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International Flexible Electronics Technology Conference (IFETC)

作者： Nandu Koripally Lulu Yao Naresh Eedugurala Jason D. Azoulay Tse Nga Ng Department of Electrical and Computer Engineering University of California San Diego La Jolla CA USA Materials Science Engineering Program University of California San Diego La Jolla CA USA Chemisty Department Georgia Institute of Technology Atlanta GA USA

Supercapacitors are known for longer cycle life and faster charging rate compared to batteries. However, the energy density of supercapacitors requires improvement to expand their application space. To raise the energy density of redox supercapacitors, this work demonstrates electro-polymerization on both sides of electrodes to increase material loading, reduce overall device mass, and consequently increase the capacitance, power, and energy density of supercapacitors. We achieved an energy density of 1823 mWh kg -1 and a power density of 16.5 W kg -1 with a wide potential window of 3 V.

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A Sparse DAE Solver in Maple

arXiv

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arXiv 2022年

作者： Jang, Taejin Uppaluri, Maitri Subramanian, Venkat R. Materials Science and Engineering Program Texas Materials Institute The University of Texas at Austin AustinTX78712 United States Walker Department of Mechanical Engineering The University of Texas at Austin AustinTX78712 United States Oden Institute for Computational Science and Engineering The University of Texas at Austin AustinTX United States

In this paper, some adaptive single-step methods like Trapezoid (TR), Implicit-mid point (IMP), Euler-backward (EB), and Radau IIA (Rad) methods are implemented in Maple to solve index-1 nonlinear Differential Algebraic Equations (DAEs). Maple's robust and efficient ability to search within a list/set is exploited to identify the sparsity pattern and the analytic Jacobian. The algorithm and implementation were found to be robust and efficient for index-1 DAE problems and scales well for finite difference/finite element discretization of two-dimensional models with system size up to 10,000 nonlinear DAEs and solves the same in few seconds. © 2022, CC BY-NC-ND.

关键词： Differential equations

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Alignment and Transfer of Silver Nanowire Arrays onto Unconventional Substrates for Optoelectronic Devices via Dielectrophoresis Force

Alignment and Transfer of Silver Nanowire Arrays onto Unconv...

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International Conference on Electronics Packaging (ICEP)

作者： Yen-Shuo Chen Shun-Yu Liu Ching-Chang Lin Hua-Tai Fan Yu-Chien Ko Chun-Chi Chen Fu-Hsiang Ko Department of Materials Science and Engineering National Yang Ming Chiao Tung University Department of General System Studies The University of Tokyo Institute of Pioneer Semiconductor Innovation National Yang Ming Chiao Tung University Taiwan Semiconductor Research Institute

ISBN: (数字)9784991191176

ISBN: (纸本)9798350385908

As for AgNWs arrays for solar cell applications, our goal is to deposit AgNWs arrays on solar cells for enhancing photovoltaic conversion efficiency. The resulting alignment is ideal when AgNWs arrays are aligned on interdigitated electrodes by dielectrophoresis force in previous experiments, but not for aligning AgNWs arrays directly on silicon solar cell with pyramidal structure texture. In order to solve the limitations, the alignment is integrated with the transfer printing technique, and the fabrication approach is low-cost, fast, and scalable to large-area NW arrays, which offers flexible applications for developing NW-based devices with unconventional substrates.

关键词： Printing Silver Photovoltaic cells Building integrated photovoltaics Force Optoelectronic devices Silicon

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Phase Equilibria and Thermodynamics Assessment of the Co-Fe-Nb Ternary System

SSRN

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SSRN 2023年

作者： Hutabalian, Yohanes Hermana, Gita Novian Laksono, Andromeda Dwi Chen, Sinn-Wen Department of Chemical Engineering National Tsing Hua University Hsinchu30013 Taiwan Research and Development Center PT. Gotion Indonesia Materials Jakarta12950 Indonesia Department of Advanced Materials Engineering Bandung Polytechnic for Manufacturing West Java Bandung40135 Indonesia Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei10672 Taiwan Study Program of Materials and Metallurgical Engineering Institut Teknologi Kalimantan Soekarno-Hatta Street Km. 15 Karang Joang Balikpapan East Kalimantan76127 Indonesia High Entropy Materials Center National Tsing Hua University Hsinchu30013 Taiwan

