TY - GEN A1 - Maiwald, Frederik A1 - Schulze, Julian A1 - Schmidt, Michael A1 - Hierl, Stefan T1 - In-situ optical coherence tomography for spatio-temporal analysis of melt pool crystallization in absorber-free laser transmission welding of polymers T2 - The 9th International Congress on Laser Advanced Materials Processing (LAMP2025), Ise-city, Mie-prefecture, Japan, June 10 to June 13, 2025 Y1 - 2025 PB - Japan Laser Processing Society ER - TY - GEN A1 - Meisner, Dennis A1 - Kaftiranis, Nikitas A1 - Maiwald, Frederik A1 - Rapp, Petra A1 - Hierl, Stefan T1 - Enhancing Layer Adhesion in Material Extrusion AM with Adaptive Laser Preheating Integrated in Printhead T2 - LiM Conference 2025, Lasers in Manufacturing, June 23 - 26, 2025, Munich, Germany N2 - Material extrusion is a widely used AM process and is gaining more acceptance in industry applications due to its material variety, flexibility, and low cost. However, its usage is limited by a process-related anisotropy caused by insufficient interlayer bonding due to reduced temperature in the process zone. To enhance layer adhesion, an adaptive laser preheating system is integrated in a conventional printhead around the extrusion nozzle. The setup with eight fiber coupled diode laser allows preheating in feed direction and investigation of various intensity profiles. The article describes the experimental setup and significant improvements achieved. Laser preheating with different intensity distributions (spot, sickle or ring shaped) show an incasement of up to 85 % of the mechanical properties in the build-up direction. However, due to the additional energy input by the laser, controlled cooling of the workpiece becomes a crucial factor and is investigated as well. Y1 - 2025 UR - https://www.wlt.de/lim-conference PB - Wissenschaftliche Gesellschaft Lasertechnik und Photonik e.V. ER - TY - INPR A1 - Schulz, Carsten A1 - Graneß, Henry A1 - Weinzierl, Stefan A1 - Nicklas, Johannes T1 - Eigenvalue perturbation in drivetrain analysis and optimization N2 - The optimization of the dynamic behavior of drive systems often involves targeted modifications of the system characteristics. Structural and parametric modifications are used to satisfy the constraints of the dynamic requirements. However, many optimizations are still achieved by intuition or parameter variations, even though more streamlined and easy-to-implement tools such as the eigenvalue perturbation method are available. In this article, the eigenvalue perturbation method in the form of an eigenvalue sensitivity analysis is used to efficiently optimize the dynamic behavior for two different use cases using different optimization measures. This paper demonstrates, how eigenvalue perturbation theory can efficiently optimize drivetrain dynamics by systematically modifying system parameters. Two case studies show how eigenvalue sensitivity analysis achieves targeted frequency shifts to avoid resonances: (1) adapting shaft stiffness and control parameters in a torsional drivetrain, and (2) optimizing structural modifications in a wind turbine bedplate. The study introduces the eigenvector tensor product as a weighting matrix, identifying key parameters for effective redesign. Compared to conventional parameter studies, this method enables precise control over system dynamics with minimal computational effort, making it highly applicable for vibration mitigation and drivetrain optimization. Y1 - 2025 U6 - https://doi.org/10.21203/rs.3.rs-6368754/v1 PB - Research Square Platform LLC ER - TY - INPR A1 - Vogl, Yannick A1 - Schulz, Carsten A1 - Schaeffer, Thomas A1 - Geiger, Benjamin T1 - Prediction of the wear behavior of a conveyor belt with flexible rollers N2 - This paper introduces a method to predict wear behavior in conveyor belt systems using a lumped mass modeling approach. While previous research has focused primarily on lateral belt walking, this study shifts attention to belt deformation and its associated wear. Both significantly affect system efficiency and component lifespan. The authors propose using local frictional power as a wear indicator, leveraging its direct relation to frictional work in established wear models. To validate the method, the study simulates a conveyor belt with three flexible rollers and a deformable belt modeled through rigid spheres connected by spring-damper elements. The authors quantify and visualize