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Pulse‑Charging Energy Storage for Triboelectric Nanogenerator Based on Frequency Modulation

Nano-Micro Letters 2025年第9期17卷 139-151页

作者： Kwon‑Hyung Lee Min‑Gyun Kim Woosuk Kang Hyun‑Moon Park Youngmin Cho Jeongsoo Hong Tae‑Hee Kim Seung‑Hyeok Kim Seok‑Kyu Cho donghyeon Kang Sang‑Woo Kim Changshin Jo Sang‑Young Lee Department of Chemical and Biomolecular Engineering Yonsei UniversitySeoul 03722Republic of Korea Ulsan Advanced Energy Technology R&D Center Korea Institute of Energy Research(KIER)Ulsan 44776Republic of Korea Department of Battery Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Research and Development Center Energy-Mining LTDSuwon 16226Republic of Korea Department of Chemical Engineering POSTECHPohang 37673Republic of Korea Department of Battery and Chemical Engineering Hanyang University ERICAGyeonggi 15588Repubilc of Korea UBATT Inc Daejeon 34036Republic of Korea Department of Materials Science and Engineering Yonsei UniversitySeoul 03722Republic of Korea Center for Human‑Oriented Triboelectric Energy Harvesting Yonsei UniversitySeoul 03722Republic of Korea Institute for Convergence Research and Education in Advanced Technology Yonsei UniversitySeoul 03772Republic of Korea Department of Battery Engineering Yonsei University50Yonsei‑RoSeodaemun‑GuSeoul 03722Republic of Korea

Energy harvesting storage hybrid devices have garnered considerable attention as self-rechargeable power sources for wireless and ubiquitous *** nanogenerators(TENGs),a common type of energy harvester,generate alternating current-based,irregular short pulses,posing a challenge for storing the generated electrical energy in energy storage systems that typically operate with direct current(dC)-based low-frequency *** this study,we propose a new strategy that leverages high-frequency response to develop efficient chargeable TENG-supercapacitor(SC)hybrid devices.A highfrequency SC was fabricated using hollow-structured MXene electrode materials,resulting in a twofold increase in the charging efficiency of the hybrid device compared to a control SC made with conventional carbon electrode *** a systematic understanding,the electrochemical interplay between the TENGs and SCs was investigated as a function of the frequency characteristics of SCs(f_(SC))and the output pulse duration of TENGs(Δt_(TENG)).Increasing the fSC·Δt_(TENG) enhanced the charging efficiency of the TENG-SC hybrid *** study highlights the importance of frequency response design in developing efficient chargeable TENG-SC hybrid devices.

关键词： Energy harvesting storage hybrids Triboelectric nanogenerators Supercapacitors Frequency response MXene

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Comprehensive Study on the Slat Noise of 30P30N High-Lift Airfoil Basd on High-Order Wall-resolved Large-Eddy Simulation

arXiv

引用

arXiv 2024年

作者： Zhang, Keli Lin, Shizhi Liu, Peiqing Liu, Shihao Liu, Kai Beihang University Beijing100191 China Rankyee Technology Beijing Beijing100097 China School of Aeronautic Science and Engineering China Solver R&D and Development Center CTO

This study presents wall-resolved large-eddy simulations (WrLES) of a high-lift airfoil, based on high-order flux reconstruction (Fr) commercial software dimaxer, which runs on consumer level GPUs. A series of independence tests are conducted, including various Ffowcs Williams-Hawkings sampling surfaces, different mesh densities, simulations at 4tℎ and 5tℎ order accuracies, and varying spanwise lengths, to establish best practice for predicting slat noise through high-order WrLES. The results show excellent agreement with experimental data while requiring significantly fewer computational resources than traditional second-order methods. An investigation on the effects of reynolds number (re) is performed by scaling the airfoil size, with reynolds numbers ranging from 8.55 × 105 to a real aircraft level of 1.71 × 107. By applying simple scaling through Strouhal number (St), spanwise correction, and distance from the receiver, the far-field noise spectra for different reynolds numbers can be coincided. Additionally, simulations are performed at four angles of attack: 3◦, 5.5◦, 9.5◦, and 14◦. The results indicate that higher angles of attack lead to a less intense feedback loop, resulting in lower tonal noise frequencies and reduced noise amplitude. The maximum noise reduction observed is over 14dB when comparing 14◦ to 3◦. Furthermore, an improved formula is proposed to enhance the prediction of slat noise tonal frequencies and to better elucidate the mechanism behind tonal noise generation. Copyright © 2024, The Authors. All rights reserved.

