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Quenched PVDF/PMMA Porous Matrix for Triboelectric Energy Harvesting and Sensing

Energy & Environmental Materials 2025年第1期8卷 225-234页

作者： Assem Mubarak Bayandy Sarsembayev Yerzhigit Serik Abdirakhman Onabek Zhanat Kappassov Zhumabay Bakenov Kazuyoshi Tsuchiya Gulnur Kalimuldina Department of Mechanical and Aerospace Engineering School of Engineering and Digital SciencesNazarbayev UniversityKabanbay Batyr Ave.53Astana 010000Kazakhstan Institute of Smart Systems and Artificial Intelligence Nazarbayev UniversityKabanbay Batyr Ave.53Astana 010000Kazakhstan Department of Robotics Engineering School of Engineering and Digital SciencesNazarbayev UniversityKabanbay Batyr Ave.53Astana 010000Kazakhstan Department of Chemical and Materials Engineering School of Engineering and Digital SciencesNazarbayev UniversityKabanbay Batyr Ave.53Astana 010000Kazakhstan Micro/Nano Technology Center Tokai University4-1-1 KitakanameHiratsukaKanagawa 259-1292Japan

The rapid development of nanotechnology has significantly revolutionized wearable electronics and expanded their *** introducing innovative solutions for energy harvesting and autonomous sensing,this research presents a cost-effective strategy to enhance the performance of triboelectric nanogenerators(TENGs).The TENG was fabricated from polyvinylidene fluoride(PVDF)and N,N'-poly(methyl methacrylate)(PMMA)blend with a porous structure via a novel optimized quenching *** developed approach results in a highβ-phase content(85.7%)PVDF/3wt.%PMMA porous blend,known for its superior piezoelectric ***/3wt.%PMMA modified porous TENG demonstrates remarkable electrical output,with a dielectric constant of 40 and an open-circuit voltage of approximately 600 *** porous matrix notably increases durability,enduring over 36000 operational cycles without performance ***,practical applications were explored in this research,including powering LEDs and pacemakers with a maximum power output of 750mWm^(-2).Also,TENG served as a self-powered tactile sensor for robotic applications in various temperature *** work highlights the potential of the PVDF/PMMA porous blend to utilize the next-generation self-powered sensors and power small electronic devices.

关键词： N N0-poly(methyl methacrylate)(PMMA) robotic tactile sensors polyvinylidene fluoride(PVDF) quenching triboelectric nanogenerators(TENGs)

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Selective Privacy Control on Video Feed Using Pre-Trained DNN

Selective Privacy Control on Video Feed Using Pre-Trained DN...

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2024 IEEE International Conference on Intelligent Signal Processing and Effective Communication Technologies, INSPECT 2024

作者： Ghosh, Anupam Mukherjee, Sayan Khan, Shamir Singh, Swarit Anand Boby, Riby Abraham Indian Institute of Technology Jodhpur Inter-disciplinary Research Platform - Robotics and Mobility Systems Department of Mechanical Engineering Rajasthan Jodhpur342030 India

ISBN: (纸本)9798350379525

This article introduces an approach to provide privacy control on live video feeds using a pretrained D NN model. Due to privacy being a major concern in today's world, this approach would ensure the blurring of the faces in live feeds on a real-time basis to protect the privacy of participants. Users are also provided with the liberty to selectively blur/unblur the face of any specific participants as required, thereby providing enhanced flexibility and control over privacy settings during live video conferences or communications. The proposed approach also lets users upload a picture of someone. This ensures that the person's identity stays unobfuscated in the video stream. This feature comes in handy when some people are required to be seen, for example, in work meetings and online conferences. The developed solution can blur faces in real time and let users unblur or keep certain faces clear. This gives users a complete set of tools to handle privacy concerns. It tackles the growing concerns about facial privacy in our digital world. This solution enhances privacy during live video calls by utilizing advanced computer vision to selectively blur unwanted faces while maintaining clear visibility of intended participants. © 2024 IEEE.

