@article{58702,
abstract = {{ Background In basketball, changing direction is one of the primary mechanisms of anterior cruciate ligament (ACL) injury, often occurring within complex game situations with high cognitive demands. It is unknown how visual attention affects sidestep cutting kinematics during the entire energy absorption phase of the cut in an ecologically valid environment. Purpose The purpose of this research was to study the effect of added cognitive load, in the form of increased visual attentional demands, on sidestep cutting kinematics during the energy absorption phase of the cut in an ecologically valid environment. Study Design Crossover Study Methods Fifteen male basketball players (aged 22.1 ± 2.3) performed ten sidestep cutting movements without (BASE) and with (VIS) a visual attention dual task. 3D kinematics of the hip, knee and ankle were recorded utilizing Xsens IMU motion capture. Temporal kinematics were analyzed using Statistical Parametric Mapping. Discrete time point kinematics were additionally analyzed at initial contact (IC) and at peak knee flexion utilizing paired t-tests. Effect sizes were calculated. Results Hip flexion was significantly reduced in the VIS condition compared to the BASE condition (p<0.01), including at IC (VIS 35.0° ± 7.2°, BASE 40.7° ± 4.9°, p=0.02, d=0.92) and peak (VIS 37.8° ± 9.7°, BASE 45.5° ± 6.9°, p=0.001, d=0.90). Knee flexion was significantly reduced in the VIS condition, in comparison to the BASE condition (p<0.01), at peak (VIS 59.9° ± 7.5°, BASE 64.1° ± 7.4°, p=0.001, d=0.55). Conclusion The addition of visual attention during sidestep cutting altered lower limb kinematics, which may increase ACL injury risk. It is suggested that ACL injury risk screening and prevention should include sidestep cutting with visual attentional demands, in order to mimic the cognitive demands of the sports environment. Level of Evidence 3 }},
author = {{Rikken, Koen T.H. and Panneman, Tom and Vercauteren, Fabian and Gokeler, Alli and Benjaminse, Anne}},
issn = {{2159-2896}},
journal = {{International Journal of Sports Physical Therapy}},
number = {{11}},
publisher = {{International Journal of Sports Physical Therapy}},
title = {{{Increased Visual Attentional Demands Alter Lower Extremity Sidestep Cutting Kinematics in Male Basketball Players}}},
doi = {{10.26603/001c.124804}},
volume = {{19}},
year = {{2024}},
}
@article{57499,
author = {{Maalouly, J. and Hemker, D. and Hedayat, C. and Olbrich, M. and Lange, Sven and Mathis, H.}},
journal = {{Advances in Radio Science}},
location = {{Miltenberg}},
pages = {{53–59}},
title = {{{Using Autoencoders to Classify EMC Problems in Electronic System Development}}},
doi = {{10.5194/ars-22-53-2024}},
volume = {{22}},
year = {{2024}},
}
@article{59131,
abstract = {{Füllstoffe erhöhen die Wärmeleitfähigkeit von im Fused Filament Fabrication (FFF) Verfahren hergestellten Strukturen. Neben der Füllstoffart ist dabei der Füllstoffvolumenanteil relevant. Der maximal verarbeitbare Füllstoffanteil ist hier gegenüber vergleichbaren Spritzgussmaterialien reduziert. An der Kunststofftechnik Paderborn (KTP) wurde untersucht, welchen Einfluss spezifische Füllstoffe auf die Materialeigenschaften haben. Die additive Fertigung (AM) gewinnt durch stetig steigende Anforderungen an die Bauteilkomplexität und Fertigungsflexibilität nicht nur im Prototypenbau an Bedeutung [1]. Eines der am weitesten verbreiteten additiven Fertigungsverfahren ist dabei das Fused Filament Fabrication (FFF) Verfahren [2]. Bei diesem Verfahren wird ein Kunststofffilament in eine temperierte Düse gefördert, dort aufgeschmolzen und in einer charakteristischen, näherungsweise elliptischen Stranggeometrie ausgetragen. Durch die Verfahrbewegung der Plastifiziereinheit und der Bauplattform können dreidimensionale Strukturen gefertigt werden [3]. Das FFF-Verfahren zeichnet sich unter anderem durch die Verarbeitung einer großen Bandbreite an thermoplastischen Kunststoffen aus [4]. Dies ermöglicht eine anwendungsspezifische Materialauswahl. In diesem Zusammenhang stellt auch die Modifizierung mit Füllstoffen eine Möglichkeit dar, die Materialeigenschaften gezielt einzustellen. Die Füllstoffe können dabei nach dem jeweiligen Aspektverhältnis in Kugeln, Plättchen oder Fasern unterteilt werden [5]. Die Steigerung der Wärmeleitfähigkeit von im FFF-Verfahren hergestellten Strukturen ist aktuell Stand der Forschung, gewinnt jedoch vor dem Hintergrund der aktuellen Herausforderungen, z. B. in der Elektrotechnik, an Bedeutung [6]. Die Kunststofftechnik Paderborn (KTP) befasst sich am Direct Manufacturing Research Center (DMRC) – Academic derzeit mit der Entwicklung und Verarbeitung wärmeleitfähiger Kunststoffe für das FFF-Verfahren. Der Fokus liegt dabei auf den material- und prozessseitigen Einflüssen auf die Materialeigenschaften. Für die Erzielung