig, Eugeny
ID - 22265
JF - Renewable Energy
SN - 0960-1481
TI - Modeling and improvement of a packed bed latent heat storage filled with non-spherical encapsulated PCM-Elements
VL - 173
ER -
TY - CONF
AU - Rostek, Tim
AU - Makeieva, Hanna
AU - Homberg, Werner
ED - Daehn, G.
ED - Cao, J.
ED - Kinsey, B.
ED - Tekkaya, A. E.
ED - Vivek, A.
ED - Yoshida, Y
ID - 21477
SN - 978-3-030-75380-1
T2 - Proceedings of the 13th International Conference on the Technology of Plasticity
TI - Cutting Blades for Food Processing Applications Manufactured Using Innovative Spin Forming
ER -
TY - JOUR
AB - The predictive quality of numerical simulations for mechanical joining processes depends on the implemented material model, especially regarding the plasticity of the joining parts. Therefore, experimental material characterization processes are conducted to determine the material properties of sheet metal and generate flow curves. In this regard, there are a number of procedures which are accompanied by varying experimental efforts. This paper presents various methods of determining flow curves for HCT590X as well as EN AW-6014, including varying specimen geometries and diverse hardening laws for extrapolation procedures. The flow curves thus generated are compared considering the variety of plastic strains occurring in mechanical joining processes. The material data generated are implemented in simulation models for the joining technologies, clinching and self-piercing riveting. The influence of the varied methods on the predictive accuracy of the simulation model is analysed. The evaluation of the differing flow curves is achieved by comparing the geometric formation of the joints and the required joining forces of the processes with experimentally investigated joints.
AU - Böhnke, Max
AU - Kappe, Fabian
AU - Bobbert, Mathias
AU - Meschut, Gerson
ID - 22798
IS - 6
JF - Materials Testing
SN - 2195-8572
TI - Influence of various procedures for the determination of flow curves on the predictive accuracy of numerical simulations for mechanical joining processes
VL - 63
ER -
TY - JOUR
AB - The increasing use of multi-material constructions lead to a continuous increase in the use of mechanical joining techniques due to the wide range of joining possibilities as well as the high load-bearing capacities of the joints. Nevertheless, the currently rigid tool systems are not able to react to changing boundary conditions, like changing the material-geometry-combination. Therefore research work is crucial with regard to versatile joining systems. In this paper, a new approach for a versatile self-piercing riveting process considering the joining system as well as the auxiliary joining part is presented.
AU - Kappe, Fabian
AU - Bobbert, Mathias
AU - Meschut, Gerson
ID - 34226
JF - Key Engineering Materials
KW - Mechanical Engineering
KW - Mechanics of Materials
KW - General Materials Science
SN - 1662-9795
TI - New Approach for Versatile Self Piercing Riveting: Joining System and Auxiliary Part
VL - 883
ER -
TY - JOUR
AU - Wituschek, Simon
AU - Kappe, Fabian
AU - Lechner, Michael
ID - 30200
JF - Production Engineering
TI - Investigation of the influence of varying tumbling strategies on a tumbling self-piercing riveting process
ER -
TY - CHAP
AU - Dahms, Frederik
AU - Homberg, Werner
ID - 22766
SN - 2367-1181
T2 - Forming the Future
TI - Investigations and Improvements in 3D-DIC Optical Residual Stress Analysis—A New Temperature Compensation Method
ER -
TY - JOUR
AB - The increase of the thermal conductivity of PUR foam in the insulation of the cabinet is an important cause for aging processes of household refrigerating appliances. To determine the influence of the PUR foam aging on energy consumption, the development of a new measurement method is necessary be- cause current methods influence the aging behavior of household refrigerators and are therefore not applicable in general. Based on a latent heat sink, constructed as an ice water bucket, a new measure- ment method is developed to determine the k ·A value over time. With this method, the k ·A value of four household refrigerating appliances was determined over an interval of 14 months. The k ·A value increased between 3.6% and 11.5% during this period.
AU - Paul, Andreas
AU - Baumhögger, Elmar
AU - Elsner, Andreas
AU - Moczarski, Lukas
AU - Reineke, Michael
AU - Sonnenrein, Gerrit
AU - Hueppe, Christian
AU - Stamminger, Rainer
AU - Hoelscher, Heike
AU - Wagner, Hendrik
AU - Gries, Ulrich
AU - Freiberger, Alfred
AU - Becker, Wolfgang
AU - Vrabec, Jadran
ID - 20921
JF - International Journal of Refrigeration
SN - 0140-7007
TI - Determining the heat flow through the cabinet walls of household refrigerating appliances
ER -
TY - JOUR
AB - Domestic refrigeration appliances are standard household commodities. Although policies, such as the energy labelling, prompted technical improvements and decreased appliance energy consumption throughout recent decades, important parameters were disregarded. These refer to the efficiency loss over time and the consumer behaviour. The objective of this contribution was to develop a dynamic energy model to determine the power consumption of refrigeration appliances considering degradation factors and behaviour. These were included by model parameters for direct consumer interactions, such as the storage behaviour, door openings and temperature setting, as well as indirect actions, e.g. exposing an appliance to specific temperature conditions at an installation site. For this, an online-survey was conducted to evaluate the consumer behaviour. A total of 706 consumers participated in the national questionnaire, serving as input for the dynamic energy model. It was found that the efficiency loss increases the power consumption by at least 1% annually, leading to an excess of 10% after 10 years of usage. Another important finding was that 32.5% of appliance’s power consumption results from consumer behaviour, whereas the promotion of behavioural changes leads to a significant decrease of the consumer-induced consumption. Consequently, this study provides a tool to evaluate the impact of policies targeting refrigeration appliances, stressing that efficiency loss and behaviour should be integrated into future policy approaches.
AU - Hueppe, Christian
AU - Geppert, Jasmin
AU - Moenninghoff-Juessen, Julia
AU - Wolff, Lena
AU - Stamminger, Rainer
AU - Paul, Andreas
AU - Elsner, Andreas
AU - Vrabec, Jadran
AU - Wagner, Hendrik
AU - Hoelscher, Heike
AU - Becker, Wolfgang
AU - Gries, Ulrich
AU - Freiberger, Alfred
ID - 27290
JF - Energy Policy
SN - 0301-4215
TI - Investigating the real life energy consumption of refrigeration appliances in Germany: Are present policies sufficient?
