检索结果-内蒙古大学图书馆

Impact of nanopillars on phonon dispersion and thermal conductivity of silicon membranes

Nanoscale 2023年第5期15卷 2248-2253页

作者： Anufriev, Roman Ohori, Daisuke Wu, Yunhui Yanagisawa, Ryoto Jalabert, Laurent Samukawa, Seiji Nomura, Masahiro Institute of Industrial Science The University of Tokyo Tokyo153-8505 Japan Institute of Fluid Science Tohoku University Sendai980-8577 Japan The University of Tokyo Tokyo153-8505 Japan Advanced Institute for Materials Research Tohoku University Sendai980-8577 Japan Department of Electrical and Computer Engineering National Yang Ming Chiao Tung University Hsinchu300 Taiwan Joint Research Center of National Yang Ming Chiao Tung University Tohoku University National Yang Ming Chiao Tung University Hsinchu300 Taiwan

The performance of silicon-based thermoelectric energy generators is limited by the high thermal conductivity of silicon. Theoretical works have long proposed reducing the thermal conductivity by resonant phonon modes in nanopillars placed on the surface of silicon films. However, these predictions have never been confirmed due to the difficulty in the nanofabrication and measurements of such nanoscale systems. In this work, we report on the fabrication and measurements of silicon films with nanopillars as small as 12 nm in diameter. Our Brillouin light scattering spectroscopy experiments revealed that nanopillars indeed host resonant phonon modes. Yet, our thermal measurements using the micro time-domain thermoreflectance technique showed only a statistically insignificant difference between the thermal properties of silicon membranes with and without nanopillars. Results of this work contrast with the predictions of a substantial reduction in the thermal conductivity due to nanopillars and suggest refining the simulations to account for realistic experimental conditions. © 2023 The Royal Society of Chemistry.

关键词： Phonons

来源：评论

学校读者我要写书评

暂无评论

Imaging atomic-scale chemistry from fused multi-modal electron microscopy

引用

npj Computational Materials 2022年第1期8卷 164-171页

作者： Jonathan Schwartz Zichao Wendy Di Yi Jiang Alyssa J.Fielitz Don-Hyung Ha Sanjaya D.Perera Ismail El Baggari Richard D.Robinson Jeffrey A.Fessler Colin Ophus Steve Rozeveld Robert Hovden Department of Materials Science and Engineering University of MichiganAnn ArborMIUSA Mathematics and Computer Science Division Argonne National LaboratoryLemontILUSA Advanced Photon Source Facility Argonne National LaboratoryLemontILUSA Dow Chemical Co. MidlandMIUSA Department of Material Science and Engineering Cornell UniversityIthacaNew YorkUSA School of Integrative Engineering Chung-Ang UniversitySeoulRepublic of Korea Department of Physics Cornell UniversityIthacaNYUSA The Rowland Institute at Harvard CambridgeMAUSA Department of Electrical Engineering and Computer Science University of MichiganAnn ArborMIUSA National Center for Electron Microscopy Lawrence Berkeley National LaboratoryMolecular FoundryBerkeleyCAUSA Applied Physics Program University of MIchiganAnn ArborMIUnited States

Efforts to map atomic-scale chemistry at low doses with minimal noise using electron microscopes are fundamentally limited by inelastic ***,fused multi-modal electron microscopy offers high signal-to-noise ratio(SNR)recovery of material chemistry at nano-and atomic-resolution by coupling correlated information encoded within both elastic scattering(high-angle annular dark-field(HAADF))and inelastic spectroscopic signals(electron energy loss(EELS)or energy-dispersive x-ray(EDX)).By linking these simultaneously acquired signals,or modalities,the chemical distribution within nanomaterials can be imaged at significantly lower doses with existing detector *** many cases,the dose requirements can be reduced by over one order of *** high SNR recovery of chemistry is tested against simulated and experimental atomic resolution data of heterogeneous nanomaterials.