hoher Wärmeleitfähigkeiten sind dabei die Wahl der Füllstoffart und des Füllstoffvolumenanteils hervorzuheben. Kenntnisse über die Auswirkungen der Füllstoffzugabe und dem Zusammenspiel zwischen den mechanischen Eigenschaften und der Wärmeleitfähigkeit sind für die anwendungsgerechte Bauteilauslegung essenziell. Das Vorgehen Zur Analyse der Wärmeleitfähigkeit wurde eine am DMRC – Academic entwickelte Methode verwendet. Diese basiert auf der Fertigung von zylindrischen Probekörpern, welche im FFF-Verfahren entlang der Längsachse parallel zu den drei Koordinatenrichtungen X, Y und Z orientiert gefertigt werden. Im Anschluss werden die Probekörper spanend auf das für die Messung erforderliche Maß nachbearbeitet. Dadurch können fertigungsbedingte Einflüsse auf die Geometrie und Oberflächengüte reduziert und damit die Messgenauigkeit erhöht werden (Bild 2). Durch die Fertigung von drei unterschiedlichen Orientierungen kann weiterhin eine resultierende Anisotropie bewertet werden. Die auf einem Doppelschneckenextruder (Thermo Fisher Process11) hergestellten Filamente wurden nachfolgend mit einem Gewo HTP260 (Gewo Feinmechanik) verarbeitet. Die entsprechenden FFF-Prozessparameter sind in Tabelle 1 dargestellt. Dabei ist anzumerken, dass eine Bauraumtemperierung im Allgemeinen und der auf 120 °C beheizte Bauraum für die Verarbeitung der betrachteten Materialien im Speziellen zur prozesssicheren FFF-Fertigung unerlässlich sind. Die Analyse der Wärmeleitfähigkeit erfolgte schließlich mittels der Laser-Flash-Analyse (LFA) (Netzsch LFA 467 HyperFlash) entsprechend der DIN EN ISO 22007-4 [7]. Für die Bewertung der mechanischen Eigenschaften wurden Probekörper entsprechend der DIN EN ISO 527-2 Typ 1BA unter Verwendung einer Kolben-Spritzgussmaschine (Thermo Fisher Mini Jet Pro) gefertigt und mit einer Zugprüfmaschine (Zwick/Roell ProLine Z 010) geprüft, um den grundlegenden Füllstoffeinfluss bewerten zu können [8]. Für die Untersuchungen wurde ein Kunststoff-Compound basierend auf Polybutylenterephthalat (PBT) ohne (PBTx) und mit (PBTxa) Verarbeitungshilfe verwendet. Als Füllstoffe kamen zwei wärmeleitfähige plättchenförmige Füllstoffe (Bezeichnung: F1 und F2) zur Anwendung, welche einen mittleren Partikeldurchmesser (d50) für F1 von 5,0 µm und für F2 von 7,9 µm aufweisen. Ergebnisse der Zugversuche Die Auswertung der mechanischen Eigenschaften zeigt den Einfluss des Füllstoffvolumenanteils anhand des Elastizitätsmoduls und der Bruchdehnung auf (Bild 3). Die resultierende Festigkeit wird durch die geringe Verstärkungswirkung der Plättchen hingegen nur geringfügig beeinflusst und ist folglich nicht gesondert aufgeführt. Im Gegensatz dazu erhöht sich die Steifigkeit mit steigendem Füllstoffvolumenanteil, was auf den erhöhten E-Modul der Füllstoffe gegenüber der Kunststoffmatrix zurückzuführen ist. So kann durch die Füllstoffzugabe mit einem Volumenanteil in Höhe von 22 {%} der E-Modul für das Material PBTxa-F1 gegenüber der reinen Kunststoffmatrix um den Faktor 2,7 gesteigert werden. Hingegen nimmt die Bruchdehnung mit steigendem Füllstoffvolumenanteil ab. Diese mit dem Volumenanteil positiv korrelierende Versprödung stellt einen begrenzenden Faktor bei der Herstellung hochgefüllter Filamente dar. So neigen höher gefüllte Filamente eher zu einem Bruch bei der Herstellung und Verarbeitung. Dies resultiert in den vorliegenden maximalen Füllstoffvolumenanteilen, welche im Vergleich zu Spritzgussmaterialien deutlich reduziert sind. Eine weitere Erhöhung führt zu einer unzureichenden Prozessstabilität und damit zu einer unzureichenden Verarbeitungseignung für das FFF-Verfahren. Weiterhin zeigt sich, dass der Einfluss der verwendeten plättchenförmigen Füllstoffe für eine identische Kunststoffmatrix vergleichbar ist. Durch die Verwendung von Verarbeitungshilfen können die mechanischen Eigenschaften allerdings beeinflusst werden. Die Erhöhung des E-Moduls und der Bruchdehnung ist dabei auf die verbesserte Benetzung der Füllstoffpartikel und damit eine verbesserte Kunststoff-Füllstoff-Interaktion zurückzuführen. Bewertung der Wärmeleitfähigkeit Zur Darstellung der Ergebnisse der Wärmeleitfähigkeit wurden die Messergebnisse von je vier Probekörpern über die Prüftemperaturen zwischen 30 °C und 180 °C in 30 °C Inkrementen gemittelt (Bild 4). Die Ergebnisse zeigen eine positive Korrelation zwischen einem zunehmenden Füllstoffvolumenanteil und der Wärmeleitfähigkeit. Diese Steigerung ist wiederum abhängig von der jeweilig verwendeten Füllstoffart. Hierbei liefert das Material PBTx-F2-X eine vergleichbare Wärmeleitfähigkeit wie die Materialien PBTx-F1 und PBTxa-F1 in der jeweiligen Y-Orientierung. Die Unterschiede zwischen den beiden Materialien PBTx-F1 und PBTxa-F1 sind hingegen minimal und der Einfluss der Verarbeitungshilfe auf die Wärmeleitfähigkeit dementsprechend als vernachlässigbar anzusehen. Weiterhin