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10th International Conference on Civil engineering, ICCE2023

作者： Jia, Yahui Shang, Yanliang du, Jianhua dang, Hongqian Department of Railway Engineering Shijiazhuang Institute of Railway Technology Shijiazhuang050041 China Application Technology R&D Center of Bridge and Tunnel Intelligent Construction of Hebei Colleges Shijiazhuang China

ISBN: (纸本)9789819743544

At present, there are many control measures for the deformation of subway caused by the excavation of foundation pit. It is worthy of attention that pretreatment measures can effectively reduce the influence of deformation on the subway tunnel under different working conditions. Therefore, the finite element model is established by Midas/GTS to explore the reinforcement effect of two measures of pit bottom reinforcement and isolation pile reinforcement. The results show that: in the excavation of foundation pit, the two schemes have different effects on controlling the deformation of tunnel structure, and the inclination of diameter line is generally smaller. The deformation characteristics of each component structure of the diameter line after the pit bottom reinforcement are similar to those of the unreinforced condition, while the displacement changes of each structure after the isolation pile reinforcement become uniform and reasonable. Isolation pile reinforcement is better than pit bottom reinforcement, especially in reducing the vertical displacement of the structure. The reduction degree of the maximum horizontal displacement after the isolation pile reinforcement is about 24%–31%. Therefore, when selecting the pretreatment method, priority is given to the isolation pile reinforcement method. © The Author(s) 2024.

关键词： reinforcement

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MoS_(2) nanoflowers and PEdOT:PSS nanocomposite enabling wearable dual-mode pressure sensors

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Science China(Technological Sciences) 2024年第6期67卷 1737-1747页

作者： WANG FengMing YANG WeiJia MA Ke SHEN GengZhe SU daoJian LI BaiJun WANG ShuangPeng QIN BoLong ZHANG Chi XIN Yue CAO XiaoBing HE Xin School of Applied Physics and Materials Wuyi UniversityJiangmen529020China Biomaterials R&D Center Zhuhai Institute of Advanced TechnologyChinese Academy of SciencesZhuhai519003China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacao999078China

A versatile sensing platform employing inorganic MoS_(2) nanoflowers and organic poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate)(PEdOT:PSS)has been investigated to develop the resistive and capacitive force-sensitive *** microstructure of the sensing layer heightens the sensitivity and response time of the dual-mode pressure sensors by augmenting electron pathways and inner stress in response to mechanical ***,the capacitive and resistive sensors exhibit sensitivities of 0.37 and 0.12 kPa^(-1),respectively,while demonstrating a remarkable response time of approximately 100 ***,it is noteworthy that the PEdOT:PSS layer exhibits excellent adhesion to polydimethylsiloxane(PdMS)substrates,which contributes to the development of highly robust force-sensitive sensors capable of enduring more than 10000loading/unloading *** combination of MoS_(2)/PEdOT:PSS layers in these dual-mode sensors has shown promising results in detecting human joint movements and subtle physiological ***,the sensors have achieved a remarkable precision rate of 98%in identifying target *** outcomes underscore the significant potential of these sensors for integration into applications such as electronic skin and human-machine interaction.

关键词： MoS_(2)/PEdOT:PSS nanocomposite force-sensitive sensor multi-scaled microstructure physiological signals monitoring object grasping recognition

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design and implementation of the second-generation COSPAS-SArSAT distress beacon based on Sdr 6

Design and implementation of the second-generation COSPAS-SA...