ER -
TY - CONF
AU - Jende, Yvonne Kristin
ID - 44222
T2 - The Place of Memory and the Memory of Place, International Conference
TI - Crossraods of Collective Memory. Canadian Memoir at the Junction of lieux and nœuds de mémoire.
ER -
TY - CONF
AU - Jende, Yvonne Kristin
ID - 44221
T2 - Bridges and Barriers: Perspectives of Progress and Preservation, Interdisciplinary and International Conference
TI - Truth Be Told, ... or Not? Reality and Perspective in New Sincerity Memoir.
ER -
TY - CONF
AB - The online fitting of a microscopic traffic simulation model to reconstruct the current state of a real traffic
area can be challenging depending on the provided data. This paper presents a novel method based on limited
data from sensors positioned at specific locations and guarantees a general accordance of reality and
simulation in terms of multimodal road traffic counts and vehicle speeds. In these considerations, the actual
purpose of research is of particular importance. Here, the research aims at improving the traffic flow by
controlling the Traffic Light Systems (TLS) of the examined area which is why the current traffic state and
the route choices of individual road users are the matter of interest. An integer optimization problem is derived
to fit the current simulation to the latest field measurements. The concept can be transferred to any road traffic
network and results in an observation of the current multimodal traffic state matching at the given sensor
position. First case studies show promosing results in terms of deviations between reality and simulation.
AU - Malena, Kevin
AU - Link, Christopher
AU - Mertin, Sven
AU - Gausemeier, Sandra
AU - Trächtler, Ansgar
ID - 24159
KW - Microscopic Traffic Simulation
KW - Online State Estimation
KW - Mixed Road Users
KW - Sensor Fusion
KW - Integer Programming
KW - Route Choice
KW - Vehicle2Infrastructure
SN - 978-989-758-513-5
T2 - VEHITS 2021 Proceedings of the 7th International Conference on Vehicle Technology and Intelligent Transport Systems
TI - Online State Estimation for Microscopic Traffic Simulations using Multiple Data Sources*
VL - 7
ER -
TY - GEN
AU - Berger, Thilo Frederik
ID - 44234
TI - Combining Mobility, Heterogeneity, and Leasing Approaches for Online Resource Allocation
ER -
TY - GEN
AU - Pranger, Sebastian
ID - 44233
TI - Online k-Facility Reallocation using k-Server Algorithms
ER -
TY - JOUR
AU - Camberg, Alan Adam
AU - Andreiev, Anatolii
AU - Pramanik, Sudipta
AU - Hoyer, Kay-Peter
AU - Tröster, Thomas
AU - Schaper, Mirko
ID - 41508
JF - Materials Science and Engineering: A
KW - Mechanical Engineering
KW - Mechanics of Materials
KW - Condensed Matter Physics
KW - General Materials Science
SN - 0921-5093
TI - Strength enhancement of AlMg sheet metal parts by rapid heating and subsequent cold die stamping of severely cold-rolled blanks
VL - 831
ER -
TY - CONF
AU - Behler, Felix
AU - Ines, Böker
ID - 44256
T2 - Sommerschule 21: Aktuelle Perspektiven der Deutsch-Türkischen und Interkulturellen Germanistik im Rahmen der Germanistischen Institutspartnerschaft 'Pader-EgeBosporus'. Organisation: Dr. Swen Schulte Eickholt, Nina Weigel (University of Paderborn), gefördert durch den DAAD.
TI - Nationale Identität, Repräsentationen und Transformationen von Held*innentum in der Literatur
ER -
TY - CONF
AU - Behler, Felix
ID - 44251
T2 - 4th Trauma and Nightmare International Interdisciplinary Conference. Organisation: Professor Wojciech Owczarski (University of Gdańsk), Professor Paulo Endo (University of São Paulo), Lidia Owczarski (InMind Support)
TI - 'I wasn’t there so I can’t know, can I?’ – An Analysis of Transgenerational and Collective Trauma in Solmaz Sharif’s Look (2016)
ER -
TY - CONF
AU - Behler, Felix
ID - 44248
T2 - Bridges and Barriers, Interdisziplinäre studentische Konferenz. Organisation: Felix Behler, Yvonne K. Jende, Lisa-Marie Büsken, Cecilie Rasmussen (University of Paderborn)
TI - Approaching Barriers of Representation: Speaking Trauma through Verse
ER -
TY - CONF
AU - Behler, Felix
ID - 44254
T2 - Cosmopolitanism and World Citizenship International Conference. Organisation: London Centre for Interdisciplinary Research
TI - Toward New Heroism: Post-Modern Military Heroes In Between National and Cosmopolitan Telos
ER -
TY - CONF
AU - Behler, Felix
ID - 44255
T2 - Barockwerkstatt 2021. Organisation: Professor Sabine Meine (Hochschule für Musik und Tanz Köln)
TI - The Battle for the English Landscape’ - Über die gedankliche Konzeptionierung des Englischen Landschaftsgartens
ER -
TY - CONF
AU - Behler, Felix
ID - 44253
T2 - Somewhere In Between: Borders and Borderlands. Organisation: London Centre for Interdisciplinary Research
TI - Of Transgenerational Borders and Collective Trauma
ER -
TY - CONF
AU - Behler, Felix
ID - 44252
T2 - Faces of War International Conference. Organisation: London Centre for Interdisciplinary Research.
