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Investigation of Electrostatic-Assisted Ultrasonic Atomization and Spraying

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SSrN 2023年

作者： Yang, Yue Yuan, Songmei Zhang, Zikang Lu, Tie R&D Center of High-efficient & Green CNC Machining Technology and Equipment School of Mechanical Engineering and Automation Beihang University Beijing100191 China Ningbo Institute of Technology Beihang University Ningbo315832 China

Ultrasonic atomization technology has been widely used in industry in recent years due to its higher atomization efficiency. This paper proposes a method of electrostatic-assisted ultrasonic atomization spraying and designs a special ultrasonic power supply that can directly introduce high-voltage static electricity onto the surface of the ultrasonic atomization so that the liquid can contact the charge and enhance the charging effect. This paper conducts numerical simulation analysis on the atomization process and statistically analyzes the numerical simulation atomization particle size through image processing. In addition, this paper designs experiments from two aspects of atomization particle size and film-forming effect. The results show that the experimental results are consistent with the numerical simulation results, verifying the accuracy of the numerical simulation results. It shows that in the process of sub-droplet formation, the introduction of static electricity will increase the number of capillary waves, promote two mechanisms of the capillary pinch-off mechanism and the rayleigh-Plain instability, reduce atomization particle size, and increase atomization efficiency. Compared with the traditional airflow beam method, the film-forming surface quality of the electric field beam method is higher and the surface roughness is lower. It solves the problem that airflow affects film-forming quality in traditional ultrasonic spraying with the airflow beam method. It provides a theoretical basis and scientific guidance for the application of electrostatic-assisted ultrasonic atomization technology in the atomization and film preparation industry. © 2023, The Authors. All rights reserved.

关键词： drops

Enhanced Internal Electric Field of Cds/Nu-M Z-Scheme Heterojunction for Efficient Photocatalytic Hydrogen Evolution

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SSrN 2024年

作者： Yu, Gang Liu, Liping Zhao, Chong Guo, Shuaiqi Meng, Haibing Zhu, Yongfa Zhang, Xian-Ming College of Chemistry Taiyuan University of Technology Taiyuan030024 China Department of Chemistry Tsinghua University Beijing100084 China Guizhou Provincial Engineering Technology Research Center for Chemical Drug R&D College of Pharmacy Guizhou Medical University Guiyang550025 China

Metal-organic frameworks (MOFs) as high-efficiency photocatalysts often face limitations due to the inadequate charge separation and sluggish charge transfer kinetics. Herein, we construct an interfacial linker coordinated heterostructure cadmium sulfide/zirconium-based metal-organic framework (CdS/NU-M) for high-efficiency photocatalytic H2 evolution. The interfacial thiol coordination significantly narrows the energy difference between conduction band of NU-M and valence band of CdS, achieving a Z-scheme charge transfer channel in CdS/NU-M. As a result, a robust internal electric field is found in the formed Z-scheme heterojunction, which efficiently facilitates the photogenerated charge separation and transport, inducing CdS/NU-M with an excellent photocatalytic H2 evolution rate of 84.3 mmol g-1 h-1 and prominently surpassing most of the reported MOFs and CdS-based photocatalysts. This work highlights the crucial role of interfacial linker coordination in enhancing charge separation and transfer, significantly improving the photocatalytic performance and providing an effective strategy for designing advanced photocatalysts and related technologies. © 2024, The Authors. All rights reserved.

关键词： Heterojunctions

Effect of compression ratio on microstructure evolution of Mg−10%Al−1%Zn−1%Si alloy prepared by SIMA process

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Transactions of Nonferrous Metals Society of China 2021年第9期31卷 2597-2605页

作者： Li-jie CAO Guo-rui MA Chun-xia WANG Zheng-jian CHEN Jia-heng ZHANG School of Mechanical and Automotive Engineering Shanghai University of Engineering ScienceShanghai 201600China Medical Device R&D Center Zhuhai Institute of Advanced Technology Chinese Academy of SciencesZhuhai 519000China College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004China Biomaterials R&D Center Zhuhai Institute of Advanced Technology Chinese Academy of SciencesZhuhai 519000China School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

