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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Hara, Takafumi Sakai, Toshifumi Taniguchi, Shun Ajima, Toshiyuki Ito, Makoto Suto, Tetsuya Takahashi, Akeshi Research & Development Group Connective Drive Systems Research Department Hitachi Ltd. Ibaraki Hitachi Japan Powertrain Technology Development Department Hitachi Astemo Ltd. Ibaraki Hitachinaka Japan

ISBN: (纸本)9798350376067

The ultra-multipole permanent magnet synchronous motor (PMSM) is effective for achieving a high power density for electric vehicle traction motors. However, position detection sensors, such as the resolver for driving ultra-multipole PMSMs, can be higher in cost than conventional electric vehicle traction motors, and if a resolver with the same pole pairs as conventional motors is used, it is assumed that the resolver detection error will be amplified. In this paper, we propose a novel current ripple reduction control suitable for ultra-multipole PMSMs with resolvers. A varying notch filter is used to reduce a specific frequency component. Experiments on the proposed control demonstrate that the ripple of the U-phase current is reduced from ±18 to ±0.2 A. © 2024 IEEE.

关键词： Permanent magnets

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Reliability analysis of discrete-time multi-state star configuration power grid systems with performance sharing

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Soft Computing 2025年第4期29卷 2297-2310页

作者： Su, Peng Zhang, Keyong Shi, Honghua School of Economics and Management North University of China Shanxi Taiyuan030051 China Shanxi Transportation Technology Research and Development Co. LTD Shanxi Taiyuan030032 China

Motivated by practical engineering systems, this paper studies an assessment method for dynamic reliability of a discrete time multi-state star configuration power grid system with performance sharing. The proposed star configuration power grid system consists of n power generation subsystems fixed in star-terminal and one central collection and redistribution subsystem. The star-terminal subsystems with sufficient electric power can first transmit the surplus electric power to the central subsystem, and then the collected electric power in central subsystem is further redistributed to the star-terminal subsystems which are experiencing electric power deficiency through the corresponded transmission links. An algorithm based on the universal generating function (UGF) technique is presented to evaluate the dynamic reliability of the proposed power grid system with performance sharing. Finally, a numerical example and a case study are used to illustrate the accuracy of the proposed model and method. Studies indicate that the steady reliability of the proposed power grid system is improved by 9.41% and 37.28% for the numerical example when comparing the calculation results between performance sharing, unlimited performance sharing and no performance sharing. In the case study, the dynamic reliability of the proposed power grid system increased by 11.5% when comparing the calculation results between with performance sharing and no performance sharing when k→∞. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： Power grids

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Carbonate Fracture-Cavity Reservoirs Prediction technology Based Deep Learning Model 13th

Carbonate Fracture-Cavity Reservoirs Prediction Technology B...

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13th International Field Exploration and development Conference, IFEDC 2023

作者： Li, Ning Gong, Ren-Bin Ren, Liang Ren, Shu-Hang Sun, Jiang- tao Yu, Xiao Gan, Chun-Ting Research Institute of Petroleum Exploration and Development PetroChina Beijing China Artificial Intelligence Technology R&D Center for Exploration and Development CNPC Beijing100083 China Technology Consult Center Research Institute of Petroleum Exploration and Development PetroChina Beijing100083 China Huawei Technology Co. Ltd. Beijing100085 China

ISBN: (纸本)9789819702718

Paleozoic carbonate rock is the key field of oil-gas exploration in Tarim Basin. Fracture-cavity reservoirs are often developed in carbonate reservoirs in Tarim Oilfield, a large amount of oil and gas resources are dis-tributed in Paleozoic reservoirs with different burial depths and scales, accurately and quickly identifying these fracture-cavity reservoirs is Significant to the oil and gas exploration, development, and production of the Tarim Oilfield. With the continuous development of artificial intelligence technology, machine learning methods have been widely applied in various scenarios of oil and gas exploration and development, bringing new opportunities for the development of carbonate reservoir prediction technology. Based on drilling, logging and seismic data, this study comprehensively analyzes the structure, rock and physical properties of carbonate reservoirs in the study area, exploring the main controlling factors of carbonate reservoirs. On this basis, a sample set corresponding to the fracture-cavity reservoirs in the study area was constructed, by using machine learning methods, a prediction model for carbonate rock fracture-cavity reservoirs has been established, which can intelligently predict carbonate rock fracture and cave reservoirs in the research area. The trained model of carbonate rock fracture and cave reservoir prediction can quickly and accurately identify fracture and cave reservoirs on post stack seismic data. This study demonstrates that methods are based on machine learning can quickly and efficiently predict carbonate rock fracture-cavity reservoirs. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Forecasting