The Co-Fe-Nb materials system is a crucial material for magnetic applications. Despite its importance, the phase equilibria and thermodynamic characteristics of this ternary system have not been explored in detail. This study employs the Calphad method to model the phase equilibria of the Co-Fe-Nb ternary system. To obtain the ternary interaction parameters, the experimental data on the isothermal sections at temperatures ranging from 700°C to 1300°C was evaluated. These findings indicate that the Co-Fe-Nb system contains no ternary compound, and the (Co,Fe)7Nb6 phase exists as a single solid solution. Significant solubility of the third element in the binary compounds of Co2Nb (laves C14) and Fe2Nb (laves C15) is also observed. The results are in good agreement with the experimental data. Furthermore, a liquidus projection of the system is presented, for the first time, revealing seven primary solidification phases in the Co-Fe-Nb ternary system. © 2023, The Authors. All rights reserved.

关键词： Ternary systems

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Magnetic phase diagram and multiple field-induced states in the intermetallic triangular-lattice antiferromagnet NdAuAl4Ge2 with Ising-like spins

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Physical Review materials 2023年第2期7卷 024423-024423页

作者： Mengru Cong Han Ge Lei Zhang Weijun Ren Nan Zhao Tiantian Li Shanmin Wang Jinlong Zhu Jiawei Mei Qiang Zhang Jieming Sheng Fei Gao Bing Li Zhidong Zhang Liusuo Wu Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Department of Physics Southern University of Science and Technology Shenzhen 518055 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou 341000 China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and Technology Shenzhen 518055 China Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Shenzhen 518055 China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong) Shenzhen 518045 China

Geometrical frustration and the enhancement of strong quantum fluctuations in two-dimensional triangular antiferromagnets can lead to various intriguing phenomena. Here, we studied the spin-1/2 triangular lattice antiferromagnet NdAuAl4Ge2. Thermodynamic and transport properties, such as magnetization and specific heat together with the resistivity measurements were performed. In zero field, two successive phase transitions were observed at TN1=1.75±0.02 and TN2=0.49±0.02 K, respectively. Under magnetic field, XXZ-type anisotropy was revealed with the moments pointing along the easy c axis. For B∥c, multiple field-induced states were observed, and the magnetic phase diagram was established based on the specific-heat and magnetization data. The temperature-dependent resistivity measurements indicate that NdAuAl4Ge2 is a good metal. It is very likely that both the long-range Ruderman-Kittel-Kasuya-Yosida interactions and the geometrical frustration play important roles in this case.

关键词： Frustrated magnetism Magnetic anisotropy Magnetic phase transitions Phase diagrams Phase transitions by order RKKY interaction Spin liquid Strongly correlated systems

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Multimode diffractive optical neural network

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Advanced Photonics Nexus 2024年第2期3卷 49-58页

作者： Run Sun Tingzhao Fu Yuyao Huang Wencan Liu Zhenmin Du Hongwei Chen Tsinghua University Beijing National Research Center for Information Science and TechnologyDepartment of Electronic EngineeringBeijingChina National University of Defense Technology College of Advanced Interdisciplinary StudiesHunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and DevicesChangshaChina

On-chip diffractive optical neural networks(DONNs)bring the advantages of parallel processing and low energy ***,an accurate representation of the optical field’s evolution in the structure cannot be provided using the previous diffraction-based analysis ***,the loss caused by the open boundaries poses challenges to applications.A multimode DONN architecture based on a more precise eigenmode analysis method is *** have constructed a universal library of input,output,and metaline structures utilizing this method,and realized a multimode DONN composed of the structures from the *** the designed multimode DONNs with only one layer of the metaline,the classification task of an Iris plants dataset is verified with an accuracy of 90%on the blind test dataset,and the performance of the one-bit binary adder task is also *** to the previous architectures,the multimode DONN exhibits a more compact design and higher energy efficiency.

