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56th U.S. rock Mechanics/Geomechanics Symposium

作者： Ma, Lijun dong, Jingnan Wang, Jinzhong Zhang, Yuda Li, Guotao Li, Jingcui Department of Well Engineering Supervise Changqing Oil Field Company Shaanxi China CNPC Engineering Technology R&D Company Limited Beijing China Jidong Oilfield Company PetroChina Hebei Tangshan China Research Institute of Petroleum Exploration & Development PetroChina Beijing China

ISBN: (纸本)9780979497575

depleted-reservoirs underground gas storage are playing an increasingly important role in seasonal demanding of natural gas, ensuring stable gas supply and strategic reserves. However, due to the physical properties of the reservoir, the problem of sand production in the wellbore cannot be ignored. This research is based on the high-pressure sand production experiment simulation device system. Using the in-situ core, through experiments to simulate the sand production of the high-pressure gas storage reservoir, the sand production is systematically and quantitatively studied. The experimental results show that there are two key pressures for sand production caused by the destruction of the inner wall of the wellbore, namely, the equivalent initial sand production pressure (critical confining pressure) and the strength of the thick-walled barrel (collapse pressure). After the confining pressure exceeds the equivalent initial sand production pressure, the core begins to produce sand, and the sand has a relatively smaller particle size. The sand production is found to increases linearly with the equivalent confining pressure. After the confining pressure exceeds the strength of the thick-walled barrel, the core body is damaged and a large amount of sand is produced. The sand body has a relatively large particle size. The particle size distribution indicates the increase of sand particle size during the sand production of the gas storage well. This experiment provides guidance for the operation and completion of gas storage in depleted oil reservoirs, and also provides a quantitatively experimental method for the study of wellbore sand production. © 2022 ArMA, American rock Mechanics Association.

关键词： Sand

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Microstructure Formation Mechanisms of Spinodal Fe–Cu Alloys Fabricated Using Electron-Beam Powder Bed Fusion

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SSrN 2023年

作者： Lee, Haejin Cho, Minhyung Choi, Minho Song, Yeonghwan Lee, Kwangchoon Lee, Byoungsoo Functional Materials and Components R&D Group Korea Institute of Industrial Technology Gangneung25440 Korea Republic of MTA Co. Ltd. Goesan 28023 Korea Republic of

We studied the microstructure formation mechanisms of spinodal Fe–10%Cu alloys fabricated using electron-beam powder bed fusion with various scanning speeds. Cross-correlation electron backscattered diffraction analysis was utilized to investigate the crack initiation and propagation mechanisms related to dislocation density and residual stress in the as-built Fe–10%Cu alloys. The as-built alloys with low scanning speeds have equiaxed microstructures with coarse grains including Cu particles. As the scanning speed increased, the grain size and Cu particle size decreased, and micro-cracks initiated at the edge of lack-of-fusion defects and then grew along the grain boundary parallel to the built direction (Bd). In addition, coarse Fe3O4 particles formed on the boundary caused a decrease in thermal conductivity and tensile strength. A strong compressive residual stress parallel to the Bd acts as a driving force for micro-crack propagation. The rapid cooling rate enhances local dislocation density, and lattice rotation causes micro-crack growth, thereby deteriorating mechanical and thermal properties. Therefore, the scanning speeds should be controlled below 2000 mm/s to obtain good strength and superior conductivity of the spinodal Fe-Cu alloy. © 2023, The Authors. All rights reserved.

关键词： Electron beams

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A proposal on dynamic bandwidth allocation for one-dimensionally moving mobile entities

A proposal on dynamic bandwidth allocation for one-dimension...

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International Conference on Information Networking

作者： Yuta Tachikawa Yuki Hatanaka ryo Murakami Tetsuya Yokotani Hiroshi Minemo Seiji Kozaki Takeshi Suehiro Kenichi Nakura Shigenori Tani Department of Electrical and Electronic Engineering (Graduate School of Engineering) Kanazawa Institute of Technology Ishikawa Japan (department of technology) Department of Electrical and Electronic Engineering Kanazawa Institute of Technology Ishikawa Japan (Graduate School of Science and Technology) Shizuoka University Shizuoka Japan Mitsubishi Electric Corporation (Development Division) Information Technology R&D Center Kanagawa Japan

ISBN: (数字)9798331506940

ISBN: (纸本)9798331506957

recent years, with the introduction of 5th generation mobile communication networks, bursty traffic and upstream traffic characteristics have changed significantly. The deployment of small cells and passive optical networks for highspeed broadband services are considered. Passive optical network technology can apply to multiplex many small cells. The authors have proposed BCOM as a bandwidth control scheme for uplink traffic and have carried out bandwidth allocation, assuming the case where mobile vehicles pass according to schedule. In this paper, BCOMs evaluate assuming that mobile vehicles do not arrive on schedule.

