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Results in Materials 2025年 26卷

作者： Mesbah, M.B. Rashed, H.M.M.A. Department of Materials and Metallurgical Engineering Bangladesh University of Engineering and Technology Dhaka 1000 Bangladesh Pilot Plant and Process Development Centre Bangladesh Council of Scientific and Industrial Research Dhaka 1205 Bangladesh

The evolution of microstructure and tensile properties of a binary Mg-1Ca alloy with different tin additions (1, 2, and 4 wt%) was investigated under various conditions of temperatures and strain rates. Mg-1Ca, Mg-1Ca-1Sn, Mg-1Ca-2Sn, and Mg-1Ca-4Sn samples were cast and homogenized. The homogenized samples were rolled at 400 °C. Optical microstructures of both cast and rolled samples were taken for microstructural analysis. Scanning electron microscopy of four rolled samples was carried out to identify the phases present. Tensile test of rolled alloys was carried out at temperatures 300, 350, 400, and 450 °C, and at two different strain rates 5x 10⁻⁴ s⁻¹ and 1x 10⁻⁴ s⁻¹. It was found that tin addition increased dendrite formation in as-cast alloys and continuously reduced the grain sizes of rolled alloys. The addition of a small amount of Sn increased both strength and elongation to failure values. However, a higher amount of Sn addition lowered the properties to some extent due to the formation of excessive intermetallic particles. At lower temperatures, higher strength and lower elongation to failure values were found due to higher work hardening. Conversely, at elevated temperatures, strength values were reduced due to inevitable softening and greater grain growth. © 2025 The Authors

关键词： Intermetallic particles Magnesium alloys Microstructure Sn effect Tensile properties

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Evaluation of methods for 3D imaging and analysis of vascularisation in biopreparations

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Current Directions in Biomedical engineering 2022年第2期8卷 61-64页

作者： Zöller, Nora Franke, Lisa Claussen, Joelle Gerth, Stefan Rauh, Cornelia Radlanski, Ralf J. Hiller, Karl-Heinz Hildenbrand, Markus F. Wittenberg, Thomas Hufnagel, Eva Fraunhofer IIS Development Center X-Ray Technology Fürth Würzburg Germany TU Berlin Dept. Food Biotechnology and Food Process Engineering Germany Charité Universitätsmedizin Berlin Germany Fraunhofer IIS Friedrich-Alexander-Universität Erlangen-Nürnberg Germany

Motivation: Within the field of bio-implants one topic deals with the in-vitro production of 3D tissues from cell cultures. A major challenge in the cultivation of biopreparations is the imitation of the vascular system with its surrounding tissue. Additiv manufacturing of such vascularisation could be supported with an adequate template from high-resolution 3D radiographs. Goals: Evaluation of high-resolution 3D-imaging methods and 3D-analysis approaches to extract the vascularisation from tissue samples. Methods: To provide such template, vascular structure of small tissues samples (partially treated with contrast medium) were recorded and compared using high-resolution CT and MRI imaging modalities. Optimal measurement parameters were selected for the acquisition of very small vessels. Interactive and semi-automated segmentation of the vessel system were investigated and compared. Results: MRI scans yield a higher contrast than CT scans, but are much slower. Duration of interactive segmentation ranges between 1 to 12 hours. Runtime of the (semi) automatic method was between 5 and 20 minutes, not counting manual adjustment of the parameters. Correlation between manual and automatic segmentation yield Hausdorff distances of 0.024 (CT) and 0.74 (MRI) and Dice coefficients of 0.7 (CT) and 0.39 (MRI). Conclusion: Both imaging methods are appropriate for high-resolution vessel detection and segmentation, nevertheless, MRI with no contrast agent seems preferable if the imaging time can be reduced. © 2022 The Author(s), published by De Gruyter.

关键词： Bioimaging

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Correction: Ethanol-assisted mechanochemical asymmetric cross-dehydrogenative coupling reaction with recoverable chiral amine/NaCl for accessing chiral α-alkyl α-glycine derivatives

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Green Chemistry 2024年第11期26卷 6836-6837页

作者： Jingbo Yu Hong Chen Ziwen Zhang Yuxin Fang Tao Ying Weike Su National Engineering Research Center for Process Development of Active Pharmaceutical Ingredients Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals Zhejiang University of Technology Hangzhou P.R. China yjb@***

Correction for ‘Ethanol-assisted mechanochemical asymmetric cross-dehydrogenative coupling reaction with recoverable chiral amine/NaCl for accessing chiral α-alkyl α-glycine derivatives’ by Jingbo Yu et al. , Gree...

