检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Fanijo, Ebenezer O. Thomas, Joseph G. Zhu, Yizheng Guerrero, Javier Esquivel Hosking, Niamh C. Cai, Wenjun Michel, F. Marc Brand, Alexander S. The Charles E. Via Jr. Department of Civil and Environmental Engineering Virginia Polytechnic Institute and State University United States Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University United States Ford Motor Company United States Dept. of Material Science and Engineering Virginia Polytechnic Institute and State University United States Department of Geosciences Virginia Polytechnic Institute and State University United States

This research study presents a novel application of a quantitative phase microscopy technique, spectral modulation interferometry (SMI), for in situ nanoscale characterization of corrosion of an aluminum alloy in real time. SMI offers high sensitivity, rapid image acquisition, and speckle-free images;thus, real-time quantification of surface topography evolution during corrosion can be obtained accurately to evaluate the temporally- and spatially-dependent corrosion rates. With an innovative additive-manufactured fluid cell, experiments were performed in situ under flowing solution conditions. Electrochemical tests via stepwise polarization and solution chemistry through collected aliquots of outflow solution were also performed alongside the nanoscale SMI experiment to simultaneously provide a corroborating corrosion rate measurement. Based on the quantitative 3D height profiles across the corroded surface, pit formation resulting from rapid local corrosion was predominant, appearing at different times and are heterogeneously distributed across the surface. The computed time-dependent dissolution rates of aluminum also varied as the experiment proceeded, with the combination of linear and nonlinear surface normal distributions. An initial mean linear dissolution rate of [0.40 ± 0.007] μmol m −2 s −1 transitioned to a more rapid mean rate of [1.95 ± 0.035] μmol m −2 s −1, driven by the anodic polarization. Dissolution rates from the three performed methods follow similar trends and there is the visibility of linking the nanoscale in situ SMI data to the electrochemical corrosion measurements and ex situ chemical solution analysis. At the end of the corrosion period, rates of 118 μmol m −2 s −1, 71 μmol m −2 s −1, and 2.45 μmol m −2 s −1 were obtained from electrochemical measurements, ex situ solution analyses, and in situ SMI corrosion measurement, respectively . Finally, these experimental results validate the applicability of SMI for in situ nanoscale charact

关键词： Pitting

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A Hydraulic Soft Microhand with an Application of Live Insect Manipulation

Research Square

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Research Square 2021年

作者： Kordmahale, Sina Baghbani Qu, Jian Muliana, Anastasia Hanifah Kameoka, Jun Department of Electrical Engineering and Computer Science Texas A&M University College StationTX United States Department of Material Science Texas A&M University College StationTX United States Department of Mechanical Engineering Texas A&M University College StationTX United States

We have developed micro scale hydraulic/pneumatic soft grippers and demonstrated the handling of an insect. These grippers are built on Polydimethylsiloxane (PDMS) with the soft material casting technique to form three finger-like columns, which are placed on a circular membrane. The fingers have a length of 1.5mm/2mm and a diameter of 300µm each;the distance between two fingers is 600µm of center-to-center distance. Membrane is built as a 150µm soft skin on the top of a cylindrical void. Applying a pressure difference between the interior of the void and the exterior can bend the membrane. Bending the membrane causes the motion of opening/closing of the gripper, and as a result, the three fingers can grip an object or release it. The PDMS was characterized and the experimental results were used later in Abaqus software to simulate the gripping motion. The produced force and range of deformation of the grippers were investigated by simulation and experiment. The results of the simulation agrees with the experiments. The maximum 543 µN force was measured for the microfluidic compatible *** this microhand gripper, the an ant was manipulated successfully without any damage. Results showed fabricated devices have great potential as a micro/bio manipulator. © 2021, CC BY.

关键词： Grippers

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Very High Parallel-Plane Surface Electric Field of 4.3 MV/cm in Ga2O3 Schottky Barrier Diodes with PtOx Contacts

Very High Parallel-Plane Surface Electric Field of 4.3 MV/cm...

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Device Research Conference

作者： Devansh Saraswat Wenshen Li Kazuki Nomoto Debdeep Jena Huili Grace Xing Department of Material Science and Engineering Cornell University Ithaca NY USA School of Electrical and Computer Engineering Cornell University Ithaca NY USA

ISBN: (数字)9781728170473

ISBN: (纸本)9781728170480

β-Ga 2 O 3 has emerged as a potentially-disruptive wide-bandgap semiconductor material for high power applications, largely due to its high breakdown electric field of ~8 MV/cm. To access the full benefit of Ga 2 O 3 , a high electric field close to the breakdown field should be sustained in devices under reverse blocking. This is a challenging task, especially given the fact that functional p-n homojunctions might never be feasible in Ga 2 O 3 . As a result, alternative reverse blocking junctions, such as Schottky barriers [1] , p-n heterojunctions [2] and MIS-structures with high-k dielectrics [3] are being investigated. Among them, Schottky barriers have highly-desirable advantages, including less stringent requirements on the interface quality compared to p-n heterojunctions, as well as an absence of reliability concerns - an issue in dielectrics.