ist eine anisotrope Wärmeleitfähigkeit für die mit Plättchen gefüllten Kunststoffe ersichtlich. Während die X-Orientierung (entlang der abgelegten Stränge) eine erhöhte Wärmeleitfähigkeit für alle Materialien liefert, ist diese für die Z-Orientierung (zwischen den Schichten) am geringsten. Gründe hierfür sind der Strangverbund sowie die Füllstofforientierung innerhalb der abgelegten Stränge. Dabei ist die aufgezeigte Anisotropie für den Füllstoff F2 im Vergleich zu F1 leicht reduziert und bestätigt den spezifischen Einfluss der Füllstoffart. Auf Basis der Ergebnisse können allgemein drei charakteristische Orientierungen zur Bewertung der Wärmeleitfähigkeit erfasst werden. Für die Bauteilauslegung ist der aufgezeigte Einfluss plättchenförmiger Füllstoffe auf die sich einstellende Anisotropie von im FFF-Verfahren gefertigten Strukturen zwingend zu beachten. Ausblick Die angeführten Untersuchungen zeigen, dass die Verwendung von plättchenförmigen Füllstoffen in Abhängigkeit von dem Füllstoffvolumenanteil zu einer Beeinflussung der Materialeigenschaften führt. Die dargelegten Ergebnisse stellen in diesem Kontext eine Grundlage zur Bewertung des Zusammenhangs zwischen den mechanischen Eigenschaften und der Wärmeleitfähigkeit dar. Insbesondere die Limitierung des Füllstoffvolumenanteils durch die erhöhte Versprödung ist hierbei anzuführen. Aktuelle Untersuchungen an der Kunststofftechnik Paderborn befassen sich mit der Betrachtung weiterer material- und prozessseitiger Einflussgrößen auf die Wärmeleitfähigkeit. Die generierten Daten sollen schließlich für die Entwicklung eines Modells zur Vorhersage der Wärmeleitfähigkeit von im FFF-Verfahren gefertigten Strukturen zusammengeführt werden.}},
author = {{Moritzer, Elmar and Elsner, Christian Lennart and Salm, Maximilian Karl Franz}},
journal = {{Plastverarbeiter}},
keywords = {{Compoundieren, Fused Filament Fabrication}},
title = {{{Wie der Füllstoffvolumenanteil die Materialeigenschaften beeinflusst}}},
volume = {{2024}},
year = {{2024}},
}
@article{59135,
abstract = {{Compounding is an important step in processing base polymers and is used to incorporate various additives into a polymer. For this purpose, different screw elements are used for dispersive and distributive mixing on a co-rotating twin-screw extruder. Optimising the screw configuration requires precise knowledge of the screw elements’ mixing properties, which have not been thoroughly investigated. This study analyses the mixing behaviour of individual screw elements regarding dispersive and distributive mixing using 3D CFD flow simulations with subsequent particle tracking. For distributive mixing, the particle distribution behind the screw elements in the XY plane is analysed and the mixing index MQ, which relates the standard deviation and the mean value of the triangular areas between the particles, is calculated. For dispersive mixing, the maximum shear stress on the particle path and the integral of the shear stress over the residence time of each individual particle are determined. The results show that screw element geometry and rotation speed have a significant influence on dispersive and distributive mixing. In addition, better dispersive mixing is achievable with highly viscous materials. These findings enable the optimisation of the mixing zone of a co-rotating twin-screw extruder for the efficient mixing of mineral fillers.}},
author = {{Oldemeier, Jan Philipp and Schöppner, Volker}},
journal = {{Polymers}},
keywords = {{Compoundieren, disperses Mischen, distributives Mischen, Schneckenelemente}},
number = {{21}},
title = {{{Analysis of the Dispersive and Distributive Mixing Effect of Screw Elements on the Co-Rotating Twin-Screw Extruder with Particle Tracking}}},
doi = {{10.3390/polym16212952}},
volume = {{16}},
year = {{2024}},
}
@article{59269,
abstract = {{Ferroelectric materials play a crucial role in a broad range of technologies due to their unique properties that are deeply connected to the pattern and behavior of their ferroelectric (FE) domains. Chief among them, barium titanate (BaTiO3; BTO) sees widespread applications such as in electronics but equally is a ferroelectric model system for fundamental research, e.g., to study the interplay of such FE domains, the domain walls (DWs), and their macroscopic properties, owed to BTO’s multiple and experimentally accessible phase transitions. Here, we employ Second Harmonic Generation Microscopy (SHGM) to in situ investigate the cubic-to-tetragonal (at ∼126°C) and the tetragonal-to-orthorhombic (at ∼5°C) phase transition in single-crystalline BTO via three-dimensional (3D) DW mapping. We demonstrate that SHGM imaging provides the direct visualization of FE domain switching as well as the domain dynamics in 3D, shedding light on the interplay of the domain structure and phase transition. These results allow us to extract the different transition temperatures locally, to unveil the hysteresis behavior, and to determine the type of phase transition at play (first/second order) from the recorded SHGM data. The capabilities of SHGM in uncovering these crucial phenomena can easily be applied to other ferroelectrics to provide new possibilities for in situ engineering of advanced ferroic devices.}},