关键词： reynolds number

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A Novel O2/N2 Plasma Photoresist Ashing Process with High Stripping rate and Uniformity under radio Frequency Bias Voltage

A Novel O2/N2 Plasma Photoresist Ashing Process with High St...

引用

International Conference on (ICEPT) Electronic Packaging technology

作者： Jianwei Xian Huiqian Zhou Minbo Zhou Xinping Zhang Guangdong Provincial Engineering Technology R&D Center of Electronic Packaging Materials & Reliability and School of Materials Science & Engineering South China University of Technology Guangzhou China Dongguan SINDIN Precision Instrument Co. Ltd. Dongguan China

ISBN: (数字)9798350353808

ISBN: (纸本)9798350353815

The development of wafer-level packaging (WLP) technique relies heavily on the preparation of large-area redistribution layers (rdL). One crucial step in rdL fabrication is photoresist stripping, as the quality of this process affects greatly the integrity of rdL lines and the reliability of the packaging. In this study, the effects of two different plasma sources, radio-frequency (rF) inductively coupled plasma (ICP) and microwave (MW) remote plasma, on the removal of photoresist over large areas on eight-inch wafers were systematically investigated. Using the Taguchi method, the quality response characteristics of various equipment parameters (frequency, temperature, power, gas flow rate and gas composition) on the stripping rate and stripping uniformity were evaluated. Additionally, a single-factor level analysis of each equipment parameter was conducted to delve deeper into the influential trends of each factor on the ashing process. The results indicate that the major factors influencing the stripping rate are ionization frequency and temperature, whereas ionization frequency and O 2 concentration in mixed O 2 /N 2 plasma predominantly affect the stripping uniformity. The stripping rate significantly increases with raising temperature and power. Additionally, the presence of a small amount of N 2 in the O 2 /N 2 plasma brings about increase in the stripping rate, although pure oxygen plasma is preferable for achieving lower uniformity. By setting rF bias in the MW remote plasma, the stripping rate is increased from below 100 Å/min to over 250 Å/min, while maintaining the uniformity below 20%.

关键词： radio frequency Temperature Ionization resists Fluid flow Etching Plasmas

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Mechanical Properties and residual Stress Analysis of OdS Ni Superalloy fabricated by Laser Powder Bed Fusion Process

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Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 2025年 72卷 S453-S456页

作者： Lee, dong Wan Lee, Su Gwan dhin Van, Cong Kim, Cae ryeong Kim, Jin Chun Kim, Hwi Jun Lim, Joong Gyeong Yoon, Tae Sik School of Materials Science and Engineering University of Ulsan Ulsan Korea Republic of Liquid processing and casting technology R&D division Korea Institute of Industrial Technology Incheon Korea Republic of Research Laboratories DaiShinKangup Co.Ltd Ulsan Korea Republic of

Oxide dispersion Strengthened (OdS) superalloys are high-temperature alloys with enhanced mechanical properties at elevated temperatures. This is achieved by precipitating thermally stable fine oxides (such as Y2O3, ThO2) or carbides within the metal matrix1). These alloys are primarily used in the field of superalloys and recently, the principle has been applied to various metals, including aluminum and copper alloys. The OdS superalloys are generally manufactured by methods such as Hot Isostatic Pressing (HIP) and Spark Plasma Sintering (SPS) after mechanical alloy. These alloys have high strength, making it difficult to process complex shapes, and research on AM technology is being conducted as an alternative manufacturing method. In this study, the experiment was conducted with a Laser Powder bed fusion process using metal powder materials. In this research, the OdS Ni-superalloy powder similar to the composition of MA6000 was manufactured using a gas atomization process. A specimen of the produced OdS Ni-superalloy powder was prepared by an L-PBF process. We measured changes in densification behavior of specimens according to L-PBF process parameters and conducted residual stress measurements in order to identify issues arising during the processing steps. Additionally, we analyzed the powder and PBFed specimens of OdS Ni-Super alloy using optical microscopy, scanning electron microscopy, Xrd, and LPS analysis. © 2025 Japan Society of Powder and Powder Metallurgy.