关键词： Multiplexing Schedules Bandwidth Channel allocation Passive optical networks Broadband communication resource management Proposals Vehicle dynamics Uplink

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Optimal modelling of Colding parameters for round inserts with respect to tool use-time criteria

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Procedia CIrP 2025年 133卷 286-291页

作者： Juan Manuel Bello Bermejo Berk Saatçi daniel Johansson Sören Hägglund Jan-Eric Ståhl Christina Windmark Division of Production and Materials Engineering Lund University LTH Ole Römers Väg 1 Lund 221 00 Sweden R&D Seco Tools AB Björnbacksvägen 10 737 47 Fagersta Sweden Production Technology University West Gustava Melins Gata 2 Trollhättan 461 86 Sweden

Optimization of machining processes, such as milling, is essential for industrial efficiency and product quality. To achieve greater efficiency, it is necessary to understand how tools wear down in different conditions in order to anticipate possible undesirable events like sudden breakage or unpredictable degradation. This study focuses on understanding tool wear in dry milling of compacted graphite iron (CGI) EN-GJV-450 using PVd-coated cemented carbide and cBN tools to predict tool life effectively. The research builds on the Colding model, an empirical framework for tool life estimation, by incorporating and comparing two chip thickness concepts in order to optimize the Colding model’s performance, maximum chip thickness (h max ) and equivalent chip thickness (h e ). Through systematic experimentation and modelling, this work has identified optimal conditions for tool life prediction, with h max offering a potentially resource-efficient cross-validation alternative aligned with sustainability goals. The results demonstrate that the optimized Colding model effectively predicts tool life for both coated cemented carbide and cBN cutting tools with round geometry in dry milling of CGI. The insights gained further enhance our understanding of the milling process and provide a solid foundation for selecting appropriate machining parameters to extend tool life and improve process efficiency.

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Electric Current Induced Enhancement of recrystallization Kinetics in Steel 6

Electric Current Induced Enhancement of Recrystallization Ki...

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6th International Conference on ThermoMechanical Processing, TMP 2022

作者： Han, Heung Nam Jeong, Kyeongjae Hong, Sung-Tae Kim, Moon-Jo Jin, Sung-Woo Department of Materials Science and Engineering Seoul National University Seoul08826 Korea Republic of School of Mechanical Engineering University of Ulsan Ulsan44610 Korea Republic of Smart Liquid Processing R&D Department Korea Institute of Industrial Technology Incheon21999 Korea Republic of

ISBN: (纸本)9787502492441

The origin of electric current-induced kinetic enhancement on microstructural and mechanical behavior has been elucidated to stem from the drastic weakening of atomic bonding near defects owing to a charge imbalance. As one example of this phenomenon, we investigate and quantify the athermal effect that occurs during recrystallization by electric current treatment. A comparison with the heat-treated specimens clearly shows that the degree of recrystallization is enhanced by the electric current treatment. Furthermore, a unique tendency of the recrystallization fraction over electric current density is demonstrated to be well quantified by introducing the effective activation energy and temperature. © TMP 2022 - Proceedings. All rights reserved.

