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6th International Conference on Frontier Technologies of Information and Computer, ICFTIC 2024

作者： Meng, Fan Chen, Bing Zhang, Xiu Zhu, Shaohong Nanjing University State Key Lab for Novel Software Technology Nanjing China Nanjing Betterway Information Technology Limited Company Research and Development Department Nanjing China Wuhan Zhongtian Railway Rolling Stock Limited Company Research and Development Department Wuhan China

ISBN: (纸本)9798331541750

Cache prefetching methods have been extensively studied and applied due to their effectiveness in enhancing the computational efficiency of software systems. However, traditional cache prefetching approaches are limited in performance because they fail to leverage domain-specific knowledge. To address this issue, this paper proposes a domain-knowledge and data corporately driven dynamic cache prefetching method. The proposed method first utilizes an autoencoder to autonomously learn implicit features from historical sales data, thereby obtaining their high-dimensional representations. Subsequently, a domain knowledge graph is constructed to integrate various sales behaviors with the aforementioned representations, enabling the learning of a behavioral influence model. Finally, the influence of each sales behavior is jointly learned with the sales representations to train a behavior classifier, which predicts the characteristics of each sales behavior and generates or updates the cache accordingly. Furthermore, we instantiate this method to a real-time scenario in the domain of civil aviation e-commerce ticketing and design the core data structures and functions of this prototype. © 2024 IEEE.

关键词： Sales

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An Innovative Hybrid Cleaning Approach for Contaminant Removal in Semiconductor Packaging 40

An Innovative Hybrid Cleaning Approach for Contaminant Remov...

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40th IEEE International Electronics Manufacturing technology, IEMT 2024

作者： Lim, Chun Yuan Heng, Meng Kong Tiong, Mee Sing Lee, Kwang Jun Amkor Technology Inc Selangor Malaysia Engineering Research & Development Amkor Technology Inc Selangor Malaysia Amkor Technology Inc Incheon Korea Republic of

ISBN: (纸本)9798350388824

Delamination poses a significant challenge in semiconductor industry, particularly in electric vehicle (EV) components, impacting their performance and reliability. It occurs when the adhesion between the encapsulation material and the leadframe fails, often due to thermal stress. Roughened leadframes have been adopted to enhance their interlocking among them. However, this approach inadvertently introduces surface contamination during flux cleaning, which can compromise wire bonding quality. The presence of such contamination underscores the need for more sophisticated cleaning methods. This study investigates a hybrid cleaning solution designed to reduce surface contamination on roughened leadframes. Conventional immersion-type cleaning has shown limitations in effectively addressing this issue. Therefore, a hybrid method combining immersion-type flux cleaning with subsequent spray-in-air cleaning process using deionized (DI) water is proposed. This dual approach leverages the advantages of both immersion and high-pressure DI water spray, improving cleaning efficiency and minimizing contamination. Extensive testing under various conditions has demonstrated a marked reduction in surface contamination compared to conventional methods, significantly lowering the risk of defects such as non-stick on lead (NSOL) or non-stick on pad (NSOP). The paper discusses the mechanism behind this hybrid cleaning approach, offering a pathway forward for optimizing flux cleaning on roughened leadframes and enhancing overall wire bonding reliability. © 2024 IEEE.

关键词： Deionized water

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Study on The Difference of Pore-Fracture Structure Between High-Low Rank Coal under SEM And Its Influence on development 13th

Study on The Difference of Pore-Fracture Structure Between H...

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13th International Field Exploration and development Conference, IFEDC 2023

作者： Zhang, Ya-Lan Xiao, Yu-Hang Liu, Jun-Ying Zhang, Yang Wang, Lei Liu, Yan Su, Xue-Feng Cai, You-Jun Yu, Li Exploration and Development Research Institute PetroChina Huabei Oilfield Company Hebei Renqiu062552 China Engineering Technology Research Institute PetroChina Huabei Oilfield Company Renqiu China Key Laboratory of CBM Resources Efficient Development of Hebei Province Renqiu China Exploration & Development Research Institute North China Oilfield Company Renqiu China

