检索结果-内蒙古大学图书馆

Defect engineering approaches for metal oxide semiconductor-based chemiresistive gas sensing

Coordination Chemistry Reviews 2025年 541卷

作者： Kumar, Amit Mazumder, Julaiba Tahsina Joyen, Kenza Favier, Frédéric Mirzaei, Ali Kim, Jin-Young Kwoka, Monika Bechelany, Mikhael Jha, Ravindra Kumar Kumar, Mahesh Kim, Hyoun Woo Kim, Sang Sub Department of Electrical Engineering Indian Institute of Technology Jodhpur Jodhpur 342030 India Department of Electronics Assam Skill University Assam Mangaldai 784125 India European Institut of Membranes (IEM) – UMR 5635 University of Montpellier ENSCM CNRS Montpellier 34090 France Institut Charles Gerhardt Montpellier (ICGM) – UMR 5253 University of Montpellier ENSCM CNRS Montpellier 34090 France Department of Materials Science and Engineering Shiraz University of Technology Shiraz 715557-13876 Iran Customized manufacturing R&D department Korea Institute of Industrial Technology Gyeonggi-do 15014 South Korea Department of Cybernetics Nanotechnology and Data Processing Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Akademicka 16 Gliwice 44-100 Poland Functional Materials Group Gulf University for Science and Technology (GUST) Mubarak Al-Abdullah 32093 Kuwait Department of Electronics and Electrical Engineering & Centre for Intelligent Cyber-Physical Systems Indian Institute of Technology Guwahati Guwahati 781039 India Division of Materials Science and Engineering Hanyang University Seoul 04763 South Korea Department of Materials Science and Engineering Inha University Incheon 22212 South Korea

Defect engineering in metal oxides presents a promising approach for tailoring material properties. This strategy enhances gas sorption, catalysis, and control over key physical characteristics such as bandgap, magnetic behavior, and electrical conductivity. Despite its potential, the role of defect engineering in advancing metal oxide semiconductor (MOS) gas-sensing performance remains underexplored. This review introduces defect engineering strategies, emphasizing their applications in gas sensing. Gas sensors play a vital role in environmental monitoring, industrial safety, healthcare, and in improving energy efficiency. The demand for advanced gas sensors has never been more critical, given the need for real-time, accurate, and cost-effective detection of pollutant gases. MOS-based gas sensors are widely used in air quality monitoring, industrial safety, and health diagnostics. Vacancies and defect architectures in MOS have been widely studied for their role in sensing performance, as they fundamentally influence sensor efficiency. The effectiveness of MOS sensors largely depends on the type and concentration of defects. This review introduces vacancies and defects in MOS, followed by an in-depth discussion of defect types, factors influencing defect formation, and their role in charge transport. Additionally, it examines the correlation between elemental chemical properties and defect chemistry. Special attention is given to the defect chemistry of metal oxides, including TiO₂, ZnO, Co₃O₄, ZrO₂, WO₃, and CeO₂. It concludes with an examination of surface engineering methods for defect control to improve gas-sensing capabilities. © 2024

关键词： Chemiresistive gas sensing Defect engineering Metal-oxide semiconductor

来源：评论

学校读者我要写书评

暂无评论

Medium-Grain Niobium SRF Cavity Production Technology for Science Frontiers and Accelerator Applications

arXiv

引用

arXiv 2022年

作者： Myneni, Ganapati Elsayed-Ali, Hani E. Islam, Md Obidul Sayeed, Md Nizam Ciovati, G. Dhakal, P. Rimmer, R.A. Carl, M. Fajardo, A. Lannoy, N. Khanal, B. Dohmae, T. Kumar, A. Saeki, T. Umemori, K. Yamanaka, M. Michizono, S. Yamamoto, A. BSCE Systems Inc. YorktownVA23693 United States Electrical And Computer Engineering Department Old Dominion University NorfolkVA23529 United States Thomas Jefferson National Accelerator Facility Newport NewsVA23606 United States ATI Specialty Alloys & Components AlbanyOR97321 United States Department Of Physics Old Dominion University NorfolkVA23529 United States Ibaraki Tsukuba305-0801 Japan Geneva CH-1211 Switzerland

