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Analysis on deformation and Stability of Tunnel Anchor Excavation under Broken rock Mass

IOP conference Series: Earth and Environmental Science 2021年第1期783卷

作者： Yuan Qing Zhang Ziping Xiong Qihuan Chen Shihao CCCC Second Harbor Engineering Co. Ltd Wuhan Hubei China Changda Bridge Construction Technology Transportation Industry Key Laboratory Wuhan Hubei China Transportation Infrastructure Intelligent Manufacturing Technology R&D Center Wuhan Hubei China

Based on the concrete engineering support of the tunnel anchor of the dadu river Bridge on the Sichuan-Tibet railway, the geological background of broken rock mass, extremely developed joints and fissures, and poor self-stability of surrounding rock within the range of side anchors in Chengdu, a three-dimensional elastoplastic numerical calculation method is used. The current engineering geological conditions and the tunnel anchor design plan are to establish a three-dimensional fine numerical simulation model of the Chengdu side tunnel anchor that comprehensively considers rock mass unloading, stratum classification, and anchor tunnel excavation and support structure. The 'excavation-support' process in each construction footage is simulated to realize the three-dimensional calculation of the dynamic construction and support of anchor tunnels, and to study the surrounding rock deformation, stress and plastic zone distribution changes during the excavation process. comprehensive analysis found that the deformation of surrounding rock during excavation shows that it develops toward the empty surface, and the displacement distribution is obviously affected by the distribution of ground stress and rock formation. The greater the buried depth, the greater the deformation of the surrounding rock.

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Back cover: Electrochromism of Nanographenes in the Near-Infrared region (Angew. Chem. Int. Ed. 17/2022)

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Angewandte Chemie International Edition 2022年第17期61卷

作者： Ikuya Matsumoto Prof. dr. ryo Sekiya Hiroji Fukui ren-de Sun Prof. dr. Takeharu Haino Department of Chemistry Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima Hiroshima 739-8526 Japan Advanced Technology Institute Corporate R&D Center Sekisui Chemical Co. Ltd. 2-1 Hyakuyama Shimamoto-cho Mishima-gun Osaka 618-0021 Japan

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rücktitelbild: Electrochromism of Nanographenes in the Near-Infrared region (Angew. Chem. 17/2022)

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Angewandte Chemie 2022年第17期134卷

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Electrochromism of Nanographenes in the Near-Infrared region

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Angewandte Chemie 2022年第17期134卷

Nanographene (NG) is a potential candidate for organic EC materials because of its large π-conjugated system, chemical stability, absorption band covering the visible region, and tunable optical properties by postsynthetic modification. We show that NGs carrying redox-active triphenylamine (TPA) units covalently linked to the NG edge function as EC materials in the NIr region. The hybrid materials can be obtained by the installation of TPA units onto the NG edge and display changes in the absorption spectrum in the NIr region extending to a wavelength of over 2000 nm upon one-electron oxidation and reduction at low potentials (<1.1 V). Time-dependent unrestricted density functional theory calculation of a model NG at the UB3LYP/6-31G(d,p) level of theory suggests that a narrow energy gap between the basal plane and the oxidized TPA unit is responsible for the observed EC function in the NIr region.

关键词： Electrochromism Graphene Graphene Quantum dots Material Chemistry Nanographene

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Optimization of Pad drilling Technologies for Three-dimension Wells in JUNIN Block,Venezuela

Optimization of Pad Drilling Technologies for Three-Dimensio...

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中国石油集团工程技术研究院有限公司首届青年论文报告会

作者： Fu Jin Wang Xi Zhang Shunyuan Liu Bingshan Overseas Drilling Technology Dpt.of CNPC Engineering Technology R&D Company Ltd.

