检索结果-内蒙古大学图书馆

Towards the performance limit of catenary meta-optics via field-driven optimization

Opto-Electronic Advances 2024年第5期7卷 33-42页

作者： Siran Chen Yingli Ha Fei Zhang Mingbo Pu Hanlin Bao Mingfeng Xu Yinghui Guo Yue Shen Xiaoliang Ma Xiong Li Xiangang Luo National Key Laboratory of Optical Field Manipulation Science and Technology Chinese Academy of SciencesChengdu 610209China State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China Research Center on Vector Optical Fields Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China Department of Electrical and Computer Engineering University of California Los Angeles(UCLA)Los AngelesCalifornia 90095USA

Catenary optics enables metasurfaces with higher efficiency and wider bandwidth,and is highly anticipated in the imaging system,super-resolution lithography,and broadband ***,the periodic boundary approximation without considering aperiodic electromagnetic crosstalk poses challenges for catenary optical devices to reach their performance ***,perfect control of both local geometric and propagation phases is realized through field-driven optimization,in which the field distribution is calculated under real boundary *** from other optimization methods requiring a mass of iterations,the proposed design method requires less than ten iterations to get the efficiency close to the optimal *** on the library of shape-optimized catenary structures,centimeter-scale devices can be designed in ten seconds,with the performance improved by ~15%.Furthermore,this method has the ability to extend catenary-like continuous structures to arbitrary polarization,including both linear and elliptical polarizations,which is difficult to achieve with traditional design *** provides a way for the development of catenary optics and serves as a potent tool for constructing high-performance optical devices.

关键词： catenary optics catenary structures field-driven optimization

来源：评论

学校读者我要写书评

暂无评论

Budget-Constrained Sizing of Renewable and Energy Storage systems for Farm-Scale Ammonia Production Within the Food-Energy-Water Nexus

Budget-Constrained Sizing of Renewable and Energy Storage Sy...

引用

IEEE Green Technologies Conference (IEEE-Green)

作者： Xuebo Liu Alex Modarresi Lawryn Kiboma Hongyu Wu John Symons Mary Hill Mike Wiegers Department of Electrical and Computer Engineering Kansas State University Manhattan KS USA Department of Computer Science California State University Northridge CA USA National Renewable Energy Laboratory Golden CO USA Department of Philosophy Center for Cyber-Social Dynamics University of Kansas Lawrence KS USA Department of Geology University of Kansas Lawrence KS USA

In the transition toward sustainable agriculture, farms have emerged as eco-friendly pioneers, harnessing clean hybrid wind and solar systems to improve farm performance. A concern in this paradigm is the effective sizing of renewable energy systems to ensure optimal energy use within budget considerations. This research focuses on optimizing renewable energy sizing in small-scale ammonia production to meet specific farm demands and enhance local resilience, emphasizing the interplay between environmental and economic factors. These findings promise increased energy efficiency and sustainability in this innovative agricultural sector. Additionally, our approach considers small-scale ammonia plant needs and the dynamic relationships between ammonia, water, and farm demands. Sim-ulations demonstrate substantial cost savings in farm electricity consumption. Specifically, scenarios with renewable energy integration in the farm can reduce at least 13% electricity cost compared to a grid-dependent system in the 15-year simulation.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Classification of Iris Plant Using Perceptron Neural Network 1

引用

2nd International Conference on Advanced Intelligent systems for Sustainable Development, AI2SD 2019

作者： Datsi, Toufik El Oirrak, Ahmed Aznag, Khalid Faculty of Sciences Semlalia Cadi Ayyad University Computer Science Department Computer Systems Engineering Laboratory Marrakesh Morocco

ISBN: (数字)9783030366742

ISBN: (纸本)9783030366735

Classification is a prediction technique from the field of supervised learning where the goal is to predict group of membership for data instances. It is one of the fundamental tools of machine learning. Perceptron Neural Network is the first model of Artificial Neural Network implemented to simplify some problems of classification. In this paper we present an approach based on perceptron Neural Network to classified Iris Plant on the basis of the following measurements: sepal length, sepal width, petal length, and petal width. The architecture used in this work is multiclass perceptron with the One-Versus-All (OVA) strategy and the Stochastic gradient descent algorithm learning for training the perceptron. © 2020, Springer Nature Switzerland AG.

