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arXiv 2024年

作者： Hou, Jinbo Qiu, Kehai Zhang, Zitian Yu, Yong Wang, Kezhi Capolongo, Stefano Zhang, Jiliang Li, Zeyang Zhang, Jie The Department of Electronic and Electrical Engineering the University of Sheffield Sheffield United Kingdom The Department of Computer Science and Technology University of Cambridge CambridgeCB3 0FD United Kingdom Brunel University London United Kingdom The School of Information and Electronic Engineering Zhejiang Gongshang University Hangzhou China The Design & Health Lab Department of Architecture Built Environment and Construction Engineering Politecnico di Milano Italy The Department of Computer Science Brunel University London Middlesex UxbridgeUB8 3PH United Kingdom The State Key Laboratory of Synthetical Automation for Process Industries The College of Information Science and Engineering Northeastern University Shenyang China The Centre for Wireless Innovation Queen’s University of Belfast BelfastBT3 9DT United Kingdom

This paper aims to simultaneously optimize indoor wireless and daylight performance by adjusting the positions of windows and the beam directions of window-deployed reconfigurable intelligent surfaces (RISs) for RIS-aided outdoor-to-indoor (O2I) networks utilizing large language models (LLM) as optimizers. Firstly, we illustrate the wireless and daylight system models of RIS-aided O2I networks and formulate a joint optimization problem to enhance both wireless traffic sum rate and daylight illumination performance. Then, we present a multi-modal LLM-based window optimization (LMWO) framework, accompanied by a prompt construction template to optimize the overall performance in a zero-shot fashion, functioning as both an architect and a wireless network planner. Finally, we analyze the optimization performance of the LMWO framework and the impact of the number of windows, room size, number of RIS units, and daylight factor. Numerical results demonstrate that our proposed LMWO framework can achieve outstanding optimization performance in terms of initial performance, convergence speed, final outcomes, and time complexity, compared with classic optimization methods. The building’s wireless performance can be significantly enhanced while ensuring indoor daylight performance. Copyright © 2024, The Authors. All rights reserved.

关键词： Daylighting

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Observation of Weyl point pair annihilation in a gyromagnetic photonic crystal

arXiv

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arXiv 2021年

作者： Liu, Gui-Geng Gao, Zhen Zhou, Peiheng Wang, Qiang Hu, Yuan-Hang Wang, Maoren Liu, Chengqi Lin, Xiao Yang, Shengyuan A. Yang, Yihao Chong, Yidong Zhang, Baile Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore637371 Singapore Department of Electrical and Electronic Engineering South University of Science and Technology Shenzhen518055 China National Engineering Research Center of Electromagnetic Radiation Control Materials Key Laboratory of Multi-spectral Absorbing Materials and Structures of Ministry of Education University of Electronic Science and Technology of China Chengdu610054 China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Science and Technology Innovation Center Zhejiang University Hangzhou310027 China Research Laboratory for Quantum Materials Singapore University of Technology and Design Singapore487372 Singapore Centre for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University 50 Nanyang Avenue Singapore639798 Singapore

Weyl semimetals are gapless three-dimensional (3D) phases whose bandstructures contain Weyl point (WP) degeneracies1. WPs carry topological charge and can only be eliminated by mutual annihilation, a process that generates the various topologically distinct 3D insulators1,2. Time reversal (T) symmetric Weyl phases, containing a minimum of four WPs, have been extensively studied in real materials3,4, photonic metamaterials5,6, and other systems. Weyl phases with a single WP pair – the simplest configuration of WPs – are more elusive as they require T-breaking7. Here, we implement a microwave-scale gyromagnetic 3D photonic crystal, and use field-mapping experiments to track a single pair of ideal WPs whose momentum space locations depend strongly on the biasing magnetic field. By continuously varying the field strength, we observe the annihilation of the WPs, and the formation of a 3D Chern insulator2,8,9, a previously unrealised member of the family of 3D topological insulators (TIs). Surface measurements show, in unprecedented detail, how the Fermi arc states connecting the WPs evolve into TI surface states. Copyright © 2021, The Authors. All rights reserved.

关键词： Photonic crystals

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Measurements of boiling heat transfer, time-averaged void fraction distributions using neutron radiography 18

Measurements of boiling heat transfer, time-averaged void fr...

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18th International Topical Meeting on Nuclear reactor Thermal Hydraulics, NURETH 2019

作者： Abir, Muhammad Khaykovich, Boris Petrik, Jan Kossolapov, Artyom Philips, Bren Bucci, Matteo Nuclear Reactor Laboratory Massachusetts Institute of Technology 77 Massachusetts Ave CambridgeMA02139 United States Department of Nuclear Science and Engineering Massachusetts Institute of Technology 77 Massachusetts Ave. CambridgeMA02139 United States

A key challenge for nuclear reactor thermal-hydraulics simulation tools is the prediction of void fraction distributions since they affect the reactor thermal margins (e.g., the departure from nucleate boiling ratio, DNBR), as well as the local reactivity (i.e., the reactor power distribution). To this end, these simulation tools have to be validated against high-resolution heat transfer and void fraction measurements. Accurate measurements of void fractions are not straightforward and are often constrained by invasive techniques. In this work, we explore the use of non-invasive neutron radiography to measure the void fraction distribution in subcooled boiling. The experiment is conducted at the MIT reactor (MITR) neutron beamline using a narrow rectangular cross-section pool mimicking the flow channel of experimental pool-type reactors. Instantaneous and time-averaged void fraction distributions are evaluated at two different heat fluxes, ambient pressure, and subcooling temperature. © 2019 American Nuclear Society. All rights reserved.

