TY - JOUR A1 - Zellner, Gregor A1 - Paul, Dennis T1 - Ein strukturierter Vergleich ausgewählter Process Mining Tools JF - BIT Banking and Information Technology N2 - Die Notwendigkeit zur Optimierung und Automatisierung von Ablaufen in Unternehmen nimmt mit zunehmender Digitalisierung an Fahrt auf. Zur Unterstützung dieses Trends haben sich in den letzten Jahren einige Tools im Themenbereich Process Mining entwickelt und etabliert. Ziel dieser Untersuchung ist es, systematisch ausgewählte Tools anhand eines vorhandenen, aber weiterentwickelten Kriterienkatalogs zu vergleichen und damit dem Anwender eine strukturierte Einsicht in den aktuellen Markt der Process Mining Tools zu geben. Aus einer Auswahl von 44 Tools werden acht Tools genauer untersucht. Die letztendliche Auswahl hängt von vielen unternehmensindividuellen Faktoren ab, so dass kein pauschaler Vorschlag für das geeignetste Tool gegeben werden kann. KW - Process Mining KW - Vergleich KW - Tools Y1 - 2023 VL - Band 24, Oktober 2023 IS - 2 ER - TY - JOUR A1 - Pierobon, Chiara A1 - Sharshenova, Aijan T1 - German and Russian Public Diplomacy Efforts in Kyrgyzstan: A Comparative Study of Norm Entrepreneurship JF - Europe-Asia Studies N2 - This article explores Russian and German public diplomacy efforts in Central Asia through the example of Kyrgyzstan. Due to a difficult economic and socio-political situation, Kyrgyzstan remains open to externally funded programmes and projects, including initiatives funded by foreign governments, and thus offers a unique environment for the study of public diplomacy. The article looks at transnational public diplomacy actors such as German political foundations and Russian-sponsored organisations active in the country. Overall, the article offers interesting insights into the nature and substance of the soft power policies pursued by Germany and Russia that are relevant for Kyrgyzstan and beyond. Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-87380 VL - 75 IS - 8 SP - 1384 EP - 1407 PB - Taylor & Francis ER - TY - JOUR A1 - Schmiedt, Anja Bettina A1 - Cramer, Erhard T1 - Generalized Ng–Kundu–Chan model of adaptive progressive Type‐II censoring and related inference JF - Naval Research Logistics (NRL) N2 - The model of adaptive progressive Type‐II censoring introduced by Ng et al. (2009) (referred to as Ng–Kundu–Chan model) is extended to allow switching from a given initial censoring plan to any arbitrary given plan of the same length. In this generalized model, the joint distribution of the failure times and the corresponding likelihood function is derived. It is illustrated that the computation of maximum likelihood and Bayesian estimates are along the same lines as for standard progressive Type‐II censoring. However, the distributional properties of the estimators will usually be different since the censoring plan actually applied in the (generalized) Ng–Kundu–Chan model is random. As already mentioned in Cramer and Iliopoulos (2010), we directly show that the normalized spacings are independent and identically exponentially distributed. However, it turns out that the spacings themselves are generally dependent with mixtures of exponential distributions as marginals. These results are used to study linear estimators. Finally, we propose an algorithm for generating random numbers in the generalized Ng–Kundu–Chan model and present some simulation results. The results obtained also provide new findings in the original Ng–Kundu–Chan model; the corresponding implications are highlighted. Y1 - 2023 U6 - https://doi.org/10.1002/nav.22152 SN - 0894-069X VL - 71 IS - 3 SP - 389 EP - 415 PB - Wiley ER - TY - JOUR A1 - Hartmann, Julia A1 - Heckner, Markus A1 - Plach, Ulrike T1 - Future Skills bei Studierenden – Messung und Einflussfaktoren JF - Die Neue Hochschule N2 - Eine sich stetig verändernde Arbeitswelt erfordert neue Kompetenzen von unseren Studierenden. In der Lehre gilt es nicht nur, diese Zukunftskompetenzen (sog. Future Skills) zu fördern, sondern diese auch zu messem und sichtbar zu machen. KW - Future Skills KW - Studierende Y1 - 2023 UR - https://www.yumpu.com/de/document/read/68553002/die-neue-hochschule-heft-6-2023 IS - 6 SP - 24 EP - 27 ER - TY - JOUR A1 - Kunkler, Jan A1 - Kellner, Florian T1 - Sustainable City Evaluation Using