We propose cost-effective production of medium grain (MG) niobium (Nb) discs directly sliced from forged and annealed billet. This production method provides clean surface conditions and reliable mechanical characteristics with sub-millimeter average grain size resulting in stable SRF cavity production. We propose to apply this material to particle accelerator applications in the science and industrial frontiers. The science applications require high field gradients (>∼40 MV/m) particularly in pulse mode. The industrial applications require high Q0values with moderate gradients (∼30 MV/m) in CW mode operation. This report describes the MG Nb disc production recently demonstrated and discusses future prospects for application in advanced particle accelerators in the science and industrial frontiers. Copyright © 2022, The Authors. All rights reserved.

关键词： Niobium

来源：评论

学校读者我要写书评

暂无评论

Walking Control Based on Step Timing Adaptation

Walking Control Based on Step Timing Adaptation

引用

作者： Khadiv, Majid Herzog, Alexander Moosavian, S. Ali. A. Righetti, Ludovic Righetti, Ludovic Movement Generation and Control Group Max-Planck Institute for Intelligent Systems Tuebingen72076 Germany Google X Mountain ViewCA94043 United States Department of Mechanical Engineering K. N. Toosi University of Technology Tehran*** Iran Department of Electrical and Computer Engineering New York University BrooklynNY11201 United States

Step adjustment can improve the gait robustness of biped robots;however, the adaptation of step timing is often neglected as it gives rise to nonconvex problems when optimized over several footsteps. In this article, we argue that it is not necessary to optimize walking over several steps to ensure gait viability and show that it is sufficient to merely select the next step timing and location. Using this insight, we propose a novel walking pattern generator that optimally selects step location and timing at every control cycle. Our approach is computationally simple compared to standard approaches in the literature, yet guarantees that any viable state will remain viable in the future. We propose a swing foot adaptation strategy and integrate the pattern generator with an inverse dynamics controller that does not explicitly control the center of mass nor the foot center of pressure. This is particularly useful for biped robots with limited control authority over their foot center of pressure, such as robots with point feet or passive ankles. Extensive simulations on a humanoid robot with passive ankles demonstrate the capabilities of the approach in various walking situations, including external pushes and foot slippage, and emphasize the importance of step timing adaptation to stabilize walking. © 2004-2012 IEEE.

关键词： Anthropomorphic robots

来源：评论

学校读者我要写书评

暂无评论

Semantic Communications for Future Internet: Fundamentals, Applications, and Challenges

arXiv

引用

arXiv 2022年

作者： Yang, Wanting Du, Hongyang Liew, Zi Qin Lim, Wei Yang Bryan Xiong, Zehui Niyato, Dusit Chi, Xuefen Shen, Xuemin Sherman Miao, Chunyan The Department of Communications Engineering Jilin University Changchun130012 China Information Systems Technology and Design Pillar Singapore University of Technology and Design Singapore Singapore The School of Computer Science and Engineering The Energy Research Institute Ntu Interdisciplinary Nanyang Technological University Singapore Singapore Alibaba Group The Alibaba-NTU Joint Research Institute Nanyang Technological University Singapore Singapore School of Computer Science and Engineering Ntu Singapore Singapore The Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada The School of Computer Science and Engineering Nanyang Technological University Singapore Singapore The Alibaba-NTU Joint Research Institute Nanyang Technological University Singapore Singapore The Joint NTU-UBC Research Centre of Excellence in Active Living for the Elderly Nanyang Technological University Singapore Singapore