关键词： Classification (of information)

来源：评论

学校读者我要写书评

暂无评论

Joint inference of multiple graphs from matrix polynomials

The Journal of Machine Learning Research

引用

The Journal of Machine Learning Research 2022年第1期23卷 3302-3336页

作者： Madeline Navarro Yuhao Wang Antonio G. Marques Caroline Uhler Santiago Segarra Department of Electrical and Computer Engineering Rice University Houston TX Institute for Interdisciplinary Information Sciences Tsinghua University and Shanghai Qi Zhi Institute Haidian District Beijing China Department of Signal Theory and Communications King Juan Carlos University Madrid Spain Department of Electrical Engineering & Computer Science Department of Institute for Data Systems and Society Massachusetts Institute of Technology Cambridge MA

Inferring graph structure from observations on the nodes is an important and popular network science task. Departing from the more common inference of a single graph, we study the problem of jointly inferring multiple graphs from the observation of signals at their nodes (graph signals), which are assumed to be stationary in the sought graphs. Graph stationarity implies that the mapping between the covariance of the signals and the sparse matrix representing the underlying graph is given by a matrix polynomial. A prominent example is that of Markov random fields, where the inverse of the covariance yields the sparse matrix of interest. From a modeling perspective, stationary graph signals can be used to model linear network processes evolving on a set of (not necessarily known) networks. Leveraging that matrix polynomials commute, a convex optimization method along with sufficient conditions that guarantee the recovery of the true graphs are provided when perfect covariance information is available. Particularly important from an empirical viewpoint, we provide high-probability bounds on the recovery error as a function of the number of signals observed and other key problem parameters. Numerical experiments demonstrate the effectiveness of the proposed method with perfect covariance information as well as its robustness in the noisy regime.

关键词： network topology inference graph signal processing spectral graph theory multi-layer graphs network diffusion processes

来源：评论

学校读者我要写书评

暂无评论

How does a Rational Agent Act in an Epidemic?

How does a Rational Agent Act in an Epidemic?

引用

IEEE Conference on Decision and Control

作者： S. Yagiz Olmez Shubham Aggarwal Jin Won Kim Erik Miehling Tamer Başar Matthew West Prashant G. Mehta Coordinated Science Lab University of Illinois at Urbana-Champaign Urbana IL Department of Mechanical Science and Engineering Coordinated Science Laboratory University of Illinois at Urbana-Champaign (UIUC) Department of Electrical and Computer Engineering Coordinated Science Laboratory UIUC Department of Mechanical Science and Engineering UIUC

ISBN: (数字)9781665467612

ISBN: (纸本)9781665467629

The evolution of a disease in a large population is a function of the top-down policy measures from a centralized planner and the self-interested decisions (to be socially active) of individual agents in a large heterogeneous population. This paper is concerned with understanding the latter based on a mean-field type optimal control model. Specifically, the model is used to investigate the role of partial information on an agent’s decision-making and study the impact of such decisions by a large number of agents on the spread of the virus in the population. The motivation comes from the presymptomatic and asymptomatic spread of the COVID-19 virus, where an agent unwittingly spreads the virus. We show that even in a setting with fully rational agents, limited information on the viral state can result in epidemic growth.

