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21st International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2021

作者： Thompson, Adam Rodríguez-Sánchez, Ángela Senin, Nicola Eifler, Matthias Hering, Julian Leach, Richard Manufacturing Metrology Team Faculty of Engineering University of Nottingham United Kingdom Department of Engineering University of Perugia 06125 Italy Institute for Measurement and Sensor Technology Technische Universität Kaiserslautern Gottlieb-Daimler Str. Kaiserslautern67663 Germany Department of Physics Research Center OPTIMAS Technische Universität Kaiserslautern Erwin-Schrödinger-Str. 56 Kaiserslautern67663 Germany

ISBN: (纸本)9780995775190

X-ray computed tomography (XCT) has been shown to be capable of capturing surface topography information comparable to that acquired using established surface measurement systems. However, calibration of XCT for surface measurement has not yet been achieved. The factors that influence XCT measurement are numerous, and the ways in which these factors affect measurements are not always clear. However, the problem of understanding complex, numerous influence factors exists for other measurement technologies as well, with factors being difficult or impossible to quantify in many cases, often because they cannot be measured in isolation from other influence factors. In measurement of areal surface topography, a calibration framework based on understanding the metrological characteristics (MCs) of an instrument has been developed to address the uncertainty problem;recently attaining international acceptance with the publication of ISO 25178-600. This framework was developed to allow calibration without characterising all the influence factors individually. Instead of examining all possible factors within a measurement system, the framework examines a few standardised characteristics of the system (i.e. MCs), as an approximate means to understanding measurement uncertainty. While some individual influence factors are inevitably double-counted (in that some factors contribute to more than one MC), the MC framework can be used to provide calibration for complex systems, with the caveat that double counting leads to slight increases in the determined measurement uncertainties. In this work, we apply the ISO 25178-600 MC framework to an XCT measurement system, demonstrating a method of calibrating such a system for surface measurement. We present a material measure to be used for this purpose. Given the novelty of applying the MC framework to XCT measurement and the associated complexities, we also provide an assessment of the MC framework with respect to its suitability for c

关键词： Surface measurement

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Dynamic measurement of Strain and Shape on a Rotating Helicopter Rotor Blade: The measurement Challenge 28

Dynamic Measurement of Strain and Shape on a Rotating Helico...

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28th International Conference on Optical Fiber sensors, OFS 2023

作者： James, S.W. Kissinger, T. Weber, S. Mullaney, K. Chehura, E. Barrington, J.H. Pekmezci, H.H. Staines, S.E. Charrett, T.O.H. Lawson, N.J. Lone, M.M. Tatam, R.P. Engineering Photonics Cranfield University MK430AL United Kingdom The Institute of Process Measurement and Sensor Technology Technical University of Ilmenau Ilmenau98694 Germany Centre for Aeronautics Cranfield University BedfordshireMK430AL United Kingdom Airbus Helicopters UK Ltd. Oxfordshire KidlingtonOX51QZ United Kingdom Now with Airbus Helicopters Deutschland GmbH Industriestrasse 4 Donauwöprth86609 Germany Now with Arm-ECS Research Centre University of Southampton SouthamptonSO17 1BJ United Kingdom Now with School of Aerospace Mechanical and Mechatronic Engineering The University of Sydney NSW2006 Australia Now with Lilium GmBH Munich Germany

ISBN: (纸本)9781957171302

Fibre-optic strain and shape sensing instrumentation were deployed on rotor blades during a full-speed helicopter ground run. Data were streamed wirelessly from rotor hub-mounted sensor interrogators, providing insights into the blade dynamics excited by pilot inputs to the controls and changes in rotation frequency. This paper explores the challenges of this application and considers means for visualisation of the data. © Optica Publishing Group 2023, © 2023 The Author(s)

关键词： Turbomachine blades

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Tracking of Magnetic Micromotors in Confined Channels Through Scattering Tissue 15

Tracking of Magnetic Micromotors in Confined Channels Throug...

