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arXiv 2022年

作者： Razavi, Atieh Rutsch, Matthias Wismath, Sonja Kupnik, Mario von Klitzing, Regine Rahimzadeh, Amin Soft Matter at Interfaces Institute for Condensed Matter Physics Technische Universität Darmstadt Hochschulstraße 8 Darmstadt64289 Germany Measurement and Sensor Technology Department of Electrical Engineering and Information Technology Technische Universität Darmstadt Merckstraße 25 Darmstadt64283 Germany

As a novel stimulus, we use high-frequency ultrasonic waves to provide the required energy for breaking hydrogen bonds between Poly(N-isopropylacrylamide) (PNIPAM) and water molecules while the solution temperature maintains below the volume phase transition temperature (VPTT=32 °C). Ultrasonic waves propagate through the solution and their energy will be absorbed due to the liquid viscosity. The absorbed energy partially leads to the generation of a streaming flow and the rest will be spent to break the hydrogen bonds. Therefore, the microgels collapse and become insoluble in water and agglomerate, resulting in solution turbidity. We use turbidity to quantify the ultrasound energy absorption and showed that the acousto-response of PNIPAM microgels is a temporal phenomenon that depends on the duration of the actuation. Increasing the solution concentration leads to a faster turbidity evolution. Furthermore, an increase in ultrasound frequency leads to an increase in the breakage of more hydrogen bonds within a certain time and thus faster turbidity evolution. This is due to the increase in ultrasound energy absorption by liquids at higher frequencies. © 2022, CC BY.

关键词： Hydrogen bonds

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Fully Degradable, Highly Sensitive Pressure sensor Based on Bipolar Electret for Biomechanical Signal Monitoring

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SSRN 2024年

作者： Ma, Xingchen Qin, Yi Zhou, Lian Hu, Qianqian Xiang, Xinhao von Seggern, Heinz Zhukov, Sergey Altmann, Alexander A. Kupnik, Mario Niu, Wenxin Zhang, Xiaoqing School of Physics Science and Engineering Tongji University Shanghai200092 China Shanghai Yangzhi Rehabilitation Hospital Shanghai Sunshine Rehabilitation Center School of Medicine Tongji University Shanghai201619 China Department of Materials and Earth Sciences Technische Universität Darmstadt Darmstadt64283 Germany Measurement and Sensor Technology Group Technische Universität Darmstadt Darmstadt64283 Germany Department of Rehabilitation Sciences School of Medicine Tongji University Shanghai200092 China

In view of the global ecosystem crisis resulting from the ubiquitous electronic waste (e- and plastic waste), the engineering of advanced electronic devices from sustainable materials is gaining considerable attention. Nevertheless, the development of advanced, maybe even degradable electronics with comparable or even improved functionality remains a great challenge. In this article a fabrication process for a fully degradable, highly sensitive pressure sensor based on electrets is proposed enabling the creation of a universal platform for monitoring various biomechanical signals. The high sensitivity of the proposed biomechanical electret-based sensor utilizes electrostatic induction of highly deformable cellular polylactic acid (PLA) films with a serrated ripple structure and an improved bipolar charge storage capability. This biodegradable pressure sensor possesses competitive mechanical signal detection performance, obtaining a high pressure sensitivity (10 V/kPa), robust working stability (~30,000 continuous cycles), short electromechanical response/recovery time (~17 ms), and satisfactory heat resistance up to 60 °C. By tailoring the thickness of the encapsulation layer, the functional lifetime of the biomechanical sensor in physiological environment can be controlled effectively, facilitating adaptability to various implantable application scenarios. Altogether, the present work not only proposes an effective fabrication process for high-performance pressure sensors, but also provides new insight into the design of sustainable electronics with controllable lifetime thereby minimizing their environmental footprint. The developed sensor promises great potential in monitoring multiple biomechanical signals inside and outside the human body (e.g., body movements and physiological activities) as well as an environment-friendly realization of green electronics. © 2024, The Authors. All rights reserved.

关键词： Physiological models

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Flexible Human-Machine Interface Touch Pad S Based on Double-Network Solid-State Ionic Conductive Elastomers

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SSRN 2024年

作者： Zhan, Wang Zhang, Qi Ye, Zhilu Yang, Zihao Wang, Yijing Zhang, Cuiling Zhang, Zeying Xue, Li Ma, Feng Wang, Zhiguang Peng, Niancai Jiang, Zhuangde Lyu, Yi Liu, Ming Zhang, Xiaohui State Key Laboratory for Manufacturing Systems Engineering The Key Laboratory of Biomedical Information Engineering of Ministry of Education Center for Mitochondrial Biology and Medicine School of Life Science and Technology International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology Xi'an Key Laboratory for Biomedical Testing and High-end Equipment Xi'an Jiaotong University Shannxi Xi’an710049 China National Local Joint Engineering Research Center for Precision Surgery & Regenerative Medicine Shaanxi Provincial Key Laboratory of Magnetic Medicine Department of Hepatobiliary Surgery The First Affiliated Hospital of Xi’an Jiaotong University No. 277 West Yanta Road Shaanxi Xi’an710061 China State Key Laboratory for Manufacturing Systems Engineering Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education Engineering Research Center of Spin Quantum Sensor Chips Universities of Shaanxi Province School of Electronic Science and Engineering Xi'an Jiaotong University Xi’an710049 China State Key Laboratory for Manufacturing Systems Engineering School of Instrument Science and Technology International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology Xi’an Key Laboratory for Biomedical Testing and High-end Equipment Xi’an Jiaotong University Xi’an710054 China State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology Xi’an Jiaotong University Shaanxi Xi’an710049 China