the Database for Estimation of Road Network Performance JF - Sustainability N2 - This article introduces the Database for Estimation of Road Network Performance (DERNP) to enable wide-scale estimation of relevant Road Network Performance (RNP) factors for major German cities. The methodology behind DERNP is based on a randomized route sampling procedure that utilizes the Worldwide Harmonized Light Vehicles Test Procedure (WLTP) in combination with the tile-based HERE Maps Traffic API v7 and a digital elevation model provided by the European Union’s Earth Observation Programme Copernicus to generate a large set of independent and realistic routes throughout OpenStreetMap road networks. By evaluating these routes using the PHEMLight5 framework, a comprehensive list of RNP parameters is estimated and translated into polynomial regression models for general usage. The applicability of these estimations is demonstrated based on a case study of four major German cities. This case study considers network characteristics in terms of detours, infrastructure, traffic congestion, fuel consumption, and CO2 emissions. Our results show that DERNP and its underlying randomized route sampling methodology overcomes major limitations of previous wide-scale RNP approaches, enabling efficient, easy-to-use, and region-specific RNP comparisons. Y1 - 2023 U6 - https://doi.org/10.3390/su15010733 VL - 15 IS - 1 PB - MDPI ER - TY - JOUR A1 - Engl, Fabian A1 - Herrmann, Frank T1 - A Machine Learning based Approach on Employee Attrition Prediction with an Emphasize on predicting Leaving Reasons JF - Anwendungen und Konzepte der Wirtschaftsinformatik N2 - Using Vitesco Technologies as an example, this article examines whether machine learning models are suitable for detecting employee attrition at an early stage, with the aim of uncovering underlying reasons for leaving. Nine different machine learning algorithms were examined: K-nearest-neighbors, Naive Bayes, logistic regression, a support vector machine, a neural network, a random forest, adaptive boosting, and two gradient boosting models. A three-way-holdout validation method was implemented to assess the quality of the results and measure both the f-score and the degree of model generalization. Initially, it was found that tree-based methods are best suited for classifying employees. A multiclass classification approach showed that under certain conditions it is even possible to predict the underlying leaving reasons. KW - Machine Learning KW - Employee Attrition Prediction KW - Fluctuation Prediction KW - Employee Attrition KW - Leaving Reasons KW - AI Y1 - 2023 U6 - https://doi.org/10.26034/lu.akwi.2023.4488 SN - 2296-4592 IS - 18 SP - 30 EP - 40 PB - AKWI ER - TY - JOUR A1 - Kleinitz, Cornelia A1 - Apoh, Wazi A1 - Fiador, Ernest K. A1 - Kurapkat, Dietmar A1 - Linstädter, Jörg A1 - Loges, Kathrin A1 - Verstegen, Ute A1 - Zeitler, Annika T1 - Archäologie und „gemeinsames Erbe“ des deutschen Kolonialismus in Afrika BT - Das Volta-german Shared Colonial Heritage Project in Ghana JF - Blickpunkt Archäologie KW - Historische Bauforschung KW - Kolonialarchitektur KW - Ghana KW - Voltaregion KW - Afrikanische Archäologie KW - Baustoff KW - Kolonialismus KW - Christiliche Archäologie KW - Neuzeitliche Archäologie Y1 - 2023 SN - 2364-4796 VL - 2023 IS - 2/2023 PB - Dr. Friedrich Pfeil CY - München ER - TY - JOUR A1 - Kleinitz, Cornelia A1 - Apoh, Wazi A1 - Fiador, Ernest K. A1 - Kurapkat, Dietmar A1 - Linstädter, Jörg A1 - Loges, Kathrin A1 - Verstegen, Ute A1 - Zeitler, Annika T1 - Kpando, Volta Region, Ghana. Archaeology and ›Shared Heritage‹ of German Colonialism in Former Togoland. Research in 2022 and 2023 JF - e-Forschungsberichte des Deutschen Archäologischen Instituts N2 - A cooperative project focusing on the archaeology and ›shared heritage‹ of German colonialism in the former Togoland colony brings together capacities from Ghanaian and German partners in the fields of archaeology, history, ethnography, architecture/building archaeology and surveying/cartography. The project aims to document, research, preserve, and present built heritage from the German colonial period in close consultation and cooperation with local authorities and communities. Building on extensive archaeological research on German