TI - Representations of Trauma in Contemporary British War Poetry
ER -
TY - CONF
AU - Behler, Felix
ID - 44257
T2 - BRITCULT 2021: Investigating the Super-Rich. Organisation: Professor Oliver v. Knebel Doeberitz, Dr. Jonatan Jalle Steller (University of Leipzig)
TI - In Between Cultural Heritage and ‘Playground’ for the Wealthy: The Evolution of the British Countryside
ER -
TY - GEN
ED - Behler, Felix
ED - Jende, Yvonne Kristin
ED - Büsken, Lisa-Marie
ED - Rasmussen, Cecilie
ID - 44263
TI - Bridges and Barriers, Interdisziplinäre studentische Konferenz
ER -
TY - CONF
AU - Göddecke, Johannes
AU - Meschut, Gerson
ID - 22264
T2 - 11. Doktorandenseminar Klebtechnik
TI - Experimentelle Untersuchung der Dämpfungseigenschaften geklebter Strukturen unter dynamischer Beanspruchung
ER -
TY - CHAP
AB - Self-piercing riveting is an established technique for joining multi-material structures in car body manufacturing. Rivets for self-piercing riveting differ in their geometry, the material used, the condition of the material and their surface condition. To shorten the manufacturing process by omitting the heat treatment and the coating process, the authors have elaborated a concept for the use of stainless steel with high strain hardening as a rivet material. The focus of the present investigation is on the evaluation of the influences of the rivet’s geometry and material on its deformation behaviour. Conventional rivets of types P and HD2, a rivet with an improved geometry made of treatable steel 38B2, and rivets made of the stainless steels 1.3815 and 1.4541 are examined. The analysis is conducted by means of multi-step joining tests for two material combinations comprising high-strength steel HCT70X and aluminium EN AW-5083. The joints are cut to provide a cross-section and the deformation behaviour of the different rivets is analysed on the basis of the measured changes in geometry and hardness. In parallel, an examination of the force-stroke curves provides further insights. It can be demonstrated that, besides the geometry, the material strength, in particular, has a significant influence on the deformation behaviour of the rivet. The strength of steel 1.4541 is seen to be too low for the joining task, while the strength of steel 1.3815 is sufficient, and hence the investigation confirms the capability of rivets made of 1.3815 for joining even challenging material combinations.
AU - Uhe, Benedikt
AU - Kuball, Clara-Maria
AU - Merklein, Marion
AU - Meschut, Gerson
ED - Daehn, Glenn
ED - Cao, Jian
ED - Kinsey, Brad
ED - Tekkaya, Erman
ED - Vivek, Anupam
ED - Yoshida, Yoshinori
ID - 22930
KW - Self-piercing riveting
KW - Lightweight design
KW - Deformation behaviour
KW - Stainless steel
KW - High nitrogen steel
T2 - Forming the Future - Proceedings of the 13th International Conference on the Technology of Plasticity. The Minerals, Metals & Materials Series.
TI - Self-Piercing Riveting Using Rivets Made of Stainless Steel with High Strain Hardening
ER -
TY - CONF
AB - The use of high-strength steel and aluminium is rising due to the intensified efforts being made in lightweight design, and self-piercing riveting is becoming increasingly important. Conventional rivets for self-piercing riveting differ in their geometry, the material used, the condition of the material and the coating. To shorten the manufacturing process, the use of stainless steel with high strain hardening as the rivet material represents a promising approach. This allows the coating of the rivets to be omitted due to the corrosion resistance of the material and, since the strength of the stainless steel is achieved by cold forming, heat treatment is no longer required. In addition, it is possible to adjust the local strength within the rivet. Because of that, the authors have elaborated a concept for using high nitrogen steel 1.3815 as the rivet material. The present investigation focusses on the joint strength in order to evaluate the capability of rivets in high nitrogen steel by comparison to conventional rivets made of treatable steel. Due to certain challenges in the forming process of the high nitrogen steel rivets, deviations result from the targeted rivet geometry. Mainly these deviations cause a lower joint strength with these rivets, which is, however, adequate. All in all, the capability of the new rivet is proven by the results of this investigation.
AU - Uhe, Benedikt
AU - Kuball, Clara-Maria
AU - Merklein, Marion
AU - Meschut, Gerson
ID - 22274
KW - Self-piercing Riveting
KW - Joining Technology
KW - Rivet Geometry
KW - Rivet Material
KW - High Nitrogen Steel
KW - Joint Strength
TI - Strength of self-piercing riveted Joints with conventional Rivets and Rivets made of High Nitrogen Steel
ER -
TY - JOUR
AB - The number of multi-material joints is increasing as a result of lightweight design. Self-piercing riveting (SPR) is an important mechanical joining technique for multi-material structures. Rivets for SPR are coated to prevent corrosion, but this coating also influences the friction that prevails during the joining process. The aim of the present investigation is to evaluate this influence. The investigation focuses on the common rivet coatings Almac® and zinc-nickel with topcoat as well as on uncoated rivet surfaces. First of all, the coating thickness and the uniformity of the coating distribution are analysed. Friction tests facilitate the classification of the surface properties. The influence of the friction on the characteristic joint parameters and the force-stroke curves is analysed by means of experimental joining tests. More in-depth knowledge of the effects that occur is achieved through the use of numerical simulation. Overall, it is shown that the surface condition of the rivet has an impact on the friction during the joining process and on the resulting joint. However, the detected deviations between different surface conditions do not restrict the operational capability of SPR and the properties of uncoated rivet surfaces, in particular, are similar to those of Almac®-coated rivets. It can thus be assumed that SPR with respect to the joining process is also possible without rivet coating in principle.
AU - Uhe, Benedikt
AU - Kuball, Clara-Maria
AU - Merklein, Marion
AU - Meschut, Gerson
ID - 22272
JF - Key Engineering Materials
KW - Coating
KW - Friction
KW - Joining
TI - Influence of the Rivet Coating on the Friction during Self-Piercing Riveting
VL - 883
ER -
TY - GEN
AU - Kuball, Clara-Maria
AU - Uhe, Benedikt
AU - Meschut, Gerson
AU - Merklein, Marion
ID - 30845
TI - Selective application of different forming temperatures for individual process stages in a rivet manufacturing process with high nitrogen steel
ER -
TY - JOUR
AB - The mechanical properties of joined structures are determined considerably by the chosen joining technology. With the aim of providing a method that enables a faster and more profound decision-making in the spatial distribution of joining points during product development, a new method for the load path analysis of joining points is presented. For an exemplary car body, the load type in the joining elements, i.e. pure tensile, shear and combined tensile-shear loads, is determined using finite element analysis (FEA). Based on the evaluated loads, the resulting load paths in selected joining points are analyzed using a 2D FE-model of a clinching point. State of the art methods for load path analysis are dependent on the selected coordinate system or the existing stress state. Thus, a general statement about the load transmission path is not possible at this time. Here, a novel method for the analysis of load paths is used, which is independent of the alignment of the analyzed geometry. The basic assumption of the new load path analysis method was confirmed by using a simple specimen with a square hole in different orientations. The results presented here show a possibility to display the load transmission path invariantly. In further steps, the method will be extended for 3D analysis and the investigation of more complex assemblies. The primary goal of this methodical approach is an even load distribution over the joining elements and the component. This will provide a basis for future design approaches aimed at reducing the number of joining elements in joined structures.