关键词： Differential privacy

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Boron-based hydrogen storage materials for highly selective conversion to liquid organic hydrogen carriers synthesis focus on formic acid

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International Journal of Hydrogen Energy 2025年 143卷 958-968页

作者： Ülgen, Berfin Ekin Coşkuner Filiz, Bilge Açıkalın, Korkut Civelek Yörüklü, Hülya Kantürk Figen, Aysel Department of Chemical Engineering Yildiz Technical University İstanbul Turkey Department of Metallurgy and Materials Engineering Yildiz Technical University İstanbul Turkey Department of Energy Systems Engineering Yalova University Yalova Turkey Department of Environmental Engineering Yildiz Technical University İstanbul Turkey Clean Energy Technologies Institute Yildiz Technical University İstanbul Turkey

Recent progress in synthesizing liquid organic hydrogen carriers (LOHCs) using conversion technology has shown that boron-based materials have significant potential as hydrogen storage materials. Here, we present the production of LOHCs, focused on formic acid (HCOOH) through conversion methodology. To achieve this objective, we directly supply hydrogen from boron-based materials (sodium borohydride-NaBH4, potassium borohydride-KBH4, and ammonia borane-NH3BH3) in the reaction medium for LOHCs sythesis. We carefully examined how reaction parameters (such as pH, temperature, and flow rate) affect the efficiency (E, %) of boron-based hydrogen storage materials using Central Composite Design (CCD). We found that the optimal conversion conditions were 50 °C, 0.7 M NaBH4, and 60 mL/min gas flow, resulting in a maximum E (87%). The results demonstrate the production of HCOOH with excellent product selectivity (PS,>94%) using NaBH4 as a hydrogen source. © 2024 Hydrogen Energy Publications LLC

关键词： Hydrogenation

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Observer-based stabilization for discrete nonlinear semi-Markov jump singularly perturbed models with mode-switching delay

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Science China(Information Sciences) 2025年第4期68卷 389-390页

作者： Wenhai QI Runkun LI Ju H.PARK Zheng-Guang WU Huaicheng YAN School of Engineering Qufu Normal University Department of Electrical Engineering Yeungnam University Institute of Cyber-Systems and Control Zhejiang University Key Laboratory of Smart Manufacturing in Energy Chemical Process of Ministry of Education East China University of Science and Technology

Semi-Markov jump systems(S-MJMs) not only characterize hybrid systems but also address the limitations of Markov jump systems(MJMs) [1–3]. Due to their ability to exhibit multi-time-scale features, singularly perturbed models(SPMs) effectively model practical systems influenced by multiple time-scale phenomena [4]. In this study, the observer-based output feedback controller is asynchronous with the original system due to the time delay in the controller mode switching. A nonlinear plant with singularly perturbed parameters(SPPs) is represented using an interval type-2(IT2) fuzzy model [5].

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Understanding the Thermal Impedance of Silicone Rubber/Hexagonal Boron Nitride Composites as Thermal Interface Materials

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Chinese Journal of Polymer Science 2024年第3期42卷 352-363,I0008页

作者： Yuan Ji Shi-Da Han Hong Wu Shao-Yun Guo Feng-Shun Zhang Jian-Hui Qiu The State Key Laboratory of Polymer Materials Engineering Sichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing TechnologyPolymer Research InstituteSichuan UniversityChengdu 610065China Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900China Department of Mechanical Engineering Faculty of Systems Science and TechnologyAkita Prefectural UniversityAkita 015-0055Japan

Silicone rubber(SR) composites are most widely used as thermal interface materials(TIMs) for electronics heat dissipation. Thermal impedance as the main bottleneck limiting the performance of TIMs is usually neglected. Herein, the thermal impedance of SR composites loaded with different levels of hexagonal boron nitride(h-BN) as TIMs was elaborated for the first time by the ASTM D 5470 standard test and finite element analysis. It was found that elastic modulus and surface roughness of SR composites increased with the increase of h-BN content, indicating that the conformity was reduced. When the assembly pressure was 0.69 MPa, there existed an optimal h-BN content at which the contact resistance was minimum(0.39 K·cm^(2)·W^(-1)). Although the decreased bond line thickness(BLT) by increasing the assembly pressure was beneficial to reduce the thermal impedance, the proper assembly pressure should be selected to prevent the warpage of the contact surfaces and the increase in contact resistance, according to the compression properties of the SR composites. This study provides valuable insights into fabrication of high-performance TIMs for modern electronic device applications.

