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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Ghanekar, Alok Wang, Jiahui Guo, Cheng Fan, Shanhui Povinelli, Michelle L. Ming Hsieh Department of Electrical and Computer Engineering University of Southern California Los Angeles90089 United States Department of Applied Physics Stanford University StanfordCA94305 United States Department of Electrical Engineering Stanford University StanfordCA94305 United States

We present a non-reciprocal thermal emitter based on the dynamic space-time modulation of graphene. Compound symmetry in the system gives rise to a new dimension of tunable thermal emission in non-reciprocal systems. ... 详细信息

ISBN: (纸本)9781957171258

关键词： Graphene

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An efficient hyper-elastic model for the preforming simulation of Carbon-Kevlar hybrid woven reinforcement

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Chinese Journal of Aeronautics 2022年第12期35卷 321-335页

作者： Sasa GAO Zhengtao QU Yunjie ZHANG Zizhao ZHAO Biao LIANG College of Mechanical&Electrical Engineering Shaanxi University of Science&TechnologyXi’an 710021China State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an 710072China

An efficient hyper-elastic model that can reflect the primary mechanical behaviors of Carbon-Kevlar hybrid woven reinforcement was developed and implemented with VUMAT constitutive code for preforming *** model parameters were accurately determined through the uniaxial and bias-extension *** calibrate the simulation code,preforming experiments of hybrid woven reinforcement over the hemisphere mold and tetrahedron mold were respectively conducted to validate the proposed hyper-elastic *** comparison between the simulations and experiments shows that the model can not only accurately capture shear angle distribution and geometry shape after deformation,but also accurately predict the force–displacement curve and potential fiber tensile failure during the preforming *** result indicates that the proposed model can be used to predict the preforming behavior of Carbon-Kevlar hybrid woven reinforcement,and simulate its manufacturing process of complicated geometry.

关键词： Constitutive law Finite element analysis Hybrid woven reinforcement Hyper-elastic Preforming

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Time domain response of corrugated transmission lines

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IET Microwaves, Antennas and Propagation 2024年第1期18卷 19-34页

作者： Wu, Chia Ho Wang, Wei Peng, Song Tsuen Qian, Zhenyu Shen, Jianqi Ye, Guoqiang Ni, Donghua He, Fang Shen, Linfang Quan, Bisheng Jiao, Yajie Department of Applied Physics College of Science Zhejiang University of Technology Hangzhou China Department of Electrical Engineering National Yang Ming Chiao Tung University Hsinchu Taiwan Centre for Optical and Electromagnetic Research College of Optical Science and Engineering Zhejiang University Hangzhou China Zhejiang Zhaolong Interconnect Technology Co. Ltd. Huzhou China Cosine Technology Co. Ltd. Xiamen China

In order to employ periodic corrugated microstrip lines for reducing or suppressing electromagnetic interference in high-speed or high-frequency circuits, a precise method is necessary to calculate and measure the characteristic impedance of periodic microstrip lines. The equation for characteristic impedance (depending on frequency) of lossless periodic microstrip lines was obtained based on the transfer matrix method. A time domain pulse was used to measure the instantaneous impedance of conventional microstrip lines, and when the instantaneous impedance does not change with distance, it can be identified as the characteristic impedance of microstrip lines. However, when the time-domain pulses are employed to measure the instantaneous impedance of periodic microstrip lines, rapid oscillations occur with distance. Therefore, a standard for spacing between adjacent grooves in the microstrip line can be suggested by analysing the interaction between the time-domain pulses and the microstrip line grooves. Once such a standard is satisfied, many grooves etched along the microstrip line would no longer be distinguished by the time-domain pulses. Such a principle and method can be used to determine the instantaneous impedance for the microstrip lines that have periodic grooves. On the other hand, when several periodic structures with different lattice constants coexist on a microstrip line, they can also be distinguished via the instantaneous impedance. A time domain reflectometer was used for measuring the instantaneous impedance of periodic microstrip lines, and the measured results are in agreement with the theoretical analysis. © 2023 The Authors. IET Microwaves, Antennas & Propagation published by John Wiley & Sons Ltd on behalf of The Institution of engineering and Technology.

