检索结果-内蒙古大学图书馆

IEEE Open Journal of Power Electronics 2025年 6卷 849-857页

作者： Ueda, Takumi Sano, Kenichiro Terazono, daisuke Nada, Kaho Institute of Science Tokyo Department of Electrical and Electronic Engineering Meguro Tokyo1528550 Japan Mitsubishi Electric Advanced Technology R&D Center Hyogo Amagasaki6618661 Japan

With the increase of inverter-based resources, the reduction in grid inertia has become an issue. To overcome this problem, various virtual inertia controls have been proposed. df/dt control is a candidate for practical application since it can be integrated into conventional current controlled inverters. However, df/dt control can make the system unstable under certain conditions. A common solution is to use a low-pass filter (LPF), but there is no clear answer to why df/dt control becomes unstable and the LPF can improve stability. As a result, there are no general design criteria of the LPF for various plants. This paper focuses on the stability of a current-controlled inverter with df/dt-type virtual inertia control. The authors analyze the dynamic characteristics of a synchronous generator and demonstrate the existence of a second-order delay between the frequency of the point of common coupling (PCC) voltage and the speed of the rotor. The result demonstrates an equivalence between this delay and LPF for stabilization in df/dt control. Then, this second-order delay is implemented in df/dt control as an LPF. The influence of this LPF for stability is analyzed by EMT simulations and Bode plot of the entire system. These results illustrate that the LPF is indispensable for df/dt control, and parameters corresponding to synchronous generators can be used as a design criterion of the LPF. © 2020 IEEE.

关键词： Stabilization

来源：评论

学校读者我要写书评

暂无评论

Experimental Verification of Circuit-Losses Analysis-Model of dC-Output Converter developed using Approximated Equations from Measurement data and datasheet data 14

Experimental Verification of Circuit-Losses Analysis-Model o...

引用

14th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2025

作者： Kondo, ryota Funaki, Tsuyoshi Mitsubishi Electric Corporation Advanced Technology R&d Center Hyogo Japan Osaka Univercity Division of Electric Electronics and Information Engineering Osaka Japan

ISBN: (纸本)9798331516116

This paper proposes a losses-analysis model of a dC-output converter based on the approximated equations from measurements and a datasheet. Target verification circuit consists of a dC-voltage source, a smooth capacitor, two half bridge legs, and a load inductor connected to the midpoints of the half bridge legs, which controls the continuous average dC current of the load inductor. The use of self-measured data, compared with the use of datasheet values, enables expanding the ranges of the considerable target parameters. Hence, lesser order approximated equations can deal with more target parameters with less calculation period than that in a conventional time domain simulation. In this study, calculation flow of losses from power devices losses and inductor losses to circuit losses was developed. Subsequently, a power losses model and inductor losses model were developed via the linear least square method. Finally, a 400 V experimental system was developed to verify the accuracy of the circuit losses at 16 specified operating conditions by varying three verification parameters, switching frequency, gate resistance, and inductance. The result shows that the losses calculated using the proposed model has good accuracy with an error of 1.9 % to 10.6 % to the measured result. © 2025 IEEE.

关键词： Bridge circuits

来源：评论

学校读者我要写书评

暂无评论

daily Unit Commitment Optimization under Uncertainty in Market Price of Electricity and reserve

引用

IEEJ Transactions on Power and Energy 2025年第4期145卷 369-377页

作者： Naito, Kento Takai, Shigemasa Kitamura, Shoichi Mori, Kazuyuki Advanced Technology R&D Center Mitsubishi Electric Corporation 8-1-1 Tsukaguchi-Honmachi Amagasaki661-8661 Japan Graduate School of Engineering Osaka University 2-1 Yamada-Oka Suita565-0871 Japan

discussions are underway to make the reserve market to a day-ahead market starting in 2026. When it is realized, power producers need to make three types of plans for the next day: a unit commitment, bids for electricity market, and bids for reserve market. In a free competition, power producer needs to make these plans ensuring a stable earning. In this study, we present a practical method to plan a risk-averse unit commitment along with bids for electricity market, and reserve market. The numerical results show that a proposed method improves CVar of a revenue from 1.40 to 5.14% within one hour of calculation time. © 2025 The Institute of Electrical Engineers of Japan.