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15th IEEE International Conference on Nano/Molecular Medicine and engineering, NANOMED 2021

作者： Aziz, Azaam Karnaushenko, Dmitriy Koukourakis, Nektarios Czarske, Jurgen W. Schmidt, Oliver G. Medina-Sanchez, Mariana Institute For Integrative Nanosciences Leibniz Institute For Solid State And Materials Research Dresden01069 Germany Measurement And Sensor System Technique And Competence Center Biolas Tu Dresden School of Engineering Dresden01069 Germany School of Science Cluster of Excellence Physics of Life Tu Dresden Germany Faculty of Physics Dresden TU Germany Professorship of Material Systems For Nanoelectronics Chemnitz University of Technology Chemnitz09111 Germany

ISBN: (纸本)9781665458566

The field of small-scale microdevices is growing rapidly towards the development of tethered/untethered microsensors and therapeutic agents that can move through narrow vascular networks in living organisms to diagnose and treat for example vascular diseases. However, imaging and localization of such microdevices are challenging under scattering tissue due to the lack of high spatial and temporal resolution that compromises the penetration depth and therefore the application scenario. Here, we report the tracking of magnetically-driven rolling micromotors (20 μm in diameter) through scattering tissue (1.2 mm thickness) using reflective infrared (IR) imaging. This technique provides high spatiotemporal resolution for the tracking of micro-agents in a narrow vascular network. As a potential application, we suggest the use of such micro-agents as micro-viscosimeters, in which by analyzing their dynamics, one can extract some basic information on the surrounding fluid properties which might be related to certain health status. © 2021 IEEE.

关键词： Micromotors

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Scanning Acoustic Microscopy for Quantifying Two-phase Transfer in Operando Alkaline Water Electrolyzer

arXiv

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arXiv 2024年

作者： Dou, Zehua Rox, Hannes Ramos, Zyzi Baumann, Robert Ravishankar, Rachappa Czurratis, Peter Yang, Xuegeng Lasagni, Andrés Fabian Eckert, Kerstin Czarske, Juergen Weik, David Faculty of Electrical and Computer Engineering Laboratory of Measurement and Sensor System Technique Technische Universität Dresden Helmholtzstraße 18 Dresden01069 Germany Institute of Fluid Dynamics Helmholtz-Zentrum Dresden-Rossendorf Bautzner Landstraße 400 Dresden01328 Germany PVA TePla Analytical Systems GmbH Deutschordenstraße 38 Westhausen73463 Germany Institute of Manufacturing Science and Engineering Technische Universität Dresden George-Baehr-Straße 3c Dresden01069 Germany Fraunhofer Institute for Material and Beam Technology IWS Winterbergstraße 28 Dresden01277 Germany Institute of Process Engineering and Environmental Technology Technische Universität Dresden Helmholtzstraße 14 Dresden01069 Germany Hydrogen Lab School of Engineering Technische Universität Dresden Helmholtzstraße 14 Dresden01062 Germany Institute for Emerging Electronic Technologies Leibniz Institute for Solid State and Materials Research Dresden Helmholtzstraße 20 Dresden01069 Germany

Improved understandings of two-phase transport in electrochemical gas-evolving systems are increasingly demanded, while high-performance imaging techniques using simplified instrumentations are not readily available. This work presents volumetric scanning acoustic microscopy (SAM) imaging for quantifying the dynamics of gas bubbles and electrolyte in porous Nickel electrodes with different wettability and structures during alkaline water electrolysis (AWE). We realize high-resolution 3D imaging at 10's µm level using high frequency spherically focused ultrasound. The high resolution allowed us to clearly visualize the spatial distributions of produced bubbles in the porous electrodes over time. Moreover, we are able to quantify the residual gas volume in an electrode and its coverage due to bubble evolution, which dominate its transport overpotential. Taking these advantages, we elucidate the impacts of electrodes' wettability and structures on their electrolysis performance, on a regular laboratory base. The obtained knowledge provides us important optimization guidelines of AWE designs and operating schemes. Copyright © 2024, The Authors. All rights reserved.

关键词： Mass transfer

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Influence of different cooling strategies during hard turning of AISI 52100 - Part II: Characterization of the surface and near surface microstructure morphology 5

Influence of different cooling strategies during hard turnin...

