@article{58620, author = {{Dehn, Freya}}, journal = {{Sprache im Beruf}}, number = {{2}}, pages = {{243--246}}, title = {{{Freya Dehn (Universität Paderborn) rezensiert: Ariane Steuber: Tätigkeit und Sprache. Zur Didaktik inklusiver Sprachförderung in der Berufsvorbereitung (Beiträge zur Sonderpädagogik, 32)}}}, volume = {{7}}, year = {{2024}}, } @article{58309, abstract = {{This study evaluates four widely used fracture simulation methods, comparing their computational expenses and implementation complexities within the finite element (FE) framework when employed on heterogeneous solids. Fracture methods considered encompass the intrinsic cohesive zone model (CZM) using zero-thickness cohesive interface elements (CIEs), the standard phase-field fracture (SPFM) approach, the cohesive phase-field fracture (CPFM) approach, and an innovative hybrid model. The hybrid approach combines the CPFM fracture method with the CZM, specifically applying the CZM within the interface zone. The finite element model studied is characterized by three specific phases: inclusions, matrix, and the interface zone. This case study serves as a potential template for meso- or micro-level simulations involving a variety of composite materials. The thorough assessment of these modeling techniques indicates that the CPFM approach stands out as the most effective computational model, provided that the thickness of the interface zone is not significantly smaller than that of the other phases. In materials like concrete, which contain interfaces within their microstructure, the interface thickness is notably small when compared to other phases. This leads to the hybrid model standing as the most authentic finite element model, utilizing CIEs within the interface to simulate interface debonding. A significant finding from this investigation is that within the CPFM method, for a specific interface thickness, convergence with the hybrid model can be observed. This suggests that the CPFM fracture method could serve as a unified fracture approach for multiphase materials when a specific interfacial thickness is used. In addition, this research provides valuable insights that can advance efforts to fine-tune material microstructures. An investigation of the influence of interfacial material properties, voids, and the spatial arrangement of inclusions shows a pronounced effect of these parameters on the fracture toughness of the material.}}, author = {{Najafi Koopas, Rasoul and Rezaei, Shahed and Rauter, Natalie and Ostwald, Richard and Lammering, Rolf}}, issn = {{2076-3417}}, journal = {{Applied Sciences}}, number = {{1}}, publisher = {{MDPI AG}}, title = {{{Comparative Analysis of Phase-Field and Intrinsic Cohesive Zone Models for Fracture Simulations in Multiphase Materials with Interfaces: Investigation of the Influence of the Microstructure on the Fracture Properties}}}, doi = {{10.3390/app15010160}}, volume = {{15}}, year = {{2024}}, } @inproceedings{58648, author = {{Unruh, Roland and Böcker, Joachim and Schafmeister, Frank}}, booktitle = {{Proceedings of the Energy Conversion Congress & Expo (ECCE Europe)}}, location = {{Darmstadt}}, publisher = {{IEEE}}, title = {{{Experimentally Verified 22 kW, 40 kHz LLC Resonant Converter Design with new Control for a 1 MW Cascaded H-Bridge Converter}}}, doi = {{10.1109/ECCEEurope62508.2024.10751954}}, year = {{2024}}, } @article{57305, author = {{Gräßler, Iris and Pottebaum, Jens and Grewe, Benedikt}}, journal = {{VDI Konstruktion}}, pages = {{60--61}}, title = {{{Forschen für die Zukunft der Produktentstehung. Innovation erleben und validieren}}}, volume = {{76}}, year = {{2024}}, } @misc{51149, author = {{Reimer, Jens and Massopo, Orlando and Schmid, Hans-Joachim}}, title = {{{Entwicklung einer Datenbank hergestellter Nanomaterialien mittels Gasphasensynthese (Studienarbeit)}}}, year = {{2024}}, } @unpublished{58663, abstract = {{We present a general and intuitive ambiguity model for intersections, junctions and other structures in binary edge images. The model