关键词： materials chemistry fused

来源：评论

学校读者我要写书评

暂无评论

Development of Localized Cutaneous Force Feedback System for Robotics Assisted Surgery Systems 28th

Development of Localized Cutaneous Force Feedback System for...

引用

28th International Conference on Knowledge Based and Intelligent information and engineering Systems, KES 2024

作者： See, Aaron Raymond Tiong, Thad Jacob De Guzman, Lanz Benedict Contee, Kenneth Lim, Garfield Greg Yebes, Carl Sebastian Department of Electrical Engineering Southern Taiwan University of Science and Technology No. 1 Nantai St Yongkang District Tainan City71005 Taiwan Department of Electronic Engineering National Chin-Yi University of Technology No. 57 Section 2 Zhongshan Rd Taiping District Taichung City411030 Taiwan Department of Electrical Engineering Universitas Katolik Indonesia Atma Jaya Jl. Jend. Sudirman No.51 5 RT.004/RW.4 Karet Semanggi Kecamatan Setiabudi Kota Jakarta Selatan Daerah Khusus Jakarta12930 Indonesia School of Computer Studies University of San Jose - Recoletos Basak Pardo Cebu City6000 Philippines College of Computer Studies Cebu Institute of Technology - University Natalio B. Bacalso Ave Cebu City Cebu6000 Philippines

This study explores integrating a novel cutaneous force feedback system for robotic-assisted surgery (RAS) systems aimed at improving tactile perception for surgical precision and safety. The system developed comprises two major components: a force-sensitive matrix sensor and a 4x4 tactile pin interface. Forces experienced by the sensors are mirrored through the tactile interface, conveying the sensation of knowing which part of the sensor is in contact and how much force is subjected to it. An algorithm called Dynamic Interval Localization (DIL) was developed to manipulate pin actuation by scheduling individualized dynamic oscillation. The system successfully detected operating forces from 0.1N to 5N while concurrently providing respective cutaneous feedback. The system's performance in force localization suggests significant potential and promises in elevating the haptic features of RAS systems. © 2024 The Authors.

关键词： Robotic surgery

来源：评论

学校读者我要写书评

暂无评论

Printable Aligned Single-Walled Carbon Nanotube Film with Outstanding Thermal Conductivity and Electromagnetic Interference Shielding Performance

引用

Nano-Micro Letters 2022年第11期14卷 143-156页

作者： Zhihui Zeng Gang Wang Brendan F.Wolan Na Wu Changxian Wang Shanyu Zhao Shengying Yue Bin Li Weidong He Jiurong Liu Joseph W.Lyding Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationSchool of Materials Science and EngineeringShandong UniversityShandongJinan 250061People’s Republic of China Department of Electrical and Computer Engineering Beckman Institute for Advanced Science and TechnologyUniversity of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of Chemistry Swiss Federal Institute of Technology in Zurich(ETH Zürich)8092 ZurichSwitzerland School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Empa Swiss Federal Laboratories for Materials Science and TechnologyÜberland Strasse 1298600 DübendorfSwitzerland Institute for Advanced Technology Shandong UniversityJinan 250061People’s Republic of China

Ultrathin,lightweight,and flexible aligned single-walled carbon nanotube(SWCNT)films are fabricated by a facile,environmentally friendly,and scalable printing *** aligned pattern and outstanding intrinsic properties render“metal-like”thermal conductivity of the SWCNT films,as well as excellent mechanical strength,flexibility,and ***,the aligned cellular microstructure promotes the electromagnetic interference(EMI)shielding ability of the SWCNTs,leading to excellent shielding effectiveness(SE)of~39 to 90 dB despite a density of only~0.6 g cm^(−3) at thicknesses of merely 1.5-24μm,*** ultrahigh thickness-specific SE of 25693 dB mm^(−1) and an unprecedented normalized specific SE of 428222 dB cm^(2)g^(−1) are accomplished by the freestanding SWCNT films,significantly surpassing previously reported shielding *** addition to an EMI SE greater than 54 dB in an ultra-broadband frequency range of around 400 GHz,the films demonstrate excellent EMI shielding stability and reliability when subjected to mechanical deformation,chemical(acid/alkali/organic solvent)corrosion,and high-/low-temperature *** novel printed SWCNT films offer significant potential for practical applications in the aerospace,defense,precision components,and smart wearable electronics industries.

