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Data Driven Control and Learning systems (DDCLS)

作者： Xinyu Zhao Na Qin Jie Huang Yongchen Miao the Institute of Systems Science and Technology Southwest Jiaotong University Chengdu China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China Harbin Shipping School Harbin China

ISBN: (数字)9781728159225

ISBN: (纸本)9781728159232

In order to settle the complex problem of layout of spatial pipeline, the diameter of pipeline is taken as the distance between adjacent scattered points, and the spatial layout including obstacles is approximated as a three-dimensional diagram of scattered points. A-star algorithm is used to search an optimal pipelines path from the three-dimensional diagram of scattered points. However, when traditional A-star algorithm addresses pre-selected points that are the same cost, it selects pre-selected points randomly. In view of the disadvantages, an adaptive A-star algorithm is proposed based on the traditional A-star algorithm, in this paper. The adaptive A-star algorithm selects more reasonable pre-selected point according to the surrounding environment and situation of pre-selected point , so as to achieve the requirements of the shortest pipeline and the fewest inflection point. Finally, the experimental simulation shows that the adaptive A-star algorithm has better performance than the traditional A-star algorithm.

关键词： Pipelines Path planning Layout Robots Heuristic algorithms Robot kinematics Optimization

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11× temporal compression in an ultra-silicon-rich nitride chip

11× temporal compression in an ultra-silicon-rich nitride c...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Ju Won Choi Ezgi Sahin Byoung-Uk Sohn George F. R. Chen Doris K. T. Ng Anuradha M. Agarwal Lionel C. Kimerling Dawn T. H. Tan Photonics Devices and System Group SUTD-MIT International Design Center Singapore University of Technology and Design Singapore Singapore Institute of Microelectronics A*STAR (Agency for Science Technology and Research) Singapore Singapore Microphotonics Center Massachusetts Institute of Technology Cambridge MA Materials Research Laboratory Massachusetts Institute of Technology Cambridge MA Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA

Strong temporal compression in an integrated ultra-silicon-rich nitride temporal compressor consisting of separate nonlinear and anomalously dispersive stages is demonstrated. 11× compression of 5.8ps pulses at a... 详细信息

ISBN: (纸本)9781943580910

关键词： Atomic layer deposition Bandpass filters Chemical vapor deposition Electron beam lithography Pulse compression Self phase modulation

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Dual-Regulation of Α-Moc Quantum Dots and Mo-N-C Sites to Achieve High Photoelectric Conversion Performance in Solar Cell

SSRN

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SSRN 2022年

作者： Yao, Jixin Wang, Wen Wang, Jie Meng, Ying Lu, Shibin Tong, Xiaowei Du, Feng Yang, Li Xu, Haifeng Yang, Bo Tang, Huaibao Li, Guang Anhui Province Key Laboratory of simulation and design for Electronic information system Universities Joint Key Laboratory of photoelectric detection Science and Technology in Anhui Province Hefei Normal University Hefei230601 China School of Materials Science and Engineering Anhui Key Laboratory of Information Materials and Devices Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Institute of Physical Science and Information Technology Anhui University Hefei230601 China Institute of Materials Science and Devices School of Materials Science and Engineering Suzhou University of Science and Technology Suzhou215011 China School of Information Engineering Suzhou University Suzhou234000 China School of Physics and Electronic Information Huaibei Normal University Huaibei235000 China

Constructing low-price yet high-efficiency counter electrode (CE) materials for dye-sensitized solar cells (DSSCs) is vital in energy conversion fields. Herein, α-MoC quantum dots (QD) decorated with Mo-N-C site is encapsulated in a unique carbon flower structure (α-MoCQD@NCF) as efficient CE. The α-MoCQD@NCF CE in DSSC exhibits high power conversion efficiency (PCE) with up to 9.12%, which greatly exceeds the pure Pt (7.53%). The electron microscope reveals that α-MoCQD@NCF is an ultrathin-hierarchical hollow structure, which facilitates the adequate contact of the electrolyte. Simultaneously, the ultra-small size of QD is advantageous for maximizing the utilization of active sites to accelerate the tri-iodide reduction reaction. Additionally, theory calculations indicate that atomic engineering Mo-N-C sites coupled with α-MoC quantum dots can complement and reinforce each other to transfer electrons to the carbon matrix. This electronic modulation synergistically accelerates the electron transport on the surface of CE, restraining iodide ion coupling and optimizing reaction kinetics. © 2022, The Authors. All rights reserved.