With the increasing demand for intelligent services, the sixth-generation (6G) wireless networks will shift from a traditional architecture that focuses solely on a high transmission rate to a new architecture that is based on the intelligent connection of everything. Semantic communication (SemCom), a revolutionary architecture that integrates user as well as application requirements and the meaning of information into data processing and transmission, is predicted to become a new core paradigm in 6G. While SemCom is expected to progress beyond the classical Shannon paradigm, several obstacles need to be overcome on the way to a SemCom-enabled smart wireless Internet. In this paper, we first highlight the motivations and compelling reasons of SemCom in 6G. Then, we provide an overview of SemCom-related theory development. After that, we introduce three types of SemCom, i.e., semantic-oriented communication, goal-oriented communication, and semantic-aware communication. Following that, we organize the design of the communication system into three dimensions, i.e., semantic information (SI) extraction, SI transmission, and SI metrics. For each dimension, we review existing techniques and discuss their benefits and limitation, as well as the remaining challenges. Then, we introduce the potential applications of SemCom in 6G and portray the vision of future SemCom-empowered network architecture. Finally, we outline future research opportunities. In a nutshell, this paper provides a holistic review of the fundamentals of SemCom, its applications in 6G networks, and the existing challenges and open issues with insights for further in-depth investigations. Copyright © 2022, The Authors. All rights reserved.

关键词： Network architecture

来源：评论

学校读者我要写书评

暂无评论

Deterministic Identification For MC ISI-Poisson Channel

arXiv

引用

arXiv 2022年

作者： Salariseddigh, Mohammad Javad Jamali, Vahid Pereg, Uzi Boche, Holger Deppe, Christian Schober, Robert Institute For Communication Engineering Technical University of Munich Munich80333 Germany Group of Resilient Communication Systems Technical University of Darmstadt Germany Department of Electrical and Computer Eng. Technion – Israel Institute of Technology Haifa80333 Israel Theoretical Information Technology Technical University of Munich Munich80333 Germany Institute for Digital Communications Friedrich-Alexander-University Erlangen-Nürnberg Erlangen Germany

Several applications of molecular communications (MC) feature an alarm-prompt behavior for which the prevalent Shannon capacity may not be the appropriate performance metric. The identification capacity as an alternative measure for such systems has been motivated and established in the literature. In this paper, we study deterministic identification (DI) for the discrete-time Poisson channel (DTPC) with inter-symbol interference (ISI) where the transmitter is restricted to an average and a peak molecule release rate constraint. Such a channel serves as a model for diffusive MC systems featuring long channel impulse responses and employing molecule counting receivers. We derive lower and upper bounds on the DI capacity of the DTPC with ISI when the number of ISI channel taps K may grow with the codeword length n (e.g., due to increasing symbol rate). As a key finding, we establish that for deterministic encoding, the codebook size scales as 2(n log n)R assuming that the number of ISI channel taps scales as K = 2κlogn, where R is the coding rate and κ is the ISI rate. Moreover, we show that optimizing κ leads to an effective identification rate [bits/s] that scales linearly with n, which is in contrast to the typical transmission rate [bits/s] that is independent of n. Copyright © 2022, The Authors. All rights reserved.

关键词： Channel capacity

来源：评论

学校读者我要写书评

暂无评论

A review: Challenges and opportunities for artificial intelligence and robotics in the offshore wind sector

arXiv

引用

arXiv 2021年

作者： Mitchell, Daniel Blanche, Jamie Harper, Sam Lim, Theodore Gupta, Ranjeetkumar Zaki, Osama Tang, Wenshuo Robu, Valentin Watson, Simon Flynn, David Smart Systems Group Institute of Sensors Signals and Systems School of Engineering and Physical Sciences Heriot-Watt University EdinburghEH14 4AS United Kingdom Centre for Mathematics and Computer Science Intelligent and Autonomous Systems Group CWI Amsterdam1098 XG Netherlands Delft2628 XE Netherlands University of Manchester Department of Electrical and Electronic Engineering Oxford Road ManchesterM13 9PL United Kingdom