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A comprehensive study of agricultural waste maize husk as a potential reinforcement in maize fiber/glass fiber hybrid composites

SPE Polymers

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SPE Polymers 2025年第2期6卷

作者： Hasan, Md. Hasibul Islam, Saiful Sajib, Md. Shamim Mahbub Rahman, G. M. Shafiur Sabur, Md. Abdus Ahmed, Aninda Nafis Mamun, Muhammad Abdullah Al Department of Materials Science and Engineering University of Rajshahi Rajshahi Bangladesh Pilot Plant and Process Development Centre Bangladesh Council of Scientific and Industrial Research Dhaka Bangladesh

This study presents a detailed analysis of hybrid composites fabricated using the hand lay-up method with unsaturated polyester resin (UPR) reinforced by glass fiber (GF) and varying contents of maize fiber (MF). The performance of these hybrid composites were compared with neat UPR, GF-reinforced UPR, and MF-reinforced UPR composites. MF was chemically treated and finely chopped to improve the matrix-reinforcement adhesion. Physical, mechanical, thermal, and electrical properties were assessed. GF composites exhibited superior mechanical strength, which dropped by replacing GF with MF in M/GFC1. However, with increasing MF content in the hybrid system, enhanced tensile strength, flexural strength, and micro-hardness, while compressive and impact strength declined. MF-only composite appeared with highest micro-hardness among other composites. A center GF layer composite displayed higher micro-hardness compared to those with GF on opposite sides. The incorporation of MF made the composites lightweight and thermally insulating, though thermal stability and water resistance somewhat compromised. Fabrication defects, such as voids, fiber agglomeration, fiber pull out were identified through scanning electron microscopy and density measurement. The presence of voids in the composite led to a decrease in tensile properties and an increase in initial water absorption. Additionally, an unexpected rise in thermal diffusivity was observed in these cases. Highlights: Agricultural waste natural fiber as a potential alternative of synthetic fiber. development of hybrid layered composites with maize fiber and glass fiber. Glass fiber and chemically treated maize fiber enhanced the properties of composites. Incorporation of maize fiber in composites increased water absorption, balancing insulation with resistance. Finding the optimal fiber fraction and composite system for better performance. Mechanical tests show superior strength and durability. © 2025 The Author(s). SPE Polymer

关键词： glass fiber hybrid composite layered structure maize fiber

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A Study on Novel Low Temperature Soldering process using Vapor phase

A Study on Novel Low Temperature Soldering Process using Vap...

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Electronic Components and Technology Conference (ECTC)

作者： Youngja Kim Woojin Choi Seungyeop Oh Sinyeop Lee Sunwon Kang AVP Process Development Team Samsung Electronics Co. Ltd. Cheon-An Si South Korea Package Process Development Team Samsung Electronics Co. Ltd Asan Si South Korea Package Engineering Team Samsung Electronics Co. Ltd Asan Si South Korea Package Development Samsung Electronics Co. Ltd Asan Si South Korea

ISBN: (数字)9798350375985

ISBN: (纸本)9798350375992

The packaging is a core technology in various integrated semiconductor systems, and interconnection is the key element of the packaging in providing monolithic-like performance. As the process temperature is increasing owing to the RoHS policies on major materials, there is an increasing need to address issues about degradation on quality and performance. It is essential to develop low-temperature processes that can guarantee reliability and mass production quality by limiting overheating. In this paper, a new low temperature soldering process, which utilized energy generated during vapor condensation, has been demonstrated to control temperature without overheating in the semiconductor packaging processes. The vapor phase soldering(VPS) process can control temperature to around the boiling point by taking advantage of the energy generated during vapor condensation. Actual test of introducing VPS into um-mm pitch processes including surface mount technology(SMT), flip chip mount(FCM), and solder ball attach(SBA) were carried out. Interconnection quality including joint gap and IMC growth was confirmed to be equivalent level of that of conventional convection reflow process. The slip phenomenon, misalignment of the soldering target with bump pad, occurred during the test of SBA and FCM process. The slip phenomenon was analyzed to be occurred by various forces applied on soldering target during the phase change of the soldering process. Solutions including adding weight or airflow were introduced to solve the slip phenomenon. The proposed method was verified by additional experiment in FCM process resulting that yield has improved significantly from 5% to 100% by controlling gravity and resistance, and simulations for FCM and SBA process had conducted for defining the relationship between applied forces during the VPS process with or without additional force applied.

关键词： Resistance Mass production Liquids Limiting process control Surface mount technology Packaging

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Direct Sputtered Copper Seed Layer Formation on Low Dielectric Resin to Reduce Transmission Loss

Direct Sputtered Copper Seed Layer Formation on Low Dielectr...