missionisation and colonisation of Togoland led by Wazi Apoh and students over the past 20 years, the project partners initially focus on archival and building archaeological research, including damage assessments and restoration/rehabilitation planning in addition to (GIS-)mapping. This report outlines preliminary results from preparatory research in 2022 and a first field season in the Volta Region of Ghana in early 2023, and it highlights possible avenues for further work. KW - Historische Bauforschung KW - Ghana KW - Voltaregion KW - Kolonialarchitektur KW - Afrikanische Archäologie KW - Baumaterialien KW - Kolonialismus KW - Christiliche Archäologie KW - Neuzeitliche Archäologie Y1 - 2023 U6 - https://doi.org/10.34780/06b8-361b SN - 2198-7734 IS - Faszikel 2-2023 SP - 20 EP - 32 CY - Berlin ER - TY - JOUR A1 - Stadler, Sebastian A1 - Cornet, Henriette A1 - Frenkler, Fritz T1 - Assessing Heuristic Evaluation in Immersive Virtual Reality: A Case Study on Future Guidance Systems JF - Multimodal Technologies and Interaction N2 - A variety of evaluation methods for user interfaces (UI) exist such as usability testing, cognitive walkthrough, and heuristic evaluation. However, UIs such as guidance systems at transit hubs must be evaluated in their intended application field to allow the effective and valid identification of usability flaws. However, what if evaluations are not feasible in real environments, or laboratorial conditions cannot be ensured? Based on adapted heuristics, in the present study, the method of heuristic evaluation is combined with immersive Virtual Reality (VR) for the identification of usability flaws of dynamic guidance systems (DGS) at transit hubs. The study involved usability evaluations of nine DGS concepts using the newly proposed method. The results show that compared to computer-based heuristic evaluations, the use of immersive VR led to the identification of an increased amount of “severe” usability flaws as well as overall usability flaws. Within a qualitative assessment, immersive VR is validated as a suitable tool for conducting heuristic evaluations involving significant advantages such as the creation of realistic experiences in laboratorial conditions. Future work seeks to further prove the suitability of using immersive VR for heuristic evaluations and compare the proposed method to other evaluative methods. KW - virtual reality KW - heuristic evaluation KW - human-computer interaction KW - user interfaces KW - guidance system Y1 - 2023 U6 - https://doi.org/10.3390/mti7020019 SN - 2414-4088 VL - 7 IS - 2 ER - TY - JOUR A1 - Schulz, Carsten A1 - Kieß, Benjamin A1 - Graneß, Henry T1 - Einfluss der Modellierungsstrategie des Zahnfußes auf den Drehwegfehler JF - Schwingungen 2023 : 4. VDI-Fachtagung : 27. und 28. November 2023, Würzburg N2 - Bei der Untersuchung und Optimierung der Getriebedynamik, im Sinne der Akustik und Lastverteilung, wird oftmals der Drehwegfehler als Bewertungskriterium herangezogen. Zahlreiche Forschungsvorhaben haben sich in diesem Zusammenhang intensiv mit dem Drehwegfehler als parametererregte Schwingungsanregung auseinandergesetzt, um diesen im Hinblick auf das Systemverhalten zu optimieren. Dabei bleibt der Zahnfußbereich, welcher außerhalb der Evolvente liegt, und dessen Einfluss auf den Drehwegfehler oftmals unberücksichtigt. Dieser Artikel untersucht daher den Einfluss des Zahnfußbereiches auf den statischen Drehwegfehler, indem relevante Größen wie das spezifische Kopfspiel und der Fußrundungsradius an einer typischen und real eingesetzten Stirnradverzahnung variiert werden. Ferner wird betrachtet, inwiefern der Drehwegfehler durch unterschiedliche Geometriedefinitionen (Fertigungssimulation, Zahngeometrie mit vereinfachter sowie stark vereinfachter Modellierung des Zahnfußbereichs) beeinflusst wird. Die Autoren nutzen hierfür zwei FE-Ansätze (adaptives und nicht-adaptives Netz) und bewerten diese hinsichtlich ihrer Gültigkeit, Modellgüte und Praktikabilität. Die Ergebnisse der Untersuchungen werden hinsichtlich einer minimal erforderlichen Geometrie des Zahnfußbereiches interpretiert. Für den Praxistransfer wird einerseits der maximale Fehler bei Nichtberücksichtigung des gesamten Zahnfußbereichs beziffert. Andererseits wird eine Empfehlung zur Anpassung einer vereinfachten