关键词： Nanocrystals

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Dual Electrical-Behavior Regulation of Α-Moc Quantum Dots and Mo-N-C Sites for High Photoelectric Conversion Performance of Solar Cells

SSRN

引用

SSRN 2022年

作者： Yao, Jixin Wang, Wen Wang, Jie Meng, Ying Lu, Shibin Wang, Haibo Du, Feng Yang, Li Yang, Bo Tang, Huaibao Xu, Haifeng Li, Guang Anhui Province Key Laboratory of Simulation and Design for Electronic Information System Universities Joint Key Laboratory of Photoelectric Detection Science and Technology in Anhui Province Hefei Normal University Hefei230601 China School of Materials Science and Engineering Anhui Key Laboratory of Information Materials and Devices Key Laboratory of Structure and Functional Regulation of Hybrid Materials Ministry of Education Institute of Physical Science and Information Technology Anhui University Hefei230601 China Institute of Materials Science and Devices School of Materials Science and Engineering Suzhou University of Science and Technology Suzhou215011 China School of Information Engineering Suzhou University Suzhou234000 China School of Physics and Electronic Information Huaibei Normal University Huaibei235000 China

Constructing low-price yet high-efficiency counter electrode (CE) materials for dye-sensitized solar cells (DSSCs) is vital in the field of energy conversion. Herein, α-MoC quantum dots (QDs) decorated with Mo-N-C sites are encapsulated in a unique carbon flower structure (α-MoCQD@NCF) as efficient CE. The α-MoCQD@NCF CE in DSSC exhibits high power conversion efficiency (PCE) with up to 9.12%, which greatly exceeds that of pure Pt (7.53%). Electron microscopy reveals that α-MoCQD@NCF is an ultrathin-hierarchical hollow structure, which facilitates the adequate contact of the electrolyte. Simultaneously, the ultra-small size of the QDs is advantageous for maximizing the utilization of active sites to accelerate the triiodide reduction reaction. Additionally, theoretical calculations indicate that atomically engineered Mo-N-C sites combined with α-MoC quantum dots can complement and reinforce each other to transfer electrons to the carbon matrix. Therefore, through the synergistic effect of the dual regulation of electron transfer rate and pathway by the two structures, the electron transfer on the CE surface is accelerated, the iodide ion coupling is suppressed and the reaction kinetics are optimized. It not only offers a rational approach to develop low-cost yet highly active electrode material, but also opens an avenue for other energy-related fields. © 2022, The Authors. All rights reserved.

关键词： Electrocatalysis

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Effects of Organosilane-modified PCE on the Fluidity and Hydration Properties of Cement-Fly Ash Composite Binder

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Journal of Wuhan University of technology(Materials science) 2020年第6期35卷 1081-1089页

作者： HE Yan LIU Shuhua JI Tao KONG Yaning SHUI Liangliang School of Civil Engineering Suzhou University of Science and TechnologySuzhou 215011China State Key Laboratory of Green Building Materials China Building Materials AcademyBeijing 100024China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Water System Science for Sponge City Construction Wuhan UniversityWuhan 430072China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China School of Architecture and Engineering Nanjing Institute of TechnologyNanjing 211167China China West Construction Academy of Building Materials Chengdu 610000China Shanghai Municipal Engineering Design Institute(Group)Co.Ltd. Shanghai 200092China

Effects of organosilane-modified PCE (OS-PCE) on the fluidity and the hydration properties of cement-fly ash (FA) composite binder were systematically *** experimental results show that OS-PCE possesses respectively 36.98% and 36.67% higher saturated adsorption amount on cement and FA,in comparison with ordinary PCE,and can contribute to higher fluidity of cement-FA composite *** addition of OS-PCE retards hydration process of cement-FA composite binder proportionally with the dosage of OS-PCE,but promotes the hydration kinetics of the composite *** reactivity enhancement is attributed to the well-dispersed FA by OS-PCE,which provides more nucleation sites for the reaction of heterogeneous C-S-H and enhances the contact with water to react with CH forming pozzolanic ***-distributed hydration products are exhibited in the hardened binder added with OS-PCE,with a large number of hydrated gels uniformly fill in the pores and gaps,which improves the compaction of the hardened structure.

