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2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio science Meeting, AP-S/URSI 2022

作者： Dong, Ming Chen, Liang Bagci, Hakan Computer Electrical and Mathematical Science and Engineering Division Electrical and Computer Engineering Program Thuwal23955-6900 Saudi Arabia

ISBN: (数字)9781665496582

ISBN: (纸本)9781665496582

A time domain discontinuous Galerkin (DGTD)-based framework is developed to analyze three-dimensional organic electrochemical transistors (OECTs). The proposed framework uses a local DG scheme to discretize the (non-linearly) coupled system of the Poisson equation (in electric potential) and the drift-diffusion (DD) equations (in charge densities) in space. To reduce the computational requirements, a dual-mesh scheme, which uses a dense mesh for the DD equations and a much coarser mesh for the Poisson equation, is used. Furthermore, an implicit-explicit time integration scheme, which allows for a significantly larger time-step size, is utilized to efficiently account for the extremely long response time of OECTs. Numerical results are provided to demonstrate the applicability and accuracy of the proposed solver. © 2022 IEEE.

关键词： Poisson equation

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Thermal Simulation for Magnetic Coupler of Wireless Power Transfer Electric Vehicles by Using Heat Sink and Thermoelectric Cooler

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Progress In Electromagnetics Research M 2024年 126卷 89-98页

作者： Farooq, Umar Shafique, Shahryar Asif, Muhammad Arslan, Muhammad Wongjom, Poramed Ullah, Rizwan Zhilenkov, Anton Mobayen, Saleh Pijitrojana, Wanchai Electrical and Computer Engineering Department Thammasat School of Engineering Thammasat University Rangsit Campus Klong Luang Pathum Thani 12120 Thailand Ministry of IT & Telecommunications Islamabad Pakistan Department of Electrical Engineering University of Science and Technology Main Campus Bannu23200 Pakistan Department of Mechanical Engineering University of Engineering and Technology Lahore Pakistan Division of Physics Faculty of Science and Technology Thammasat University Rangsit Campus Klongluang Pathum Thani 12120 Thailand Department of Electrical Engineering Chulalongkorn University Bangkok10330 Thailand Department of Cyber-Physical Systems St. Petersburg State Marine Technical University Saint-Petersburg190121 Russia Graduate School of Intelligent Data Science National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou640301 Taiwan

In challenging operational environments such as underground buildings beneath roadways, reliability and performance of wireless power transfer (WPT) systems for electric vehicles (EVs) heavily hinge on the operating temperature of the magnetic couplers. Addressing this, this study introduces a novel approach employing heat sink and thermoelectric cooler technologies to mitigate temperature rise in magnetic couplers, which is particularly crucial for high-power applications. Utilizing ANSYS simulation, the study evaluates a WPT high-power application coil model with a total output power of 2 KW and an 18 cm air gap, with a 3.5 cm adjacent alignment to enhance thermal performance on both transmitter and receiver sides. Results demonstrate significant thermal enhancement, reducing the temperature of coils from 63◦ C to 54◦ C solely with the heat sink and further down to 48◦ C with the combined implementation of both heat sink and thermoelectric cooler. These measures effectively dissipate heat from the coils into the surrounding air, ensuring system efficiency and stability while facilitating functionality of system components. © 2024, Electromagnetics Academy. All rights reserved.

关键词： Heat sinks

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A Multi-trace Surface Integral Equation Solver to Analyze Electromagnetic Field Interactions on Graphene-based Devices

A Multi-trace Surface Integral Equation Solver to Analyze El...

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2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio science Meeting, AP-S/URSI 2022

作者： Zhao, Ran Chen, Liang Hu, Jun Bagci, Hakan Electrical and Computer Engineering Program Computer Electrical and Mathematical Science and Engineering Division Thuwal23955 Saudi Arabia School of Electronic Science and Engineering Chengdu610056 China

ISBN: (数字)9781665496582

ISBN: (纸本)9781665496582

A multi-trace surface integral equation (MT-SIE) solver is proposed to analyze electromagnetic field interactions on graphene-based devices. This solver decomposes the computation domain into an exterior subdomain (the background medium where the device resides in) and an interior subdomain that represents the device's dielectric substrate. The infinitesimally thin graphene sheet partially covers the interface between these two subdomains. On the graphene surface and the rest of this interface, resistive Robin transmission conditions (formulated for the first time in this work) and the traditional Robin transmission conditions are used to "connect"these two subdomains, respectively. In each subdomain, the electric and magnetic field equations are used as the governing equations. Various numerical examples are presented to demonstrate the accuracy and the applicability of the proposed MT-SIE solver. © 2022 IEEE.