Geometrie, an eine Geometrie, ähnlich der aus einer Fertigungssimulation, gegeben. Weiterhin wird der Artikel diskutieren, ob man ein vereinfachtes Zahnmodell zur Berechnung der Getriebedynamik nutzen kann, wenn der Fertigungsprozess noch nicht definiert ist. KW - Verzahnungsanregung KW - Getriebedynamik KW - Drehwegfehler Y1 - 2023 SN - 978-3-18-102429-4 U6 - https://doi.org/10.51202/9783181024294-57 SN - 0083-5560 SP - 57 EP - 70 PB - VDI Verlag CY - Düsseldorf ER - TY - JOUR A1 - Walter, Stefanie A1 - Schwanzer, Peter A1 - Hagen, Gunter A1 - Rabl, Hans-Peter A1 - Dietrich, Markus A1 - Moos, Ralf T1 - Combined Ash and Soot Monitoring for Gasoline Particulate Filters Using a Radio-Frequency-Based Sensor JF - Emission Control Science and Technology N2 - Increasingly stringent emission limits have made particulate filters necessary for gasoline engines. Similar to diesel applications, gasoline particulate filters (GPFs) can be monitored by differential pressure measurement or by the radio-frequency-based filter diagnosis (RF sensor). In addition to measuring the soot loading, ash detection is critical for monitoring the GPF over the entire vehicle lifetime. Because the RF sensor detects the filter loading through a change in the dielectric properties of the GPF, it can detect not only soot but also ash. In diesel applications, the RF sensor has already demonstrated its potential for ash detection. To verify the feasibility of simultaneous ash and soot monitoring for GPFs, filters were loaded with ash on an engine test bench and measured on a lab test bench under defined synthetic exhaust gas conditions. By evaluating resonant modes, soot and ash could be clearly distinguished, as ash mainly affects the resonant frequency, while soot also changes the quality factor due to its high dielectric losses. However, higher soot loadings could not be detected by the resonant parameters, but instead by a frequency-averaged transmission signal. While the presence of ash caused an offset in this signal, its sensitivity to soot was not affected. Thus, the influence of ash can be corrected if the signal in the soot-free filter state is known, e.g., from the behavior of the resonant parameters. Therefore, even with a continuously increasing ash loading over the lifetime of a vehicle, an accurate soot detection is possible with the RF sensor. KW - Gasoline particulate flter KW - Radio-frequency KW - Soot mass determination KW - Ash detection Y1 - 2023 U6 - https://doi.org/10.1007/s40825-023-00235-y PB - Springer ER - TY - JOUR A1 - Hertle, Dagmar A1 - Wende, Danny A1 - Schmitt, Nikolaus A1 - Bopp, Katharina A1 - Pfingsten, Andrea T1 - Verordnungsverhalten und Entscheidungsfindung in der Physiotherapie – Was läuft schief? : Rahmenbedingungen und empirische Analyse der Physiotherapieverordnungen bei Rückenschmerzen JF - Gesundheits- und Sozialpolitik N2 - Wer bekommt eine Verordnung zu welcher physiotherapeutischen Leistung und wie kommt die Entscheidung darüber zustande? Ist die Therapie leitliniengerecht? Dem Zusammenhang zwischen Heilmittel-Richtlinie, Heilmittelkatalog, ärztlicher Verordnung und durchgeführter Therapie wird in diesem Artikel am Beispiel chronischer Rückenschmerz auf der Basis von Routinedatenanalysen der BARMER nachgegangen. Y1 - 2023 U6 - https://doi.org/10.5771/1611-5821-2023-4-5-95 SN - 2942-3201 VL - 77 IS - 4-5 SP - 95 EP - 101 PB - Nomos ER - TY - JOUR A1 - Meussling-Sentpali, Annette T1 - Spiritual Care in der Pflege – Ressource auch für Pflegekräfte oder zusätzliche Belastung? JF - Spiritualität und Gesundheit: Zeitschrift der Stiftung für Gesundheit, Religiösität und Spiritualität Y1 - 2023 SN - 2813-2955 VL - 2 IS - 1 SP - 16 EP - 22 ER - TY - JOUR A1 - Meussling-Sentpali, Annette T1 - „Sterbehilfe“ – wovon reden wir? JF - ChrisCare N2 - Im folgenden Text möchte ich die verschiedenen Sterbehilfeformen etwas sortieren und einordnen. In der medialen Diskussion im Vorfeld der jüngst (ohne Ergebnis) erfolgten Bundestagsabstimmung zum § 217 StGB wurde die Schwierigkeit bei der Verwendung des Sterbehilfebegriffes besonders deutlich. Es war dabei oft nicht klar, ob es sich um die Beendigung von lebensverlängernden Maßnahmen, die Unterstützung beim Suizid oder die Tötung auf Verlangen handelt. Y1 - 2023 UR - https://verlagff.de/wp-content/uploads/2023/09/CC-3_202308-55-komprimiert.pdf VL - 3 SP - 18 EP - 19 PB - Frank Fornaçon ER - TY - JOUR A1 - Schaeffer, Leon A1 - Herrmann, David A1 - Schratzenstaller, Thomas A1 - Dendorfer, Sebastian A1 - Böhm, Valter T1 - Preliminary theoretical considerations on the stiffness characteristics of a tensegrity joint for the use in dynamic orthoses JF - Journal of Medical Robotics Research N2 - Early motion therapy plays an important role for effective long-term healing of joint injuries. In many cases, conventional dynamic orthoses fail to address the intricate movement possibilities of the underlying joints, limited by their simplistic joint representations, often represented by revolute joints, enabling rotations by only one axis. In this paper, a two-dimensional compliant tensegrity joint for use in biomedical applications is investigated. It consists of two compressed members and five compliant tensioned members. Relative movement possibilities are realized by the intrinsic compliance of the structure. In the development of these systems, the first step is the determination of the static stable equilibrium. This analysis is conducted in this paper by considering the potential energy approach or by using the geometric nonlinear finite element method. The mechanical behavior of the structure is assessed with a specific emphasis on its mechanical compliance. The primary objective of this study is the investigation of the influence of structural parameters on the overall stiffness and movability of the structure. The results underscore the significant effect of member parameters on the stiffness and movability of the compliant tensegrity joint, particularly under varying load magnitudes. These findings provide insights for optimizing the joint’s performance, contributing to its potential application in advanced orthotic and exoskeleton devices. KW - mechanical compliance KW - flexibility ellipsis KW - form-finding KW - tensegrity joint Y1 - 2023 U6 - https://doi.org/10.1142/S2424905X23400081 PB - World Scientific ER - TY - JOUR A1 - Voußem, Ludwig A1 - Groll, Thomas T1 - Employer Branding: Was bringt Sponsoring in der Bundesliga? JF - Personalwirtschaft N2 - Einige Unternehmen setzen Sportsponsoring gezielt ein, um auf ihre Attraktivität als Arbeitgeber hinzuweisen. Wissenschaftler der OTH Regensburg haben untersucht, wie Employer Branding mithilfe der Fußball-Bundesliga funktioniert. KW - Influencer KW - Mitarbeiterbindung KW - Motivation KW - Personalmanagement KW - Sponsoring KW - Sportmarketing Y1 - 2023 UR - https://www.personalwirtschaft.de/news/recruiting/employer-branding-was-bringt-sponsoring-in-der-bundesliga-155000/ SN - 0341-4698 IS - 4 SP - 64 EP - 66 PB - F.A.Z. BUSINESS MEDIA GmbH CY - Frankfurt am Main ER - TY - JOUR A1 - Nonn, Aida A1 - Kiss, Bálint A1 - Pezeshkian, Weria A1 - Tancogne-Dejean, Thomas A1 - Cerrone, Albert R. A1 - Kellermayer, Miklos A1 - Bai, Yuanli A1 - Li, Wei A1 - Wierzbicki, Tomasz T1 - Inferring mechanical properties of the SARS-CoV-2 virus particle with nano-indentation tests and numerical simulations JF - Journal of the mechanical behavior of biomedical materials N2 - The pandemic caused by the SARS-CoV-2 virus has claimed more than 6.5 million lives worldwide. This global challenge has led to accelerated development of highly effective vaccines tied to their ability to elicit a sustained immune response. While numerous studies have focused primarily on the spike (S) protein, less is known about the interior of the virus. Here we propose a methodology that combines several experimental and simulation techniques to elucidate the internal structure and mechanical properties of the SARS-CoV-2 virus. The mechanical response of the virus was analyzed by nanoindentation tests using a novel flat indenter and evaluated in comparison to a conventional sharp tip indentation. The elastic properties of the viral membrane were estimated by analytical solutions, molecular dynamics (MD) simulations on a membrane patch and by a 3D Finite Element (FE)-beam model of the virion's spike protein and membrane molecular structure. The FE-based inverse engineering approach provided a reasonable reproduction of the mechanical response of the virus from the sharp tip indentation and was successfully verified