AU - Steinfelder, Christian
AU - Martin, Sven
AU - Brosius, Alexander
AU - Tröster, Thomas
ID - 24541
JF - Key Engineering Materials
SN - 1662-9795
TI - Load Path Transmission in Joining Elements
ER -
TY - JOUR
AU - Martin, Sven
AU - Tröster, Thomas
ID - 24548
JF - ESAFORM 2021
TI - Joint point loadings in car bodies – the influence of manufacturing tolerances and scatter in material properties
ER -
TY - CONF
AU - Stallmeister, Tim
AU - Martin, Sven
AU - Marten, Thorsten
AU - Tröster, Thomas
ID - 26994
TI - Experimental investigation on lightweight potentials of fiber-metal-laminates for automotive battery cases
ER -
TY - CONF
AU - Dörner, Marius
AU - Schöppner, Volker
ID - 23835
T2 - ANTEC 21
TI - Development of an Analytical Mathematical Modelling Approach for a More Precise Description of Disperse Melting in Solid Bed Breaking Screw Concepts
ER -
TY - JOUR
AU - Moritzer, Elmar
AU - Richters, Maximilian
ID - 31769
IS - 12
JF - Journal of Composites Science
SN - 2504-477X
TI - Injection Molding of Wood-Filled Thermoplastic Polyurethane
ER -
TY - JOUR
AU - Moritzer, Elmar
AU - Krassmann, Dimitri
ID - 31757
JF - Welding in the World
TI - Development of a new joining technology for hybrid joints of sheet metal and continuous fiber-reinforced thermoplastics
ER -
TY - CONF
AU - Rozo Vasquez, Julian
AU - Arian, Bahman
AU - Riepold, Markus
AU - Walther, Frank
AU - Homberg, Werner
AU - Trächtler, Ansgar
ID - 30297
T2 - Proceedings of the 11th International Workshop NDT in Progress
TI - Magnetic Barkhausen noise analysis for microstructural effects separation during flow forming of metastable austenite 304L.
ER -
TY - CONF
AB - One of the main objectives of production engineering is to reproducibly manufacture (complex) defect-free parts. To achieve this, it is necessary to employ an appropriate process or tool design. While this will generally prove successful, it cannot, however, offset stochastic defects with local variations in material properties. Closed-loop process control represents a promising approach for a solution in this context. The state of the art involves using this approach to control geometric parameters such as a length. So far, no research or applications have been conducted with closed-loop control for microstructure and product properties. In the project on which this paper is based, the local martensite content of parts is to be adjusted in a highly precise and reproducible manner. The forming process employed is a special, property-controlled flow-forming process. A model-based controller is thus to generate corresponding correction values for the tool-path geometry and tool-path velocity on the basis of online martensite content measurements. For the controller model, it is planned to use a special process or microstructure (correlation) model. The planned paper not only describes the experimental setup but also presents results of initial experimental investigations for subsequent use in the closed-loop control of α’-martensite content during flow-forming.
AU - Arian, Bahman
AU - Homberg, Werner
AU - Riepold, Markus
AU - Trächtler, Ansgar
AU - Rozo Vasquez, Julian
AU - Walther, Frank
ID - 23465
KW - Flow-forming
KW - Spinning
KW - Process Strategy
KW - Martensite Content
KW - Property Control
KW - Micromagnetic Measurement
KW - Metastable Austenitic Stainless Steel
SN - 978-2-87019-302-0
TI - Forming of metastable austenitic stainless steel tubes with axially graded martensite content by flow-forming
ER -
TY - CHAP
AU - Ahrens, Stephan
ED - Jakob, Reinhard
ID - 44367
T2 - Lichtspiele. Kino und Film im Brucker Land von den Anfängen bis zum Siegeszug des Fernsehens.
TI - Francesco (Franz) Stefani - Ein Regisseur mit barocken Anklägen.
ER -
TY - JOUR
AB - AbstractIn child–robot interaction (cHRI) research, many studies pursue the goal to develop interactive systems that can be applied in everyday settings. For early education, increasingly, the setting of a kindergarten is targeted. However, when cHRI and research are brought into a kindergarten, a range of ethical and related procedural aspects have to be considered and dealt with. While ethical models elaborated within other human–robot interaction settings, e.g., assisted living contexts, can provide some important indicators for relevant issues, we argue that it is important to start developing a systematic approach to identify and tackle those ethical issues which rise with cHRI in kindergarten settings on a more global level and address the impact of the technology from a macroperspective beyond the effects on the individual. Based on our experience in conducting studies with children in general and pedagogical considerations on the role of the institution of kindergarten in specific, in this paper, we enfold some relevant aspects that have barely been addressed in an explicit way in current cHRI research. Four areas are analyzed and key ethical issues are identified in each area: (1) the institutional setting of a kindergarten, (2) children as a vulnerable group, (3) the caregivers’ role, and (4) pedagogical concepts. With our considerations, we aim at (i) broadening the methodology of the current studies within the area of cHRI, (ii) revalidate it based on our comprehensive empirical experience with research in kindergarten settings, both laboratory and real-world contexts, and (iii) provide a framework for the development of a more systematic approach to address the ethical issues in cHRI research within kindergarten settings.
AU - Tolksdorf, Nils Frederik
AU - Siebert, Scarlet
AU - Zorn, Isabel
AU - Horwath, Ilona
AU - Rohlfing, Katharina J.