author = {{Kirbus, Benjamin and Seddon, Samuel D. and Kiseleva, Iuliia and Beyreuther, Elke and Rüsing, Michael and Eng, Lukas M.}},
issn = {{0021-8979}},
journal = {{Journal of Applied Physics}},
number = {{15}},
publisher = {{AIP Publishing}},
title = {{{Probing ferroelectric phase transitions in barium titanate single crystals via in-situ second harmonic generation microscopy}}},
doi = {{10.1063/5.0237769}},
volume = {{136}},
year = {{2024}},
}
@article{59273,
abstract = {{Ferroelectric domain walls (DWs) are promising structures for assembling future nano-electronic circuit elements on a larger scale since reporting domain wall currents of up to 1 mA per single DW. One key requirement hereto is their reproducible manufacturing by gaining preparative control over domain size and domain wall conductivity (DWC). To date, most works on DWC have focused on exploring the fundamental electrical properties of individual DWs within single-shot experiments, with an emphasis on quantifying the origins of DWC. Very few reports exist when it comes to comparing the DWC properties between two separate DWs, and literally nothing exists where issues of reproducibility in DWC devices have been addressed. To fill this gap while facing the challenge of finding guidelines for achieving predictable DWC performance, we report on a procedure that allows us to reproducibly prepare single hexagonal domains of a predefined diameter into uniaxial ferroelectric lithium niobate single crystals of 200 and 300 μm thickness, respectively. We show that the domain diameter can be controlled with an uncertainty of a few percent. As-grown DWs are then subjected to a standard procedure of current-limited high-voltage DWC enhancement, and they repetitively reach a DWC increase of six orders of magnitude. While all resulting DWs show significantly enhanced DWC values, their individual current–voltage (I–V) characteristics exhibit different shapes, which can be explained by variations in their 3D real structure reflecting local heterogeneities by defects, DW pinning, and surface-near DW inclination.}},
author = {{Ratzenberger, Julius and Kiseleva, Iuliia and Koppitz, Boris and Beyreuther, Elke and Zahn, Manuel and Gössel, Joshua and Hegarty, Peter A. and Amber, Zeeshan H. and Rüsing, Michael and Eng, Lukas M.}},
issn = {{0021-8979}},
journal = {{Journal of Applied Physics}},
number = {{10}},
pages = {{104302}},
publisher = {{AIP Publishing}},
title = {{{Toward the reproducible fabrication of conductive ferroelectric domain walls into lithium niobate bulk single crystals}}},
doi = {{10.1063/5.0219300}},
volume = {{136}},
year = {{2024}},
}
@article{54966,
abstract = {{Piezoresponse force microscopy (PFM) is one of the most widespread methods for investigating and visualizing ferroelectric domain structures down to the nanometer length scale. PFM makes use of the direct coupling of the piezoelectric response to the crystal lattice, and hence, it is most often applied to spatially map the three-dimensional (3D) near-surface domain distribution of any polar or ferroic sample. Nonetheless, since most samples investigated by PFM are at least semiconducting or fully insulating, the electric ac field emerging from the conductive scanning force microscopy (SFM) tip penetrates the sample and, hence, may also couple to polar features that are deeply buried into the bulk of the sample under investigation. Thus, in the work presented here, we experimentally and theoretically explore the contrast and depth resolution capabilities of PFM, by analyzing the dependence of several key parameters. These key parameters include the depth of the buried feature, i.e., here a domain wall (DW), as well as PFM-relevant technical parameters such as the tip radius, the PFM drive voltage and frequency, and the signal-to-noise ratio. The theoretical predictions are experimentally verified using x-cut periodically poled lithium niobate single crystals that are specially prepared into wedge-shaped samples, in order to allow the buried feature, here the DW, to be “positioned” at any depth into the bulk. This inspection essentially contributes to the fundamental understanding in PFM contrast analysis and to the reconstruction of 3D domain structures down to a 1 μm-penetration depth into the sample.}},
author = {{Roeper, Matthias and Seddon, Samuel D. and Amber, Zeeshan H. and Rüsing, Michael and Eng, Lukas M.}},
issn = {{0021-8979}},
journal = {{Journal of Applied Physics}},