against the flat tip indentation results. The elastic modulus of the viral membrane was estimated in the range of 7-20 MPa. MD simulations showed that the presence of proteins significantly reduces the fracture strength of the membrane patch. However, FE simulations revealed an overall high fracture strength of the virus, with a mechanical behavior similar to the highly ductile behavior of engineering metallic materials. The failure mechanics of the membrane during sharp tip indentation includes progressive damage combined with localized collapse of the membrane due to severe bending. Furthermore, the results support the hypothesis of a close association of the long membrane proteins (M) with membrane-bound hexagonally packed ribonucleoproteins (RNPs). Beyond improved understanding of coronavirus structure, the present findings offer a knowledge base for the development of novel prevention and treatment methods that are independent of the immune system. Y1 - 2023 U6 - https://doi.org/10.1016/j.jmbbm.2023.106153 SN - 1751-6161 VL - 148 PB - Elsevier ER - TY - JOUR A1 - Thumann, Philipp A1 - Buchner, Stefan A1 - Marburg, Steffen A1 - Wagner, Marcus T1 - A comparative study of Glinka and Neuber approaches for fatigue strength assessment on 42CrMoS4-QT specimens JF - Strain N2 - In fatigue strength assessment, the methods based on ideal elastic stresses according to Basquin and the less established method based on elastic-plastic stress quantities according to Manson, Coffin and Morrow are applied. The former calculates loads using linear-elastic stresses, the latter requires elasticplastic evaluation parameters, such as stresses and strains. These can be determined by finite element analysis (FEA) with a linear-elastic constitutive law, and subsequent conversion to elastic-plastic loads, using the macro support formula by Neuber. In this contribution, an alternative approach to approximate elastic-plastic parameters proposed by Glinka is compared to the the strain-life method using Neuber's formula, as well as the stress-life method of Basquin. Several component tests on 42CrMoS4-QT specimens are investigated. To determine the input data for the fatigue strength evaluations, the entire test setup is computed by FEA. The nodal displacements from these validated full-model simulations are used as boundary conditions for a submodel simulation of a notch, whose results serve as input for the fatigue strength assessments. It is shown that all approaches provide a reliable assessment of components. Our key result is that the strain-life method using the concept by Glinka for notch stress computation, yields improved results in fatigue strength assessments. KW - 42CrMoS4-QT KW - fatigue strength KW - stress-life method KW - Glinka KW - strain-life method Y1 - 2023 U6 - https://doi.org/10.1111/str.12470 SN - 1475-1305 N1 - Corresponding author: Marcus Wagner VL - 2023 IS - e12470 PB - Wiley ER - TY - JOUR A1 - Kloiber, Jessica A1 - Schultheiß, Ulrich A1 - Sotelo, Lamborghini A1 - Sarau, George A1 - Christiansen, Silke H. A1 - Gavras, Sarkis A1 - Hort, Norbert A1 - Hornberger, Helga T1 - Corrosion behaviour of electropolished magnesium materials JF - Materials Today Communications N2 - Although magnesium and its alloys are promising candidates as biodegradable implant materials, the tendency for localized corrosion mechanism in physiological environment limit their biomedical application. Electropolishing is an attractive strategy for improving the corrosion behaviour of metals, but it is still largely unexplored in magnesium materials. In this study, the characterization of electropolished surfaces of AM50 and pure magnesium was performed, focussing on their in vitro degradation behaviour in cell medium. Corrosion rates were evaluated using potentiodynamic polarisation. The surface morphology before and after the onset of corrosion was investigated by scanning electron microscopy and confocal laser scanning microscopy. The presented electropolishing process led to improved surface performances, observable by significantly lower corrosion rates (0.08 mm·year-1 in Dulbecco's modified Eagle's medium), lower arithmetical mean height (0.05 µm), lower water contact angle (25-35°) and lower micro hardness (35-50 HV 0.1) compared to mechanically and