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International Electron Devices Meeting (IEDM)

作者： T. S. Nguyen K. Nomoto W. Zhao C. Savant H. G. Xing D. Jena Department of Materials Science and Engineering Cornell University Ithaca NY USA School of Electrical and Computer Engineering Cornell University Ithaca NY USA School of Applied and Engineering Physics Cornell University Ithaca NY USA Kavli Institute at Cornell for Nanoscale Science Cornell University Ithaca NY USA

ISBN: (数字)9798350365429

ISBN: (纸本)9798350365436

We report the effect of scaling the gate length from 0.8 µm to 40 nm on the performance of novel strain-balanced AlScN/GaN high electron mobility transistors (HEMTs) on SiC substrates. A new strain-balanced heterostructure is introduced where the tensile strain of the AlN interlayer is balanced by the compressive strain in the AlScN barrier layer. MBE regrown source/drain ohmics with ultralow contact resistance of 0.09 Ω·mm allow a low HEMT on resistance of 0.83 Ω·mm. The shortest gate length AlScN/GaN HEMTs exhibit maximum drain currents of 2.8 A/mm, peak transconductance of 0.55 S/mm, and speed characterized by $f_{T}$ / $f_{MAX}$ of 173/321 GHz. The highest $f_{MAX}$ obtained here is ~2X higher than previous AlScN HEMTs.

关键词： Resistance Tensile strain Silicon carbide HEMTs Logic gates MODFETs III-V semiconductor materials Electron devices Transconductance Substrates

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Annotating TSSs in Multiple Cell Types Based on DNA Sequence and RNA-seq Data via DeeReCT-TSS

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Genomics, Proteomics & Bioinformatics 2022年第5期20卷 959-973页

作者： Juexiao Zhou Bin Zhang Haoyang Li Longxi Zhou Zhongxiao Li Yongkang Long Wenkai Han Mengran Wang Huanhuan Cui Jingjing Li Wei Chen Xin Gao Computer Science Program ComputerElectrical and Mathematical Sciences and Engineering DivisionKing Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia Computational Bioscience Research Center King Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia Department of Biology School of Life SciencesSouthern University of Science and TechnologyShenzhen 518055China Shenzhen Key Laboratory of Gene Regulation and Systems Biology School of Life SciencesSouthern University of Science and TechnologyShenzhen 518055China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China

The accurate annotation of transcription start sites(TSSs)and their usage are critical for the mechanistic understanding of gene regulation in different biological *** fulfill this,specific high-throughput experimental technologies have been developed to capture TSSs in a genome-wide manner,and various computational tools have also been developed for in silico prediction of TSSs solely based on genomic *** of these computational tools cast the problem as a binary classification task on a balanced dataset,thus resulting in drastic false positive predictions when applied on the genome ***,we present Dee Re CT-TSS,a deep learningbased method that is capable of identifying TSSs across the whole genome based on both DNA sequence and conventional RNA sequencing *** show that by effectively incorporating these two sources of information,Dee Re CT-TSS significantly outperforms other solely sequence-based methods on the precise annotation of TSSs used in different cell ***,we develop a meta-learning-based extension for simultaneous TSS annotations on 10 cell types,which enables the identification of cell type-specific ***,we demonstrate the high precision of DeeReCT-TSS on two independent datasets by correlating our predicted TSSs with experimentally defined TSS chromatin *** source code for Dee Re CT-TSS is available at https://github.-com/Joshua Chou2018/Dee Re CT-TSS_release and https://***/biocode/tools/BT007316.

关键词： Transcription start site Machine learning Deep learning Meta-learning RNA sequencing

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Real-time Nonlinear Pulse Evolution Dynamics in a Tm-doped Fiber Laser

Real-time Nonlinear Pulse Evolution Dynamics in a Tm-doped F...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Shutao Xu Junjie Zeng Michelle Y. Sander Department of Electrical and Computer Engineering and BU Photonics Center Boston University Boston Massachusetts USA Division of Materials Science and Engineering Boston University Brookline Massachusetts USA Department of Biomedical Engineering Boston University Boston Massachusetts USA

We investigate the nonlinear pulse evolution dynamics in a Tm-doped fiber laser in real-time with a modified dispersive Fourier transform technique. Coherence degradation and recovery processes are analyzed with spect... 详细信息

ISBN: (纸本)9781957171258

关键词： Coherent states Dissipative solitons Fourier transforms Laser sources Thulium doped fiber lasers Ultrafast lasers

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Molecular-Functionalized Metal-Organic Frameworks Enabling Tribocatalytic Organic Decomposition

SSRN

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SSRN 2023年

作者： Zhang, Yihe Kang, Tian Han, Xin Yang, Weifeng Gong, Wei Li, Kerui Guo, Yinben School of Materials Science and Engineering Shanghai University of Engineering Science Shanghai201620 China State Key Laboratory of Chemical Engineering School of Chemical Engineering East China University of Science and Technology Shanghai200237 China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai201620 China Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore117583 Singapore