关键词： Power markets

来源：评论

学校读者我要写书评

暂无评论

deep neural network-based tools for hotel marketing activities of online travel agents

引用

Multimedia Tools and Applications 2025年 1-24页

作者： Keles, Ali Keles, Ayturk Keles, Mustafa Berk Mutlu, Behçet Department of Computer Education and Instructional Technology Faculty of Education Agri Ibrahim Cecen University Agri04100 Turkey Machine Learning Engineer *** Istanbul Turkey Director of Technology R&D Center *** Istanbul Turkey Department of Computer Engineering Gebze Technical University Kocaeli Turkey

Vacationers always want to choose the hotel that best meets their needs and expectations. For this, they typically use online travel agents (OTAs). OTAs must analyze millions of images from thousands of hotels quickly and classify them accurately to best meet demands. This is a highly complex and challenging task. OTAs also have to choose a default image to represent best way each hotel in order to best market hotels to vacationers and encourage click behavior. This is another challenge to overcome. The biggest problem in classifying millions of images from different areas of hotels is that these areas often have similar objects and environments. For this reason, fewer categories have been used in deep learning (dL) studies conducted so far. In this study, two deep neural networks (dNN) have been developed to accomplish these challenging tasks. The first network is the "hotel image classification network" (HICNet), which classifies images of different areas of hotels into 11 categories. In a multi-class classification task that includes closely related categories such as bar, food, and lobby, the HICNet network achieved very good results, reaching an average of 79% precision, sensitivity, and F1-score. The second network is the "hotel default image network" (HdINet), which enables the determination of a default image for each hotel on the OTA page. HdINet can accurately identify the default image of hotels with an average of 92% precision, sensitivity, and F1-score. These networks have been integrated into the OTA system named *** and are currently in active use. © The Author(s) 2025.

关键词： Hotels

来源：评论

学校读者我要写书评

暂无评论

Cellulose Elementary Fibrils as deagglomerated Binder for High-Mass-Loading Lithium Battery Electrodes

引用

Nano-Micro Letters 2025年第5期17卷 281-296页

作者： Young-Kuk Hong Jung-Hui Kim Nag-Young Kim Kyeong-Seok Oh Hong-I Kim Seokhyeon ryu Yumi Ko Ji-Young Kim Kwon-Hyung Lee Sang-Young Lee Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei-RoSeodaemun-GuSeoul 03722Republic of Korea Advanced Analysis and Data Center Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Ulsan Advanced Energy Technology R&D Center Korea Institute of Energy Research(KIER)Ulsan 44776Republic of Korea Department of Battery Engineering Yonsei University50 Yonsei-RoSeodaemun-GuSeoul 03722Republic of Korea

Amidst the ever-growing interest in high-mass-loading Li battery electrodes,a persistent challenge has been the insufficient continuity of their ion/electron conduction ***,we propose cellulose elementary fibrils(CEFs)as a class of deagglomerated binder for high-mass-loading *** from natural wood,CEF represents the most fundamental unit of cellulose with nanoscale *** preparation of the CEFs involves the modulation of intermolecular hydrogen bonding by the treatment with a proton acceptor and a hydrotropic *** elementary deagglomeration of the cellulose fibers increases surface area and anionic charge density,thus promoting uniform dispersion with carbon conductive additives and suppressing interfacial side reactions at ***,a homogeneous redox reaction is achieved throughout the *** resulting CEF-based cathode(overlithiated layered oxide(OLO)is chosen as a benchmark electrode active material)exhibits a high areal-mass-loading(50 mg cm^(-2),equivalent to an areal capacity of 12.5 mAh cm^(-2))and a high specific energy density(445.4 Wh kg–1)of a cell,which far exceeds those of previously reported OLO *** study highlights the viability of the deagglomerated binder in enabling sustainable high-mass-loading electrodes that are difficult to achieve with conventional synthetic polymer binders.

关键词： Cellulose elementary fibrils deagglomeration Electrode binders Lithium batteries High-mass-loading

来源：评论

学校读者我要写书评

暂无评论

drive Stabilization of Multi-degree-of-Freedom Maglev Planar Motor Based on Closed Loop System Identification

Drive Stabilization of Multi-Degree-of-Freedom Maglev Planar...