关键词： Thermal interface materials Hexagonal boron nitride Thermal impedance Surfaces

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Continuous flow pyrolysis of virgin and waste polyolefins:a comparative study,process optimization and product characterization

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Frontiers of chemical Science and engineering 2024年第6期18卷 133-149页

作者： Ecrin Ekici Güray Yildiz Magdalena Joka Yildiz Monika Kalinowska ErolŞeker Jiawei Wang Karlsruhe Institute of Technology Institute of Catalysis Research and TechnologyEggenstein-Leopoldshafen 76344Germany Izmir Institute of Technology Faculty of EngineeringDepartment of Energy Systems EngineeringIzmir 35430Türkiye Department of Materials Engineering and Production Faculty of Mechanical EngineeringBialystok University of TechnologyBialystok 15-351Poland Department of Agricultural and Food Engineering and Environmental Development Institute of Civil Engineering and EnergeticsFaculty of Civil Engineering and Environmental SciencesBialystok University of Technology15-351 BialystokPoland Department of Chemistry Biology and BiotechnologyInstitute of Civil Engineering and EnergeticsFaculty of Civil Engineering and Environmental SciencesBialystok University of TechnologyBialystok 15-351Poland Izmir Institute of Technology Faculty of EngineeringDepartment of Chemical EngineeringIzmir 35430Türkiye Energy and Bioproducts Research Institute(EBRI) Aston UniversityBirmingham B47ETUnited Kingdom

Under optimal process conditions,pyrolysis of polyolefins can yield ca.90 wt%of liquid product,i.e.,combination of light oil fraction and heavier *** this work,the experimental findings reported in a selected group of publications concerning the non-catalytic pyrolysis of polyolefins were collected,reviewed,and compared with the ones obtained in a continuously operated bench-scale pyrolysis *** process parameters were used for the pyrolysis of waste and virgin counterparts of high-density polyethylene,low-density polyethylene,polypropylene and a defined mixture of those(i.e.,25:25:50 wt%,respectively).To mitigate temperature drops and enhance heat transfer,an increased feed intake is employed to create a hot melt plastic *** 1.5 g·min^(-1) feed intake,1.1 L·min^(-1) nitrogen flow rate,and a moderate pyrolysis temperature of 450℃,the formation of light hydrocarbons was favored,while wax formation was limited for polypropylene-rich *** of virgin plastics yielded more liquid(maximum 73.3 wt%)than that of waste plastics(maximum 66 wt%).Blending polyethylenes with polypropylene favored the production of liquids and increased the formation of gasoline-range *** products were mainly composed of C3 hydrocarbons,and no hydrogen production was detected due to moderate pyrolysis temperature.

关键词： waste plastics polyolefins chemical recycling pyrolysis alternative fuels waste-to-energy

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Nanoimprint lithography-assisted block copolymer self-assembly for hyperfine fabrication of magnetic patterns based on L10-FePt nanoparticles

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Science China Chemistry 2025年第5期68卷 2027-2034页

作者： Jie Zhang Yi Chen Guijun Li Zelin Sun Zhengong Meng Wai-Yeung Wong Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic University The Hong Kong Polytechnic University Shenzhen Research Institute Division of Integrative Systems and Design and Department of Electronic and Computer EngineeringThe Hong Kong University of Science and Technology School of Flexible Electronics (Future Technology) and Institute of Advanced Materials (IAM) Nanjing Tech University

L10-FePt-type bit-patterned media has provided a promising alternative for ultrahigh-density magnetic recording systems in the current digital era, but rapid fabrication of magnetic patterns with hyperfine bit islands is still challenging, especially with the target for miniaturization and scalable production simultaneously. Herein, Fe,Pt-containing block copolymers were utilized as single-source precursors for solution-processable patterning and subsequent generation of the demanding magnetic FePt dots by in situ pyrolysis. High-throughput nanoimprint lithography was initially employed to fabricate the predefined bit cells precisely,and then the intrinsic self-assembly of phase-separated block copolymers further drove the formation of accurate bit *** from the synergistic effect of top-down lithographic approach and bottom-up self-assembly, the customizable patterns could be achieved for large-scale mass production in targeted areas, but high-density isolated dots could also be accurately aligned along the patterned features after subsequent self-assembly. This reliable strategy would provide a good avenue to precisely construct ultrahigh-density magnetic data storage devices.

关键词： organometallic precursor magnetic nanoparticles block copolymer self-assembly nanoimprint lithography

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An Adaptive Superposition Point Process Model with Neuronal Encoding Engagement Identification 46

An Adaptive Superposition Point Process Model with Neuronal ...