In the rapidly evolving fields of artificial intelligence and the Internet of Things (IoTs), traditional rigid touch pads fall short in fulfilling the flexibility demands of cutting-edge human-machine interface technologies. Recent trends have seen the adoption of soft gel-based ionic conductors in the development of touch pads to enhance flexibility. Yet, these gel-based systems are hampered by intrinsic limitations like dehydration and ion/organic reagent leakage. Here, we report a flexible touch pad, ingeniously combining a surface-capacitive system with solid-state ionic conductive elastomers. Combination of salt-in-polymer and double-network structure strategies effectively addresses the longstanding trade-off between mechanical robustness and ionic conductivity. This pad supports a range of applications, from singular "point" interactions (flexible touch buttons) to "line" applications (stepless sound control and page turning) and finally, "surface" functionalities (game control and handwriting recognition). This research contributes significant insights to the advancement of next-generation human interfaces and IoTs. © 2024, The Authors. All rights reserved.

关键词： Interface states

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Retrospective motion correction for Fast Spin Echo based on conditional GAN with entropy loss 4

Retrospective motion correction for Fast Spin Echo based on ...

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2021 4th International Conference on Advanced Algorithms and Control engineering, ICAACE 2021

作者： Chen, Yalei Li, Pingan Liu, Kewen Bao, Qingjia Li, Zhao Li, Xiaojun Information and Communication Engineering Wuhan University of Technology Wuhan Hubei430070 China Hubei Key Laboratory of Broadband Wireless Communication and Sensor Networks Wuhan University of Technology Wuhan430070 China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Center for Magnetic Resonance Wuhan Institute of Physics and Mathematics Innovation Academy for Precision Measurement Science and Technology Wuhan430071 China Department of Chemical and Biological Physics Weizmann Institute of Science Rehovot Israel

We proposed a new end-to-end motion correction method based on conditional generative adversarial network (GAN) and minimum entropy of MRI images for Fast Spin Echo (FSE) sequence. The network contains an encoder-decoder generator to generate the motion-corrected images and a PatchGAN discriminator to classify an image as either real (motion-free) or fake(motion-corrected). Moreover, the image's entropy is set as one loss item in the cGAN's loss as the entropy increases monotonically with the motion amplitude, indicating that entropy is a good criterion for motion. The results show that the proposed method can effectively reduce the artifacts and obtain high-quality motion-corrected images from the motion-affected images in both pre-clinical and clinical datasets. © Published under licence by IOP Publishing Ltd.

关键词： Generative adversarial networks

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

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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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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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Smart Multi-coil Inductive Power Tranmission with IoT Based Visulization

Smart Multi-coil Inductive Power Tranmission with IoT Based ...

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IEEE World Forum on Internet of Things (WF-IoT)

作者： Ghada Bouattour Zheng Hu Houda Ben Jmeaa Derbel Olfa Kanoun Chair for Measurement and Sensor Technology Technische Universität Chemnitz Chemnitz Germany Department of Electrical Engineering University of Sfax Sfax Tunisia

ISBN: (数字)9781728155036

ISBN: (纸本)9781728155043

Multi-coil inductive power transmission technology has been widely investigated due to their ability to charge devices in large transmission area. In this paper, an implementation of multi-coil inductive power transmission system has been presented. The proposed system is composed by 16 coils organized in 4 columns and 4 rows controlled by switches. A small size sending side circuit is used, which is composed of a singular AC oscillator, power amplifier, resonant compensation capacitor and a passive voltage. This circuit offers a small size electronic parts, simplicity during implementation and low cost. An IoT Android application offers to the user the possibility of tracking the device to be charged on top of multicoil sending inductive power transmission system. A Bluetooth module has been connected to the sending side circuit to establish the communication with the user smartphone. To show the electronic circuit voltages, an LTspice simulation using realistic components has been presented. The proposed multi-coil system with the developed Android App. has been experimentally implemented.

