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Solvent-resistant porous membranes using poly(ether−ether ketone): preparation and application

Frontiers of Chemical Science and engineering 2022年第11期16卷 1536-1559页

作者： Lixin Xing Jiaming Wang Xuehua ruan Gaohong He State Key Laboratory of Fine Chemicals R&D Center of Membrane Science and TechnologySchool of Chemical EngineeringDalian University of TechnologyDalian 116023China School of Chemical Engineering at Panjin Campus Dalian University of TechnologyPanjin 124221China

Poly(ether−ether ketone)(PEEK)is a linear aromatic macromolecule,which can form semi-crystalline aggregative status,allowing PEEK materials to have strong environment tolerance and excellent physicochemical *** materials have become a promising alternative to fabricate particular membranes used in extreme *** the past few decades,many researches and evolutions have emerged in membrane fabrication with PEEK materials and its applications for treating organic solvents and their mixtures;however,there are little systematic and comprehensive literature to summarize fabrication approaches,compile applications,and elaborate PEEK property-structure *** this review,the main approaches to fabricate PEEK-based membranes are illustrated concretely,including conventional thermal-induced and non-solvent-induced phase separation,and novel chemical-induced crystallization;the representative applications in ultrafiltration,nanofiltration and membrane contactor containing organic solvents are demonstrated ***,the mechanism to tune PEEK solubility in solvents,which can be achieved by altering monomers in synthesis processes or changing membrane preparation routes,is deeply ***,the existing problems and the future prospects are also *** review provides positive guidance for designing and fabricating membranes using PEEK and its derivative materials for task-specific applications in harsh conditions.

关键词： PEEK phase inversion solvent-resistant membrane nanofiltration membrane contactor

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Control Study of Enhanced STATCOM for Supercapacitor Applying Virtual Synchronous Generator Control

Control Study of Enhanced STATCOM for Supercapacitor Applyin...

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Nada, Kaho Fujii, Toshiyuki Sano, Kenichiro Mitsubishi Electric Corporation Advanced Technology R&d Center Hyogo Japan Institute of Science Tokyo Department of Electrical and Electronic Engineering Tokyo Japan

ISBN: (纸本)9798350376067

The enhanced static synchronous compensator (E-STATCOM), which is equipped with a supercapacitor and can output active power, is attracting attention as a compensator that can both suppress grid voltage fluctuations and maintain short-term frequency during transients. The authors propose a virtual inertia control based on current control-type converters. The method can suppress overcurrent and manage the dC voltage of the converter, which are issues with the typical grid forming control employing voltage control-type converters. The proposed control configuration is based on an established current-controlled STATCOM. However, a virtual synchronous generator control can be achieved simply by adding to the dC voltage reference of the conventional STATCOM control. The simulation results show that it is possible to achieve continuous operation for the three-phase line to ground fault, and STATCOM's active and reactive power outputs are possible to suppress system oscillations after the fault is cleared. © 2024 IEEE.

关键词： Synchronous generators

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Preparation and Characterization of 3d Printed dECM/GelMA/NC/SA Tissue Engineered Hybrid Scaffold 30th

Preparation and Characterization of 3D Printed dECM/GelMA/NC...

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30th International Conference on Computational and Experimental engineering and Sciences, ICCES 2024

作者： Shu, Yan Ye, Jinmeng Tang, Yuanyuan Fu, Tianlin Xing, Bao Liu, Ke Li, Jie Li, Xiangqin Song, Kedong State Key Laboratory of Fine Chemicals Dalian R&D Center for Stem Cell and Tissue Engineering Dalian University of Technology Dalian116024 China

ISBN: (纸本)9783031687747

At present, in vitro colorectal tumor model has received extensive attention. Among them, decellular matrix (dECM) is widely used in the preparation of tissue engineering scaffolds due to its excellent biocompatibility, low immunity and natural three-dimensional structure. Among them, there are abundant capillaries and lymphatic capillaries in the villi of the fold on the inner surface of the small intestine of pigs, which is conducive to the absorption of nutrients. In this experiment, physical, chemical and biological enzyme methods were combined to decellularize pig small intestine to obtain dECM. SEM and histochemical staining proved that the microstructure of the tissue was not destroyed and the cells were effectively removed after decellularization. Two kinds of hydrogel scaffolds were prepared by 3d extrusion bioprinting using dECM, methacrylated gelatin (GelMA), sodium alginate (SA) and nano-clay (NC). The mechanical properties, microstructure and biocompatibility of scaffolds were characterized. The results showed that dECM can reduce the pore size of the scaffold, improve the mechanical strength of the scaffold, and facilitate cell adhesion, growth, proliferation, migration and aggregation. dECM/GelMA/SA/NC scaffold is expected to provide a promising platform for the construction of colorectal tumor models in vitro. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Tumors

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

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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

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New Mechanical Solutions for Isolating Severe Losses in High Temperature Wells

New Mechanical Solutions for Isolating Severe Losses in High...