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Untrained, Physics-Informed Neural Networks for Structured Illumination Microscopy

arXiv

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arXiv 2022年

作者： Burns, Zachary Liu, Zhaowei Department of Electrical and Computer Engineering University of California San Diego 9500 Gilman Drive La Jolla CA92093 United States Material Science and Engineering Program University of California San Diego 9500 Gilman Drive La Jolla CA92093 United States Center for Memory and Recording Research University of California San Diego 9500 Gilman Drive La Jolla CA92093 United States

In recent years there has been great interest in using deep neural networks (DNN) for super-resolution image reconstruction including for structured illumination microscopy (SIM). While these methods have shown very promising results, they all rely on data-driven, supervised training strategies that need a large number of ground truth images, which is experimentally difficult to realize. Additionally, such trained methods are prone to overfitting and often fail to generalize well to data that is out of the training distribution making them unsuitable as tools of discovery. For SIM imaging, there exists a need for a flexible, general, and open-source reconstruction method that can be readily adapted to different forms of structured illumination. We demonstrate that we can combine a deep neural network with the forward model of the structured illumination process to reconstruct sub-diffraction images without training data. The resulting physics-informed neural network (PINN) can be optimized on a single set of diffraction limited sub-images and thus doesn’t require any training set. We show with simulated and experimental data that this PINN can be applied to a wide variety of SIM methods by simply changing the known illumination patterns used in the loss function and can achieve resolution improvements that match well with theoretical expectations. © 2022, CC BY.

关键词： Deep neural networks

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Nonreciprocal dynamics of ferrimagnetic bimerons

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Physical Review B 2022年第1期105卷 014422-014422页

作者： Laichuan Shen Jing Xia Zehan Chen Xiaoguang Li Xichao Zhang Oleg A. Tretiakov Qiming Shao Guoping Zhao Xiaoxi Liu Motohiko Ezawa Yan Zhou School of Science and Engineering Chinese University of Hong Kong Shenzhen Guangdong 518172 China College of Physics and Electronic Engineering Sichuan Normal University Chengdu 610068 China Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong 999077 China Department of Physics Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong 999077 China Center for Advanced Material Diagnostic Technology College of Engineering Physics Shenzhen Technology University Shenzhen 518118 China Department of Electrical and Computer Engineering Shinshu University 4-17-1 Wakasato Nagano 380-8553 Japan School of Physics University of New South Wales Sydney 2052 Australia National University of Science and Technology “MISIS” Moscow 119049 Russia Guangdong–Hong Kong–Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology Hong Kong University of Science and Technology Hong Kong 999077 China Department of Applied Physics University of Tokyo 7-3-1 Hongo Tokyo 113-8656 Japan

Magnetic bimerons are topologically nontrivial spin textures in in-plane easy-axis magnets, which can be used as particle-like information carriers. Here, we report a theoretical study on the nonreciprocal dynamics of asymmetrical ferrimagnetic (FiM) bimerons induced by spin currents. The FiM bimerons have the ability to move at a speed of kilometers per second and do not show the skyrmion Hall effect at the angular momentum compensation point. Our micromagnetic simulations and analytical results demonstrate that spin currents are able to induce the nonreciprocal transport and a drift motion of the FiM bimeron even if the system is at the angular momentum compensation point. By analyzing the current-induced effective fields, we find that the nonreciprocal transport is attributed to the asymmetry of the bimeron structure. Our results are useful for understanding the physics of bimerons in ferrimagnets and may provide guidelines for building bimeron-based spintronic devices.

关键词： Ferrimagnetism Skyrmions Spin texture Ultrafast magnetization dynamics

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Two-step electronic response to magnetic ordering in a van der Waals ferromagnet

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Physical Review B 2024年第4期109卷 045416-045416页

作者： Han Wu Jian-Xin Zhu Lebing Chen Matthew W. Butcher Ziqin Yue Dongsheng Yuan Yu He Ji Seop Oh Bin Gao Jianwei Huang Shan Wu Cheng Gong Yucheng Guo Sung-Kwan Mo Jonathan Denlinger Donghui Lu Makoto Hashimoto Matthew B. Stone Alexander I. Kolesnikov Songxue Chi Junichiro Kono Andriy H. Nevidomskyy Robert J. Birgeneau Pengcheng Dai Ming Yi Department of Physics and Astronomy and Rice Center for Quantum Materials Rice University Houston Texas 77005 USA Theoretical Division Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Center for Integrated Nanotechnologies Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Department of Physics University of California at Berkeley Berkeley California 94720 USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston Texas 77005 USA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA National Institute for Materials Science 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan Department of Applied Physics Yale University New Haven Connecticut 06511 USA Department of Electrical and Computer Engineering and Quantum Technology Center University of Maryland College Park Maryland 20742 USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo Park California 94025 USA Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Electrical and Computer Engineering Rice University Houston Texas 77005 USA Smalley-Curl Institute Rice University Houston Texas 77005 USA Department of Material Science and Nanoengineering Rice University Houston Texas 77005 USA Department of Materials Science and Engineering University of California Berkeley California 94720 USA