Metal-organic frameworks (MOFs) have been used in triboelectric areas for either improving the outputs or expanding some novel applications. However, research on the effects of the grafted groups of MOFs molecular to triboelectricity remains scarce. Here, we modified the MIL-101(Cr) with three groups (pyridine, amino, nitro) to obtain a series of X-MOFs (X=-PY, -NH2 and -NO2) and clarified their position in triboelectric series. The great electron-donating ability of pyridine granted PY-MOF positive tribopolarity and effectively improved the power density by 9.6 times. Moreover, PY-MOF was proved as significant tribocatalytic material with degradation rate of 97% in 3 h via degradation of methylene blue (MB) dye in aqueous environment. This work shows that the modification of MOF molecular with functional groups can modulate the triboelectric properties of MOFs for largely improving the output performance and show great application prospects in the field of tribo-catalysis. © 2023, The Authors. All rights reserved.

关键词： Nanogenerators

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Standardization of Core and Component Characterization at the Advanced Magnetics for Power and Energy Development Laboratory

Standardization of Core and Component Characterization at th...

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IEEE Transportation Electrification Conference and Expo (ITEC)

作者： Chris Bracken Richard Beddingfield Mark A. Juds Bharadwaj Reddy Andapally Brandon Grainger Paul R. Ohodnicki Department of Mechanical Engineering and Materials Science University of Pittsburgh Pittsburgh United States Department of Electrical and Computer Engineering North Carolina State University Raleigh United States Companhia Brasileira de Metalurgia e Mineração (CBMM) Flevoland Netherlands Department of Electrical and Computer Engineering University of Pittsburgh Pittsburgh United States

Magnetic core and component characterization presents technical challenges, particularly with a focus on achieving higher frequency and voltage operation with advances in power electronics converters due to wide bandgap semiconductors. Accurate characterization plays a critical role in benchmarking the performance of existing core materials and construction for various component designs. In addition, characterization of fabricated components with application relevant excitation is critical for accurate assessment of technical figures of merit. Standardization of core and component characterization plays a foundational role in benchmarking and quantifying performance improvement of new magnetic materials, core constructions, and component designs. In this article, we discuss existing standards relevant for magnetic core characterization and several new standard development activities currently underway relevant for medium frequency and power applications. We also discuss the application of relevant measurements to selected magnetic core materials and components currently active within the Advanced Magnetics for Power and Energy Development (AMPED) Consortium. Example current transformer components are designed and tested as an example of standardized testing that is currently underway, to be expanded in the future to also include inductors and transformers amongst others.

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Low-power Rapid Planar Superconducting Logic Devices

arXiv

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arXiv 2024年

作者： Gusarov, Nikolay Mandal, Rajesh Salameh, Issa Holzman, Itamar Kvatinsky, Shahar Ivry, Yachin Department of Materials Science and Engineering Technion - Israel Institute of Technology Haifa3200003 Israel Solid State Institute Technion – Israel Institute of Technology Haifa3200003 Israel Andrew and Erna Viterbi Faculty of Electrical and Computer Engineering Technion - Israel Institute of Technology Haifa3200003 Israel Department of Materials Science and Engineering University of California BerkeleyCA94720 United States

The rapid-pace growing demand for high-performance computation and big-data manipulation entails substantial increase in global power consumption, and challenging thermal management. Thus, there is a need in allocating competitive alternatives for complementary metal-oxide-semiconductor (CMOS) technologies. Superconducting platforms, such as rapid single flux quantum (RSFQ) lack electric resistance and excel in power efficiency and time performance. However, traditional RSFQs require 3D geometry for their Josephson junctions (JJs) imposing a large footprint, and hence preventing device miniaturization and increasing processing time. Here, we demonstrate that RSFQ logic circuits of planar geometry with weak-link bridges are scalable, relatively easy to process and are CMOS-compatible on a Si chip. Universal logic gates, as well as combinational arithmetic circuiting that are based on these devices are demonstrated. The power consumption and processing time of these logic circuits were as low as 0.8 nW and 13 ps, an order of magnitude improvement with respect to the equivalent traditional-RSFQ logic circuits and two orders of magnitude with respect to CMOS. The competitive performance of planar RSFQ logic circuits renders them for promising CMOS substitutes, especially in the supercomputational realm. © 2024, CC BY.

关键词： CMOS integrated circuits

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Low-Crosstalk in 2D Waveguide Crossings by Metaheuristic Optimization Methods

Low-Crosstalk in 2D Waveguide Crossings by Metaheuristic Opt...

