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9th European Thermal sciences Conference, EUROTHERM 2024

作者： Sato, M. Takahara, Y. Matsumoto, M. Kajinami, N. Hanaoka, M. Iwakawa, M. Department of Mechanical Engineering and Science Graduate School of Engineering Kyoto University Kyoto615-8540 Japan Advanced Technology R&D Center Mitsubishi Electric Corporation Hyogo661-8661 Japan

Thermoelectric energy conversions have been attracting much attention, which directly generate electric energy from thermal one by utilizing the Seebeck effect. Among various efforts to improve the conversion efficiency, control of phonon propagation with nano-scale structures has been popular, which utilize phonon scatterings on structural interfaces. The concept is based on the difference of mean free path (MFP) between phonons and electrons (charge carriers). In typical cases with silicon-base devices, MFP of phonons is in an order of 100 nm while that of electrons is 1-10 nm. Thus structures of 10-100 nm size are expected to be effective for suppressing the phonon heat transfer without much reducing the electric transport, leading to conversion efficiency improvement. We have developed a numerical scheme to investigate phonon transport based on the Boltzmann transport equation (BTE) for time development of the phonon distribution function. To treat various shapes of nano-scale structures, we have newly introduced a VOF (volume of fluid) like scheme. In the presentation, we will show results of several test systems of nano-structured Si thin films, with evaluation of effective electric conductivity, to discuss how much nano-scale structures improve the conversion efficiency. © Published under licence by IOP Publishing Ltd.

关键词： Conversion efficiency

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Morphology and Alignment Transition of Hexabenzocoronene (HBC) Mesogen Films by Bar Coating: Effect of Coating Speed

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Langmuir 2024年第32期40卷 16846-16854页

作者： Yang, Hao-Chun Du, You-Sheng Lee, Jey-Jau Yeh, Chun-Hong Tseng, Mei-Chun Ho, Yi-Chi Kuo, Han-Wen Yoshida, Hiroyuki Fujii, Akihiko Ozaki, Masanori Tao, Yu-Tai Akutagawg, Tomoyuki Chen, Hsiu-Hui Department of Molecular Science and Engineering National Taipei University of Technology Taipei106 Taiwan National Synchrotron Radiation Research Center Hsinchu300 Taiwan Institute of Chemistry Academia Sinica Taipei115 Taiwan School of Engineering Building VII Kwansei Gakuin University Sanda662-8501 Japan Department of Electrical and Electronic Systems Engineering Osaka Institute of Technology Omiya Osaka535-8585 Japan Division of Electrical Electronic and Infocommunications Engineering Graduate School of Engineering Osaka University Osaka565-0871 Japan Graduate School of Engineering Tohoku University Sendai980-8577 Japan Tohoku University 2-1-1 Katahira Sendai980-8577 Japan

Films of the discotic liquid crystalline hexabenzocoronene (HBC) derivative, HBC-1,3,5-Ph-C12, were prepared on the quartz substrate by the bar-coating method. Depending on the coating speed, regularly spaced stripes or continuous films were observed. In the former case, columns of the HBC derivatives align more along the stripes, which are perpendicular to the coating direction, whereas in the latter case, columns of the HBC derivatives in the film align more along the coating direction. These distinctive structures are confirmed via polarized optical microscopy (POM), polarized UV-vis spectroscopy, and grazing incidence small-angle X-ray scattering measurements. © 2024 The Authors. Published by American Chemical Society

关键词： Coatings

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Microfluidic Device for Simple Diagnosis of Plant Growth Condition by Detecting miRNAs from Filtered Plant Extracts

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Plant Phenomics 2024年第2期6卷 364-376页

