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MetaMOPE: a web service for mobile phase determination and fast chromatography peaks evaluation for metabolomics

Bioinformatics Advances 2023年第1期3卷

作者： Tsai, Dong-Ming Chang, Ching-Yao Lin, Shih-Ming Kuo, Tien-Chueh Wang, San-Yuan Chen, Guan-Yuan Kuo, Ching-Hua Tseng, Yufeng Jane Graduate Institute of Biomedical Electronics and Bioinformatics National Taiwan University Taipei 106216 Taiwan The Metabolomics Core Laboratory Centers of Genomic and Precision Medicine National Taiwan University Taipei 100225 Taiwan Department of Computer Science and Information Engineering National Taiwan University Taipei 106216 Taiwan Master Program for Clinical Pharmacogenomics and Pharmacoproteomics School of Pharmacy Taipei Medical University Taipei 110301 Taiwan Forensic Medicine College of Medicine National Taiwan University Taipei 100225 Taiwan School of Pharmacy College of Medicine National Taiwan University Taipei 100225 Taiwan

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Shot noise in a strange metal

arXiv

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arXiv 2022年

作者： Chen, Liyang Lowder, Dale T. Bakali, Emine Andrews, Aaron Maxwell Schrenk, Werner Waas, Monika Svagera, Robert Eguchi, Gaku Prochaska, Lukas Wang, Yiming Setty, Chandan Sur, Shouvik Si, Qimiao Paschen, Silke Natelson, Douglas Applied Physics Graduate Program Rice University 6100 Main St. HoustonTX77005 United States Department of Physics and Astronomy Rice Center for Quantum Materials Rice University 6100 Main St. HoustonTX77005 United States Institute of Solid State Physics TU Wien Wiedner Hauptstraße 8-10 Vienna1040 Austria Institute of Solid State Electronics TU Wien Gußhausstraße 25-25a Gebäude CH Vienna1040 Austria Center for Micro and Nanostructures TU Wien Gußhausstraße 25-25a Gebäude CH Vienna1040 Austria Department of Electrical and Computer Engineering Rice University 6100 Main St. HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University 6100 Main St. HoustonTX77005 United States

Strange-metal behavior has been observed in materials ranging from high-temperature superconductors to heavy fermion metals. In conventional metals, current is carried by quasiparticles;although it has been suggested that quasiparticles are absent in strange metals, direct experimental evidence is lacking. We measured shot noise to probe the granularity of the current-carrying excitations in nanowires of the heavy fermion strange metal YbRh2Si2. When compared with conventional metals, shot noise in these nanowires is strongly suppressed. This suppression cannot be attributed to either electron-phonon or electron-electron interactions in a Fermi liquid, which suggests that the current is not carried by well-defined quasiparticles in the strange-metal regime that we probed. Our work sets the stage for similar studies of other strange metals. Copyright © 2022, The Authors. All rights reserved.

关键词： Nanowires

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Front Cover: From Textile Coloring to Light-emitting Electrochemical Devices: Upcycling of the Isoviolanthrone Vat Dye (Chem. Asian J. 6/2023)

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Chemistry – An Asian Journal 2023年第6期18卷

作者： Tatiana Ghanem Kwang Keat Leong Hwandong Jang Alexis Hardouin Dr. Philippe Blanchard Prof. Dominik Lungerich Dr. Pierre Josse Prof. Eunkyoung Kim Dr. Clément Cabanetos University of Angers CNRS MOLTECH-ANJOU SFR MATRIX F-49000 Angers France Department of Chemical and Biomolecular Engineering Yonsei University 50 Yonsei-ro Seodaemun-gu 03722 Seoul South Korea Center for Nanomedicine (CNM) Institute for Basic Science (IBS) IBS Hall 50 Yonsei-ro Seodaemun-gu 03722 Seoul South Korea Graduate Program of Nano Biomedical Engineering (NanoBME) Advanced Science Institute Yonsei University 50 Yonsei-ro Seodaemun-gu 03722 Seoul South Korea Building Blocks for FUture Electronics Laboratory (2BFUEL) IRL2002 CNRS-Yonsei University Seodaemun-gu 03722 Seoul South Korea

