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rock Mechanics Bulletin 2022年第1期1卷 53-68页

作者： Xiaodong Ma Shihuai Zhang Xiaowen Zhang Jiandong Liu Juan Jin Wei Cheng Weidong Jiang Guangming Zhang Zhaowei Chen Mark d.Zoback ETH Zürich Department of Earth SciencesSwitzerland Research Institute of Petroleum Exploration&Development PetroChinaChina Key Laboratory of Oil&Gas Production CNPCChina CNPC Engineering Technology R&D Company Limited China Stanford University Department of GeophysicsUnited States

The Longmaxi shale is an extensive,prolific unconventional play in southwestern *** development in the Changning area is affected by ineffective hydraulic fracturing(HF)stimulation,fault reactivation and casing *** is suspected that the stress contrast within and between the shale reservoirs and the formations above and below matters to hydraulic fracture propagation and reservoir *** this end,the Longmaxi shale in the Changning area deserves a dedicated quantification of the in situ stress state and its *** this study,we re-visit the available data from one of the play’s first appraisal wellbores(X01)for an integrated geomechanics study,focusing on profiling the stress across the Longmaxi and its adjacent *** geophysical logs and other stress indicators,we re-interpret its stress profile in the context of lithological *** resulting stress variations are modeled primarily through a viscoplastic stress relaxation framework,compared with the results via the frictional equilibrium and an elastic theory(the Extended Eaton model).We offer some discussions on the differences and similarities of these stress profiling methods,and examine their applicability to Longmaxi shale in the Changning *** objective is to connect the lithology-controlled stress variations to the first-order complexities(HF ineffectiveness and fault reactivation)that have been observed in the area to date.

关键词： China shale formations

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Conductor design Method considering AC resistance for High Efficiency of PMSM using High Fill Factor Winding

Conductor Design Method considering AC Resistance for High E...

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Magnetic Conference - Short Papers (INTErMAG Short Papers), IEEE International

作者： Kyoung-Soo Cha Myung-Seop Lim Advanced R&D Research Group Korea Institute of Industrial Technology Daegu Republic of Korea Department of Automotive Engineering Hanyang University Seoul Republic of Korea

ISBN: (数字)9798350338362

ISBN: (纸本)9798350338379

This paper proposes the design method of conductor considering AC resistance for high efficiency of PMSM using high fill factor winding. To achieve high power density of the motor, high fill factor winding such as hairpin winding is used. MSO coils were also developed for the same purpose. However, AC resistance is generated in the high fill factor winding used in the motor, which adversely affects the efficiency of the motor. For high efficiency of the motor using high fill factor windings, the AC resistance must be reduced. Therefore, in order to reduce the AC resistance, a design method in which the size of the respective conductor layers are different is proposed. In this paper, the method of reducing AC resistance is verified through analytical methods and FEA. Next, the validity of the proposed method is verified through performance evaluation of the prototype motor designed through the proposed method.

关键词： resistance Performance evaluation Power system measurements Fill factor (solar cell) density measurement Windings AC motors

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Experimental Investigation of a Hexapod Microvibration Isolator for High-Torque Cmg in an Alternative Stewart Platform Configuration

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SSrN 2024年

作者： Chung, Bawoul Lee, Jong-Kuk Song, Tae-Seong Song, deok-Ki Han, Jae-Hung Department of Aerospace Engineering Korea Advanced Institute of Science and Technology Daejeon Korea Republic of Mechanical R&D LIG Nex1 Co. Ltd. Pangyo Korea Republic of

For sensitive payloads in satellites, microvibration is a cause of significant performance degradation. The Control Moment Gyro (CMG), an attitude control device for agile satellites, generates microvibration due to imbalance and irregularities in its high-speed flywheel. As the satellite body transmits microvibration to the sensitive payloads due to its low damping characteristics, it is imperative to isolate microvibration at the source. In this study, a hexapod microvibration isolator based on the Stewart platform is proposed with an alternative configuration. This alternative configuration, originally proposed to reduce coupling transmissibility, is adopted to provide stable performance across a broad frequency range with less weight compared to the widely used cubic configuration in Stewart platform microvibration applications. Modal analysis showed that the alternative configuration is stiffer compared to the cubic configuration. The performance of the isolator was experimentally tested with a high-torque CMG. The proposed hexapod microvibration isolator with an alternative configuration successfully isolated microvibration from the CMG without severe performance degradation. © 2024, The Authors. All rights reserved.