A global trend in increasing wind turbine size and distances from shore is emerging within the rapidly growing offshore wind farm market. In the UK, the offshore wind sector produced its highest amount of electricity in the UK in 2019, a 19.6% increase on the year before. Currently, the UK is set to increase production further, targeting a 74.7% increase of installed turbine capacity as reflected in recent Crown Estate leasing rounds. With such tremendous growth, the sector is now looking to Robotics and Artificial Intelligence (RAI) in order to tackle lifecycle service barriers as to support sustainable and profitable offshore wind energy production. Today, RAI applications are predominately being used to support short term objectives in operation and maintenance. However, moving forward, RAI has the potential to play a critical role throughout the full lifecycle of offshore wind infrastructure, from surveying, planning, design, logistics, operational support, training and decommissioning. This paper presents one of the first systematic reviews of RAI for the offshore renewable energy sector. The state-of-the-art in RAI is analyzed with respect to offshore energy requirements, from both industry and academia, in terms of current and future requirements. Our review also includes a detailed evaluation of investment, regulation and skills development required to support the adoption of RAI. The key trends identified through a detailed analysis of patent and academic publication databases provide insights to barriers such as certification of autonomous platforms for safety compliance and reliability, the need for digital architectures for scalability in autonomous fleets, adaptive mission planning for resilient resident operations and optimization of human machine interaction for trusted partnerships between people and autonomous assistants. Our study concludes with identification of technological priorities and outlines their integration into a new ‘symbiotic digital

关键词： Offshore wind farms

来源：评论

学校读者我要写书评

暂无评论

Graph Attention Networks for Channel Estimation in RIS-assisted Satellite IoT Communications

arXiv

引用

arXiv 2021年

作者： Tekbıyık, Kürşat Kurt, Güneş Karabulut Ekti, Ali Rıza Yanikomeroglu, Halim Department of Electronics and Communications Engineering Istanbul Technical University Istanbul Turkey Poly-Grames Research Center Department of Electrical Engineering Polytechnique Montréal Montréal Canada Grid Communications and Security Group Electrification and Energy Infrastructure Division Oak Ridge National Laboratory Oak RidgeTN United States Department of Systems and Computer Engineering Carleton University Ottawa Canada

Direct-to-satellite (DtS) communication has gained importance recently to support globally connected Internet of things (IoT) networks. However, relatively long distances of densely deployed satellite networks around the Earth cause a high path loss. In addition, since high complexity operations such as beamforming, tracking and equalization have to be performed in IoT devices partially, both the hardware complexity and the need for high-capacity batteries of IoT devices increase. The reconfigurable intelligent surfaces (RISs) have the potential to increase the energy-efficiency and to perform complex signal processing over the transmission environment instead of IoT devices. But, RISs need the information of the cascaded channel in order to change the phase of the incident signal. This study evaluates the pilot signal as a graph and incorporates this information into the graph attention networks (GATs) to track the phase relation through pilot signaling. The proposed GAT-based channel estimation method examines the performance of the DtS IoT networks for different RIS configurations to solve the challenging channel estimation problem. It is shown that the proposed GAT both demonstrates a higher performance with increased robustness under changing conditions and has lower computational complexity compared to conventional deep learning methods. Moreover, bit error rate performance is investigated for RIS designs with discrete and non-uniform phase shifts under channel estimation based on the proposed method. One of the findings in this study is that the channel models of the operating environment and the performance of the channel estimation method must be considered during RIS design to exploit performance improvement as far as possible. © 2021, CC BY-NC-SA.

关键词： Complex networks

来源：评论

学校读者我要写书评

暂无评论

Model-based machine learning for joint digital backpropagation and PMD compensation

arXiv

引用

arXiv 2020年

作者： Bütler, Rick M. Häger, Christian Pfister, Henry D. Liga, Gabriele Alvarado, Alex Information and Communication Theory Lab Signal Processing Systems Group Department of Electrical Engineering Eindhoven University of Technology Eindhoven Netherlands Department of Electrical Engineering Chalmers University of Technology Gothenburg Sweden Department of Electrical and Computer Engineering Duke University Durham United States