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6th IEEE International Conference on Automation, Electronics and Electrical engineering, AUTEEE 2023

作者： renle, Zheng Wenxue, Liu Chaosan, Yang Jintao, Wan dongyang, Li Jinhai, Li Imecas Communications and Information Engineering R&d Center Beijing China Imecas New Technology Development Department Beijing China

ISBN: (纸本)9798350305623

COSPAS-SArSAT has currently completed the design of a new generation distress beacon systems, namely the second-generation distress beacon system. The second-generation distress beacon adopts dSSS-OQPSK as its basic signal modulation mode, while adopting a new signal detail structure. This paper provides a solution for the hardware implementation of the second-generation COSPAS-SArSAT distress beacon on Software-defined radio (Sdr). Firstly, the baseband signal that meets the definition format of the second-generation beacon standard was generated, and then the second-generation beacon was transmitted through the Universal Software radio Peripheral (USrP). By comparing with specific requirements of the second-generation distress beacon standard, the second-generation beacon generated by this paper can meet the requirements of the second-generation COSPAS-SArSAT distress beacon standard, and the method proposed in this paper has the advantages of flexibility and higher signal reconfigurability. © 2023 IEEE.

关键词： COSPAS-SArSAT dSSS-OQPSK Sdr second-generation distress beacon

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Study on a novel liquid air energy storage system integrated with single-column air separation unit 4

Study on a novel liquid air energy storage system integrated...

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4th International Conference on New Energy and Power engineering, ICNEPE 2024

作者： Li, Ningzhi Zhang, Chaoyu Zhang, Haochen Zhu, Jiahua Lu, Jiayi Zhang, Beiyuan Hu, Peng Feng, Jiangzhe New Energy Engineering Technology Co. Ltd National Energy Wind Power Operation Technology R&d Center Equipment Technology Center Electrical Control Department Beijing China New Energy Engineering Technology Co. Ltd National Energy Wind Power Operation Technology R&d Center Science and Technology Department Beijing China New Energy Engineering Technology Co. Ltd Equipment Technology Center Electrical Control Department Beijing China North China Electric Power University School of Energy Power and Mechanical Engineering Beijing China New Energy Engineering Technology Co. Ltd Beijing China

ISBN: (纸本)9798331516086

Liquid Air Energy Storage (LAES) has emerged as a promising solution for large-scale energy storage. However, current LAES systems face challenges related to high costs. Integrating air separation units (ASUs) with LAES offers the potential to balance grid demand and enhance production efficiency by sharing purification and liquid air storage equipment. This paper presents a LAES system coupled with a single-tower ASU, which is evaluated through steady-state simulation and exergy loss analysis. The system achieves an overall energy efficiency of 38.38%, with the LAES subsystem reaching 46.76% efficiency, and the air separation process consuming 3.39 kg/kWh. Additionally, the influence of the liquid-air split ratio on system performance is analyzed. © 2024 IEEE.

关键词： direct air capture

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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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Key Safe drilling technology and Application of Highly deviated Well for High-Pressure Gas reservoirs in Western the right Bank of the Amu darya river 13th

Key Safe Drilling Technology and Application of Highly Devia...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Li, Gan-Lu Zhong, Zhao Liu, Ji-Tong Cheng, Wei-Heng Ye, dong-Qing Zhou, Hai-Qiu Zhang, Wei Xiao, Yue CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China AM River Natural Gas Company Beijing China

ISBN: (纸本)9789819702558

The west of Amu darya right Bank has complex geologic conditions and active shallow groundwater. The middlesalt-gypsum layers of Kemalian stage contain lenticular high-pressure saline aquifer, and the lower Kalov-Oxfordian reservoir develops high-pressure gas layer and high sulfur content. Complexities such as water invasion, gas kick, wellbore instability and leakage are prone to occur during drilling. The integrated application of suitable characteristic technologies such as wellbore structure optimization technology, strong inhibitive anti-sloughing drilling fluid technology and creep-resistant salt layer drilling fluid technology has effectively solved the problem of safe drilling of highly deviated wells in high-pressure gas reservoirs. This paper focuses on the optimization design of wellbore structure, drilling fluid technology for salt gypsum layer and safe drilling technology for salt gypsum layer. The subject ideas of several technologies in this paper are based on the properties of salt-gypsum layer and wellbore stability. This paper optimizes the seal-point, forms the three-section drilling program. The strong inhibition and anti-collapse drilling fluid system for upper layer and the polysulfonate under saturated-saturated brine drilling fluid system for salt-gypsum layer, and the salt-gypsum layer safe drilling technology are optimized. The integrated application of the above technologies reduces the occurrence of serious drilling fluid leakage, casing collapse and other complexities. The salt-gypsum layers are successfully drilled, and the cementing quality is guaranteed, the risks of safe drilling of highly deviated wells for high-pressure gas reservoirs in this area are effectively reduced, which provides reference for similar reservoirs. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Aquifers