is combined with edge tracing, where edges are ordered sequences of connected pixels. The objective is to provide a versatile preprocessing method for tasks such as figure-ground segmentation, object recognition, topological analysis, etc. By using only a small set of straightforward principles, the results are intuitive to describe. This helps to implement subsequent processing steps, such as resolving ambiguous edge connections at junctions. By using an augmented edge map, neighboring edges can be directly accessed using quick local search operations. The edge tracing uses recursion, which leads to compact programming code. We explain our algorithm using pseudocode, compare it with related methods, and show how simple modular postprocessing steps can be used to optimize the results. The complete algorithm, including all data structures, requires less than 50 lines of pseudocode. We also provide a C++ implementation of our method.}}, author = {{Hennig, Markus and Leineke, Marc and Mertsching, Bärbel}}, booktitle = {{arXiv:2408.01712}}, title = {{{A General Ambiguity Model for Binary Edge Images with Edge Tracing and its Implementation}}}, year = {{2024}}, } @book{58684, abstract = {{Die Forschung zum kindlichen Wortlernen hat in den letzten Jahren aufgezeigt, dass der Erwerb eines neuen Wortes durch Prozessualität gekennzeichnet ist. Ein aktuelles Forschungsinteresse richtet sich in diesem Zusammenhang auf die Frage, inwieweit die längerfristigen kontextuellen Gegebenheiten diesen Lernprozess beeinflussen und ob der Erwerbsprozess durch stabile kontextuelle Bedingungen oder durch kontextuelle Variabilität begünstigt wird. Während sich bisherige Arbeiten in dieser Hinsicht vornehmlich auf isolierte Kontextfaktoren konzentrierten, rückt dieser Band die rahmende soziale Handlung und die beteiligten interaktiven Prozesse in den Mittelpunkt. Er zielt darauf ab, die Auswirkungen langfristiger Kontextbedingungen auf das Wortlernen von Vorschulkindern mit sozialen Robotern und menschlichen Interaktionspartnern systematisch zu untersuchen.}}, author = {{Tolksdorf, Nils Frederik}}, isbn = {{9783381114528}}, publisher = {{A. Francke Verlag}}, title = {{{Wortlernen mit sozialen Robotern}}}, doi = {{10.24053/9783381114528}}, year = {{2024}}, } @inproceedings{58685, abstract = {{In quantitativen Fragebogenstudien arbeiten Forschende mit großen Datensätzen, bei deren Erhebung sie häufig auf Online-Fragebögen anstelle der klassischen Paper-Pencil-Fragebögen setzen. Forschende bevorzugen diese Art der Datenerhebung, da die Daten direkt nach der Eingabe digitalisiert sind; zu bedenken ist aber auch, dass Online-Fragebögen komplexer sind und mehr Vorbereitung benö'gen als Paper-Pencil-Fragebögen. In diesem Workshop werden die Tools LimeSurvey und SoSci Survey vorgestellt, wobei der Fokus zum einen auf „klassischen“ Umfragen (LimeSurvey) und zum anderen auf Experimenten wie Akzeptabilitätsurteilen (SoSci Survey) liegen wird. Außerdem werden wir Vor- und Nachteile, Darstellungs- und Designanforderungen sowie Dos und Don’ts bei der Erstellung von Online-Fragebögen behandeln. Wenn Sie bereits einen eigenen Fragebogen erstellt haben und diesen gerne in LimeSurvey oder SoSci Survey erstellen möchten, bringen Sie ihn gerne zum Workshop mit. Zur Vorbereitung auf den Workshop sollten Sie einen Account bei LimeSurvey (https://www.limesurvey.org/de) und/oder SoSci Survey (https://www.soscisurvey.de/) erstellen. Sollte Ihre Universität über eine eigene LimeSurvey- oder SoSci Survey-Lizenz verfügen, können Sie auch dort einen Account anlegen. Empfehlenswert ist ferner, sich im Vorfeld das DGFF-Kolleg-Webinar von Henning Rossa zum Thema Fragebogen (https://www.dgff.de/fragebogen-henning-rossa/) anzuschauen.