chemically treated surfaces. MgO/Mg(OH)2 could be detected on electropolished surfaces. The localized corrosion mode could be reduced, but not entirely prevented. Electropolishing shows great potential as post-treatment of magnesium-based components, but detailed tests of the long-term corrosion behaviour are an important area of future research. KW - biomedical application KW - corrosion behaviour KW - electropolishing KW - magnesium alloy KW - pure magnesium KW - surface characterization Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-68254 N1 - Corresponding author: Helga Hornberger PB - Elsevier ET - Journal Pre-proof ER - TY - JOUR A1 - Krug, Henriette A1 - Scharf, Anna A1 - Weber, Karsten A1 - Kühn, Andrea A. A1 - Krause, Patricia A1 - Haug, Sonja T1 - Herzschrittmacher, Organ oder Gehstock? Vorher-Nachher-Befragung zur subjektiven Wahrnehmung eines Gerätes zur Tiefen Hirnstimulation JF - Fortschritte der Neurologie-Psychiatrie N2 - AIM OF THE STUDY This study was conducted in a pre-post design with a survey of patients who had undergone deep brain stimulation (DBS) as treatment for a neurological movement disorder. The aim of the study was to compare patients' expectations and beliefs before a DBS intervention with patients' subjective experience of this intervention. METHODOLOGY The longitudinal study of patients (n=132) with an indication for DBS therapy was based on a written survey at the time points of preoperative screening (pre-op) and one-year follow-up (post-op). RESULTS Preoperatively, a clear majority of respondents believed DSB to be similar to a pacemaker intervention, but one year after the intervention less than one third did so, as they compared DBS to using a walking stick or glasses. CONCLUSION The experience of DBS in the patient's own body seems to be comparable by means of individually different associations, whereby the comparison with non-invasive aids predominates postoperatively. The discussion of these descriptions in the educational interview can contribute to a realistic horizon of patients' expectations before DBS. ZIEL DER STUDIE Es wird eine Studie im Prä-Post-Design mit einer Befragung von Patient*innen vorgestellt, bei denen zur Therapie einer neurologischen Bewegungsstörung die Indikation für eine Tiefe Hirnstimulation (THS) gegeben war. Die Patient*innen wurden vor und nach der THS-Operation zu ihren präoperativen Assoziationen bzw. postoperativen Wahrnehmungen im Umgang mit einem Hirnschrittmacher befragt. Ziel der Untersuchung ist, die bisherige Praxis der ärztlichen Aufklärung vor einer THS-Intervention um Angaben zur subjektiven Erlebnisqualität dieser Intervention ergänzen zu können. METHODIK Es wurde eine Längsschnittstudie mit Patient*innen (n=132) durchgeführt, in der die Teilnehmenden zweizeitig schriftlich zu Imaginationen zu ihrer subjektiven Erlebnisqualität von THS befragt wurden. Die Untersuchungen erfolgten beim präoperativen Screening (Prä-OP) sowie beim Ein-Jahres-Follow-Up (Post-OP). ERGEBNISSE Präoperativ gab die Mehrheit der Befragten die Assoziation Herzschrittmacher an. Postoperativ wählten nur weniger als ein Drittel diese Option, gleich häufig wie die Assoziationen Gehstock oder Brille. SCHLUSSFOLGERUNG Die Erlebnisqualität von THS im eigenen Körper scheint sich mittels individuell verschiedener Assoziationen vergleichen zu lassen, wobei postoperativ der Vergleich mit nicht invasiven Hilfsmitteln überwiegt. Im Aufklärungsgespräch kann die Thematisierung dieser Beschreibungen bei den Patient*innen zu einem realitätsnahen Erwartungshorizont vor THS beitragen. T2 - Pacemaker, organ or walking stick? Pre-op association with and post-op subjective perception of a deep brain stimulation device KW - Aufklärungsgespräch KW - DBS device KW - deep brain stimulation KW - Erlebnisqualität KW - Hirnschrittmacher KW - pre-treatment consultation KW - quality of experience KW - Tiefe Hirnstimulation Y1 - 2023 U6 - https://doi.org/10.1055/a-2202-9772 PB - Thieme ER - TY - JOUR A1 - Galka, Stefan A1 - Wappler, Mona T1 - Integration of cash flow management and further aspects of the supply chain management in production system design JF - IFAC-PapersOnLine N2 - One major goal of production system design is to decide on space requirements in the plant. In this phase, detailed information