检索结果-内蒙古大学图书馆

Horizontal Transport in Ti3C2TxMXene for Highly Efficient Osmotic Energy Conversion from Saline-Alkali Environments

Angewandte Chemie 2024年第48期136卷

作者： Han Qian Puguang Peng Hongzhao Fan Zhe Yang Lixue Yang Prof. Yanguang Zhou Prof. Dan Tan Feiyao Yang Prof. Morten Willatzen Prof. Gehan Amaratunga Prof. Zhonglin Wang Prof. Di Wei Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 101400 People's Republic of China School of Nanoscience and Engineering University of Chinese Academy of Sciences Beijing 100049 People's Republic of China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong SAR People's Republic of China School of Advanced Materials and Nanotechnology Xidian University Xi'an 710126 People's Republic of China Zhejiang University—University of Illinois at Urbana Champagne Institute (ZJUI) and School of Information Science and Electronics Zhejiang University International Campus Haining China Electrical Engineering Division Dept. of Engineering University of Cambridge Cambridge CB3 0FA UK School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332 USA Beijing Key Laboratory of Micro-Nano Energy and Sensor Center for High-Entropy Energy and Systems Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 101400 People's Republic of China Centre for Photonic Devices and Sensors University of Cambridge 9 JJ Thomson Avenue Cambridge CB3 0FA UK

Osmotic energy from the ocean has been thoroughly studied, but that from saline-alkali lakes is constrained by the ion-exchange membranes due to the trade-off between permeability and selectivity, stemming from the unfavorable structure of nanoconfined channels, pH tolerance, and chemical stability of the membranes. Inspired by the rapid water transport in xylem conduit structures, we propose a horizontal transport MXene (H-MXene) with ionic sequential transport nanochannels, designed to endure extreme saline-alkali conditions while enhancing ion selectivity and permeability. The H-MXene demonstrates superior ion conductivity of 20.67 S m −1 in 1 M NaCl solution and a diffusion current density of 308 A m −2 at a 10-fold salinity gradient of NaCl solution, significantly outperforming the conventional vertical transport MXene (V-MXene). Both experimental and simulation studies have confirmed that H-MXene represents a novel approach to circumventing the permeability-selectivity trade-off. Moreover, it exhibits efficient ion transport capabilities, addressing the gap in saline-alkali osmotic power generation.

关键词： Ti3C2Tx MXene Osmotic Energy Nanoconfined Channels Horizontal Transport Saline-alkali Environments

来源：评论

学校读者我要写书评

暂无评论

Graph-adaptive nonlinear dimensionality reduction

arXiv

引用

arXiv 2018年

作者： Shen, Yanning Traganitis, Panagiotis A. Giannakis, Georgios B. Dept. of Electrical and Computer Engineering Digital Technology Center University of Minnesota MinneapolisMN55455 United States

In this era of data deluge, many signal processing and machine learning tasks are faced with high-dimensional datasets, including images, videos, as well as time series generated from social, commercial and brain network interactions. Their efficient processing calls for dimensionality reduction techniques capable of properly compressing the data while preserving taskrelated characteristics, going beyond pairwise data correlations. The present paper puts forth a nonlinear dimensionality reduction framework that accounts for data lying on known graphs. The novel framework encompasses most of the existing dimensionality reduction methods, but it is also capable of capturing and preserving possibly nonlinear correlations that are ignored by linear methods. Furthermore, it can take into account information from multiple graphs. The proposed algorithms were tested on synthetic as well as real datasets to corroborate their effectiveness. Copyright © 2018, The Authors. All rights reserved.