引用

2025 IEEE International Conference on Mechatronics, ICM 2025

作者： Nakata, Keigo Ohnishi, Wataru Koseki, Takafumi 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)9798331533892

Magnetic levitation planar motor can move at high speed and with high accuracy, and prevent vibration and noise because of no friction. This technology leads to the application of a transport system that requires high-speed and high-precision movement. However, the design of appropriate control algorithms is essential to achieve stability and high-speed, high-precision control of the maglev planar motor. In this research, we stabilized a maglev planar motor on the basis of system identification. Initially, we designed a whole control system for the movement of the maglev planar motor. Furthermore, we conducted system identification and verified that the maglev planar motor works with the designed control system and evaluated its motion performance. Through experiments, it was confirmed that accurate motion control was possible. This research is expected to be a basis for improving control performance soon. © 2025 IEEE.

关键词： degrees of freedom (mechanics)

来源：评论

学校读者我要写书评

暂无评论

Automatic detection and classification of drill bit damage using deep learning and computer vision algorithms

引用

Natural Gas Industry B 2025年第2期12卷 195-206页

作者： Yang, Xiongwen Feng, Xiao Cheng, Chris Yu, Jiaqing Zhang, Qing Gao, Zilong Liu, Yang Chen, Bo CNPC Houston Technology Research Center Beijing 100028 China CNPC Engineering Technology R&D Company Limited Beijing 102206 China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing 102206 China DataNova Analytics Incorporated Houston 77084 TX United States

This study aims to eliminate the subjectivity and inconsistency inherent in the traditional International Association of drilling Contractors (IAdC) bit wear rating process, which heavily depends on the experience of drilling engineers and often leads to unreliable results. Leveraging advancements in computer vision and deep learning algorithms, this research proposes an automated detection and classification method for polycrystalline diamond compact (PdC) bit damage. YOLOv10 was employed to locate the PdC bit cutters, followed by two SqueezeNet models to perform wear rating and wear type classifications. A comprehensive dataset was created based on the IAdC dull bit evaluation standards. Additionally, this study discusses the necessity of data augmentation and finds that certain methods, such as cropping, splicing, and mixing, may reduce the accuracy of cutter detection. The experimental results demonstrate that the proposed method significantly enhances the accuracy of bit damage detection and classification while also providing substantial improvements in processing speed and computational efficiency, offering a valuable tool for optimizing drilling operations and reducing costs. © 2025 Sichuan Petroleum Administration

关键词： Artificial intelligence damage assessment data augmentation deep learning IAdC dull PdC bit

来源：评论

学校读者我要写书评

暂无评论

SelfA-inclinometer: A novel device for evaluating the accuracy of tilting rotary tables in five-axis machine tools

引用

Precision engineering 2025年 95卷 38-51页

作者： Takahashi, Naoyuki Watanabe, Tsukasa Tobita, Kazuteru R&D Center SANKYO SEISAKUSHO Co. 2290 Honjo Shizuoka Kikugawa439-0018 Japan 1-1-1 Umezono Ibaraki Tsukuba Japan Department of Mechanical Engineering Faculty of Science and Technology Shizuoka Institute of Science and Technology 2200-2 Toyosawa Shizuoka Fukuroi Japan

In this study, we developed a compact, high-precision angle measuring device called the "SelfA-inclinometer". The purpose of the SelfA-inclinometer is to enhance the performance of a tilting rotary table, a crucial component of five-axis machine tools responsible for positioning the tilt and rotation axes. This device measures the tilt angle of the working surface of the table, where a workpiece is mounted, as it rotates around the tilt axis. The measurements are highly accurate, providing indicators for improving design, machining, and assembly accuracy. The measuring device comprises a compact self-calibrating rotary encoder (the SelfA), a rotating device, and a precision level. It mounts directly onto the surface to be measured and can measure a wide 360° range with precision on the order of an arc-second (1 arc-second:″ being 1/3600th of a degree). Comparing it with a national standard angle calibration system as a higher-level device revealed a measurement accuracy of ±2 arc-sec or better. Simultaneous measurements were conducted to compare the results with those obtained from a conventional measuring device like a rotary encoder, assessing the validity and superiority of the measurement. © 2025