}}, author = {{Hambach, Dennis and Gövert, Andre}}, location = {{Paderborn / Bielefeld}}, title = {{{Hands‐on‐Workshop: Online‐Fragebogen}}}, year = {{2024}}, } @article{58698, abstract = {{ Background/Purpose Return to sport decision-making may be improved by assessing an athlete’s ability to coordinate movement with opponents in sport. The purpose was to investigate whether previous injuries associated with female soccer players’ interpersonal coordination during a collision avoidance task. The authors hypothesized that external perturbations would disrupt the strength and stability of coordinated movement, and that individuals with a history of injury would be less likely to recover coordinated movement. Study Design Cross-Sectional Methods Nine female athletes with a history of lower extremity injuries and nine without injuries were paired into dyads. Each dyad completed twenty trials of an externally paced collision-avoidance agility task with an unanticipated perturbation. Participant trajectories were digitized and analyzed using cross-recurrence quantification analysis (CRQA) to determine the strength and stability of interpersonal coordination dynamics. Trials in which participants with injury history assumed leader or follower roles within each dyad were then used to study how dyadic coordination varied across task stages (early, perturbation, and late) using linear mixed effect models. Cohen’s d effect sizes were calculated to demonstrate magnitude of differences. In exploratory analysis, psychological readiness (i.e., self-reported knee functioning, fear of injury, and risk-taking propensity) was evaluated for their association with leader-follower status. Results Perturbation disrupted the strength (R2=0.65, p<0.001, early=49.7±1.7, perturbation=41.1±1.7, d=0.39) and stability (R2=0.71, p < 0.001, early=65.0±1.6, perturbation=58.0±1.7, d=0.38) of interpersonal coordination regardless of leader-follower status. Individuals with injury history failed to restore coordination after the perturbation compared to control participants (injury=44.2.0±2.1, control=50.8±2.6, d=0.39). Neither demographic nor psychological measures were associated with leader-follower roles (B=0.039, p=0.224). Conclusion Individuals with a history of lower extremity injury may have a diminished ability to adapt interpersonal coordination to perturbations, possibly contributing to a higher risk of re-injury. Level of Evidence 3 }}, author = {{Fernandes, Courtney A and Norte, Grant E and Schwab, Sarah M and Gokeler, Alli and Murray, Amanda and Bazett-Jones, David M and Sherman, David A}}, issn = {{2159-2896}}, journal = {{International Journal of Sports Physical Therapy}}, number = {{5}}, publisher = {{International Journal of Sports Physical Therapy}}, title = {{{Interpersonal Coordination between Female Soccer Players: Leader-Follower Roles within a Collision-Avoidance Task}}}, doi = {{10.26603/001c.116156}}, volume = {{19}}, year = {{2024}}, } @article{58697, abstract = {{ Context Although the landing phases of the single-leg hop for distance (SLHD) are commonly assessed, limited work reflects how the take-off phase influences hop performance in patients with anterior cruciate ligament reconstruction (ACLR). Objective To compare trunk and lower extremity biomechanics between individuals with ACLR and matched uninjured controls during take-off of the SLHD. Design Cross-sectional study design. Setting Laboratory setting. Patients or Other Participants Sixteen individuals with ACLR and 18 uninjured controls. Main Outcome Measure(s) Normalized quadriceps isokinetic torque, hop distance, and respective limb symmetry indices were collected for each participant. Sagittal and frontal kinematics and kinetics of the trunk, hip, knee, and ankle as well as vertical and horizontal ground reaction forces were recorded for loading and propulsion of the take-off phase of the SLHD. Results Those with ACLR had weaker quadriceps peak torque in the involved limb (P = .001) and greater strength asymmetry (P &lt; .001) than control individuals. Normalized hop distance was not statistically different between limbs or between groups (P &gt; .05), and hop distance symmetry was not different between groups (P &gt; .05). During loading, the involved limb demonstrated lesser knee flexion angles (P = .030) and knee