关键词： COVID-19 Epidemics Sociology Decision making Optimal control Statistics Diseases

来源：评论

学校读者我要写书评

暂无评论

Proximal quantum control of spin and spin ensemble with localized control field from skyrmions

引用

Physical Review Applied 2024年第6期22卷 064077-064077页

作者： Md Fahim F. Chowdhury Mohamad Niknam Md Mahadi Rajib Louis-S. Bouchard Jayasimha Atulasimha Department of Mechanical and Nuclear Engineering Virginia Commonwealth University Richmond VA 23284 USA Department of Chemistry and Biochemistry University of California Los Angeles 607 Charles E. Young Drive East Los Angeles CA 90095-1059 USA Center for Quantum Science and Engineering University of California Los Angeles Los Angeles CA 90095 USA Current affiliation: Department of Physics and Astronomy University of California Los Angeles Los Angeles CA 90095 USA Department of Electrical and Computer Engineering Virginia Commonwealth university Richmond VA 23284 USA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA Department of Electrical Engineering and Computer Sciences University of California Berkeley Berkeley CA 94720-1770 USA

Selective control of individual spin qubits is needed for scalable quantum computing based on spin states. Achieving high-fidelity in both single-qubit and two-qubit gates, essential components of universal quantum computers, necessitates highly localized control fields. These fields must be capable of addressing specific spin qubits while minimizing gate errors and crosstalk in adjacent qubits. Overcoming the challenge of generating a localized radio-frequency magnetic field, in the absence of elementary magnetic monopoles, we introduce a technique that combines divergent and convergent nanoscale magnetic skyrmions. This approach produces a precise control field that manipulates spin qubits with high fidelity. We propose the use of 2D skyrmions, which are much easier to fabricate than 3D hedgehog structures. The latter are considered emergent magnetic monopoles, but their fabrication is challenging. In contrast, 2D skyrmions can be created with use of standard semiconductor-foundry processes and offer effective magnetic field confinement in two dimensions. Our comparative analysis of the density-matrix evolution and gate fidelities in scenarios involving proximal skyrmions and nanomagnets indicates potential gate fidelities surpassing 99.95% for π/2 gates and 99.90% for π gates. The average field induced at the nearest neighboring qubit by skyrmions is 0.0332 mT along the x axis (200 nm), while it is 0.507 mT for the nanomagnet case. Notably, the skyrmion configuration generates a significantly lower field on neighboring spin qubits, i.e., 15 times smaller field or approximately 23.5 dB compared to nanomagnets that produce the same field at the target qubit, making it a more-suitable candidate for scalable quantum control architectures by reducing disturbances in adjacent qubits.

关键词： Nanocrystals

来源：评论

学校读者我要写书评

暂无评论

MULTI-FREQUENCY NMM3D SIMULATIONS OF WAVE PROPAGATION IN VEGETATION FOR REMOTE SENSING OF SOIL MOISTURE

MULTI-FREQUENCY NMM3D SIMULATIONS OF WAVE PROPAGATION IN VEG...

引用

2021 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2021

作者： Gu, Weihui Tsang, Leung Colliander, Andreas Yueh, Simon Radiation Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States Jet Propulsion Laboratory California Institute of Technology PasadenaCA91109 United States

ISBN: (纸本)9781665403696

To investigate the feasibility of using multi-frequency to further improve the soil moisture retrieval, the recently developed hybrid method is used to perform full-wave simulations of a wheat field at three different frequencies of L-, S-, and C-bands. In the hybrid method, the multiple scattering within a single wheat plant is first captured using the T-matrix based on the full-wave solutions of HFSS. In the second step, the scatterings among different plants are considered using the Foldy-Lax equations of multiple scattering theory (MST). The transmission of microwaves through wheat field at the L-, S- and C-bands are calculated using the hybrid method. Results show that: (1) the transmission obtained from the full-wave simulations is much larger than those computed from the radiative transfer equations (RTE) model, (2) the hybrid method transmission has a weaker frequency dependence than those of the RTE, and (3) the attenuation caused by the vegetation layer would saturate with an increase in frequency. © 2021 IEEE

关键词： Frequency dependence C-band Computational modeling Soil moisture Scattering Vegetation mapping Microwave theory and techniques

来源：评论

学校读者我要写书评

暂无评论

Near/Far-Field Channel Estimation For Terahertz systems With ELAAs: A Block-Sparse-Aware Approach

arXiv

引用

arXiv 2024年

作者： Wang, Hongwei Fang, Jun Duan, Huiping Li, Hongbin National Key Laboratory of Wireless Communications University of Electronic Science and Technology of China Chengdu611731 China School of Information and Communications Engineering University of Electronic Science and Technology of China Chengdu611731 China Department of Electrical and Computer Engineering Stevens Institute of Technology HobokenNJ07030 United States