关键词： Machine learning

来源：评论

学校读者我要写书评

暂无评论

Terahertz dynamic aperture imaging at stand-off distances using a compressed sensing protocol

arXiv

引用

arXiv 2019年

作者： Augustin, S. Jung, P. Frohmann, S. Hübers, H.-W. Dept. of Phys. Humboldt-Univ. zu Berlin and the Inst. of Optical Sensor Syst. of the Ger. Aerosp. Ctr. Berlin Department of Electrical Engineering and Computer Science Technische Universität Berlin Institute of Optical Sensor Systems of the German Aerospace Center Berlin

In this text, results of a 0:35 terahertz (THz) dynamic aperture imaging approach are presented. The experiments use an optical modulation approach and a single pixel detector at a stand-off imaging distance of ≈1m. The optical modulation creates dynamic apertures of 5cm diameter with ≈2000 individually controllable elements. An optical modulation approach is used here for the first time at a large far-field distance, for the investigation of various test targets in a fieldof-view of 8 x 8cm. The results highlight the versatility of this modulation technique and show that this imaging paradigm is applicable even at large far-field distances. It proves the feasibility of this imaging approach for potential applications like stand-off security imaging or far field THz microscopy. Copyright © 2019, The Authors. All rights reserved.

关键词： Light modulators

来源：评论

学校读者我要写书评

暂无评论

Parallelization of a six degree of freedom entry vehicle trajectory simulation using openMP and openACC

Parallelization of a six degree of freedom entry vehicle tra...

引用

Modeling and Simulation Technologies Conference, 2018

作者： Green, Justin S. Williams, Robert Anthony Gutierrez, Julian Dept. of Mechanical and Aerospace Engineering NASA Langley Research Center University of Virginia CharlottesvilleVA22903 United States Atmospheric Flight and Entry Systems Branch NASA Langley Research Center HamptonVA23681 United States Dept. of Mathematics and Statistics NASA Langley Research Center Old Dominion University NorfolkVA23529 United States High Performance Computing Incubator and Atmospheric Flight and Entry Systems Branch NASA Langley Research Center HamptonVA23681 United States Dept. of Electrical and Computer Engineering Northeastern University BostonMA02115 United States

ISBN: (数字)9781624105517

ISBN: (纸本)9781624105517

The art and science of writing parallelized software, using methods such as Open Multi-Processing (OpenMP) and Open Accelerators (OpenACC), is dominated by computer scientists. Engineers and non-computer scientists looking to apply these techniques to their project applications face a steep learning curve, especially when looking to adapt their original single threaded software to run multi-threaded on graphics processing units (GPUs). There are significant changes in mindset that must occur;such as how to manage memory, the organization of instructions, and the use of if statements (also known as branching). The purpose of this work is twofold: 1) to demonstrate the applicability of parallelized coding methodologies, OpenMP and OpenACC, to tasks outside of the typical large scale matrix mathematics;and 2) to discuss, from an engineer’s perspective, the lessons learned from parallelizing software using these computer science techniques. This work applies OpenMP, on both multi-core central processing units (CPUs) and Intel® Xeon Phi™ 7210, and OpenACC on GPUs. These parallelization techniques are used to tackle the simulation of thousands of entry vehicle trajectories through the integration of six degree of freedom (DoF) equations of motion (EoM). The forces and moments acting on the entry vehicle, and used by the EoM, are estimated using multiple models of varying levels of complexity. Several benchmark comparisons are made on the execution of six DoF trajectory simulation: single thread Intel® Xeon® E5-2670 CPU, multi-thread CPU using OpenMP, multi-thread Xeon Phi™ 7210 using OpenMP, and multi-thread NVIDIA® Tesla® K40 GPU using OpenACC. These benchmarks are run on the Pleiades Supercomputer Cluster at the National Aeronautics and Space Administration (NASA) Ames Research center (ARC), and a Xeon Phi™ 7210 node at NASA Langley Research center (LaRC). © 2018, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Program processors

来源：评论

学校读者我要写书评

暂无评论

Optical data transmission at 44 Terabits/s with a 49GHz Kerr soliton crystal microcomb