keywords = {{Ferroelectrics, lithium niobate, piezoresponse force microscopy}},
number = {{22}},
publisher = {{AIP Publishing}},
title = {{{Depth resolution in piezoresponse force microscopy}}},
doi = {{10.1063/5.0206784}},
volume = {{135}},
year = {{2024}},
}
@article{60413,
author = {{Bartlitz, David}},
journal = {{Zeitschrift für Wirtschaftsrecht (ZIP)}},
number = {{12}},
pages = {{616--617}},
title = {{{Keine negativen Zinsen bei Berechnung der Vorfälligkeitsentschädigung. Anmerkung zu OLG Nürnberg, Urt. v. 25. 7. 2023 - 14 U 2764/22}}},
year = {{2024}},
}
@misc{60418,
abstract = {{Das Themenheft präsentiert forschende und strategische Perspektiven auf eine postdigitale Hochschullehre. Die COVID-19-Pandemie führte zu einer grundlegenden Umgestaltung der Hochschullehre und wirkte als Katalysator für die Gestaltung digital unterstützender Innovationen in der Hochschullehre. Unter dem Schlagwort postdigiale Hochschullehre beschäftigten sich die vorliegenden Beiträge der dghd-Tagung 2022 mit diesem veränderten Lehren und Lernen. }},
booktitle = {{die hochschullehre}},
editor = {{Neiske, Iris and Trier, Ulrike and Osthushenrich, Judith and Weber, Tassja}},
title = {{{Transformationen. Forschende und strategische Perspektiven auf eine postdigitale Hochschullehre}}},
doi = {{10.3278/HSLT2402W}},
volume = {{10}},
year = {{2024}},
}
@article{60314,
abstract = {{A method for the construction of bijective volumetric maps between 3D shapes is presented. Arbitrary shapes of ball-topology are supported, overcoming restrictions of previous methods to convex or star-shaped targets. In essence, the mapping problem is decomposed into a set of simpler mapping problems, each of which can be solved with previous methods for discrete star-shaped mapping problems. Addressing the key challenges in this endeavor, algorithms are described to reliably construct structurally compatible partitions of two shapes with constraints regarding star-shapedness and to compute a parsimonious common refinement of two triangulations.}},
author = {{Hinderink, Steffen and Brückler, Hendrik and Campen, Marcel}},
issn = {{0730-0301}},
journal = {{ACM Transactions on Graphics}},
number = {{6}},
pages = {{1--11}},
publisher = {{Association for Computing Machinery (ACM)}},
title = {{{Bijective Volumetric Mapping via Star Decomposition}}},
doi = {{10.1145/3687950}},
volume = {{43}},
year = {{2024}},
}
@article{52346,
abstract = {{Promising cathode materials for fluoride-ion batteries (FIBs) are 3d transition metal containing oxides with Ruddlesden-Popper-type structure. So far, multi-elemental compositions were not investigated, but could alternate electrochemical performance similar to what has been found for cathode materials for lithium-ion batteries. Within this study, we investigate RP type La2Ni0.75Co0.25O4.08 as an intercalation-based active cathode material for all-solid-state FIBs. We determine the structural changes of La2Ni0.75Co0.25O4.08 during fluoride intercalation / de-intercalation by ex-situ X-ray diffraction, which showed that F- insertion leads to transformation of the parent phase to three different phases. Changes in Ni and Co oxidation states and coordination environment were examined by X-ray absorption spectroscopy and magnetic measurements in order to understand the complex reaction behaviour of the phases in detail, showing that the two transition metals behave differently in the charging and discharging process. Under optimized operating conditions, a cycle life of 120 cycles at a critical cut-off capacity of 40 mAh g-1 against Pb/PbF2 was obtained, which is one of the highest observed for intercalation electrode materials in FIBs so far. The average Coulombic efficiencies ranged from 85% to 90%. Thus, La2Ni0.75Co0.25O4.08 could be a promising candidate for cycling-stable high-energy cathode materials for all-solid-state FIBs}},
author = {{Vanita, Vanita and Waidha, Aamir Iqbal and Vasala, Sami and Puphal, Pascal and Schoch, Roland and Glatzel, Pieter and Bauer, Matthias and Clemens, Oliver}},
issn = {{2050-7488}},
journal = {{Journal of Materials Chemistry A}},
keywords = {{Xray}},
number = {{12}},
publisher = {{Royal Society of Chemistry (RSC)}},
title = {{{Insights into the First Multi-Transition-Metal Containing Ruddlesden Popper-Type Cathode for all-solid-state Fluoride Ion Batteries}}},
doi = {{10.1039/d4ta00704b}},
year = {{2024}},
}
@article{61834,