A new Mg−10%Al−1%Zn−1%Si alloy with non-dendritic microstructure was prepared by strain induced melt activation(SIMA)*** effect of compression ratio on the evolution of semisolid microstructure of the experimental alloy was *** results indicate that the average size ofα-Mg grains decreases and spheroidizing tendency becomes more obvious with the compression ratios increasing from 0 to 40%.In addition,the eutectic Mg2Si phase in the Mg−10%Al−1%Zn−1%Si alloy transforms completely from the initial fishbone shape to globular shape by SIMA *** the increasing of compression ratio,the morphology and average size of Mg2Si phases do not change *** morphology modification mechanism of Mg2Si phase in Mg−10%Al−1%Zn−1%Si alloy by SIMA process was also studied.

关键词： Mg−Al−Zn−Si alloy compression ratio microstructure evolution eutectic Mg2Si phase strain induced melt activation(SIMA)process

A Millimeter-Wave Undersampling receiver with Timing Control in 45 nm CMOS-SOI

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A Millimeter-Wave Undersampling Receiver with Timing Control...

Asia-Pacific Conference on Microwave

作者： Yoshiaki Morino Yuki Tsukui Takuma Torii Kazutomi Mori Tomoyuki Furuichi Noriharu Suematsu Akihito Hirai Koji Yamanaka Information Technology R&D Center Mitsubishi Electric Corporation Kamakura Kanagawa Japan Kamakura Engineering Office Mitsubishi Electric Engineering Co. Ltd. Kamakura Kanagawa Japan Research Institute of Electrical Communication Tohoku University Sendai Miyagi Japan

ISBN: (数字)9798350363548

ISBN: (纸本)9798350363555

This paper presents a millimeter-wave undersampling receiver with timing control in 45 nm CMOS-SOI. A direct rF undersampling receiver using an S/H mixer is reported to realize a small area and low power consumption. In this architecture, a timing control circuit is required to synchronize the hold period of the S/H mixer with the sample period of an analog-to-digital converter (AdC). The proposed receiver includes a timing control circuit. The timing control circuit enables control of the relative delay time by selecting each output of a 9-stage delay cell. The deviation of the conversion gain is less than 1 dB by adjusting the delay with the timing control. The fabricated receiver achieves the measured conversion gain of more than 9 dB and the measured EVM with 400 MS/s 64QAM of less than 3.0% in a range from 39 to 53 GHz.

关键词： Millimeter wave circuits Microprocessors receivers Computer architecture Gain measurement Timing delays Synchronization Gain Mixers

Comparison of the corrosion behavior of AM60 Mg alloy with and without self-healing coating in atmospheric environment

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Journal of Magnesium and Alloys 2021年第4期9卷 1224-1237页

作者： Yingwei Song dan Liu Weineng Tang Kaihui dong dayong Shan En-Hou Han Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Baosteel Central Research Institute(R&D Center) China Baowu Group655 Fujin RoadShanghai 201900China

Coatings on the surface of Mg alloys are inevitably damaged during their practical applications,and corrosion can easily initiate from the damaged areas to accelerate the failure of Mg parts.A dual self-healing coating has already been developed to solve this problem in our previous *** the practical application of this coating,it is necessary to investigate its service behavior in atmospheric ***,the corrosion behavior of AM60 Mg substrate with and without the self-healing coating was compared in Shenyang industrial atmospheric *** results show that the enrichment of sediments and rainwater on the scratch areas can accelerate the corrosion of the exposed Mg *** inhibitors can be released from the damaged coating to inhibit *** dual self-healing coating shows better inhibition ability to narrow scratches due to the higher inhibitor concentration and less ***,the coating with wide scratches displays enough inhibition ability as *** dual self-healing coating is a good alternative for Mg alloy parts in the practical applications.