ID - 24901
JF - International Journal of Social Robotics
SN - 1875-4791
TI - Ethical Considerations of Applying Robots in Kindergarten Settings: Towards an Approach from a Macroperspective
ER -
TY - JOUR
AU - Chormey, Dotse Selali
AU - Tonbul, Güldeniz
AU - Soylu, Güneş
AU - Saygılar, Ahmet
AU - Bakırdere, Sezgin
ID - 44375
IS - 2
JF - Analytical Letters
KW - Dispersive liquid-liquid microextraction (DLLME)
KW - gas chromatography – mass spectrometry (GC-MS)
KW - polycyclic aromatic hydrocarbons
KW - QuEChERS
SN - 0003-2719
TI - Determination of Four Priority Polycyclic Aromatic Hydrocarbons in Food Samples by Gas Chromatography – Mass Spectrometry (GC-MS) after Vortex Assisted Dispersive Liquid-Liquid Microextraction (DLLME)
VL - 55
ER -
TY - GEN
AU - Ahrens, Stephan
ID - 44386
T2 - In: Filmblatt 25:73/74
TI - Hermann Kappelhoff, Christine Lötscher, Daniel Illger (Hg.): Filmische Seitenblicke. Cinepoetische Exkursionen ins Kino von 1968. Berlin, Bosten: De Gruyter 2018
ER -
TY - GEN
AU - Ahrens, Stephan
ID - 44381
T2 - In: Filmblatt 25:73/74
TI - Christina Gerhardt, Marco Abel (Hg.): Celluloid Revolt. German Screen Cultures and the Long 1968. Rochester: Camden House 2019
ER -
TY - GEN
AU - Ahrens, Stephan
ID - 44392
T2 - Kinema Kommunal, Nummer 2, Juni 2021
TI - Sammler und Beobachter. Das Programm der diesjährigen Internationalen Kurzfilmtage Oberhausen, Dschungel (jungle World)
ER -
TY - GEN
AU - Ahrens, Stephan
ID - 44391
T2 - In: Filmdienst, 24.08.2021
TI - Guy Gilles und das Kino der Entwurzelung
ER -
TY - GEN
AU - Ahrens, Stephan
ID - 44426
TI - Biografie Cox Habbema
ER -
TY - GEN
AU - Ahrens, Stephan
ID - 44431
TI - Biografie Peter Rabenalt
ER -
TY - CHAP
AU - Bruckner, Franziska
AU - Eckel, Julia
AU - Feyersinger, Erwin
AU - Freisleben-Teutscher, Christian F.
AU - Ohnmacht, Tina
ED - Bruckner, Franziska
ED - Hagler, Jürgen
ED - Lang, Holger
ED - Reinert, Maike Sarah
ID - 44466
T2 - In Wirklichkeit Animation …
TI - Bilden mit/zu Animation
ER -
TY - CHAP
AU - Eckel, Julia
ED - Bruckner, Franziska
ED - Hagler, Jürgen
ED - Lang, Holger
ED - Reinert, Maike Sarah
ID - 44465
T2 - In Wirklichkeit Animation ...
TI - Tech Demo/Tech Doku. Zur Wirklichkeit des Animierens
ER -
TY - CHAP
AU - Eckel, Julia
ED - Kreuzer, Stefanie
ID - 44467
T2 - FilmZeit – Zeitdimensionen des Films.
TI - Zeitliche Komplexität im Film
ER -
TY - JOUR
AU - Wübbeke, Andrea
AU - Schöppner, Volker
AU - Arndt, Theresa
AU - Maras, Jan-Ole
AU - Fitze, Marcus
AU - Moltzahn, Christian
AU - Wu, Tao
AU - Niendorf, Thomas
ID - 24383
JF - Polymers
TI - Effect of nucleating additives on short- and long-term tensile strength and residual stresses of welded polypropylene samples
ER -
TY - THES
AU - Wübbeke, Andrea
ID - 37632
TI - Prozess-Struktur-Eigenschaftsbeziehung beim Heizelementschweißen von Polypropylen
ER -
TY - CHAP
AU - Wiens, Eugen
AU - Homberg, Werner
AU - Arian, Bahman
AU - Möhring, Kerstin
AU - Walther, Frank
ID - 30296
SN - 2367-1181
T2 - Forming the Future
TI - Forming of Parts with Locally Defined Mechanical and Ferromagnetic Properties by Flow-Forming
ER -
TY - JOUR
AU - Wischer, Christian
AU - Wiens, Eugen
AU - Homberg, Werner
ID - 26082
JF - Journal of Advanced Joining Processes
SN - 2666-3309
TI - Joining with versatile joining elements formed by friction spinning
VL - 3
ER -
TY - GEN
ED - Wiens, Eugen
ED - Wischer, Christian
ED - Homberg, Werner
ID - 22453
TI - Development of a novel adaptive joining technology employing Friction-Spun Joint Connectors (FSJC)
ER -
TY - JOUR
AB - Multiprofessionelle Teams sind notwendiger Bestandteil inklusiver Schulen. Die Verteilung von Aufgaben, welche über die Zusammenarbeit von allgemeinen und sonderpädagogischen Lehrkräften im Unterricht hinausgehen, wurde bislang jedoch selten systematisch untersucht. Im Beitrag werden deskriptive Befunde aus dem Projekt BiFoKi (Bielefelder Fortbildungskonzept zur Kooperation in inklusiven Schulen) zu den Zuständigkeiten von allgemeinen (N = 170) und sonderpädagogischen Lehrkräften (N = 24) sowie Schulsozialarbeiterinnen (N = 11) an inklusiven Sekundar- und Gesamtschulen präsentiert. Sie deuten auf eine Persistenz traditioneller Rollenmuster und Aufgabenverteilungen hin. Bei den befragten sonderpädagogischen Lehrkräften können zwei unterschiedliche Rollenmuster herausgearbeitet werden. Die Schulsozialarbeiterinnen weisen ein enges Arbeitsfeld mit einem Fokus auf Eltern-Schule-Kooperation auf.
AU - Neumann, Phillip
AU - Grüter, Sandra
AU - Eckel, Lisa
AU - Lütje-Klose, Birgit
AU - Wild, Elke
AU - Gorges, Julia
ID - 34484
IS - 4
JF - Zeitschrift für Heilpädagogik
KW - Inklusion
KW - Sonderpädagogik
KW - Sekundarstufe
KW - Gesamtschulen
KW - Kooperation
KW - Schulsozialarbeit
KW - BiFoKi
SN - 0513-9066
TI - Aufgaben und Zuständigkeiten von allgemeinen und sonderpädagogischen Lehrkräften sowie Fachkräften der Schulsozialarbeit in inklusiven Schulen der Sekundarstufe I. Erste Ergebnisse aus dem BiFoKi-Projekt
VL - 73
ER -
TY - CHAP
AU - Tecklenburg, Feline
ED - Fehle, Hans Jörg
ED - Langenbacher, Andrea
ID - 44526
T2 - Dass die Welt wohnlich für alle wird. Klartexte, Anfragen, Perspektiven. Ina Praetorius zum 65. Geburtstag
TI - Wirtschaft ist Care ist radikale Demokratie
ER -
TY - JOUR
AB - This paper is devoted to algebro-geometric study of infinite dimensional Lie bialgebras, which arise from solutions of the classical Yang–Baxter equation. We regard trigonometric solutions of this equation as twists of the standard Lie bialgebra cobracket on an appropriate affine Lie algebra and work out the corresponding theory of Manin triples, putting it into an algebro-geometric context. As a consequence of this approach, we prove that any trigonometric solution of the classical Yang–Baxter equation arises from an appropriate algebro-geometric datum. The developed theory is illustrated by some concrete examples.