关键词： Hot isostatic pressing

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Efficient drilling technology of Horizontal Wells in the duverney Block in Canada

Efficient Drilling Technology of Horizontal Wells in the Duv...

引用

2021 Abu dhabi International Petroleum Exhibition and Conference, AdIP 2021

作者： Han, Haochen Yang, Guobin Zhang, Guobin Chen, Jia Chen, Peter Fu, Jin Wang, Siqi CNPC Engineering and Technology R&D Company CNPC Materials Procurement Center CNPC GreatWall Drilling Company Ltd.

ISBN: (纸本)9781613998342

recent years, both exploration and development have made considerable progress in the duverney block shale gas in Canada. However, technical problems exposed in horizontal drilling engineering need to be optimized: 1) Loss is common in shallow formations;2) High downhole friction torque, low rOP and drilling cuttings accumulation in long horizontal well section;3) Borehole instability leads to hanger or packer failure;4) drill bits and PdM have short servicing life and low efficiency. Optimization comes from three aspects: (1) Based on previous drilling experience and latest formation condition and development requirement, we design a new well profile for the block taking into drilling safety and further development account;(2) Optimize strong inhibitive, easy-maintenance and high cutting-carrying capacity OBM to ensure the safety requirements in the ultra-long open hole section;(3) BHA and parameters optimization. Optimize drill bit with high-abrasiveness and axial efficiency according to logging data, drillability and UCS. Upgrade conventional PdM into high-performance PdM with even-wall thickness. By means of simulation and calculation, drilling parameters suitable for duverney block has been optimized. Based on the optimization above, a stable and efficient well profile has been improved solving hanger failure on-site efficiently and complete with composite casing design (4-1/2 inch plus 5 inch) in reservoir section;a 90/10 oil-water ratio OBM has been optimized and applied onsite;Combined with high performance PdC bit and even-wall PdM as well as optimized drilling parameters, higher rOP and longer horizontal section have been achieved. The optimization has made successful field application results:(1) Completion depth has been deepened gradually, from 18,080 ft in 2013 to 23,208 ft at present, with an increase of 28.3%;(2) Horizontal section length has been increasing dramatically, from 6,190 ft in 2013 to 10,301 ft at present, with an increase of 66.4%;(3) Th

关键词： Horizontal wells

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Effect of Welding Speed on Microstructural Evolution and Strengthening Mechanism of Friction-Stir Welded 7075 Aluminum

SSRN

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SSrN 2024年

作者： Kim, Jong-Hun Choi, Hyo-Nam Lee, Kwang-Jin Shin, Jae-Hyuck Seo, Nam-Hyuk Jung, Jae-Gil Lee, Seok-Jae Lee, Seung-Joon Gyeonggi-do Siheung-si15073 Korea Republic of Carbon & Light Materials Application R&D Group Korea Institute of Industrial Technology Jeollabuk-do Jeonju-Si54666 Korea Republic of Advanced Materials R&D Department Korea Automotive Technology Institute Chungcheongnam-do Cheonan-Si31214 Korea Republic of Division of Advanced Materials Engineering Jeonbuk National University Jeollabuk-do Jeonju-Si54896 Korea Republic of

In present study, we aim to analyze the microstructural characteristics and strengthening mechanism of AA7075-T6 alloy after the friction-stir welding speeds from 150 to 350 mm min-1. The continuous dynamic recrystallization underwent actively with faster speed, leading to equiaxial and fine grains of 350 specimen, as evidenced by misorientation distribution, grain orientation spread, and aspect ratio. regarding the textural evolution, the 150 specimen retained the deformation texture (e.g., Brass), while the 350 specimen showed the development of recrystallization texture (e.g., Goss). The 250 specimen revealed superior weldability for strength of over ~80% owing to both grain refinement and accumulated dislocations despite the dissolution of precipitates (e.g., GP II zone and ηˊ). © 2024, The Authors. All rights reserved.