ISBN: (纸本)9789819702671

The pore-fracture in coal rock is the space of accumulation and migration of coalbed methane, it is the key to affect the development of coalbed methane. Field emission scanning electron microscopy was used to study the pore-fracture characteristics of high-low rank coal reservoirs. Taking the high-rank coal of FJ-1 well in Fanzhuang block, southern Qinshui Basin and the low-rank coal of JM18-2 well in Jiergalangtu sag, Erlian Basin as the research objects, observing and analyzing the pore-fracture types, genesis, structures and spatial *** with the development characteristics of its blocks, the differences between the high-low rank coal reservoirs and their impact on development were studied. It is found that the structure of high-rank coal is tight, its pores are mainly micropores, the pore type is mostly gas pore and mould pore, the primary pore is rare affected by metamorphism, occasionally can see the deformed closed cellular pore, the breccia pore are little developed, high-rank coal fractures are mainly developed in vitrinite, mostly are endokinetic fractures and tensile fractures, some of which are filled, poor spatial association and general connectivity, while low-rank coal has loose structure, the pores is dominated by macropores, there are a lot of cellular pores, interclast pores, gas pores and a small number of mould pores, corroded pores and friction pores. The characteristics of pore-fracture development are mainly controlled by the grade of metamorphism, high-rank coal, small pore-fracture scale, poor connectivity, difficult to produce ***-rank coal, pore-fracture well development, it is characterized by largepore size, good connectivity and favorable for fluid migration, but low-rank coal relatively rich in water and have difficulty to drainage pressure reduction. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Scanning electron microscopy

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Identification and functional analysis of CG3526 in spermatogenesis of Drosophila melanogaster

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Insect Science 2024年第1期31卷 79-90页

作者： Qihao Hu Yanhong Xiao Runnan Wei Ting Tang Liang Wen Yuzhen Lu Xiao-Qiang Yu Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology Guangzhou Key Laboratory of Insect Development Regulation and Application ResearchInstitute of Insect Science and TechnologySchool of Life SciencesSouth China Normal UniversityGuangzhou510631 China

Spermatogenesis is a critical part of reproduction in insects;however,its molecular mechanism is still largely *** this study,we identified a testis-specific gene CG3526 in Drosophila *** analysis showed that CG3526 contains a zinc binding domain and 2 C2H2 type zinc fingers,and it is clustered to the vertebrate really interesting new gene(RING)family E3 ubiquitin-protein *** CG3526 was knocked down by RNA interference(RNAi),the testis became much smaller in size,and the apical tip exhibited a sharp and thin end instead of the blunt and round shape in the control *** importantly,compared to the control flies,only a few mature sperm were present in the seminal vesicle of C587-Gal4>CG3526 RNAi *** staining of the testis from CG3526 RNAi flies showed that the homeostasis of testis stem cell niche was disrupted,cell distribution in the apical tip was scattered,and the process of spermatogenesis was not ***,we found that the phenotype of CG3526 RNAi flies’testis was similar to that of testis of Stat92E RNAi flies,the expression level of CG3526 was significantly downregulated in the Stat92EF06346 mutant flies,and the promoter activity of CG3526 was upregulated by *** together,our results indicated that CG3526 is a downstream effector gene in the JAK-STAT signaling pathway that plays a key role in the spermatogenesis of Drosophila.

关键词： CG3526 JAK-STAT spermatogenesis STAT92E testis

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Effective Approach to Achieve Zero Interfacial Delamination on High-Power Automotive Devices After Reliability Test 40

Effective Approach to Achieve Zero Interfacial Delamination ...

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40th IEEE International Electronics Manufacturing technology, IEMT 2024

作者： Tan, Chin Joo Kastor, Azamer Zulkifli, Mohd Hasrul Khamarazaman, Ahmad Shahril Lee, Kwang Jun Tiong, Mee Sing Tan, Boo Wei Engineering Research & Development Amkor Technology Inc Selangor Malaysia Amkor Technology Inc Selangor Malaysia Amkor Technology Inc Incheon Korea Republic of

ISBN: (纸本)9798350388824

The demands of high-power devices for automotive applications are rising rapidly, especially with the booming sales of electric vehicles in recent years. Nevertheless, the interfacial delamination of devices under stringent reliability stresses is often an issue to the manufacturers. To address this issue, lead frame roughening technology is usually employed to improve the interfacial adhesions through mechanical interlocking mechanisms. While this method is generally applicable, it incurs sizeable equipment footprints during mass production with processes including pre-cleaning, roughening, and post-cleaning of the lead frames. Additionally, the usage of hazardous chemicals in the lead frame roughening technology may pose environmental and safety concerns. In this study, a simple yet economical adhesion promoter coating approach is proposed to improve the interfacial adhesion for high-power silicon carbide (SiC) automotive devices. Unlike the roughening technology which only focuses on lead frame surfaces, the adhesion promoter is coated on all molding surfaces including lead frame, wire, solder and die surfaces. This total molding surface coating inclusiveness is essential to eliminate the seed of delamination to grow from all possible interfaces. As a result, the coated automotive devices can achieve zero delamination after the stringent IPC/JEDEC moisture sensitivity level (MSL) 1 conditioning. © 2024 IEEE.