关键词： optical computing mode multiplexing diffraction optical neural network

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Observation of mechanical kink control and generation via phonons

arXiv

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arXiv 2025年

作者： Qian, Kai Cheng, Nan Serafin, Francesco Sun, Kai Theocharis, Georgios Mao, Xiaoming Boechler, Nicholas Department of Mechanical and Aerospace Engineering University of California San Diego La Jolla CA92093 United States Department of Physics University of Michigan Ann ArborMI48109 United States Department of Physics and Materials Science University of Luxembourg 2 Avenue de l’Universite L Esch-sur-Alzette4365 Luxembourg CNRS Le Mans Université France Program in Materials Science and Engineering University of California San Diego La Jolla CA92093 United States

Kinks (or domain walls) are localized transitions between distinct ground states associated with a topological invariant, and are central to many phenomena across physics, from condensed matter to cosmology. While phonon (i.e., small-amplitude vibration) wave packets have been theorized to deterministically interact with kinks and initiate their movement, this interaction has remained elusive in experiments, where only uncontrollable stochastic kink motion generated by thermal phonons or dislocation glide by low-frequency quasi-static loading have been observed. This is partly because all physical systems that support kinks are, at some level, discrete, making deterministic phonon control of kinks extremely challenging due to the existence of Peierls-Nabarro (PN) barrier. Here, we demonstrate, for the first time, experimental observation of phonon-mediated control and generation of mechanical kinks, which we enable using a topological metamaterial that constitutes an elastic realization of the Kane-Lubensky chain model. Our metamaterial overcomes the PN barrier by supporting a single, topologically protected kink that requires zero energy to form and move. Using simulations that show close agreement with our experimental observations, we also reveal unique dynamics of phonon interplay with highly discrete kinks, including long-duration motion and a continuous family of internal modes, features absent in other discrete nonlinear systems. This work introduces a new paradigm for topological kink control, with potential applications in material stiffness tuning, shape morphing, locomotion, and robust signal transmission. © 2025, CC BY-NC-ND.

关键词： Stochastic systems

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Piezoelectric Electrostatic Superlattices in Monolayer MoS2

arXiv

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arXiv 2023年

作者： Ramasubramaniam, Ashwin Naveh, Doron Department of Mechanical and Industrial Engineering University of Massachusetts Amherst AmherstMA01003 United States Materials Science and Engineering Graduate Program University of Massachusetts Amherst AmherstMA01003 United States Faculty of Engineering Bar-Ilan University Ramat Gan52900 Israel Institute for Nanotechnology and Advanced Materials Bar-Ilan University Ramat Gan52900 Israel

Modulation of electronic properties of materials by electric fields is central to the operation of modern semiconductor devices, providing access to complex electronic behaviors and greater freedom in tuning the energy bands of materials. Here, we explore one-dimensional superlattices induced by a confining electrostatic potential in monolayer MoS2, a prototypical two-dimensional semiconductor. Using first-principles calculations, we show that periodic potentials applied to monolayer MoS2 induce electrostatic superlattices in which the response is dominated by structural distortions relative to purely electronic effects. These structural distortions reduce the intrinsic band gap of the monolayer substantially while also polarizing the monolayer through piezoelectric coupling, resulting in spatial separation of charge carriers as well as Stark shifts that produce dispersive minibands. Importantly, these minibands inherit the valley-selective magnetic properties of monolayer MoS2, enabling fine control over spin-valley coupling in MoS2 and similar transition-metal dichalcogenides. Copyright © 2023, The Authors. All rights reserved.