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Power Routing to Enhance the Lifetime of Multiphase Drives

Power Routing to Enhance the Lifetime of Multiphase Drives

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IEEE Energy Conversion Congress and Exposition

作者： Victor N. Ferreira Rodrigo R. Bastos Tamires S. de Souza Marco Liserre Braz J. Cardoso Filho Chair of Power Electronics Christian-Albrechts-Universität Kiel Germany Graduate Program in Electrical Engineering Universidade Federal de Minas Gerais Belo Horizonte MG Brazil Department of Electro Electronics Instituto Federal de Educação Gerais Brazil Electrical Engineering Department Universidade Federal de Minas Gerais Belo Horizonte MG Brazil

The unbalanced power operation of multiphase machines has been proposed for fault tolerance purpose. However, the higher number of phases, increases the complexity of its power converter. Therefore, design issues can generate thermal deviation among the devices, causing extra heating, and ultimately reducing the lifetime of the most stressed devices. This work proposes the power routing in multiphase drives to reduce the thermal stress of specific devices, increasing the system lifetime. In this strategy, the soft unbalanced operation of multiphase machines is explored, reducing power of the hotter phases and redistributed among the others. Finite element analysis (FEM) and other simulation results show that the strategy can be applied maintaining the same power level and magnetomotive force (MMF) of the balanced operation. A case study is conducted demonstrating the lifetime enhancement of inverters, when power routing is applied in industrial multiphase drives.

关键词： Routing Induction machines Degradation Current control Heating systems Force Reliability

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Guaranteed methods based on constrained zonotopes for set-valued state estimation of nonlinear discrete-time systems

arXiv

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arXiv 2019年

作者： Rego, Brenner S. Raffo, Guilherme V. Scott, Joseph K. Raimondo, Davide M. Graduate Program in Electrical Engineering Federal University of Minas Gerais Belo Horizonte MG 31270-901 Brazil Department of Electronics Engineering Federal University of Minas Gerais Belo Horizonte MG 31270-901 Brazil Department of Chemical and Biomolecular Engineering Clemson University ClemsonSC United States Department of Electrical Computer and Biomedical Engineering University of Pavia Italy

This paper presents new methods for set-valued state estimation of nonlinear discrete-time systems with unknown-but-bounded uncertainties. A single time step involves propagating an enclosure of the system states through the nonlinear dynamics (prediction), and then enclosing the intersection of this set with a bounded-error measurement (update). When these enclosures are represented by simple sets such as intervals, ellipsoids, parallelotopes, and zonotopes, certain set operations can be very conservative. Yet, using general convex polytopes is much more computationally demanding. To address this, this paper presents two new methods, a mean value extension and a first-order Taylor extension, for efficiently propagating constrained zonotopes through nonlinear mappings. These extend existing methods for zonotopes in a consistent way. Examples show that these extensions yield tighter prediction enclosures than zonotopic estimation methods, while largely retaining the computational benefits of zonotopes. Moreover, they enable tighter update enclosures because constrained zonotopes can represent intersections much more accurately than zonotopes. Copyright © 2019, The Authors. All rights reserved.

关键词： Enclosures

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Bi-directional Sub-60mV/dec, Hysteresis-Free, Reducing Onset Voltage and High Speed Response of Ferroelectric-AntiFerroelectric Hf0.25Zr0.75O2 Negative Capacitance FETs

Bi-directional Sub-60mV/dec, Hysteresis-Free, Reducing Onset...

