TY - CONF
AU - Ozuna, Edna
AU - Steinhoff, Lena
ID - 50977
TI - Face-to-Face Interactions in Peer-to-Peer Sharing Economy Services: An Effective Barrier to Customer Misbehavior?
ER -
TY - JOUR
AU - Junker, Annika
AU - Pape, Keno Egon Friedrich
AU - Timmermann, Julia
AU - Trächtler, Ansgar
ID - 50070
IS - 3
JF - IFAC-PapersOnLine
KW - General Medicine
SN - 2405-8963
TI - Adaptive Koopman-Based Models for Holistic Controller and Observer Design
VL - 56
ER -
TY - GEN
AU - Greil, Stefan
AU - Kaluza-Thiesen, Eleonore
AU - Schulz, Kim Alina
AU - Sureth-Sloane, Caren
ID - 48414
TI - Umfrage: Tax Compliance und Verrechnungspreise
ER -
TY - JOUR
AU - Maiterth, Ralf
AU - Sureth-Sloane, Caren
AU - Dyck, Daniel
AU - Heinemann-Heile, Vanessa
ID - 49548
IS - online first
JF - Schmalenbach IMPULSE
TI - GBP-Monitor Q3/2023: Das Wachstumschancengesetz – ein Investitionsimpuls?
VL - 3
ER -
TY - GEN
AU - Heinemann-Heile, Vanessa
AU - Maiterth, Ralf
AU - Sureth-Sloane, Caren
ID - 49295
TI - Umfrage: Bewertung Investitionsfördernder Maßnahmen durch Unternehmen aus Handel, Dienstleistung und Industrie
ER -
TY - GEN
AU - Heinemann-Heile, Vanessa
AU - Maiterth, Ralf
AU - Sureth-Sloane, Caren
ID - 49293
TI - Umfrage: Beurteilung Investitionsfördernder Maßnahmen durch Unternehmen im Handwerk
ER -
TY - JOUR
AB - Ernährungsbildung ist derzeit nur unzureichend in der Primarstufe verankert, sie sollte es jedoch sein, damit Kinder Kompetenzen für die Alltagsbewältigung im Handlungsfeld Ernährung und somit zur Teilhabe an der Gesellschaft anbahnen können. Essen und Ernährung bieten sich als perspektivenvernetzender Themenbereich für den Sachunterricht an.
AU - Bigga, Regine
ID - 51165
IS - 2
JF - HiBiFo – Haushalt in Bildung & Forschung
KW - Ernährungsbildung
KW - Sachunterricht
KW - Curriculumentwicklung
KW - Esskultur
SN - 2193-8806
TI - Essen und Ernährung im Sachunterricht
VL - 12
ER -
TY - JOUR
AB - This article presents the potential-dependent adsorption of two proteins, bovine serum albumin (BSA) and lysozyme (LYZ), on Ti6Al4V alloy at pH 7.4 and 37 °C. The adsorption process was studied on an electropolished alloy under cathodic and anodic overpotentials, compared to the open circuit potential (OCP). To analyze the adsorption process, various complementary interface analytical techniques were employed, including PM-IRRAS (polarization-modulation infrared reflection-absorption spectroscopy), AFM (atomic force microscopy), XPS (X-ray photoelectron spectroscopy), and E-QCM (electrochemical quartz crystal microbalance) measurements. The polarization experiments were conducted within a potential range where charging of the electric double layer dominates, and Faradaic currents can be disregarded. The findings highlight the significant influence of the interfacial charge distribution on the adsorption of BSA and LYZ onto the alloy surface. Furthermore, electrochemical analysis of the protein layers formed under applied overpotentials demonstrated improved corrosion protection properties. These studies provide valuable insights into protein adsorption on titanium alloys under physiological conditions, characterized by varying potentials of the passive alloy.
AU - Duderija, Belma
AU - González-Orive, Alejandro
AU - Ebbert, Christoph
AU - Neßlinger, Vanessa
AU - Keller, Adrian
AU - Grundmeier, Guido
ID - 46023
IS - 13
JF - Molecules
KW - Chemistry (miscellaneous)
KW - Analytical Chemistry
KW - Organic Chemistry
KW - Physical and Theoretical Chemistry
KW - Molecular Medicine
KW - Drug Discovery
KW - Pharmaceutical Science
SN - 1420-3049
TI - Electrode Potential-Dependent Studies of Protein Adsorption on Ti6Al4V Alloy
VL - 28
ER -
TY - JOUR
AU - Duderija, B.
AU - Sahin, F.
AU - Meinderink, D.
AU - Calderón-Gómez, J.C.
AU - Schmidt, H.C.
AU - Homberg, W.
AU - Grundmeier, G.
AU - González-Orive, A.