The two-dimensional material Cr2Ge2Te6 is a member of the class of insulating van der Waals (vdW) magnets. Here, using high resolution angle-resolved photoemission spectroscopy in a detailed temperature dependence study, we identify a clear response of the electronic structure to a dimensional crossover in the form of two distinct temperature scales marking onsets of modifications in the electronic structure. Specifically, we observe Te p-orbital-dominated bands to undergo changes at the Curie transition temperature TC while the Cr d-orbital-dominated bands begin evolving at a higher temperature scale. Combined with neutron scattering, density functional theory calculations, and Monte Carlo simulations, we find that the electronic system can be consistently understood to respond sequentially to the distinct temperatures at which in-plane and out-of-plane spin correlations exceed a characteristic length scale. Our findings reveal the sensitivity of the orbital-selective electronic structure for probing the dynamical evolution of local moment correlations in vdW insulating magnets.

关键词： Electronic structure Magnetic order Magnetic phase transitions Van der Waals systems Angle-resolved photoemission spectroscopy

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Photonic real time video image signal processor at 17Tb/s based on a Kerr microcomb

arXiv

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arXiv 2024年

作者： Tan, Mengxi Xu, Xingyuan Boes, Andreas Corcoran, Bill Nguyen, Thach G. Chu, Sai T. Little, Brent E. Morandotti, Roberto Wu, Jiayang Mitchell, Arnan Moss, David J. School of Electronic and Information Engineering Beihang University Beijing100191 China Optical Sciences Centre Swinburne University of Technology HawthornVIC3122 Australia School of Engineering RMIT University MelbourneVIC3001 Australia State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China School of Electrical and Electronic Engineering University of Adelaide Adelaide5005 SA Australia Department of Electrical and Computer System Engineering Monash University ClaytonVIC3168 Australia Department of Physics and Material Science City University of Hong Kong Tat Chee Avenue Hong Kong Xi’an Institute of Optics and Precision Mechanics CAS Xi’an China INRS-Énergie Matériaux et Télécommunications 1650 Boulevard Lionel-Boulet VarennesQCJ3X 1S2 Canada

Signal processing has become central to many fields, from coherent optical telecommunications, where it is used to compensate signal impairments, to video image processing. Image processing is particularly important for observational astronomy, medical diagnosis, autonomous driving, big data and artificial intelligence. For these applications, signal processing traditionally has mainly been performed electronically. However these, as well as new applications, particularly those involving real time video image processing, are creating unprecedented demand for ultrahigh performance, including high bandwidth and reduced energy consumption. Here, we demonstrate a photonic signal processor operating at 17 Terabits/s and use it to process video image signals in real-time. The system processes 400,000 video signals concurrently, performing 34 functions simultaneously that are key to object edge detection, edge enhancement and motion blur. As compared with spatial-light devices used for image processing, our system is not only ultra-high speed but highly reconfigurable and programable, able to perform many different functions without any change to the physical hardware. Our approach is based on an integrated Kerr soliton crystal microcomb, and opens up new avenues for ultrafast robotic vision and machine learning. © 2024, CC BY.

关键词： Energy utilization

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Electrocatalytic on-site oxygenation for transplanted cell-based-therapies

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Nature Communications 2023年第1期14卷 7019页

作者： Lee, Inkyu Surendran, Abhijith Fleury, Samantha Gimino, Ian Curtiss, Alexander Fell, Cody Shiwarski, Daniel J. Refy, Omar Rothrock, Blaine Jo, Seonghan Schwartzkopff, Tim Mehta, Abijeet Singh Wang, Yingqiao Sipe, Adam John, Sharon Ji, Xudong Nikiforidis, Georgios Feinberg, Adam W. Hester, Josiah Weber, Douglas J. Veiseh, Omid Rivnay, Jonathan Cohen-Karni, Tzahi Department of Materials Science and Engineering Carnegie Mellon University Pittsburgh PA United States Department of Biomedical Engineering Northwestern University Evanston IL United States Department of Bioengineering Rice University Houston TX United States Department of Chemical Engineering Carnegie Mellon University Pittsburgh PA United States Department of Electrical and Computer Engineering Northwestern University Evanston IL United States Department of Biomedical Engineering Carnegie Mellon University Pittsburgh PA United States Department of Physics Carnegie Mellon University Pittsburgh PA United States Department of Computer Science Northwestern University Evanston IL United States Department of Material Science and Engineering The Pennsylvania State University State College PA United States Neuroscience Institute Carnegie Mellon University Pittsburgh PA United States Simpson Querrey Institute Northwestern University Chicago IL United States Interactive Computing and Computer Science Georgia Institute of Technology Atlanta GA United States Department of Mechanical Engineering Carnegie Mellon University Pittsburgh PA United States Department of Materials Science and Engineering Northwestern University Evanston 60208 IL United States