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research on Wellbore Axis Alignment Calibration Method for Casing deformation Ultrasonic Three-dimensional Imaging technology 1

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Song, Heng-Yu Liu, Tian-En dai, Kun Zhang, Xu-Jia Yuan, Guang-Jie Xia, Yan Li, Jing-Cui Zhang, Heng ren, Shi-Ju Pang, Yu-Han CNPC Engineering Technology R&D Company Limited Beijing102206 China National Engineering Research Center of Oil and Gas Drilling and Completion Technology Beijing102206 China Beijing University of Chemical Technology Beijing100029 China

ISBN: (数字)9789819704798

ISBN: (纸本)9789819704781

This study proposes a wellbore axis alignment calibration method for casing deformation ultrasonic three-dimensional imaging technology. This method is based on the characteristic of uneven distribution of data points captured through circumferential scanning when the ultrasonic detection instrument is in an eccentric position. It utilizes the difference in arc lengths between adjacent data points to assign weighted values to each data point. Based on the weighted values of each data point, the weighted averages of the Cartesian coordinates of all data points within one circumference are calculated. The weighted average represents the geometric center coordinates of the casing circumferential curve. The eccentricity is then calculated by subtracting the origin coordinates from the geometric center coordinates. Finally, the eccentricity is used to quantitatively calibrate the wellbore axis alignment. Firstly, the polar coordinates of each data point are converted to Cartesian coordinates using the information of azimuth and distance captured by the scanning instrument. The arc lengths of the data points are calculated based on their coordinates, and the minimum value is selected as the reference. The ratio of each data point’s arc length to the reference value is used as a weighting factor to calculate the weighted average of the Cartesian coordinates. The difference between the weighted average coordinates and the origin represents the offset distance. The planar Cartesian coordinates of all data points are calibrated accordingly, achieving the calibration of wellbore axis alignment in casing deformation ultrasonic three-dimensional imaging. In this study, the two-dimensional alignment calibration was initially performed for standard circular, elliptical, and irregular-shaped casings. A total of 32 data points were selected per circumference, and the calculation results were satisfactory, with a maximum calculation error of 5.5% for the vertical axis offset of the e

关键词： Errors

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Balancing Magnetic and Mechanical Properties of Non-oriented Electrical Steel:Correlation Between Microstructure and Properties

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Acta Metallurgica Sinica(English Letters) 2024年第12期37卷 2136-2149页

作者： Zhaoyang Cheng Jing Liu Chunlei Yu Bolin Zhong Shenglin Chen Bing Fu Soran Birosca The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081China Guangdong Provincial Key Laboratory of New Energy Materials Service Safety College of Material Science and EngineeringShenzhen UniversityShenzhen518060China Hubei Engineering Technology Research Center of Marine Materials and Service Safety Wuhan University of Science and TechnologyWuhan430081China The R&D Center of Wuhan Iron and Steel Co. Ltd.Wuhan430080China School of Mechanical and Design Engineering in the Faculty of Technology University of PortsmouthPortsmouthPO13DJUK

