检索结果-内蒙古大学图书馆

SSrN 2024年

作者： Bai, Yingrui Lang, Youming Wang, Ping Wang, ren Bai, Yang Sun, Jinsheng Qingdao266580 China China Petroleum Technology and Development Corporation Beijing100028 China CNPC Engineering Technology R&D Company Limited Beijing102206 China State Key Laboratory Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu610500 China

Lost circulation in fractured formations is a worldwide problem experienced in drilling engineering characterized by low plugging efficiency and poor plugging effect. Adhesive materials are introduced to solve the problems of poor self-adaptation of the conventional composite bridging plugging systems in fractured formations and repeated lost circulation caused by pressure fluctuations. In this study, based on visualization, as well as thermogravimetric, dynamic thermomechanical, and particle-size analyses, the viscoelasticity, high-temperature stability, and glass transition characteristics of the adhesive ethylene vinyl acetate (EVA) particles are assessed. The adhesion state of the materials is clarified at specific temperatures, and pressure-bearing experiments are conducted to optimize the formula for lost circulation control. The plugging effect of the conventional composite bridging plugging system is compared with that of the proposed system to reveal the optimal dosages of the adhesive material and the mechanisms of action. The experimental results reveal that the adhesive EVA particles have good thermal stability (thermally decomposes after 374 °C) and viscoelasticity. A simulation experiment involving plugging a 2-mm fracture using the adhesive composite bridging plugging system reveals that the pressure-bearing capacity is 12 MPa, the cumulative filtration loss is only 50mL, and the plugging performance is excellent. We inferred that the surface of the adhesive material softened at a specific temperature and possessed strong viscoelasticity, which strengthened the bridging, filling, and twisting of the conventional composite bridging plugging system and increased coherence with the fracture channel surface and increased stationary capacity. The plugging is synergistic, the plugging zone is strengthened, and the success rate of primary plugging is improved. © 2024, The Authors. All rights reserved.

关键词： Viscoelasticity

来源：评论

学校读者我要写书评

暂无评论

Green synthesis of multifunctional carbon dots for anti-cancer and anti-fungal applications

引用

Chinese Journal of Chemical Engineering 2021年第9期34卷 97-104页

作者： Shaojing Zhao Li Huang Yong Xie Bin Wang Feng Wang Minhuan Lan Hunan Provincial Key Laboratory of Micro&Nano Materials Interface Science College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China State Key Laboratory of the Discovery and Development of Novel Pesticide Shenyang Sinochem Agrochemicals R&D Co.Ltd.Shenyang 110021China Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education Hubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Carbon dots(Cds)have become popular nanomaterials in biomedical and agricultural *** we synthesized multifunctional Cds which showed anti-cancer and anti-fungal *** low cytotoxicity,stable fluorescence and high photothermal conversion efficiency enable the Cds with imagingguided photothermal *** Cds also exhibited intrinsic anti-fungal activity even at a low concentration,i.e.,40 mg·L^(-1) of Cds induced 20%mortality in cucumber downy ***,the largeπ-conjugated nanostructure and the richness of amino and hydroxyl groups make them a powerful delivery platform for flumorph(a fungicide)with a high loading efficiency of 47.18%.Meanwhile,the heat converted from the light can accelerate the release of flumorph from Cds,and thus efficiently kill fungus.

关键词： Carbon dots Photothermal therapy Anti-fungus delivery Pesticide

来源：评论

学校读者我要写书评

暂无评论

Low temperature-curable superhydrophobic surface with ultra-mechanical durable and anti-corrosion properties through structural engineering of coniferous ZnO

引用

Progress in Organic Coatings 2023年 184卷

作者： Hu, Chechia Kao, Li-Heng Wang, Shi-Jie Huang, Jui-Hsiung Ko, Min-Lin Chuang, Kao-Shu National Taiwan University of Science and Technology Taipei City106 Taiwan R&D center for Membrane Technology Chung Yuan Christian University Taoyuan City320 Taiwan Department of Chemical and Materials Engineering National Kaohsiung University of Science and Technology Kaohsiung807 Taiwan Department of Green Material Technology Green Technology Research Institute CPC Corporation Kaohsiung City811 Taiwan