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Implications for fault reactivation and seismicity induced by hydraulic fracturing

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Petroleum Science 2024年第2期21卷 1081-1098页

作者： Zi-Han Sun Ming-Guang Che Li-Hong Zhu Shu-Juan Zhang Ji-Yuan Lu Chang-Yu Jin Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines School of Resources and Civil Engineering and Key Laboratory of Liaoning Province on Deep Engineering and Intelligent TechnologyNortheastern UniversityShenyang110819LiaoningChina Research Institute of Petroleum Exploration&Development PetroChina Company LimitedBeijing100084China The Exploration and Development Research Institute of Daqing Oilfield Limited Company Daqing163458HeilongjiangChina

Evaluating the physical mechanisms that link hydraulic fracturing(HF) operations to induced earthquakes and the anticipated form of the resulting events is significant in informing subsurface fluid injection operations. Current understanding supports the overriding role of the effective stress magnitude in triggering earthquakes, while the impact of change rate of effective stress has not been systematically addressed. In this work, a modified critical stiffness was brought up to investigate the likelihood, impact,and mitigation of induced seismicity during and after hydraulic fracturing by developing a poroelastic model based on rate-and-state fraction law and linear stability analysis. In the new criterion, the change rate of effective stress was considered a key variable to explore the evolution of this criterion and hence the likelihood of instability slip of fault. A coupled fluid flow-deformation model was used to represent the entire hydraulic fracturing process in COMSOL Multiphysics. The possibility of triggering an earthquake throughout the entire hydraulic fracturing process, from fracturing to cessation, was investigated considering different fault locations, orientations, and positions along the fault. The competition between the effects of the magnitude and change rate of effective stress was notable at each fracturing stage. The effective stress magnitude is a significant controlling factor during fracturing events, with the change rate dominating when fracturing is suddenly started or stopped. Instability dominates when the magnitude of the effective stress increases(constant injection at each fracturing stage) and the change rate of effective stress decreases(the injection process is suddenly stopped). Fracturing with a high injection rate, a fault adjacent to the hydraulic fracturing location and the position of the junction between the reservoir and fault are important to reduce the Coulomb failure stress(CFS) and enhance the critical stiffness as

关键词： Hydraulic fracturing Coulomb failure stress Rate-and-state fraction model Linear stability analysis Critical stiffness Seismically induced fault

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Enhancing Sustainable Algal Growth and Biomass Conversion in Lebanon: Integrating Photo-bioreactors and Spray Dryer Systems 8

Enhancing Sustainable Algal Growth and Biomass Conversion in...

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8th International Symposium on Innovative Approaches in Smart Technologies, ISAS 2024

作者： Dbouk, Haytham M. Ezzeddine, Mariam Dbouk, Nour Attieh, Layal Maalouf, Noel Innovating Green Technology LLC Beirut Lebanon Research and Development Innovating Green Technology LLC Beirut Lebanon Research and Development Engineer Innovating Green Technology LLC Beirut Lebanon Lebanese American University Department of Electrical and Computer Engineering Byblos Lebanon

ISBN: (纸本)9798331540104

In the quest for sustainable biomass production solutions, this paper introduces an innovative, cost-effective system tailored for algae cultivation and drying, originating from Lebanon. The system integrates a robust plastic tank equipped with a precise thermostat for temperature regulation. Complemented by a recirculation system powered by an air pump, it ensures uniform nutrient distribution and optimal growth conditions within the tank. Additionally, the system integrates a UV disinfection mechanism coupled with a specialized filtration system. Through meticulous examination, this paper elucidates the design, functionality, and operational efficiency of each component, emphasizing its potential to advance sustainable agriculture and bio-resource utilization practices. This paper conducts a thorough examination of the detailed design, functionality, and operational efficiency of each component, emphasizing their combined capacity to transform sustainable agriculture and bio-resource utilization practices. Through the integration of advanced technologies and careful engineering, this cohesive system presents a promising avenue for improving biomass production while mitigating environmental impact. The insights provided in this paper offer valuable contributions to the advancement and adoption of innovative cultivation systems, fostering a path towards more sustainable and resource-efficient biomass production practices in Lebanon and beyond. © 2024 IEEE.

