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A practical model for production forecast of fractured vertical well in coalbed methane reservoirs: dynamic-drainage-area concept

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A practical model for production forecast of fractured verti...

Offshore technology conference Brasil 2019, OTCB 2019

作者： Sun, Zheng Wu, Keliu Shi, Juntai Fu, Jin Shao, Changchun Zhou, Yu Liu, Chengyuan Jia, Yanran Fang, Jinhui Lv, Ming China University of Petroleum at Beijing Texas A&M Univerisity United States China University of Petroleum at Beijing China CNPC Engineering Technology R&D Company Ltd Tarim Oilfield Branch China National Petroleum Corporation China

ISBN: (纸本)9781613996713

A great deal of attention has been attracted to the exploitation as well as the development of unconventional gas reservoirs, which expect to act as an essential role in counterpoising the daily increasing energy demand around the world. In this research, with the intent of contributing to the successful development of coalbed methane (CBM) reservoirs, which is an indispensable member of the family of unconventional gas reservoirs, a novel production prediction model is proposed for fractured vertical CBM wells. The main difference of the research compared with previous excellent documents is taking the effect of pressure propagation behavior on production performance of CBM wells into account. In general, CBM reservoirs possess the low-permeability ( © 2019, Offshore technology conference

关键词： Forecasting

Emulsion Gels with dual Antioxidant and Antibacterial Functions for Optimized Β-Carotene delivery: Utilizing Phenolic Acid-Modified Agarose

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SSrN 2023年

作者： Fu, Liling ru, Yi Hong, Qinglin Weng, Huifen Zhang, Yonghui Chen, Jun Xiao, Anfeng Xiao, Qiong College of Ocean Food and Biological Engineering Jimei University Xiamen361021 China National R&D Center for Red Alga Processing Technology Xiamen361021 China Fujian Provincial Engineering Technology Research Center of Marine Functional Food Xiamen361021 China Xiamen Key Laboratory of Marine Functional Food Xiamen361021 China Foodstuff Co. Ltd. Zhangzhou363100 China

Agarose based on gel strength can not meet the needs of diverse applications, and the structural modification of agarose is helpful to improve its functional properties and promote the economic benefits of the agar industry chain. This study focuses on making agarose as an active delivery material with specific functions. Agarose (Na-Ag) was modified with phenolic acid (p-coumaric acid, caffeic acid, ferulic acid) to produce agarose derivatives. Structural characterization confirmed the successful grafting of phenolic acids onto agarose through esterification reactions at the C-6 hydroxyl position, enhancing its amphiphilic properties. Emulsifying activity increased from 6.73 for Na-Ag to 23.19 for p-coumaric acid-modified agarose (Pa-Ag), with similar improvements noted for caffeic acid (Ca-Ag) and ferulic acid (Fa-Ag) variants. Emulsion stability was visually and microscopically confirmed, showing uniform droplet distribution in modified agaroses. The study concludes that phenolic acid modifications significantly enhance the emulsifying properties and β-carotene encapsulation of agarose, suggesting a promising approach for improving the delivery and stability of lipophilic compounds in various industries. © 2023, The Authors. All rights reserved.

关键词： Organic acids

research on Welding deformation control technology of Battery Electric Vehicle Framed Aluminum Body

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SSrN 2023年

作者： Yang, Jian Liu, Bo Li, Jia Liao, Xiaolin Yang, Qin Zhang, Jinsheng Hu, Tiegang Jiang, Shuxun School of Mechanical Engineering University of Science and Technology Beijing Beijing100083 China Chongqing Industry Polytechnic College Chongqing401120 China Global R&D Center Chongqing Changan Automobile Co. Ltd Chongqing401120 China Farizon New Energy Commercial Vehicle Group Zhejiang310000 China

The welding process of aluminum (Al) alloy car body has problems such as poor weld quality, low welding coefficient, and large welding deformation. This paper mainly focuses on material accuracy design, lap structure design, simulation, and process manufacturing to break through the precision control problems caused by welding deformation of battery electric vehicle Al alloy car body. First, the 209 key functional dimensional chains of Al body-in-white are analyzed and decomposed to component and profile tolerance dimensions step by step. Moreover, the differences of vertical butt, bevel butt, and plug structures are studied and joint matching is implemented in a targeted manner. Subsequently, through welding deformation simulation analysis and welding sequence optimization, the body-in-white welding process and tooling fixtures are guided and designed to ensure that the dimensional accuracy of the Al body is controlled to ±2mm in all aspects. Finally, the design of the whole vehicle arrangement of mechanical, human-machine, and major components is carried out, and an all-Al framed battery electric vehicle lightweight platform with different sizes and ranges is innovatively created. The difficulties such as the contradiction between power battery size and arrangement space, unreasonable arrangement position, and load distribution are solved. © 2023, The Authors. All rights reserved.