ID - 51167
JF - Journal of Advanced Joining Processes
KW - Mechanical Engineering
KW - Mechanics of Materials
KW - Engineering (miscellaneous)
KW - Chemical Engineering (miscellaneous)
SN - 2666-3309
TI - Electropolymerization of acrylic acid on steel for enhanced joining by plastic deformation
VL - 9
ER -
TY - CHAP
AU - Meyer-Hamme, Johannes
AU - Fastlabend-Vargas, Daniel
ED - Waldis, Monika
ED - Nitsche, Martin
ID - 43136
T2 - Geschichtsdidaktisch intervenieren
TI - „Fotos, die jede*r kennt?“ Eine empirische Untersuchung historischer Kenntnisforschung anhand von Bildikonen bei Studierenden des Lehramts Geschichte
ER -
TY - CHAP
AU - Friedberger, Vanessa
AU - Kaiser, Michaela
AU - Kottmann, Brigitte
AU - Schwermann, Anna
ED - Fischer, Christian
ED - Fischer-Ontrup , Christiane
ED - Käpnick, Friedhelm
ED - Neuber, Nils
ED - Reintjes, Christian
ID - 50734
T2 - Potenziale erkennen - Talente entwickeln - Bildung nachhaltig gestalten. Beiträge aus der Begabungsforschung
TI - Fallbezogene Reflexionen von Haltung und Professionalisierung pädagogischer Akteur*innen im Kontext begabungs- und leistungsfördernder Schulentwicklung
ER -
TY - CONF
AB - Abstract. Force-displacement measurements and macrosections are commonly used methods to validate numerical models of clinching processes. However, these ex-situ methods often lead to springback of elastic deformations and crack-closing after unloading. In contrast, the in-situ computed tomography (CT) can provide three-dimensional images of the clinching point under loading conditions. So far, the quantity of elastic springback that causes measuring deviations between in- and ex-situ measurements is not determined. In this paper, a method is described to quantitatively compare the results of in-situ CT, ex-situ CT and CT scans of cut specimens, which are prepared for macrosectioning, among each other. The method is applied to a single-lap shear test of two clinched aluminum sheets. Here, the test is conducted to specific process steps, then the specimen is CT scanned in-situ (during loading) and ex-situ (after unloading). Subsequently, the specimens are cut for macrosectioning and CT scanned. Finally, the outer contours and the interfaces of cross section images are determined by digital image analysis and the deviations over the clinching point between ex- and in-situ methods are calculated.
AU - Köhler, Daniel
AU - Kupfer, Robert
AU - Troschitz, Juliane
AU - Gude, Maik
ID - 51190
SN - 2474-395X
T2 - Materials Research Proceedings
TI - Comparison of ex- and in-situ investigations of clinched single-lap shear specimens
ER -
TY - CHAP
AU - Köhler, Daniel
AU - Stephan, Richard
AU - Kupfer, Robert
AU - Troschitz, Juliane
AU - Brosius, Alexander
AU - Gude, Maik
ID - 51194
SN - 2194-0525
T2 - Lecture Notes in Production Engineering
TI - In-situ Computed Tomography and Transient Dynamic Analysis of a Single-Lap Shear Test with a Composite-Metal Clinch Point
ER -
TY - JOUR
AB - Given a geometrically finite hyperbolic surface of infinite volume it is a
classical result of Patterson that the positive Laplace-Beltrami operator has
no $L^2$-eigenvalues $\geq 1/4$. In this article we prove a generalization of
this result for the joint $L^2$-eigenvalues of the algebra of commuting
differential operators on Riemannian locally symmetric spaces $\Gamma\backslash
G/K$ of higher rank. We derive dynamical assumptions on the $\Gamma$-action on
the geodesic and the Satake compactifications which imply the absence of the
corresponding principal eigenvalues. A large class of examples fulfilling these
assumptions are the non-compact quotients by Anosov subgroups.
AU - Weich, Tobias
AU - Wolf, Lasse Lennart
ID - 31189
JF - Communications in Mathematical Physics
TI - Absence of principal eigenvalues for higher rank locally symmetric spaces
VL - 403
ER -
TY - CHAP
AU - Meyer-Hamme, Johannes
ED - Fenn, Monika
ED - Zülsdorf-Kersting, Meik
ID - 41130
T2 - Geschichtsdidaktik
TI - Geschichtstheorie im Geschichtsunterricht
ER -
TY - CONF
AB - Polymer composites represent the industry standard in injection molding for the production of plastic components with increased requirements in terms of heat resistance and stiffness. In the field of laser sintering (LS), these materials are less common so far. In order to extend the available material variety for the LS process, new ceramic-filled Polyamide 613 powders are investigated within the scope of this work. Here, the resulting properties from two different powder production methods are compared. One filled powder is produced by dry blending and the other powder with the same filler and filling ratio is produced by encapsulating the filler particles inside the polymer particles within the dissolution-precipitation process. It was found that encapsulating the filler particles can provide certain benefits for the processability, for example an improved powder flowability or better filler dispersion. However, encapsulating the filler also alters the thermal properties of the precipitated powder.