关键词： Satellites

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Modes of multi-mechanistic gas diffusion in shale matrix at varied effective stresses:Observations and analysis

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Petroleum Science 2023年第5期20卷 2908-2920页

作者： Tian-Yu Chen Yan-Yu Hao derek Elsworth Hong-Ming Zhang Zhi-Ming Hu Guang-Lei Cui 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 National Energy Shale Gas R&D(experiment)Center Langfang065007HebeiChina Department of Energy and Mineral Engineering EMS Energy Institute and G3 CenterPennsylvania State UniversityUniversity ParkPA16802USA Research Institute of Petroleum Exploration&Development PetroChina Company LimitedBeijing100084China

Gas diffusion in the shale matrix has a dominant effect on late-stage production from shale gas ***,adequate research on the mechanisms and contributions of gas diffusion for varied pore size populations in shale matrix under recreated in situ stress is *** report gas-diffusion measurements under constant in situ stress but variable gas pressures for contrasting non-adsorbent(helium(He))and adsorbed(methane(CH_(4)))gases to investigate the impact of effective stress on the evolution of dominant mechanisms of *** intact sample replicates true pore-network topology and diffusion *** integrated diffusion model is proposed that combines the effects of slip flow,Knudsen flow,and surface diffusion to constrain the evolution of these flow regimes and their respective contributions to the observational ***,a probability density function(PdF)is employed to separate the gas content distributions of macropores and micropores from the total gas content and to investigate gas contributions in various *** results reveal that the diffusion coefficients of both He and CH_(4) in macropores and micropores increase with gas pressure but decrease with increasing effective *** diffusion coefficients of He and CH_(4) are different in macropores but remain nearly the same in *** diffusion coefficients of slip flow and surface diffusion increase with decreasing effective stress except for CH_(4) diffusion in the micropores,while the evolution of Knudsen diffusion shows the opposite *** flow plays a dominant role in He and CH_(4) diffusion within macropores(pore size 45 nm).Knudsen diffusion gradually becomes significant for He diffusion in the micropores(pore size 4 nm),conversely,for CH_(4) diffusion in the micropores,surface diffusion becomes *** to gas production from reservoirs,the contributions of the micropores will increase gradually with the duration of gas recovery,indicating the significan

关键词： diffusion coefficient In situ stress Varied pore types diffusion mechanisms Gas-content contributions

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Tensor Network-Based Lightweight Energy Forecasting for Virtual Power Plant

Tensor Network-Based Lightweight Energy Forecasting for Virt...

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International Conference on renewable Energy research and Applications (ICrErA)

作者： daichi Watari Hiroki Tanimoto Tsuyoshi Okubo Synge Todo Kaoru Nishiyama Corporate R&D Group KYOCERA Corporation Advanced Technology Research Institute Yokohama Japan Institute for Physics of Intelligence University of Tokyo Bunkyo Tokyo Department of Physics University of Tokyo Bunkyo Tokyo

ISBN: (数字)9798350375589

ISBN: (纸本)9798350375596

Virtual power plant (VPP) operations demand lightweight energy forecasting models due to increasing computational requirements. This paper applies tensor-train (TT) decomposition to a mixture density network (MdN) model, training it from scratch to enhance forecasting accuracy while reducing computational overhead. Our computer experiments demonstrate that the proposed TT-based approach, trained from scratch, outperforms well-known model compression methods such as pruning and singular value decomposition in both parameter reduction and forecasting accuracy. We also explore potential reasons for TT's effectiveness by examining matrix rank properties. This research contributes to the development of efficient and accurate forecasting models crucial for VPP management and renewable energy integration.

