检索结果-内蒙古大学图书馆

Second-order topological magneto-optical effects in noncoplanar antiferromagnets

Physical Review B 2022年第17期106卷 174427-174427页

作者： Ping Yang Wanxiang Feng Xiaodong Zhou Xiuxian Yang Yugui Yao Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing 100081 China Laboratory of Quantum Functional Materials Design and Application School of Physics and Electronic Engineering Jiangsu Normal University Xuzhou 221116 China

The second-order magneto-optical effects, represented by Voigt and Schäfer-Hubert effects, are effective methods to detect the spin textures in antiferromagnets, whereas the previous studies are usually limited to collinear antiferromagnets. In noncollinear antiferromagnets, the spin textures characterized by spin chirality have been revealed to play a critical role in many exciting physics. In particular, the first-order topological magneto-optical effects originated from scalar spin chirality have been discovered recently. In this work, using the first-principles calculations and group-theory analysis, we generalize the first-order topological magneto-optical effects to the second-order cases, that is, topological Voigt and Schäfer-Hubert effects, by taking the noncoplanar 3Q spin state of γ−FexMn1−x alloy as an example. The conventional Voigt and Schäfer-Hubert effects are comparatively studied in the collinear 1Q and 2Q spin states of γ−FexMn1−x alloy. In addition, the natural linear birefringence due to crystal anisotropy is discussed in the strained 1Q, 2Q, and 3Q states, and a unique fingerprint for experimentally distinguishing the second-order topological magneto-optical effects and natural linear birefringence is identified. Our work brings a topological insight into the second-order magneto-optical effects in noncoplanar antiferromagnets and also provides γ−FexMn1−x as an attractive material platform for future experimental exploration.

关键词： Magneto-optical effect Antiferromagnets Chiral magnets First-principles calculations

来源：评论

学校读者我要写书评

暂无评论

Tio2 Coated Sio2 Core-Shell Stationary Phase with Uniform and Tunable Tio2 Thickness for High Performance Liquid Chromatography Separation

SSRN

引用

SSRN 2023年

作者： Wang, Dian Wan, Xiang Wang, Jiafei Mangelings, Debby Sun, Yuanshe Li, Tong Xu, Qin Xie, Fazhi Li, Weihua Qu, Qishu Key Laboratory of Functional Molecule Design and Interface Process Anhui Province Engineering Laboratory of Advanced Building Materials School of Materials Science and Chemical Engineering Anhui Jianzhu University Hefei230601 China Department of Analytical Chemistry Applied Chemometrics and Molecular Modelling Vrije Universiteit Brussel Laarbeeklaan 103 BrusselsB-1090 Belgium Dalian Elite Analytical Instruments Co. Ltd. Dalian116023 China College of Chemistry and Chemical Engineering Yangzhou University Yangzhou225002 China Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse School of Environment and Energy Engineering Anhui Jianzhu University Hefei230601 China

In this work, SiO2 core-shell spheres with a dendritic pore structure were used as chromatographic support and TiO2 was coated into the pores of the SiO2@dSiO2 shell using tetrabutyl orthotitanate (TBOT) as the titanium source. By simply prolonging the reaction time, a TiO2 layer with a uniform and controllable thickness was obtained on the surface of SiO2 core-shell spheres by Ostwald ripening. The thickness of the TiO2 layer can be achieved by either controlling the reaction time or controlling the amount of TBOT. When the concentration of TBOT was 0.06 mol L-1, the thickness of the TiO2 layer can be tuned from 15 to about 44 nm by changing the reaction time. When the concentration of TBOT was 0.08 mol L-1, the thickness of the TiO2 layer can be tuned from 21 to about 71 nm by changing the reaction time. C18-derived core-shell spheres with a TiO2 layer thicknesses of 40 nm (C18-SST-0.5-60) and 70 nm (C18-SST-0.7-30) were used as packings to evaluate the effect of TiO2 layer thickness on the chromatographic separation performance. The separation performance of C18-SST-0.5-60 was better than that of C18-SST-0.7-30. The separation efficiency of C18-SST-0.5-60 and C18-SST-0.7-30 for fluorene was 115112 plates m-1 and 83189 plates m-1, respectively. The columns were also used for the separation of basic, acidic and nucleoside mixtures. Both TiO2-coated core-shell packings showed good peak symmetry for basic samples, with peak asymmetry factors below 1.11. The relative standard deviations of the retention time of polycyclic aromatic hydrocarbons and anilines for intraday, interday and column-to-column variation were all lower than 6%. The results demonstrate that the TiO2 based stationary phase possesses great potential for high performance liquid chromatographic separation. © 2023, The Authors. All rights reserved.