TechRxiv

引用

TechRxiv 2020年

作者： Tan, Mengxi Corcoran, Bill Xu, Xingyuan Wu, Jiayang Boes, Andreas Nguyen, Thach G. Chu, Sai T. Little, Brent E. Morandotti, Roberto Mitchell, Arnan Moss, David J. Optical Sciences Centre Swinburne University of Technology HawthornVIC3122 Australia Dept. of Electrical and Computer Systems Engineering Monash University ClaytonVIC3800 Australia School of Engineering RMIT University MelbourneVIC3001 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 Precision Mechanics of CAS Xi’an China INRS-Énergie Matériaux et Télécommunications 1650 Boulevard Lionel-Boulet VarennesQCJ3X 1S2 Canada

We report world record high data transmission over standard optical fiber from a single optical source. We achieve a line rate of 44.2 Terabits per second (Tb/s) employing only the C-band at 1550nm, resulting in a spectral efficiency of 10.4 bits/s/Hz. We use a new and powerful class of micro-comb called soliton crystals that exhibit robust operation and stable generation as well as a high intrinsic efficiency that, together with an extremely low spacing of 48.9 GHz enables a very high coherent data modulation format of 64 QAM. We achieve error free transmission across 75 km of standard optical fiber in the lab and over a field trial with a metropolitan optical fiber network. This work demonstrates the ability of optical micro-combs to exceed other approaches in performance for the most demanding practical optical communications applications. © 2020, CC BY.

关键词： Optical fibers

来源：评论

学校读者我要写书评

暂无评论

LMI-Based Controller Design for Time-Delay Nonlinear Descriptor systems with Guaranteed Exponential Estimates

引用

IFAC-PapersOnLine 2018年第13期51卷 585-590页

作者： Arceo, Juan Carlos Villafuerte, Raúl Estrada-Manzo, Victor Bernal, Miguel University of Valenciennes and Hainaut Cambrésis LAMIH UMR CNRS Valenciennes Cedex 98201 France Research Center on Information Technology and Systems Hidalgo State University Carretera Pachuca-Tulancingo Km. 4.5 Mineral de la ReformaHidalgo42184 Mexico Dept. of Electrical and Electronics Engineering Sonora Institute of Technology 5 de Febrero 818 Sur Cd. Obregon85000 Mexico

This report is concerned with stability and stabilization of time-delay nonlinear nonsigular descriptor systems. Based-on a Lyapunov-Krasovskii functional and an exact convex representation of the system, conditions in the form of linear matrix inequalities are found that guarantee exponential estimates. The effectiveness of the proposed solutions is illustrated by means of numerical examples. © 2018

关键词： Linear matrix inequalities Delay control systems Describing functions Lyapunov functions Robustness (control systems) Stabilization Time delay Timing circuits Controller designs Convex modeling Descriptor systems Exponential estimates Exponential stabilization Lyapunov Krasovskii functionals Nonlinear descriptor system Stability and stabilizations

来源：评论

学校读者我要写书评

暂无评论

Photonic RF and microwave channelizer based on a Kerr soliton crystal micro-comb

TechRxiv

引用

TechRxiv 2020年

作者： Tan, Mengxi Xu, Xingyuan Wu, Jiayang Boes, Andreas Corcoran, Bill Nguyen, Thach G. Chu, Sai T. Little, Brent E. Morandotti, Roberto Mitchell, Arnan Moss, David J. Optical Sciences Centre Swinburne University of Technology HawthornVIC3122 Australia Dept. of Electrical and Computer Systems Engineering Monash University ClaytonVIC3800 Australia School of Engineering RMIT University MelbourneVIC3001 Australia Department of Physics and Material Science City University of Hong Kong Tat Chee Avenue Hong Kong Hong Kong Xi’an Institute of Optics and Precision Mechanics Precision Mechanics of CAS Xi’an China INRS-Énergie Matériaux et Télécommunications 1650 Boulevard Lionel-Boulet VarennesQCJ3X 1S2 Canada

We report a 92 channel RF channelizer based on a 48.9 GHz integrated micro-comb that operates via soliton crystals, together with a passive high-Q ring resonator that acts as a periodic filter with an optical 3dB bandwidth of 121.4 MHz. We obtain an instant RF bandwidth of 8.08 GHz and 17.55 GHz achieved through temperature tuning. These results represent a major advance to achieving fully integrated photonic RF spectrum channelizers with reduced low complexity, size, and high performance for digital-compatible signal detection and broadband analog signal processing. © 2020, CC BY.