关键词： recrystallization (metallurgy)

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Effect of extrusion ratios on hardness,microstructure,and crystal texture anisotropy in pure niobium tubes subjected to hydrostatic extrusion

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Transactions of Nonferrous Metals Society of China 2021年第6期31卷 1689-1699页

作者： Jongbeom LEE Haguk JEONG Sangyong PArK Advanced Materials and Process R&D Department Korea Institute of Industrial TechnologyIncheon City21999Korea Department of Advanced Materials Science and Engineering Inha UniversityIncheon City22212Korea

Nb tubes were fabricated through hydrostatic extrusion at extrusion ratios of 3.1 and 6.1 at ambient temperature,and then their microstructure,texture,and Vickers hardness were investigated based on electron back-scattered diffraction(EBSd)*** fraction of low-angle boundaries(LABs)largely decreased with a sharp decrease in mean grain sizes after hydrostatic extrusion and was not proportional to extrusion ratios,assuming that mixed-asymmetrical junctions forming LABs dissociate at high extrusion ratios from the external stress(>981 MPa)with thermal activation by the generated *** correlation between grain size and Vickers hardness followed the Hall−Petch relationship despite the texture gradient of theá111ñcyclic fiber textural microstructure at low extrusion ratios and theá100ñtrue fiber textural microstructure at high extrusion *** increase in hydrostatic pressure on the Nb tubes contributed to texture evolution in terms of extrusion ratios due to the difference between{110}<111>and{112}<111>components based on EBSd data.

关键词： niobium tube hydrostatic extrusion microstructure characterization mechanical properties texture evolution

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Thermal Cycling Performance of Heterogeneous Sn-Ag-Cu Solder Joint with Minor Elements Addition

Thermal Cycling Performance of Heterogeneous Sn-Ag-Cu Solder...

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Electronics Packaging technology Conference (EPTC)

作者： Joo Young Bae Mi-Song Kim Won Sik Hong Sehoon Yoo Jeong Tak Moon Sang-Bok Park Nam Hyun Kang Korea Electronics Technology Institute Gyeonggi-do Korea Korea Institute of Industrial Technology Incheon Korea Solder Development Team R&D Center MK Electron Co. Ltd. Gyeonggi-do Korea SNF Co. Ltd. Gyeonggi-do Korea Department of Materials Science and Engineering Pusan National University Busan Korea

ISBN: (数字)9798331522001

ISBN: (纸本)9798331522018

Coarse intermetallic compound (IMC) formation can lead to brittleness and generate cracks between the solder and the IMC interface under printed circuit board (PCB) warpage. Microstructure of the solder joint is closely related to its thermo-mechanical properties. Thus, it is essential to control the microstructure of the solder joint. Ball grid array (BGA) packages with 300 μm diameter Sn-3.0Ag-0.5Cu (SAC305) and Sn-2.5Ag-0.8Cu-0.05Ni-1.0Bi (SAC $(-\text{Ni}, \text{Bi}))$ solder balls were soldered with SAC305 solder paste on the PCB coupon. These combinations of homogeneous (SAC305 solder ball and paste) and heterogeneous (SAC(- Ni,Bi) solder ball and SAC305 paste) solder joints were prepared to compare solder joint reliability.

关键词： degradation Transmission line matrix methods Printed circuits Thermomechanical processes Electronic packaging thermal management reliability Microstructure Soldering Stress Thermal degradation

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Preparation and Characterization of Titanium Oxide Nanocapsules Containning retinoic Acid for Sustained release

SSRN

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SSrN 2023年

作者： Yu, Xue-Cheng Zhao, Yun-He Chen, Gang Yu, Jing Wang, ruo-Lan deng, Yu-Hao Wang, Xiao-Ying Yuan, Xin-ru Yu, Xue-Feng He, rui Shenzhen518055 China Blank me R&D Center Yongxi Tech Co. LTD Shanghai200011 China Science and Technology Institute of Advanced Technology Wuhan430000 China Materials Interfaces Center

retinoic acid (rA) has been widely used in cosmetics and medicine due to its anti-aging, anti-acne, and anti-inflammatory effects. However, the high concentration of rA may cause skin allergies and even liver damage, and carcinogenic substances can be generated because of light degradation. Thus, a feasible way is to encapsulate rA in nano titanium dioxide (TiO2) to improve photostability and sustained release. Herein, a convenient and environmental method was developed to realize the sustained release by TiO2 nanocapsules, which were prepared by water-in-oil emulsification reaction and using rA as the core material. The prepared nanocapsules showed improved solubility and enhanced the stability of active ingredients, the utilization rate, the good dispersion in both aqueous and organic phases, significant antibacterial properties, mildew-proof activity, and good photostability. Hence, this is a promising cosmetic raw material for makeup products with additional skincare efficacy. © 2023, The Authors. All rights reserved.