power (P = .007) than the uninvolved limb and lesser knee extension moments than the uninvolved limb (P = .001) and controls (P = .005). During propulsion, the involved limb demonstrated lesser knee extension moment (P = .027), knee power (P = .010), knee (P = .032) and ankle work (P = .032), and anterior-posterior ground reaction forces (P = .047) and greater knee (P = .016) abduction excursions than the uninvolved limb. Conclusions Between-limb differences in SLHD take-off suggest a knee underloading strategy in the involved limb. These results provide further evidence that distance covered during SLHD assessment can overestimate function and fail to identify compensatory biomechanical strategies. }}, author = {{Rush, Justin L. and Murray, Amanda M. and Sherman, David A. and Gokeler, Alli and Norte, Grant E.}}, issn = {{1938-162X}}, journal = {{Journal of Athletic Training}}, number = {{11}}, pages = {{1100--1109}}, publisher = {{Journal of Athletic Training/NATA}}, title = {{{Single-Leg Hop Performance After Anterior Cruciate Ligament Reconstruction: Ready for Landing but Cleared for Take-Off?}}}, doi = {{10.4085/1062-6050-0628.23}}, volume = {{59}}, year = {{2024}}, } @article{58700, abstract = {{AbstractPurposeThe study aimed to evaluate the impact of neurocognitive reliance on jump distance and lower extremity kinematics in individuals who had undergone anterior cruciate ligament reconstruction (ACLR). This was achieved by comparing hop performance under standard and neurocognitive conditions.MethodsThirty‐two patients after ACLR and 32 healthy controls (CTRL) participated. Both groups performed a single‐leg hop for distance (SLHD) and two neurocognitive hop tests, each designed to evaluate distinct aspects of neurocognition. The neurocognitive tests included the reaction SLHD (R‐SLHD), measuring reaction to a central stimulus and working memory SLHD (WM‐SLHD) assessing response to a memorized stimulus amidst distractor stimuli. Distances were assessed for the three‐hop tests. In addition, joint kinematics were collected to calculate lower extremity coordination of the lower extremity. SLHD performance was defined as the mean hop distance per condition per leg for each participant and was analyzed using a mixed ANOVA with condition and leg as the within‐subjects factors and the group (ACLR or CTRL) as the between‐subjects factor. Differences in joint coordination variability were analyzed using two‐sample t‐test statistical parametric mapping (SPM) with linear regression.ResultsThe WM‐SLHD resulted in a significantly decreased jump distance compared with the standard hop test both for ACLR and CTRL. Furthermore, the leg difference within the ACLR group increased under higher cognitive load as tested with the WM‐SLHD, indicating leg‐specific adaptations in lower extremity coordination.ConclusionsNeurocognitive single‐leg hop tests resulted in reduced jump distance in CTRL and ACLR. The neurocognitive hop test revealed changes in coordination variability for the CTRL and the uninjured leg of ACLR individuals, whereas the injured leg's coordination variability remained unaltered, suggesting persistent cognitive control of movements post‐ACLR.Level of EvidenceLevel III.}}, author = {{Gokeler, Alli and Zandbergen, Marit A. and Hoogeslag, Roy A. G. and Houten Van, Albert van and Nijmeijer, Eline M. and Heuvelmans, Pieter}}, issn = {{0942-2056}}, journal = {{Knee Surgery, Sports Traumatology, Arthroscopy}}, publisher = {{Wiley}}, title = {{{Neurocognitive demands reduce jump distance and coordination variability of the injured leg in athletes after anterior cruciate ligament reconstruction}}}, doi = {{10.1002/ksa.12439}}, year = {{2024}}, } @article{58695, abstract = {{Abstract Benjaminse, A, Nijmeijer, EM, Gokeler, A, Broekhaar, DC, and Cortes, N. Motivation unraveled: giving choice to football players to improve anterior cruciate ligament injury prevention. J Strength Cond Res XX(X): 000–000, 2024—Providing athletes some control over a training session facilitates motor