Superhydrophobic surfaces (SHS) receive considerable attention because of their wide applications, such as building materials, biomedical materials, and different metallic coatings. This study reports a simple and cost-effective approach for fabricating a robust superhydrophobic surface consisting of 1H,1H,2H,2H-perfluorooctyltriethoxysilane-modified SiO2 and coniferous ZnO nanoparticles dispersed in fluoroethylene vinyl ether (FEVE/FS@ZnO) on a stainless steel substrate. The prepared SHS coatings were curable at room temperature and easy to handle. They exhibited unique hierarchical and re-entrant structures, reducing surface energy and resulting in a long lifetime, significant adhesion enhancement, and superhydrophobic and self-cleaning properties. The highest water contact angle (CA) and roll-off angle were 156° and 3°, respectively, achieved at an optimized ZnO:fluoroalkylsilane mass ratio of 10:0.6. The SHS coatings also showed a significant anti-corrosion effect in a corrosion solution (3.5 wt% NaCl solution) and high stability against various acidic (H2SO4, pH = 1) and basic (NaOH, pH = 13) solutions. In addition, the SHS coating layer exhibited improved durability and stability in sandpaper abrasion and tape peel tests, with a CA of 153° after 130 sandpaper abrasion cycles. These results provide a pathway for the future development of multifunctional coating materials. The robust FEVE/FS@ZnO SHS coating with superhydrophobic and self-cleaning properties could be applied to various functionalized solid surfaces. © 2023 Elsevier B.V.

关键词： Contact angle

来源：评论

学校读者我要写书评

暂无评论

Towards Low Particle Emission Cobalt-Free Studded Tires

SSRN

引用

SSrN 2024年

作者： Olofsson, Ulf Holmström, Erik Lyu, Yezhe Department of Engineering Design KTH Royal Institute of Technology StockholmSE-100 44 Sweden AB Sandvik Coromant R&D Material & Processes StockholmSE-126 80 Sweden Department of Mechanical Engineering Sciences Lund University LundSE-223 63 Sweden

The use of studded tires can cause significant wear of road surfaces that also affect the air quality in urban areas. The studs of today’s studded tires are manufactured from hard metal containing cobalt. In this study, we investigated using alternative cobalt-free hard metal studs to reduce particulate emissions in the future. The tire-to-road interface is subjected to both impact wear and sliding abrasive wear. The alternative hard metal studs were evaluated in parallel with standard studs using two different laboratory test rigs specially designed for wear and particulate emission testing. Stone materials commonly used in the road tarmacadam were utilized as counter material. The results showed that the cobalt-free studs generated lower particle concentrations and less road wear. © 2024, The Authors. All rights reserved.

关键词： Cobalt

来源：评论

学校读者我要写书评

暂无评论

Th3 coating series to realize long tool life and high efficiency cutting

引用

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 2020年第1期67卷 21-23页

作者： Isaka, Masakazu Sasaki, Tomoya Tamaki, Kenshiro Material Development Office R and D Technology Division Mitsubishi Hitachi Tool Engineering Ltd. 13-2 Shinizumi Narita-city286-0825 Japan Material Development Office R and D Technology Division Mitsubishi Hitachi Tool Engineering Ltd. 35-2 Mikami Yasu-city520-2323 Japan Yasu R and D Technology Office R and D Technology Division Mitsubishi Hitachi Tool Engineering Ltd. 35-2 Mikami Yasu-city520-2323 Japan

来源：评论

学校读者我要写书评

暂无评论

Influence Of Microstructural Assemblage Of Substrate On The Adhesion Strength Of Tisin Coated Pcbn Systems

Influence Of Microstructural Assemblage Of Substrate On The ...