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Vision Experiments on Chroma-Related Preference for Color Quality of Lighting

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Journal of the Illuminating engineering Society 2024年第4期20卷

作者： Yoshi Ohno Jiaye Li Yuki Kawashima Semin Oh a Sensor Science Division Physical Measurement Laboratory National Institute of Standards and Technology Gaithersburg Maryland USA b Department of Informatics Graduate School of Science and Engineering Yamagata University Yonezawa Japan c Department of Psychology School of Arts and Sciences University of Pennsylvania Philadelphia Pennsylvania USA

ABSTRACTTwo vision experiments were conducted to quantify the chroma-related preference in color quality of lighting in a real room-size cubicle simulating interior lighting environment with spectrally tunable light sources. The first experiment used 9 different lights with increased or decreased chroma in nine levels in red-green directions. The second experiment used 11 different lights with increased or decreased chroma in three hue directions, for red, green, and yellow, controlled as independently as possible. About 20 subjects participated in these two experiments evaluating the appearance of various fruits and vegetables as well as skin tone under these test lights by numerous pair comparisons. The results of the first experiment showed that chroma increase in ΔC*ab≈ 4 to 8 from the reference light was most preferred for all target objects, and desaturated lights were disliked in all cases. The second experiment showed that chroma change in red is significantly important for the preference, green was second, and yellow had the least effect on preference. The results of the second experiment suggested that preference increases with increasing red chroma in light, and after a peak in preference (between ΔC*ab≈ 5 to 10), preference starts decreasing, which is consistent with findings from the first experiment. Neither the viewing targets nor the correlated color temperature (CCT) conditions were found to have significant impact on the subjects’ preference.

关键词： Color rendition color preference chroma perception vision experiment

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Design and investigation on flexible inductive power tranmission shields 8

Design and investigation on flexible inductive power tranmis...

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8th IMEKO TC19 Symposium on Environmental Instrumentation and measurements, EnvIMEKO 2019

作者： Bouattour, Ghada Bouhamed, Ayda Al-Hamry, Ammar Ramalingame, Rajarajan Derbel, Houda Ben Jmeaa Kanoun, Olfa Chair for Measurement and Sensor Technology Technische Universität Chemnitz Chemnitz Germany Department of Electrical Engineering National Engineering School of Sfax University of Sfax Sfax Tunisia

Inductive power transmission coils are more and more used to charge devices wirelessly. In many applications, robustness, small size and flexibility of the used coils are required. For that, a design of flexible coil associated to a flexible ferrite shield becomes a necessity in order to achieve an efficient power transfer. In this paper, a new material composition for the ferrite shield have been proposed. It guarantees a better flexibility and performance using a simple fabrication process. Therefore, an optimization of the ferrite shield concentrations and thicknesses are performed. The influence of different prepared ferrite shield on the coil self-inductance and quality factor are investigated. Results shows that a concentration of ferrite of about 85 wt. % present the highest efficiency in case of high thickness with a self-inductance of 20.5 µH while in low concentration the measured coil self-inductance is around 17.5 µH. © 2019 8th EnvImeko - IMEKO TC19 Symposium on Environmental Instrumentation and measurements. All rights reserved.

关键词： Inductive power transmission

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Mechanical properties of an adjustable weighing cell prototype 19

Mechanical properties of an adjustable weighing cell prototy...

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19th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2019

作者： Darnieder, Maximilian Pabst, Markus Fröhlich, Thomas Zentner, Lena Theska, René Department of Mechanical Engineering Technische Universität Ilmenau Institute for Design and Precision Engineering Precision Engineering Group Department of Mechanical Engineering Technische Universität Ilmenau Institute for Process Measurement and Sensor Technology Process Measurement Technology Group Germany Department of Mechanical Engineering Technische Universität Ilmenau Compliant Systems Group Germany

ISBN: (纸本)9780995775145

Weighing cells based on the principle of electromagnetic force compensation are highly sensitive force measuring devices. A compliant mechanism with thin flexure hinges constitutes the mechanical basis of the balance. The weighing cells are the core components of high-performance vacuum mass comparators, e.g. for the comparison of one kilogram mass standards. According to the mechanical models, the achievable sensitivity of the measurement device is only limited by the adjustment resolution. Without further measures, the vertical adjustment of small trim masses represents a trade-off between resolution and tilt sensitivity. The numerical test of the underlying adjustment concept by finite element models reveals that the objectives of a high sensitivity and a low tilt sensitivity can be achieved simultaneously by a meaningful combination of adjustment measures. This represents a promising concept for the further enhancement of vacuum mass comparators. The prototypes are planar weighing cell structures for a flexible choice of the manufacturing process. The planar mechanism facilitates the comparison between models and measurements. The weighing cells for a nominal mass of 300g are experimentally investigated. The measurement of tilt reactions is enabled by the use of a precision tilt table as base for the weighing cell. Properties like stiffness and tilt sensitivity are determined as a function of the adjustment parameters. This way the mechanical models are verified, and the property enhancement of the weighing cell is evaluated. © 2019 European Society for Precision engineering and Nanotechnology, Conference Proceedings - 19th International Conference and Exhibition, EUSPEN 2019. All rights reserved.

关键词： Cells

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