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robust Control for Suspension System of Maglev Train Considering Parametric Uncertainty and Unidirectional Input Constraint

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IEEE Transactions on Industry Applications 2025年

作者： Sun, Yougang Li, Fengxing Ji, Wen Xu, Zhao duan, Fuchuan Tongji University State Key Laboratory of High-speed Maglev Transportation Technology College of Transportation Shanghai201804 China Tongji University National Maglev Transportation Engineering R&D Center Shanghai201804 China Southwest Jiaotong University School of Electrical Engineering Sichuan Chengdu610031 China

In the face of EMS type maglev train suspension system being susceptible to interference, non-negativity and saturation of control input, this paper adopts an adaptive robust control algorithm. By transforming the disturbance lumped term and the unmatched term in the dynamic equation, a control law is designed to compensate for parameter uncertainty and ensure input unidirectionality. The proposed method is rigorously proven to be asymptotically stable without requiring system linearization. Three sets of experiments were conducted on Changsha medium and low-speed maglev test train. The results show that the proposed method can quickly and accurately track the specified suspension gap, reduce gap oscillation and input maximum value and is robust to external interference. © 1972-2012 IEEE.

关键词： robust control

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The Synergetic Effect of Lean Six Sigma and TrIZ on the Improvement of an Electronic Component 26th

The Synergetic Effect of Lean Six Sigma and TRIZ on the Impr...

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26th International Joint Conference on Industrial engineering and Operations Management, IJCIEOM 2021

作者： Araújo, Sónia Lopes, João Alves, Anabela C. Navas, Helena Department of Production and Systems Engineering School University of Minho Guimarães4800-058 Portugal Department of Production and Systems School of Engineering ALGORITMI R&D Center University of Minho Campus of Azurém Guimarães4800-058 Portugal Department of Mechanical and Industrial Engineering NOVA School of Science and Technology UNIDEMI R&D Center Universidade NOVA de Lisboa Caparica2829-516 Portugal

ISBN: (纸本)9783030785697

Continuous improvement is a constant concern of companies operating in strongly competitive markets. This means to be constantly unsatisfied with the company status-quo, searching for opportunities to improve. The goal is to increase business efficiency and effectiveness, providing value to the client. In a fast-paced compass industry with complex products, the combination of strategies that bring such value is preferred. To that, the authors proposed to combine synergistically Lean Six Sigma and TrIZ to improve an electronic component of an instrument system in a first-tier automotive industry. This component that had an insignificant cost (1MU maximum) had a high rejection rate provoking complaints and losses that reached a loss of 156 189 MU. This motivated the company to define a project and allocate resources to it. Thus, the project was allocated and developed in the context of an Industrial engineering and Management master dissertation by the first author of this paper under an action-research strategy. The main results were a decrease of 83% of defects per million opportunities and savings higher than 50 000 MU. © 2021, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Lean production

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A Guidance Method for a Small Unmanned Surface Vehicle Wireless Charging

A Guidance Method for a Small Unmanned Surface Vehicle Wirel...

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OCEANS

作者： Chia-Cheng Hsu Sheng-Wei Huang Ho-Yueh Huang Feng-Yeang Chung Chi-Min Liao Edward Chen Jenhwa Guo Department of Engineering Science and Ocean Engineering National Taiwan University Keelung City Taiwan Department of Systems Engineering and Naval Architecture National Taiwan Ocean University Keelung City Taiwan Ship and Ocean Technology Research Center National Taiwan University Keelung City Taiwan Ship and Ocean Industries R&D Center Keelung City Taiwan

ISBN: (数字)9798350362077

ISBN: (纸本)9798350362084

A small unmanned surface vehicle (USV) usually carries a limited battery, and the mission duration is also limited. Wireless charging at sea is a way to extend the duration of USV. This work extends the study of developing a vector field-based guidance method for collision avoidance in the ship simulator. When the USV is in a vector field where near the charging station, the ship follows the vector field for guiding to touch the wireless charging plate. This vector field consists of a straight-line vector field and four circular vector fields in four quadrants to form a heading command to steer the ship. The feasibility of this work is tested by implementing the vector field guidance method into a ship simulator. In this work, the simulation considered wind, wave, and current influences on ship motions and combined the vector field-based guidance method to show the feasibility of the guidance method for USV wireless charging.