关键词： Molding

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Hybrid Deep Learning Approach for Ship Navigation in Curved River Sections Using PPO and CNN

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Informatica (Slovenia) 2024年第22期48卷 15-30页

作者： Wan, Jianxia Zhang, Sukui Navigation College Jiangsu Maritime Institute Nanjing211170 China Digital Engineering Technology Research Development Center for Maritime Safety and Security Jiangsu Maritime Institute Nanjing211170 China

Curved river sections have complex water flow characteristics and difficulties in maneuvering ships through bends, which pose significant challenges to path planning and ship navigation control. The current path research algorithms still have limitations in dealing with curved and complex waterways. Given this, a convolutional neural network control model based on a hybrid controller and near-end strategy optimization is proposed. This model realizes the path and navigation planning of ships in curved river sections through the hybrid controller. This model utilizes convolutional neural networks to extract channel image features of curved river sections and plans the path through proximal strategy optimization algorithms. In the experiment, high-performance computer processors were used to accelerate the model’s training, and the model was validated in a simulation environment. The results showed that when the research model reached 200 iterations in the simulated curved river section, the average reward value was 0.0323, 19.36% higher than the average reward value of other algorithms. The average instantaneous reward of the research model in path planning was 7.95, which was 3.69 and 1.58 higher than the proximal policy optimization model and the convolutional neural network model based on proximal policy optimization, respectively. The success rate of path planning in complex curved river sections was 82%, significantly higher than the other two algorithms, verifying its effectiveness and superiority in complex path planning tasks. Therefore, this study contributes to improving the safety, efficiency, and economic benefits of ship navigation, and promoting the intelligent and automated growth of the shipping industry © 2024 Slovene Society Informatika. All rights reserved.

关键词： Convolutional neural networks

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The Study and Application of Seepage Reconstruction for Water Plugging in High Permeability Sandstone Reservoirs

The Study and Application of Seepage Reconstruction for Wate...

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2023 SPE International Conference on Oilfield Chemistry, OCC 2023

作者： Zhang, Yanna Li, Liangchuan Yan, Fei Wang, Yucai Research institute of petroleum exploration & development Petrochia Drilling & production technology research institute of Jidong Oilfield

ISBN: (纸本)9781613998748

In the medium/high permeability sandstone reservoirs, long-term water flooding led to large pore channels formed in the reservoir, and the injected water quickly breaks into oil wells along the large pore channels, resulting in water cut increase rapidly and a significant reduction in water flooding efficiency. The traditional water shut-off by chemical or cement squeeze cannot reduce water cut for a long time and cannot increase oil production because they don't change the existing seepage characteristics of the reservoir. The seepage reconstruction is a combination of chemical water shut-off and fracturing technology. It involves innovation on intelligent water control materials and fracturing injection process. There are three plugging slugs, a strong plugging slug, a seepage reconstruction slug, and a tail plugging slug, should be filled into reservoir one by one. The strong plugging slug adopts inorganic polymer to shut-off the large pore by low speed injection. The seepage reconstruction slug is composed of 70-140 mesh quartz sand, 50-80um ceramist and intelligent water control materials with a ratio of 6:3:1, which is carried by low-concentration guar. The tail plugging slug is made of self-consolidated material to prevent sand returning from formation. The technology is used in G111-6 located in J oil field, which is successful in increasing oil production from 3.08bopd to 56.28bopd and reducing the water cut from 96.64% to 78%. The validity period was 492d, and the total oil production was 22624bbls. The technology of seepage reconstruction for water shut-off could effectively reduce the water cut and greatly increase the daily oil production. It effectively improves waterflood development efficiency of medium/high permeability sandstone reservoirs in high water cut stage. The innovation of this technology is the effective combination of fracturing technology and traditional chemical water shut off technology. The goals of water shut-off and oil increase ar

关键词： Seepage

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Review on research and development of oxy-coal burner for carbon capture

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Science China(Technological Sciences) 2024年第3期67卷 647-672页

作者： GUO JunJun LIU JingZhang ZHANG Tai HU Fan LI PengFei LIU ZhaoHui ZHENG ChuGuang State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and Technology Wuhan 430074China CCRC King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China National Key Laboratory of High Efficiency and Low Carbon Utilization of Coal Beijing 100049China Institute of Energy Research Jiangxi Academy of SciencesNanchang 330096China Carbon Neutrality Research Center of Jiangxi Province Nanchang 330096China Faculty of Engineering China University of Geosciences(Wuhan)Wuhan 430074China National Energy Research and Development Center of Clean and Low Carbon Coal-based Power Generation Technologies Wuhan 430074China