Millimeter wave/Terahertz (mmWave/THz) communication with extremely large-scale antenna arrays (ELAAs) offers a promising solution to meet the escalating demand for high data rates in next-generation communications. A large array aperture, along with the ever increasing carrier frequency over the mmWave/THz bands, leads to a large Rayleigh distance. As a result, the traditional planar-wave assumption may not hold valid for mmWave/THz systems featuring ELAAs. In this paper, we consider the problem of hybrid near/far-field channel estimation by taking spherical wave propagation into account. By analyzing the coherence properties of any two near-field steering vectors, we prove that the hybrid near/far-field channel admits a blocksparse representation on a specially designed unitary matrix. Specifically, the percentage of nonzero elements of such a blocksparse representation is in the order of 1/pN, which tends to zero as the number of antennas, N, grows. Such a block-sparse representation allows to convert channel estimation into a blocksparse signal recovery problem. Simulation results are provided to verify our theoretical results and illustrate the performance of the proposed channel estimation approach in comparison with existing state-of-the-art methods. Copyright © 2024, The Authors. All rights reserved.

关键词： Channel estimation

来源：评论

学校读者我要写书评

暂无评论

Spin current leakage and Onsager reciprocity in interfacial spin-charge interconversion

arXiv

引用

arXiv 2024年

作者： Manchon, Aurélien Shi, Shuyuan Yang, Hyunsoo Aix-Marseille Université CNRS CINaM Marseille France Department of Electrical and Computer Engineering National University of Singapore 117576 Singapore Fert Beijing Institute MIIT Key Laboratory of Spintronics School of Integrated Circuit Science and Engineering Beihang University Beijing100191 China

Experimental investigations of spin-charge interconversion in magnetic bilayers comprising a ferromagnet adjacent to a topological insulator have reported scattered results on the spin-charge and charge-spin conversion efficiency. Attempting to reconcile these contradicting experimental results, we develop a phenomenological theory of spin-charge interconversion accounting for both interfacial interconversion through the spin galvanic effect, also called the Rashba-Edelstein effect, as well as bulk interconversion via the spin Hall effect. We find that the spin current leakage into the nonmagnetic metal plays a central role during the spin-to-charge and charge-to-spin conversion, leading to dissymmetric interconversion processes. In particular, spin-to-charge conversion is much less sensitive to the spin current absorption in the nonmagnetic metal than charge-to-spin conversion. This suggests that spin pumping is a more trustable technique to extract the interfacial Rashba parameter than spin-orbit torque. © 2024, CC BY.

关键词： Conversion efficiency

来源：评论

学校读者我要写书评

暂无评论

Microcomb based silicon photonics data link with 100Gbps/Lane PAM4 transmission

Microcomb based silicon photonics data link with 100Gbps/Lan...

引用

CLEO: science and Innovations, S and I 2022

作者： Shu, Haowen Shen, Bitao Chang, Lin Tao, Yuansheng Xie, Weiqiang Jin, Ming Netherton, Andrew Zhang, Xuguang Qin, Jun Chen, Ruixuan Yu, Shaohua Wang, Xingjun Bowers, John E. State Key Laboratory of Advanced Optical Communications System and Networks Peking University Beijing100871 China Department of Electrical and Computer Engineering University of California Santa BarbaraCA93106 United States Peng Cheng Laboratory Shenzhen518055 China Frontiers Science Center for Nano-optoelectronics Peking University Beijing100871 China

We achieve 100 Gbps/Lane PAM4 transmission by employing an AlGaAsOI microcomb source and silicon modulators. With 20 parallel wavelength channels utilized at C-band, an aggregate data rate of 2 Tbit/s is achieved. ... 详细信息

ISBN: (纸本)9781557528209

关键词： Gallium compounds

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：