关键词： Electric lines

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A Portable 3D-Printed Dielectric Lens Antennas for Liquid-Mixture Characterization

A Portable 3D-Printed Dielectric Lens Antennas for Liquid-Mi...

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2023 IEEE International Symposium on Antennas and Propagation, ISAP 2023

作者： Sangpet, Patchadaporn Thaiwirot, Wanwisa Chudpooti, Sukanya Akkaraekthalin, Prayoot Somjit, Nutapong Chudpooti, Nonchanutt Department of Electrical and Computer Engineering Faculty of Engineering King Mongkut’s University of Technology North Bangkok Bangkok Thailand Department of Industrial Physics and Medical Instrumentation Faculty of Applied Science King Mongkut’s University of Technology North Bangkok Bangkok Thailand School of Electronic and Electrical Engineering University of Leeds Leeds United Kingdom

ISBN: (纸本)9798350341140

The Fused Deposition Modeling (FDM) method is utilized in this research to present dielectric lens antennas that were 3D printed. The ultra-wideband (UWB) stub antenna's antenna characteristic is intended to be improved by the 3D-printed dielectric lens antennas. The proportion of ethanol in the liquid mixture sample is categorized using the transmission-line measuring technique. The device-under-test (DUT) is placed between two 3D-printed dielectric lens antennas. The glass bottle is filled with a 100-ml liquid sample and covered with a plastic cap. The 3D EM Simulation CST Studio is used to optimize the 10 mm gap between the dielectric lens antennas and the DUT. Six concentrations of the ethanol/water mixture, such as empty, 60%, 65%, 70%, and 80%, are measured to examine the measurement system. The measurement outcomes indicate the various S21 (transmission coefficient) levels between 9 GHz and 11 GHz. According to the trend of the suggested system, the level of the transmission coefficient, S21, will change downward when the proportion of ethanol is increased. Several better advantages, such as a nondestructive method, non-contact measurement, and support with a real-time monitoring system, are provided by the transmission-line measuring methodology using 3D-printed dielectric lens antennas. © 2023 IEEE.

关键词： 3D-printed dielectric lens antennas Fused Deposition Modeling technique non-destructive measurement real-time monitoring system

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Qualitative behavior of a highly non-linear Cutaneous Leishmania epidemic model under convex incidence rate with real data

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Mathematical Biosciences and engineering 2024年第2期21卷 2084-2120页

作者： Alqhtani, Manal Saad, Khaled M. Zarin, Rahat Khan, Amir Hamanah, Waleed M. Department of Mathematics College of Sciences and Arts Najran University Najran Saudi Arabia Bangkok10140 Thailand Department of Mathematics and Statistics University of Swat Khyber Pakhtunkhawa Pakistan Applied Research Center for Metrology Standards and Testing King Fahd University of Petroleum and Minerals Dhahran31261 Saudi Arabia Department of Electrical Engineering College of Engineering and Physics King Fahd University for Petroleum and Minerals Dhahran Saudi Arabia

In the context of this investigation, we introduce an innovative mathematical model designed to elucidate the intricate dynamics underlying the transmission of Anthroponotic Cutaneous Leishmania. This model offers a comprehensive exploration of the qualitative characteristics associated with the transmission process. Employing the next-generation method, we deduce the threshold value R0 for this model. We rigorously explore both local and global stability conditions in the disease-free scenario, contingent upon R0 being less than unity. Furthermore, we elucidate the global stability at the disease-free equilibrium point by leveraging the Castillo-Chavez method. In contrast, at the endemic equilibrium point, we establish conditions for local and global stability, when R0 exceeds unity. To achieve global stability at the endemic equilibrium, we employ a geometric approach, a Lyapunov theory extension, incorporating a secondary additive compound matrix. Additionally, we conduct sensitivity analysis to assess the impact of various parameters on the threshold number. Employing center manifold theory, we delve into bifurcation analysis. Estimation of parameter values is carried out using least squares curve fitting techniques. Finally, we present a comprehensive discussion with graphical representation of key parameters in the concluding section of the paper. © 2024 the Author(s), licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution License.