skill acquisition. This is a promising concept to use in anterior cruciate ligament (ACL) injury prevention, as the key for risk reduction is to improve quality of movement. The goal of this study was to better understand why improved motor learning occurred when football players had the opportunity to choose when to receive feedback when practicing sidestep cutting (SSC) movements. Healthy male recreational football players (n = 22, 22.9 ± 1.7 years, 185.5 ± 7.2 cm, 79.3 ± 9.2 kg) were included and assigned to the self-control (SC) or the yoked (YK) group. The players performed anticipated and unanticipated SSC. They received video instructions and were instructed to “copy the movement of the model to the best of their ability.” During the training blocks, the SC group could ask for feedback, whereas the YK group could not. Cutting movement assessment scores (CMAS) were measured to test quality of movement and the Intrinsic Motivation Inventory was administered to measure constructs of motivation. In the anticipated condition, SC group showed better scores in immediate post and the retention test compared with pretest (p < 0.001), whereas the YK group showed worse scores in the retention test compared with immediate posttest (p = 0.001). Perceived competence (p = 0.017) and self-efficacy (p = 0.032) were consistent factors that correlated with improved CMAS in the SC group. This has given us innovative insights into underlying mechanisms optimizing the quality of movement, necessary to improve current ACL injury prevention approaches.}}, author = {{Benjaminse, Anne and Nijmeijer, Eline M. and Gokeler, Alli and Broekhaar, Dara C. and Cortes, Nelson}}, issn = {{1064-8011}}, journal = {{Journal of Strength & Conditioning Research}}, publisher = {{Ovid Technologies (Wolters Kluwer Health)}}, title = {{{Motivation Unraveled: Giving Choice to Football Players to Improve Anterior Cruciate Ligament Injury Prevention}}}, doi = {{10.1519/jsc.0000000000004912}}, year = {{2024}}, } @article{58696, author = {{Tortoli, Emanuele and Gokeler, Alli and Tak, Igor and Pellicciari, Leonardo and Norte, Grant}}, issn = {{0112-1642}}, journal = {{Sports Medicine}}, number = {{10}}, pages = {{2531--2556}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Is Visual Reliance Increased in Athletes After ACL Injury? A Scoping Review}}}, doi = {{10.1007/s40279-024-02085-2}}, volume = {{54}}, year = {{2024}}, } @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{58701, abstract = {{Laboratory studies have limitations in screening for anterior cruciate ligament (ACL) injury risk due to their lack of ecological validity. Machine learning (ML) methods coupled with wearable sensors are state-of-art approaches for joint load estimation outside the laboratory in athletic tasks. The aim of this study was to investigate ML approaches in predicting knee joint loading during sport-specific agility tasks. We explored the possibility of predicting high and low knee abduction moments (KAMs) from kinematic data collected in a laboratory setting through wearable sensors and of predicting the actual KAM from kinematics. Xsens MVN Analyze and Vicon motion analysis, together with Bertec force plates, were used. Talented female football (soccer) players (n = 32, age 14.8 ± 1.0 y, height 167.9 ± 5.1 cm, mass 57.5 ± 8.0 kg) performed unanticipated sidestep cutting movements (number of trials analyzed = 1105). According to the findings of this technical note, classification models that aim to identify the players exhibiting high or low KAM are preferable to the ones that aim to predict the actual peak KAM magnitude. The possibility of classifying high versus low KAMs during agility with good approximation (AUC 0.81–0.85) represents a step towards testing in an ecologically valid environment.