abstract = {{Abstract3D printing or additive manufacturing (AM) possesses enormous potential to benefit the manufacturing industry. Presently, rotary draw bending (RDB) is one of the most commonly used cold-forming industrial process for bending metal tubes. Pressure die is a fundamental forming tool in RDB processes, and it is conventionally made by various grades of comparatively expensive alloy steels. This research presents a novel design of a pressure die which can be 3D printed by using inexpensive polymeric filaments. In this research paper, the 3D-printed pressure die is named as “FFF-pressure die.” The material used to fabricate the FFF-pressure die is a thermoplastic polymer known as “ecoPLA.” The mechanical properties of ecoPLA are studied in relation to the process conditions of a RDB process. Firstly, an initial feasibility of using the FFF-pressure die in a RDB process is obtained by conducting a quick static stress analysis with actual process conditions. After initial feasibility, a complete RDB process is developed and simulated with actual process conditions and material properties. The FFF-pressure die is then practically fabricated by FFF 3D printer and experimentally tested on an industrial RDB machine. The results of practical experiments are compared with the simulation results. In order to make a comparison of the FFF-pressure die with the conventional metal pressure die, the simulation and practical process is also conducted with the conventional metal pressure die. A performance and cost comparison is made between the polymeric FFF-pressure die and the conventional metal pressure die. Von Mises stresses, contact forces, failure risk, and elastic deformations are analyzed. The advantages and limitations of using the FFF-pressure die in a RDB process are discussed in the end. This research intends to widen the avenue of using cost-effective and lightweight forming tools in metal forming industries.}},
author = {{Kaleem, Muhammad Ali and Steinheimer, Rainer and Frohn-Sörensen, Peter and Gabsa, Steffen and Engel, Bernd}},
issn = {{0268-3768}},
journal = {{The International Journal of Advanced Manufacturing Technology}},
number = {{3-4}},
pages = {{1789--1804}},
publisher = {{Springer Science and Business Media LLC}},
title = {{{Additive manufacturing of polymeric pressure die for rotary draw bending process}}},
doi = {{10.1007/s00170-024-14221-3}},
volume = {{134}},
year = {{2024}},
}
@article{62942,
abstract = {{AbstractNanostructured bilayer thin films with superhydrophobic and superhydrophilic surfaces were prepared using Ti6Al4V alloy substrates which allowed for the comparative analysis of polyvinyl acetate (PVAc) particle adsorption as a function of the interface structure. The PVAc particles were obtained from emulsion polymerization of vinyl acetate. A superhydrophilic TiO2 nanofiber-based 3D network was created on the Ti6Al4V alloy substrate by application of a hydrothermal method. Subsequent UV-grafting of ultra-thin polydimethylsiloxane (PDMS) layers resulted in a superhydrophobic surface. The modification steps were followed via Diffuse Reflectance Infrared Fourier Transform Spectroscopy, X-ray Photoelectron Spectroscopy, Field Emission-Scanning Electron Microscopy, contact angle and Electrochemical Impedance Spectroscopy. A mechanism for the adsorption of PVAc at the two electrolyte/substrate interfaces could be revealed.}},
author = {{Neßlinger, Vanessa and Atlanov, Jan and Grundmeier, Guido}},
issn = {{3004-9261}},
journal = {{Discover Applied Sciences}},
number = {{6}},
publisher = {{Springer Science and Business Media LLC}},
title = {{{Interactions of polyvinyl acetate dispersions with nanostructured superhydrophilic and superhydrophobic Ti6Al4V alloy surfaces}}},
doi = {{10.1007/s42452-024-05916-z}},
volume = {{6}},
year = {{2024}},
}
@article{47992,
abstract = {{Ferroelectric domain boundaries are quasi-two-dimensional functional interfaces with high prospects for nanoelectronic applications. Despite their reduced dimensionality, they can exhibit complex non-Ising polarization configurations and unexpected physical properties. Here, the impact of the three-dimensional (3D) curvature on the polarization profile of nominally uncharged 180° domain walls in LiNbO3 is studied using second-harmonic generation microscopy and 3D polarimetry analysis. Correlations between the domain-wall curvature and the variation of its internal polarization unfold in the form of modulations of the Néel-like character, which we attribute to the flexoelectric effect. While the Néel-like character originates mainly from the tilting of the domain wall, the internal polarization adjusts its orientation due to the synergetic upshot of dipolar and monopolar bound charges and their variation with the 3D curvature. Our results show that curved interfaces in solid crystals may offer a rich playground for tailoring nanoscale polar states.}},
author = {{Acevedo-Salas, Ulises and Croes, Boris and Zhang, Yide and Cregut, Olivier and Dorkenoo, Kokou Dodzi and Kirbus, Benjamin and Singh, Ekta and Beccard, Henrik and Rüsing, Michael and Eng, Lukas M. and Hertel, Riccardo and Eliseev, Eugene A. and Morozovska, Anna N. and Cherifi-Hertel, Salia}},
issn = {{1530-6984}},
journal = {{Nano Letters}},