作者： Yaichi Kawakatsu Ryo Okada Mitsuo Hara Hiroki Tsutsui Naoki Yanagisawa Tetsuya Higashiyama Akihide Arima Yoshinobu Baba Ken-ichi Kurotani Michitaka Notaguchi Bioscience and Biotechnology Center Nagoya UniversityFuro-choChikusa-kuNagoya 464-8601Japan Graduate School of Bioagricultural Sciences Nagoya UniversityFuro-choChikusa-kuNagoya 464-8601Japan Department of Molecular and Macromolecular Chemistry Graduate School of EngineeringNagoya UniversityFuro-choChikusa-kuNagoyaAichi 464-8603Japan Graduate School of Science Nagoya UniversityFuro-choChikusa-kuNagoya 464-8601Japan Institute of Transformative Bio-Molecules Nagoya UniversityNagoya 464-8601Japan Department of Biological Sciences Graduate School of ScienceThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-0033Japan Institute of Nano-Life-Systems Institutes of Innovation for Future SocietyNagoya UniversityFuro-choChikusa-kuNagoya 464-8603Japan Department of Biomolecular Engineering Graduate School of EngineeringNagoya UniversityFuro-choChikusa-kuNagoya 464-8603Japan Institute of Quantum Life Science National Institutes for Quantum Science and Technology(QST)Anagawa 4-9-1Inage-kuChiba 263-8555Japan Department of Botany Graduate School of ScienceKyoto UniversityKitashirakawa Oiwake-choSakyo-kuKyoto 606-8502Japan

Plants are exposed to a variety of environmental stress,and starvation of inorganic phosphorus can be a major constraint in crop *** plants,in response to phosphate deficiency in soil,miR399,a type of microRNA(miRNA),is *** detecting miR399,the early diagnosis of phosphorus deficiency stress in plants can be ***,general miRNA detection methods require complicated experimental ***,simple and rapid miRNA detection methods are required for early plant nutritional diagnosis.

关键词： mirnas plant device simple growth from condition detecting diagnosis extracts

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Parameter Design of Model Predictive control for the Displacement control of an Axial Piston Pump 9

Parameter Design of Model Predictive Control for the Displac...

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9th International Conference on Fluid Power and Mechatronics, FPM 2023

作者： Yamada, Tsuyoshi Ito, Kazuhisa Inada, Ryo Shibaura Institute of Technology Graduate School of Engineering and Science Saitama Japan Shibaura Institute of Technology Department of Machinery and Control Systems Saitama Japan Hitachi Construction Machinery Co. Ltd. Advanced Development Center Tsuchiura Japan

ISBN: (纸本)9798350304947

The tilt angle control of variable displacement hydraulic pumps is susceptible to changes in dynamic characteristics that depend on operating points and load pressure, and hence high control performance is hard to achieve. In this study, a variable displacement pump without a mechanical feedback mechanism is focused on and its displacement control system is designed using a model predictive control (MPC) method that can consider various design constraints. In particular, the adaptive MPC is introduced for accepting dynamic characteristics change and load pressure. The results clarified that the difference due to the variations in the model order was negligible for the steady-state deviation and settling time;however, the overshoot variation and the average of absolute tracking error could be attenuated using a higher order model for load pressure changes. Furthermore, the settling time and tracking error were considerably reduced by increasing the prediction and control horizons properly. © 2023 IEEE.

关键词： Model predictive control

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Fault Diagnosis Based on the Updating Strategy of Interval-Valued Belief Structures

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Chinese Journal of Electronics 2025年第4期23卷 753-760页

作者： Xiaobin Xu Ping Liu Yanbo Sun Chenglin Wen Institute of Systems Science and Control Engineering School of Automation Hangzhou Dianzi University Hangzhou China Department of Control Science and Engineering School of Astronautics Harbin Institute of Technology Harbin China

This paper presents the dynamic method for fault diagnosis based on the updating of Interval-valued belief structures (IBSs). The classical Jeffrey's updating rule and the linear updating rule are extended to the framework of IBSs. Both of them are recursively used to generate global diagnosis evidence with the form of Interval basic belief assignment (IBBA) by updating the previous evidence with the incoming evidence. The diagnosis decision can be made by global diagnosis evidence. In the process of evidence updating, the similarity factors of evidence are used to determine switching between the extended Jeffrey's and linear updating rules, and to calculate the linear combination weights. The diagnosis examples of machine rotor show that the proposed method can provide more reliable and accurate results than the diagnosis methods based on Dempster-Shafer evidence theory.

