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Temperature dependence Tendency of the Strength development of Ultra-Low-Shrinkage and High-Strength Zero-Cement Concrete 1

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International Symposium of the International Federation for Structural Concrete, fib Symposium 2023

作者： Matsuda, Taku Mine, ryuichiro Noguchi, Takafumi R&D Center Sumitomo Mitsui Construction Company Ltd. Chiba Japan Department of Architecture Graduate School of Engineering The University of Tokyo Tokyo Japan

ISBN: (数字)9783031325199

ISBN: (纸本)9783031325182

Low-heat, ultralow-shrinkage, and high strength zero-cement concrete referred to as Sustain Crete-Zero (STC-Zero) has been developed [1–5]. While containing no cement, its binder comprises powders generally used for concrete: ground granulated blast-furnace slag, fly ash, silica fume, and an expansive additive. Thanks to its low-heat, ultralow-shrinkage, and high strength characteristics, STC-Zero drastically reduces the risk of cracking and enhances the durability of concrete structures. In other words, STC-Zero is a promising new construction material capable of reducing not only CO2 emissions at early stages but also life cycle CO2 (LCCO2) including maintenance and renewal. This study focused on and experimentally examined the temperature dependence tendencies of the strength development of STC-Zero among its characteristics. To be specific, the strength of cores drilled from block specimens exposed outdoors and the indoor strength development under different temperature conditions were confirmed. As a result, it was found that (1) the strength gains of STC-Zero are greater at high temperatures and smaller at low temperatures than conventional concrete made using Portland cement;and (2) the strength development of STC-Zero cannot be uniformly evaluated by the generally adopted maturity factor based on equivalent age. The reason for this is discussed, focusing on the apparent activation energy at different equivalent ages. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Shrinkage

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Technology Architecture and Key Technologies of discrete Manufacturing digital Workshop 6

Technology Architecture and Key Technologies of Discrete Man...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Liu, Shuguang Zhang, Long Song, Tianle Yang, Chao School of Mechanical and Electrical Engineering Huangshan University Huangshan China Technology R&d Center Anhui Dorje Electric Co. Ltd Huangshan China

ISBN: (纸本)9798350346671

digital workshop technology is the representative application of digitization, automation and IoT technology in the Manufacturing workshop. It integrates the information of flexible manufacturing technology, process design system, intelligent identification technology, production organization system and other management systems, constitute an integrated manufacturing system with integrated information flow and automation. digital workshop is the core component of modern industry and the organic integration of information technology and intelligent manufacturing technology. This paper analyzed the characteristics of discrete manufacturing, and technology architecture of digital workshop, and information flow and data interaction of digital workshop are defined. The research provides a guidance and basis for the planning and construction of digital workshop for discrete manufacturing enterprises in China. © 2023 IEEE.

关键词： Information management

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Sliding Mode Observer-Based Position-Sensorless Control for Switched reluctance Motors with Actuator Faults 23

Sliding Mode Observer-Based Position-Sensorless Control for ...

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23rd International Conference on Control, Automation and Systems, ICCAS 2023

作者： Han, dong-Yoon Moon, Seungju Kim, Gyu-Won Youn, Huibeom Kim, Bo-Goon Ban, Jaepil School of Electronic Engineering Kumoh National Institute of Technology Gumi39177 Korea Republic of Nuc Electronics R&d Center Daegu41548 Korea Republic of

ISBN: (纸本)9788993215274

While rotor position estimation techniques have been extensively studied for position-sensorless control of switched reluctance motors (SrMs), the presence of actuator faults poses significant challenges in achieving accurate and reliable sensorless control performance. This paper proposes an actuator fault detection sliding mode observer (AFdSMO) for position-sensorless control of SrMs afflicted with failures in a motor drive. Specifically, we address the scenarios where a fault arise within the semiconductor switching devices of SrM drive, and we develop a dynamic model that describes an SrM control system with the fault. Then, we propose the AFdSMO that utilizes only phase current measurements to simultaneously estimate both the rotor position and faults. As a result, the proposed AFdSMO facilitates achieving position-sensorless control for SrMs in the presence of the actuator faults. Finally, simulation results illustrate the effectiveness of the proposed method in position-sensorless control compared to that of conventional strategies in the presence of actuator faults. © 2023 ICrOS.

关键词： robust control

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H∞ LPV Observer design for Position-Sensorless Control of Switched reluctance Motors: An LMI Approach 23

H∞ LPV Observer Design for Position-Sensorless Control of S...