keywords = {{Mechanical Engineering, Condensed Matter Physics, General Materials Science, General Chemistry, Bioengineering}},
number = {{3}},
pages = {{795--803}},
publisher = {{American Chemical Society (ACS)}},
title = {{{Impact of 3D Curvature on the Polarization Orientation in Non-Ising Domain Walls}}},
doi = {{10.1021/acs.nanolett.2c03579}},
volume = {{23}},
year = {{2023}},
}
@inproceedings{48377,
author = {{Weber, Katharina S. and Schlesinger, Sabrina and Lang, Alexander and Straßburger, Klaus and Maalmi, Haifa and Zaharia, Oana P. and Goletzke, Janina and Buyken, Anette and Trenkamp, Sandra and Wagner, Robert and Lieb, Wolfgang and Roden, Michael and Herder, Christian}},
booktitle = {{Diabetologie und Stoffwechsel}},
issn = {{1861-9010}},
publisher = {{Georg Thieme Verlag}},
title = {{{Plant-based dietary patterns and cardiometabolic risk factors in subgroups of individuals with diabetes}}},
doi = {{10.1055/s-0043-1767936}},
year = {{2023}},
}
@article{48374,
abstract = {{Abstract
Purpose
Protein-rich foods show heterogeneous associations with the risk of type 2 diabetes (T2D) and it remains unclear whether habitual protein intake is related to T2D risk. We carried out an umbrella review of systematic reviews (SR) of randomised trials and/or cohort studies on protein intake in relation to risks of T2D.
Methods
Following a pre-specified protocol (PROSPERO: CRD42018082395), we retrieved SRs on protein intake and T2D risk published between July 1st 2009 and May 22nd 2022, and assessed the methodological quality and outcome-specific certainty of the evidence using a modified version of AMSTAR 2 and NutriGrade, respectively. The overall certainty of evidence was rated according to predefined criteria.
Results
Eight SRs were identified of which six contained meta-analyses. The majority of SRs on total protein intake had moderate or high methodological quality and moderate outcome-specific certainty of evidence according to NutriGrade, however, the latter was low for the majority of SRs on animal and plant protein. Six of the eight SRs reported risk increases with both total and animal protein. According to one SR, total protein intake in studies was ~ 21 energy percentage (%E) in the highest intake category and 15%E in the lowest intake category. Relative Risks comparing high versus low intake in most recent SRs ranged from 1.09 (two SRs, 95% CIs 1.02–1.15 and 1.06–1.13) to 1.11 (1.05–1.16) for total protein (between 8 and 12 cohort studies included) and from 1.13 (1.08–1.19) to 1.19 (two SRs, 1.11–1.28 and 1.11–1.28) (8–9 cohort studies) for animal protein. However, SRs on RCTs examining major glycaemic traits (HbA1c, fasting glucose, fasting insulin) do not support a clear biological link with T2D risk. For plant protein, some recent SRs pointed towards risk decreases and non-linear associations, however, the majority did not support an association with T2D risk.
Conclusion
Higher total protein intake was possibly associated with higher T2D risk, while there is insufficient evidence for a risk increase with higher intakes of animal protein and a risk decrease with plant protein intake. Given that most SRs on plant protein did not indicate an association, there is possibly a lack of an effect.
}},
author = {{Schulze, Matthias B. and Haardt, Julia and Amini, Anna M. and Kalotai, Nicole and Lehmann, Andreas and Schmidt, Annemarie and Buyken, Anette and Egert, Sarah and Ellinger, Sabine and Kroke, Anja and Kühn, Tilman and Louis, Sandrine and Nimptsch, Katharina and Schwingshackl, Lukas and Siener, Roswitha and Zittermann, Armin and Watzl, Bernhard and Lorkowski, Stefan}},
issn = {{1436-6207}},
journal = {{European Journal of Nutrition}},
keywords = {{Nutrition and Dietetics, Medicine (miscellaneous)}},
publisher = {{Springer Science and Business Media LLC}},
title = {{{Protein intake and type 2 diabetes mellitus: an umbrella review of systematic reviews for the evidence-based guideline for protein intake of the German Nutrition Society}}},
doi = {{10.1007/s00394-023-03234-5}},
year = {{2023}},
}
@article{48373,
abstract = {{Abstract
Purpose
This umbrella review aimed to assess whether dietary protein intake with regard to quantitative (higher vs. lower dietary protein intake) and qualitative considerations (total, plant-based or animal-based protein intake) affects body weight (BW), fat mass (FM) and waist circumference (WC).
Methods
A systematic literature search was conducted in PubMed, Embase and Cochrane Database of Systematic Reviews for systematic reviews (SRs) with and without meta-analyses of prospective studies published between 04 October 2007 and 04 January 2022. Methodological quality and outcome-specific certainty of evidence of the retrieved SRs were assessed by using AMSTAR 2 and NutriGrade, respectively, in order to rate the overall certainty of evidence using predefined criteria.