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IEEE International Conference on 3D System Integration, 3DIC

作者： Akihiro Shimizu Kazuhiro Fukada Shinichi Endo Mitsuru Abe Akiko Matsui Technology & Engineering Department 1 Photon Process Division Ushio Inc. Hyogo Himeji Japan Research and Development Department Shibaura Machine Co Ltd. Research & Development Center Kanagawa Zama Japan Photon Process Division Photon Process GBU Ushio Inc.Osaka Osaka Japan Assembly Solution Business Unit Assembly Technology Division NTT Devices Cross Technologies Corporation Kanagawa Kawasaki Japan

ISBN: (数字)9798331516505

ISBN: (纸本)9798331516512

We developed a method to form a copper seed layer directly on resins with excellent dielectric properties using sputtering (referred to as the direct sputtering method). One of the key challenges to implementing 6G wireless communication systems that use millimeter waves is minimizing high-frequency transmission losses, as the transmission loss is affected by the dielectric (resin substrate) and the conductor (copper wiring) used to fabricate the transmission line. We compared our direct sputtering method for fabricating transmission circuits with the electroless copper plating method by evaluating the characteristics of their high-frequency transmission up to 100 GHz. Our direct sputtering method has several advantages over the electroless copper plating method, including a streamlined fabrication process for the transmission circuit. The direct sputtering method reduces the usage of chemicals and the high-frequency transmission loss in the transmission circuit. Thus, our direct sputtering method is beneficial to the fabrication of transmission circuits for 6G wireless communications.

关键词： Wireless communication 6G mobile communication Fabrication Dielectric losses Plating Propagation losses Copper Resins Millimeter wave communication Sputtering

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Influence of inspiratory resistors on tracheal pressure during ventilation with decelerating flow

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Intensive Care Medicine – Paediatric and Neonatal 2025年第1期3卷 1-10页

作者： Werder, David Stankovic, Nikola Zander, Mark Oliver Serfözö, Peter Erb, Thomas Otto Hammer, Jürg Schmid Daners, Marianne Institute for Dynamic Systems and Control Department of Mechanical and Process Engineering ETH Zurich Zurich Switzerland Department of Anesthesiology University Children’S Hospital Basel University of Basel Basel Switzerland Product Development Group Zurich Department of Mechanical and Process Engineering ETH Zurich Zurich Switzerland Emergency Department Lausanne University Hospital Lausanne Switzerland Department of Pulmonology and Critical Care University Children’S Hospital Basel University of Basel Basel Switzerland

Understanding driving pressure is of general interest in lung mechanics, especially in ventilated neonatal and pediatric patients. The aim of this study was to investigate the effects of endotracheal tube size (ETT) and bi-directional linear flow resistors mimicking different degrees of tube and airway obstruction on tracheal pressure (Ptr) during ventilation with decelerating flow. A mechanical lung simulator with unchanged respiratory mechanics like the mimicked compliance and resistance, three ETTs (inner diameters of 7.5 mm, 5.5 mm, and 3.5 mm), and four different linear flow resistors were alternatively connected to a commercial ventilator operating in pressure-controlled mode. Four resistors mimicking various degrees of ETT obstructions were placed consecutively between the Y-piece and the ETT. Varying sequentially ETT size, resistance, and ventilator settings resulted in 90 sets of measurements. Data acquisition, signal processing, and data analysis were performed using Python. The results clarify that decreasing ETT sizes and increasing flow resistances cause an increase in the time necessary to reach zero-flow conditions both during in- and expiration. This results in a decrease of Ptr at the end of inspiration and an increase of Ptr at the end of expiration, if inspiratory and expiratory times remain unchanged. The degree to which peak inspiratory pressure overestimates Ptr (or plateau pressure) in decelerating flow can be substantial and increases with increasing flow resistance. This highlights the importance of measuring plateau pressure or Ptr to understand pressure dynamics delivered to the lung.

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Ferro-floating memory:Dual-mode ferroelectric floating memory and its application to in-memory computing

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InfoMat 2022年第11期4卷 93-105页

作者： Sangyong Park Seyong Oh Dongyoung Lee Jin-Hong Park Department of Semiconductor and Display Engineering Sungkyunkwan UniversitySuwonRepublic of Korea Flash Process Architecture Team Flash Development TeamMemory BusinessSamsung Electronics CompanyPyeongtaekRepublic of Korea Department of Electrical and Computer Engineering Sungkyunkwan University(SKKU)SuwonRepublic of Korea SKKU Advanced Institute of Nanotechnology(SAINT) Sungkyunkwan UniversitySuwonRepublic of KoreagBeijingPeople's Republic of China

