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23rd International Conference on Composite Materials, ICCM 2023

作者： Schelleis, Christoph Scheuring, Benedikt M. Hrymak, Andrew Henning, Frank Polymer Engineering Fraunhofer Institute for Chemical Technology Pfinztal Germany Institute of Vehicle Systems Technology Karlsruhe Institute of Technology Karlsruhe Germany Institute for Applied Materials Karlsruhe Institute of Technology Karlsruhe Germany Chemical and Biochemical Engineering Western University London Canada

Long fiber thermoplastic (LFT) materials can be compounded in an effective LFT direct (LFT-D) process. Polycarbonate (PC) is used in various applications for example in and around battery enclosures for electro mobility. Reinforced with glass fibers (GF), PC exhibits solid mechanical properties and is a promising and novel addition to the material portfolio of the LFT-D process considering current industry demands. Combining continuous (Co) and discontinuous (DiCo) fiber reinforced polymers (FRP) according to their respective strengths enables unique design freedom to this class of materials. LFT-D materials can be used as the DiCo phase. The semi-finished material of the LFT-D process, called plastificate, is placed in the charge area and will fill the mold during compression molding forming the flow area. These areas are very distinct in their microstructure. In this work, PC GF LFT-D is produced at various process parameter sets and molded into plates. Screw speed and fiber roving amount is varied. Plates were characterized for their fiber mass fraction, fiber length and tensile properties. Fiber mass fraction as well as fiber length are very homogenous over charge and flow area. Tensile properties are characterized in the flow area in eight adjacent positions. A strong influence of sample position on modulus and strength, resulting in deviations of up to twenty-five percent from highest to lowest value, is present. Running the extruder at increasing screw speeds improves Young's modulus as well as tensile strength. © 2023 International Committee on Composite Materials. All rights reserved.

关键词： Polycarbonates

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Integration of sensors during laser powder bed fusion: Design criteria for a solid connection of AM components with RFID tags

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PhotonicsViews 2024年第5期21卷 40-43页

作者： Schönherr, Andy Voigt, Sven Schob, Bernd Bucksch, Julia Ruiz Kroll, Lothar University of Technology Chemnitz Reichenhainer Str. 31/33 Chemnitz09107 Germany Fraunhofer Institute for Electronic Nano Systems Chemnitz Germany University of Technology Chemnitz Institute of Lightweight Structures and Polymer Technology Chemnitz Germany Capgemini Engineering Munich Germany

Laser powder bed fusion (PBF-LB/M) is an additive manufacturing (AM) process to produce high-strength, functionally integrated, lightweight metal components which cannot be built conventionally. This article addresses the expansion of functionality by integrating sensors within closed cavities. For this reason, the building process was stopped just before the cavities were closed. After positioning the sensors, the building process was continued and a solid connection to the AM component was established. © 2024 Wiley-VCH GmbH.

关键词： Powder metals

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Personalized Governance Strategy for Patient Data in a Digital One Health Surveillance System

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Procedia Computer Science 2025年 254卷 20-29页

作者： Edoghogho Olaye Imonikosaye Omafovbe Williams O. Aigbe Daniel Obuh Department of Computer Engineering Faculty of Engineering University of Benin Edo State Nigeria Fraunhofer-Institute for Electronic Nano Systems (ENAS) Chemnitz Germany.

The integration of personal devices in health surveillance has introduced significant patient data risks. In this research, we developed a Patients’ Personal Data Sovereignty System (PPDSS) to intelligently mask the patient's personal and sensitive data that should not be part of the data for analysis, ensuring these sensitive records do not find its way into machine learning models or to the Local Storage of the Capture Device. The approach presented in this paper is to ensure a high level of privacy and confidentiality for patients’ private health information (such as name, address, age and phone number) from the process of data collection, transmission, and storage to data analysis. The PPDSS is an android application built using new Flutter-based Cross Platform Technology which allows us to target other devices in future with same code base is designed to handle the data masking and elimination of Personal Identifiable Patients Data captured using the device camera before sending to the Machine Learning Models as texts. Records were captured from paper records using the camera on a smartphone installed with PPDSS. The image captured by PPDSS was obfuscated and then converted to text using AI-powered optical character recognition (OCR). The result is a personalized governance strategy of patient data, which ensures personal data privacy, confidentiality, and ethical use while maximizing the benefits of data-driven insights. The paper contributes to data governance by proposing a way of solving the problems at the point of data collection, rather than after the data have been collected.