关键词： Tanks (containers)

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Accommodation Capacity Evaluation of Distributed PV Considering Security Constraints of Feeders and Substation Areas

Accommodation Capacity Evaluation of Distributed PV Consider...

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2023 International Conference on Power System technology, PowerCon 2023

作者： Xu, Yan Hu, Peng Dong, Jiansheng Li, Jun Wang, Ning Jiangsu Frontier Electric Technology Product Technology Research and Development Center Nanjing China

ISBN: (纸本)9798350300222

The integration of distributed photovoltaic (PV) has become a crucial way to integrate new energy into power grids with the proposal of the new power system construction strategy. However, ensuring the stable operation of the power grid and the reliable consumption of new energy poses a significant challenge. To address this challenge, this paper proposes an accommodation capacity evaluation method for distributed PV, considering the security constraints of feeders and substation areas. The technical requirements and accommodation mechanism of distributed PV are elaborated, and an evaluation model is established, including objective functions and safety constraints such as main station rated capacity and load distribution. Furthermore, a feeder-area bi-level model solution method is proposed, and the maximum accommodation capacity of distributed PV is solved using the particle swarm optimization (PSO) algorithm, with the node and line number rules given. Finally, the feasibility and effectiveness of the proposed method are verified in a practical power grid example, demonstrating that the proposed method can comprehensively obtain the accommodation capacity of PV, considering various security constraints of the feeders and substation areas. This method provides a guarantee for the safety and stability of new power systems with the large-scale integration of new energy. © 2023 IEEE.

关键词： Particle swarm optimization (PSO)

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Ontology Construction technology of Knowledge Graph in Oil and Gas Exploration and development 13th

Ontology Construction Technology of Knowledge Graph in Oil a...

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13th International Field Exploration and development Conference, IFEDC 2023

作者： Li, Ning Ren, Liang Liu, Zong-Shang Ren, Shu-Hang Xiang, Chong Wu, Bo-Yu Cai, Xuan Research Institute of Petroleum Exploration and Development PetroChina Beijing China Artificial Intelligence Technology R&D Center for Exploration and Development CNPC Beijing100083 China

ISBN: (纸本)9789819702718

With the gradual application of knowledge atlas technology in oil and gas exploration and development fields such as intelligent evaluation of oil and gas reservoir and intelligent identification of oil and gas reservoir through logging, the application of knowledge Atlas in oil and gas industry has attracted more and more attention. In view of the problem of knowledge expression and application in E&P sector field, a professional word bank of E&P was established based on web crawler technology, a feature corpus of E&P field was established by extracting E&P sector related achievement documents and literature data, and the principle of E&P knowledge graph ontology construction was formulated and the construction process was defined. The multistage classification system of oil and gas exploration and development knowledge atlas ontology is described and constructed from multiple dimensions such as sector, object and feature, and the knowledge atlas ontology model of oil and gas exploration and development sector domain is formed, which lays a foundation for the in-depth application of knowledge atlas technology in petroleum exploration and development. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Ontology

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Nickel extraction from nickel laterites: Processes, resources, environment and cost

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China Geology 2025年第1期8卷 187-213页

作者： Zhen-fang Zhang Wei-bo Zhang Zhen-guo Zhang Xiu-fa Chen Development Research Center of China Geological Survey Ministry of Natural ResourcesBeijing 100037China Inner Mongolia University of Technology Hohhot 010062China