关键词： Fault diagnosis Accuracy Evidence theory Rotors Switches Reliability theory Real-time systems

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Multi-channel quantum parameter estimation

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science China(Information sciences) 2022年第10期65卷 53-65页

作者： Liying BAO Bo QI Yabo WANG Daoyi DONG Rebing WU Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences University of Chinese Academy of Sciences School of Engineering and Information Technology University of New South Wales Department of Automation Tsinghua University

The aim of quantum metrology is to exploit quantum effects to improve the precision of parameter estimation beyond its classical limit. In this paper, we investigate the quantum parameter estimation problem with multiple channels. It is related but not limited to the following two important and practical quantum metrology problems:(i) Quantum enhanced metrology with control, whose aim is to improve the precision of quantum sensing by utilizing feedback or open-loop control;(ii) Practical quantum metrology where the underlying evolution of quantum probes may change from a unitary dynamics to an open system dynamics,owing to the inevitable decoherence during the quantum sensing operation. For various kinds of quantum multiple channels, the corresponding quantum channel Fisher information is derived. To demonstrate the results, some illustrative examples are given.

关键词： quantum metrology quantum parameter estimation multi-channel quantum Fisher information

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An Effective Voltage control Approach for Distribution systems with High Penetration of Renewable Energy Resources 24

An Effective Voltage Control Approach for Distribution Syste...

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24th International Middle East Power System Conference, MEPCON 2023

作者： Bedawy, Ahmed Sasaki, Yutaka Zoka, Yoshifumi Yorino, Naoto South Valley University Faculty of Engineering Department of Electrical Engineering Qena Egypt Hiroshima University Graduate School of Advanced Science and Engineering Higashi-Hiroshima Japan Kure College Kure Japan

ISBN: (纸本)9798350358469

Voltage control becomes a crucial challenge as the penetration of renewable energy sources (RESs) increases in distribution systems. The intermittent and variable nature of RESs like solar and wind power can lead to several voltage problems, which can have detrimental effects on the stability and reliability of the distribution networks. This paper introduces a promising cooperative voltage control (CVC) technique for distribution systems with renewable-based distributed generations (DGs). The objectives of the CVC technique are regulating the voltages within the standard limits, maximizing the DGs' power generation, and decreasing the number of control operations of the voltage control devices in the distribution systems. The proposed CVC consists of two control stages;the DG prosumers perform the first control stage, whereas the step voltage regulators manage the second stage. This paper describes only the first stage, the DG prosumers control stage, using a proposed target nodal voltage control (TNVC) approach. The TNVC approach aims to maximize the DG's powers and mitigate the overvoltage problem using the optimized nodal voltage as a control signal. Our approach includes a unique feature that effectively reduces control performance degradation caused by infrequent data exchange among agents. The simulation results confirm the control performance of the proposed TNVC approach in achieving the desired objectives. © 2023 IEEE.

关键词： Distributed power generation

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Target Voltage control Approach for Active Distribution System Based on PV Active and Reactive Powers Nodal Prices

Target Voltage Control Approach for Active Distribution Syst...

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2023 International Symposium on Devices, Circuits and systems, ISDCS 2023

作者： Bedawy, Ahmed Ryuta, Kubo Yorino, Naoto Zoka, Yoshifumi Sasaki, Yutaka Taoka, Satoshi Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima Japan Kure College Kure Japan Department of Electrical Engineering Faculty of Engineering South Valley University Qena Egypt

ISBN: (纸本)9798350315042

Distribution systems with renewable-based distributed energy resources often face several voltage problems, including voltage fluctuations and rise. These problems make it difficult for system operators to control voltage effectively. Therefore, operators of distribution systems should consider these issues in future grid planning. In this paper, a promise voltage control technique is developed, referred to as the target voltage control (TVC) approach. The objective of the TVC approach is to maximize the distributed energy resources powers, decrease the profit unfairness among the prosumers, and enhance the grid voltage quality by mitigating the voltage rise problems. The proposed approach is unique in its ability to significantly reduce the control performance degradation that results from infrequent data exchange among the controlled agents. Through simulated case studies of a 38-node distribution test feeder with several photovoltaic sources, it has been demonstrated that the proposed TVC approach can effectively achieve the desired objective with low-frequency communication data exchange. © 2023 IEEE.