}}, author = {{Benjaminse, Anne and Nijmeijer, Eline M. and Gokeler, Alli and Di Paolo, Stefano}}, issn = {{1424-8220}}, journal = {{Sensors}}, number = {{11}}, publisher = {{MDPI AG}}, title = {{{Application of Machine Learning Methods to Investigate Joint Load in Agility on the Football Field: Creating the Model, Part I}}}, doi = {{10.3390/s24113652}}, volume = {{24}}, year = {{2024}}, } @inbook{50826, author = {{Spener, Anna Maria}}, booktitle = {{Chronistin und Kritikerin der Moderne. Zum Werk Gabriele Tergits}}, editor = {{Banki, Luisa and Sucker, Juliane}}, pages = {{109--131}}, publisher = {{J.B. Metzler Verlag}}, title = {{{Von Exklusivität und Exklusion. Zum jüdischen Berlin in Gabriele Tergits "Effingers"}}}, year = {{2024}}, } @article{58747, abstract = {{AbstractAlthough achievement situations trigger multiple emotions and learners experience both negative and positive emotions simultaneously, procrastination research typically examines isolated relationships between specific emotions and procrastination. The potential interplay of negative and positive emotions regarding procrastination is often overlooked, although this perspective can shed light on their dynamic relationships. Moreover, past studies primarily address the behavioral aspect of procrastination (delay) while overlooking its emotional facet (subjective discomfort), albeit this differentiation could enhance understanding of procrastination and its correlates. The present study explores the understudied interplay of the two most frequently experienced negative (anxiety) and positive (hope) exam-related emotions regarding students’ procrastination tendencies with differentiated behavioral and emotional dimensions. The study analyzes cross-sectional data from two independent studies (Nstudy1 = 266, Nstudy2 = 468) conducted in Germany among university students. Latent profile analyses (LPA) reveal three similar profiles across both studies—High Anxiety–Low Hope, Low Anxiety–High Hope and Moderate Anxiety–Moderate Hope— and two study-specific profiles namely, Low Anxiety–Moderate Hope (Study 1) and High Anxiety–Moderate Hope (Study 2). Females compared to males are more likely to belong to the anxiety-dominated profiles. Overall, students in anxiety-dominated profiles report higher scores whereas students in hope-dominated profiles report lower scores on both behavioral and emotional dimensions of academic procrastination. This study advances an integrated approach that incorporates the combined effects of both negative and positive emotions concerning procrastination. Findings further inform research efforts towards identifying risk and protective emotional factors to develop tailored intervention against academic procrastination.}}, author = {{Gadosey, Christopher K. and Turhan, Derya and Wenker, Theresa and Kegel, Lena S. and Bobe, Julia and Thomas, Laura and Buhlmann, Ulrike and Fries, Stefan and Grunschel, Carola}}, issn = {{1046-1310}}, journal = {{Current Psychology}}, number = {{40}}, pages = {{31476--31494}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Relationship between the intraindividual interplay of negative and positive exam-related emotions and the behavioral-emotional dimensions of academic procrastination}}}, doi = {{10.1007/s12144-024-06719-6}}, volume = {{43}}, year = {{2024}}, } @phdthesis{58756, abstract = {{Der Permanentmagnet-Synchronmotor (PMSM) ist aufgrund seiner hohen Leistungs- und Drehmomentdichte bezogen auf Volumen und Gewicht ein häufig verwendeter Traktionsmotor in Automobilanwendungen. Jene Charakteristika werden jedoch maßgeblich durch Temperaturhöchstwerte begrenzt. Hinzu kommt, dass die Temperatur wichtiger Rotorkomponenten nicht wirtschaftlich messbar ist. Temperaturschätzverfahren wie modellbasierte Ansätze sind potentiell in der Lage, das Problem der fehlenden Temperaturinformation zu relativieren, ohne zusätzliche Geräte zu erfordern. Diese Arbeit stellt ein Portfolio von thermischen Modellen aus dem Bereich des maschinellen Lernens zusammen. Die Untersuchung basiert auf einem PMSM-Datensatz, der auf einem Prüfstand aufgezeichnet wurde. Neben dem durchschnittlichen Schätzfehler diktiert die erforderliche Anzahl von Modellparametern zahlreiche Auslegungsentscheidungen. Der gesamte