关键词： Aluminum alloys

Active Packaging coatings Based on Agarose Caffeate: Preparation, Characterisation, and Application in Grass Carp (Ctenopharyngodon Idellus) Preservation

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SSrN 2023年

作者： Fu, Liling ru, Yi Hong, Qinglin Zhang, Yonghui Weng, Huifen Yang, Qiuming Xiao, Qiong Xiao, Anfeng College of Ocean Food and Biological Engineering Jimei University Xiamen361021 China National R&D Center for Red Alga Processing Technology Xiamen361021 China Fujian Provincial Engineering Technology Research Center of Marine Functional Food Xiamen361021 China Xiamen Key Laboratory of Marine Functional Food Xiamen361021 China Foodstuff Co. Ltd. Zhangzhou363100 China

Caffeic acid was grafted to agarose by a nonradical synthesis method to overcome precipitation in agarose/caffeic acid blending. Structural characterization showed that the carboxyl group of caffeic acid was successfully grafted to the C6-OH of d-galactose in agarose, and the highest grafting ratio could reach 12.18%. Incorporating caffeic acid significantly increased the antioxidant and bacteriostatic activities. With the increase in grafting ratio from 0 to 12.18%, the scavenging ratio of dPPH increased from 0% to 50.09%, and the inhibition ratio of β-carotene bleaching increased from 7.49% to 72.21%. The bacteriostatic ratio of agarose caffeate (Cf-Ag) against Escherichia coli and Staphylococcus aureus could reach 100%. The fish preservation test indicated that Cf-Ag had positive effects on inhibiting bacterial growth and fat oxidation, reducing the water loss, and prolonging the overall quality of grass carp fillet during refrigeration, which was more effective than native agarose in extending the shelf life of fish. © 2023, The Authors. All rights reserved.

关键词： Fish

Study on the Synergistic Operation of Pumped Storage and Electrochemical Energy Storage under High Percentage New Energy Power System

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Study on the Synergistic Operation of Pumped Storage and Ele...

IEEE conference on Energy Internet and Energy System Integration (EI2)

作者： Gao Guiliang ren Juan Yu Guokang Xin Chaoshan Zhang Shuhua Yao Peng Ye Mengni cong Biao Center for Normative Development Research Economic and Technical Research Institute of State Grid Xinjiang Electric Power Co. Ltd. Urumqi China Technical and Economic Center Economic and Technical Research Institute of State Grid Xinjiang Electric Power Co. Ltd. Urumqi China Design Center Economic and Technical Research Institute of State Grid Xinjiang Electric Power Co. Ltd. Urumqi China School of Electrical and Electronic Engineering North China Electric Power University Beijing China R&D Center - Intelligent Power Distribution and Utilization Technology Department NARI Technology Co. Ltd. Nanjing China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

The amount of renewable energy included into the power system has increased significantly in light of the "dual-carbon" targets, and the inherent stochasticity and intermittency of renewable energy outputs have posed significant issues pertaining to power system stability and security. This necessitates the integration and coordination of various energy storage technologies to enhance the system’s flexibility in scheduling and regulation. This paper presents a day-ahead and intra-day rolling optimal dispatch strategy that incorporates the coordinated participation of pumped storage and electrochemical energy storage. It quantitatively evaluates the system support capabilities and economic benefits of their coordinated operation across four key dimensions: smoothing renewable energy output fluctuations, promoting renewable energy absorption, improving generation reliability, and reducing the burden of system peak shaving. Utilizing data from the Xinjiang provincial power grid, a case study is carried out to evaluate the support capacities of various energy storage coordination solutions within each dimension, confirming the benefits and efficacy of the suggested methodology.

关键词： Economics renewable energy sources Technological innovation Fluctuations Optimization models Power system stability Power grids Power system reliability Systems support Energy storage

Uhpc-Xps Insulation composite Board reinforced by Glass Fiber Mesh: Effect of Structural design On the Heat-Transfer, Mechanical Properties and Impact-resistance

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SSrN 2022年

作者： Zhang, Tongsheng Yuan, Jianming Pang, Huanxin Huang, Zhaoming Guo, Yiqun Wei, Jiangxiong Yu, Qijun School of Materials Science and Engineering South China University of Technology Guangzhou510640 China Guangdong Low Carbon Technology and Engineering Center for Building Materials Guangzhou510640 China Zhongshan Chengsheng Building Materials R&D Co. Ltd Zhongshan528447 China College of Civil Engineering Hefei University of Technology Hefei230009 China

Extruded foamed polystyrene (XPS) and ultra-high performance concrete (UHPC) are the ideal insulation and structural materials for preparing sandwich composite boards, respectively. However, how to design the multilayer structure of composite board to maximize thermal insulation, mechanical properties and impact resistance has not been clarified yet. In this study, styrene-acrylic emulsion was coated on the surface of XPS to improve its wettability, and glass fiber mesh-reinforced bonding mortar with vac-ethylene copolymer emulsion was used to improve the adhesive properties between UHPC and XPS layers. Then the contribution of each layer in heat-transfer, load-bearing, and impact resistance were investigated and simulated by finite element analysis. By separating XPS and UHPC into serval layers, the midspan displacement at peak load and fracture energy of composite boards increased by 689.4 % and 39.1% respectively, then roles of each layer in composite board were discussed. The results provide an effective method to prepare high performance composite board by multilayer structural design, and then promote energy-saving and emission-reduction of prefabricated wall system and even building industrialization. © 2022, The Authors. All rights reserved.

