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2024 International Conference on Optoelectronic Information and Functional Materials, OIFM 2024

作者： Guo, Weihao Li, Shaowu Zhang, Tingyi Chen, Jinbiao liu, xuwen College Of Intelligent Systems Science and Engineering Hubei Minzu University Hubei Enshi445000 China

ISBN: (纸本)9781510680517

This paper introduces an MPPT control methodology utilizing the IJAVA algorithm. This approach merges the traditional JAVA algorithm with a Levy flight strategy, enabling the algorithm to evade local optima and conduct a comprehensive global search for the optimal solution., so that the algorithm can ensure the convergence speed and give attention to the convergence accuracy, further accelerate the tracking speed by optimizing the initialization position of the population, and reduce the voltage and power oscillation in the tracking process by adding out-of-bounds processing mechanism. Based on the modeling and simulation outcomes, the MPPT control utilizing the IJAVA algorithm demonstrates the capability to effectively and precisely trace the optimum power point in the presence of partial shading, as evidenced by the results. © 2024 SPIE.

关键词： Solar energy

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Localized recrystallization and cracking of lead-free solder interconnections under thermal cycling

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JOURNAL OF MATERIALS RESEARCH 2011年第16期26卷 2103-2116页

作者： Chen, Hongtao Mueller, Maik Mattila, Tonu Tuomas Li, Jue liu, xuwen Wolter, Klaus-Juergen Paulasto-Krockel, Mervi Aalto Univ Sch Sci & Technol Dept Elect FIN-00076 Aalto Finland Harbin Inst Technol Shenzhen Grad Sch Shenzhen 518055 Peoples R China Tech Univ Dresden Elect Packaging Lab IAVT D-01062 Dresden Germany Aalto Univ Sch Chem Technol Dept Mat Sci & Engn Mat Sci Lab FIN-00076 Aalto Finland

The failure mechanism of lead-free solder interconnections of chip scale package-sized Ball Grid Array (BGA) component boards under thermal cycling was studied by employing cross-polarized light microscopy, scanning electronic microscopy, electron backscatter diffraction, and nanoindentation. It was determined that the critical solder interconnections were located underneath the chip corners, instead of the corner most interconnections of the package, and the highest strains and stresses were concentrated at the outer neck regions on the component side of the interconnections. Observations of the failure modes were in good agreement with the finite element results. The failure of the interconnections was associated with changes of microstructures by recrystallization in the strain concentration regions of the solder interconnections. Coarsening of intermetallic particles and the disappearance of the boundaries between the primary Sn cells were observed in both cases. The nanoindentation results showed lower hardness of the recrystallized grains compared with the non-recrystallized regions of the same interconnection. The results show that failure modes are dependent on the localized microstructural changes in the strain concentration regions of the interconnections and the crack paths follow the networks of grain boundaries produced by recrystallization.

关键词： Microstructure Soldering Fatigue

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Employing supercritical n-butanol to remove the EVA film for the delamination of photovoltaic laminated module

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JOURNAL OF SUPERCRITICAL FLUIDS 2025年 219卷

作者： Wang, xuwen liu, Zhifeng Ruan, Haoda Li, Xinyu Zhang, Lei Hefei Univ Technol Sch Mech Engn Hefei 230009 Peoples R China Anhui Prov Key Lab Low Carbon Recycling Technol & Hefei 230009 Peoples R China State Key Lab Environm Adaptabil lndustrial Prod Guangzhou 510300 Peoples R China

The rapid advancement of the photovoltaic (PV) industry has elevated the recycling and reuse of decommissioned PV modules to critical challenges, essential for tackling environmental concerns and achieving resource reutilization. To facilitate the efficient layering of PV modules and recovery of valuable materials, this study proposes a PV module degradation and recycling process utilizing supercritical n-butanol. A systematic evaluation was conducted to assess the effects of various factors on the dissolution ratio of PV modules, with an appropriate range of process parameters selected for optimization. A second-order regression model was developed to predict the dissolution ratio of the EVA film. Comparison of actual dissolution ratio with model predictions confirmed the high accuracy of the fitted model. Finally, characterization and elemental analysis of cells recovered from the supercritical process demonstrated the effectiveness of this recycling method, achieving more thorough degradation on the cell surfaces.