关键词： Graphene

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NONMETALIC COMPOSITES AGING IN OIL AND GAS APPLICATION 20

NONMETALIC COMPOSITES AGING IN OIL AND GAS APPLICATION

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20th European Conference on Composite Materials: Composites Meet Sustainability, ECCM 2022

作者： Badeghaish, Wael Wagih, Ahmed Seraj, Muhamed Lubineau, Gilles Physical Science and Engineering Division Mechanical Engineering Program Laboratory of Mechanics of Composites for Energy and Mobility Thuwal23955 Saudi Arabia

ISBN: (纸本)9782970161400

Polymeric composites have been used to replace metals in many onshore and offshore applications due to their corrosion resistance. Transporting petrochemical gases and acids via composite materials at high pressure and temperature represents a challenge because the lack of confidence in such aggressive environments. Therefore, understanding the change in the physical and mechanical properties in polymeric composites under aggressive oil conditions is essential for providing novel designs and materials for these applications. This work presents a short literature review on the challenges facing application of polymeric composites in the oil and gas downhole aggressive corrosion environment. Moreover, it presents preliminary inspection on the integrity of a thermoplastic polymer (PEEK) subjected to HCl (0.8 Ph) at high temperatures (50 and 100 °C) for 14 days. The preliminary results demonstrated the good chemical resistance of PEEK at high temperature. Moreover, there was no effect on the mechanical properties of the PEEK at these conditions. ©2022 Wael et al.

关键词： Corrosion resistance

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Fused-ring induced end-on orientation in conjugated molecular dyads toward efficient single-component organic solar cells

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Aggregate 2023年第2期4卷 291-299页

作者： Dongdong Xia Shengxi Zhou Wen Liang Tan Safakath Karuthedath Chengyi Xiao Chaowei Zhao Frédéric Laquai Christopher R.McNeill Weiwei Li Institute of Applied Chemistry Jiangxi Academy of SciencesNanchangChina Beijing Advanced Innovation Center for Soft Matter Science and Engineering&State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijingChina Department of Materials Science and Engineering Monash UniversityClaytonAustralia KAUST Solar Center(KSC) Physical Sciences and Engineering Division(PSE)Material Science and Engineering Program(MSE)King Abdullah University of Science and Technology(KAUST)ThuwalSaudi Arabia

The molecular orientations of conjugated materials on the substrate mainly include edge-on,face-on,and ***-on and face-on orientations have been widely observed,while end-on orientation has been rarely *** in organic solar cells(OSCs)charge transport is along the vertical direction,end-on orientation with conjugated backbones perpendicular to the substrate is recognized as the ideal microstructure for *** this work,we for the first time obtained the preferential end-on orientation in a conjugated molecular dyad that contains a conjugated backbone as donor and perylene bisimide side units as *** was realized by introducing a fused-ring structure to replace linear terthiophenes with conjugated backbones,yielding F-MDPBI and L-MDPBI ***,a shifting trend of the molecular orientation from dominating edge-on in L-MDPBI to preferential end-on in F-MDPBI was *** a consequence,vertical charge carrier mobilities in F-MDPBI are one order of magnitude higher than those with preferential edge-on orientation,so single-component OSCs based on this molecular dyad as a single photoactive layer provided a power conversion efficiency of 4.89% compared to 1.70% based on L-MDPBI with preferential edge-on orientation.

关键词： conjugated molecular dyads crystallinity edge-on end-on single-component organic solar cells

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Mode engineering in reconfigurable fractal topological circuits

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physical Review B 2024年第23期109卷 235406-235406页

作者： Jiajun He Hao Jia Haoxiang Chen Tao Wang Shuo Liu Jianjun Cao Zhen Gao Ce Shang Tie Jun Cui School of Physical Science and Technology State Key Laboratory of Millimeter Waves School of Science Department of Electronic and Electrical Engineering Aerospace Information Research Institute Chinese Academy of Sciences Beijing 100094 China Physical Science and Engineering Division

Circuits can provide a versatile platform for exploring new physics, particularly in probing the topological phases within complex geometries. Fractals, celebrated for their intricate, self-similar duality, and noninteger dimensions, particularly those embedded in complex manifolds, remain uncharted in this context. In our research, we implement Sierpiński fractal topological insulators within reconfigurable fractal topological circuits while expanding the scope to include the cylindrical and toroidal structures. Our approach is grounded in consistency theory and reinforced through experimental verification, confirming the presence of unconventional higher-order topological phenomena referring to the abundance of topological edge and corner modes. Intriguingly, the quantity of these edge and corner modes is proportional to the volume modes relative to the system size, with an exponent aligning with the Hausdorff fractal dimension of the Sierpiński carpet. This study paves the way for a deeper exploration of topological modes within fractal geometries, potentially unlocking new avenues in topological physics.