关键词： Silica

来源：评论

学校读者我要写书评

暂无评论

U-shaped feature extractor used on mask R-CNN for cell nuclei image segmentation 6

U-shaped feature extractor used on mask R-CNN for cell nucle...

引用

6th Annual International Conference on Network and Information systems for Computers, ICNISC 2020

作者： Zhu, Qing Huang, Xiaoyang Wang, Liansheng Li, Jonathan Fujian Key Laboratory of Sensing and Computing for Smart Cities School of Informatics Xiamen University XiamenFJ 361005 China Department of Geography and Environmental Management Department of Systems Design Engineering University of Waterloo WaterlooONN2L 3G1 Canada

The cell nuclei segmentation of is a challenging task in microscopy image analysis. The problems of noise, small cell nuclei, and few training data samples in the data set will all affect the effectiveness of the model to varying degrees. This paper presents a new approach to nuclear image segmentation based on convolutional neural networks. Our approach is based on Mask R-CNN with some modification, which combines low-level semantic features for model training. In order to make the model specific to each low-level feature map, the attention mechanism was used to assign weights to each low-level feature map, making the model learning more purposeful. Our method achieves an average precision value of 62.8%, which is 2.7% higher than that of the Mask R-CNN (ResNet50) basic model and 6.3% of the Mask R-CNN (ResNet101) basic model. © 2020 Journal of Physics: Conference Series.

关键词： Convolutional neural networks

来源：评论

学校读者我要写书评

暂无评论

Twisting Sliding Mode Control of an Electrostatic MEMS Micromirror for a Laser Scanning System

引用

IEEE/CAA Journal of Automatica Sinica 2019年第4期6卷 1060-1067页

作者： Hui Chen Zhendong Sun Weijie Sun John Tze Wei Yeow the School of Computer and Information Engineering Henan UniversityKaifeng 475000China the Key Laboratory of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190 China the College of Automation Science and Engineering South China University of TechnologyGuangzhou 510641China the Systems Design Engineering University of WaterlooWaterloo N2L3G1Canada IEEE

In this paper,we present a twisting control scheme with proportional-integral-derivative(PID)sliding surface for a two-axis electrostatic torsional micromirror,and the utilization of the proposed scheme in a laser scanning *** experimental results of set-point regulation verify that the proposed scheme provides enhanced transient response and positioning performance as compared to traditional sliding mode *** evaluate the tracking performance of the closed-loop system,triangular waves with different frequencies are used as desired *** the proposed scheme the experimental results verified that the closed-loop controlled micromirror follows the given triangular trajectories precisely.A micromirror-based laser scanning system is developed to obtain *** compared with open-loop control,the experimental results demonstrated that the proposed scheme is able to reduce the distortion of the raster scan,and improve the imaging performance in the presence of cross-coupling effect.

关键词： Electrostatic micromirror imaging microelectromechanical system(MEMS) twisting algorithm

来源：评论

学校读者我要写书评

暂无评论

The Age of Generative AI and AI-Generated Everything

arXiv

引用

arXiv 2023年

作者： Du, Hongyang Niyato, Dusit Kang, Jiawen Xiong, Zehui Zhang, Ping Cui, Shuguang Shen, Xuemin Mao, Shiwen Han, Zhu Jamalipour, Abbas Vincent Poor, H. Kim, Dong In School of Computer Science and Engineering Nanyang Technological University Singapore639798 Singapore School of Automation Guangdong University of Technology Key Laboratory of Intelligent Information Processing and System Integration of IoT Ministry of Education Guangzhou510006 China Guangdong-HongKong-Macao Joint Laboratory for Smart Discrete Manufacturing Guangzhou510006 China Pillar of Information Systems Technology and Design Singapore University of Technology and Design Singapore487372 Singapore State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications China Chinese University of Hong Kong Shenzhen China Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada Department of Electrical and Computer Engineering Auburn University AuburnAL36849-5201 United States Department of Electrical and Computer Engineering University of Houston HoustonTX77004 United States Department of Computer Science and Engineering Kyung Hee University Seoul446-701 Korea Republic of School of Electrical and Information Engineering University of Sydney SydneyNSW2006 Australia Department of Electrical and Computer Engineering Princeton University PrincetonNJ08544 United States Department of Electrical and Computer Engineering Sungkyunkwan University Suwon16419 Korea Republic of