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23rd International Conference on Control, Automation and Systems, ICCAS 2023

作者： Moon, Seungju Han, dongyoon Youn, Huibeom Kim, Gyuwon Kim, Bogoon Ban, Jaepil School of Electronics Engineering Kumoh National Institute of Technology Gumi39177 Korea Republic of R&d Center Nuc Electronics Daegu41548 Korea Republic of

ISBN: (纸本)9788993215274

Switched reluctance motors (SrMs) have gained significant attention in various industrial applications due to their high power density, simple structure, and low cost. For further cost reduction in the applications, it is essential to operate SrMs without position sensors. This paper proposes a design method of H-{infty} linear parameter varying (LPV) observer for position-sensorless control of SrMs. Specifically, we approximate a 6/4 SrM with a LPV system containing approximation errors. Then, an H-{infty} LPV observer is proposed to accurately estimate the rotor position in the presence of system model uncertainties and external disturbances. Finally, we propose a design method for the H-{infty} LPV observer in terms of linear matrix inequalities (LMIs). Simulation results are presented to demonstrate the effectiveness of the designed observer for position-sensorless control of the SrM. © 2023 ICrOS.

关键词： Linear matrix inequalities

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First-Passage Analysis of Electromagnetic Levitation System under Track Irregularity Excitation

First-Passage Analysis of Electromagnetic Levitation System ...

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2023 IEEE International Conference on Applied Superconductivity and Electromagnetic devices, ASEMd 2023

作者： Ni, Fei Shen, Boyang Xu, Junqi dai, Yawen Tongji University National Maglev Transportation Engineering R&d Center Shanghai201804 China Tongji University Institute of Rail Transit Shanghai201804 China

ISBN: (纸本)9798350301571

Considering the cumulative effect of track irregularity, it is necessary to make the electromagnetic levitation system not only have good running stability, but also to maintain high reliability and long-term good working condition. It is urgently needed to carry out random vibration analysis and structural reliability analysis of the system. In view of this, this paper sets up a theoretical framework based on the probability density evolution method to carry out the first-passage analysis of the levitation system on a high-speed maglev train. The probability density evolution information of the gap in the levitation system under the excitation of track irregularity is analyzed. The influence of track irregularity excitation on the first-passage time of the levitation system is further studied. © 2023 IEEE.

关键词： first-passage time levitation system Maglev train track irregularity

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Frequency-domain Thermal Coupling Model of Multi-chip Parallel Power Module

Frequency-domain Thermal Coupling Model of Multi-chip Parall...

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2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： Cai, Tianle Zhou, dangsheng Wang, Sufei Wu, Tianhao Ma, Ke Shanghai Jiaotong University Department of Electrical Engineering Shanghai China Shenzhen Hopewind Electric Co. Ltd. R&d Center Shenzhen China

ISBN: (纸本)9798350307832

In high-power applications, multi-chip parallel power modules have been widely used. When analyzing the thermal behavior of multi-chip parallel modules, the specific internal parallel structure and power loss characteristics under working condition should be taken into account. Existing thermal coupling models require individual chip heating for extracting thermal coupling parameters, which is not feasible in multi-chip parallel modules. Moreover, the requirement for extracting numerous parameters adds complexity to practical applications. In this paper, a novel thermal coupling model that combines multiple chips for modelling is proposed. This method analyses the power loss characteristics of power modules under operating condition and simplifies the input of the model. The model is applicable to multi-chip parallel power modules and has the advantage of requiring fewer parameters to be identified. This model has been validated by finite element simulation. © 2023 IEEE.

关键词： Finite element method

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Practical Numerical Modeling Approach for a design of a Two-dimensional Linear Synchronous Actuator 14

Practical Numerical Modeling Approach for a Design of a Two-...

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14th International Symposium on Linear drivers for Industry Applications, LdIA 2023

作者： Ito, Noriaki Koseki, Takafumi Ohnishi, Wataru Nakamura, Yuichiro Takahashi, Kenji Sekiguchi, Hiroyuki The University of Tokyo Dept. of Electrical Engineering and Information Systems Tokyo Japan Advanced Technology R&d Center Mitsubishi Electric Corporation Hyogo Japan

ISBN: (纸本)9798350329612

This paper proposes the design of a magnetically levitated planar motor, the configuration of a basic numerical method to embody the control concept, and the design procedure for an experimental test rig. This motor is stable in the levitating direction but unstable in the driving direction because it utilizes the repulsive force between the stator permanent magnets and the moving coils. One problem with magnetically levitated planar motors is the time-consuming nature of the three-dimensional finite element analysis. This analysis requires significant computational resources and can result in significant delays in the design process. To address this problem, a less time-consuming method using Gaussian process regression is presented. In addition, the proposed analysis is verified using a test rig equipped with several sensors. These sensors will provide measurements of static force characteristics and flux linkage to evaluate the performance and effectiveness of the motor under various operating conditions. © 2023 IEEE.

关键词： Finite element method

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WhaleOptNB: A Method for Automated Biomedical Text document Classification 7th

WhaleOptNB: A Method for Automated Biomedical Text Document ...