关键词： Edge states Topological phases of matter 1-dimensional systems Flexible electronics Fractals Tight-binding model

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Photocatalytic bio-inspired PDA-RGO/g-C3N4 nanocomposite incorporated PES membrane for removal of environmental antibiotic pollutants

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Journal of Chemical Technology and Biotechnology 2024年第6期99卷 1401-1413页

作者： Govardhanan, B. GokulaKrishnan, S.A. Arthanareeswaran, G. Ashok, M. Chen, Yong-Song Taweepreda, W. Membrane Research Laboratory Department of Chemical Engineering National Institute of Technology Tiruchirappalli Tiruchirappalli India New Generation Materials lab Department of Physics National Institute of Technology Tiruchirappalli Tiruchirappalli India Department of Mechanical Engineering and Advanced Institute of Manufacturing with High-tech Innovations National Chung Cheng University Chiayi County Taiwan Polymer Science Program Division of Physical Science Faculty of Science Prince of Songkla University Hat-Yai Thailand

BACKGROUND: Membrane technology makes it more suitable for the treatment of environmental polluted organic wastewater. Membrane fouling is one of the major concerns in commercial membranes. To overcome this issue, photocatalytic nanomaterials are embedded into the membrane to enhance its surface nature and reusability. In this investigation, polydopamine functionalized graphene oxide (PDA-RGO), graphite carbon nitride (g-C3N4) and PDA-RGO/g-C3N4 nanomaterials were incorporated within polyethersulfone membrane fabricated via a phase inversion technique. These as-prepared membranes’ functional groups and surface morphologies were investigated by Fourier transform infrared (FTIR) spectroscopy, atomic force microscopy (AFM) and field emission electron microscopy (FESEM). These as-prepared membranes were investigated for photocatalytic activity under visible-light-driven photodegradation by environmental pollutants such as Rhodamine B (RhB) and Norfloxacin (NOR). RESULTS: Compared with pristine PES membrane, the PDA-RGO/g-C3N4-PES nanocomposite membrane showed higher photocatalytic activity for Rhodamine B 94.6% and Norfloxacin 96.8%, also reached greater water flux 189 L m−2 h−1. Therefore, the bio-inspired nanocomposite-modified PDA-RGO/g-C3N4 photocatalytic membrane could have huge potential in processing environmentally polluted water. CONCLUSIONS: PDA-RGO/g-C3N4-PES nanocomposite membrane improved the membrane hydrophilicity, water flow, anti-fouling performance, rejection studies and photocatalytic degradation than the pristine membrane. The synergistic result of PDA-RGO and g-C3N4 exhibits better photodegradation efficiency of the membrane towards environmental pollutants. © 2024 Society of Chemical Industry (SCI). © 2024 Society of Chemical Industry (SCI).

关键词： Nanocomposites

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Negative PO3-implanted bionic ion transport channels for promoting Li-S battery

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science China Chemistry 2025年

作者： Wenhuan Huang Shun Wang Xuehan Hou Yanan Zhang Xingxing Zhang Yaoxiao Zhao Xilang Jin Huabin Zhang Fei Wang Jian Zhang Key Laboratory of Chemical Additives for China National Light Industry College of Chemistry and Chemical EngineeringShaanxi University of Science and Technology School of Materials and Chemical Engineering Xi'an Technological University Chemistry Program Physical Science and Engineering Division King Abdullah University of Science and Technology State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences

Lithium-sulfur （Li-S） battery,as a promising next-generation high-energy-density battery,suffers from lithium polysulfides（LPSs） shuttle and Li dendrites *** crystalline framework-based membranes as separator can effectively absorb and restrain LPSs but without precise structural design principal exploration and mechanism ***,bio-inspired 1D oriented lithium-ion transport channels with molecular negatively charged PO3（-1） have been developed in hybrid tetrazole frameworks for promoting the transmission of Li+*** theoretical calculations and in situ spectroscopy demonstrated the higher binding energy and inhibited diffusion of LPSs in *** assembled PP@PO3Janus separator in Li-S coin cell delivered a high initial capacity of 1410.9 mAh g-1at 0.1 C and a low attenuation rate of 0.038%per cycle over 500 cycles at 5 ***,the high capacities of 862,542 and 409 mAh g-1based on high-sulfur-loading cathodes of 2.6,3.8 and 5.0 mg cm-2at0.5 C were achieved,***,the punch battery of PO3@PP separator with S-cathode of 1.2 mg cm-2has been developed for demonstrating its potentials commercial application,which displays impressive capacity of 873.4 mAh g-1with the retention of～78.9%over 50 cycles.