frictional power density across the belt width, distinguishing between running and transverse directions. The results demonstrate that the frictional power distribution depends heavily on discretization quality, particularly due to the polygon effect inherent in the lumped mass approach. A convergence analysis reveals a minimum discretization of nine sphere rows with 557 spheres per row to achieve reliable qualitative insights. This method enables researchers to evaluate wear distribution in flexible conveyor systems and adapt the approach for broader applications in multibody dynamics. Future work should refine discretization techniques and friction models to enhance quantitative accuracy. Y1 - 2025 U6 - https://doi.org/10.21203/rs.3.rs-6343500/v1 N1 - Der Aufsatz wurde peer-reviewed veröffentlicht und ist ebenfalls in diesem Repositorium verzeichnet unter: https://opus4.kobv.de/opus4-oth-regensburg/8489 PB - Research Square Platform LLC ER - TY - CHAP A1 - Strassburger, Steffen A1 - Galka, Stefan A1 - Lang, Sebastian A1 - Reggelin, Tobias ED - Bui, Tung T1 - Introduction to the Minitrack on Simulation Modeling, Artificial Intelligence and Digital Twins for Decision Making in Production and Logistics T2 - Proceedings of the 58th Hawaii International Conference on System Sciences, January 7-10, 2025, Honolulu, Hawaii N2 - The minitrack contains contributions with a focus on simulation modeling and digital twins and decision making in the context of Industry 4.0. The use of simulation models and digital twins is manifold, from planning to virtual commission and real-time operational decision support. Cyber-physical systems integrate the real world and the virtual world to enable decision making in the age of Industry 4.0. For example, customer decisions and supply disruptions which directly influence manufacturing and logistics systems require immediate decisions. Thus, models must have the capability to support decision making in manufacturing as well as in internal and external logistics in real-time. Methods include discrete-event simulation, discrete-rate simulation, hybrid simulation, system dynamics simulation, the combination of simulation modeling with machine learning or optimization heuristics, prescriptive analytics, and adaptive systems. Furthermore, this minitrack addresses simulation education and simulation models and digital twins used for education and training in manufacturing and logistics. Y1 - 2025 SN - 978-0-9981331-8-8 U6 - https://doi.org/10.24251/HICSS.2025.205 SP - 1677 EP - 1678 PB - University of Hawaii at Manoa ER - TY - INPR A1 - Lehrer, Tobias A1 - Stocker, Philipp A1 - Duddeck, Fabian A1 - Wagner, Marcus T1 - UCSM: Dataset of U-Shaped Parametric CAD Geometries and Real-World Sheet Metal Meshes for Deep Drawing N2 - The development of machine learning (ML) applications in deep drawing is hindered by limited data availability and the absence of open-access benchmarks for validating novel approaches, including domain generalization over distinct geometries. This paper addresses these challenges by introducing a comprehensive U-shaped dataset tailored to this manufacturing process. Our U-Channel sheet metal (UCSM) dataset combines 90 real-world meshes with an infinite number of synthetic geometry samples generated from four parametric Computer-Aided Design (CAD) models, ensuring extensive geometry variety and data quantity. Additionally, a ready-to-use dataset for drawability assessment and segmentation is provided. Leveraging CAD and mesh data sources bridges the gap between sparse data availability and ML requirements. Our analysis demonstrates that the proposed parametric models are geometrically valid, and real-world and synthetic data complement each other effectively, providing robust support for ML model development. While the dataset is confined to U-shaped, thin-walled, deep drawing scenarios, it considerably aids in overcoming data scarcity. Thereby, it facilitates the validation and comparison of new geometry-generalizing ML methodologies in this domain. By providing this benchmark dataset, we enhance the comparability and validation of emerging methods for ML advancements in sheet metal forming. Y1 - 2025 U6 - https://doi.org/10.2139/ssrn.5268323 N1 - Zugehöriges Datenset: https://doi.org/10.5281/zenodo.15327950 PB - SSRN ER - TY - JOUR A1 - Maier, Eva A1 - Zentgraf, Jan A1 - Angele, Eveline A1 - Zorzin, José A1 - Taschner, Michael A1 - Widbiller, Matthias A1 - Galler, Kerstin A1 - Schratzenstaller, Thomas T1 - A re-usable 3D-printed training model for the endodontic management of dental trauma in immature teeth JF - International endodontic journal N2 - AIM: To develop a 3D-printed model enabling treatment simulation of trauma-related endodontic and restorative procedures like revitalization or placement of an apical plug on teeth with incomplete root formation. METHODOLOGY: To generate a realistic training model suitable for trauma-related simulations, CT-Data sets were segmented, combined, adjusted and optimized using computer-aided design features. Specific focus was on optimally reflecting characteristics of immature teeth like open apical foramina and thin root walls. For reflection of the revitalization process, a set-up including a tube filled with red liquid under pressure was developed to be perforated during the procedure by the trainee, simulating bleeding from the apical papilla into the root canal system. Design was based on a combination of cost-effective simple parts combined with 3D-printed components to achieve maximal accessibility, exchangeability and re-usability. Model assembly and preparation were described in step-by-step instructions. RESULTS: As a result of the developmental process, the presented model qualifies for the training of the endodontic management of complications on immature teeth after dental trauma. Step-by-step descriptions aligned with the clinical procedures are performable for a revitalization procedure, for pulpotomy followed by fragment re-attachment and splint application and for placement of an apical plug using hydraulic calcium silicate cements. CONCLUSIONS: The model successfully achieved its intended objectives, so that it may be used in the future in various dental trauma treatment simulations for undergraduate and postgraduate education on the endodontic management of trauma-related therapies in immature teeth. Its common manufacturing process, affordability and re-usability support accessibility and sustainability. Y1 - 2025 U6 - https://doi.org/10.1111/iej.14235 SN - 1365-2591 VL - 2025 PB - Wiley ER - TY - JOUR A1 - Weilhammer, Theresa A1 - Warren, Hunter S. A1 - Bliznyuk, Valery A1 - Kutsevol, Nataliya A1 - Booth, Brian W. T1 - Analysis of Photodynamic Therapeutic Treatment of HER2-Positive Breast Cancer In Vitro JF - BioNanoScience N2 - Photodynamic therapy (PDT) is a minimally invasive cancer treatment method. The antitumor effect of PDT mediated by the photosensitizer meta-tetra(hydroxyphenyl)chlorin (m-THPC) was studied in vitro on HER2-positive (HER2+) breast cancer cells. Since the application of m-THPC is limited due to poor tumor targeting abilities, the polymer carrier dextran-grafted-polyacrylamide (D-g-PAA) with attached gold nanoparticles was loaded with m-THPC to provide a light-responsive, tumor targeting nanocomposite. The nanocomposite was absorbed by the cancer cells within 90 min and activated through irradiation with red light at a wavelength of 660 nm. In this study, the efficiency and ideal dose of the nanocomposite were evaluated and determined based on cell viability and induction of apoptosis of HER2+ breast cancer cells and human breast epithelial cells. We demonstrate that the nanocomposite exhibited phototoxicity with cell mortality exceeding 50% for the HER2+ breast cancer cells. In contrast, the human breast epithelial cells were minimally affected at the same concentration of the nanocomposite, demonstrating the tumor-targeting abilities of the developed nanocomposite. Dark toxicity was also comparably lower, indicating the limited effect of the unactivated nanocomposite. The results revealed that apoptosis was the primary mode of cell death in HER2+ breast cancer cells. Apoptotic cell death was induced in HER2+ breast cancer cells via the caspase-3, caspase-9, and Bax pathways. In conclusion, the studied nanocomposite demonstrated excellent PDT performance with good antitumor activity under light irradiation in vitro and is worthy of further investigation as an alternative treatment for HER2+ breast cancer. Y1 - 2025 U6 - https://doi.org/10.1007/s12668-025-01940-4 VL - 15 PB - Springer ER - TY - JOUR A1 - Deuter, Daniel A1 - Haj, Amer A1 - Brawanski, Alexander A1 - Krenkel, Lars A1 - Schmidt, Nils Ole A1 - Doenitz, Christian T1 - Fast simulation of