引用

World PM 2022 Congress and Exhibition

作者： Gordon, Sandra Jiménez-Piqué, Emilio rodriguez-Suarez, Teresa M'Saoubi, rachid roa, Joan Josep Franca, Luis F.P. Llanes, Luis CIEFMA - Department of Materials Science and Engineering EEBE Universitat Politècnica de Catalunya Barcelona08019 Spain Barcelona Research Center in Multiscale Science and Engineering Universitat Politècnica de Catalunya BarcelonaTech Barcelona08019 Spain Ltd Global Innovation Centre Fermi Avenue OxfordshireOX11 0QR United Kingdom R&D Material and Technology Development Seco Tools AB Fagersta73782 Sweden

ISBN: (纸本)9781899072552

The coating adhesion strength of two TiSiN-coated polycrystalline cubic boron nitride (PcBN) grades is studied in this work. Microstructural assemblage of the PcBN substrate, described in terms of cBN content, binder chemical nature and average cBN grain size, is considered as the main experimental variable. In the present investigation a conical indentation test method is implemented to assess load levels at which cracking and delamination emerge, and their evolution with increasing load. Tests were conducted by using a conical diamond indenter of 200 µm in radius (rockwell C) and applying loads ranging from 98 to 980 N. They were complemented by an extensive and detailed SEM inspection of fracture micro-mechanisms (i.e. type of cracking pattern and delamination). results show that emergence and evolution of damage strongly depend on the substrate microstructural assemblage: the higher the cBN-content, the more resistant to both cracking and delamination is the coated system. © European Powder Metallurgy Association (EPMA)

关键词： Bond strength (materials)

来源：评论

学校读者我要写书评

暂无评论

Influence of Hydrogen Volume/Specimen Surface Area ratio on Hydrogen Embrittlement Sensitivity of X52 Pipeline Steel

SSRN

引用

SSrN 2024年

作者： Peng, Shiyao Zhang, Yan-Hui Li, Ba Wang, Bing Chai, Chong Jia, Shujun Liu, Qingyou Mi, Zhishan PipeChina Science and Technology Institute National Oil & Gas Pipeline Network Corporation China Central Iron and Steel Research Institute Company Limited Beijing100081 China Material Digital R&D Center China Iron & Steel Research Institute Group Beijing100081 China

In the transition towards green energy, long distance transportation of gaseous hydrogen by pipeline is considered to be an economically attractive solution. For safe transportation of hydrogen, it is important to conduct relevant mechanical tests in representative hydrogen environments and working conditions of pipelines to demonstrate acceptable hydrogen embrittlement resistance of the steel. One important issue is the testing condition for the ratio of gaseous hydrogen volume over specimen surface area required in mechanical testing since this has not been specified in any testing standards and codes or investigated. This study investigated this issue by performing slow strain rate tensile (SSrT) testing of an X52 pipeline steel in gaseous hydrogen with different ratios of hydrogen volume/specimen surface area, rv/s, ml/mm2. It was found that, with increasing rv/s ratio, the area reduction of the steel decreased and hydrogen embrittlement sensitivity increased in the range of the rv/s ratios investigated. The saturating rv/s ratio appeared to be ∼2.0 beyond which the effect of rv/s ratio on hydrogen embrittlement sensitivity was relatively small. The macroscopic and microscopic observations on both the fracture and side surfaces of the SSrT tested specimens also found that the tendency to cleavage fracture increased with increasing rv/s ratio. The results of the ab initio molecular dynamics (AIMd) simulations performed also predicted a dependence of hydrogen embrittlement on hydrogen volume when rv/s ratio is relatively small. © 2024, The Authors. All rights reserved.