With the development of the new energy industry and the depletion of nickel sulfide ore resources,laterite nickel ore has become the main source of primary nickel,and nickel for power batteries has become a new growth point in *** paper systematically summarizes the processes,parameters,products,recovery rates,environmental indicators,costs,advantages,disadvantages and the latest research progress of mainstream nickel extraction processes from laterite nickel *** also provides a comparative analysis of the environmental impact and economic efficiency of different nickel extraction *** is found that the current nickel extraction processes from laterite nickel ore globally for commercial production mainly include the RKEF process for producing ferronickel and the HPAL process for producing intermediate *** former accounts for about 80%of laterite nickel ore *** to each other,the investment cost per ton of nickel metal production capacity for the RKEF is about 43000$,with an operational cost of about 16000$per ton of nickel metal and a total nickel recovery rate of 77%–90%.Its products are mainly used in stainless *** the HPAL process,the investment cost per ton of nickel metal production capacity is about 56000$,with an operational cost of about 15000$per ton of nickel metal and a total nickel recovery rate of 83%–90%.Its products are mainly used in power *** significant differences between the two lies in energy consumption and carbon emissions,with the RKEF being 2.18 and 2.37 times that of the HPAL,*** the use of clean energy can greatly reduce the operational cost and environmental impact of RKEF,if RKEF is converted to producing high Ni matte,its economic and environmental performance still cannot match that of the HPAL and oxygen-enriched side-blown ***,it can be inferred that with the increasing demand for nickel in power batteries,HPAL and oxygen-enriched side

关键词： Laterite nickel ore Limonite Saprolite Nickel extraction Pyrometallurgy Power batteries Hydrometallurgy Cost Environmental impact Life cycle assessment Comprehensive utilization Mineral exploration engineering

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Continual few-shot patch-based learning for anime-style colorization

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Computational Visual Media 2024年第4期10卷 705-723页

作者： Akinobu Maejima Seitaro Shinagawa Hiroyuki Kubo Takuya Funatomi Tatsuo Yotsukura Satoshi Nakamura Yasuhiro Mukaigawa The Research and Development Division OLM DigitalInc.Advanced Research GroupIMAGICA GROUPTokyo 1540023Japan Division of Information Science Graduate School of Science and TechnologyNara Institute of Science and TechnologyNara 6300192Japan Graduate School of Informatics Chiba UniversityChiba 2638522Japan

The automatic colorization of anime line drawings is a challenging problem in production *** advances in deep neural networks have addressed this problem;however,collectingmany images of colorization targets in novel anime work before the colorization process starts leads to chicken-and-egg problems and has become an obstacle to using them in production *** overcome this obstacle,we propose a new patch-based learning method for few-shot anime-style *** learning method adopts an efficient patch sampling technique with position embedding according to the characteristics of anime line *** also present a continuous learning strategy that continuously updates our colorization model using new samples colorized by human *** advantage of our method is that it can learn our colorization model from scratch or pre-trained weights using only a few pre-and post-colorized line drawings that are created by artists in their usual colorization ***,our method can be easily incorporated within existing production *** quantitatively demonstrate that our colorizationmethod outperforms state-of-the-art methods.

关键词： anime colorization few-shot learning continuous learning strategy

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Edge crack damage analysis of AZ31 magnesium alloy hot-rolled plate improved by vertical roll pre-rolling

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Journal of Magnesium and Alloys 2023年第6期11卷 2151-2164页

作者： Zhiquan Huang Chuanlu Qi Jinchao Zou Hongyu Lai Hao Guo Junpeng Wang School of Mechanical Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Nsk(China)Research&Development Co. Ltd.Kunshan 215332China

In the present study,through vertical roll pre-rolling of AZ31 magnesium alloy hot-rolled plate at room temperature,the effect of different vertical roll pre-rolling reduction on edge crack of the plate during flat rolling was systematically *** evolution of microstructure and texture in the edge and middle of the plate after vertical roll pre-rolling,heating and rolling was analyzed by using EBSD *** results show that during the vertical roll pre-rolling,{10–12}primary twins and{10–12}-{10–12}secondary twins dominated the edge deformation,while{10–12}primary twins dominated the middle *** the increase of vertical roll pre-rolling reduction,the twin volume fraction of the edge and the middle increased,and the difference between them decreased *** heating,the twin orientation caused by vertical roll pre-rolling was still maintained,and there was a significant difference in grain size between the edge and the *** the reduction rate of flat rolling was 30%,cracks have already appeared in the initial plate,while the vertical roll pre-rolled samples showed extremely high rolling *** the reduction rate of flat rolling was 50%,the 8PR sample still had no crack *** addition,after flat rolling of 50%,the initial plate showed a strong basal texture,while the maximum pole density of the 8PR plate was small,and the texture distribution was very scattered,showing the characteristics of weak orientation.

关键词： AZ31 magnesium alloy Vertical roll pre-rolling Edge crack {10–12}Twins Texture

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