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Oxide-based Materials and Devices XIV 2023

作者： Ruan, Yating Matic, Stipo Salg, Patrick Walk, Dominik Zeinar, Lukas Komissinskiy, Philipp Jakoby, Rolf Alff, Lambert Advanced Thin Film Technology Institute of Materials Science Technische Universität Darmstadt Darmstadt Germany Microwave Engineering and Technology Technische Universität Darmstadt Darmstadt Germany

ISBN: (纸本)9781510659490

Here we present all-oxide thin film tunable capacitors (varactors) grown epitaxially on silicon substrates, using a SrTiO3 buffer layer. In the all-oxide varactors, a highly conducting oxide SrMoO3 bottom electrode is covered with a functional 100 nm BaxSr1-xTiO3 tunable dielectric layer. A combined Au/Pt layer is used as a top electrode. The microwave properties show a tunability of 2 at 10 V bias voltage and a high quality factor Q(0V) = 45 at 1 GHz. Further improvement of the electric performance of the all-oxide varactors is feasible by the optimization of the growth process of the oxide layers and extending the SrMoO3 thicknesses beyond the skin depth at frequencies relevant for the considered application. The all-oxide varactors on Si are suitable for the high performance agile devices with low tuning voltages and ultra-low power consumption. © 2023 SPIE.

关键词： Silicon

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Subjective evaluation regarding mixing ratio of bone-conducted to air-conducted speech for own-voice perception 24

Subjective evaluation regarding mixing ratio of bone-conduct...

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24th International Congress on Acoustics, ICA 2022

作者： Toya, Teruki Birkholz, Peter UNOKl, Masashi Japan Advanced Institute of Science and Technology Japan Technische Universitat Dresden Germany

To clarify human speech perception and production mechanisms, perceptual properties of speakers' own voices transmitted via bone conduction should be further understood. In our previous studies, transfer functions of ear-canal sound pressure and regio temporalis vibration relative to oral-cavity sound pressure were physically measured. The former and latter were assumed to represent perceptual properties of the outer-ear and middle/inner-ear part of bone-conducted (BC) speech transmission during voicing, respectively. This paper investigated the contribution of BC speech reaching the middle/inner ear to one's own voice perception, as well as that reaching the outer ear, by making two types of filtered speech signals based on the measured transfer functions. The mixing ratio of speech signals filtered by each transfer function (i.e., mimicked BC speech signals) relative to the original air-conducted (AC) speech signals were determined through subjective evaluations. It was found that two filtered speech signals were mixed at almost the same level, and a combination of two filtered speech signals were mixed at almost the same level as the AC speech. These findings suggest that the middle/inner-ear part of transmission contributes to BC speech perception at almost the same extent as the outer-ear part. © 2022 Proceedings of the International Congress on Acoustics. All rights reserved.

关键词： Speech communication

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Advances and challenges of methanol-tolerant oxygen reduction reaction electrocatalysts for the direct methanol fuel cell

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Journal of Energy Chemistry 2023年第2期77卷 499-513,I0013页

作者： Muhammad Aizaz Ud Din Muhammad Idrees Sidra Jamil Syed Irfan Ghazanfar Nazir Muhammad Ahmad Mudassir Muhammad Shahrukh Saleem Saima Batool Nanpu Cheng Rahman Saidur School of Materials and Energy Southwest UniversityChongqing 400715China Additive Manufacturing Institute College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060GuangdongChina Chongqing Key Lab for Advanced Materials and Clean Energies of Technologies School of Materials and EnergySouthwest UniversityChongqing 400715China School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808GuangdongChina Department of Nanotechnology and Advanced Materials Engineering Sejong UniversitySeoul 05006Republic of Korea Department of Chemistry Khawaja Fareed University of Engineering and Information TechnologyRahim Yar Khan 64200Pakistan Laboratory for High Performance Ceramics EmpaSwiss Federal Laboratories for Materials Science and Technology8600 DübendorfSwitzerland Institute for Advanced Study Shenzhen UniversityShenzhen 518060GuangdongChina Research Centre for Nano-Materials and Energy Technology School of Engineering and TechnologySunway UniversityBandar SunwayMalaysia Department of Engineering Lancaster UniversityLancasterUnited Kingdom