关键词： Training renewable energy sources Accuracy Load forecasting Computational modeling Predictive models Virtual power plants Forecasting Load modeling Singular value decomposition

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Experimental Investigation of a Hexapod Microvibration Isolator for High-Torque Cmg in an Alternative Stewart Platform Configuration

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SSrN 2024年

For sensitive payloads in satellites, microvibration is a cause of significant performance degradation. The Control Moment Gyro (CMG), an attitude control device for agile satellites, generates microvibration due to imbalance and irregularities in its high-speed flywheel. As the satellite body transmits microvibration to the sensitive payloads due to its low damping characteristics, it is imperative to isolate microvibration at the source. In this study, a hexapod microvibration isolator based on the Stewart platform is proposed with an alternative configuration. This alternative configuration, originally proposed to reduce coupling transmissibility, is adopted to provide stable performance across a broad frequency range with less weight compared to the widely used cubic configuration in Stewart platform for microvibration applications. Modal analysis showed that the alternative configuration is stiffer compared to the cubic configuration. The performance of the isolator was experimentally tested with a high-torque CMG. The proposed hexapod microvibration isolator with an alternative configuration successfully isolated microvibration from the CMG without severe performance degradation. © 2024, The Authors. All rights reserved.

关键词： Satellites

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Energy-Efficient Cloud Computing through Blockchain-based resource Allocation and Green Contracts

Energy-Efficient Cloud Computing through Blockchain-based Re...

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2024 IEEE International Conference on recent Advances in Science and Engineering technology, ICrASET 2024

作者： Manikandan, G. Swaminathan, Subbiah Kanimozhi, K.V. Seethalakshmi, K. rao, N.Venkatesvara Srm Institute of Science and Technology College of Engineering and Technology Department of Career Development Centre Tamil Nadu Kattankulathur India Rajalakshmi Engineering College Department of Information Technology Tamil Nadu Chennai India Saveetha Institute of Medical and Technical Sciences Saveetha University Saveetha School of Engineering Department of Computer Science and Engineering Tamil Nadu Chennai India Vel Tech Rangarajan Dr. Sagunthala R&d Institute of Science and Technology Department of Computer Science and Engineering Tamil Nadu Chennai India J.N.N.Institute Of Engineering Department of Computer Science and Engineering Ushaa Garden Kannigaipair-Periyapalayam Highway Chennai India

ISBN: (纸本)9798350388602

The study that is being carried out is a blockchain resource allocation, green contract, and renewable energy integration into the cloud computing environments as a way to increase efficiency, sustainability, and stakeholders' satisfaction. Through empirical analysis, significant improvements were observed across various metrics: the resource usage rate is up to 90% from 75%, 20%-800 kWh/hour reduction in energy consumption, a 20% decrease in heat emissions to 400 kg CO2/hour, cost efficiency is improved by 20% to $8 per hour. Moreover, the renewable energy usage was at 50%, which was followed by 50% fossil fuel dependency, in contrast, and a 100% carbon offset. Integrity was ensured with security threats eliminated, reporting and audit became much more transparent and together with the standards the compliance was achieved. Stakeholders such as Providers and End Users experienced enhanced success as the level of satisfaction was made the same for both cloud service providers and consumers This research result highlights the importance of the utilization of the blockchain enabled solutions in the optimization of resources, reducing the energy consumption, promoting the wide-range use of the renewable sources of the energy, enhancing the sector security and transparency therefore improving the satisfaction levels of all stakeholders in the cloud computing operation. The cooperation between scientists and various stakeholders has remained the key factor for implementing sustainable ways that will benefit the industry. © 2024 IEEE.

关键词： Blockchain Cloud Computing Green Contracts renewable Energy Integration resource Allocation

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Advancing giga-strength and high-modulus aluminum matrix composites via nitrogen-induced self-forming process

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Journal of Materials research and technology 2025年 36卷 8876-8894页

作者： Kanhu C. Nayak Se-Hoon Kim Jin-Won Lee donghyun Bae Jae-Pyong Ahn Kon-Bae Lee Hyun-Joo Choi Department of Materials Science and Engineering Kookmin University Seoul 02707 Republic of Korea Advanced Materials R&D Department Korea Automotive Technology Institute (KATECH) Cheonan 31214 Republic of Korea Department of Materials Science and Engineering Yonsei University Seoul 03722 Republic of Korea Data Center Korea Institute of Science and Technology (KIST) Seoul 02792 Republic of Korea