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2024 International Petroleum technology Conference, IPTC 2024

作者： Zhan, Guodong david Yao, Yang Guo, Huijuan Aljohar, Abdulwahab Drilling Technology Division EXPEC Advanced Research Center Saudi Aramco Saudi Arabia Drilling Mechanical Department CNPC Engineering Technology R&D Company Limited China

ISBN: (纸本)9781959025184

In recent years, with the development of China's oil and gas exploration to deeper layers, the number of deep & ultra-deep wells has been increasing year by year. The casing layer sequence in the well structure design reaches 6-7 layers, which has tended to the design limit, but the handling ability is still insufficient in the face of sudden complex formations. Complications such as severe loss and different pressure systems in the same formation are encountered during drilling, resulting in early casing, which may not achieve the exploration target in the end. The open hole clad technology based on high performance solid expandable tubular is focus on solving difficult problems that weak and complex formation and severe drilling loses which cannot be effectively plugged or controlled. This paper studies the open hole clad technology based on high performance solid expandable tubular in exploration wells by using the methods of indoor test and field trials. The operation principle and technical characteristics of open hole clad technology are introduced in detail. And the test of expansion tubular performance, expansion cone performance and thread sealing strength were carried out to study the expansion tubular operation process. Then aiming at LZ1 exploration well with complications such as severe loss and different pressure systems in the same formation are encountered during drilling, the open hole clad technology field experiment was carried out, and the clad effect of expansion tubular were analyzed. The research results showed that: (1) the indoor tests of expansion tubular performance, expansion tubular cone performance and thread sealing strength verified the reliability of expandable tubular open hole clad technology which can effectively deal with the severe drilling loses on the safe drilling in exploration wells. (2) LZ-1 exploration wells have successfully created conditions for safe drilling in the target formation of LMX group by using Φ219mm expanda

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Application of BP Neural Network Based on Gray Theory in Back Analysis of Mechanical Parameters of Anhydrous Sand Layer 12

Application of BP Neural Network Based on Gray Theory in Bac...

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12th International Symposium on Project Management, ISPM 2024

作者： Shang, Yanliang Jia, Yahui 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 China

ISBN: (纸本)9798331302344

In this paper, the factors affecting the surface subsidence, including the depth of burial, elastic modulus, Poisson's ratio, cohesion and so on, are considered in combination with the monitoring data of the Huai'anqiao-Xisanjie section of Shijiazhuang Metro Line 3. Gray correlation analysis will sort it with the degree of impact. The Lade-duncan constitutive model developed by FLAC3d software was used to select the two molecules of gray correlation analysis. The BP neural network technique and orthogonal test method were used to predict the tunnel Surface subsidence, and the physical parameters of sandstone surrounding rock are inverted. The numerical simulation of the selected tunnel section is carried out by ANSYS and FLAC3d software. The parameters obtained from the inversion are input into the model, and the deformation of the tunnel surrounding rock and the deformation value of the measuring point are obtained. The numerical deformation and the measured displacement are basically anatomist, then meet the accuracy requirements, can be used as a reference for the late construction. © ISPM 2024.

关键词： Poisson ratio

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3d geomechanical model construction and application of deep shale gas in the Luzhou Block, Sichuan Basin 57

3D geomechanical model construction and application of deep ...

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57th US rock Mechanics/Geomechanics Symposium

作者： Wang, Yuan Yang, Henglin Fu, Li Chen, Gang Yuan, Guangjie Zhang, Heng Wang, Zixin CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China

ISBN: (纸本)9780979497582

deep shale gas with a burial depth of 3500-5000m became an important area for shale gas development in China. The characteristics of the rock's mechanics and the in situ stress have a significant impact on the drilling and fracturing effects of horizontal wells. Finite element simulation is used to build an accurate in situ stress model from the data of acoustic logging, diagnostic fracturing injection test, FMI imaging logging, and stress measurement. The results show that Young's modulus and Poisson's ratio in the Luzhou block change vertically with the deposition time. The Longmaxi reservoir has an abnormally high pore pressure gradient which ranges from 16.7 kPa/m to 21.7 kPa/m. The stress regime of the Luzhou block is primarily strike-slip type, with an overburden pressure gradient of 25.5kPa/m, and a minimum horizontal stress gradient range of 18.8 to 24.5kPa/m. According to wellbore breakouts and acoustic emission experiments of cores, the ratio between σhmax and σhmin is 1.165. The horizontal principal stress of the reservoir increases with the increase of Young's modulus and pore pressure. The conclusion is that high-precision geomechanical models can effectively serve to improve the efficiency of drilling operations, improve the production of single wells and benefit development. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Pore pressure