Methanol cross-over effects from the anode to the cathode are important parameters for reducing catalytic performance in direct methanol fuel cells.A promising candidate catalyst for the cathode in direct methanol fuel cells must have excellent activity toward oxygen reduction reaction and resistance to methanol oxidation *** review focuses on the methanol tolerant noble metal-based electrocatalysts,including platinum and palladium-based alloys,noble metal–carbon based composites,transition metal-based catalysts,carbon-based metal catalysts,and metal-free *** understanding of the correlation between the activity and the synthesis method,electrolyte environment and stability issues are *** the transition metal-based catalyst,their activity,stability and methanol tolerance in direct methanol fuel cells and comparisons with those of platinum are particularly ***,strategies to enhance the methanol tolerance and hinder the generation of mixed potential in direct methanol fuel cells are also *** review provides a perspective for future developments for the scientist in selecting suitable methanol tolerate catalyst for oxygen reduction reaction and designing high-performance practical direct methanol fuel cells.

关键词： Oxygen reducing reaction Methanol tolerant electrocatalyst Portable power sources Direct methanol Fuel cell

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Monitoring the morphology evolution of LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)during high-temperature solid state synthesis via in situ SEM

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Journal of Energy Chemistry 2022年第3期31卷 9-15,I0001页

作者： Liang Tang Xiaopeng Cheng Rui Wu Tianci Cao Junxia Lu Yuefei Zhang Ze Zhang Institute of Microstructure and Property of Advanced Materials Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Institute of Laser Engineering Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China School of Materials Science and Engineering Zhejiang UniversityHangzhou 310058ZhejiangChina

The particle morphology determined by the sintering process is the director factor affecting the electrochemical performance of Ni-rich NMC cathode *** prepare the ideal NMC particles,it is of great significance to understand the morphological changes during sintering *** this work,the morphology evolution of LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)(NMC811)synthesis at temperature ranging from 300–1080℃were observed by in situ *** uniform mixture of spherical Ni_(0.8)Mn_(0.1)Co_(0.1)(OH)_(2)precursor and lithium sources(LiOH)was employed by high temperature solid-state process inside the SEM,which enables us to observe morphology changes in real *** results show that synthetic reaction of LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)usually includes three processes:the raw materials’dehydration,oxidation,and combination,accompanied by a significant reduction in particle size,which is important reference to control the synthesis *** heating temperature rise,the morphology of mixture also changed from flake to ***,Ni nanoparticle formation is apparent at higher temperature~1000℃,suggesting a structural transformation from a layered to a rock-salt-like *** the in-situ observed changes in size and morphology,and with the premise of ensuring the morphology change from flakes to bricks,reducing the sintering temperature as much as possible to prevent excessive reduction in particle size and layered to a rock-salt structure transformation is recommended for prepare ideal NMC particles.

关键词： Lithium-ion battery NMC cathode In situ SEM High temperature imaging Particle morphology

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A Human-Robot Interaction Dual-Arm Robot System For Power Distribution Network

A Human-Robot Interaction Dual-Arm Robot System For Power Di...

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2023 China Automation Congress, CAC 2023

作者： He, Haiyang Li, Yanghong Chen, Jian Guo, Yajuan Bi, Xiaotian Dong, Erbao Institute of Advanced Technology University of Science and Technology of China Hefei China University of Science and Technology of China Department of Precision Machinery and Precision Instrumentation Hefei China State Grid Jiangsu Electric Power Co. Ltd. Research Institute State Grid Nanjing China

ISBN: (纸本)9798350303759

The current live-line maintenance robot in the power distribution network faces a significant challenge. The commonly used operational methods have their limitations. Teleoperation heavily relies on the operator's experience and manual intervention, which places a burden on the operator. Autonomous operation requires a high level of intelligence from the robot, which is currently insufficient to handle the complexities of the power grid environment. To address the challenge, this paper proposes a human-robot interaction (HRI) dual-arm robot system. This system includes a human-in-the-loop operational framework, where human operators handle tasks that are difficult to automate using HRI devices. The robot's autonomous operations are guided by a standard trajectory library constructed using Dynamic Movement Primitives (DMP). Several experiments were conducted to validate the feasibility of the proposed robot system. © 2023 IEEE.