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7th International Conference on Intelligent Computing and Optimization, ICO 2023

作者： Kumar, S. Vishnu Chohan, Jasgurpreet Singh Kalita, Kanak Department of Electronics and Communication Engineering Vel Tech Rangarajan Dr Sagunthala R&D Institute of Science and Technology Avadi600062 India Department of Mechanical Engineering and University Centre for Research & Development Chandigarh University Mohali140413 India Department of Mechanical Engineering Vel Tech Rangarajan Dr Sagunthala R&D Institute of Science and Technology Avadi600062 India Jadara University Research Center Jadara University Irbid Jordan

ISBN: (纸本)9783031733239

In recent years, there has been a meteoric rise in the amount of digital information stored in the biomedical industry due to the rapid growth of the internet and other information technologies. Automated biomedical text classification has become an effective and robust method of accessing the increased amount of technical and medical literature in the biomedical sector through the classification of multiple source documents while preserving the significantly informative data to manage the enormous amount of biomedical data currently available. This is accomplished by automating the classification of multiple source documents in the biomedical field. Therefore, multi-document biomedical text classification plays an essential role in resolving the problem of gaining access to accurate and up-to-date information. A Whale Optimization Algorithm-based Weighted Naive Bayes Classifier (WhaleOptNB) for text document classification is proposed. A biomedical text document dataset is collected and preprocessed. Then, the preprocessed data's features are extracted using the Term Frequency-Inverse document Frequency (TF-IdF). To classify the biomedical text document, WhaleOptNB is utilized. To prove the efficiency of the proposed methodology, it is compared with existing methods. Simulation results show that the proposed method outperforms conventional methods. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Inverse problems

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Effects of hydrogen-rich water on antioxidant activity during barley malting

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Systems Microbiology and Biomanufacturing 2024年第3期4卷 1076-1085页

作者： Hao Zhu Chunqiong Shi Ying Xie Guolin Cai dianhui Wu Jian Lu Key Laboratory of Industrial Biotechnology School of BiotechnologyMinistry of EducationJiangnan UniversityWuxi 214122China National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing Jiangnan UniversityWuxi 214122China Jiangsu Provincial Engineering Research Center for Bioactive Product Processing Jiangnan UniversityWuxi 214122China Air Liquide(China)R&D Co.Ltd Shanghai 201100China

The influence of hydrogen-rich water(HrW)on the antioxidant activity and its inherent mechanism were investigated during barley *** antioxidant activity was evaluated with 2,2-diphenyl-1-picryhydrazyl(dPPH)radical scavenging activity,2,2’-azinobis-(3-ethylbenzthiazoline-6-sulphonate)(ABTS)radical cation scavenging activity,reducing power,and metal chelating *** results revealed that HrW(1.2 mg/L)significantly increased the antioxidant activity of malt,which was supported by the finding that HrW could effectively promote the synthesis of phenolic ***thermore,HrW treatment enhanced the activities of catalase(CAT),superoxide dismutase(SOd),and peroxidase(POd)and decreased the activity of polyphenol oxidase(PPO)in ***,our research demonstrated that HrW can be used to produce malt to increase its antioxidant activity effectively.

关键词： Hydrogen-rich water Antioxidant activity Barley Malt

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Field Measurement and retrieval research of Multi-physics Micro-measurement devices during the drilling Process in Oil and Gas Wells 30th

Field Measurement and Retrieval Research of Multi-physics Mi...

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30th International Conference on Computational and Experimental engineering and Sciences, ICCES 2024

作者： Li, Mu Wang, Hao Liao, Mao-Lin Yang, Yi CNPC Engineering Technology R&D Company Limited Beijing102206 China National Engineering Research Center of Oil and Gas Drilling and Completion Technology Beijing102206 China University of Science and Technology Beijing Beijing100083 China

ISBN: (纸本)9783031687747

While-drilling measurements are the primary means for oil and gas well engineers to obtain real-time downhole engineering parameters. Current single-point, dual-point, and intelligent drill-string multi-point measurement systems can achieve early detection of gas cut, leakage, and other conditions. However, these methods have drawbacks such as high usage costs and limited applicability. Micro-measurement devices based on Micro-Electromechanical Systems (MEMS) have emerged as a hot topic in recent years due to their ability to measure temperature, pressure, magnetic field, and dynamic parameters throughout the entire wellbore during mud circulation. These devices offer advantages such as small size, high measurement accuracy, fast data acquisition, cost-effectiveness, and strong applicability. In this study, bullet-shaped multi-physics micro-measurement device encapsulated with PdMS materials was developed and field retrieval tests were conducted. The functionality of parameter measurement under actual downhole circulation conditions was also tested. results showed that out of 14 micro-measurement devices deployed over a 30-min circulation and retrieval cycle, 6 were successfully retrieved, achieving a recovery efficiency of 42%. The retrieved micro-measurement devices successfully recorded angular velocity, acceleration, and temperature data during the circulation process. Finally, some issues encountered during field testing were identified and suggestions were proposed, which are of significant importance for the further development of this technology. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： drill strings

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