AU - Burban, Igor
AU - Abedin, R.
ID - 44329
IS - 2
JF - Communications in Mathematical Physics
TI - Algebraic geometry of Lie bialgebras defined by solutions of the classical Yang-Baxter equation
VL - 387
ER -
TY - BOOK
AU - Adelmann, Ralf
ID - 44546
TI - Listen und Rankings. Über Taxonomien des Populären
ER -
TY - BOOK
AU - Buhl, Heike M.
AU - Bonanati, Sabrina
AU - Eickelmann, Birgit
ID - 32464
SN - 978-3-8017-3074-1
TI - Schule in der digitalen Welt
ER -
TY - CHAP
AU - Eickelmann, Birgit
ID - 44678
T2 - Remote Schools. Schulisches Distanzlernen in und nach der Corona-Pandemie.
TI - Digitale Schultransformation ganzheitlich gestalten
ER -
TY - GEN
AU - Eickelmann, Birgit
ID - 44680
TI - Lehren aus der Pandemie: Gleiche Chancen für alle Kinder und Jugendlichen sichern. Stellungnahme der Expert*innenkommission der Friedrich-Ebert-Stiftung
ER -
TY - CONF
AB - Challenges in decisions on technical changes are the lack of knowledge about the expected impact and change propagation. Currently, no literature study contains a systematic differentiation and evaluation of existing approaches, which is a prerequisite for practitioners to select a suitable approach. This research aims at defining differentiation criteria as well as generally applicable requirements for evaluation. A four-step approach is used: systematic literature review on approaches for impact analysis of engineering changes (1), categorization and prioritization of approaches based on reoccuring elements (2), derivation of context specific requirements for evaluation (3), and evaluation of approaches (4). The result indicates existing potential of object-oriented modeling approaches.
AU - Gräßler, Iris
AU - Wiechel, Dominik
ED - Krause, Dieter
ED - Paetzold, Kristin
ED - Wartzack, Sandro
ID - 24280
KW - Engineering Change Management
KW - Impact Analysis
KW - Engineering Changes
KW - Model-based Systems Engineering
KW - Product Developmen
T2 - DS 111: Proceedings of the 32nd Symposium Design for X
TI - Systematische Bewertung von Auswirkungsanalysen des Engineering Change Managements
ER -
TY - CONF
AU - Gräßler, Iris
AU - Roesmann, Daniel
AU - Wiechel, Dominik
AU - Preuß, Daniel
AU - Pottebaum, Jens
ID - 26866
T2 - 54th CIRP Conference on Manufacturing Systems
TI - Determine similarity of assembly operations using semantic technology
ER -
TY - CONF
AU - Gräßler, Iris
AU - Wiechel, Dominik
AU - Pottebaum, Jens
ID - 23392
T2 - Proceedings of 19th Drive Train Technology Conference (ATK 2021), 9. - 11. Mrz. 2021
TI - Role model of model-based systems engineering application
ER -
TY - CHAP
AU - Schreckenberg, Stefan
ED - Mecke, Jochen
ED - Schoentjes, Pierre
ED - Donnarieix, Anne-Sophie
ID - 44693
T2 - Esthétique de la guerre - Éthique de la paix. Un siècle de littérature sur la Grande Guerre
TI - Éthiques et esthétiques de la Grande Guerre chez des auteurs de la génération des petits-enfants
ER -
TY - CONF
AB - Challenges of the development of mechatronic systems and corresponding production systems have increased steadily. Changes are primarily due to increased product complexity and the connection to the internet of things and services, enabling Cyber-Physical Systems (CPS) and Cyber-Physical Production Systems (CPPS). Major innovations of the revised VDI guideline 2206 for developing mechatronic systems are systems thinking as a core element and six checkpoints for structuring deliverables along the V-Model. These checkpoints serve for orientation in result progress and thus enable a structured and complete development process. However, tasks and checkpoints of the new guideline focus on the product development itself without integrating the development of related CPPS, enabling optimization simultaneously to system development. Implications are derived by a three-step analysis. The paper at hand contributes fundamental extensions of the checkpoint questions regarding integrated CPPS development. These questions provide methodical support for system developers of CPPS for CPS by enabling the project manager to check the status, schedule further development steps and evaluate the maturity of the whole, integrated development.
AU - Gräßler, Iris
AU - Wiechel, Dominik
AU - Roesmann, Daniel
AU - Thiele, Henrik
ID - 24080
KW - Cyber-Physical Production System (CPPS)
KW - V-Model
KW - Product System Development
KW - Integrated Development
KW - VDI 2206
SN - 2212-8271
T2 - Procedia CIRP
TI - V-model based development of cyber-physical systems and cyber-physical production systems
ER -
TY - CONF
AB - In order to optimize production processes and to avoid errors, it is not only necessary to automate processes, but also to integrate workers with their individual personality and skill profiles. For this purpose, human factors should be considered in the entire design process. The integrated view of mental human models, the cognitive demand of the working environment and the automation design is essential. Human-System Integration (HSI) constitutes a promising approach. Current model-based approaches offer possibilities to analyze and optimize tasks within an overall system, but they still lack integration. This leads to the research question: How can human factors be integrated into a system model of a socio-technical, Cyber-Physical Production System? The paper at hand contributes an approach of human factor integration into the procedure of Model-Based Systems Engineering for Cyber-Physical Production Systems (CPPS). The approach combines a system model of a CPPS with HSI concepts. In accordance to the benefits of MBSE, SysML is selected to integrate human factors in the development process of a CPPS. The approach is divided into five steps, which includes the extension of the SysML meta model. This allows the optimization of skill-based human-machine interaction. Defined HSI-Profiles enable system developers to integrate employee requirements at early stages within the development process. The approach is demonstrated by the maintenance of a 3D-Printer as a case example. This research enables system developers to depict individual workers with the help of the developed concepts and systematically integrate them into the development process of a CPPS.