关键词： Textures

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Novel Gender and Age Prediction from real Time Facial Images using Linear regression Algorithm 8

Novel Gender and Age Prediction from Real Time Facial Images...

引用

8th International Conference on Electronics, Communication and Aerospace technology, ICECA 2024

作者： Nalini, N. Shahila, d. Ferlin deva rosi, A. Tamilselvi, M. Giri, Jayant Sherideh, Ala'a Al Vel Tech Rangarajan Dr.Sagunthala R&d Institute of Science and Technology Department of Ece Chennai India Saveetha University Saveetha School of Engineering Department of Ece Chennai India Yeshwantrao Chavan College of Engineering Department of Mechanical Engineering Nagpur India Lovely Professional University Division of Research and Development Phagwara India Zarqa University College of Information Technology Department of Cyber Security zarqa Jordan University of Business and Technology Jeddah Saudi Arabia

ISBN: (纸本)9798350367904

The proposed novel algorithm utilizes linear regression in real-time facial image analysis for predicting both gender and age. By leveraging features extracted from facial data, the model aims to provide accurate and instantaneous predictions. The emergence of social media platforms has made the automatic classification of gender and age increasingly relevant. real-time frame processing is possible with OpenCV. The expected gender and age are provided as the output, and this frame is provided as the input. The capacity to autonomously ascertain age and gender from facial images because of its versatility in facial analysis applications. However, the current models are still behind the required accuracy level, which is required for these models to be used in real-world applications, because of the significant intraclass variance of face images (such as difference in lighting, position, scale, and occlusion). In this work, a deep learning framework uses an ensemble of residual and attentional convolutional networks to reliably determine the gender and age group of facial photographs. By employing an attention mechanism, this model can concentrate on the important and instructive aspects of the face, increasing its prediction accuracy to 90.15%. © 2024 IEEE.

关键词： Prediction models

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The Effect of V Content on the Phase Formation Behavior in VC Based Tool Steel Fabricated Through Powder Metallurgy

SSRN

引用

SSrN 2023年

作者： Park, Sung-Min Kim, dae Ha Jun, Tea-Sung Kim, Nam-Seok Park, Chang-Soo Park, Kwangsuk Kim, dong Hoe Park, Hyung-Ki Im, Hyeon-Tae Functional Materials and Components R&D Group Korea Institute of Industrial Technology Gangneung25440 Korea Republic of Department of Materials Science and Engineering Korea University Seoul02841 Korea Republic of R&D Center KONASOL Daedeok-Gu Daejeon34302 Korea Republic of Department of Mechanical Engineering Incheon National University Incheon22012 Korea Republic of Industrial Materials Processing R&D Department Korea Institute of Industrial Technology Incheon21999 Korea Republic of

This study investigated changes in the hardness and phase formation behavior following the vanadium (V) content in vanadium carbide (VC)-based tool steel. The V contents in VC-based tool steels were set to 9.0 and 11.5 wt%, and other compositions were the same. The two samples were prepared as powders through vacuum induction inert melting gas atomization and then as bulk samples through hot isostatic pressing. For the heat treatment, the bulk samples were annealed at 1070 °C and then quenched. The hardness of the samples with the V content of 9.0 and 11.5 wt% was 50.7 and 17.3 HrC, respectively, and the 11.5 wt%V sample had a lower hardness value. The phases in the two samples were analyzed to determine the reason for the difference in hardness. From the analyses, the α`-martensite phase was formed in the matrix of the 9.0 wt%V sample, whereas the matrix of the 11.5 wt%V sample was the α-ferrite phase. Thermodynamic calculations and high-temperature phase analysis were performed to examine the changes in the phase formation. In the 9.0 wt%V sample, the γ-austenite phase was formed at high temperature and transformed to the α`-martensite phase during cooling in the heat treatment process. Meanwhile, the 11.5 wt%V sample had no austenite phase at high temperatures, so martensitic transformation did not occur. These analyses confirmed that it is crucial to control the phase formation behavior by controlling the contents of V and C with an appropriate ratio in securing a high hardness in VC-based tool steel. © 2023, The Authors. All rights reserved.