关键词： Aligned film Single-walled carbon nanotube Lightweight Flexible Thermal conductivity Electromagnetic interference shielding

来源：评论

学校读者我要写书评

暂无评论

静态无源超构声呐实现声束动态扫描

引用

Science Bulletin 2023年第17期68卷 1862-1866页

作者：刘京京王未赵澄宇周永强张晗梁彬仇成伟程建春 Key Laboratory of Modern Acoustics(Ministry of Education) Institute of AcousticsDepartment of PhysicsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore Key Laboratory of Noise and Vibration Institute of AcousticsChinese Academy of SciencesBeijing 100190China

声束的连续动态扫描在超声成像、水下目标定位和声呐通信等诸多领域发挥关键作用.传统方法通常依赖于发射装置的机械扫描或有源相控阵的波束整形来实时调控声束的空间指向性,存在成本高、尺寸大、主动控制系统复杂而精准操控困难等问题... 详细信息

声束的连续动态扫描在超声成像、水下目标定位和声呐通信等诸多领域发挥关键作用.传统方法通常依赖于发射装置的机械扫描或有源相控阵的波束整形来实时调控声束的空间指向性,存在成本高、尺寸大、主动控制系统复杂而精准操控困难等问题.本文提出并构建了一种基于无源声学超表面的紧凑型静态声呐器件,无需主动控制和机械移动,仅在单一声源的作用下即可实现声束的动态扫描操控.这种新型声呐器件由具有深度亚波长厚度的二值化振幅编码单元组合而成,能够将单一声源发射的梳状频率谱转化为具有相同频率和空间间隔的声焦点阵列,从而引入频率梯度这一新的声波操控自由度,并通过时空声干涉效应产生可连续旋转的动态扫描声束.实验结果验证了所设计超构声呐的高速、宽角度声束扫描性能.此外,通过与传统的相位梯度调控技术结合,该机制还可以对扫描声束的空间形态进行任意的调节.这种基于静态无源超构声呐的声束动态扫描机制为声波的时空调控开辟了新的研究范式,并有望在水下对抗、超声诊疗等重要领域产生实际应用价值.

关键词：有源相控阵相位梯度声束动态扫描声呐干涉效应机械扫描连续旋转

来源：评论

学校读者我要写书评

暂无评论

LiFi-CFI: Light-weight Fine-grained Hardware CFI Protection for RISC-V

LiFi-CFI: Light-weight Fine-grained Hardware CFI Protection ...

引用

IEEE International Conference on Design & Test of Integrated Micro & Nano-Systems (DTS)

作者： Mahboobe Sadeghipour Roodsari Fatemeh Sheikhshoaei Nicolo Maunero Paolo Prinetto Zain Navabi Department of Automation and Information Politecnico di Torino Turin Italy School of Electrical and Computer Engineering University of Tehran Tehran Iran IMT School for Advanced Studies Lucca Italy

In today’s open-source industry, RISC-V based embedded devices are used in various applications where security is critical. RISC-V processors are vulnerable to many runtime attacks, including powerful code reuse and code injection in jump/return-oriented programming (JOP/ROP), known as control flow attacks (CFA). For this, several security techniques have been proposed to protect embedded devices from CFA, and one of the most secure categories is Control Flow Integrity (CFI). Alternative techniques consider the tradeoff between runtime hardware overhead and security protection. In particular, hardware-based techniques have attracted more attention in recent years because they consume less power and have less runtime overhead, which is critical in embedded systems. Considering these constraints, we have proposed a novel fine-grained technique for jump-oriented programming, where the required memory is replaced with a short Programmable Array Logic (PAL) to reduce runtime and hardware overhead. Also, a low-overhead shadow stack is proposed for return-oriented programming to reduce the required memory capacity compared to the traditional shadow stack implementation by handling the recursive function calls. The proposed Architecture called LiFi-CFI, is a lightweight hardware monitoring solution that can be attached to any IoT-class soft processor. LiFi-CFI not only reduces power consumption and hardware overhead compared to other advanced solutions but also maintains the security guarantees of the main CFI solution. It is a compact solution as a countermeasure with less than 1% hardware resource utilization for Xilinx Artix7 and 0.5% runtime overhead.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Automated Initialization of Large-Scale Real-Time EMT Simulation studies using Measured Data

