TY - JOUR
AU - Bobzin, K.
AU - Kalscheuer, C.
AU - Grundmeier, Guido
AU - de los Arcos, T.
AU - Kollmann, S.
AU - Carlet, M.
ID - 36872
JF - Surface and Coatings Technology
KW - Materials Chemistry
KW - Surfaces
KW - Coatings and Films
KW - Surfaces and Interfaces
KW - Condensed Matter Physics
KW - General Chemistry
SN - 0257-8972
TI - Oxidation stability of chromium aluminum oxynitride hard coatings
VL - 449
ER -
TY - JOUR
AU - Neßlinger, Vanessa
AU - Welzel, Stefan
AU - Rieker, Florian
AU - Meinderink, Dennis
AU - Nieken, Ulrich
AU - Grundmeier, Guido
ID - 36873
JF - Macromolecular Reaction Engineering
KW - Polymers and Plastics
KW - General Chemical Engineering
KW - General Chemistry
SN - 1862-832X
TI - Thin Organic‐Inorganic Anti‐Fouling Hybrid‐Films for Microreactor Components
ER -
TY - JOUR
AB - In industrial x-ray computed tomography (CT), the application of more complex scan paths in comparison to the typical circular trajectory (${360}^{\circ}$ rotation of the measurement object) can extend the potential of CT. One way to enable such 3D scan trajectories is to use a 6-degrees-of-freedom (DOF) object manipulator system. In our case, a hexapod is mounted on top of the rotary table of a commercial CT scanner. This allows for adaptive tilting of the measurement object during the scan. For high accuracy, the geometry calibration of such setups is typically done using the x-ray projections of a calibrated multi-sphere object. Contrary to this, here, we demonstrate a procedure that is based on only a single sphere and can therefore experimentally be implemented with low effort. Using the intrinsic geometry parameters of the CT device as prior information, the hexapod coordinate system with respect to the CT machine coordinate system is determined by means of a one-step optimization approach. The resulting parameters are used to calculate projection matrices that enable the volume reconstruction for 3D scan trajectories. The method is validated using simulated x-ray images and experimental investigations including dimensional measurements. For the used setup, geometric measurement results for 3D scan trajectories that are calibrated with the presented method show in sum increased errors compared to the circular scans. A limited pose accuracy of the manipulator system is discussed as a potential cause. The results nevertheless indicate that the presented method is generally feasible for dimensional CT measurements provided that the pose accuracy is sufficient. The calibration procedure can therefore be a low-cost and easier to implement alternative compared to trajectory calibration methods based on multi-sphere objects, but with a tendency towards lower measurement accuracy. The methodology can in principle be transferred to different setups with 6-DOF manipulator systems, e.g. C-arm CT devices with a robot arm.
AU - Butzhammer, Lorenz
AU - Müller, Andreas Michael
AU - Hausotte, Tino
ID - 34264
IS - 1
JF - Measurement Science and Technology
KW - Applied Mathematics
KW - Instrumentation
KW - Engineering (miscellaneous)
SN - 0957-0233
TI - Calibration of 3D scan trajectories for an industrial computed tomography setup with 6-DOF object manipulator system using a single sphere
VL - 34
ER -
TY - JOUR
AU - Henksmeier, Tobias
AU - Schulz, Johann Friedemann
AU - Kluth, Elias
AU - Feneberg, Martin
AU - Goldhahn, Rüdiger
AU - Sanchez, Ana M.