关键词： Machine tools

来源：评论

学校读者我要写书评

暂无评论

Unveiling the roles of initial phase constituents and phase metastability in hydrogen embrittlement of TrIP-assisted VCrCoFeNi medium-entropy alloys

引用

材料科学技术（英文版） 2025年第4期207卷 160-176页

作者： Sang Yoon Song dae Cheol Yang Han-Jin Kim Sang-In Lee Hyeon-Seok do Byeong-Joo Lee Alireza Zargaran Seok Su Sohn Department of Materials Science and Engineering Korea University 02841 SeoulRepublic of Korea Green Energy Materials Research Team Hyundai Motor Company Uiwang R&D Center 16082 UiwangRepublic of Korea Institue of Advanced Technology Development Hyundai Motor Group 13529 SeongnamRepublic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology 37673 PohangRepublic of Korea Graduate Institute of Ferrous & Energy Materials Technology Pohang University of Science and Technology37673 PohangRepublic of Korea

Medium-entropy alloys(MEAs)that exhibit transformation-induced plasticity(TrIP)from face-centered cubic(FCC)to body-centered cubic(BCC)are considered promising for liquid hydrogen environments due to their remarkable cryogenic ***,studies on hydrogen embrittlement(HE)in BCC-TrIP MEAs have not been conducted,although the TrIP effect and consequent BCC martensite usually deteri-orate HE *** these alloys,initial as-quenched martensite alters hydrogen diffusion and trap behavior,and deformation-induced martensitic transformation(dIMT)provides preferred crack propaga-tion sites,which critically affects HE ***,this study aims to investigate the HE behav-ior of BCC-TrIP MEAs by designing four V10Cr10Co30Fe50-xNix(x=0,1,2,and 3 at％)MEAs,adjusting both the initial phase constituent and phase metastability.A decreased Ni content leads to a reduced fraction and mechanical stability of FCC,which in turn increases HE susceptibility,as determined through electro-chemical hydrogen pre-charging and slow-strain rate tests The permeation test and thermal desorption analysis reveal that the hydrogen diffusivity and content are affected by initial BCC fraction,interconnec-tivity of BCC,and refined *** these initial phase constituents differ between the alloys with FCC-and BCC-dominant initial phase,microstructural factors affecting HE are unveiled discretely among these al-loy groups by correlation of hydrogen-induced crack behavior with hydrogen diffusion and trap *** alloys with an FCC-dominant initial phase,the initial BCC fraction and dIMT initiation rate emerge as critical factors,rather than the extent of *** BCC-dominant alloys,the primary contributor is an increase in the initial BCC fraction,rather than the extent or rate of *** unraveled roles of microstructural factors provide insights into designing HE-resistant BCC-TrIP MEAs.

关键词： Medium-entropy alloys(MEAs) Transformation-induced plasticity(TrIP) Hydrogen embrittlement Hydrogen-induced crack Hydrogen diffusion and trapping

来源：评论

学校读者我要写书评

暂无评论

InGaZnO4 and In2O3 Mobility Trend: The role of Structural disorder from Amorphous to Crystalline States

引用

ACS Materials Letters 2025年 2024-2030页

作者： Jang, Hyeongjun Kim, Taehyun Lee, Wonsok Cho, Minhee Ha, daewon Alam, Muhammad A. Ye, Peide d. Jeong, Changwook Graduate School of Semiconductor Materials and Devices Engineering Ulsan National Institute of Science and Technology Ulsan44919 Korea Republic of Advanced Device Research Lab Semiconductor R&D Center Samsung Electronics Suwon16677 Korea Republic of School of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States

This study investigates the mobility trends of indium-gallium-zinc oxide (IGZO) thin-film transistors over a wide range of fabrication conditions, from amorphous to crystalline phases. By utilizing machine learning potential (MLP) to generate 70 distinct IGZO structures, we analyze electron mobility while taking into account structural disorder and electron scattering mechanisms. Our findings reveal that mobility peaks at the transition from amorphous to nanocrystalline phases, and then, as more ordered, crystalline structures emerge, the mobility decreases sharply due to the distortion of polyhedron of indium-oxygen in well-ordered regions. These results offer critical insights into optimizing the fabrication conditions for high-performance IGZO devices by identifying the ideal structural phase for achieving maximum mobility. © 2025 American Chemical Society.

关键词： Electron scattering

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：