High performance e-motors require a continuous enhancement of physical and mechanical properties for non-oriented electrical steel(NOES).However,the optimization of mechanical and magnetic properties simultaneously during NOES processing is extremely challenging where both properties directly influenced by alloy grain size,crystallographic texture,and dislocation *** the current investigation,recrystallization annealing cycles were employed to modify the microstructure with the aim of balance magnetic and mechanical properties of NOES *** results showed that with increasing annealing temperatures,the degree of recrystallization and grain size increased,while the dislocation density reduced considerably at the early stage of ***,the values of texture parameter A*_(overall)(which is a function of overall individual grain orientations and their alignments with easy magnetization directions)were *** was evident that the magnetic properties were significantly improved,however the alloy strength was reduced with increasing annealing ***,the correlation between magnetic properties as well as alloy strength on grain size,texture,and dislocation density were *** crystallographic texture intensity and measured properties quantitative analyses it was concluded that grain size was the predominant factor in balancing the mechanical and magnetic properties of the studied ***,the optimal comprehensive properties(both magnetic and mechanical)were achieved by annealing at 800℃,which yielded a magnetic induction B5000 of 1.616 T,a high-frequency iron loss P_(1.0/400)of 22.43 W/kg,and a yield strength of 527 MPa.

关键词： High strength non-oriented silicon steel Microstructure Texture Magnetic properties Mechanical properties

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Application of Near-Bit LWd Gamma Image Logging in Horizontal Coalbed Methane reservoir 13th

Application of Near-Bit LWD Gamma Image Logging in Horizonta...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Yang, Qiu-Yi Mao, Wei-Min Fan, Yi-Feng Jia, Heng-Tian Feng, Ze-dong Xie, Xia CNPC Engineering Technology R&D Company Ltd. Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China Qoiltech Company Ltd. Wuxi China

ISBN: (纸本)9789819702558

For judging the formation lithology accurately, guiding the tool to drill in target reservoir, correcting drilling trajectory timely and improving the encounter rate, a near-bit 16-sector imaging LWd system that can be used in water-base and oil-base drilling fluid is presented in this paper. The LWd system is consisted of near-bit gamma imaging sub, screw and data receiving sub. It can be used in unconventional reservoirs such as shale and coalbed methane reservoir to achieve data measurement and stable transmission of near-bit deviation and gamma-ray. Compared with 8-sector gamma imaging, the application of 16-sector dynamic high-precision gamma scanning imaging technology provides more precise, accurate and timely parameters measurement. The near-bit gamma imaging LWd system has been provided successfully used in coalbed methane reservoir. The field application shows that this system exhibits excellent identification for coal lines and carbonaceous mudstones, and could guide drilling tool back to reservoir in the absence of formation, with the drilling ratio of reservoir by 97%. The application of near-bit gamma imaging LWd system in horizontal coalbed methane lay foundation for the study of dynamic high-precision gamma scanning imaging technology used in unconventional reservoirs. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Methane

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Transmission count optimization for environmental monitoring using Bluetooth mesh 12

Transmission count optimization for environmental monitoring...

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12th IEEE Global Conference on Consumer Electronics, GCCE 2023

作者： Ichii, Hiroyuki Sumi, Takenori Nagai, Yukimasa Kawashima, Yuki Kitazawa, Shoichi Mitsubishi Electric Corporation Information Technology R&d Center Kamakura Japan Muroran Institute of Technology Graduate School of Aerospace Engineering Muroran Japan

ISBN: (纸本)9798350340181

Improving livelihood by environmental monitoring is realized by sensor data, e.g. temperature, humidity, light and CO2. Bluetooth mesh is getting attraction to deploy large-scale sensor networks. Bluetooth mesh uses a flooding method that forwards packets to all nodes within the communication range to improve packet delivery rate without acknowledgement. However, if there are nodes in the network with limited transmission paths and packets are lost between them, the E2E (End-to-End) packet delivery rate will decrease. Therefore, we propose a transmission count optimization method to control the number of transmissions in Bluetooth mesh, which appropriately increases the parameter of the number of transmissions only for nodes with limited transmission paths. This improves approximately 1.3 points (default: 98.46%, Proposed: 99.76%) of the E2E packet delivery rate while reducing the increase in power consumption from conventional approach. © 2023 IEEE.

关键词： Bluetooth

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