关键词： Sensitivity analysis

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Grey correlation analysis of milling temperature and milling vibration of TC4 titanium alloy

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Noise and Vibration Worldwide 2022年第6期53卷 330-339页

作者： Li, Shuncai Hu, Yuting Popov, Eugene School of Mechanical and Electrical Engineering Jiangsu Normal University Xuzhou China JSNU-SPBPU Institute of Engineering Jiangsu Normal University Xuzhou China Higher School of Applied Physics and Space Technologies Peter the Great St Petersburg Polytechnic University Russia

In this paper, a synchronous acquisition system of milling temperature and milling vibration was established to measure the data of milling temperature and milling vibration. Based on grey correlation theory, the influence of milling parameters and milling vibration on milling temperature was analyzed. It is found that the grey correlation degree between milling temperature and milling parameters and vibration is above 0.70, indicating that milling parameters and vibration have great influence on temperature. In addition, the GM (0, N) grey prediction model of milling temperature on milling parameters and milling vibration was established, and the correlation coefficient of the model was above 0.8, indicating that the reliability of the model was high, and the correlation between milling temperature and milling vibration signal was high. © The Author(s) 2022.

关键词： Vibration analysis

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Vectorial liquid‑crystal holography

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eLight 2024年第1期4卷 251-261页

作者： Ze‑Yu Wang Zhou Zhou Han Zhang Yang Wei Hong‑Guan Yu Wei Hu Wei Chen Hai‑Tao Dai Ling‑Ling Ma Cheng‑Wei Qiu Yan‑Qing Lu National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and ManipulationCollaborative Innovation Center of Advanced MicrostructuresCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210023China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology School of ScienceTianjin UniversityTianjin 300072China

Vectorial optics with fine inhomogeneous polarization control are highly *** have been captivated a promising candidate,but their static post-fabrication geometry largely limits the dynamic *** crystal(LC)is usually employed as an additional index-changing layer together with ***,most of the reported LCs only impart a varying but uniform phase on top of that from the metasurface,which we term“scalar”LC ***,we pixelate a single-layer LC to display versatile and tunable vectorial holography,in which the polarization and amplitude could be arbitrarily and independently controlled at varying spatial ***,the subtle and vectorial LC-holography highlights the broadband and electrically-switchable *** vectorial LC holography reveals significant opportunities for advanced cryptography,super-resolution imaging,and many other applications.

关键词： Liquid crystals Vectorial optics Holography

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Effects of self-healing biomimetic subsoiler on tillage resistance, wearcorrosion performance and soil disturbance morphology under different soil types

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International Journal of Agricultural and Biological engineering 2023年第3期16卷 7-14页

作者： Yueming Wang Chenjie Lu Jing Chen Chenhuan Cui Yijie Pan Wilhelm Pfleging Jiyu Sun School of Engineering Huzhou UniversityHuzhou 313000ZhejiangChina Liaoning Provincial Institute of Agricultural Mechanization Shenyang 110161China School of Information and Electrical Engineering Hangzhou City University51 Huzhou StreetHangzhou 310015China FUSTEEL Co. LtdHuzhou 313000ZhejiangChina Institute for Applied Materials-Applied Materials Physics Karlsruhe Institute of TechnologyKarlsruhe 76344Germany Key Laboratory of Bionic Engineering(Ministry of Education China)Jilin UniversityChangchun 130022China

Subsoiling has been widely used all over the world as an important operation method of no-tillage *** energy-saving and life-extension,the tillage resistance and wear-corrosion of subsoilers have attracted wide *** this study,the tillage resistance,soil disturbance,wear and corrosion of subsoiler with S-T-SK-2#biomimetic structures(S means subsoiler;T means tine;SK means shank;2#,h/s=0.57,h=5 mm andα=45°.)and self-healing coating under two seasons,two locations with different soil properties(black loam and clay soil)and subsoiling speeds(2 km/h and 3.6 km/h)were *** soil moisture content and compactness affected the tillage resistance and *** tillage resistance and degree of corrosion on all subsoilers were much larger in clay soil than that in black loam *** with S-T-SK-2#,the tillage reduction rate of C-S-T-SK-2#(S-T-SK-2#with self-healing coating)was up to 14.32%in clay soil under the speed of 2 km/*** significance tests of regression equation results showed that subsoiler type and soil properties had a significant impact on soil disturbance coefficient,swelling of total soil layer,bulkiness of the plough *** is of a guiding significance for the analysis of soil *** mechanism of subsoiler coupling with biomimetic structures and self-healing coating was analyzed in *** depicted the guiding effect of biomimetic structure and the shield function of self-healing coating,resulting in anticorrosion and wear resistance of subsoiler.