关键词： Nanocapsules

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Wear Mechanisms in Ti(C,N)-Al2o3 Coated Carbide during Sustainable Machining Cgi

SSRN

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SSrN 2023年

作者： Lindvall, rebecka diaz, Kevin Monroe Peng, ru Lin Gutnichenko, Oleksandr Sirén, Sebastian Åberg, Lena Magnusson Norgren, Susanne M’Saoubi, rachid Bushlya, Volodymyr Ståhl, Jan-Eric Division of Production and Materials Engineering Department of Mechanical Engineering Sciences LTH Lund University Ole Römers väg 1 Lund221 00 Sweden Division of Engineering Materials Department of Management and Engineering Linköping University Linköping581 83 Sweden Material Technology Processes and Specialists Volvo Group Trucks Operations BE63934 Skövde541 87 Sweden Sandvik Coromant R&D Lerkrogsvägen 13 Stockholm126 80 Sweden R&D Materials and Technology Development Seco Tools AB Björnbacksvägen 10 Fagersta737 82 Sweden

By replacing conventional gray cast iron (GI) with compacted graphite iron (CGI), automotive industry could keep up with stricter regulations on emissions and demands on higher engine performance. CGI has improved properties as to GI but is more difficult to machine. This study evaluates the machining performance at sustainable machining during finish face milling when using minimum quantity lubrication applied vegetable oil with and without graphite nano-additive, resulting in 8% or 17–23% improved tool life respectively as to dry conditions. The major part of the study investigates the wear mechanisms in commercial Ti(C,N)-Al2O3 CVd-coated cemented carbide. The coating degrades by mechanically induced cracking and fractures, oxidation of adhered CGI inside cracks, diffusional dissolution of Ti(C,N) layer, and reaction of Al2O3 layer with MgO inclusions forming a softer (Mg,Fe,Mn)Al2O4 spinel which is easier removed by the superficial plastic deformation due to chip flow. Other oxide inclusions, when deposited on cemented carbide surfaces, prevents adhesion of CGI material and thus reduces the wear rate. CGI adhering to cemented carbide induces diffusional loss of cobalt and carbon that eventually forms (Fex,Co1-x)3C iron carbide at the tool-workpiece interface which can reduce the diffusion rate. Novel findings also relates to the formation of 15 µm deep cracks in the cemented carbide due to inward diffusion of Fe accompanied by its oxidation that speeds up the oxygen ingress and further oxidation of W and Co. However, oxidation was found to provide a positive effect when the adhered CGI completely oxidized to form Fe2SiO4 oxide ceramic Tool Protection Layer which slowed down tool material degradation. © 2023, The Authors. All rights reserved.

关键词： Wear of materials

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Architecture for Industrial Asset Sensing using LoraWAN and Acquisition Microservice

Architecture for Industrial Asset Sensing using LoRaWAN and ...

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IEEE International Conference on Consumer Electronics-Taiwan (ICCE-TW)

作者： Andrey r. r. Bessa José E. B.S. Linhares Matheus S. Uchôa Adriel V. dos Santos diego A. Amoedo Maria r. A. Souza Edma V.C.U. Mattos Antônio M. C. Pereira Agemilson P. Silva Allan C. Brito rômulo S.F. Jean A. O. Nunes Madson r. Lemos Maura r. A. Costa Waldir S.S. Junior Celso B. Carvalho Federal University of Amazonas and Center for R&D in Elec. and Inf. Tech. (UFAM/CETELI) Amazonas Brazil ENVISION/TPV Group Technology Limited Amazonas Brazil INDT Institute for Technological Development Amazonas Brazil

ISBN: (数字)9798350386844

ISBN: (纸本)9798350386851

This paper, conducted by three partners, UFAM/CETELI, INdT and Envision (TPV Group), presents a data collection architecture with WISE-2410 and ITE11LI sensors, focusing on LoraWAN configurations, and distance tests. The architecture integrates Lora radio, MQTT, and microservices with an ITG201 outdoor gateway. results show accurate network setup, reliable reconnections, strong signal levels, improved device stability, and transmission efficiency. The study demonstrates a robust framework for reliable data collection in diverse applications.

关键词： Wireless communication Wireless sensor networks Microservice architectures LoraWAN data collection Logic gates Sensors

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