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5th CIRP Conference on Surface Integrity, CSI 2020

作者： Ankener, Werner Uebel, Julian Basten, Stephan Smaga, Marek Kirsch, Benjamin Seewig, Jörg Aurich, Jan C. Beck, Tilmann Institute of Materials Science and Engineering TU Kaiserslautern Gottlieb-Daimler-Str. Kaiserslautern67663 Germany Institute for Measurement and Sensor Technology TU Kaiserslautern Gottlieb-Daimler-Str. Kaiserslautern67663 Germany Institute for Manufacturing Technology and Production Systems TU Kaiserslautern Gottlieb-Daimler-Str. Kaiserslautern67663 Germany

This two-part paper addresses the impact of seven different cooling conditions on the finishing process as well as the resulting surface and near-surface microstructure morphology of the rolling bearing steel AISI 52100 in martensitic heat treatment state. The applied cooling strategies are liquid nitrogen (LN2-) cooling, CO2-snow cooling at varied mass flows, sub-zero metalworking fluids (MWF) at varied supply temperatures, and dry machining. Part II of the paper concerns the changes in surface roughness, examined by an angle resolved scatter light sensor, micro hardness measurement, microstructure observations, residual stress and phase composition analyses in the near-surface area, caused by the turning process, that is characterized in Part I. The lowest cooling performance, i.e. dry machining, results in low compressive axial residual stresses and a high proportion of retained austenite at the near-surface area. High cooling performance strategies like CO2 cooling or sub-zero MWF show an opposite distribution of the mentioned parameters, wherein the coolants' lubrication effect is an important aspect. Microstructural differences resulting from the process parameters used in these investigations tend to be less significant. Thus, they do not allow reliable assignment of the microstructure to the cooling strategies used. However, different cooling conditions show an impact on residual stresses, phase distribution and surface topography of the workpieces to varying extents. © 2020 The Author(s).

关键词： Cooling

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Electrolyte spraying within H2 bubbles during water electrolysis

arXiv

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arXiv 2024年

作者： Bashkatov, Aleksandr Bürkle, Florian Demirkır, Çayan Ding, Wei Sanjay, Vatsal Babich, Alexander Yang, Xuegeng Mutschke, Gerd Czarske, Jürgen Lohse, Detlef Krug, Dominik Büttner, Lars Eckert, Kerstin Institute of Fluid Dynamics Helmholtz-Zentrum Dresden-Rossendorf Bautzner Landstrasse 400 Dresden01328 Germany Physics of Fluids Group Max Planck Center for Complex Fluid Dynamics MESA+ Institute J. M. Burgers Centre for Fluid Dynamics University of Twente P.O. Box 217 Enschede7500AE Netherlands Laboratory for Measurement and Sensor System Techniques Faculty of Electrical and Computer Engineering Technische Universität Dresden Helmholtzstr. 18 Dresden01069 Germany Max Planck Institute for Dynamics and Self-Organization Am Fassberg 17 Göttingen37077 Germany Institute of Process Engineering and Environmental Technology Technische Universität Dresden Dresden01062 Germany

Electrolytically generated gas bubbles can significantly hamper the overall electrolysis efficiency. Therefore it is crucial to understand their dynamics in order to optimise water electrolyzer systems. Here we demonstrate a distinct transport mechanism where coalescence with microbubbles drives electrolyte droplets, resulting from the fragmentation of the Worthington jet, into the gas phase during hydrogen evolution reaction, both in normal and microgravity environments. This indicates that the H2 bubble is not only composed of hydrogen gas and vapor but also includes electrolyte fractions. Reminiscent of bursting bubbles on a liquid-gas interface, this behavior results in a flow inside the bubble, which is further affected by Marangoni convection at the gas-electrolyte interface, highlighting interface mobility. In the case of electrode-attached bubbles, the sprayed droplets form electrolyte puddles at the bubble-electrode contact area, affecting the dynamics near the three-phase contact line and favoring bubble detachment from the electrode. The results of this work unravel important insights into the physicochemical aspects of electrolytic gas bubbles, integral for optimizing gas-evolving electrochemical systems. Besides, our findings are essential for studying the limits of jet formation and rupture relevant to acid mist formation in electrowinning, generation of sea spray aerosols, impact of droplets on liquid surfaces, etc. © 2024, CC BY.