AU - Gräßler, Iris
AU - Wiechel, Dominik
AU - Roesmann, Daniel
ID - 24281
SN - 2212-8271
T2 - Procedia CIRP
TI - Integrating human factors in the model based development of cyber-physical production systems
ER -
TY - CONF
AU - Hesse, Philipp
AU - Gräßler, Iris
ED - Biedermann, Hubert
ED - Posch, Wolfgang
ED - Vorbach, Stefan
ID - 24444
T2 - Digitalisierung im Kontext von Nachhaltigkeit und Klimawandel
TI - Digitaler Zwilling zur Gestaltung der Prozesse im End-of-Life
VL - 9
ER -
TY - GEN
AU - Gräßler, Iris
AU - Hentze, Julian
AU - Hesse, Philipp
AU - Preuß, Daniel
AU - Thiele, Henrik
AU - Wiechel, Dominik
AU - Bothen, Martin
AU - Bruckmann, Tobias
AU - Dattner, Michael
AU - Ehl, Thomas
AU - Hawlas, Martin
AU - Krimpmann, Christoph
AU - Lachmayer, Roland
AU - Knöchelmann, Marvin
AU - Mock, Randolf
AU - Mozgova, Iryna
AU - Schneider, Maximilian
AU - Stollt, Guido
ID - 27680
TI - VDI/VDE 2206 - Entwicklung mechatronischer und cyber-physischer Systeme
ER -
TY - CONF
AB - The battle of developing hardware Trojans and corresponding countermeasures has taken adversaries towards ingenious ways of compromising hardware designs by circumventing even advanced testing and verification methods. Besides conventional methods of inserting Trojans into a design by a malicious entity, the design flow for field-programmable gate arrays (FPGAs) can also be surreptitiously compromised to assist the attacker to perform a successful malfunctioning or information leakage attack. The advanced stealthy malicious look-up-table (LUT) attack activates a Trojan only when generating the FPGA bitstream and can thus not be detected by register transfer and gate level testing and verification. However, also this attack was recently revealed by a bitstream-level proof-carrying hardware (PCH) approach. In this paper, we present a novel attack that leverages malicious routing of the inserted Trojan circuit to acquire a dormant state even in the generated and transmitted bitstream. The Trojan's payload is connected to primary inputs/outputs of the FPGA via a programmable interconnect point (PIP). The Trojan is detached from inputs/outputs during place-and-route and re-connected only when the FPGA is being programmed, thus activating the Trojan circuit without any need for a trigger logic. Since the Trojan is injected in a post-synthesis step and remains unconnected in the bitstream, the presented attack can currently neither be prevented by conventional testing and verification methods nor by recent bitstream-level verification techniques.
AU - Ahmed, Qazi Arbab
AU - Wiersema, Tobias
AU - Platzner, Marco
ID - 20681
T2 - 2021 Design, Automation & Test in Europe Conference & Exhibition (DATE)
TI - Malicious Routing: Circumventing Bitstream-level Verification for FPGAs
ER -
TY - GEN
AU - Dewerth, Mats-Ole
AU - Neukötter, Moritz
ID - 42989
TI - Entwicklung eines Versuchsaufbaus zur rheo-optischen Untersuchung des Dehnverhaltens von Polymerschmelzen und -lösungen am Hochdruck-Kapillarrheometer (Studienarbeit)
ER -
TY - GEN
AU - Hütte, Marvin
AU - Neukötter, Moritz
ID - 43004
TI - Weiterentwicklung des Versuchsaufbaus zur Untersuchung von Polymerschmelzen und -lösungen am Hochdruck-Kapillarrheometer
ER -
TY - JOUR
AU - Mattiolo, Davide
AU - Steffen, Eckhard
ID - 23456
IS - 1
JF - Journal of Graph Theory
KW - factorization
KW - perfect matchings
KW - regular graphs
KW - r-graphs
SN - 0364-9024
TI - Highly edge‐connected regular graphs without large factorizable subgraphs
VL - 99
ER -
TY - JOUR
AU - Klopp, Antje
AU - Steffen, Eckhard
ID - 21827
JF - Graphs and Combinatorics
SN - 0911-0119
TI - Fractional Matchings, Component-Factors and Edge-Chromatic Critical Graphs
ER -
TY - JOUR
AU - Steffen, Eckhard
AU - Vogel, Alexander
ID - 13445
JF - European J. Combinatorics
TI - Concepts of signed graph coloring
VL - 91
ER -
TY - CHAP
AU - Dopheide, F.
AU - Freitag, Christine
AU - Koch, L.
AU - Struchholz, C.
ED - Gerholz, Karl-Heinz
ID - 37537
T2 - Impulse zu Methoden in der deutschsprachigen Civic Engagement-Forschung
TI - Gesellschaftliche Wirkprozesse des Civic Engagement qualitativ erforschen
ER -
TY - JOUR
AU - Freitag, Christine
ID - 37539
IS - 4
JF - Katechetische Blätter
TI - Denk-Wege zu einer religionssensiblen Schulkultur: erziehungswissenschaftliche Perspektiven
ER -
TY - CHAP
AU - Freitag, Christine
ED - Gerholz, Karl-Heinz
ID - 37533
T2 - Impulse zu Methoden in der deutschsprachigen Civic Engagement-Forschung
TI - Gesellschaftlich Wirkprozesse des Civic Engagement qualitativ erforschen
ER -
TY - GEN
AB - Erklärvideos gewinnen auch im Kontext des Physikunterrichts verstärkt an Relevanz. Um zu evaluieren, welche Gestaltungsaspekte ein wirkungsvolles Erklärvideo ausmachen, ist es das Ziel der vorliegenden Masterarbeit herauszufinden, welchen Einfluss die kohärente Gestaltung eines Erklärvideos hat. Dazu wird die Forschungsfrage gestellt: „Welchen Einfluss hat die kohärente Gestaltung eines Erklärvideos auf den dadurch hervorgerufenen Lernzuwachs im Vergleich zu einem in der Hinsicht nicht optimierten Video?“ Um die Forschungsfrage zu beantworten, ist eine quantitative Studie im Prä- und Posttestdesign mit Schüler:innen der Jahrgangsstufe Q1 durchgeführt worden. Außerdem wurde in verschiedenen Kategorien nach einer Bewertung der Videos gefragt.