关键词： Photovoltaic Supercritical n-butanol Degradation Recycling Characterization

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Effect of Process Parameters on the Properties of Direct Written Gas-Generating Reactive Layers

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ACS APPLIED POLYMER MATERIALS 2021年第8期3卷 3972-3980页

作者： Sevely, Florent liu, xuwen Wu, Tao Mesnilgrente, Fabien Franc, Bernard Assie-Souleille, Sandrine Dollat, Xavier Rossi, Carole Univ Toulouse LAAS CNRS F-31400 Toulouse France Nanjing Univ Sci & Technol Sch Chem Engn Nanjing 210094 Peoples R China

A mixture of copper complex and AI/CuO nanothermite, Al/CuO/CuC, represents one of the state-of-the-art gas-generating thermite systems with various pyrotechnic applications due to its tunable gas release rates. The reactivity of reactive inks with various loadings of the poly(vinylpyrrolidone) (PVP) binder mixed with Al/CuO/CuC is characterized using high-speed imaging diagnostics and pressure measurements. For a PVP mass fraction of <7 wt %, the printed materials remain highly reactive and burn at a high velocity (10-54 m/s), which was one of the important goals of this study. At higher PVP contents, the polymer inhibits the reaction. Printing (dropwise and continuously writing) of inks containing 5 wt % PVP and 95 wt % reactive Al/CuO/CuC powder was demonstrated using a volumetrically controlled dispenser and a pneumatically actuated syringe. The pressure development and burning rate of the printed materials are 0.37 MPa (at 46.3% theoretical maximum density (TMD)) and 17 m/s (at 0.24% TMD), respectively, more than 10 times faster than the majority of works dealing with printed energetic formulations.

关键词： reactive material 3D printing thermite gas generation energetic materials direct writing

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Occludin Localizes to Centrosomes and Modifies Mitotic Entry

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JOURNAL OF BIOLOGICAL CHEMISTRY 2011年第35期286卷 30847-30858页

作者： Runkle, E. Aaron Sundstrom, Jeffrey M. Runkle, Kristin B. liu, xuwen Antonetti, David A. Univ Michigan Kellogg Eye Ctr Ann Arbor MI 48105 USA Penn State Univ Coll Med Dept Cellular & Mol Physiol Hershey PA 17033 USA Penn State Univ Coll Med Dept Ophthalmol Hershey PA 17033 USA

Proper control of cell cycle progression and barrier function are essential processes to the maintenance of epithelial cell homeostasis. The contribution of tight junction proteins to barrier function is well established, whereas their contribution to cell cycle control is only beginning to be understood. Centrosomes are the principal microtubule organizing centers in eukaryotic cells and centrosome duplication and separation are linked to the cell cycle and mitotic entry. Here we demonstrate that occludin localizes with centrosomes in Madin-Darby canine kidney cells. Immunocytochemistry and biochemical fractionation studies reveal occludin localizes with centrosomes during interphase and occludin Ser-490 phosphorylation at centrosomes increases with mitotic entry. Stable expression of aspartic acid phosphomimetic (S490D) results in centrosomal localization of occludin and increases cell numbers. Furthermore, we provide evidence that occludin regulates centrosome separation and mitotic entry as the nonphosphorylatable alanine mutation (S490A) impedes centrosome separation, delays mitotic entry, and reduces proliferation. Collectively, these studies demonstrate a novel location and function for occludin in centrosome separation and mitosis.

关键词： Cell Cycle Cell Junctions Centrosome Tight Junctions Tubulin MDCK Cells Occludin Phosphorylation

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Behavior of HVOF WC-10Co4Cr Coatings with Different Carbide Size in Fine and Coarse Particle Abrasion

Behavior of HVOF WC-10Co4Cr Coatings with Different Carbide ...

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International Thermal Spray Conference (ITSC 2009)

作者： Ghabchi, Arash Varis, Tommi Turunen, Erja Suhonen, Tomi liu, xuwen Hannula, S. -P. Tech Res Ctr Finland VTT Espoo Finland Aalto Univ Dept Mat Sci & Engn FIN-02150 Espoo Finland SUNY Stony Brook Dept Mat Sci & Engn Ctr Thermal Spray Res Stony Brook NY USA

A modified ASTM G 65 rubber wheel test was employed in wet and dry conditions using 220 nm titania particles and 368 mu m sand particles, respectively. Both tests were conducted on WC-CoCr coatings produced with two powders with different carbide grain sizes (conventional and sub-micron) to address the effect of carbide size and abrasive medium characteristics on the wear performance. The same spot before and after the wet abrasion wear testing was analyzed in detail using SEM to visualize wear mechanisms. It was shown that the wear mechanism depends on the relative size of the carbide and abrasive particles. Wear mechanisms in dry sand abrasion were studied by analyzing the single scratches formed by individual abrasive particles. Interaction of surface open porosity with moving abrasive particles causes formation of single scratches. By tailoring the carbide size, the wear performance can be improved.

关键词： HVOF rubber wheel abrasion test WC-CoCr wear mechanism

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Analysis and Optimization of the Power Generation Right Transfer Mechanism 12

Analysis and Optimization of the Power Generation Right Tran...