AU - Voigt, Markus
AU - Grundmeier, Guido
AU - Reuter, Dirk
ID - 36804
JF - Journal of Crystal Growth
TI - Remote epitaxy of In(x)Ga(1-x)As(001) on graphene covered GaAs(001) substrates
VL - 593
ER -
TY - GEN
AB - The Julia programming language has evolved into a modern alternative to fill existing gaps in scientific computing and data science applications. Julia leverages a unified and coordinated single-language and ecosystem paradigm and has a proven track record of achieving high performance without sacrificing user productivity. These aspects make Julia a viable alternative to high-performance computing's (HPC's) existing and increasingly costly many-body workflow composition strategy in which traditional HPC languages (e.g., Fortran, C, C++) are used for simulations, and higher-level languages (e.g., Python, R, MATLAB) are used for data analysis and interactive computing. Julia's rapid growth in language capabilities, package ecosystem, and community make it a promising universal language for HPC. This paper presents the views of a multidisciplinary group of researchers from academia, government, and industry that advocate for an HPC software development paradigm that emphasizes developer productivity, workflow portability, and low barriers for entry. We believe that the Julia programming language, its ecosystem, and its community provide modern and powerful capabilities that enable this group's objectives. Crucially, we believe that Julia can provide a feasible and less costly approach to programming scientific applications and workflows that target HPC facilities. In this work, we examine the current practice and role of Julia as a common, end-to-end programming model to address major challenges in scientific reproducibility, data-driven AI/machine learning, co-design and workflows, scalability and performance portability in heterogeneous computing, network communication, data management, and community education. As a result, the diversification of current investments to fulfill the needs of the upcoming decade is crucial as more supercomputing centers prepare for the exascale era.
AU - Churavy, Valentin
AU - Godoy, William F
AU - Bauer, Carsten
AU - Ranocha, Hendrik
AU - Schlottke-Lakemper, Michael
AU - Räss, Ludovic
AU - Blaschke, Johannes
AU - Giordano, Mosè
AU - Schnetter, Erik
AU - Omlin, Samuel
AU - Vetter, Jeffrey S
AU - Edelman, Alan
ID - 36879
TI - Bridging HPC Communities through the Julia Programming Language
ER -
TY - JOUR
AU - Bonnard, Bernard
AU - Rouot, Jérémy
AU - Wembe Moafo, Boris Edgar
ID - 35206
JF - Mathematical Control and Related Fields
KW - Applied Mathematics
KW - Control and Optimization
KW - General Medicine
SN - 2156-8472
TI - Accessibility properties of abnormal geodesics in optimal control illustrated by two case studies
ER -
TY - JOUR
AU - Bonnard, B.
AU - Cots, O.
AU - Gergaud, J.
AU - Wembe Moafo, Boris Edgar
ID - 33869
JF - Systems & Control Letters
KW - Electrical and Electronic Engineering
KW - Mechanical Engineering
KW - General Computer Science
KW - Control and Systems Engineering
SN - 0167-6911
TI - Abnormal geodesics in 2D-Zermelo navigation problems in the case of revolution and the fan shape of the small time balls
VL - 161
ER -
TY - GEN
AU - Büchel, Daniel
AU - Visser, Anton
AU - Lehmann, Tim
AU - Baumeister, Jochen
ID - 36938
TI - Frontal theta power increases during table tennis play – indications for neurophysiological demands during open-skill sports?
ER -
TY - GEN
AU - Lehmann, Tim
AU - Visser, Anton
AU - Havers, Tim
AU - Büchel, Daniel
AU - Baumeister, Jochen
ID - 36937
IS - 9S
SN - 1530-0315
TI - Surface Instability Modulates Cortical Information Processing In Multi-Joint Compound Movements
VL - 54
ER -
TY - JOUR
AU - Constantiou, Ioanna
AU - Mukkamala, Alivelu
AU - Sjöklint, Mimmi
AU - Trier, Matthias
ID - 36961
JF - European Journal of Information Systems
KW - Library and Information Sciences
KW - Information Systems
SN - 0960-085X
TI - Engaging with self-tracking applications: how do users respond to their performance data?
ER -
TY - JOUR
AB - AbstractFurther innovation in the field of selective laser sintering (SLS) is strongly connected to the availability of new materials since the market is dominated by polyamide 12 (>90%). The aim of this publication is to develop a descriptive model for the droplet formation process in a Filament Extension Atomizer to predict the applicability to exploit further polymers for the SLS process. The feasibility was tested, investigated and characterized using a “Dripping out of a nozzle” setup for uniaxial extension. The droplet formation process was then observed via high-speed camera imaging and classified for certain parameters. The experiments were carried out using semi-diluted polyethylene oxide (600–4000 kg/mol), glycerol and water solutions as model fluids. Driven by the Plateau-Rayleigh instability, different types of spherical droplets were observed and various droplet formation mechanisms demonstrated and analyzed. Based on the experimental results, a predictive model is derived to describe various essential parameters.