引用

International Electron Devices Meeting (IEDM)

作者： M. H. Lee K.-T. Chen C.-Y. Liao G.-Y. Siang C. Lo H.-Y. Chen Y.-J. Tseng C.-Y. Chueh C. Chang Y.-Y. Lin Y.-J. Yang F.-C. Hsieh S. T. Chang M.-H. Liao K.-S. Li C. W. Liu Institute and Undergraduate Program of Electro-Optical Engineering National Taiwan Normal University Taipei Taiwan Department of Electrical Engineering National Chung Hsing University Taichung Taiwan Department of Mechanical Engineering National Taiwan University Taipei Taiwan Taiwan Semiconductor Research Institute Hsinchu Taiwan Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan

Being the first demonstration of quasi-antiferroelertic Hf 1-x Zr x O 2 (QAFE-HZO, Zr=75%) negative-capacitance (NC) FET with non-hysteretic bi-directional sub-60mV/dec (SS for =51mV/dec, SS rev =53mV/dec, ΔV T FE o...

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Nano functional neural interfaces

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Nano Research 2018年第10期11卷 5065-5106页

作者： Yongchen Wang Hanlin Zhu Huiran Yang Aaron D. Argall Lan Luan Chong Xie Liang Guo Department of Biomedical Engineering The Ohio State University Columbus 43210 USA Department of Biomedical Engineering The University of Texas at Austin Austin 78712 USA Department of Electrical and Computer Engineering The Ohio State University Columbus 43210 USA Key Laboratory of Flexible Electronics and Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing 211816 China Biomedical Sciences Graduate Program The Ohio State University Columbus 43210 USA Department of Neuroscience The Ohio State University Columbus 43210 USA

Engineered functional neural interfaces （fNIs） serve as essential abiotic-biotic transducers between an engineered system and the nervous system. They convert external physical stimuli to cellular signals in stimulation mode or read out biological processes in recording mode. Information can be exchanged using electricity, light, magnetic fields, mechanical forces, heat, or chemical signals. fNIs have found applications for studying processes in neural circuits from cell cultures to organs to whole organisms, fNI-facilitated signal transduction schemes, coupled with easily manipulable and observable external physical signals, have attracted considerable attention in recent years. This enticing field is rapidly evolving toward miniaturization and biomimicry to achieve long-term interface stability with great signal transduction efficiency. Not only has a new generation of neuroelectrodes been invented, but the use of advanced fNIs that explore other physical modalities of neuromodulation and recording has begun to increase. This review covers these exciting developments and applications of fNIs that rely on nanoelectrodes, nanotransducers, or bionanotransducers to establish an interface with the nervous system. These nano fNIs are promising in offering a high spatial resolution, high target specificity, and high communication bandwidth by allowing for a high density and count of signal channels with minimum material volume and area to dramatically improve the chronic integration of the fNI to the target neural tissue. Such demanding advances in nano fNIs will greatly facilitate new opportunities not only for studying basic neuroscience but also for diagnosing and treating various neurological diseases.

关键词： neural interface neurotechnology nanoelectrode nanomaterial neural recording neural stimulation

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GO synthesis of offset dual reflector antennas using local axis-displaced confocal quadrics

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Journal of Microwaves, Optoelectronics and Electromagnetic Applications 2020年第2期19卷 177-190页

作者： Assis, Aline R. Moreira, Fernando J. S. Bergmann, José R. Graduate Program in Electrical Engineering Federal University of Minas Gerais Av. Pres. Antonio Carlos 6627 Belo Horizonte MG31270-901 Brazil Department of Electronics Engineering Federal University of Minas Gerais Av. Pres. Antonio Carlos 6627 Belo Horizonte MG31270-901 Brazil Rua Marquês de São Vicente 225 Rio de Janeiro RJ22451-900 Brazil Departamento de Engenharia Elétrica Universidade Federal de Ouro Preto Rua Trinta e Seis 115 João Monlevade MG35931-008 Brazil

This work investigates an alternative numerical scheme for the solution of an exact formulation based on Geometrical Optics (GO) principles to synthesize offset dual reflector antennas. The technique is suited to solve a second-order nonlinear partial differential equation of the Monge-Ampère type as a boundary value problem. An iterative algorithm based on Newton's method was developed, using axis-displaced confocal quadrics to locally represent the subreflector surface, thus enabling an analytical description of the partial derivatives within the formulation. Such approach reduces discretization errors, as exact expressions for the mapping function and its derivatives are analytically determined. To check the robustness of the methodology, an offset dual-reflector Gregorian antenna was shaped to provide a Gaussian aperture field distribution with uniform phase within a superelliptical contour. The shaped surfaces were further interpolated by quintic pseudo-splines and analyzed by Physical Optics (PO) with equivalent edge currents to validate the synthesis procedure at 11,725 GHz. © 2020 SBMO/SBMag.