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Optics and Photonics Conference (SBFoton IOPC), SBFoton International

作者： Luana da França Vieira C. E. Rubio-Mercedes Vitaly Felix Rodriguez Esquerre Department of Computer Science Federal University of Western Bahia Barreiras Brazil Physics Engineering Program State University of Mato Grosso do Sul Dourados Brazil Graduate School of Electrical Engineering Federal University of Bahia Salvador Brazil

ISBN: (数字)9798350388176

ISBN: (纸本)9798350388183

This work describes the investigation of planar waveguide crossings using metaheuristic methods associated with the two-dimensional finite element method (2D-FEM). An optimization and measurement process are performed on the power transmission and crosstalk of the waveguide crossings and then the values calculated are compared with other studies in the literature. The best performing adjusted crossing is optimally designed by applying the following metaheuristics: Particle Swarm Optimization (PSO), Grey Wolf Optimizer (GWO), and a hybrid algorithm combining the Greedy Randomized Adaptive Search Procedure and Simulated Annealing (GRASP-SA). Transmission efficiency results higher than 97% and crosstalk below the -50 dB over a wide wavelength range, with a footprint of $\mathbf{4.9}\times \mathbf{4.9}\ \boldsymbol{\mu} \mathbf{m}^{\mathbf{2}}$ .

关键词： Performance evaluation Power measurement Metaheuristics Crosstalk Power transmission Simulated annealing Silicon Planar waveguides Optical waveguides Photonics

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Shear strain alters the structure and migration mechanism of self-interstitial atoms in copper

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Physical Review materials 2022年第5期6卷 053605-053605页

作者： B. Zhang C. Wheatley P. Chen X. Qian M. J. Demkowicz Department of Materials Science and Engineering Texas A&M University College Station Texas 77845 USA Department of Materials Science and Engineering Penn State University State College Pennsylvania 16801 USA Key Laboratory of Automobile Materials of Ministry of Education School of Materials Science and Engineering Jilin University Changchun People's Republic of China Department of Electrical and Computer Engineering Texas A&M University College Station Texas 77845 USA

We use atomistic modeling to show that externally applied shear strain causes the lowest energy self-interstitial atom (SIA) structure in copper (Cu) to change from a ⟨100⟩-type dumbbell to a ⟨110⟩-type dumbbell. Concurrently, SIA migration switches from the three-dimensional (3D) random walk characteristic of ⟨100⟩-type dumbbells to a 1D mechanism analogous to that of crowdion SIAs. Furthermore, the relative energies of these two dumbbell structures as a function of strain are well predicted using elastic dipole tensors computed at zero strain, indicating that examination of these tensors may be used to assess the likelihood of strain-induced SIA structure transitions in other materials. Changes in lowest energy SIA structures and associated migration mechanisms stand to impact predictions of SIA behavior in irradiated solids.

关键词： Interstitials Face-centered cubic Transition metals Density functional calculations

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Monolithically integrated Fourier Injected REsonator (FIRE) for coherent beam combining

Monolithically integrated Fourier Injected REsonator (FIRE) ...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Lance Sweatt Siwei Zeng Xiaolei Zhao Christopher J. Corcoran Lin Zhu Department of Electrical and Computer Engineering Center for Optical Materials Science and Engineering Technologies Clemson University Clemson SC Corcoran Engineering Inc.

An on-chip FIRE resonator, consisting of an angled laser array monolithically integrated with a slab waveguide propagation region, is experimentally demonstrated for coherent beam combining with the increased supermod... 详细信息

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Waveguide lasers Lasers and electrooptics Propagation losses System-on-chip Laser beams Laser applications Slabs

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Impact of fabrication methods on binder distribution and charge transport in composite cathodes of all-solid-state batteries

材料展望（英文）

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材料展望（英文） 2023年第4期 121-129页

作者： Benjamin Emley Chaoshan Wu Lihong Zhao Qing Ai Yanliang Liang Zhaoyang Chen Liqun Guo Tanguy Terlier Jun Lou Zheng Fan Yan Yao Materials Science and Engineering Program and Texas Center for Superconductivity at the University of Houston University of Houston4726 Calhoun RdHoustonTX 77204United States of America Materials Science and Engineering Program and Texas Center for Superconductivity at the University of Houston University of Houston4726 Calhoun RdHoustonTX 77204United States of America Department of Electrical and Computer Engineering University of Houston4726 Calhoun RdHoustonTX 77204United States of America Department of Materials Science and Nano Engineering Rice University6100 Main StreetHoustonTX 77005United States of America SIMS Laboratory Shared Equipment AuthorityRice UniversityHoustonTX 77005United States of America Department of Engineering Technology University of HoustonHoustonTX 77204United States of America

The manufacturing process of all-solid-state batteries necessitates the use of polymer ***,these binders,being ionic insulators by nature,can adversely affect charge transport within composite cathodes,thereby impacting the rate performance of the *** this work,we aim to investigate the impact of fabrication methods,specifically the solvent-free dry process versus the slurry-cast wet process,on binder distribution and charge transport in composite cathodes of solid-state *** the dry process,the binder forms a fibrous network,while the wet process results in binder coverage on the surface of cathode active *** difference in microstructure leads to a notable 20-fold increase in ionic conductivity in the dry-processed ***,the cells processed via the dry method exhibit higher capacity retention of 89％and 83％at C/3 and C/2 rates,respectively,in comparison to 68％and 58％for the wet-processed cells at the same *** findings provide valuable insights into the influence of fabrication methods on binder distribution and charge transport,contributing to a better understanding of the binder's role in manufacturing of all-solid-state batteries.

关键词： solid-state battery solvent-free dry process polymer binder lithium thiophosphate electrolyte

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