引用

46th Annual International Conference of the IEEE engineering in Medicine and Biology Society, EMBC 2024

作者： Li, Mingdong Wang, Mingyi Wang, Yiwen Robotics and Autonomous Systems Thrust Hkust Guangzhou China Hkust Hong Kong Department of Chemical and Biological Engineering Hkust Hong Kong Department of Electronic and Computer Engineering Hkust Hong Kong Hkust Guangzhou China

ISBN: (纸本)9798350371499

Neuronal encoding is realized by modulating firing rates in response to various encoding factors, including external stimuli, behaviors, and complex neural interactions. The neuronal encoding engagement of various factors are dynamic, which reflects how neurons aggregate different information. The process of uncovering the extent to which these factors contribute to neuronal encoding over time is neuronal encoding engagement identification. Brain-machine interface (BMI) establishes a closed-loop framework to investigate how neurons response to different encoding factors. Since neurons don't fully participate in encoding one specific factor, accurate encoding engagement identification contributes to leveraging encoding and decoding in more naturalistic BMI application scenarios. However, previous works focus on modeling and estimating tuning properties instead of analyzing the neuronal information aggregation. We develop a dual adaptive superposition point process filter (DASPPF), which explicitly incorporates various encoding factors. DASPPF not only enables decoding kinematics but also identifies the engagement of individual kinematics encoding and functional neural connectivity encoding. DASPPF is validated on numerical simulations of monkey circle-tracking tasks. The proposed method can effectively promote decoding performance and uncover how neurons engage themselves in different effects with point process observation, which may help enhance the development of neurotechnologies. © 2024 IEEE.

关键词： Decoding

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Vertical velocity of a small sphere in a sheared granular bed

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Physical Review Research 2024年第2期6卷 L022015-L022015页

作者： Song Gao (高颂) Julio M. Ottino Richard M. Lueptow Paul B. Umbanhowar Department of Mechanical Engineering Northwestern University Evanston Illinois 60208 USA Department of Chemical and Biological Engineering Northwestern University Evanston Illinois 60208 USA Northwestern Institute on Complex Systems (NICO) Northwestern University Evanston Illinois 60208 USA

Small particles fall through sheared beds of larger particles in settings ranging from geophysics to industry, but the study of large-to-small size ratios R, spanning the trapping threshold Rt, has been neglected. In simulations of noncohesive spheres for RRt, vp is constant at low γ̇, but again decreases at high γ̇. We model these behaviors and discuss analogies with electron transport in solids.

关键词： Granular flows Granular segregation Granular materials

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Study on the effect of cathode purge strategy on oxygen utilization of a proton exchange membrane fuel cell using oxygen

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International Journal of Hydrogen Energy 2025年 141卷 487-498页

作者： Do, Tan-Thich Devi, Nitika Arpornwichanop, Amornchai Chen, Yong-Song Advanced Institute of Manufacturing with High-tech Innovations and Department of Mechanical Engineering National Chung Cheng University 168 University Rd. Minhsiung Township Chiayi621301 Taiwan Center of Excellence in Process and Energy Systems Engineering Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand

Hydrogen-oxygen proton exchange membrane fuel cells (HO-PEMFCs) have the advantages of high energy density, quick startup, low emissions, and low noise during operation Therefore, it is suitable to serve as a power source for unmanned underwater vehicles (UUVs). The operating duration of the HO-PEMFC depends on the utilization of both hydrogen and oxygen. When operating in an environment lacking atmospheric oxygen, oxygen utilization is as important as hydrogen utilization. Therefore, it is necessary to study the effect of oxygen management strategies on oxygen utilization. This study develops a model to examine water accumulation within the cathode and experimentally investigates an HO-PEMFC under various purge operations with a dead-end cathode mode. Results show that the highest oxygen utilizations are achieved at 13.0, 11.2, and 9.4 kJ L−1 for operating current densities of 100, 400, and 800 mA cm−2, respectively, with a purge duration of 0.1 s and optimal purge intervals of 300, 110, and 35 s. Additionally, the optimal cathode purge strategy is proposed based on the ratio of purged gas volume to cathode volume, with the suggested ratio being approximately 15.7%. © 2024 Hydrogen Energy Publications LLC

关键词： Unmanned underwater vehicles

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