关键词： Geometrical optics

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A phase vocoder without requiring phase unwrapping

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on electronics, Information and Systems 2018年第4期138卷 352-359页

作者： Yoneguchi, Ryoichi Murakami, Takahiro Electrical Engineering Program Graduate School of Science and Technology Meiji University 1-1-1 Higashi-mita Tama-ku Kawasaki Kanagawa214-8571 Japan Department of Electronics and Bioinformatics School of Science and Technology Meiji University 1-1-1 Higashi-mita Tama-ku Kawasaki Kanagawa214-8571 Japan

In recent years, a number of algorithms for controlling parameters of an acoustic signal have been realized according as hardware technologies have been developed. A phase vocoder is one of the widely known methods for time scale modification (TSM) and pitch scale modification (PSM). The phase vocoder converts the length and the pitch of the acoustic signal by increasing or decreasing an instantaneous angular frequency. However, due to the phase unwrapping problem that occurs when the instantaneous angular frequency is estimated, the phase vocoder distorts the waveform of the modified signal. In order to alleviate this problem, we present a new algorithm for the phase vocoder. Our method does not encounter the phase unwrapping problem since we directly use the difference of phases between adjacent analysis frames to avoid estimating the instantaneous angular frequency. Moreover, our approach is effective even when the characteristics of the acoustic signal, e.g., a frequency and amplitude, change rapidly. © 2018 The Institute of Electrical Engineers of Japan.

关键词： Acoustic waves

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Hybrid Multiple-Active Bridge for Unequal Power Flow in Smart Transformers

Hybrid Multiple-Active Bridge for Unequal Power Flow in Smar...

引用

IEEE Energy Conversion Congress and Exposition

作者： Victor N. Ferreira Nimrod Vazquez Braz Cardoso Marco Liserre Chair of Power Electronics Christian-Albrechts-Universität zu Kiel Kiel Germany Tecnologico Nacional de Mexico Instituto Tecnologico de Celaya Celaya Mexico Graduate Program in Electrical Engineering Federal University of Minas Gerais Belo Horizonte Brazil

The Multiple-Active Bridge (MAB) converter has been proposed as an alternative to reduce the number of cells in the dc-dc stage of Smart Transformers (ST). Due to the higher number of bridges coupled to the same multi-winding transformer, a lower number of cells are necessary to reach the medium and low voltage demands (MV/LV). The MAB-based dc-dc stage of STs has the same power capability in direct and reverse power flow, because its composition is purely based on bidirectional bridges. Nevertheless, the ST operates most of the time in direct power, and only partial reverse power is typically occurring. Thereby, its reverse power capability is not fully explored, resulting in unnecessary extra costs. As a solution, this work proposes the Hybrid Multiple-Active Bridge (H-MAB) as a basic cell of modular dc-dc converters for unequal power flow applications. The H-MAB, mixes uni and bidirectional bridges in the same multi-winding transformer, being capable of providing a balanced partial reverse power flow, with a reduced number of active devices. Applied as a basic cells of the dc-dc stage of STs, it can save costs, and keep a balanced power and voltage on its MV stage. Simulation and experimental results are presented, to validate the proposed topology, analyzing its functionality, efficiency and impact on STs. In addition, it is carried out a case-study, showing that the H-MAB can considerably reduce the cost of STs, exploring its unequal power flow operation.

关键词： Multiple-Active Bridge DAB MAB dc-dc Modular Converters Smart Transformer Partial Power Flow Multi-winding Transformer

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