Generative AI (GAI) has emerged as a significant advancement in artificial intelligence, renowned for its language and image generation capabilities. This paper presents "AIGenerated Everything" (AIGX), a concept that extends GAI beyond mere content creation to real-time adaptation and control across diverse technological domains. In networking, AIGX collaborates closely with physical, data link, network, and application layers to enhance real-time network management that responds to various system and service settings as well as application and user requirements. Networks, in return, serve as crucial components in further AIGX capability optimization through the AIGX lifecycle, i.e., data collection, distributed pre-training, and rapid decision-making, thereby establishing a mutually enhancing interplay. Moreover, we offer an in-depth case study focused on power allocation to illustrate the interdependence between AIGX and networking systems. Through this exploration, the article analyzes the significant role of GAI for networking, clarifies the ways networks augment AIGX functionalities, and underscores the virtuous interactive cycle they form. This article paves the way for subsequent future research aimed at fully unlocking the potential of GAI and networks. © 2023, CC BY.

关键词： Decision making

来源：评论

学校读者我要写书评

暂无评论

Rapid FSS design Method Based on Fourier Transform

Rapid FSS Design Method Based on Fourier Transform

引用

Progress in Electromagnetic Research Symposium (PIERS)

作者： Huanran Qiu Jiaqi Han Qiang Feng Rui Xi Ying Li Hongsheng Chen Bin Zheng Long Li Hangzhou Institute of Technology Xidian University Hangzhou China Key Laboratory of High-Speed Circuit Design and EMC of Ministry of Education School of Electronic Engineering Xidian University Xi’an China Interdisciplinary Center for Quantum Information State Key Laboratory of Extreme Photonics and Instrumentation ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou China International Joint Innovation Center The Electromagnetics Academy at Zhejiang University Zhejiang University Haining China Key Lab of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Jinhua China Institute of Zhejiang University Zhejiang University Jinhua China Shaoxing Institute of Zhejiang University Zhejiang University Shaoxing China

ISBN: (数字)9798350375909

ISBN: (纸本)9798350375916

This article presents a rapid frequency selective surface (FSS) design method based on Fourier transform. The method aims to overcome the complexity and reduce the time consumption associated with the massive input simulation datasets in traditional design processes, providing an efficient and automated design solution. By introducing Fourier transform, the amount of simulation datasets can be significantly simplified, enhancing the speed and accuracy of neural network training. The method improves precision and speed in handling tasks with multiple parameters, offering an effective tool for fast FSS design. With the aid of neural network construction, users only need to input the desired simulation result curve, and the neural network model will quickly output optimal FSS structure parameters. This approach ensures design accuracy and stability while greatly increasing the efficiency of FSS design.

关键词： Training Fourier transforms Accuracy design methodology Simulation Neural networks Stability analysis

来源：评论

学校读者我要写书评

暂无评论

Unleashing the Power of Edge-Cloud Generative AI in Mobile Networks: A Survey of AIGC Services