关键词： Renewable energy resources

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Edge-Driven Industrial Computing Power Networks: Digital Twin-Empowered Service Provisioning by Hybrid Soft Actor-Critic

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IEEE Transactions on Vehicular Technology 2025年第5期74卷 8095-8109页

作者： Zhang, Long Song, Deng-Ao Zhang, Hongliang Tian, Ni Zhuang, Zirui Niyato, Dusit Han, Zhu Hebei University of Engineering School of Information and Electrical Engineering Handan056038 China Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Beijing100871 China Beijing University of Posts and Telecommunications State Key Laboratory of Networking and Switching Technology Beijing100876 China Nanyang Technological University College of Computing and Data Science 639798 Singapore University of Houston Department of Electrical and Computer Engineering HoustonTX77004 United States Kyung Hee University Department of Computer Science and Engineering Seoul446-701 Korea Republic of

With the proliferation of data-intensive industrial applications, the collaboration of computing powers among standalone edge servers is vital to provision such services for smart devices. In this paper, we propose an edge-driven industrial computing power network (CPN) by orchestrating the computing and network resources of edge servers through the centralized resource scheduling and decentralized task computing. However, efficient task offloading and collaborative processing is challenging, which requires higher degrees of network automation and intelligence. Therefore, we incorporate digital twins (DTs) into the edge-driven CPN architecture, where the DTs are created as the digital replicas to assist both the computation offloading and collaborative processing. A joint optimization problem of the computing power assignment, service association, task partition, and transmit power control is formulated for maximizing the system average weighted utility. Due to the temporal-spatial variability of tasks and the resulted dynamic environment, we transform the original problem as a Markov decision process aiming at maximizing the long-term average weighted utility. To efficiently handle the high-dimensional discrete-continuous action space, a hybrid soft actor-critic based deep reinforcement learning algorithm is developed for optimizing the joint design. Simulation results validate the superiority of our proposed algorithm over the benchmarks, showing the significant gains obtained by integrating DTs into the edge-driven CPN. © 1967-2012 IEEE.

关键词： Markov processes

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Finite-time robust performance improvement for non-linear systems in the presence of input non-linearity and external disturbance

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IET control Theory and Applications 2023年第6期17卷 672-682页

作者： Wang, Haoping Ghaffari, Valiollah Mobayen, Saleh Bartoszewicz, Andrzej Fekih, Afef Assawinchaichote, Wudhichai School of Automation Nanjing University of Science and Technology Nanjing China Department of Electrical Engineering Persian Gulf University Bushehr Iran Graduate School of Intelligent Data Science National Yunlin University of Science and Technology Yunlin Douliou Taiwan Institute of Automatic Control Lodz University of Technology Lodz Poland Department of Electrical and Computer Engineering University of Louisiana at Lafayette LafayetteLA United States Department of Electronic and Telecommunication Engineering Faculty of Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand

The main focus of this research is on improving the performance of dynamic systems with actuator non-linearities and time-varying disturbances. To this end, using the concept of finite-time stability, a novel observer is presented to estimate the disturbances in systems with input non-linearities. Then, introducing an innovative sliding manifold, a robust observer-based technique is derived to guarantee the finite-time stability of the sliding surface. Hence, the closed-loop system would be stable in the presence of hard non-linearities and time-varying disturbances. The performance of the proposed approach was assessed in using a simulation study of two numerical examples. The obtained results and comparison with a conventional method confirmed the benefits of the suggested approach. © 2022 The Authors. IET control Theory & Applications published by John Wiley & Sons Ltd on behalf of The Institution of engineering and Technology.

关键词： Closed loop systems

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