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12th IEEE PES Asia-Pacific Power and Energy Engineering Conference, APPEEC 2020

作者： Fan, Jie Jiang, Yu Wang, Yang Ding, Yu liu, xuwen Yao, Yunting State Grid Jiangsu Electric Power Co. Ltd. Nanjing China Southeast University School of Electrical Engineering Nanjing China

ISBN: (纸本)9781728157481

With the further development of China's electricity reform, the consumption of renewable energy in a market-oriented way has become an important goal. The transfer of power generation rights has become the most important form used by Chinese provinces. This paper firstly analyzes the corresponding policy adopted in Jiangsu province and the framework of power generation right transfer trading, and then models and simulates the power generation right transfer trading market by using system dynamics through Vensim software. Finally, the key factors influencing the development of renewable energy in the transfer market of power generation rights are analyzed and optimized. According to this, some Suggestions are put forward to improve the market construction policy. © 2020 IEEE.

关键词： System theory

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Deep Reinforcement Learning Home Energy Management Based Local Energy Trading in a Blockchain Platform 9

Deep Reinforcement Learning Home Energy Management Based Loc...

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9th Asia Conference on Power and Electrical Engineering, ACPEE 2024

作者： Jiang, Yu Feng, Yingchun Fan, Jie Gao, Bo Wang, Yang liu, xuwen Jiangsu Electric Power Trading Center State Grid Jiangsu Electric Power Co. LTD Nanjing China

ISBN: (纸本)9798350309638

Decentralized peer-to-peer Local Energy Markets (LEMs) are gaining popularity as local power production from Renewable Energy Sources (RESs) increases. The study investigates a blockchain-driven LEM in which prosumers and consumers buy and sell energy independently of the involvement of a third party. The suggested scheme involves Home Energy Management (HEM) and demurrage mechanisms that enable both consumers and prosumers to reduce their power prices and improve their power usage. The end-user can likewise move the load to off-peak periods and benefit from lower energy costs from the LEM through the approach. In this solution, HEM and demurrage mechanisms are used to optimize power usage as well as energy costs. As well as providing adequate power for the LEM, it is economically beneficial for end users and the community. The proposed system in the study utilizes the Deep Deterministic Policy Gradient (DDPG) algorithm and demurrage mechanisms to optimize electricity usage and energy costs. Meanwhile, smart contract on the Ethereum blockchain regulate and safeguard the electricity trading process. © 2024 IEEE.

关键词： Blockchain

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Improved Eagle Perching Optimizer Based P2P Energy Trading for Smart Homes 9

Improved Eagle Perching Optimizer Based P2P Energy Trading f...

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9th Asia Conference on Power and Electrical Engineering, ACPEE 2024

作者： Jiang, Yu Feng, Yingchun Fan, Jie Gao, Bo Wang, Yang liu, xuwen State Grid Jiangsu Electric Power Co. LTD Jiangsu Electric Power Trading Center Nanjing China

ISBN: (纸本)9798350309638

The purpose of the study is to optimize power price in smart homes that connect to share energy. A Demand Side Management (DSM) system is used to coordinate P2P energy trading between smart homes using the improved eagle perching optimizer (IEPO). The IEPO algorithm produces optimum solutions for 99% of actual datasets, according to the outcomes. It is possible that consumer price distribution in the microgrid (MG) could be unequal as a result of P2P energy trading. The Pareto optimality principle addresses the issue of unequal price distribution, preventing households from being harmed by improving the costs of others. A final evaluation is performed on the effect of renewable energy and the penetration of storage within the MG. As the renewable energy and the penetration of storage increases, savings cannot necessarily be linear. As the saturation point approaches, they slowly begin to decline. © 2024 IEEE.

关键词： Demand side management

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Fabrication of HKUST-1 Based Ink for Direct Writing of Precursors of Primary Explosives 2nd

Fabrication of HKUST-1 Based Ink for Direct Writing of Precu...

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2nd International Conference on Development and Application of Carbon Nanomaterials in Energetic Materials, ICCN 2021

作者： Yang, Caimin Hu, Yan Zeng, Huipeng liu, xuwen Ye, Yinghua Shen, Ruiqi School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing210094 China Micro-Nano Energetic Devices Key Laboratory Ministry of Industry and Information Technology Nanjing210094 China

ISBN: (纸本)9789811917738

As a direct-write molding technology based on the principle of layer-by-layer accumulation, inkjet printing has shown application prospects in the field of micro-sized energetic materials. Based on HKUST-1, the influence of three binders of polyvinyl alcohol, ethylcellulose, and polyvinylidene fluoride on the printing characteristics of precursor inks was explored. The binder system suitable for ink preparation was screened out, and the best printing parameters were determined. The matching rule between the printing line width and the needle aperture was studied. Moreover, the best ink formula and needle size which can achieve the target line width were selected. The optimized ink was pyrolyzed at a high temperature under an inert atmosphere to prepare a composite of nano-copper coated by porous carbon and copper azide-porous carbon composite energetic materials was in-situ prepared through a gas–solid azidation reaction. This work laid the foundation for the subsequent realization of micro-scale precision charges based on carbon-based copper azide energetic materials. © 2022, China Ordnance Society.

关键词： Ink jet printing

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