AU - Neukötter, Moritz
AU - Jesinghausen, Steffen
AU - Schmid, Hans-Joachim
ID - 31035
JF - Rheologica Acta
KW - Rheology
KW - SLS
KW - Lasersintering
KW - exensional rheology
SN - 0035-4511
TI - Model droplet formation in extensional filament stretching within a Filament Extension Atomizer
ER -
TY - JOUR
AU - Thomas, Sven
ID - 36988
IS - 4
JF - Technology and Language
TI - Language in the Age of Mechanical Reproduction
VL - 3
ER -
TY - JOUR
AB - Iso-octane is frequently used as a surrogate fuel or as a component in primary reference fuel blends when low-temperature combustion strategies in engines are investigated. To develop control strategies for these engines, the reaction kinetics of iso-octane must be known starting from the low temperatures and intermediate pressures before ignition to the high temperatures and pressures of combustion. This work adds new experimental data sets to the validation data for reaction mechanism development by investigating the oxidation of iso-octane in stoichiometric mixtures in a flow reactor at pressures of p = 1, 10, and 20 bar and 473K ≤ T ≤ 973 K. The experimental data are compared to simulations with recent reaction mechanisms [Atef et al., Combustion and Flame 178, (2017), Bagheri et al., Combustion and Flame 212, (2020), Cai et al., Proceedings of the Combustion Institute 37, (2018), Fang et al., Combustion and Flame 214, (2020)]. The comparison between experimental and simulated mole fractions as function of temperature show reasonable agreement for all investigated pressures. In particular, the experimentally observed onset of low-temperature reactivity above a certain pressure, the shift of the negative temperature coefficient (NTC) regime with increasing pressure to higher temperatures, and the acceleration of the high-temperature chemistry are captured well in the simulations. Deviations between experimental and simulated results are discussed in detail for the reactivity of iso-octane and some key intermediates such as 2,2,4,4-tetramethyl-tetrahydrofuran, iso-butene and acetone at low temperatures.
AU - Shaqiri, S.
AU - Kaczmarek, D.
AU - vom Lehn, F.
AU - Beeckmann, J.
AU - Pitsch, H.
AU - Kasper, Tina
ID - 36815
JF - Frontiers in Energy Research
KW - Economics and Econometrics
KW - Energy Engineering and Power Technology
KW - Fuel Technology
KW - Renewable Energy
KW - Sustainability and the Environment
SN - 2296-598X
TI - Experimental Investigation of the Pressure Dependence of Iso-Octane Combustion
VL - 10
ER -
TY - JOUR
AU - Hoener, Martin
AU - Kasper, Tina
ID - 36817
JF - Combustion and Flame
KW - General Physics and Astronomy
KW - Energy Engineering and Power Technology
KW - Fuel Technology
KW - General Chemical Engineering
KW - General Chemistry
SN - 0010-2180
TI - Nitrous acid in high-pressure oxidation of CH4 doped with nitric oxide: Challenges in the isomer-selective detection and quantification of an elusive intermediate
VL - 243
ER -
TY - JOUR
AU - Knyazkov, Denis A.
AU - Cherepanov, Andrey V.
AU - Kiselev, Vitaly G.
AU - Gerasimov, Ilya E.
AU - Kasper, Tina
AU - Shmakov, Andrey G.
ID - 36810
JF - Proceedings of the Combustion Institute
KW - Physical and Theoretical Chemistry
KW - Mechanical Engineering
KW - General Chemical Engineering
SN - 1540-7489
TI - Experimental and kinetic modeling study of the positive ions in premixed ethylene flames over a range of equivalence ratios
ER -
TY - JOUR
AB - Owing to the implementation of multi-material construction methods in modern lightweight construction and the associated use of adhesive bonding technology, thermally induced relative displacements of the joining partners occur during the curing process. The resulting extremely complex thermo-chemo-mechanical stresses can influence the properties of the adhesive layers and reduce the load-bearing capacity. In this study, experiments are conducted to examine the influence of process-related thermal relative displacements on the mechanical properties of adhesives. The results show an anisotropy of the mechanical properties of the pre-deformed adhesive layers, depending on the magnitude and direction of the relative displacement.