关键词： Tensile testing

来源：评论

学校读者我要写书评

暂无评论

Simulation Experiment of Sediment Sealing in Old Well of Underground Gas Storage (Ugs)

SSRN

引用

SSrN 2024年

作者： Zhang, Yuda dong, Jingnan Liu, Tianen Guan, Yueyang Ban, Fansheng Yuan, Guangjie Research Institute of Petroleum Exploration & Development PetroChina Beijing100083 China CNPC Engineering Technology R&D Company Limited Beijing102206 China National Engineering Laboratory of Petroleum Drilling Technology Beijing102206 China National Elite Institute of Engineering CNPC Beijing100096 China

UGS is the key place to ensure the stable supply of natural gas, and the plugging effect of old wells will be seriously affected due to its characteristics of strong and alternating injection and withdrawal. In order to study the plugging of old wells with fishing and buried by sediment, a full-scale wellbore sediment sealing simulation experiment and a small-scale core permeability experiment were designed. Considering the factors such as sediment composition, compaction degree and metal surface roughness, the compaction law of fillers and the change law of permeability with rock cuttings content under different top hydraulic conditions were analyzed. The experimental results show that there are two kinds of sealing failure in old wells. One is gas breakthrough, the breakthrough pressure difference is 1.3-2.7 MPa, the breakthrough time is about 30 s, and the dominant channel is the interface between sediment and casing and fishing. The other is gas leakage. The permeability range of the sediment is 0.0024-0.031 d, and the reservoir gas flows along the pore channel of the sediment. This study simulates the sediment plugging old wells in the range of gas storage site, and provides reference for the sealing failure process and mechanism of old wells. © 2024, The Authors. All rights reserved.

关键词： Sediments

来源：评论

学校读者我要写书评

暂无评论

Simulation Experiment of Sediment Sealing in Old Well of Underground Gas Storage (Ugs)

SSRN

引用

SSrN 2024年

作者： Zhang, Yuda Yuan, Guangjie dong, Jingnan Liu, Tianen Guan, Yueyang Ban, Fansheng Research Institute of Petroleum Exploration & Development PetroChina Beijing100083 China CNPC Engineering Technology R&D Company Limited Beijing102206 China National Engineering Laboratory of Petroleum Drilling Technology Beijing102206 China National Elite Institute of Engineering CNPC Beijing100096 China

关键词： Sediments

来源：评论

学校读者我要写书评

暂无评论

Comparison and optimization of an air cooling design for lithium-ion battery packs by using an electrochemical-thermal coupled model 3

Comparison and optimization of an air cooling design for lit...

引用

3rd New Energy and Energy Storage System Control Summit Forum, NEESSC 2023

作者： Zhou, Zhuomin Liang, Jian Yu, Aiqin Qin, Zhengbin Sheng, Yanchao Liu, Haotian Guo, Wei Development Planning Department State Grid Hunan Electric Power Company Limited Changsha China Institute of Economic Research State Grid Xiangtan Electric Power Company Limited Changsha China Institute of Economic Research State Grid Hunan Electric Power Company Limited Changsha China R&D Department Three Gorges Intelligent Industrial Control Technology Co. Ltd Wuhan China

ISBN: (纸本)9798350309348

Compared with other ways of heat dissipation, the capability of the air cooling heavily depends on the geometric forms of the cells’ cases, the arrangements of the cells and the boundary conditions, since the air flow is more arbitrary than other phases. A comprehensive study of the relationship between the cooling effect of the air and the factors lacks fairly until now. An electrochemical-thermal coupled model is proposed to design an air cooling system for lithium-ion cells packs in this study. The temperature, pressure and air velocity distributions are simulated, and the thermal and fluid kinetic behaviors in cells or packs are optimized by using the model. different schemes of geometric forms, air’s velocity and arrangements of cells are compared and analyzed in the process of the heat dissipation. results show that the uniformity of cell temperature throughout the pack was significantly affected by the geometry of cooling ducts. The capability of the heat dissipation in the battery packs is gradually improved when the inlet velocity increases, conversely, if the velocity exceeds 8 m s-1, the heat dissipation capability is not significantly improved. The heat dissipation capability is better in the staggered arrangement of the cells than in aligned arrangement, and the parallel arrangement of batteries is better than the series-wound arrangement. ©2023 IEEE.

关键词： Ions

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：