关键词： Tool steel

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The Effect of Plasma Surface Activation Treatment on Capillary Flow Wettability of the Underfill Adhesive in the Standoff Gap of Si/Underfill/Si Bonded Structure in 3d ICs

The Effect of Plasma Surface Activation Treatment on Capilla...

引用

International Conference on (ICEPT) Electronic Packaging technology

作者： Huiqian Zhou Jianwei Xian Guangchao Lyu Minbo Zhou Xinping Zhang Guangdong Provincial Engineering Technology R&D Center of Electronic Packaging Materials & Reliability School of Materials Science & Engineering South China University of Technology Guangzhou China Dongguan SINDIN Precision Instrument Co. Ltd. Dongguan China

ISBN: (数字)9798350353808

ISBN: (纸本)9798350353815

The activation effects of mixed 02/ Ar plasma on the underfill capillary flow wettability in 100 µm sub-gap layers using radio-frequency capacitively coupled plasma (rF CCP) and microwave electron cyclotron resonance plasma (MW ECr) are systematically investigated in this study. To mimic the die/underfill/substrate structure in actual 2.5d/3d integrated packaging, the Si/underfill/Si adhesion structure is designed. results demonstrate that as the proportion of O2 in mixed 02/ Ar plasma increases, the surface energy at the substrate center rises steadily. Moreover, the enhancement of surface energy is greater using MW ECr than rF CCP, enabling rapid wetting and dispensing of underfill on both die and substrate layers. Surface energy components measurements reveal that the contribution of mixed 02/ Ar plasma to the surface energy of substrate is primarily due to an increase in the polar component. Analysis results of X-ray photoelectron spectroscopy (XPS) surface chemical compositions of the substrate center after plasma treatment show a decrease in the carbon contamination peak and the generation of specific polar functional groups (C=O, O-C=O, Si-OH). Subsequent underfill dispensing and curing after plasma activation treatment result in reduced delamination in the Si/underfill/Si structure, along with a decrease in porosity. This comprehensive characterization of plasma surface activation treatment brings a better understanding of plasma modification, plasma equipment, and the enhancement of reliability in advanced packaging.

关键词： radio frequency Three-dimensional displays Surface discharges Surface contamination Packaging Silicon Cleaning

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Large-Scale Cu Interconnection of Organic Substrate materials Through Electroless Plating technology

Large-Scale Cu Interconnection of Organic Substrate Material...

引用

International Conference on Electronics Packaging (ICEP)

作者： M. L. Shih P. S. Shih J. H. Huang I. A. Chen J. S. Wang C. T. Ko B. r. Lin K. M. Yang C. H. Lin A. S. Lee C. r. Kao Department of Materials Science and Engineering National Taiwan University Taipei Taiwan R.O.C. Product Characterization Corporate R&D Unimicron Technology Corporation Group Hsinchu City Taiwan

ISBN: (数字)9784991191176

ISBN: (纸本)9798350385908

With the growing demand for high performance applications in semiconductor industry, direct Cu-to-Cu bonding has become the major trajectory for next generation IC packaging. However, even though the TSV-less packaging platform used in 2.3d integration is considered competitive for serving as alternative for 2.5d type package of Si interposer, the package warpage during high temperature bonding process by the CTE (coefficient of thermal expansion) mismatch between organic substrate and molded interposer chip of Si-based devices is still one of the major concern when packaging dimension become larger due to an increase of die size and the number of die mounted. Therefore, in this study, the feasibility of large size Cu interconnection achieved by microfluidic electroless interconnection (MELI) process under low temperature and without external pressure will be demonstrated on organic BT substrate materials where the mechanism behind flow parameters during the MELI process reaction will be further investigated. Also, the mechanical shear test for the reliability of Cu pillar joints were conducted, and it shows a phenomenal bonding strength of nearly 72 MPa comparable to commercial Sn-based solder joint.

关键词： Thermal expansion Integrated circuit interconnections Plating Packaging Trajectory Copper Bonding

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