关键词： Meters Sea surface Simulation Inductive charging Switches Charging stations Surface charging Vectors Marine vehicles Autonomous vehicles

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Effect of Size-Controlled Low-Melting-Point-Alloy Particle-Incorporated on the reliability of Transient Liquid Phase Epoxy Composite Conductive Adhesive

Effect of Size-Controlled Low-Melting-Point-Alloy Particle-I...

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Electronics Packaging technology Conference (EPTC)

作者： Chen Liang Mingkun Yang Zhiteng Wang Cheng Wan Shimeng Xu Xiaochen Xie Pengrong Lin Zhibo Qu Yong Wang Xiuchen Zhao Yongjun Huo Gang Zhang School of Materials Science and Engineering Beijing Institute of Technology Beijing China School of Integrated Circuit Tsinghua University Beijing China Package R&D Center Beijing Microelectronics Technology Institute Beijing China Yangtze River Delta Graduate School of Beijing Institute of Technology Jiaxing Zhejiang Province China

ISBN: (数字)9798331522001

ISBN: (纸本)9798331522018

The effect of size-controlled Low-Melting-Point-Alloy (LMPA) particles on the reliability of transient liquid phase epoxy conductive adhesive (TLP-ECA) is discussed. The effects of LMPA particles on resistivity and shear strength were evaluated by high temperature aging (120°C, 1000 h) and high temperature and humidity (85°C, 85%rH, 1000 h) tests. Compared with the traditional Ag-ECA, the resistance of TLP-ECA decreases after high temperature aging, and the shear strength decreases with time, but the overall reliability is better. SEM and TEM analysis revealed that LMPA particles formed a metallurgical bridge with Ag sheets during the curing process, which inhibited crack formation and extension, and increases the contact area with the substrate. This ultimately improves the mechanical integrity, resulting in better electrical, mechanical and thermal stability of TLP-ECA.

关键词： Liquids Humidity Conductivity Aging Stability analysis reliability Transient analysis Thermal stability Conductive adhesives Substrates

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A Load Balancing Method of New Energy Specialized Chip Based on Segments division Adjustment

A Load Balancing Method of New Energy Specialized Chip Based...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： dehong Liu Wei Xi Ming Hu Xiaohua Li Zexiang Cai Xuran Liang Technology R&D Center China Southern Power Grid Digital Power Grid Research Institute Co. Ltd. Guangzhou China School of Electric Power Engineering South China University of Technology Guangzhou China

Currently, there is a growing proportion of distributed new energy in the distribution network. Unlike in the past, the widespread integration of new energy sources brings forth a multi-timescale phenomenon in the electric tasks now. When the new energy specialized chip receives the tasks, the imbalance of load will be strengthened. Consequently, an approach for balancing load is proposed in the context of new energy, which is based on segments division adjustment. The first step involves establishing a resource demand matrix based on the classification and modeling of electric tasks characteristics. Subsequently, the duty cycle adjustment scheme and flattened adjustment scheme are proposed for different segments under the regular scenes. Ultimately, the characteristics of the electric tasks serve as the foundation for the development of a backward flattening processing model in the sudden scenes. The effectiveness of the proposed optimization strategy is demonstrated by the simulation result that it will reduce the imbalance of the resource demand curve in both regular and sudden scenes.

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Comparative Study of Catalytic Conversion of Glucose Over Γ-Alumina Supported Tungsten Oxide Catalysts with Controlling Acidity

SSRN

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SSrN 2024年

作者： Cho, Yunhye Tran, Linh Mai Park, Sung Joon Min, Hyung-Ki Park, Min Bum Innovation Center for Chemical Engineering Department of Energy and Chemical Engineering Incheon National University Incheon22012 Korea Republic of Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Lotte Chemical R&D Center Daejeon34110 Korea Republic of Hydrogen & C1 Gas Research Center Korea Research Institute of Chemical Technology Daejeon34114 Korea Republic of