Located in south of Eastern Venezuela Basin,Orinoco Oilfieldis an on-shore heavy oil field in South *** heavy oil is known for its high content of acids,heavy metals and asphaltenes with a viscosity of 1000~ 10000mPa · *** to the reserve report released by PdVSA by the end of 2016,JUNIN Block that is situated in east of Orinoco Oilfield has an OOIP of 178×*** of drilled wells were and distances between offset horizontal intervals were both studied to improve ultimate production rates.3-dimension borehole trajectories were de-signed and the most effective anti-collision measures were *** optimziation 8 ~ 12 horizontal wells are distributed on one *** the horizontal interval extends,the stable production time is prolonged and the accumulative production per well ***,the recovery rate stops increasing when the horizontal interval is over 1600m in JUNIN *** a large space between offset horizontal intervals results in fewer wells and lower costs,but a smaller space contributes to a higher production efficiency per *** the space exceeds 600m,the accumulative production rate increases much more slightly.A three-dimension well trajectory consists of a vertical interval,an angle building interval,an angle holding interval,an angle building & direction changing interval,a direction turning interval as well as an absolute horizontal *** on existing well patterns all wells with 3-dimension trajectories have been placed appropriately on their *** is proved that the optimized borehole trajectories and anti-collision measures are effective in overal field development.

关键词： heavy oil three-dimension trajectory anti-collision horizontal interval spacing

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Explicit gain equations for hybrid graphene-quantum-dot photodetectors

arXiv

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arXiv 2020年

作者： Chen, Kaixiang Zhang, Chufan Zang, Xiaoxian Ma, Fuyuan Chen, Yuanzhen dan, Yaping University of Michigan Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong University Shanghai200240 China Key Laboratory of Solar Energy Utilization & Energy Saving Technology of Zhejiang Province Zhejiang Energy R&D Institute Co. Ltd. Hangzhou311121 China Institute for Quantum Science and Engineering Department of Physics Southern University of Science and Technology Shenzhen518055 China

Graphene is an attractive material for broadband photodetection but suffers from weak light absorption. coating graphene with quantum dots can significantly enhance light absorption and create extraordinarily high photo gain. This high gain is often explained by the classical gain theory which is unfortunately an implicit function and may even be questionable. In this work, we managed to derive explicit gain equations for hybrid graphene-quantum-dot photodetectors. due to the work function mismatch, lead sulfide (PbS) quantum dots coated on graphene will form a surface depletion region near the interface of quantum dots and graphene. Light illumination narrows down the surface depletion region, creating a photovoltage that gates the graphene. As a result, high photo gain in graphene is observed. The explicit gain equations are derived from the theoretical gate transfer characteristics of graphene and the correlation of the photovoltage with the light illumination intensity. The derived explicit gain equations fit well with the experimental data, from which physical parameters are extracted. © 2020, CC BY.

关键词： Graphene

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Effect of Number of Blades on Generating Power In Wind Turbines

Effect of Number of Blades on Generating Power In Wind Turbi...

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Australasian Universities Power engineering conference, AUPEC

作者： Navid Majdi Nasab Jeff Kilby Leila Bakhtiaryfard School of Engineering Computing and Mathematical Sciences Auckland Uinversity of Technology Auckland New Zealand Technology Research Department R&D Center Fusheng Industrial Co.Ltd Taipei Taiwan(R.O.C)

ISBN: (数字)9781728150437

ISBN: (纸本)9781728150444

In this study, performance of different wind turbines is compared with using QBlade software. Normally wind turbines are categorized as Horizontal Axis Wind Turbine (HAWT) and Vertical axis wind turbine (VAWT) which in this paper darrieus type as a VAWT is discussed with HAWT. The airfoil selected for this study is NACA 0012 and from simulations it can be resulted how adding blades influence efficiency in wind turbines. In terms of using wind turbines, number of blades is one of the important parameters. QBlade contains the XFOIL airfoil analysis functionalities which makes a software a single tool that comprises all functionality needed for the design and simulation of vertical and horizontal axis wind turbines. The benefits of the proper airfoil design optimal is increasing the efficiency of wind turbines and maximization of the power produced.