Die Auswertung zeigt, dass durch das optimierte Video mit einem kleinen Effekt bessere Ergebnisse erzielt wurden, diese aber nicht signifikant und auch nicht für alle Aufgaben besser sind. Die Schüler:innen bewerteten das nicht optimierte Video in allen Kategorien besser als das optimierte Video. Auch dieses Ergebnis ist nicht signifikant.
AU - Hörnlein, Madeleine
ID - 35839
TI - Untersuchung von Erklärvideos im Physikunterricht - Wirksamkeit von Kohärenz
ER -
TY - JOUR
AB - This study uniquely employs a fuzzy-set qualitative comparative analysis (fsQCA) technique to account for complex relationships in consumption. The fsQCA technique assumes that relationships are based on a set–subset relationship. This assumption is fundamental when decision-makers are affected by information asymmetry and are, thus, required to jointly evaluate the credibility and reliability of a range of external signals. This issue also affects consumers in markets for cultural goods, where the quality of products is not known with certainty in advance of the purchase decision. Our study uses fsQCA to establish the effect of different quality signals on consumption in the US market for video game software. Our results show that reviews from professional critics alongside brand extension and multi-platform release strategies act as signals of product quality and, therefore, lead to high sales performance.
AU - Kaimann, Daniel
AU - Cox, Joe
ID - 44896
IS - 23
JF - Sustainability
KW - Management
KW - Monitoring
KW - Policy and Law
KW - Renewable Energy
KW - Sustainability and the Environment
KW - Geography
KW - Planning and Development
SN - 2071-1050
TI - A Comparative Analysis of Consumption: Evidence from a Cultural Goods Market
VL - 13
ER -
TY - JOUR
AU - Kaimann, Daniel
AU - Tanneberg, Ilka
AU - Cox, Joe
ID - 21289
IS - 1
JF - Managerial and Decision Economics
SN - 0143-6570
TI - “I will survive”: Online streaming and the chart survival of music tracks
VL - 42
ER -
TY - JOUR
AB - AbstractChanges in winery ratings in leading wine guides, that is, improvements as well as deteriorations, are typically attributed to corresponding changes in the quality of the wines produced by the respective winery. What remains unexplored in this context is changes in editorship and/or changes in the composition of the wine tasting teams working for the respective guide. Using data from two particularly prestigious German wine guides (Gault Millau and Vinum), this paper shows that these latter changes have a rather small, yet statistically significant impact on changes in winery ratings. Thus, consumers are well-advised to consider these changes before making their purchasing decision. (JEL Classifications: L21, M30, Q13)
AU - Frick, Bernd
ID - 44899
IS - 4
JF - Journal of Wine Economics
KW - Horticulture
KW - General Business
KW - Management and Accounting
KW - Food Science
SN - 1931-4361
TI - The Legacy of Gurus: The Impact of Armin Diel and Joel Payne on Winery Ratings in Germany
VL - 15
ER -
TY - JOUR
AU - Roos, E.
AU - Brehm, Martin
ID - 45001
JF - Phys. Chem. Chem. Phys.
TI - A Force Field for Bio-Polymers in Ionic Liquids (BILFF) – Part 1: [EMIm][OAc] / Water Mixtures
VL - 23
ER -
TY - JOUR
AU - Brehm, Martin
AU - Thomas, M.
ID - 45004
JF - Molecules
TI - Optimized Atomic Partial Charges and Radii Defined by Radical Voronoi Tessellation of Bulk Phase Simulations
VL - 26 (7)
ER -
TY - JOUR
AU - Roy, S.
AU - Brehm, Martin
AU - Sharma, S.
AU - Wu, F.
AU - Maltsev, D.
AU - Halstenberg, P.
AU - Gallington, L.
AU - Mahurin, S.
AU - Dai, S.
AU - Ivanov, A.
AU - Margulis, C.
AU - Bryantsev, V.
ID - 45005
JF - J. Phys. Chem. B
TI - Unraveling Local Structure of Molten Salts via X-Ray Scattering, Raman Spectroscopy, and ab initio Molecular Dynamics
VL - 125 (22)
ER -
TY - JOUR
AU - Triolo, A.
AU - Pietro, M. E. Di
AU - Mele, A.
AU - Celso, F. Lo
AU - Brehm, Martin
AU - Lisio, V. Di
AU - Martinelli, A.
AU - Chater, P.
AU - Russina, O.
ID - 45006
JF - J. Chem. Phys.
TI - Liquid Structure and Dynamics in the Choline Acetate:Urea 1:2 Deep Eutectic Solvent
VL - 154
ER -
TY - JOUR
AU - Codescu, M.-A.
AU - Weiß, M.
AU - Brehm, Martin
AU - Kornilov, O.
AU - Sebastiani, D.
AU - Nibbering, E. T. J.
ID - 45003
JF - J. Phys. Chem. A
TI - Switching Between Proton Vacancy and Excess Proton Transfer Pathways in the Reaction Between 7-Hydroxyquinoline and Formate
VL - 125 (9)
ER -
TY - JOUR
AU - Mukherjee, M.
AU - Tripathi, D.
AU - Brehm, Martin
AU - Riplinger, C.
AU - Dutta, A. K.
ID - 45000
JF - J. Chem. Theory Comput.
TI - Efficient EOM-CC-Based Protocol for the Calculation of Electron Affinity of Solvated Nucleobases: Uracil as a Case Study
VL - 17 (1)
ER -
TY - JOUR
AU - Triolo, A.
AU - Celso, F. Lo
AU - Brehm, Martin
AU - Lisio, V. Di
AU - Russina, O.
ID - 45002
JF - J. Mol. Liq.
TI - Liquid Structure of a Choline Chloride-Water Natural Deep Eutectic Solvent: A Molecular Dynamics Characterization
VL - 331
ER -