Implantable cell therapies and tissue transplants require sufficient oxygen supply to function and are limited by a delay or lack of vascularization from the transplant host. Previous exogenous oxygenation strategies have been bulky and had limited oxygen production or regulation. Here, we show an electrocatalytic approach that enables bioelectronic control of oxygen generation in complex cellular environments to sustain engineered cell viability and therapy under hypoxic stress and at high cell densities. We find that nanostructured sputtered iridium oxide serves as an ideal catalyst for oxygen evolution reaction at neutral pH. We demonstrate that this approach exhibits a lower oxygenation onset and selective oxygen production without evolution of toxic byproducts. We show that this electrocatalytic on site oxygenator can sustain high cell loadings (>60k cells/mm³) in hypoxic conditions in vitro and in vivo. Our results showcase that exogenous oxygen production devices can be readily integrated into bioelectronic platforms, enabling high cell loadings in smaller devices with broad applicability. © 2023, The Author(s).

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Role of surface functionality and polyamic acid in carbon fiber/PEI interface 7

Role of surface functionality and polyamic acid in carbon fi...

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7th Composites and Advanced materials Expo, CAMX 2020

作者： Kubota, Munetaka Deitzel, Joseph M. Gillespie, John W. University of Delaware Center for Composite Materials NewarkDE19716 United States University of Delaware Department of Material Science and Engineering DE United States University of Delaware Department of Mechanical Engineering DE United States University of Delaware Department of Civil and Environmental Engineering DE United States University of Delaware Department of Electrical and Computer Engineering DE United States

The promise of chemical resistance, high toughness, recyclability, and fast cycle times have reignited the interest in fiber-reinforced thermoplastics. To fully realize the synergistic effects of fiber-reinforced composites, the fiber/matrix interface becomes critical. Fiber manufacturers apply a sizing package to protect the fibers from damage during handling and weaving, but also include adhesion-promoting coupling agents onto fibers designed for thermosetting resins such as epoxy. Analogous coupling agent options become scarce since many of the organic oligomers used for adhesion promotion degrade at the high processing temperatures of the engineering thermoplastics such as polyetherimide (PEI) or polyether ether ketone (PEEK). Furthermore, unlike thermosetting resins, which have an opportunity to covalently bond to the coupling agent, the mechanism to improve the fiber/thermoplastic interface is unclear. This work investigates the role of the surface functionality and polyamic acid in improving carbon fiber/PEI interface employing the single fiber fragmentation test (SFFT). Surface functionalization was done using a thermal oxidation technique, and polyamic acid was selected for its ability to imidizes at the process temperature of PEI. The interfacial shear strength was increased by about 20% with a combination of surface functionalization and a coating of polyamic acid. © 2020. CAMX – The Composites and Advanced materials Expo.

关键词： Ketones

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Game and simulation design for studying pedestrian-automated vehicle interactions

arXiv

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arXiv 2021年

作者： Pappas, Georgios Siegel, Joshua E. Rutkowski, Jacob Schaaf, Andrea Department of Electrical and Computer Engineering Michigan State University East LansingMI48824 United States Department of Electrical and Computer Engineering National Technical University of Athens Athens Greece Lab of Educational Material and Methodology Open University of Cyprus Nicosia Cyprus Department of Computer Science and Engineering Michigan State University East LansingMI48824 United States Department of Communication Michigan State University East LansingMI48824 United States

The present cross-disciplinary research explores pedestrian-autonomous vehicle interactions in a safe, virtual environment. We first present contemporary tools in the field and then propose the design and development of a new application that facilitates pedestrian point of view research. We conduct a three-step user experience experiment where participants answer questions before and after using the application in various scenarios. Behavioral results in virtuality, especially when there were consequences, tend to simulate real life sufficiently well to make design choices, and we received valuable insights into human/vehicle interaction. Our tool seemed to start raising participant awareness of autonomous vehicles and their capabilities and limitations, which is an important step in overcoming public distrust of AVs. Further, studying how users respect or take advantage of AVs may help inform future operating mode indicator design as well as algorithm biases that might support socially-optimal AV operation. Copyright © 2021, The Authors. All rights reserved.

关键词： Autonomous vehicles

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