关键词： cement fly ash organosilane-modified PCE fluidity hydration properties

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Communication-Assisted Sensing in 6G Networks

arXiv

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arXiv 2023年

作者： Dong, Fuwang Liu, Fan Lu, Shihang Xiong, Yifeng Zhang, Qixun Feng, Zhiyong Gao, Feifei School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen518055 China School of Information and Electronic Engineering Beijing University of Posts and Telecommunications Beijing100876 China Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing100876 China Department of Automation Tsinghua University Beijing100876 China

Exploring the mutual benefit and reciprocity of sensing and communication (S&C) functions is fundamental to realizing deeper integration for integrated sensing and communication (ISAC) systems. This paper investigates a novel communication-assisted sensing (CAS) system within 6G perceptive networks, where the base station actively senses the targets through device-free wireless sensing and simultaneously transmits the estimated information to end-users. In such a CAS system, we first establish an optimal waveform design framework based on the rate-distortion (RD) and source-channel separation (SCT) theorems. After analyzing the relationships between the sensing distortion, coding rate, and communication channel capacity, we propose two distinct waveform design strategies in the scenario of target impulse response estimation. In the separated S&C waveforms scheme, we equivalently transform the original problem into a power allocation problem and develop a low-complexity one-dimensional search algorithm, shedding light on a notable power allocation tradeoff between the S&C waveform. In the dual-functional waveform scheme, we conceive a heuristic mutual information optimization algorithm for the general case, alongside a modified gradient projection algorithm tailored for the scenarios with independent sensing sub-channels. Additionally, we identify the presence of both subspace tradeoff and water-filling tradeoff in this scheme. Finally, we validate the effectiveness of the proposed algorithms through numerical simulations. Copyright © 2023, The Authors. All rights reserved.

关键词： Optimization

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Generation of super-resolved optical needle and multifocal array using graphene oxide metalenses

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Opto-Electronic Advances 2021年第2期4卷 1-11页

作者： Hongtao Wang Chenglong Hao Han Lin Yongtian Wang Tian Lan Chengwei Qiu Baohua Jia Centre for Translational Atomaterials Faculty of ScienceEngineering and TechnologySwinburne University of TechnologyP.O.Box 218Hawthorn VIC 3122Australia Key Laboratory of Photoelectronic Imaging Technology and System Ministry of Education of ChinaSchool of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3Singapore 117583Singapore Engineering Product Development Pillar Singapore University of Technology and Design8 Somapah Road487372Singapore

Ultrathin flat metalenses have emerged as promising alternatives to conventional diffractive lenses,offering new possibilities for myriads of miniaturization and interfacial ***-based materials can achieve both phase and amplitude modulations simultaneously at a single position due to the modification of the complex refractive index and thickness by laser conversion from graphene oxide into graphene like *** this work,we develop graphene oxide metalenses to precisely control phase and amplitude modulations and to achieve a holistic and systematic lens design based on a graphene-based material *** experimentally validate our strategies via demonstrations of two graphene oxide metalenses:one with an ultra-long(~16λ)optical needle,and the other with axial multifocal spots,at the wavelength of 632.8 nm with a 200 nm thin *** proposed graphene oxide metalenses unfold unprecedented opportunities for accurately designing graphene-based ultrathin integratable devices for broad applications.

关键词： femtosecond laser reduction graphene oxide metalens multifocal spots optical needle

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Characterization of molten 2LiF–BeF_2 salt impregnated into graphite matrix of fuel elements for thorium molten salt reactor

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Nuclear science and Techniques 2019年第5期30卷 32-39页

作者： Hong-Xia Xu Jun Lin Ya-Juan Zhong Zhi-Yong Zhu Yu Chen Jian-Dang Liu Bang-Jiao Ye Center for Thorium Molten Salt Reactor System Shanghai Institute of Applied PhysicsChinese Academy of Sciences State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China USTC

The impregnation behavior of molten 2LiF–BeF_2(FLiBe) salt into a graphite matrix of fuel elements for a solid fuel thorium molten salt reactor(TMSR-SF) at pressures varying from 0.4 to 1.0 MPa was studied by mercury intrusion, molten salt impregnation, X-ray diffraction, and scanning electron microscopy *** was found that the entrance pore diameter of the graphite matrix is less than 1.0 μm and the contact angle is about 135°. The threshold impregnation pressure was found to be around 0.6 MPa experimentally, consistent with the predicted value of 0.57 MPa by the Washburn equation. With the increase of pressure from 0.6 to 1.0 MPa, the average weight gain of the matrix increased from 3.05 to 10.48%,corresponding to an impregnation volume increase from 2.74 to 9.40%. The diffraction patterns of FLiBe are found in matrices with high impregnation pressures(0.8 MPa and1.0 MPa). The FLiBe with sizes varying from tens of nanometers to a micrometer mainly occupies the open pores in the graphite matrix. The graphite matrix could inhibit the impregnation of the molten salt in the TMSR-SF with a maximum operation pressure of less than 0.5 MPa.