arXiv

引用

arXiv 2023年

作者： Xu, Minrui Du, Hongyang Niyato, Dusit Kang, Jiawen Xiong, Zehui Mao, Shiwen Han, Zhu Jamalipour, Abbas Kim, Dong In Shen, Xuemin Leung, Victor C.M. Poor, H. Vincent The School of Computer Science and Engineering Nanyang Technological University Singapore639798 Singapore The School of Automation Guangdong University of Technology Key Laboratory of Intelligent Information Processing and System Integration of IoT Ministry of Education Guangzhou510006 China Guangdong-HongKong-Macao Joint Laboratory for Smart Discrete Manufacturing Guangzhou510006 China The Pillar of Information Systems Technology and Design Singapore University of Technology and Design Singapore487372 Singapore The Department of Electrical and Computer Engineering Auburn University AuburnAL36849-5201 United States The Department of Electrical and Computer Engineering University of Houston HoustonTX77004 United States The Department of Computer Science and Engineering Kyung Hee University Seoul446-701 Korea Republic of The School of Electrical and Information Engineering University of Sydney SydneyNSW2006 Australia The Department of Electrical and Computer Engineering Sungkyunkwan University Suwon16419 Korea Republic of The Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada The College of Computer Science and Software Engineering Shenzhen University Shenzhen518061 China The Department of Electrical and Computer Engineering The University of British Columbia VancouverBCV6T 1Z4 Canada The Department of Electrical and Computer Engineering Princeton University PrincetonNJ08544 United States

Artificial Intelligence-Generated Content (AIGC) is an automated method for generating, manipulating, and modifying valuable and diverse data using AI algorithms creatively. This survey paper focuses on the deployment of AIGC applications, e.g., ChatGPT and Dall-E, at mobile edge networks, namely mobile AIGC networks, that provide personalized and customized AIGC services in real time while maintaining user privacy. We begin by introducing the background and fundamentals of generative models and the lifecycle of AIGC services at mobile AIGC networks, which includes data collection, training, fine-tuning, inference, and product management. We then discuss the collaborative cloud-edge-mobile infrastructure and technologies required to support AIGC services and enable users to access AIGC at mobile edge networks. Furthermore, we explore AIGC-driven creative applications and use cases for mobile AIGC networks. Additionally, we discuss the implementation, security, and privacy challenges of deploying mobile AIGC networks. Finally, we highlight some future research directions and open issues for the full realization of mobile AIGC networks. © 2023, CC BY.

关键词： Life cycle

来源：评论

学校读者我要写书评

暂无评论

Age-Friendly Protocol to Support Investigations of Autonomous Driving Disengagement on Driver Safety 24th

Age-Friendly Protocol to Support Investigations of Autonomou...

引用

24th International Conference on Human-Computer Interaction, HCI International, HCII 2022

作者： Brightman, Kirsten Van Benthem, Kathleen Wallace, Bruce Herdman, Chris Sloan, Will Sloan, Tom Lochbihler, Aidan Knoefel, Frank Marshall, Shawn Advanced Cognitive Engineering Laboratory Faculty of Arts and Social Sciences Carleton University OttawaONK1S 5B6 Canada Department of Systems and Computer Engineering Faculty of Engineering and Design Carleton University OttawaONK1S 5B6 Canada AGE-WELL NIH—SAM OttawaONK1N 5C8 Canada Bruyère Research Institute OttawaONK1N 5C8 Canada Faculty of Medicine University of Ottawa OttawaONK18L6 Canada Bruyère Continuing Care OttawaONK1N 5C8 Canada

ISBN: (纸本)9783031063930

Driving enables access to meaningful occupations which determine health in older age [1] and the automotive industry is investing significantly in technology to assist and automate the driving task [2]. Little is known regarding the challenges posed by this new technology on the engagement of older drivers [3–5]. Immediate ecologically-valid research is needed to assess the impact of autonomous driving features on the engagement and safety of drivers [6, 7]. However, driving simulation has a high prevalence of simulator sickness and dropout for older participants [8, 9]. We present a novel protocol and framework where onboard sensor data is used to create and tune risk prediction models. Our approach incorporates passive sensing and indices of older driver engagement with a goal to mitigate negative simulator effects and validate results against semi-autonomous vehicle data. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Autonomous vehicles

来源：评论

学校读者我要写书评

暂无评论

2D/2D atomic double-layer WS_(2)/Nb_(2)O_(5)shell/core nanosheets with ultrafast interfacial charge transfer for boosting photocatalytic H_(2)evolution