关键词： Self-healing coating Micro-arc oxidation(mao)film Atmospheric corrosion Mg alloy Inhibitor Sediments

SPIrAL dEVELOPMENT APPrOACH FOr dESIGN ANd VALIdATION OF LArGE-SCALE EXTrUSION-BASEd AUTONOMOUS CONSTrUCTION SYSTEMS

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SPIRAL DEVELOPMENT APPROACH FOR DESIGN AND VALIDATION OF LAR...

ASME 2024 International design engineering Technical Conferences and Computers and Information in engineering Conference, IdETC-CIE 2024

作者： Patterson, Albert E. Norris, William r. Soylemezoglu, Ahmet Nottage, dustin Department of Engineering Technology and Industrial Distribution Texas A&M University College StationTX77843 United States J. Mike Walker’66 Department of Mechanical Engineering Texas A&M University College StationTX77843 United States Department of Industrial and Enterprise Systems Engineering University of Illinois at Urbana-Champaign UrbanaIL61801 United States University of Illinois at Urbana-Champaign ChampaignIL61822 United States Construction Engineering Research Lab US Army Corps of Engineers R&D Center ChampaignIL61822 United States

ISBN: (纸本)9780791888391

Autonomous construction systems (ACSs) have become a very important area of research in several domains, particularly in expeditionary site preparation, extraterrestrial exploration and base construction, and disaster response. While these systems range from single vehicles to large systems with swarms of autonomous construction equipment, the major need for development is in the extrusion-based autonomous construction systems (EBACSs). These systems use large 3-d printers and supporting equipment to construct buildings and infrastructure in place. This article reviews a major previous study which developed a quasi-general system architecture for EBACSs and uses this as the starting place for further development in system realizability (manufacturing, assembly, and integration) and verification and validation efforts using the spiral development approach. Originally developed for software development projects, the spiral method has become more and more widely used in recent years for all kinds of risky and complex systems engineering work. Most importantly, decisions are made based on risk and the development/design process ends once the stakeholders decide the magnitude of system improvements in each cycle is too small to justify further cumulative cost. This work clearly shows the need and value of a general system architecture for EBACS and a path forward for their continued development and refinement. The conclusions and recommendations generated are relevant for the design and realization of a variety of different EBACSs configurations (gantry systems, robotic arms, delta robots, ground robot teams, and others) and will aid in the more effective realizability and fielding of these systems throughout their life cycle. Copyright © 2024 by The United States Government.

关键词： Extrusion

revealing the Electrochemical- Mechanical Correspondence between Electrode Films and 20 Ah Prismatic Li-Ion Batteries Via Optical Fiber Monitoring

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SSrN 2024年

作者： Ge, Xiaoyu Zhang, Yi du, rui Chen, Nian Yu, Yifei Li, Zhen Huang, Yunhui State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Camel Group Wuhan Optical Valley R&D Center Co. LTD Wuhan430075 China

revealing the connections and corresponding relationship between the electrodes’ changes and the cell-level strain variation can enhance the accurate estimation of state of charge (SOC), state of health (SOH), cycling life, safety and other key factors of the large capacity prismatic batteries. By utilizing Fiber Bragg grating (FBG) sensors and "Zero-strain" lithium titanate (LTO) electrode, strain behaviors of LiFePO4 (LFP) and graphite electrodes have been directly monitored and further connected to the strain variation of a 20 Ah LFP||Graphite prismatic battery monitored by surface-implanted FBG. Furthermore, we also shown the feasibility for accuratly estimating the SOC and SOH of the battery based on strain profiles, encouraging the utilaztion of FBG strain monitoring in actual engineering filed. © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

Classification of ISAr Images Generated from Model-based Approaches Using deep Learning

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Classification of ISAR Images Generated from Model-based App...