Entwurfsprozess eines Modells aus dem maschinellen Lernen wird beleuchtet und für verschiedene lineare, sowie baumbasierte Modelle; vorschiebende, rekurrente und faltende neuronale Netze als auch für verschiedene hybride Modellierungsansätze durchgeführt. Desweiteren wird der hybride Modellierungsansatz über thermische neuronale Netze besonders hervorgehoben. Sie setzen sich aus neuronalen Netzen und einem thermischen Ersatzschaltbild zusammen und wurden erstmals vom Autor dieser Arbeit veröffentlicht. Schließlich wird ein von Experten entworfenes, datengetriebenes thermisches Netz mit konzentrierten Parametern über verschiedene Algorithmen optimiert und als Stand der Technik herangezogen.}}, author = {{Kirchgässner, Wilhelm}}, publisher = {{LibreCat University}}, title = {{{Data-driven thermal modeling of a permanent magnet synchronous motor with machine learning}}}, doi = {{10.17619/UNIPB/1-2068}}, year = {{2024}}, } @phdthesis{58757, abstract = {{On-bord DC-DC-Konverter sind das Bindeglied zwischen der Traktionsbatterie und der Hilfsbatterie und versorgen wichtige Komponenten des Elektrofahrzeugs. Diese Arbeit adressiert den weiten Spannungsbereich des Wandlers, der eine Folge der variierenden Spannungen der Batterien ist. Als potentielle Topologien werden der LLC Resonanzwandler, der aktiv geklemmte Flusswandler und der isolierte Vollbrücken-Konverter untersucht.Zunächst wird hierbei der LLC untersucht und verschiedene Modulationstechniken zur Abdeckung des weiten Spannungsbereichs gegenübergestellt, um zu zeigen, dass die Frequenzverdoppler-Modulation und die alternierende Phasenverschiebungsmodulation die maximale Temperatur der Halbleiter deutlich senken. Zum Wechsel zwischen Voll- und Halbbrückenmodulation wird eine Modulationstechnik vorgeschlagen, welche den transienten Magnetisierungsfluss um über 70 % respektive des konventionellen Konzept senkt. Für den aktiv geklemmten Flusswandler wird ein verbessertes Modell vorgestellt, das die Blockierspannung sehr genau modelliert. Zudem wird eine Snubber-Schaltung vorgeschlagen, welche die sekundärseitige transiente Blockierspannung deutlich reduziert. Für den isolierten Vollbrücken-Konverter werden hart- und weichschaltende Modulationstechniken analysiert und eine hartschaltende Frequenz-Verdoppler-Modulationstechnik vorgeschlagen, welche die maximale Schaltertemperatur deutlich reduziert und eine Modulationstechnik mit Beschaltung vorgestellt, um zwischen dem Voll- und Halbbrückenmodus zu wechseln. Die zuvor erarbeiteten Konverter werden unter Anwendung einer vorgestellten Designmethodik verglichen und messtechnisch evaluiert.}}, author = {{Rehlaender, Philipp}}, publisher = {{LibreCat University}}, title = {{{Single-stage DC-DC converters for a wide input & output voltage range}}}, doi = {{10.17619/UNIPB/1-2148}}, year = {{2024}}, } @article{58758, abstract = {{AbstractThe advantages of implementing demand side management (DSM) strategies in biogas production are explored. Specifically, the influence of agitation intervals on biogas production and the economic advantages of DSM in fermenter agitation are examined. The model‐based study highlights the detrimental effects of insufficient agitation, such as reduced active reaction volume and diminished biogas yield. The article further delves into the optimal agitation intervals corresponding to different electricity price levels and assesses the implications of DSM on biogas production. Results substantiate that such strategies, particularly at high and low electricity prices, can increase profit while reducing greenhouse gas emissions.}}, author = {{Röder, Lilli Sophia and Gröngröft, Arne and Dotzauer, Martin and Grünewald, Marcus and Riese, Julia}}, issn = {{0009-286X}}, journal = {{Chemie Ingenieur Technik}}, number = {{1-2}}, pages = {{51--62}}, publisher = {{Wiley}}, title = {{{Economic and Ecological Evaluation of Demand Side Management in Biogas Production – A Dynamic Simulation Approach*}}}, doi = {{10.1002/cite.202300157}}, volume = {{97}}, year = {{2024}}, }