Automated Initialization of Large-Scale Real-Time EMT Simula...

引用

IEEE General Meeting Power& Energy Society

作者： Eric Segerstrom Andrea Pinceti Katelynn Vance Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY Electric Transmission Operations Special Studies Dominion Energy Richmond VA

The increasing presence of high-bandwidth inverter-based resources, FACTS devices, and other components with fast dynamic characteristics requires more robust simulation methods to accurately capture the interactions of these components with more traditional power system components and their effects on the behavior of the bulk system. Many phenomena cannot be modeled with positive sequence programs alone, such as transformer saturation and power electronic device switching. Real-time electromagnetic transient (EMT) simulation architectures provide the potential to capture these dynamics in interactive, large-scale simulation models; however, developing, validating, and initializing new models for each individual study can be prohibitively time-consuming. This paper outlines the development of a reusable, modular large-scale, real-time EMT simulation model of Dominion Energy Virginia’s transmission system that can facilitate quick, iterable execution of transmission planning and training studies using architecture from RTDS Technologies. This work also outlines the development of an automated pipeline to initialize this model using data measured from the energy management system (EMS). The efficacy of these tools is demonstrated in a case study of the synchronization of two stable, isolated islands during system restoration.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A Novel Model for Driver Lane Change Prediction in Cooperatice Adaptive Cruise Control Systems

A Novel Model for Driver Lane Change Prediction in Cooperati...

引用

International Symposium on Signals, Circuits and Systems (ISSCS)

作者： Armin Nejadhossein Qasemabadi Saeed Mozaffari Mahdi Rezaei Majid Ahmadi Shahpour Alirezaee Electrical and Computer Engineering Department University of Windsor Windsor Canada Mechanical Automotive and Material Engineering Department University of Windsor Windsor Canada Institute for Transport Studies University of Leeds UK

Accurate lane change prediction can reduce potential accidents and contribute to higher road safety. Adaptive cruise control (ACC), lane departure avoidance (LDA), and lane keeping assistance (LKA) are some conventional modules in advanced driver assistance systems (ADAS). Thanks to vehicle-to-vehicle communication (V2V), vehicles can share traffic information with surrounding vehicles, enabling cooperative adaptive cruise control (CACC). While ACC relies on the vehicle’s sensors to obtain the position and velocity of the leading vehicle, CACC also has access to the acceleration of multiple vehicles through V2V communication. This paper compares the type of information (position, velocity, acceleration) and the number of surrounding vehicles for driver lane change prediction. We trained an LSTM (Long Short-Term Memory) on the HighD dataset to predict lane change intention. Results indicate a significant improvement in accuracy with an increase in the number of surrounding vehicles and the information received from them. Specifically, the proposed model can predict the ego vehicle lane change with 59.15% and 92.43% accuracy in ACC and CACC scenarios, respectively.

关键词：

来源：评论

学校读者我要写书评

暂无评论

On Security-Constrained Bidding of Shared Transportation Hubs for Renewable Fuels and Refined Oil Participating Within Energy, Regulation and Pipeline Logistics Markets

On Security-Constrained Bidding of Shared Transportation Hub...