AU - Kletetzka, Ivo
AU - Neitzel, Fabian
AU - Schmid, Hans-Joachim
ED - Beaman, Joseph
ID - 51218
KW - Additive Manufacturing
KW - Laser Sintering
KW - Filled Materials
KW - Composites
KW - Polyamide 613
T2 - Proceedings of the 34th Annual International Solid Freeform Fabrication Symposium
TI - Assessing the Impact of the Powder Production Method on Ceramic-filled Polyamide Composites made by Laser Sintering
ER -
TY - JOUR
AB - Dynamics-induced interchain charge transfer in a polymer aggregate in stack configuration can be understood by single-oligomer polaron energy.
AU - Bauch, Fabian
AU - Dong, Chuan-Ding
AU - Schumacher, Stefan
ID - 51093
IS - 38
JF - Journal of Materials Chemistry C
KW - Materials Chemistry
KW - General Chemistry
SN - 2050-7526
TI - Dynamics-induced charge transfer in semiconducting conjugated polymers
VL - 11
ER -
TY - JOUR
AB - Cooperative Driving requires ultra-reliable communications, and it is now clear that no single technology will ever be able to satisfy such stringent requirements, if only because active jamming can kill (almost) any wireless technology. Cooperative driving with multiple communication technologies which complement each other opens new spaces for research and development, but also poses several challenges. The work we present tackles the fallback and recovery mechanisms that the longitudinal controlling system of a platoon of vehicles can implement as a distributed system with multiple communication interfaces. We present a protocol and procedure to correctly compute the safe transition between different controlling algorithms, down to autonomous (or manual) driving when no communication is possible. To empower the study, we also develop a new version of PLEXE, which is an integral part of this contribution as the only Open Source, free simulation tool that enables the study of such systems with a modular approach, and that we deem offers the community the possibility of boosting research in this field. The results we present demonstrate the feasibility of safe fallback, but also highlight that such complex systems require careful design choices, as naïve approaches can lead to instabilities or even collisions, and that such design can only be done with appropriate in-silico experiments.
AU - Segata, Michele
AU - Lo Cigno, Renato
AU - Hardes, Tobias
AU - Heinovski, Julian
AU - Schettler, Max
AU - Bloessl, Bastian
AU - Sommer, Christoph
AU - Dressler, Falko
ID - 51266
IS - 8
JF - IEEE Transactions on Mobile Computing
SN - 1536-1233
TI - Multi-Technology Cooperative Driving: An Analysis Based on PLEXE
VL - 22
ER -
TY - CONF
AB - Platooning is a promising application in the field of vehicular networks. It has the potential to improve traffic flow, but also road safety. However, unreliable communication has strong negative effects on platoon stability and, thus, safety on roads. To improve reliability, in this work, we propose using multi-hop communication for platooning using the Decode and Forward (DF) Full-Duplex Relaying (FDR) scheme together with beamforming. We use computer simulations to demonstrate that FDR latency has no observable negative effect on string stability or safety even while performing an emergency brake. We further show that this combined approach reaches a constant Packet Delivery Ratio (PDR) of 100 % even in situations with high interference and/or congestion, where traditional approaches fail.
AU - Hardes, Tobias
AU - Klingler, Florian
AU - Sommer, Christoph
ID - 51264
T2 - IEEE Wireless Communications and Networking Conference 2023 (WCNC 2023)
TI - Improving Platooning Safety with Full Duplex Relaying and Beamforming
ER -
TY - JOUR
AB - We study the suitability of Unmanned Aerial Vehicles (UAVs) as purely opportunistic airborne virtual network infrastructure to support urban wireless networks, specifically in two Vehicle-to-Everything (V2X) use cases: First, UAVs being used as relays for cooperative awareness applications; second, UAVs being used to coordinate channel access for platooning in urban areas. We do not require that these UAVs alter trajectory nor speed from those of their random, unrelated primary missions, so that these additional tasks can be executed with close-to-zero impact on the execution of their primary missions. Based on extensive computer simulations we show that, within a wide band of acceptable speeds, flight routes (up to a standard deviation of 300 m from the optimum) as well as altitudes, opportunistic relaying of transmissions via UAVs can yield a benefit to system performance that is on the same order of magnitude as that of optimally deployed UAVs. We further show that an opportunistic channel access control can reduce the total number of packet collisions by approx. 86 % compared to a scenario without any UAVs. Moreover, much of the reduction in impact due to suboptimal missions can be recovered simply by moderately increasing the number of UAVs.
AU - Hardes, Tobias
AU - Sommer, Christoph
ID - 51267
JF - Elsevier Computer Communications
SN - 0140-3664
TI - Opportunistic Airborne Virtual Network Infrastructure for Urban Wireless Networks
ER -