关键词： soil types tillage resistance wear-corrosion soil disturbance self-healing

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Dissipation and amplification management in an electrical model of microtubules: Hybrid behavior network

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Chinese physics B 2023年第11期32卷 392-400页

作者： Sedric Ndoungalah Guy Roger Deffo Arnaud Djine Serge Bruno Yamgoue Department of Physics Faculty of ScienceUniversity of BamendaP.O.Box 39 BamendaCameroon Research Unit of Automation and Applied Computers(UR-AIA) Department of Electrical EngineeringIUT-FV of BandjounUniversity of DschangBP 134BandjounCameroon Department of Physics Higher Teacher Training College BambiliThe University of BamendaP.O.Box 39 BamendaCameroon

The control of dissipation and amplification of solitary waves in an electrical model of a microtubule is *** model consists of a shunt nonlinear resistance–capacitance(J(V)–C(V)) circuit and a series resistance–inductance(R–L) circuit. Through linear dispersion analysis, two features of the network are found, that is, low bandpass and bandpass filter characteristics. The effects of the conductance’s parameter λ on the linear dispersion curve are also analyzed. It appears that an increase of λ induces a decrease(an increase) of the width of the bandpass filter for positive(negative) values of λ. By applying the reductive perturbation method, we derive the equation governing the dynamics of the modulated waves in the system. This equation is the well-known nonlinear Schr?dinger equation extended by a linear term proportional to a hybrid parameter σ, i.e., a dissipation or amplification coefficient. Based on this parameter, we successfully demonstrate the hybrid behavior(dissipation and amplification) of the system. The exact and approximate solitary wave solutions of the obtained equation are derived, and the effects of the coefficient σ on the characteristic parameters of these waves are investigated. Using the analytical solutions found, we show numerically that the waves that are propagated throughout the system can be dissipated, amplified, or remain stable depending on the network parameters. These results are not only in agreement with the analytical predictions, but also with the existing experimental results in the literature.

关键词： microtubule dissipation and amplification hybrid behavior solitary wave solutions

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A 140 GHz SiGe Power Amplifier with >12.5 dBm P1dB and >8% PAE for Phased Array Systems in 6G Communication

A 140 GHz SiGe Power Amplifier with >12.5 dBm P1dB and >8% P...

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2023 IEEE Microwaves, Antennas, and Propagation Conference, MAPCON 2023

作者： Kumar, Sonu Kalyan, Robin Alphones, Arokiaswami Singh, Ranjan Nanyang Technological University Singapore School of Electrical and Electronic Engineering Singapore Institute of Microelectronics Agency for Science Technology and Research Singapore Spms Nanyang Technological University Singapore Division of Physics and Applied Physics Singapore

ISBN: (纸本)9798350328264

This paper presents a 140 GHz power amplifier for phased array systems in 6G communication. The power amplifier is designed using 130nm SiGe process (SG13G2) from IHP foundry. To compensate for low gain of devices at Sub-THz/THz frequencies, the proposed single-ended two-stage power amplifier utilizes cascode topology for each stage. Additionally, the proposed work carefully analyses the impact of interconnects/parasitic on device performance and subsequently minimizes the interconnect/parasitic losses to achieve state-of-art power added efficiency of 8-15% and gain of >20 dB in two stages. The power amplifier shows output P1dB of >12.5 dBm from 133-153 GHz with corresponding PAE of about 10 %. Achieved saturated power (Psat) is >14.2 dBm with corresponding PAE of about 12 % over this band. © 2023 IEEE.

关键词： 6G Beamforming BiCMOS D-band IC Power Amplifier Sub-THz/THz communication

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