关键词： Hydrogen evolution reaction

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Engineered Modular Neuronal Networks-on-Chip Represent Structure-Function Relationship

SSRN

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SSRN 2024年

作者： Habibey, Rouhollah Striebel, Johannes Latiftikhereshki, Roshanak Schmieder, Felix Nasiri, Rohollah Latifi, Shahrzad Universitäts-Augenklinik Bonn University of Bonn Dep. of Ophthalmology Ernst-Abbe-Straße 2 BonnD-53127 Germany CRTD - Center for Regenerative Therapies TU Dresden Dresden01307 Germany Dept. Neuroscience Italian Institute of Technology Genova Italy Department of Computer Engineering Faculty of Engineering Kermanshah Branch Azad University Kermanshah Iran Laboratory of Measurement and Sensor System Technique Faculty of Electrical and Computer Engineering TU Dresden Helmholtzstraße 18 Dresden01069 Germany Division of Nanobiotechnology Department of Protein Science Science for Life Laboratory KTH Royal Institute of Technology Solna Sweden AIMES Center for the Advancement of Integrated Medical and Engineering Sciences Department of Neuroscience Karolinska Institute Solna Sweden Department of Neurology David Geffen School of Medicine University of California Los Angeles Los AngelesCA United States Department of Neuroscience Rockefeller Neuroscience Institute West Virginia University MorgantownWV26506 United States

Brain function is substantially linked to the highly organized structure of neuronal networks. The structures of in vitro assembled neuronal circuits often vary between samples and change over time, making it challenging to reliably record network functional output and link it to network structure. Therefore, engineering neuronal structures with predefined geometry and reproducible functional features is essential to robustly model in vivo neuronal circuits. Here, we engineered thin microchannel devices to assemble 2D and 3D modular networks. The microchannel devices were coupled with a multi-electrode array (MEA) electrophysiology system to enable long-term electrophysiology recordings from microengineered circuits. Each network consisted of 64 modules connected to their adjacent modules by micron-sized channels. The microstructures physically confined neurons to the recording electrodes, which significantly improved the efficiency of electrophysiology readout. In addition, the microstructures maintained the modular network structure for weeks. Modular circuits within microfluidic devices showed consistent spatial patterns of activity over weeks, which was lacking in the randomly formed circuits. The number of physical connections per module was shown to influence the measured activity and functional connectivity parameters, which represents the impact of network structure on its functional output. We show that microengineered 3D modular networks with profound activity and higher number of functional connections recapitulate key functional features of developing cortex. Structurally and functionally stable 2D and 3D networks mimic the modular architecture of brain circuits and provide a robust and reproducible in vitro microphysiological system for basic and translational neuroscience research. © 2024, The Authors. All rights reserved.

关键词： Microfluidics

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Monitoring the evolution of dimensional accuracy and product properties in property-controlled forming processes

arXiv

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arXiv 2023年

作者： Stebner, Sophie Charlotte Martschin, Juri Arian, Bahman Dietrich, Stefan Feistle, Martin Hütter, Sebastian Lafarge, Rémi Laue, Robert Li, Xinyang Schulte, Christopher Spies, Daniel Thein, Ferdinand Wendler, Frank Wrobel, Malte Vasquez, Julian Rozo Dölz, Michael Münstermann, Sebastian Integrity of Materials and Structures RWTH Aachen University Aachen Germany Institute of Forming Technology and Lightweight Components Technische Universität Dortmund Dortmund Germany Paderborn University Paderborn Germany Institute for Applied Materials - Material Science KIT Karlsruhe Karlsruhe Germany Garching Germany Institute of Materials and Joining Technology Otto-von-Guericke Universität Magdeburg Germany Forming and Machining Processes Technische Universität Dresden Dresden Germany Institute for Machine Tools and Productions Processes Professorship Virtual Production Engineering Chemnitz University of Technology Chemnitz Germany RWTH Aachen University Aachen Germany Institute of Automatic Control RWTH Aachen University Aachen Germany Institute for Production Engineering and Forming Machines Technische Universität Darmstadt Darmstadt Germany Institut für Geometrie und Praktische Mathematik RWTH Aachen University Aachen Germany Professorship Measurement and Sensor Technology Chemnitz University of Technology Chemnitz Germany Karlsruhe Germany Dortmund Germany