关键词： digital sovereignty data privacy machine learning data obfuscation digital health surveillance healthcare records

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Challenges and Research Needs in the Offer Phase of Special Purpose Machinery and Plant engineering - A Qualitative Study with Industry Experts

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IEEE engineering Management Review 2024年

作者： Wilke, D. Mansheim, J. Dumitrescu, R. Fraunhofer Institute for Mechatronic Systems Design IEM in Paderborn Germany Advanced Systems Engineering at the Heinz Nixdorf Institute University of Paderborn and is director of strategy Fraunhofer Institute for Mechatronic Systems Design IEM in Paderborn Germany

Customization is an important competitive factor that enables companies to serve their customers better and succeed in an increasingly demanding and diverse market world. Instead of producing mass products for a broad target group, products or services are designed and produced to meet customers' individual needs and preferences. However, this also confronts companies with the challenge of meeting the diversity of customer needs. The special purpose machinery and plant engineering industry, a major European and especially German industry, is the industry considered in this article. To analyze the challenges in more detail, the authors conduct an interview study with experts from this industry. The authors examine the challenges faced by the experts during the offer phase, when the first design of a customized machine is created, and the phase that determines the company's success. Relevant literature is discussed and gaps in research are identified. © 1973-2011 IEEE.

关键词： Competition

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Inductive Sintering Module for Improved Multi-Die Attach in the Field of Power Packaging 12

Inductive Sintering Module for Improved Multi-Die Attach in ...

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12th IEEE CPMT Symposium Japan, ICSJ 2023

作者： Hofmann, Christian Rochala, Patrick Kroll, Martin Panhale, Sushant Baum, Mario Kuhn, Harald Oi, Kiyoshi Sanada, Masaki Murayama, Kei Fraunhofer Institute for Electronic Nano Systems Enas Department System Packaging Chemnitz Germany Chemnitz University of Technology Professorship for Forming and Joining Chemnitz Germany Fraunhofer Institute for Electronic Nano Systems Enas Department Systems Engineering Chemnitz Germany Fraunhofer Institute for Electronic Nano Systems Enas Chemnitz Germany Shinko Electric Industries CO. LTD. Process Development Dept. Nagano Japan

This work presents a heating technology for multi-die attach based on inductive silver sintering. Thus, the heat for the sintering reaction is confined locally to the bond region, avoiding heating of the entire power ... 详细信息

ISBN: (纸本)9798350325157

关键词： Sintering

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On the relationship between particle melting degree and phase transformation of alumina and alumina-based solid solution powders during atmospheric plasma spraying

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Surface and Coatings Technology 2025年 510卷

作者： Grimm, Maximilian Conze, Susan Berger, Lutz-Michael Lampke, Thomas Materials and Surface Engineering Group Institute of Materials Science and Engineering Chemnitz University of Technology ChemnitzD-09107 Germany Fraunhofer Institute for Ceramic Technologies and Systems Fraunhofer IKTS DresdenD-01277 Germany

The polymorphism and the thermo-physical properties of alumina create significant challenges for deposition of thermally sprayed coatings. For a better understanding of the associated phenomena, in this study two feedstock powders (one commercial plain alumina powder and one experimental solid solution powder (initial composition 83.0 mol% Al2O3, 8.5 mol% Cr2O3 and 8.5 mol% TiO2) both consisting mainly of the corundum phase were deposited by atmospheric plasma spraying (APS) using three different spray parameter sets. For each parameter set, the plasma jet area was studied as well as the fluctuation using a high-speed camera. Particle temperature and velocity were measured using a particle diagnostic tool. In addition, powders were collected in flight to study the melting state of the particles to improve the understanding of the phase transformation. The results show that the particle melting state is closely related to the particle temperature and is significantly influenced by the electrical power and the particle velocity. The experimental Al2O3-based solid solution powder shows significantly improved melting behavior. Controlling the melting state of the particles in order to achieve a high amount of α-phase is more difficult for the plain Al2O3 powder than for the alumina-based solid solution powder. Under the conditions studied, for plain Al2O3, a deterioration of the particle melting state leads to a reduction in deposition efficiency without effect on the phase composition in the coating, while for the alumina-based solid solution, the phase composition can be influenced in favor of a higher α-phase content without affecting the deposition efficiency. © 2025 The Authors

关键词： Corundum

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Topology optimization of nonlinear elastomer engine mounts considering the transfer behavior

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Forschung im Ingenieurwesen 2025年第1期89卷 1-10页

作者： Bahr, S. Jacobs, G. Höpfner, G. Hensel, E. Troge, J. Rapp, T. Institute for Machine Elements and Systems Engineering RWTH Aachen Aachen Germany Institute for Machine Tools and Forming Technology Fraunhofer Dresden Germany