关键词： Microwave photonics

来源：评论

学校读者我要写书评

暂无评论

LMI-Based Exponential Estimates for Time-Delay Nonlinear Descriptor systems

引用

IFAC-PapersOnLine 2018年第10期51卷 139-144页

作者： Arceo, Juan Carlos Villafuerte, Raúl Estrada-Manzo, Victor Bernal, Miguel University of Valenciennes and Hainaut Cambrésis LAMIH UMR CNRS 8201 ValenciennesCedex 9 France Research Center on Information Technology and Systems Hidalgo State University Carretera Pachuca-Tulancingo Km. 4.5 Mineral de la ReformaHidalgo42184 Mexico Dept. of Electrical and Electronics Engineering Sonora Institute of Technology 5 de Febrero 818 Sur Cd. Obregon85000 Mexico

This paper presents novel results on exponential estimates for time-delay nonlinear descriptor systems with nonsingular left-hand side. By means of a Lyapunov-Krasovskii functional and an exact convex representation of the system, conditions in the form of linear matrix inequalities are found that guarantee exponential bounds of solutions. Illustrative examples are provided that show the effectiveness of the proposed solutions. © 2016

关键词： Linear matrix inequalities Asymptotic stability Describing functions Lyapunov functions Time delay Timing circuits Convex models Exponential bounds Exponential estimates Lyapunov Krasovskii functionals Nonlinear descriptor system Nonsingular

来源：评论

学校读者我要写书评

暂无评论

An Immersive System with Multi-Modal Human-computer Interaction

An Immersive System with Multi-Modal Human-Computer Interact...

引用

International Conference on Automatic Face and Gesture Recognition

作者： Rui Zhao Kang Wang Rahul Divekar Robert Rouhani Hui Su Qiang Ji Dept. of Electrical Computer & Systems Engineering RPI USA Dept. of Computer Science RPI USA RPI Cognitive Immersive Systems Lab USA IBM T. J. Watson Research Center USA

We introduce an immersive system prototype that integrates face, gesture and speech recognition techniques to support multi-modal human-computer interaction capability. Embedded in an indoor room setting, a multi-camera system is developed to monitor the user facial behavior, body gesture and spatial location in the room. A server that fuses different sensor inputs in a time-sensitive manner so that our system knows who is doing what at where in real-time. When correlating with speech input, the system can better understand the user intention for interaction purpose. We evaluate the performance of core recognition techniques on both benchmark and self-collected datasets and demonstrate the benefit of the system in various use cases.

关键词： Cameras Visualization Image color analysis Calibration Face Gesture recognition Three-dimensional displays

来源：评论

学校读者我要写书评

暂无评论

Considerations and recommendations from the ISMRM Diffusion Study Group for preclinical diffusion MRI: Part 3 — Ex vivo imaging: data processing, comparisons with microscopy, and tractography