In the past two decades, the oxy-fuel combustion of pulverized coal has been extensively developed, leading to the completion of several large industrial pilot oxy-fuel plants worldwide. Various types of oxy-fuel burners have been designed and tested in largescale pilot plants as key components of oxy-fuel combustion. These burners face major challenges in terms of their flame stability because of their decreasing stream momentum ratio and increasing carbon dioxide concentration. However, it offers flexibility in adjusting the oxygen concentration in each burner stream. This study aims to provide a comprehensive review of the state-of-the-art knowledge on oxy-coal burner design and operation in power plants. First, the combustion characteristics under oxy-fuel conditions are briefly introduced. Subsequently, the principal requirements and fundamental parameters of the oxy-coal burners are discussed. The development process of oxy-fuel burners is also presented. Moreover, a compatible design strategy and scaling-up techniques are described for oxy-coal burners developed by the authors over the past ten years. The performances of oxy-coal burners in three large pilot oxy-fuel plants worldwide are summarized and compared. Finally, concluding remarks are provided and potential research needs are suggested.

关键词： carbon capture oxy-fuel combustion oxy-fuel burner pulverized coal compatible design

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Microstructure and tribological performances of W-Cu-Co-xWC alloys with various WC amounts

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Tungsten 2025年第2期7卷 314-326页

作者： Zhen-Ye Tang Cheng Cheng Li-Yong Chen Xiang Cheng Xiao-Long Xie Hao Chen Yu-Wei Ye School of Materials Science and Engineering Jiangxi University of Science and Technology Ganzhou Institute of Tungsten Industrial Technology Key Laboratory of Efficient Exploitation and Utilization of Tungsten Resources of Jiangxi Province Engineering Research Center Ministry of EducationHigh Efficiency Development and Application of Tungsten ResourcesJiangxi University of Science and Technology

In this work, W-Cu-Co-xWC(x = 0, 0.5, 1.5, 2.5, 3.5) alloys were prepared by the activation liquid phase sintering method. The effects of WC doping on the structure and performances of W-Cu-Co alloys were studied using a scanning electron microscope, X-ray diffraction analyzer, energy dispersive spectroscopy, Vickers hardness tester, conductometer, friction and wear machine, and three-dimensional profilometer. Adding an appropriate amount of WC could promote the homogeneous distribution of Cu in the W-skeleton, reducing the internal blockage and improving the densification degree of W-Cu-Co alloys. Compared with W-Cu-Co alloys, W-Cu-Co-1.5WC alloys presented the best comprehensive properties, with a relative density of 98.65%, hardness of 258 HV, and conductivity of 38.1% IACS. Meanwhile, the addition of a small amount of WC could significantly enhance the tribological properties of W-Cu-Co alloys. When the doping amount of WC ranged from 0.5 wt.% to 2.5 wt.%, the wear rate was reduced by over 60%, and the average friction coefficient was lowered by over 19%. However, when the doping amount of WC exceeded 2.5 wt.%, its density and hardness were decreased, resulting in a decrease in wear resistance.

关键词： Activation liquid phase sintering Friction and wear Hardness Tungsten W-Cu alloy WC

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Selective core-shell doping enabling high performance 4.6 V-LiCoO_(2)

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Journal of Energy Chemistry 2024年第8期95卷 684-693,I0015页

作者： Yueming Xia Jianrui Feng Jinhui Li Yan Li Zhengfeng Zhang Xiaoqi Wang Jianli Shao Manling Sui Pengfei Yan Beijing Key Laboratory of Microstructure and Property of Solids College of Materials Science&EngineeringBeijing University of TechnologyBeijing 100124China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

Constructing robust surface and bulk structure is the prerequisite for realizing high performance high voltage LiCoO_(2)(LCO).Herein,we manage to synthesize a surface Mg-doping and bulk Al-doping coreshell structured LCO,which demonstrates excellent cycling ***-cell shows 94.2%capacity retention after 100 cycles at 3.0-4.6 V(***/Li^(+))cycling,and no capacity decay after 300 cycles for fullcell test(3.0-4.55 V).Based on comprehensive microanalysis and theoretical calculations,the degradation mechanisms and doping effects are systematically *** the undoped LCO,high voltage cycling induces severe interfacial and bulk degradations,where cracks,stripe defects,fatigue H2 phase,and spinel phase are identified in grain *** the doped LCO,Mg-doped surface shell can suppress the interfacial degradations,which not only stabilizes the surface structure by forming a thin rock-salt layer but also significantly improves the electronic conductivity,thus enabling superior rate *** Al-doping can suppress the lattice"breathing"effect and the detrimental H3 to H1-3 phase transition,which minimizes the internal strain and defects growth,maintaining the layered structure after prolonged *** theoretical calculations,this work deepens our understanding of the doping effects of Mg and Al,which is valuable in guiding the future material design of high voltage LCO.

关键词： Lithium-ion battery Doping effect Failure mechanism High-voltage LiCoO_(2) Electron microscopy

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