关键词： Monolayers

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Theoretical and Experimental studies on Characterisation and Collection of Particulate Matter in Single-Wire, Single-Stage Electrostatic Precipitator with Square Cross-Section

SSRN

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SSRN 2024年

作者： Kumar, Aiswarya A. Nawale, Prashant Rohidas Mayya, Y.S. Sahu, Manoranjan Aerosol and Nanoparticle Technology Laboratory Environmental Science and Engineering Department Indian Institute of Technology Bombay Mumbai400076 India Interdisciplinary Program in Climate Studies Indian Institute of Technology Bombay Mumbai400076 India Centre for Machine Intelligence and Data Science Indian Institute of Technology Bombay Mumbai400076 India Chemical Engineering Department Indian Institute of Technology Bombay Mumbai400076 India

Electrostatic precipitation (ESP) is a technology widely used to remove particulate matter (PM) from industrial gas streams. To adopt the same for varying scales as well as for different clean air delivery applications as in indoor and outdoor air pollution, there exists a requirement for the development of comprehensive, readily adaptable, reasonably good, comparable, rigorous, step-by-step analytical theory and experimental validation of same for design of modular units of ESP. In this regard, the current study conducted theoretical and experimental studies to investigate corona characterisation and PM collection efficiency in a modular unit of a single-wire, single-stage, wire-plate ESP with square cross-sectional geometry. The theoretical study integrated the corona discharge model with particle transport model while the experimental study was conducted using a laboratory scale ESP operated at different flow rates and various potentials. Results obtained from both theory and experimental studies for current-voltage (I-V) characteristics were consistent with the well-known quadratic behaviour beyond the critical potential. The best agreement between the I-V characteristics of theory and the experiment was obtained while adjusting the inception electric field ( to 12.35´105 Vm-1 as well as the ion diffusion coefficient value to 0.0647´10-4 m2s-1. Tuned theory predicted PM collection efficiency at three different flow rates of 30, 50 as well as 100 LPM and at various potentials 9 kV, 11 kV as well as 13 kV respectively. Comparing the predicted results from theory and experiment, it is understood that agreement between theory and experiment is acceptable in the case of varied flow rates and is good for potentials for varied size ranges from 13 nm to 800 nm. Relative error for local minimum efficiency between theory as well as experiment for three tested flow rates were 5.37%, 1.36%, 14.58% and was 1.36%, 7.52% and 6.23% for three potentials respectively. As accuracy

关键词： Electrostatic precipitators

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Long-Term Stability of NaOCl Passivation on CZTS Crystals Investigated via SEM-EDS

Long-Term Stability of NaOCl Passivation on CZTS Crystals In...

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IEEE Symposium on Nuclear science (NSS/MIC)

作者： J. Seo J. Byun K. Kim Y. Kim B. Park Department of Health and Safety Convergence Science Korea University Seoul Republic of Korea Interdisciplinary program in precision public health Korea University Seoul Republic of Korea Department of Materials Science and Engineering Korea University Seoul Republic of Korea School of Health and Environmental Science Korea University Seoul Republic of Korea Marine Radioactivity Monitoring Group Korea University Busan Republic of Korea

ISBN: (数字)9798350388152

ISBN: (纸本)9798350388169

This study investigates the efficient passivation of CdTe-based semiconductor crystals, focusing on the long-term stability and underlying mechanisms of NaOCl passivation. CdZnTeSe crystals were grown, processed, and passivated with NaOCl, and their surface characteristics were studied using SEM-EDS and XPS. The passivation was found to significantly enhance the surface resistance, with a sustained effect for more than 90 s, attributed to the formation of a tellurium oxide layer. The passivation process was further elucidated through detailed morphological and compositional analyses. The NaOCl-passivated crystals exhibited improved electrical and spectroscopic properties in radiation detection, with a prolonged stability of 60-90 days, which are longer compared to other passivants. Additionally, the feasibility of NaOCl passivation on a CdZnTeSe detector was explored, showcasing enhanced resistivity and spectroscopic performance. The study concludes with insights into the potential industrial application of NaOCl passivation for CdTe-based radiation detectors.

关键词： Microwave integrated circuits Semiconductor detectors Surface resistance Radiation detectors Surface morphology Crystals Stability analysis

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