关键词： Keywords Molten salt reactor FLiBe Impregnation Graphite matrix

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Variable stiffness design optimization of fiber-reinforced composite laminates with regular and irregular holes considering fiber continuity for additive manufacturing

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Chinese Journal of Aeronautics 2025年第3期 338-358页

作者： Yi LIU Zunyi DUAN Chunping ZHOU Yuan SI Chenxi GUAN Yi XIONG Bin XU Jun YAN Jihong ZHU School of Mechanics Civil Engineering & ArchitectureNorthwestern Polytechnical University Research & Development Institute of Northwestern Polytechnical University in Shenzhen Key Lab for Airborne Hi-performance Electro-magnetic Window RISAC School of System Design and Intelligent Manufacturing Southern University of Science and Technology State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsInternational Research Center for Computational MechanicsDalian University of Technology State IJR Center of Aerospace Design and Additive Manufacturing MIIT Lab of Metal Additive Manufacturing and Innovative DesignNorthwestern Polytechnical University

Fiber-reinforced composites are an ideal material for the lightweight design of aerospace structures. Especially in recent years, with the rapid development of composite additive manufacturing technology, the design optimization of variable stiffness of fiber-reinforced composite laminates has attracted widespread attention from scholars and industry. In these aerospace composite structures, numerous cutout panels and shells serve as access points for maintaining electrical, fuel,and hydraulic systems. The traditional fiber-reinforced composite laminate subtractive drilling manufacturing inevitably faces the problems of interlayer delamination, fiber fracture, and burr of the laminate. Continuous fiber additive manufacturing technology offers the potential for integrated design optimization and manufacturing with high structural performance. Considering the integration of design and manufacturability in continuous fiber additive manufacturing, the paper proposes linear and nonlinear filtering strategies based on the Normal Distribution Fiber Optimization(NDFO) material interpolation scheme to overcome the challenge of discrete fiber optimization results, which are difficult to apply directly to continuous fiber additive manufacturing. With minimizing structural compliance as the objective function, the proposed approach provides a strategy to achieve continuity of discrete fiber paths in the variable stiffness design optimization of composite laminates with regular and irregular holes. In the variable stiffness design optimization model, the number of candidate fiber laying angles in the NDFO material interpolation scheme is considered as design variable. The sensitivity information of structural compliance with respect to the number of candidate fiber laying angles is obtained using the analytical sensitivity analysis method. Based on the proposed variable stiffness design optimization method for complex perforated composite laminates, the numerical examples consid

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Transcending the MAX phases concept of nanolaminated early transition metal carbides/nitrides – the ZIA phases

arXiv

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arXiv 2023年

作者： Tunes, M.A. Drewry, S.M. Schmidt, F. Valdez, J.A. Schneider, M.M. Kohnert, C.A. Saleh, T.A. Schön, C.G. Fensin, S. El-Atwani, O. Goossens, N. Huang, S. Vleugels, J. Maloy, S.A. Lambrinou, K. Materials Science and Technology Division Los Alamos National Laboratory United States Department of Materials Science and Engineering University of Tennessee United States Department of Nuclear Engineering University of California Berkeley United States Materials Physics and Applications Division Los Alamos National Laboratory United States Department of Metallurgical and Materials Engineering Universidade de São Paulo Brazil Reactor Materials and Mechanical Design Pacific Northwest National Laboratory United States Department of Materials Engineering KU Leuven Belgium School of Computing and Engineering University of Huddersfield United Kingdom

A new potential class of nanolaminated and structurally complex materials, herein conceived as the Zigzag IntermetAllic (ZIA) phases, is proposed. A study of the constituent phases of a specific Nb–Si–Ni intermetallic alloy revealed that its ternary H-phase, i.e., the Nb3SiNi2 intermetallic compound (IMC), is a crystalline solid with the close-packed fcc Bravais lattice, the 312 MAX phase stoichiometry and a layered atomic arrangement that may define an entire class of nanolaminated IMCs analogous to the nanolaminated ceramic compounds known today as the MAX phases. The electron microscopy investigation of the Nb3SiNi2 compound – the first candidate ZIA phase – revealed a remarkable structural complexity, as its ordered unit cell is made of 96 atoms. The ZIA phases extend the concept of nanolaminated crystalline solids well beyond the MAX phases family of early transition metal carbides/nitrides, most likely broadening the spectrum of achievable material properties into domains typically not covered by the MAX phases. Furthermore, this work uncovers that both families of nanolaminated crystalline solids, i.e., the herein introduced fcc ZIA phases and all known variants of the hcp MAX phases, obey the same overarching stoichiometric rule Px+yAxNy, where x and y are integers ranging from 1 to 6. © 2023, CC BY.

关键词： Electron microscopy

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