关键词： Human robot interaction

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Deformable micro-supercapacitor fabricated via laser ablation patterning of Graphene/liquid metal

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npj Flexible Electronics 2024年第1期8卷 770-778页

作者： Keon-Woo Kim Seong Ju Park Su-Jeong Park Inae Kim Bomi Park Se Hyun Kim Unyong Jeong Jin Kon Kim Chanwoo Yang National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer Department of Chemical EngineeringPohang University of Science and Technology(POSTECH)PohangGyeongbuk 37763Republic of Korea Advanced Nano-Surface&Wearable Electronics Research Laboratory Heat and Surface Technology R&D DepartmentKorea Institute of Industrial TechnologyIncheon 21999Republic of Korea Division of Chemical Engineering Konkuk UniversitySeoul 05029Republic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)PohangGyeongbuk 37763Republic of Korea

Deformable andminiaturized energy storage devices are essential for powering soft ***,we fabricate deformablemicro supercapacitors(MSCs)based on eutectic gallium-indium liquidmetal(EGaIn)current collectors with integrated *** well-define interdigitated electrode patterning with controlled gap is successfully realized by using the laser ablation because of a strong laser absorption of graphene and *** judicious control of gap size between neighboring interdigitated electrodes and mass loading of graphene,we achieve a high areal capacitance(1336μF cm^(−2))with reliable rate *** addition,owing to the intrinsic liquid characteristics of EGaIn current collector,the areal capacitance of fabricated MSC retains 90% of original value evenafter repetitive foldingand20%stretching up to 1000 ***,we successfully integrate deformable MSC with a commercial light-emitting diode to demonstrate the feasibility ofMSC as a deformable power *** fabricated MSCs operate stably under various mechanical deformations,including stretching,folding,twisting,and wrinkling.

关键词： laser stretching liquid

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Analytical Model and Topology Optimization of Doubly-fed Induction Generator

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CES Transactions on Electrical Machines and Systems 2024年第2期8卷 162-169页

作者： Lu Sun Haoyu Kang Jin Wang Zequan Li Jianjun Liu Yiming Ma Libing Zhou the State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China IEEE Dongfang Electric Machinery Co. LtdDongfang Electric CorporationDeyangChina CSG PGC Energy Storage Research Institute Southern Power Grid Energy Storage Co.LtdGuangzhou 510630China

As the core component of energy conversion for large wind turbines,the output performance of doubly-fed induction generators (DFIGs) plays a decisive role in the power quality of wind *** realize the fast and accurate design optimization of DFIGs,this paper proposes a novel hybriddriven surrogate-assisted optimization *** firstly establishes an accurate subdomain model of DFIGs to analytically predict performance ***,taking the inexpensive analytical dataset produced by the subdomain model as the source domain and the expensive finite element analysis dataset as the target domain,a high-precision surrogate model is trained in a transfer learning way and used for the subsequent multi-objective optimization *** on this model,taking the total harmonic distortion of electromotive force,cogging torque,and iron loss as objectives,and the slot and inner/outer diameters as parameters for optimizing the topology,achieve a rapid and accurate electromagnetic design for ***,experiments are carried out on a 3MW DFIG to validate the effectiveness of the proposed method.