引用

Chinese Chemical Letters 2021年第10期32卷 3128-3132页

作者： Bo Lin Hao Chen Yao Zhou Xiao Luo Dan Tian Xiaoqing Yan Ruihuan Duan Jun Di Lixing Kang Aimin Zhou Guidong Yang Yonghui Li Jiadong Zhou Zheng Liu Fucai Liu School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Wuhan Second Ship Design and Research Institute Wuhan 430200China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore College of Materials Science and Engineering Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesNanjing Forestry UniversityNanjing 210037China XJTU-Oxford International Joint Laboratory for Catalysis School of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi’an 710049China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Department of Physics and Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology School of ScienceTianjin UniversityTianjin 300350China Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systemsand School of PhysicsBeijing Institute of TechnologyBeijing 100081China

Low-efficiency charge transfer is a critical factor to limit the photocatalytic H_(2)evolution activity of semiconductor *** interface design is a promising approach to achieve high chargetransfer efficiency for ***,a new 2 D/2 D atomic double-layer WS_(2)/Nb_(2)O_(5)shell/core photocatalyst(DLWS/Nb_(2)O_(5))is *** atom-resolved HAADF-STEM results unravel the presence of an unusual 2 D/2 D shell/core interface in DLWS/Nb_(2)O_(5).Taking advantage of the advanced femtosecond-resolved ultrafast TAS spectra,the average lifetime of charge carriers for DLWS/Nb_(2)O_(5)(180.97 ps)is considerably shortened as compared to that of Nb_(2)O_(5)(230.50 ps),strongly indicating that the 2 D/2 D shell/core interface enables DLWS/Nb_(2)O_(5)to achieve ultrafast charge transfer from Nb_(2)O_(5)to atomic double-layer WS_(2),thus yielding a high photocatalytic H_(2)evolution rate of 237.6 mmol/h,up to10.8 times higher than that of pure Nb_(2)O_(5)*** study will open a new window for the development of high-efficient photocatalytic systems through the interface design.

关键词： 2D/2D shell/core interface Atomic double-layer WS_(2) Nb_(2)O_(5)nanosheet Charge transfer Photocatalytic H_(2)evolution

来源：评论

学校读者我要写书评

暂无评论

Observation of Electric Hysteresis, Polarization Oscillation, and Pyroelectricity in Nonferroelectric p−n Heterojunctions

引用

Physical Review Letters 2023年第19期130卷 196801-196801页

作者： Yucheng Jiang Xinglong Ma Lin Wang Jinlei Zhang Zhichao Wang Run Zhao Guozhen Liu Yang Li Cheng Zhang Chunlan Ma Yaping Qi Lin Wu Ju Gao Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and Technology Suzhou University of Science and Technology Suzhou 215009 China School of Physics Nanjing University Nanjing 210093 China School of Materials Science and Engineering Shanghai University Shanghai 200444 China Macau Institute of Systems Engineering Macau University of Science and Technology Macau 999078 China Advanced Institute for Materials Research Tohoku University Sendai 980-8577 Japan Science Mathematics and Technology Singapore University of Technology and Design 8 Somapah Road Singapore 487372 Singapore Institute of High Performance Computing Agency for Science Technology and Research 1 Fusionopolis Way #16-16 Connexis Singapore 138632 Singapore School for Optoelectronic Engineering Zaozhuang University Shandong 277160 China

The switchable electric polarization is usually achieved in ferroelectric materials with noncentrosymmetric structures, which opens exciting opportunities for information storage and neuromorphic computing. In another polar system of p−n junction, there exists the electric polarization at the interface due to the Fermi level misalignment. However, the resultant built-in electric field is unavailable to manipulate, thus attracting less attention for memory devices. Here, we report the interfacial polarization hysteresis (IPH) in the vertical sidewall van der Waals heterojunctions of black phosphorus and quasi-two-dimensional electron gas on SrTiO3. A nonvolatile switching of electric polarization can be achieved by reconstructing the space charge region (SCR) with long-lifetime nonequilibrium carriers. The resulting electric-field controllable IPH is experimentally verified by electric hysteresis, polarization oscillation, and pyroelectric effect. Further studies confirm the transition temperature of 340 K, beyond which the IPH vanishes. The second transition is revealed with the temperature dropping below 230 K, corresponding to the sharp improvement of IPH and the freezing of SCR reconstruction. This work offers new possibilities for exploring the memory phenomena in nonferroelectric p−n heterojunctions.

关键词： Electric polarization Electroresistance Pyroelectricity

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：