Results
Thirty-three SRs were included in this umbrella review; 29 were based on randomised controlled trials, a few included cohort studies. In studies without energy restriction, a high-protein diet did not modulate BW, FM and WC in adults in general (all “possible” evidence); for older adults, overall certainty of evidence was “insufficient” for all parameters. Under hypoenergetic diets, a high-protein diet mostly decreased BW and FM, but evidence was “insufficient” due to low methodological quality. Evidence regarding an influence of the protein type on BW, FM and WC was “insufficient”.
Conclusion
“Possible” evidence exists that the amount of protein does not affect BW, FM and WC in adults under isoenergetic conditions. Its impact on the reduction in BW and FM under hypoenergetic conditions remains unclear; evidence for an influence of protein type on BW, FM and WC is “insufficient”.
}},
author = {{Ellinger, Sabine and Amini, Anna M. and Haardt, Julia and Lehmann, Andreas and Schmidt, Annemarie and Bischoff-Ferrari, Heike A. and Buyken, Anette and Kroke, Anja and Kühn, Tilman and Louis, Sandrine and Lorkowski, Stefan and Nimptsch, Katharina and Schulze, Matthias B. and Schwingshackl, Lukas and Siener, Roswitha and Stangl, Gabriele I. and Volkert, Dorothee and Zittermann, Armin and Watzl, Bernhard and Egert, Sarah}},
issn = {{1436-6207}},
journal = {{European Journal of Nutrition}},
keywords = {{Nutrition and Dietetics, Medicine (miscellaneous)}},
publisher = {{Springer Science and Business Media LLC}},
title = {{{Protein intake and body weight, fat mass and waist circumference: an umbrella review of systematic reviews for the evidence-based guideline on protein intake of the German Nutrition Society}}},
doi = {{10.1007/s00394-023-03220-x}},
year = {{2023}},
}
@article{48456,
abstract = {{Abstract
Purpose
Our aim was to assess alignment in timing of ‘highest caloric intake’ with individual chronotype and its association with body composition in adolescents.
Methods
We used repeatedly collected data from n = 196 adolescents (age 9–16 years, providing N = 401 yearly questionnaires) of the DONALD open cohort study. Chronotype was assessed by the Munich Chronotype Questionnaire from which midpoint of sleep (MSFsc) was derived. A sex- and age-specific diet-chrono-alignment score (DCAS) was calculated as the difference in hours between the chronotype-specific median timing of highest caloric intake of the studied population and the individual timing of ‘highest caloric intake’ or vice versa. Repeated-measures regression models were applied to study cross-sectional and longitudinal associations between the DCAS and body composition, e.g., Fat Mass Index (FMI) or Fat Free Mass Index (FFMI).
Results
DCAS ranged from −6:42 h to + 8:01 h and was not associated with body composition. Among adolescents with a later chronotype (N = 201) a 1 h increase in DCAS (later consumption of ‘highest caloric intake’ in comparison to the median intake of that group), increased FFMI by 1.92 kg/m2 (95% CI: 0.15, 3.69, p value = 0.04) over a median follow-up of 0.94 year.
Conclusion
Alignment of energy intake with individual chronotype appears beneficial for FFMI among those with a late chronotype.
}},
author = {{Jankovic, Nicole and Schmitting, Sarah and Stutz, Bianca and Krüger, Bettina and Buyken, Anette and Alexy, Ute}},
issn = {{1436-6207}},
journal = {{European Journal of Nutrition}},
keywords = {{Nutrition and Dietetics, Medicine (miscellaneous)}},
publisher = {{Springer Science and Business Media LLC}},
title = {{{Alignment between timing of ‘highest caloric intake’ and chronotype in relation to body composition during adolescence: the DONALD Study}}},
doi = {{10.1007/s00394-023-03259-w}},
year = {{2023}},
}
@article{48900,
author = {{Diederich, Sarah and Iseke, Anja and Pull, Kerstin and Schneider, Martin}},
issn = {{0958-5192}},
journal = {{The International Journal of Human Resource Management}},
keywords = {{Management of Technology and Innovation, Organizational Behavior and Human Resource Management, Strategy and Management, Business and International Management, Industrial relations}},
pages = {{1--29}},
publisher = {{Informa UK Limited}},
title = {{{Role (in-)congruity and the Catch 22 for female executives: how stereotyping contributes to the gender pay gap at top executive level}}},
doi = {{10.1080/09585192.2023.2273331}},
year = {{2023}},
}
@article{49446,
author = {{Diederich, Sarah and Iseke, Anja and Pull, Kerstin and Schneider, Martin}},
issn = {{0958-5192}},
journal = {{The International Journal of Human Resource Management}},
keywords = {{Management of Technology and Innovation, Organizational Behavior and Human Resource Management, Strategy and Management, Business and International Management, Industrial relations}},
pages = {{1--29}},
publisher = {{Informa UK Limited}},
title = {{{Role (in-)congruity and the Catch 22 for female executives: how stereotyping contributes to the gender pay gap at top executive level}}},
doi = {{10.1080/09585192.2023.2273331}},
year = {{2023}},
}