关键词： Doubly-fed induction generators Accurate subdomain model Surrogate-assisted Transfer learning

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A Simulation Platform for Assessing the Status of the Vibration Sensor Hanging the Grid 17th

A Simulation Platform for Assessing the Status of the Vibrat...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Lei, Yaowu Liu, Jing Hu, Haoliang Chen, Dezhi Zhou, Feng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China China Electric Power Research Institute Wuhan430074 China

ISBN: (纸本)9789819904501

Vibration will lead to power grid disconnection, equipment rupture and other problems, so the working status of the vibration sensor hanging the grid is closely related to the normal operation of the power grid. But there are few researches on the status evaluation of the vibration sensor. On this basis, this paper selects spring-mass-damping system to simulate the sensor, and the classical mechanics is used to deduce the differential equation of the sensor under the system. By the equation, the corresponding transfer function can be established and replaces the sensor to simulate the actual sensor’s work in Simulink, which can provide the sensor work data used for algorithm validation. In addition, the platform simulation interactive interface with the Simulink is established by the APP Designer. In the test section, wavelet is selected for the pre-analysis, and the test is further completed by the BP neural network and Support Vector Regres sion. The simulation platform built can simulate the common status faults of the vibration sensor, and evaluate the status in the platform to test the effectiveness of the status evaluation algorithm. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Simulation platform

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Preparation and Dielectric Properties of a Novel Fluorinated Polyimide Containing Bulky Lateral Groups

Preparation and Dielectric Properties of a Novel Fluorinated...

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International Conference on (ICEPT) Electronic Packaging technology

作者： Peng Chen Chunhui Qu Liang Shan Guoping Zhang Rong Sun Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen China Nano Science and Technology Institute University of Science and Technology of China Suzhou China

ISBN: (数字)9798350353808

ISBN: (纸本)9798350353815

Along with the advances in the three-dimensional stacking IC packaging technology, the electronic crosstalk, signal loss of the advanced electronic packaging redistribution layer (RDL) are becoming more and more serious, and it is urgent to develop high-performance packaging materials, especially RDL dielectric materials with low dielectric constant (Dk) and low dielectric loss (Df) under high frequency conditions. In this study, a novel diamine monomer named 6FpyDA was successfully synthesized via Suzuki coupling reaction, Michael addition reaction, and Dehydrogenation reaction. A series of polyimide films were fabricated through conventional two-step thermal imidization process. The influence of the content of 6FpyDA on the dielectric properties of PI was investigated. It was found that the dielectric constant and dielectric loss of the PI decreased gradually with the increase of the content of 6FpyDA. Under 10 GHz, the dielectric constant reaches as low as 2.38 and the dielectric loss is $5\times 10^{-4}$ , showing excellent low dielectric properties. The introduction of bulky asymmetric rigid side groups and trifluoromethyl groups in the molecular chain were supposed to be the reason, which make the PI molecular chain exhibits a lower polarizability and a larger free volume between the molecular chains. The mechanical properties and thermal stability of PI are gradually enhanced with the increase in 6FpyDA content, leading to a tensile strength of up to 130 MPa. This exceptional comprehensive performance demonstrates its significant potential in the field of microelectronics packaging. Consequently, this study offers valuable insights for the fabrication of low dielectric intrinsic polyimides.

关键词： Dielectric constant Films Dielectric losses Polyimides Packaging Electronic packaging thermal management Mechanical factors

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Complete and Terminating Tableau Calculus for Undirected Graph

arXiv

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arXiv 2024年

作者： Nishimura, Yuki Takagi, Tsubasa Tokyo Institute of Technology Tokyo Japan Japan Advanced Institute of Science and Technology Ishikawa Japan

Hybrid logic is a modal logic with additional operators specifying nominals and is highly expressive. For example, there is no formula corresponding to the irreflexivity of Kripke frames in basic modal logic, but there is in hybrid logic. Irreflexivity is significant in that irreflexive and symmetric Kripke frames can be regarded as undirected graphs reviewed from a graph theoretic point of view. Thus, the study of the hybrid logic with axioms corresponding to irreflexivity and symmetry can help to elucidate the logical properties of undirected graphs. In this paper, we formulate the tableau method of the hybrid logic for undirected graphs. Our main result is to show the completeness theorem and the termination property of the tableau method, which leads us to prove the decidability. © 2024, CC BY.

关键词： Undirected graphs

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