关键词： X ray photoelectron spectroscopy

comparative study of surface contaminated layer on titanium aluminum alloy and titanium alloy investment castings 21st

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Comparative study of surface contaminated layer on titanium ...

21st Chinese Materials conference, CMC 2020

作者： Feng, Zhihua ding, Xianfei Feng, Xin Nan, Hai Zhang, Aibin Beijing Baimtec Material Co. Ltd. Beijing100094 China Cast Titanium Alloy R&D Center AECC Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology Beijing100094 China

ISBN: (纸本)9783035717389

A comparative study of the surface contaminated layer formed by chemical reaction between ceramic-mold and titanium aluminum alloy castings or titanium alloy castings were carried out. The morphology, thickness and hardness of the surface contaminated layer were characterized by means of metalloscopy and microhardness measurement. The results show that surface contaminated layers formed between Ti-Al alloy castings and ceramic-mold, also formed between Ti alloy castings and ceramic-mold. The surface contaminated layers of Ti-Al alloy castings were continuous and compact, their thickness was about 0~90 μm. The surface contaminated layers of titanium alloy castings were not even, their thickness was 0~900 μm. Titanium alloy is more liable to react with the ceramic-mold than the Ti-Al alloy. © 2021 Trans Tech Publications ltd, Switzerland.

关键词： Titanium alloys

Spontaneous Formation and Oxidation of Metal-Phenolic Networks by Zinc Oxide: Expanding Photoprotection and Suppressing Photoreactivity

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SSrN 2025年

作者： Choi, Saehan rahman, rafia Tasnim Kim, Jeonga Kang, Juyeon Shin, Kyounghee Kim, Jin Woong Shim, Jongwon Nam, Yoonsung Daejeon34141 Korea Republic of Department of Applied Chemistry Dongduk Women’s University Seoul02748 Korea Republic of R&D Center Sunjin Beauty Science Co. Ltd. Seoul08588 Korea Republic of School of Chemical Engineering Sungkyunkwan University Suwon16419 Korea Republic of Department of Biological Sciences Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of

Wide-bandgap metal-oxide nanoparticles are promising candidates for broad-spectrum sunscreens, yet their application is limited by photocatalytic activity and insufficient high-energy visible (HEV) light absorption. Here, we report a simple, scalable one-pot strategy for the spontaneous formation of a metal-phenolic network (MPN) on zinc oxide (ZnO) nanoparticles (ZnO/MPN NPs), utilizing intrinsic Zn2+ ion release from ZnO to initiate tannic acid (TA) complexation and in situ oxidation. This process forms a nanoscale MPN layer on the ZnO surface, while ZnO-mediated TA oxidation and dimerization (inspired by natural fruit browning) enhance electron delocalization, extending light absorption to the HEV region. The resulting browned MPN-coated ZnO nanoparticles (ZnO/MPN-B NPs) exhibit a ~ 3-fold increase in sun protection factor (SPF) and UVA protection factor (UVAPF) compared to uncoated ZnO and unbrowned ZnO/MPN NPs. Additionally, the MPN layer effectively suppresses over 99% of photogenerated reactive oxygen species (rOS) through its intrinsic rOS scavenging properties, significantly improving photostability. Cell viability assays further demonstrate that the MPN layer mitigates photoinduced cytotoxicity, supporting the safety and biocompatibility of these hybrids. This study suggests ZnO/MPN-B NPs as eco-friendly, high-performance candidates for next-generation sunscreen formulations, offering a scalable, efficient route to address the dual challenges of photoprotection and safety in inorganic sunscreen agents. © 2025, The Authors. All rights reserved.

关键词： Light absorption

review on Hybrid Power System of Hydrogen Fuel Cell Passenger Vehicles

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Review on Hybrid Power System of Hydrogen Fuel Cell Passenge...

Chinese Automation congress (CAC)

作者： Mengting Zhou Wei Jiang New Energy Automobile Technology R&D Center Guangzhou Automobile Group Co. Ltd Automotive Engineering Institute Guangzhou China

ISBN: (纸本)9781665426480

As a direction of development, hydrogen fuel cell passenger vehicle has a wide market due to its environment- friendly, high conversion efficiency, rapid filling of hydrogen and modularization. According to the connection mode, the hybrid power system topology is divided into direct connection structure and indirect connection structure, each of them has its own advantages and disadvantages. According to the power capacity of the fuel cell system and the battery, it can be divided into three kinds of types: energy compensation, power hybrid and full power, and the type of full power would be the trend for fuel cell passenger vehicle. This article studies on three typical mass-production full-power hydrogen fuel cell passenger vehicles in the world, including Mirai, NEXO, and CLArITY. Analysis are made on their power system topology and parameters, in order to provide references for industry research.

关键词： Voltage measurement Hydrogen Power system dynamics Fuel cells System integration Strategic planning Hybrid power systems