Giga-strength Al/SiC composites with exceptional strength (>1 GPa) and stiffness (>200 GPa), yet low density (<3.0 g/cm 3 ), are produced through a simple yet transformative process that utilizes nitrogen's critical influence on the matrix-reinforcement interface, known as Nitrogen-Induced Self-Forming Aluminum Composites (NISFAC). The Al matrix, reinforced with 20–50 vol% microsized SiC particles, exhibited significant enhancements of mechanical properties, with a 471.93 % increase in compressive strength and a 189.33 % improvement in Young's modulus compared to monolithic aluminum. These improvements are attributed to the formation of aluminum nitride (AlN) and aluminum oxynitride (Al(O)N), which originate on the Al powder surface and integrate into the matrix and Al–SiC interface during the nitrogen-induced self-sintering process. detailed microstructural analysis revealed the critical role of these phases in load transfer from the matrix to the reinforcement. Mechanistic insights and novel predictive models further validated the contributions of reinforcements to the yield strength and Young's modulus. The Al/50 %SiC composite achieved compressive strength over 1 GPa and Young's modulus over 200 GPa, highlighting its potential for advanced structural applications.

关键词： Al/SiC composite Nitrogen-induced self-sintering Interface Giga-strength Nanoindentation Strengthening mechanism

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depositional process of hyperpycnal flow deposits:A case study on Lower Cretaceous Sangyuan outcrop in the Luanping Basin,Northeast China

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China Geology 2024年第3期7卷 505-516页

作者： de-zhi Yan ru-kai Zhu Hao Shou Zhao-hui Xu Wei-hong Liu Si-cheng Zhu Zhi-cheng Lei Jing-ya Zhang Chang Liu Yi Cai Huai-min Xu Research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China National Energy Tight Oil and Gas R&D Center Beijing 100083China PetroChina Key Laboratory of Oil and Gas Reservoir Beijing 100083China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China Jiangxi Engineering Laboratory on Radioactive Geoscience and Big Data Technology Department of Information and EngineeringEast China University of TechnologyNanchang 330013China

Sedimentary process research is of great significance for understanding the distribution and characteristics of *** the detailed observation and measurement of the Sangyuan outcrop in Luanping Basin,this paper studies the depositional process of the hyperpycnal flow deposits,and divides their depositional process into three phases,namely,acceleration,erosion and *** the acceleration phase,hyperpycnal flow begins to enter the basin nearby,and then speeds up *** developed in the acceleration phase are *** addition,the original deposits become unstable and are taken away by hyperpycnal flows under the eroding *** a result,there are a lot of mixture of red mud pebbles outside the basin and gray mud pebbles within the *** the erosion phase,the reverse deposits are eroded and become thinner or even ***,no reverse grading characteristic is found in the proximal major channel that is closer to the source,but it is still preserved in the middle branch channel that is far from the *** entering the deceleration phase,normally grading deposits appear and cover previous *** final deposits in the basin are *** are reverse,and others are *** are superimposed with each other under the action of hyperpycnal *** analysis of the Sangyuan outcrop demonstrates the sedimentary process and distribution of hyperpycnites,and reasonably explain the sedimentary characteristics of *** is helpful to the prediction of oil and gas exploration targets in gravity flow deposits.

关键词： Hyperpycnal flow Sedimentary characteristics depositional process Gravity flow deposit Hyperpycnite red mud pebble Gray mud pebble Oil and gas exploration engineering Luanping Basin

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Quantifying Objective and Perceived Image Quality Through Eeg and Eye-Tracking

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SSrN 2024年

作者： Lim, Changhyun Jeon, Hyun-Jun Jung, Woojae Kwak, Youngshin Lee, Myong Young Ham, Jung Hyun Joo, Hyun Bin Kwon, Oh-Sang Chung, dongil Department of Biomedical Engineering Ulsan National Institute of Science and Technology Ulsan Korea Republic of TV Picture Quality Development Gr. TV R&D Center of LG Electronics Korea Republic of

Image quality evaluation of electronic displays is inherently subjective. To date, user studies in focus groups and viewers’ self-reports have been the primary sources of feedback used as judgment criteria for the display quality. However, little has been known whether the measured responses to visual stimuli, other than self-reports, reflect the objective and subjective levels of image quality on displays. Here, we used electroencephalogram (EEG) and eye-tracking to investigate whether individuals’ neural and physiological responses to visual stimuli track three objectively discerned levels of image quality, as well as their self-ratings on vividness. Our findings reveal that shared and dissociable sets of neurophysiological features successfully tracked both the objective and subjective perspectives of image quality. The current research underscores the effectiveness of EEG and eye-tracking as potential quantitative tools for assessing both the objective image quality disparities and the subjective affective nuances in users' visual display experiences. © 2024, The Authors. All rights reserved.

关键词： Eye tracking

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