about the supply chain network (e.g. which suppliers deliver which parts) is often unavailable. Nevertheless, typical decisions in supply chain management, like the definition of replenishment processes and quantities or make-or-buy decisions, impact space requirements and the capital investment in raw materials. Therefore, it should be considered in factory and production planning. This research article proposes a simulation approach for a production simulation in which raw material replenishment is integrated to evaluate the capital investment and space requirements for raw materials. Y1 - 2023 U6 - https://doi.org/10.1016/j.ifacol.2023.10.1687 VL - 56 IS - 2 SP - 947 EP - 952 PB - IFAC / Elsevier ER - TY - JOUR A1 - Haynack, Alexander A1 - Timothy, Jithender J. A1 - Kränkel, Thomas A1 - Gehlen, Christoph A1 - Thiel, Charlotte T1 - Analyse des Frost‐Tausalz‐Widerstands zementgebundener Baustoffe mittels 3D‐Laserscanning JF - ce/papers: Proceedings in Civil Engineering N2 - Eine Herausforderung performancebasierter Prüfverfahren zur Bewertung der Dauerhaftigkeit ist die Beschleunigung natürlicher Mechanismen. Dies ist notwendig, um innerhalb kurzer Zeit die Langzeit-Leistungsfähigkeit ermitteln zu können. Die Bestimmung der Frost-Tausalzbeständigkeit von Beton kann durch den CDF-Test erfolgen, welcher für Betone mit ausreichendem Frost-Tausalz-Widerstand sehr gut funktioniert. Bei Proben mit einer unzureichenden bzw. unbekannten Performance können erhöhte Randabwitterungen auftreten, welche durch das Ablösen des seitlichen Abdichtbands entstehen. Der zunehmende Randeinfluss führt so zu einer Verfälschung der Ergebnisse und zu einer Unterschätzung der tatsächlichen Performance des Bauteils. In diesem Beitrag werden Mörtel- und Betonprobekörper mit unterschiedlichen Abwitterungsraten in Anlehnung an das CDF-Verfahren untersucht. Zusätzlich wird die Oberflächenschädigung der Proben anhand einer neuartigen Messmethode mittels hochauflösendem 3D-Laserscanning ausgewertet. Die Ergebnisse zeigen, dass die Randeffekte mit der Laserscan-Methode umgangen und vergleichbare Ergebnisse zu den CDF-Untersuchungen erzielt werden können. Somit können Betone ohne Randeinflüsse charakterisiert und eine präzise Prognose der Langzeitbeständigkeit getroffen werden. KW - Beton KW - Mörtel KW - Frost-Tausalz-Widerstand KW - Dauerhaftigkeit KW - 3D-Laserscanning Y1 - 2023 U6 - https://doi.org/10.1002/cepa.2951 SN - 2509-7075 VL - 6 IS - 6 SP - 1189 EP - 1196 PB - Ernst & Sohn ER - TY - JOUR A1 - Grimm, Benedikt A1 - Thiel, Charlotte A1 - Kränkel, Thomas A1 - Gehlen, Christoph T1 - Einfluss der Permeation auf die Carbonatisierung von Beton JF - ce/papers: Proceedings in Civil Engineering N2 - Die Carbonatisierung von Beton kann einerseits zu Schäden bei Stahlbetonbauwerken führen, andererseits kann der Beton so CO2 speichern und damit seinen CO2-Fußabdruck verringern. In diesem Beitrag wird dargestellt, wie eine effiziente Beschleunigung der Carbonatisierung durch Anlegen eines geringen äußeren Drucks erreicht werden kann. Damit wird neben der Diffusion der wesentlich schneller ablaufende Transportmechanismus der Permeation ausgenutzt, der das CO2 tiefer in das Probeninnere transportiert und damit in kurzer Zeit die Bestimmung des Carbonatisierungswiderstand zementgebundener Materialien ermöglicht. Hierzu wurde eine Prüfeinrichtung entwickelt, die es ermöglicht, die CO2-Konzentration und in gewissen Grenzen auch relative Luftfeuchte sowie die Temperatur gezielt einzustellen und zu steuern, um so Mörtel- und Betonproben schnell und präzise zu carbonatisieren. Der Einfluss verschiedener Druckstufen und Wechselzyklen wird dargelegt und die resultierenden chemischen und physikalischen Veränderungen der Proben bestimmt. Als besonders effizient und gleichzeitig realitätsnah erwies sich die konstante CO2-Beaufschlagung mit 3 Vol.-% CO2 mit zusätzlichem, moderatem Gasdruck. Das hier entwickelte Verfahren kann daher genutzt werden, um Betone schnell und effizient in zeitraffenden Materialtests hinsichtlich Carbonatisierungswiderstand zu charakterisieren. KW - Beton KW - Carbonatisierung KW - Prüfverfahren KW - Gasdruck KW - Permeation Y1 - 2023 U6 - https://doi.org/10.1002/cepa.3005 SN - 2509-7075 VL - 6 IS - 6 SP - 1348 EP - 1357 PB - Ernst & Sohn CY - Berlin ER -