关键词： Blades Wind turbines rotors Automotive components drag Wind speed Atmospheric modeling

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Stator Flux Oriented control of PMSM Applied in Electric Vehicles Traction

Stator Flux Oriented Control of PMSM Applied in Electric Veh...

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IEEE conference on Vehicle Power and Propulsion (VPPC)

作者： Yuliang Wen Hanfeng Zheng Zhaoyang Zhang Jiade Huang Xiaofan Zeng Jianghua Feng Foundation and Platform R&D Center CRRC Zhuzhou Institute Co. Ltd. Zhuzhou China Institute of Electrical Technology and Materials Engineering CRRC Zhuzhou Institute Co. Ltd. Zhuzhou China

As its high power density and efficiency, permanent magnet synchronous motor (PMSM) is widely used in electric vehicles (EV). Indirect Stator Quantities control (ISC) of induction motor (IM) with low torque ripple has an outstanding performance of high dynamic response and stability in the whole speed range, which is needed in the EV traction for power performance and safety. However there are some problems to solve when it is applied to PMSM, such as solving the load angle corresponding to torque and achieving maximum torque per ampere (MTPA) control in the stator flux oriented frame for PMSM. To solve these problems, this paper presents an improved control method of stator flux oriented of PMSM similar to ISC. The simulation and experimental verification are implemented, which demonstrate a good dynamic and steady performance in the whole speed range.

关键词： Torque Stators Vehicle dynamics Permanent magnet motors Electric vehicles Trajectory Inverters

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radial-Force-Based Swirling Actuator with Surface-Permanent-Magnet Structure for Low-Speed High-Torque Applications

Radial-Force-Based Swirling Actuator with Surface-Permanent-...

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IEEE Energy conversion congress and Exposition

作者： Lingyu Chen Adrien Thabuis Akira Chiba Masao Nagano Kimiaki Nakamura Department of Electrical and Electronic Engineering Tokyo Institute of Technology Tokyo Japan Department of Microengineering EPFL Lausanne Switzerland Honda R&D Co. Ltd. Saitama Japan

This paper proposes a swirling actuator that utilizes the electromagnetic radial force and a swirling gear to generate rotational torque. This actuator converts the swirling motion to the rotational motion and is suitable for low-speed high-torque applications. The air-gap flux density and the radial force generation are investigated analytically. The 3d FEA results of the net radial force between the stator and the SPM-structure swirler are presented to evaluate the theoretical results. It is shown that the proposed actuator is possible to realize a maximum torque density of 58 Nm/L for a short time, which is notable in small volume machines.

关键词： Actuators Torque Gears rotors Force Air gaps Stators

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Optimization of welding parameters for the joint interface of rotary friction welds

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AIP conference Proceedings 2022年第1期2648卷

作者： Muralimohan Cheepu S. Venukumar K. Harisivasri Phanindra N. Likhith Mohammad Sameer M. Sai Johith Venkateswarlu devuri Charan Kantumunchu 1Super-TIG Welding Co. Limited Busan 46722 Republic of Korea 2Department of Mechanical Engineering Vardhaman College of Engineering Telangana 501218 India 3Department of Mechanical Engineering Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology Tamilnadu 600062 India 4Department of Mechanical Engineering Marri Laxman Reddy Institute of Technology and Management Telangana 500043 India 5A Division of Methode Electronics Malta Ltd. Hetronic USA Oklahoma USA

dissimilar joining using friction welding is demanding for various applications. Friction welding makes it possible to weld incompatible materials. In the present investigation, carbon steel to high strength steel dissimilar materials was joined using rotary friction welding. The interface characteristics were identified according to the welding conditions. The welding conditions were optimized to observe the intermixing zone width at the weld interface. The major influencing welding parameters of friction pressure, upsetting pressure, and friction time was selected as input factors and intermixing zones as the response factor. The intermixing zone’s width increased with the increase of friction pressure and upsetting pressure along with the friction time. The intermixing zone microstructural analysis revealed the mixed layers of carbon steel and high-strength steel materials in several widths.

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