Increasing global competition among electric vehicle manufacturers has elevated the Noise, Vibration, and Harshness (NVH) properties of drivetrains to a key quality feature. Unfavorable NVH properties occur when the drivetrain’s dynamic excitation forces excite modes of the sound-transmitting components at the respective eigenfrequencies. An established strategy to avoid this unwanted NVH behavior is topology optimization (TO), as it can shift unwanted modes of the drivetrain out of the excitation frequency range through geometrical adaptations using finite-element (FE) simulation. Another way to significantly influence unwanted NVH behavior in electric vehicle drivetrains are elastomer engine mounts which are employed to isolate the engine’s vibrations from the surrounding system and to dissipate vibrational energy. However, the effectiveness of these functionalities is limited in frequency ranges of local elastomer modes. Despite TO being well-established, challenges are given in shifting elastomer modes due to the complex material behavior. Firstly, the material’s softness results in an uncontrollably high density of local mount modes for TO, which presents a challenge in developing engine mounts without modes in the drivetrain’s excitation range, especially for electrified engines. Secondly, the elastomer’s nonlinear material impedes calculating the component’s modes with a linearized material approach. The goal of this contribution therefore is to develop a method that considers the complex material behavior of engine mounts in a TO process. To achieve this goal, the ideal transfer behavior of the engine mount, and consequently the positioning of mount modes within the frequency range, is determined based on the sound-transmitting structure and used as an objective for the optimization process. To consider the elastomer’s nonlinear transfer behavior during optimization, material parameters for each considered frequency are applied. The

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Realizing an all-glass beam splitter for space by using advanced joining technologies

Realizing an all-glass beam splitter for space by using adva...

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2022 International Conference on Space Optics, ICSO 2022

作者： Birckigt, P. Grabowski, K. Risse, S. Schlegel, R. Shestaeva, S. Schwinde, S. Schmidl, S. Klose, S. Rothhardt, Carolin Department Precision Optical Components and Systems Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Strasse 7 Jena07745 Germany

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Data Trading and Monetization: Challenges and Open Research Directions 7

Data Trading and Monetization: Challenges and Open Research ...

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7th International Conference on Future Networks and Distributed systems, ICFNDS 2023

作者： Ramadan, Qusai Boukhers, Zeyd Alshaikh, Muath Lange, Christoph Jurjens, Jan Institute Of Software Engineering University Of Koblenz Germany Fraunhofer Institute For Applied Information Technology Fit Germany Uniklinik Köln Germany College Of Computing And Informatics Saudi Electronic University Saudi Arabia Rwth Aachen University Germany University Of Koblenz Germany Fraunhofer-Institute For Software And Systems Engineering Isst Germany

ISBN: (纸本)9798400709036

Traditional data monetization approaches face challenges related to data protection and logistics. In response, digital data marketplaces have emerged as intermediaries simplifying data transactions. Despite the growing establishment and acceptance of digital data marketplaces, significant challenges hinder efficient data trading. As a result, few companies can derive tangible value from their data, leading to missed opportunities in understanding customers, pricing decisions, and fraud prevention. In this paper, we explore both technical and organizational challenges affecting data monetization. Moreover, we identify areas in need of further research, aiming to expand the boundaries of current knowledge by emphasizing where research is currently limited or lacking. © 2023 Owner/Author.

关键词： Electronic data interchange

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Combining multispectral UAV-borne and terrestrial point cloud data for time-saving forest inventory using Artificial Intelligence 3

Combining multispectral UAV-borne and terrestrial point clou...

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Multimodal Sensing and Artificial Intelligence: Technologies and Applications III 2023

作者： Kammel, Frederik Rathmann, Lars Schmitt, Annette Reiterer, Alexander Albert-Ludwigs-University Freiburg Department of Sustainable Systems Engineering - INATECH Freiburg Germany Fraunhofer Institute for Physical Measurement Techniques IPM Freiburg Germany

ISBN: (纸本)9781510664517

For both economic and research purposes, accurate information on forest composition, and the amount of dead wood is of paramount importance. It is not only important to know the biomass and the distribution of tree species but also to detect vermin and diseases to assess the health of a forest. Performing such inventory accurately with conventional methods of surveying (e.g., terrestrial laser scanners) is very labor and time-consuming as forests can be very dense, thus requiring many setups with a terrestrial laser scanner. We present an innovative approach for forest inventory combining UAV-borne light detection and ranging (LiDAR), multispectral aerial imagery, and terrestrial point cloud data measured with a handheld laser scanner. For such multi-sensor measurement campaigns, however, reliable extraction of forest parameters such as canopy height, the diameter at breast height (DBH), deadwood volumes, etc., strongly relies on the quality of sensor data fusion. Especially in dense forests, the GNSS signal, which is necessary for georeferencing the point clouds, can be very weak. However, terrestrial laser scans can capture much more information underneath the forest canopy which is partly obscured to the airborne data. To circumvent this mismatch, we propose an easily adaptable two-step workflow for fusing the directly georeferenced airborne LiDAR point clouds with the corresponding multi-spectral photogrammetric data and their unreferenced terrestrial counterparts. In the first step of the processing chain, individual terrestrial scans of the forest are coregistered using spherical laser targets located above exactly measured reference points. Secondly, these coarsely coregistered scans are then combined with the georeferenced airborne point clouds using control points. This is especially challenging as forests are very unstructured environments, and in addition, typical SLAM-features such as leaves, and branches tend to move. The result of this procedure are ra

关键词： Unmanned aerial vehicles (UAV)

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