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Machine learning assisted plasmonic metascreen for enhanced broadband absorption in ultra-thin silicon films

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光：科学与应用（英文版） 2025年第2期14卷 411-421页

作者： Waqas W.Ahmed Haicheng Cao Changqing Xu Mohamed Farhat Muhammad Amin Xiaohang Li Xiangliang Zhang Ying Wu Division of Computer Electrical and Mathematical Sciences and EngineeringKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia College of Engineering Taibah UniversityMadinah 42353Saudi Arabia Division of Computer Electrical and Mathematical Sciences and EngineeringKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia Division of Physical Science and Engineering King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia Division of Computer Electrical and Mathematical Sciences and EngineeringKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia Department of Computer Science and Engineering University of Notre DameNotre DameIN 46556USA

We propose and demonstrate a data-driven plasmonic metascreen that efficiently absorbs incident light over a wide spectral range in an ultra-thin silicon *** embedding a double-nanoring silver array within a 20 nm ultrathin amorphous silicon(a-Si)layer,we achieve a significant enhancement of light *** enhancement arises from the interaction between the resonant cavity modes and localized plasmonic modes,requiring precise tuning of plasmon resonances to match the absorption region of the silicon active *** facilitate the device design and improve light absorption without increasing the thickness of the active layer,we develop a deep learning framework,which learns to map from the absorption spectra to the design *** inverse design strategy helps to tune the absorption for selective spectral *** optimized design surpasses the bare silicon planar device,exhibiting a remarkable enhancement of over 100％.Experimental validation confirms the broadband enhancement of light absorption in the proposed *** proposed metascreen absorber holds great potential for light harvesting applications and may be leveraged to improve the light conversion efficiency of ultra-thin silicon solar cells,photodetectors,and optical filters.

关键词： silicon learning absorption assisted broadband enhanced films machine metascreen plasmonic

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DC and RF Performance Analysis of Junctionless Gate All Around Nanosheet MOSFET 9

DC and RF Performance Analysis of Junctionless Gate All Arou...

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9th IEEE International Women in engineering (WIE) Conference on electrical and Computer engineering, WIECON-ECE 2023

作者： Debnath, Joyprokash Anjum, Mahfuza Akhyear, Md Hasin Singha, Showmik Shahjalal University of Science and Technology Department of Electrical and Electronic Engineering Sylhet3114 Bangladesh Physical Design Division Neural Semiconductor Limited Dhaka1230 Bangladesh

ISBN: (纸本)9798350319651

This article presents an analysis of the DC and RF/analog performance of junctionless gate-all-around nanosheet MOSFET (JL-GAA-NSFET), focusing on the evaluation of short channel effects (SCEs) and RF performance parameters. The findings of the study indicate that the JL-GAA-NSFET shows greater compatibility for low-power applications with smaller gate lengths as it demonstrates better endurance to the SCEs in comparison to the conventional inversion mode nanosheet MOS-FET (IM-GAA-NSFET). The JL-GAA-NSFET demonstrates a significant enhancement in several key performance metrics compared to the IM-GAA-NSFET. Specifically, it exhibits a 30% improvement in drain-induced barrier lowering (DIBL), a 13.5 % improvement in subthreshold swing (SS), a reduction of approximately 7 times in off-state current, an increase of approximately 6 times in the Ion/Ioff ratio, and a substantial decrease of 2×102 times in gate-induced drain leakage (GIDL) current. However, in terms of RF performance metrics, JL-GAA-NSFET shows comparatively low transconductance (gm) and cut-off frequency (ft). The JL-GAA-NSFET shows a peak gm value of 2.73×10-4 S, a ft value of 619 GHz, and a TGF value of 96.72 V-1, which are about 20%, 42.14% reduction, and a 24% increase, respectively, compared to the IM-GAA-NSFET. © 2023 IEEE.

关键词： Nanosheets

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