hemodynamics in intracranial aneurysms for clinical use JF - Acta Neurochirurgica N2 - BACKGROUND: A widely accepted tool to assess hemodynamics, one of the most important factors in aneurysm pathophysiology, is Computational Fluid Dynamics (CFD). As current workflows are still time consuming and difficult to operate, CFD is not yet a standard tool in the clinical setting. There it could provide valuable information on aneurysm treatment, especially regarding local risks of rupture, which might help to optimize the individualized strategy of neurosurgical dissection during microsurgical aneurysm clipping. METHOD: We established and validated a semi-automated workflow using 3D rotational angiographies of 24 intracranial aneurysms from patients having received aneurysm treatment at our centre. Reconstruction of vessel geometry and generation of volume meshes was performed using AMIRA 6.2.0 and ICEM 17.1. For solving ANSYS CFX was used. For validational checks, tests regarding the volumetric impact of smoothing operations, the impact of mesh sizes on the results (grid convergence), geometric mesh quality and time tests for the time needed to perform the workflow were conducted in subgroups. RESULTS: Most of the steps of the workflow were performed directly on the 3D images requiring no programming experience. The workflow led to final CFD results in a mean time of 22 min 51.4 s (95%-CI 20 min 51.562 s-24 min 51.238 s, n = 5). Volume of the geometries after pre-processing was in mean 4.46% higher than before in the analysed subgroup (95%-CI 3.43-5.50%). Regarding mesh sizes, mean relative aberrations of 2.30% (95%-CI 1.51-3.09%) were found for surface meshes and between 1.40% (95%-CI 1.07-1.72%) and 2.61% (95%-CI 1.93-3.29%) for volume meshes. Acceptable geometric mesh quality of volume meshes was found. CONCLUSIONS: We developed a semi-automated workflow for aneurysm CFD to benefit from hemodynamic data in the clinical setting. The ease of handling opens the workflow to clinicians untrained in programming. As previous studies have found that the distribution of hemodynamic parameters correlates with thin-walled aneurysm areas susceptible to rupture, these data might be beneficial for the operating neurosurgeon during aneurysm surgery, even in acute cases. Y1 - 2025 U6 - https://doi.org/10.1007/s00701-025-06469-9 VL - 167 PB - Springer ER - TY - CHAP A1 - Schaeffer, Leon A1 - Liebrecht, Melanie A1 - Schmaußer, Theresa A1 - Herrmann, David A1 - Lehmann, Lukas A1 - Böhm, Valter T1 - Finite element analysis of a tensegrity joint model for the use in dynamic hand orthoses T2 - 2025 9th International Conference on Biomedical Engineering and Applications (ICBEA), Seoul, Republic of Korea, February 27 - March 2, 2025 N2 - Many current dynamic hand orthoses use single degree of freedom joints, such as hinge joints. Consequently, these orthoses can only partially replicate the complex, multi-axis range of motion of the hand. To overcome this limitation, one approach is to use prestressed compliant structures as the basis for orthoses. In order to be able to map the dynamic influences on the orthosis as well as to simulate everyday use, this article provides an overview of this orthosis concept and the most important aspects in the development of such an orthosis including the results of the modal analysis. Based on these theoretical investigations, the presented methodological approach can be used to develop initial prototypes of tensegrity-based hand orthoses. KW - Hand orthosis KW - Modal Analysis KW - Tensegrity Joint Y1 - 2025 UR - https://ieeexplore.ieee.org/document/11018707 SN - 979-8-3315-3571-1 U6 - https://doi.org/10.1109/ICBEA66055.2025.00016 SP - 41 EP - 48 PB - IEEE ER - TY - JOUR A1 - Broll, Alexander A1 - Goldhacker, Markus A1 - Hahnel, Sebastian A1 - Rosentritt, Martin T1 - Morphological effects of input data quantity in AI-powered dental crown design JF - Journal of dentistry N2 - OBJECTIVES: This retrospective in vitro study evaluated the impact of input data quantity on the morphology of dental crowns generated by AI-based software. The hypothesis suggests that increased input data quantity improves the quality of generated occlusal surfaces. METHODS: A dataset comprising n=30 patients (11 males, 19 females; age: 22-31 years) was analyzed. Input data was categorized into full dentition (full), quadrant data (quad), and adjacent teeth (adj). AI-based software (Dentbird Crown, Imageworks Inc.) generated crowns for a single lower first molar (36/46). Metrics were proposed to assess the morphology and occlusal relationships of the crowns, with the original tooth as reference. STATISTICS: Friedman Chi-Square tests, Wilcoxon signed rank tests, Kendall correlation and Fligner-Killeen tests (α = 0.05). RESULTS: Full and quad groups provided consistent reconstruction quality with no significant differences in morphology and occlusal relationships. The adj group showed significant (p<0.05) morphological deviations and higher reconstruction failure rates compared to the full and quad groups. Correlations (median: 0.19; min-max range: 0.01-0.54) indicate that the proposed metrics capture distinct morphological and functional crown aspects. CONCLUSION: The software reliably reconstructed crowns with at least quadrant-level input data. Performance declined with reduced input. Full-jaw scans did not enhance accuracy compared to quadrant data. CLINICAL SIGNIFICANCE: Increased input data quantity can improve the accuracy of AI-based restorations. As a result, prosthodontists benefit from predictable, accurate restoration proposals that reduce the need for digital chairside adjustments as well as manual modifications after fabrication. This streamlines clinical workflows and enhances the quality of restorations. Quadrant-level data has proven sufficient to generate high-quality reconstructions. Further input data did not significantly improve the accuracy of the reconstructions. The proposed metrics enable quantitative assessments of morphological and functional restoration quality, supporting reliable AI-driven workflows. Y1 - 2025 U6 - https://doi.org/10.1016/j.jdent.2025.105767 VL - 159 SP - 1 EP - 8 PB - Elsevier ER - TY - CHAP A1 - Buchner, Stefan A1 - Wagner, Marcus A1 - Höller, Christoph T1 - Inverse Acoustic Characterization of Rigid Porous Media using Artificial Neural Networks T2 - Proceedings of DAS|DAGA 2025, 51st Annual Meeting on Acoustics, March 17-20, 2025, Copenhagen N2 - Porous sound absorbers can be described by the isotropic Biot model, and its fluid phase can be represented by the Champoux-Allard model. To apply these models to a given absorber material, the five acoustical and the four mechanical material parameters must be known. The direct measurement of these parameters is complex and requires cost-intensive measurement equipment. Current inverse methods to obtain these material parameters solve an optimization problem, trying to fit the absorption or impedance curve of the material model to the impedance tube measurement data. Solving this optimization problem, i.e. finding the global minimum, is not guaranteed in an acceptable amount of time, as the optimization problem possesses a multitude of local minima. This work proposes an alternative, data driven approach using artificial neural networks to obtain the material parameters necessary for the characterization of open porous materials. The approach only requires the results of standard impedance tube measurements. The characterization of rigid- and elastic frame materials has been investigated. The datasets were generated using the rigid and elastic frame models for porous absorbers. The approach shows good results for impedance curves generated by the analytical models, the validation with real-world impedance tube measurement data is currently under investigation. Y1 - 2025 SN - 978-3-939296-23-2 U6 - https://doi.org/10.71568/dasdaga2025.142 SP - 847 EP - 850 CY - Berlin ER - TY - RPRT A1 - Rill, Georg T1 - Second-Order Dynamic Friction Model Goes Bi-Dimensional N2 - Dynamic friction models can handle not only slip-stick-slip transitions but also stick as long as the external load does not exceed the friction limit. The recently developed second-order dynamic friction model (FrD2) uses two internal states. It models standard friction characteristics by a smooth analytical function, which includes the Stribeck effect and also a viscous component. A horizontal shift of the regularized friction characteristics provides non-vanishing friction forces required to keep stick. Unlike the well-known LuGre model, the FrD2 model reproduces predefined friction characteristics very accurately and shows no drift under pulsating loads. This paper shows how to extend FrD2 to its bi-dimensional version FrD2bd. KW - Second-Order Dynamic Friction Model KW - Shifted Regularization KW - Bi-Dimensional Friction KW - Planar Oscillator KW - Sliding Pendulum Y1 - 2025 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-80791 CY - Regensburg ER - TY - RPRT A1 - Rill, Georg T1 - Second-Order Dynamic Friction Model (FrD2) in a Nutshell N2 - The well-known LuGre friction model generates dynamic friction forces. This force results from the approximation of the dynamics of a massless fictitious bristle. However, it has several drawbacks and fails to reproduce predefined friction characteristics. The second-order dynamic friction model (FrD2) avoids these drawbacks and accurately reproduces friction characteristics. The FrD2 model is based on a fictitious bristle whose mass automatically adapts to visco-elastic bristle properties. The FrD2 model describes friction characteristics using piecewise-defined analytical functions and applies shifted regularization, which allows for smooth handling of stick-slip transitions. FrD2 parameters can easily be derived from LuGre model parameters. KW - Second-Order Dynamic Friction Model KW - Shifted Regularization KW - Fictitious Bristle KW - FrD2 Model Parameter KW - LuGre to FrD2 Y1 - 2025 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-80770 ER - TY - GEN A1 - Schuderer, Matthias A1 - Rill, Georg A1 - Schulz, Carsten A1 - Schaeffer, Thomas T1 - Influence of fictitious bristle parameters in dynamic friction models T2 - Global Annual Meet on Mechanical and Aerospace Engineering (GAMMAE2025), March 10-12, 2025, Rome, Italy N2 - In this study, the influence of bristle parameters in dynamic friction models is investigated, in particular in the LuGre and FrD2 models. These models contain internal states to better capture the friction behavior. The FrD2 model, a second-order dynamic friction model, aims at higher accuracy. The investigation focuses on how the independent variation of the bristle stiffness and the damping parameters affects the model behavior, especially considering the practical approximations used in determining the damping coefficient. Y1 - 2025 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-80348 ER - TY - CHAP A1 - Maiwald, Frederik A1 - Fries, Fabian A1 - Schulze, Julian A1 - Honnerová, Petra A1 - Hierl, Stefan A1 - Schmidt, Michael T1 - Optical coherence tomography for in situ weld seam monitoring in absorber-free laser transmission welding T2 - Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXX, 25-31 January 2025, San Francisco, California, United States N2 - Optical and medical devices are frequently made of polymers and place high demands on precision, cleanliness, and reliability of the manufacturing processes used. Absorber-free laser transmission welding is well-suited for joining these devices: the energy input is contactless, no adhesives, additives, or absorbers are required, and the fiber lasers used enable precise weld seams. As the weld seam geometry is decisive for the joint strength and thus crucial for the quality of the product, the welding process is monitored in-situ using Optical Coherence Tomography (OCT). Subsequently, the weld seam geometry is identified automatically using the AI model "Segment Anything" (SAM), which performs semantic segmentation of the OCT data without requiring any training from the user. Welding tests using polyamide six indicate that the seam size is measured with an accuracy of a few hundredths of a millimeter, showing excellent agreement with microscopic images of microtome sections. Y1 - 2025 U6 - https://doi.org/10.1117/12.3040607 PB - SPIE ER - TY - JOUR A1 - Paschke, Lukas A1 - Foltan, Maik A1 - Wagner, Maria S. A1 - Lubnow, Matthias A1 - Gruber, Michael A1 - Krenkel, Lars A1 - Lehle, Karla T1 - Clinical Relevance of Platelet-Leukocyte Aggregates and Platelet P-Selectin Expression During Venovenous Extracorporeal Membrane Oxygenation JF - ASAIO Journal N2 - Thrombosis continues to be a significant complication during venovenous extracorporeal membrane oxygenation (V-V ECMO). Platelet activation markers might serve as indicators of inflammation and thrombogenesis. The aim was to identify these markers in ECMO patients. Blood from 10 ECMO patients (before, during, after ECMO) and 11 healthy volunteers were collected to determine platelet-neutrophil-aggregates (PNAs), platelet-monocyte-aggregates (PMAs), fibrinogen-binding, and P-selectin-expression