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development of Intrinsic room-Temperature 2d Ferromagnetic Crystals for 2d Spintronics

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Chinese Physics Letters 2023年第5期40卷 71-77页

作者：靳雯张高节武浩杨丽张文峰常海欣 Center for Joining and Electronic Packaging State Key Laboratory of Material Processing and Die&Mold TechnologySchool of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Shenzhen R&D Center of Huazhong University of Science and Technology Shenzhen 518000China Institute for Quantum Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074China

Two-dimensional(2d)ferromagnetic crystals with fascinating optical and electrical properties are crucial for nanotechnology and have a wide variety of applications in ***,low Curie temperatures of most 2d ferromagnetic crystals seriously hinder their practical applications,thus searching for intrinsic roomtemperature 2d ferromagnetic crystals is of great importance for development of information ***,progresses have been achieved in the last few *** we review recent advances in the field of intrinsic room-temperature 2d ferromagnetic crystals and introduce their applications in spintronic devices based on van der Waals ***,the remaining challenge and future perspective on the development direction of intrinsic room-temperature 2d ferromagnetic crystals for 2d spintronics and van der Waals spintronics are briefly summarized.

关键词： ferromagnetic summarized searching

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Optimization design and Exploration of Locomotion Posture for Serpentine Pipeline robots 3

Optimization Design and Exploration of Locomotion Posture fo...

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3rd International Conference on Intelligent Computing and Next Generation Networks, ICNGN 2024

作者： Li, Zhichao Zhang, Chunguang Liu, Jiarui Li, Shangqing Chu, Shuai Gong, Yingjiao Geng, Wei R&D center SINOMACH Sensing Technology Co. Ltd. National Engineering Research Center Of Transducer Shenyang China SINOMACH Sensing Technology Co. Ltd. National Engineering Research Center Of Transducer Shenyang China

ISBN: (纸本)9798331529222

during the inspection process of seamless steel tubes, the circumferential dynamic deviation of the multi-hub serpentine robot complicates the accurate estimation and control of its axial operating state. To address this challenge, this paper introduces an innovative control method integrating an improved discrete PId with IMU feedback, and thoroughly examines its fundamental principles, modeling strategies, and simulation analyses. This system boasts low overshoot, high steady-state accuracy, and swift response, all while minimizing the occupation of system resources, which is advantageous for realizing time-sharing control by the superordinate system. Additionally, the system is capable of dynamically adjusting the hub motors with minimal control cycles, effectively preventing motor vibrations and severe overheating issues. ©2024 IEEE.

关键词： Three term control systems

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Preparation of Fe-Al Hollow Nano-spherical Catalyst and its Application in Catalytic Cracking of Ethane for Carbon Nanotube Production

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China Petroleum Processing & Petrochemical technology 2024年第4期26卷 39-48页

作者： Liu Bei Wang Taoxiang Li Kang Sun Hongman Wang Youhe Yan Zifeng State Key Laboratory for Heavy Oil Processing China University of PetroleumQingdao 266580China Luoyang R&D Center of Technology of SINOPEC Engineering(Group)Co.Ltd. Luoyang 471003China

Fe-Al catalysts with hollow nano-spherical structures were synthesized following the hard template method using self-made carbon spheres as *** catalytic performance of these catalysts in the production of carbon nanotubes(CNTs)was evaluated through ethane catalytic cracking on a fixed bed ***,the influence of these hollow nanospheres on the yield and quality of CNTs was *** results showed that compared to the irregular-shaped catalyst synthesized by coprecipitation and the catalyst with micro-spherical structures prepared by the impregnation method,the Fe-Al hollow nano-spherical catalysts exhibited significantly enhanced specific surface area and pore volume,reaching 236 m^(2)/g and 0.77 cm^(3)/g,*** a reaction temperature of 700℃ and an ethane feed rate of 90 mL/min,the CNTs yield of Fe-Al hollow nano-spherical catalyst reached as high as 48.6 gCNT/gcat,which was 1.8 and 4.6 times higher than the yield of irregular-shaped(27.7 gCNT/gcat)and micro-spherical(10.5 gCNT/gcat)catalysts,*** was mainly attributed to the hollow cavity structure of Fe-Al catalyst providing sufficient space for the CNTs *** a result,the blockage of catalyst internal pores was prevented by the formed CNTs,which isolated ethane molecules from the active sites and lead to catalyst ***,the CNTs synthesized by Fe-Al hollow nano-spherical catalyst exhibited a uniform diameter distribution and a higher degree of graphitization.

关键词： Fe-Al oxides carbon nanotubes hollow nanospheres ethane catalytic cracking

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