For the advancement of sustainable energy systems, biomass holds the potential to become a primary energy source worldwide. Glucose is one of the most economical and abundant carbohydrates, which can be converted to more value-added chemical feedstock. Here, a series of tungsten oxide catalysts supported on γ-alumina with varying tungsten content were synthesized using the wet impregnation method, and applied on the glucose conversion. The physicochemical properties of the prepared catalysts were investigated through powder X-ray diffraction, N2 sorption, scanning electron microscopy, UV-diffuse reflectance spectroscopy, and raman spectroscopy. Pyridine-adsorption Ir analysis was conducted to elucidate the acidic properties of the catalysts. As the loaded tungsten content increased, the concentration of Brønsted acid sites increased while the Lewis acid sites exhibited a decreasing trend. By controlling the acid concentration by the tungsten content, it was possible to adjust the optimal glucose conversion and the product selectivity in this cascade chemical reaction. © 2024, The Authors. All rights reserved.

关键词： Glucose

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Correction: Protocols for degradation assessment and stability enhancement in perovskite solar cells (Chemical Communications (2025) 61 (6722-6738) dOI: 10.1039/d5CC01404B)

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Chemical Communications 2025年第42期61卷 7696-7696页

作者： Seok Joo Yang Sungwon Song Chaneui Park Jinhyeok Choi Eunho Lee Min Kim Department of Chemical Engineering Gyeongsang National University Jinju Republic of Korea Semiconductor R&D at Samsung Electronics Suwon Republic of Korea Department of Chemical and Biomolecular Engineering Seoul National University of Science and Technology Seoul Republic of Korea Department of Chemical Engineering Center for Innovative Chemical Processes Institute of Engineering University of Seoul Seoul Republic of Korea

The authors regret that Chaneui Park’s name was spelled incorrectly in the original article. The correct spelling is as presented here. The royal Society of Chemistry apologises for these errors and any consequent in...

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Gravitational Modulation of Filler distribution in Asymmetric Mixed Matrix Membrane: Achieving High Loading in Skin Layer

SSRN

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SSrN 2024年

作者： Li, Ziheng Guo, Yuehu Yu, Jingbang ruan, Xuehua Jiang, Xiaobin dai, Yan Li, Tiantian Li, Xiangcun Zheng, Wenji He, Gaohong Liaoning Key Laboratory of Chemical Additive Synthesis and Separation Panjin Institute of Industrial Technology Dalian University of Technology Liaoning Panjin124221 China State Key Laboratory of Fine Chemicals R&D Center of Membrane Science and Technology School of Chemical Engineering Ocean and Life Sciences Dalian University of Technology Liaoning Dalian116023 China

The fillers in asymmetric mixed matrix membranes (AMMMs) by phase inversion tend to distribute across the membrane, but less in the skin layer, resulting in limited enhancement of gas separation performance. In this work, an external gravity field is proposed to induce polystyrene-acrylate (PSA) modified hollow ZIF-8 nanospheres (PHZ) to settle and accumulate in the skin layer by the density difference between ZIF-8 and the polymer solution, then through phase inversion, the gravity induced AMMMs (GAMMMs) with improved ZIF-8 loading in skin layer is constructed. This is confirmed by the EdS analysis of the membrane cross-sections that more PHZ settle and accumulate in the skin layer, which enhances the filler loading by 330% in comparison to the AMMMs without gravity sedimentation. Together with the hollow cavity of PHZ, the gas permeation can be improved greatly. Meanwhile, the PHZ can also guarantee the favorable interfacial compatibility by the hydrogen bonding interaction between the carboxyl groups in PSA with the PES polymer matrix, which is demonstrated by the slightly elevated Tg of GAMMMs over the ZIF-8/PES membrane. Consequently, the PHZ/PES GAMMMs can achieve high gas permeation while keeping sufficient selectivity at high filler loading in the skin layer. The PHZ-8d/PES GAMMM shows H2 permeance of 29.11 GPU and H2/CH4 of 83.04, which are 142.85% and 5.99% higher than those of ZIF-8/PES AMMM without gravity sedimentation, and exceeding the corresponding 2008 robeson upper bound. This proposed GAMMM shows a great potential in the large-scale MMMs based gas separation. © 2024, The Authors. All rights reserved.