arXiv

引用

arXiv 2024年

作者： Schilling, Kurt G. Howard, Amy F.D. Grussu, Francesco Ianus, Andrada Hansen, Brian Barrett, Rachel L.C. Aggarwal, Manisha Michielse, Stijn Nasrallah, Fatima Syeda, Warda Wang, Nian Veraart, Jelle Roebroeck, Alard Bagdasarian, Andrew F. Eichner, Cornelius Sepehrband, Farshid Zimmermann, Jan Soustelle, Lucas Bowman, Christien Tendler, Benjamin C. Hertanu, Andreea Jeurissen, Ben Verhoye, Marleen Frydman, Lucio van de Looij, Yohan Hike, David Dunn, Jeff F. Miller, Karla Landman, Bennett A. Shemesh, Noam Anderson, Adam McKinnon, Emilie Farquharson, Shawna Dell' Acqua, Flavio Pierpaoli, Carlo Drobnjak, Ivana Leemans, Alexander Harkins, Kevin D. Descoteaux, Maxime Xu, Duan Huang, Hao Santin, Mathieu D. Grant, Samuel C. Obenaus, Andre Kim, Gene S. Wu, Dan Le Bihan, Denis Blackband, Stephen J. Ciobanu, Luisa Fieremans, Els Bai, Ruiliang Leergaard, Trygve B. Zhang, Jiangyang Dyrby, Tim B. Johnson, G. Allan Cohen-Adad, Julien Budde, Matthew D. Jelescu, Ileana O. Radiology and Radiological Sciences Vanderbilt University Medical Center NashvilleTN United States Vanderbilt University Institute of Imaging Science Vanderbilt University NashvilleTN United States Department of Bioengineering Imperial College London London United Kingdom FMRIB Centre Wellcome Centre for Integrative Neuroimaging Nuffield Department of Clinical Neurosciences University of Oxford Oxford United Kingdom Radiomics Group Vall d’Hebron Institute of Oncology Vall d’Hebron Barcelona Hospital Campus Barcelona Spain Queen Square MS Centre Queen Square Institute of Neurology Faculty of Brain Sciences University College London London United Kingdom Champalimaud Research Champalimaud Foundation Lisbon Portugal Center of Functionally Integrative Neuroscience Aarhus University Aarhus Denmark Department of Neuroimaging Institute of Psychiatry Psychology and Neuroscience King's College London London United Kingdom NatBrainLab Department of Forensics and Neurodevelopmental Sciences Institute of Psychiatry Psychology and Neuroscience King's College London London United Kingdom Russell H. Morgan Department of Radiology and Radiological Science Johns Hopkins University School of Medicine BaltimoreMD United States Maastricht University Medical Center Maastricht Netherlands The Queensland Brain Institute The University of Queensland Queensland Australia Melbourne Neuropsychiatry Centre The University of Melbourne ParkvilleVIC Australia Department of Radiology and Imaging Sciences Indiana University IN United States Stark Neurosciences Research Institute Indiana University School of Medicine IN United States Center for Biomedical Imaging NYU Grossman School of Medicine New YorkNY United States Faculty of psychology and Neuroscience Maastricht University Maastricht Netherlands Department of Chemical & Biomedical Engineering FAMU-FSU College of Engineering Florida State University TallahasseeFL United States Center for Interdisciplinary Magnetic Res

Preclinical diffusion MRI (dMRI) has proven value in methods development and validation, characterizing the biological basis of diffusion phenomena, and comparative anatomy. While dMRI enables in vivo non-invasive characterization of tissue, ex vivo dMRI is increasingly being used to probe tissue microstructure and brain connectivity. Ex vivo dMRI has several experimental advantages that facilitate high spatial resolution and high signal-to-noise ratio (SNR) images, cutting-edge diffusion contrasts, and direct comparison with histological data as a methodological validation. However, there are a number of considerations that must be made when performing ex vivo experiments. The steps from tissue preparation, image acquisition and processing, and interpretation of results are complex, with many decisions that not only differ dramatically from in vivo imaging of small animals, but ultimately affect what questions can be answered using the data. This work concludes a 3-part series of recommendations and considerations for preclinical dMRI. Herein, we describe best practices for dMRI of ex vivo tissue, with a focus on image pre-processing, data processing and model fitting, and tractography. In each section, we attempt to provide guidelines and recommendations, but also highlight areas for which no guidelines exist (and why), and where future work should lie. We end by providing guidelines on code sharing and data sharing, and point towards open-source software and databases specific to small animal and ex vivo imaging. © 2024, CC BY.

关键词： Data Sharing

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：