on platelets by flow cytometry. Critical illness was associated with significantly elevated levels of PNAs and PMAs, increased P-selectin expression, reduced fibrinogen-binding, and restricted activation of platelets. Although PNAs and PMAs decreased significantly within 2 hours after the initiation of ECMO and remained at those levels, ECMO did not affect basal P-selectin expression and fibrinogen-binding. These results correlated with coagulation activation. Platelet markers before ECMO were not indicators for an imminent system exchange and end of therapy. In conclusion, platelet dysfunction during ECMO was mainly attributed to the critical illness. Extracorporeal membrane oxygenation support strengthened the restricted response of platelets to exogenous agonists (P-selectin). Furthermore, a decrease in PNAs/PMAs after ECMO started identified a reduced inflammatory response. There was no correlation of analyzed platelet parameters with the incidence of thrombotic complications. Y1 - 2025 U6 - https://doi.org/10.1097/MAT.0000000000002421 SN - 1058-2916 IS - April 03 PB - Wolters Kluwer ER - TY - CHAP A1 - Herrmann, David A1 - Schaeffer, Leon A1 - Merker, Lukas A1 - Zentner, Lena A1 - Böhm, Valter ED - Nguyen, Duc-Nam ED - Tran, Ngoc Dang Khoa ED - van Huynh, Tuan ED - Ono, Takahito ED - van Nguyen, Hieu ED - Pandey, Ashok Kumar T1 - An Approach to the Realization of Multistable Tensegrity Structures with Deformable Compressed Members T2 - Microactuators, Microsensors and Micromechanisms : MAMM 2024. N2 - Within this paper a novel tensegrity-mechanism is described. The mechanism is based on a tensegrity principle with multiple states of self-equilibrium. The tensegrity mechanism is built upon a mechanical compliant tensegrity structure, consisting of tensioned and compressed members. The existence of the different states of self-equilibrium depends on the parameters of deformable compressed members with continuous or discontinuous load-displacement characteristic. The working principle of the mechanism and the mechanical compliance is verified by theoretical investigations. Therefore, in the first step, the deformable compressed members are analyzed separately. With the help of the subsequent following form-finding procedure the equilibrium configurations of the mechanism and their static stability are analyzed in dependence of the mechanical parameters of the compressed and tensioned members. As a specific application case, the use of the mechanism as a variable stiffness device is discussed. Y1 - 2025 SN - 978-3-031-83356-4 U6 - https://doi.org/10.1007/978-3-031-83357-1_34 SP - 343 EP - 350 PB - Springer Nature CY - Cham ER - TY - JOUR A1 - Tezel, Tugce A1 - Schultheiss, Ulrich A1 - Hornberger, Helga A1 - Kovan, Volkan T1 - Operational wear behaviour of 3D-printed lightweight metal gears: EDS and oil analysis comparison JF - Materials Testing N2 - Additive manufacturing (AM) has come to the fore in recent years among manufacturing techniques. This technique, which has different advantages than traditional ones such as casting, forging and machining, is expected to be widely used in producing machine parts like gears in the coming years. Therefore, experimental data on AM parameters for lightweight metal gears are important for industrial production. In this study, a wear test was applied to AlSi10Mg and Ti6Al4V gears under operational conditions, and the wear behaviour of conventionally and additively manufactured gears was compared. The amount of abrasion elements was determined by analysing the oil in the gearbox. In addition, gear surfaces were analysed using scanning electron microscopy and an energy-dispersive spectrometer before and after wear. Thus, the wear behaviour of gears produced by conventional and AM under service conditions was demonstrated comparatively. KW - gear KW - wear KW - additive manufacturing KW - titanium KW - aluminium Y1 - 2024 U6 - https://doi.org/10.1515/mt-2023-0222 SN - 2195-8572 VL - 66 IS - 6 SP - 830 EP - 834 PB - de Gruyter ER - TY - JOUR A1 - Rusavy, Zdenek A1 - Cechova, Hana A1 - Dendorfer, Sebastian A1 - Kalis, Vladimir A1 - Ismail, Khaled M. T1 - Is the Finnish grip tight enough? A manometric study of two manual perineal protection techniques JF - Acta Obstetricia et Gynecologica Scandinavica Y1 - 2025 U6 - https://doi.org/10.1111/aogs.15033 VL - 104 IS - 2 SP - 423 EP - 425 PB - Wiley ER -