AU - Beule, Felix
AU - Teutenberg, Dominik
AU - Meschut, Gerson
ID - 31330
JF - Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
KW - Mechanical Engineering
KW - Aerospace Engineering
SN - 0954-4070
TI - Directional dependence of the mechanical properties of structural adhesive joints with curing-induced pre-deformations
ER -
TY - JOUR
AU - Kaczmarek, D.
AU - Bierkandt, T.
AU - Rudolph, C.
AU - Grimm, S.
AU - Shaqiri, S.
AU - Höner, M.
AU - Gaiser, N.
AU - Atakan, B.
AU - Köhler, M.
AU - Hemberger, P.
AU - Kasper, Tina
ID - 36814
JF - Applications in Energy and Combustion Science
KW - Fuel Technology
KW - Energy (miscellaneous)
KW - Chemical Engineering (miscellaneous)
SN - 2666-352X
TI - Activation effect of ozone and DME on the partial oxidation of natural gas surrogates and validation of pressure-dependent ozone decomposition
ER -
TY - JOUR
AU - Kaczmarek, Dennis
AU - Rudolph, Charlotte
AU - Atakan, Burak
AU - Kasper, Tina
ID - 36811
JF - Proceedings of the Combustion Institute
KW - Physical and Theoretical Chemistry
KW - Mechanical Engineering
KW - General Chemical Engineering
SN - 1540-7489
TI - Kinetic investigation of the ozone-assisted partial oxidation of fuel-rich natural gas mixtures at elevated pressure
ER -
TY - JOUR
AU - Bierkandt, Thomas
AU - Hemberger, Patrick
AU - Oßwald, Patrick
AU - Gaiser, Nina
AU - Hoener, Martin
AU - Krüger, Dominik
AU - Kasper, Tina
AU - Köhler, Markus
ID - 36813
JF - Proceedings of the Combustion Institute
KW - Physical and Theoretical Chemistry
KW - Mechanical Engineering
KW - General Chemical Engineering
SN - 1540-7489
TI - A combustion chemistry study of tetramethylethylene in a laminar premixed low-pressure hydrogen flame
ER -
TY - JOUR
AB - Many mechanical material properties show a dependence on the strain rate, e.g. yield stress or elongation at fracture. The quantitative description of the material behavior under dynamic loading is of major importance for the evaluation of crash safety. This is carried out using numerical methods and requires characteristic values for the materials used. For the standardized determination of dynamic characteristic values in sheet metal materials, tensile tests performed according to the guideline from [1]. A particular challenge in dynamic tensile tests is the force measurement during the test. For this purpose, strain gauges are attached on each specimen, wired to the measuring equipment and calibrated. This is a common way to determine a force signal that is as low in vibration and as free of bending moments as possible. The preparation effort for the used strain gauges are enormous. For these reasons, an optical method to determine the force by strain measurement using DIC is presented. The experiments are carried out on a high speed tensile testing system. In combioantion with a 3D DIC high speed system for optical strain measurement. The elastic deformation of the specimen in the dynamometric section is measured using strain gauges and the optical method. The measured signals are then compared to validate the presented method. The investigations are conducted using the dual phase steel material HCT590X and the aluminum material EN AW-6014 T4. Strain rates of up to 240 s-1 are investigated.
AU - Böhnke, Max
AU - Unruh, Eduard
AU - Sell, Stanislaw
AU - Bobbert, Mathias
AU - Hein, David
AU - Meschut, Gerson
ID - 33002
JF - Key Engineering Materials
KW - Mechanical Engineering
KW - Mechanics of Materials
KW - General Materials Science
SN - 1662-9795
TI - Functionality Study of an Optical Measurement Concept for Local Force Signal Determination in High Strain Rate Tensile Tests
VL - 926
ER -