As recent trends in manufacturing engineering disciplines show a clear development in the sustainable as well as economically efficient design of forming processes, monitoring techniques have been gaining in relevance. In terms of monitoring of product properties, most processes are currently open-loop controlled, entailing that the microstructure evolution, which determines the final product properties, is not considered. However, a closed-loop control that can adjust and manipulate the process actuators according to the required product properties of the component will lead to a considerable increase in efficiency of the processes regarding resources and will decrease postproduction of the component. For most forming processes, one set of component dimensions will result in a certain set of product properties. However, to successfully establish closed-loop property controls for the processes, a systematic understanding of the reciprocity of the dimensions after forming and final product properties must be established. This work investigates the evolution of dimensional accuracy as well as product properties for a series of forming processes that utilize different degrees of freedom for process control. Copyright © 2023, The Authors. All rights reserved.

关键词： Microstructure

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Quantization of Acoustic Modes in Dumbbell Nanoparticles

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Physical Review Letters 2022年第4期128卷 048003-048003页

作者： Zuyuan Wang Hojin Kim Maria Secchi Maurizio Montagna Eric M. Furst Bahram Djafari-Rouhani George Fytas Max Planck Institute for Polymer Research Ackermannweg 10 Mainz 55128 Germany Institute for Measurement and Automation Division of Sensor Technology and Measurement Systems Bundeswehr University Munich Werner Heisenberg Weg 39 85579 Neubiberg Germany Department of Chemical & Biomolecular Engineering Allan P. Colburn Laboratory University of Delaware Newark Delaware 19716 USA Department of Industrial Engineering University of Trento via Sommarive 9 I-38123 Trento Italy Dipartimento di Fisica Universitá di Trento via Sommarive 14 I-38123 Trento Italy Institut d’Électronique de Microélectronique et de Nanotechnologie (IEMN) UMRCNRS 8520 Department of Physics University of Lille Villeneuve d’Ascq 59655 France

The vibrational eigenmodes of dumbbell-shaped polystyrene nanoparticles are recorded by Brillouin light spectroscopy (BLS), and the full experimental spectra are calculated theoretically. Different from spheres with a degeneracy of (2l+1), with l being the angular momentum quantum number, the eigenmodes of dumbbells are either singly or doubly degenerate owing to their axial symmetry. The BLS spectrum reveals a new, low-frequency peak, which is attributed to the out-of-phase vibration of the two lobes of the dumbbell. The quantization of acoustic modes in these molecule-shaped dumbbell particles evolves from the primary colloidal spheres as the separation between the two lobes increases.

关键词： Light-matter interaction Scattering theory Soft colloids Brillouin scattering & spectroscopy Finite-element method Inelastic light scattering

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Growth of TlBa_2Ca_2Cu_3O_9 Epitaxial Thin Films by Two-Step Method in Argon

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Chinese Physics Letters 2019年第5期36卷 79-83页

作者： Jian Xing Li-Tian Wang Xiao-Xin Gao Xue-Lian Liang Kai-Yong He Ting Xue Sheng-Hui Zhao Jin-Li Zhang Ming He Xin-Jie Zhao Shao-Lin Yan Pei Wang Lu Ji College of Electronic Information and Optical Engineering Nankai UniversityTianjin 300350 Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350 Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Tianjin 300350 Beijing Institute of Radio Measurement Beijing 100854

TlBa_2 Ca_2 Cu_3 O_9(Tl-1223) films have promising applications due to their high critical temperature and strong magnetic flux pinning. Nevertheless, the preparation of pure phase Tl-1223 film is still a challenge. We successfully fabricate Tl-1223 thin films on LaAlO_3(001) substrates using dc magnetic sputtering and a post annealing two-step method in argon atmosphere. The crystallization temperature of Tl-1223 films in argon is reduced by 100℃ compared to that in oxygen. This greatly reduces the volatilization of Tl and improves the surface morphology of films. The lower annealing temperature can effectively improve the repeatability of the Tl-1223 film preparation. In addition, pure Tl-1223 phase can be obtained in a broad temperature zone,from 790℃ to 830℃. In our study, the films show homogenous and dense surface morphology using the presented method. The best critical temperature of Tl-1223 films is characterized to be 110 K, and the critical current J_c(77 K, 0 T) is up to 2.13 × 106 A/cm^2.

关键词： Ba Cu Ca

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