引用

IEEE Student Conference on Electric Machines and Systems

作者： Shengshi Wang Hongyi Li Danji Huang Kun Li Shichang Cui Xiaomeng Ai Jiakun Fang Jinyu Wen State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China School of Engineering Cardiff University Cardiff UK Department of Electrical and Computer Engineering Iowa State University Ames United States Department of Electrical and Computer Engineering University of Macau Macau China PetroChina ShenZhen New Energy Research Institute Co. Ltd. Shenzhen China

ISBN: (数字)9798350366945

ISBN: (纸本)9798350366952

This paper investigates the security-constrained bidding strategy of the emerging shared transportation hubs for renewable fuels and refined oil (STH-RRs) participating within energy, regulation and pipeline logistics markets. Firstly, to excavate more flexible capability for the power system as well as to increase the revenue of the STH-RR operation company, the model for STH-RR participating in regulation market is established. Secondly, the security-constrained two-stage bidding model is first proposed for STH-RRs to balance the revenue across energy, regulation and pipeline logistics markets. Particularly, to guarantee secure operation of STH-RRs and meet the delivery demand, the rigorous multi-product transportation constraints are considered in both stages. Case studies based on the modified real-world multi-product pipelines in South China validate the proposed method, with the revenue and turnover increase of 14% and 4.7%, respectively, compared with conventional methods.

关键词： Renewable energy sources Uncertainty Oils Pipelines Transportation Regulation Fuels Frequency control Logistics Testing

来源：评论

学校读者我要写书评

暂无评论

TshFNA-Examiner:A Nuclei Segmentation and Cancer Assessment Framework for Thyroid Cytology Image

引用

Journal of Shanghai Jiaotong university(Science) 2024年第6期29卷 945-957页

作者： KE Jing ZHU Junchao YANG Xin ZHANG Haolin SUN Yuxiang WANG Jiayi LU Yizhou SHEN Yiqing LIU Sheng JIANG Fusong HUANG Qin School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Life Sciences and Biotechnology Shanghai Jiao Tong UniversityShanghai 200240China School of Engineering Shanghai Ocean UniversityShanghai 201306China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China Department of Computer Science Johns Hopkins UniversityBaltimore 21218USA Department of Thyroid Breast and Vascular Surgery Shanghai Fourth People’s HospitalShanghai 200434China Department of Endocrinology and Metabolism Shanghai Sixth People’s HospitalShanghai 200233China Department of Pathology Shanghai Sixth People’s HospitalShanghai 200233China

Examining thyroid fine-needle aspiration(FNA)can grade cancer risks,derive prognostic information,and guide follow-up care or *** digitization of biopsy and deep learning techniques has recently enabled computational ***,there is still lack of systematic diagnostic system for the complicated gigapixel cytopathology images,which can match physician-level basic *** this study,we design a deep learning framework,thyroid segmentation and hierarchy fine-needle aspiration(TshFNA)-Examiner to quantitatively profile the cancer risk of a thyroid FNA *** the TshFNA-Examiner,cellular-intensive areas strongly correlated with diagnostic medical information are detected by a nuclei segmentation neural network;cell-level image patches are catalogued following The Bethesda System for Reporting Thyroid Cytopathology(TBSRTC)system,by a classification neural network which is further enhanced by leveraging unlabeled data.A cohort of 333 thyroid FNA cases collected from 2019 to 2022 from I to VI is studied,with pixel-wise and image-wise image patches ***,TshFNA-Examiner is evaluated with comprehensive metrics and multiple tasks to demonstrate its superiority to state-of-the-art deep learning *** average performance of cellular area segmentation achieves a Dice of 0.931 and Jaccard index of *** cancer risk classifier achieves a macro-F1-score of 0.959,macro-AUC of 0.998,and accuracy of 0.959 following *** corresponding metrics can be enhanced to a macro-F1-score of 0.970,macro-AUC of 0.999,and accuracy of 0.970 by leveraging informative unlabeled *** clinical practice,TshFNA-Examiner can help cytologists to visualize the output of deep learning networks in a convenient way to facilitate making the final decision.

关键词： thyroid fine-needle aspiration(FNA)cytology The Bethesda System for Reporting Thyroid Cytopathology(TBSRTC) diagnostic system nuclei segmentation cancer risk classification

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：