Various core memory devices have been proposed for utilization in future inmemory computing technology featuring high energy *** memory is considered as a viable choice owing to its high integration density,stability,and reliability,which has been verified by commercialized ***,its high operating voltage and slow operation speed issues caused by the tunneling mechanism make its adoption in in-memory computing applications *** this paper,we introduce a dual-mode memory device named“ferro-floating memory”,fabricated using van der Waals(vdW)materials(h-BN,MoS2,andα-In2Se3).The vdW material,α-In2Se3,acts as a polarization control layer for the ferroelectric memory operation and charge storage layer for the conventional flash memory *** to the tunnelingbased memory operation,the ferro-floating memory operates 1.9 and 3.3 times faster at 6.7 and 5.8 times lower operating voltages for programming and erasing operations,*** dual-mode operation improves the linearity of conductance change by 5 times and the dynamic range by 48%through achieving conductance variation ***,we assess the effects of the variation in device operating voltage on neural networks and suggest a memory array operating scheme for maximizing the networks'performance through various training/inference simulations.

关键词： artificial synaptic device dual-mode operation mechanism ferroelectric floating memory inmemory computing multi-stages conductance reconfigurable operation range

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Agro-Waste fromGladiolus hybridaPlants: Effects of Alkaline processing on a New Natural Cellulosic Fiber Derived for Polymer Composites

ACS Sustainable Resource Management

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ACS Sustainable Resource Management 2024年第10期1卷 2314-2326页

作者： Mohammad Abul Hasan Shibly Md. Hasin Arman Md. Abdus Sabur Mohammad Amir Hossain Bhuiyan Department of Environmental Sciences Jahangirnagar University Dhaka 1342 Bangladesh Department of Textile Engineering National Institute of Textile Engineering and Research Dhaka 1350 Bangladesh Department of Industrial & Production Engineering National Institute of Textile Engineering and Research Dhaka 1350 Bangladesh Pilot Plant and Process Development Centre Bangladesh Council of Scientific and Industrial Research Dhaka 1205 Bangladesh

This study investigates the potentiality ofGladiolus hybridaleaf fibers (GHLFs) as an eco-friendly reinforcing substance for polymer-based composites. Novel natural fibers were harvested fromGladiolus hybridaleaves (GHL) and treated with NaOH alkali (T-GHLF) to assess their influence on physical, strength, molecular, and heat-related properties. Initially, the obtained fibers had a diameter of 0.3084 mm, which reduced to 0.2524 mm following alkali treatment. Chemical investigation indicated that the cellulose content increased to 57.16 wt %, an enhancement of 11.38% over the untreated fibers, which had a cellulose content of 51.32 wt %. The degree of crystallinity percentage of the raw and processed fibers was 57.85% and 60.82%, respectively, without significant change in the cellulose phase. The thermogravimetric analysis indicated that T-GHLF exhibited improved thermal stability up to 257.77 °C, with the kinetic activation energy (Ea) measured at 81.56 kJ/mol. Fourier transform infrared spectroscopy (FTIR) has been employed to observe the distribution of different chemical groups on the fiber surface. Scanning electron microscopy (SEM) revealed that the fibers had a roughened surface. According to tensile testing of a single fiber, the Young’s modulus values for GHLFs and T-GHLFs were 2.08 and 2.21 GPa, respectively. These evidences suggested that GHLFs exhibited characteristics comparable to those of presently used natural fibers, positioning them as a strong contender to replace organic fibers in resin matrix composites. As a result, these novel natural resources may assist in achieving the Sustainable development Goals of the United Nations through the sustainable utilization of agricultural waste in polymer matrix composites.

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Applicability of control systems for predicting adjustments of body shop fixtures

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Procedia CIRP 2024年 126卷 1023-1028页

作者： Julian Schützenberger Claus-Dieter Reiniger Martin Manns PROTECH-Institute of Production Technology Mechanical Engineering Department University of Siegen Paul-Bonatz 9-11. 57076 Siegen Germany Process development body shop Mercedes-Benz AG Benzstraße 1 71059 Sindelfingen Germany

In automotive body-in-white production, geometry determining clamping technology is used. In order to counter deviations from the target geometries, fixtures are adjusted manually in an experience-based process that comprises iterative loops. Lately, AI based approaches have led to the question if they may reduce the time and material requirements of this process. This work provides an overview of literature that employs control methods for predicting adjustments of body shop fixtures. Applicability into automotive series production is evaluated and open requirements defined. Results show that there are multiple strategies that may help improve fixture adjustments in automotive industry.

关键词： body-in-white body shop quality management geometry dehisive control loop geometry deviation

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