关键词： Hydrogen bonds

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A novel vanadium complex VO(p-dmada)inhibits neuroinflammation induced by lipopolysaccharide

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Chinese Chemical Letters 2023年第10期34卷 209-214页

作者： Zhijun He Xiaoqian Li Huajie Zhang Xin Liu Shuangxue Han Anwar Abdurahman Liming Shen Xiubo du Nan Li Xiaoda Yang Qiong Liu Shenzhen Key Laboratory of Marine Biotechnology and Ecology College of Life Sciences and OceanographyShenzhen UniversityShenzhen 518055China National R&D Center for Se-rich Agricultural Products Processing Hubei Engineering Research Center for Deep Processing of Green Se-rich Agricultural ProductsSchool of Modern Industry for Selenium Science and EngineeringWuhan Polytechnic UniversityWuhan 430023China Shenzhen Bay Laboratory Shenzhen 518055China State Key Laboratories of Natural and Biomimetic Drugs Department of Chemical BiologySchool of Pharmaceutical SciencesPeking University Health Science CenterBeijing 100191China Department of Pharmacy Shenzhen People’s Hospital(The Second Clinical Medical CollegeJinan UniversityThe First Affiliated HospitalSouthern University of Science and Technology)Shenzhen 518020China Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions Shenzhen 518055China

Uncontrolled microglial activation is decisively involved in the neuroinflammatory pathogenesis of brain diseases. Consequently, suppression of microglial overactivation appears to be a strategy for the prevention of nerve injury. In this paper, a novel vanadium complex, vanadyl N-(p-N,Ndimethylaminophenylcarbamoylmethyl)iminodiacetate(VO(p-dmada)), was synthesized from vanadyl sulfate and N,N-dimethyl-p-phenylenediamine, which was structurally characterized by Fourier transform infrared spectrum and ESI-MS analysis. The effect of VO(p-dmada) on neuroinflammation was investigated by using the models of lipopolysaccharide(LPS)-induced BV2 microglial cells and BALB/c *** data demonstrated that VO(p-dmada) significantly suppressed microglial activation by downregulating inflammatory mediators and associated proteins, and inactivating nuclear factor-κ B(NF-κ B) signaling pathway. VO(p-dmada) also upregulated peroxisome proliferator activated receptor gamma(PPArγ) by reducing transglutaminase 2 and heat shock protein 60 expression. Co-treatment with PPArγ antagonist GW9662 significantly impeded the inhibitory effect of VO(p-dmada) on LPS-induced *** cumulative findings demonstrated that VO(p-dmada) is a potential new drug for the treatment of neuroinflammation-related neurodegenerative diseases.

关键词： Vanadium Vanadyl N-(p-N,Ndimethylaminophenylcarbamoylmethyl)iminodiacetate (VO(p-dmada)) Neuroinflammation Microglia Proteomics Peroxisome proliferator activated receptor gamma(PPArγ)

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research on Network Application of Intelligent Campus Based on SdN technology

Research on Network Application of Intelligent Campus Based ...

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Image Processing and Computer Applications (ICIPCA), IEEE International Conference on

作者： Yunyi Mei Qi Shao Qingzhong Gao Tong Zhao Yanlong Zhang Lingzhi Jing Yang Yu CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China Kunlun Digital Technology Co. Ltd. Beijing China CNPC Great Wall Drilling Company Beijing China

There are some problems in traditional network architecture, such as traffic can not be real-time scheduling, business information can not be visualized, operation and maintenance is complex, and fault location efficiency is low. In order to meet the needs of “digital Petroleum” network infrastructure construction, a company introduced SdN technology into the campus office network, and carried out network optimization management and innovation practice, this paper puts forward a network transformation scheme based on SdN “The network follows the people”, through deploying SdN control server and adjusting the network equipment configuration, the office network can be expanded flexibly and maintained efficiently, to meet the needs of different types of application traffic classification management and intelligent precision scheduling, effectively improve the level of intelligent network management.

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