In this paper, we propose a model-based machine-learning approach for dual-polarization systems by parameterizing the split-step Fourier method for the Manakov-PMD equation. The resulting method combines hardware-friendly time-domain nonlinearity mitigation via the recently proposed learned digital backpropagation (LDBP) with distributed compensation of polarization-mode dispersion (PMD). We refer to the resulting approach as LDBP-PMD. We train LDBP-PMD on multiple PMD realizations and show that it converges within 1% of its peak dB performance after 428 training iterations on average, yielding a peak effective signal-to-noise ratio of only 0.30 dB below the PMD-free case. Similar to state-of-the-art lumped PMD compensation algorithms in practical systems, our approach does not assume any knowledge about the particular PMD realization along the link, nor any knowledge about the total accumulated PMD. This is a significant improvement compared to prior work on distributed PMD compensation, where knowledge about the accumulated PMD is typically assumed. We also compare different parameterization choices in terms of performance, complexity, and convergence behavior. Lastly, we demonstrate that the learned models can be successfully retrained after an abrupt change of the PMD realization along the fiber. Copyright © 2020, The Authors. All rights reserved.

关键词： Polarization mode dispersion

来源：评论

学校读者我要写书评

暂无评论

Simple Switched-Inductor High-Gain Boost converter

Simple Switched-Inductor High-Gain Boost converter

引用

International Symposium on Power Electronics, electrical Drives, Automation and Motion, SPEEDAM

作者： Alireza Siadatan Sahar Tahzibi Reza Babaloo Jacob Gotlieb Energy Systems Group The Edward S. Rogers Sr. Department of Electrical and Computer Engineering Faculty of Applied Science and Engineering University of Toronto Toronto ON Canada Electrical Engineering Group Department of Electronics Information and Bioengineering (DEIB) Industrial and information Engineering school Polytechnic University of Milan Milan Italy Department of Electrical & Computer Engineering University of British Columbia Vancouver BC Canada

ISBN: (数字)9781728170190

ISBN: (纸本)9781728170206

Due to the environmental concerns, renewable energy sources such as photovoltaic (PV) are turned into a promising way to supply humans' energy demand. Despite considerable improvements in this field, there are still some barriers hindering swift growth of technology. Low output voltage is one of the main challenges. Since grid as well as most of the energy consumers requires higher voltage than output voltage of a PV panel, it is inevitable to utilize high step-up dc/dc converters as an interface. In this paper, one simple boost converter topology based on the switched-inductor concept is introduced. The proposed topology has high voltage gain, a great output voltage flexibility, and the ability to reduce the input voltage ripple. Due to its modular structure, different output voltages can be provided just by increasing the number of boosting cells. The proposed topology is analyzed and simulation results are provided to verify the converter performance.

关键词： Switches Capacitors Topology Photovoltaic systems DC-DC power converters

来源：评论

学校读者我要写书评

暂无评论

Impact of UAV Jittering on the Air-to-Ground Wireless Channel

arXiv

引用

arXiv 2020年

作者： Banagar, Morteza Dhillon, Harpreet S. Molisch, Andreas F. Wireless@VT Bradley Department of Electrical and Computer Engineering Virginia Tech BlacksburgVA United States Wireless Devices and Systems Group Ming Hsieh Department of Electrical and Computer Engineering University of Southern California Los AngelesCA United States

This letter studies the impact of unmanned aerial vehicle (UAV) jittering on the coherence time of the wireless channel between UAVs and a ground user equipment (UE), using a Rician multi-path channel model. We consider two different scenarios for the number of UAVs: (i) single UAV scenario (SUS), and (ii) multiple UAV scenario (MUS). For each scenario, we model the UAV jittering by two random processes, i.e., the Wiener and sinusoidal processes, and characterize the channel autocorrelation function (ACF) which is then used to derive the coherence time of the channel. For the MUS, we further show that the UAV-UE channels for different UAVs are uncorrelated from each other. A key observation in this letter is that even for a small UAV jittering, the coherence time of the channel may degrade quickly, which may make it difficult to track the channel and establish a reliable communication link. Copyright © 2020, The Authors. All rights reserved.

关键词： Unmanned aerial vehicles (UAV)

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：