International Conference on Information Networking

作者： Soyoon Park Seonmin Cho Seongwook Lee Taewon Jeong Youngjae Choi Seungeui Lee Youngseok Bae School of Electrical and Electronics Engineering College of ICT Engineering Chung-Ang University Seoul Republic of Korea Institute of Radio Frequency Engineering and Electronics Karlsruhe Institute of Technology Karlsruhe Germany Advanced R&D Center Hanwha Systems Gyeonggi-do Republic of Korea Emerging Science and Technology Directorate Agency for Defense Development Daejeon Republic of Korea

ISBN: (数字)9798331506940

ISBN: (纸本)9798331506957

The classification of small, low-observable airborne targets, such as drones and birds, poses significant challenges due to their low detection rates. Conventional vision sensorbased approaches often suffer from reduced performance in low-visibility environments or adverse weather conditions. Additionally, the integration of infrared sensors alongside camera sensors increases hardware complexity and cost, rendering such solutions inefficient. To address these limitations, we propose a method that leverages deep learning and inverse synthetic aperture radar (ISAr) imaging for accurate target classification, using only radar sensors. Our proposed deep learning-based ISAr image classifier comprises two key components: simulated ISAr image generation and deep learning-based classification. We construct simulated ISAr datasets using point scatter (PS) modeling for quadcopter drones, hexacopter drones, and aircraft, and three-dimension (3d) mesh modeling for birds, unmanned aerial vehicles, and quadcopter drones. The two datasets based on PS and 3d mesh modeling are used to train a proposed deep learning classifier. The proposed classifier can achieve a classification accuracy of $\mathbf{9 8 \%}$ on the PS-based dataset and $\mathbf{9 6 \%}$ on the 3d mesh-based dataset, where scattering was calculated using the physical optics method.

关键词： deep learning Solid modeling Three-dimensional displays Accuracy Atmospheric modeling Physical optics radar imaging Inverse synthetic aperture radar drones Quadrotors

High Performance Lamellar Structured Graphene Oxide Nanocomposite Membranes Via Fe3o4-Coordinated Phytic Acid Control of Interlayer Spacing for Organic Solvent Nanofiltration (Osn)

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SSrN 2024年

作者： Hung, Wei-Song Abebe, Shalligito Habetamu Subrahmanya, T.M. Austria, Hannah Faye M. Nayak, Smrutiranjan Huang, Tsung-Han Setiawan, Owen Hu, Chien-Chieh Lee, Kueir-rarn Lai, Juin-Yih Advanced Membrane Materials Research Center Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei10607 Taiwan R&D Center for Membrane Technology Chung Yuan University Chung-Li32023 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan32023 Taiwan

Graphene oxide (GO), a 2d nanomaterial known for its precise molecular sieving, holds potential for wastewater treatment and Organic Solvent Nanofiltration (OSN). However, challenges such as thin interlayer spacing, extended diffusion pathways, and susceptibility to dehydration and negative charge-induced swelling limit its separation performance. To overcome these limitations, Herein, we have fabricated novel Fe3O4 coordinated PhA intercalated GO nanocomposite membranes. Impressively, these nanocomposite membranes exhibited remarkable separation efficiency for dyes, pesticides, and pharmaceutical ingredients, addressing the drawbacks associated with pristine GO membranes and enhancing their overall performance. The optimum G10(1)/P1.5-F100µL nanocomposite membrane displayed impressive solvent permeance of 40.43, 33.45, 20.70, 16.24, and 5.6 L/m² h bar for acetone, methanol, water, ethanol, and IPA, respectively, while maintaining a rejection rate of ≥98.97% for the MO dye (MW=327.33 g/mol). Furthermore, the membrane exhibited outstanding efficiency in separating tetracycline (TC) in ethanol (≥97.97%) and Pendimethalin (PM) in water (≥99.88%). Additionally, it demonstrated high rejection capabilities for MB (≥97%) and Cr (≥98.78%) in harsh dMF solvent. Importantly, the nanocomposite membrane displayed outstanding durability throughout continuous separation of Pendimethalin (PM) in a water solution over a period of 72 hours. The PM separation remained nearly unchanged for the entire 72-hour duration, demonstrating high mechanical strength and chemical stability. Additionally, the single nanocomposite membrane showcased high efficiency in feed change separation, successfully separating Cr in ethanol and PM in water. These results, compared to the other GO-based nanocomposite membranes, demonstrate the exceptional stability and immense potential for real OSN applications. © 2024, The Authors. All rights reserved.

关键词： Magnetite