关键词： Void fraction

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Observation of spin-momentum-layer locking in centrosymmetric BiOI

arXiv

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arXiv 2020年

作者： Zhang, Ke Zhao, Shixuan Hao, Zhanyang Kumar, Shiv Schwier, Eike F. Zhang, Yingjie Sun, Hongyi Wang, Yuan Hao, Yujie Ma, Xiaoming Liu, Cai Wang, Xiaoxiao Miyamoto, Koji Okuda, Taichi Liu, Chang Mei, Jiawei Shimada, Kenya Chen, Chaoyu Liu, Qihang Department of Physical Science Graduate school of Science Hiroshima University Hiroshima Japan Shenzhen Institute for Quantum Science and Technology Department of Physics Southern University of Science and Technology Shenzhen China Hiroshima Synchrotron Radiation Center Hiroshima University Hiroshima Japan Guangdong Provincial Key Laboratory for Computational Science and Material Design Southern University of Science and Technology Shenzhen518055 China Shenzhen Key Laboratory of for Advanced Quantum Functional Materials and Devices Southern University of Science and Technology Shenzhen518055 China

Spin polarization effects in nonmagnetic materials are generally believed as an outcome of spin-orbit coupling provided that the global inversion symmetry is lacking, also known as "spin-momentum locking". The recently discovered hidden spin polarization indicates that specific atomic site asymmetry could also induce measurable spin polarization, leading to a paradigm shift to centrosymmetric crystals for potential spintronic applications. Here, combining spin- and angle-resolved photoemission spectroscopy and theoretical calculations, we report distinct spin-layer locking phenomena surrounding different high-symmetry momenta in a centrosymmetric, layered material BiOI. The measured spin is highly polarized along the Brillouin zone boundary, while is almost vanishing around the zone center due to its nonsymmorphic crystal structure. Our work not only demonstrates the existence of hidden spin polarization, but also uncovers the microscopic mechanism of the way spin, momentum and layer locking to each other, shedding lights on the design metrics for future spintronic devices. © 2020, CC BY.

关键词： Spin polarization

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Ferroelectric control of single-molecule magnetism in 2D limit

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science Bulletin 2020年第15期65卷 1252-1259,M0003页

作者： Xinwei Wang Chengcheng Xiao Chao Yang Miaogen Chen Shengyuan A.Yang Jun Hu Zhaohui Ren Hui Pan Wenguang Zhu Zhu-An Xu Yunhao Lu State Key Laboratory of Silicon Materials and School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China Departments of Materials and the Thomas Young Centre for Theory and Simulation of Materials Imperial College LondonLondon SW72AZUK Department of Physics China Jiliang University.Hangzhou 310018China Research Laboratory for Quantum Materials Singapore University of Technology and DesignSingapore 487372Singapore School of Physical Science and Technology Soochow UniversitySuzhou 215006China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacao SARChina ICQD Hefei National Laboratory for Physical Science at the MicroscaleKey Laboratory of Strongly-Coupled Quantum Matter PhysicsChinese Academy of SciencesDepartment of Physicsand Synergetic Innovation Center of Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefei 230026China Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310027China Collaborative Innovation Centre of Advanced Microstructures Nanjing UniversityNanjing 210093China

The electric control of magnetic properties based on magnetoelectric effect is crucial for the development of future data storage ***,based on first-principles calculations,a strong magnetoelectric effect is proposed to effectively switch on/off the magnetic states as well as alter the in-plane/perpendicular easy axes of metal-phthalocyanine molecules(MPc)by reversing the electric polarization of the underlying two-dimensional(2D)ferroelectric a-In2Se3 substrate with the application of an external electric *** mechanism originates from the different hybridization between the molecule and the ferroelectric substrate in which the different electronic states of surface Se layer play a dominant ***,the magnetic moments and magnetic anisotropy energies(MAE)of OsPc/In2Se3 can be further largely enhanced by a functionalized atom atop the OsPc *** I-OsPc/In2Se3 system possesses large MAE up to 30 meV at both polarization directions,which is sufficient for room-temperature *** findings provide a feasible scheme to realize ferroelectric control of magnetic states in 2D limit,which have great potential for applications in nanoscale electronics and spintronics.

关键词： Magnetoelectric effect Two-dimensional ferroelectric Single-molecular magnets In2Se3 Metal-phthalocyanine molecules

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Improving the mechanical properties and thermal conductivity of mesophase-pitch-based carbon fibers by controlling the temperature in industrial spinning equipment

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Carbon 2024年 226卷

作者： Gao-ming Ye Kui Shi Huang Wu Dong Huang Chong Ye Ting Ouyang Shi-peng Zhu Zhen Fan Hong-bo Liu Jin-shui Liu College of Materials Science and Engineering Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan University Changsha 410082 China Hunan Province Engineering Research Center for High Performance Pitch-based Carbon Materials Hunan Toyi Carbon Material Technology Co. Ltd. Changsha 410000 China State Key Laboratory of Advanced Design and Manufacturing for vehicle body Hunan University Changsha 410082 China Key Laboratory of Advanced Functional Composite Materials Aerospace Research Institute of Materials and Processing Technology Beijing 100076 China

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Exploring High Transition Temperature Superconductivity in a Freestanding or SrTiO3-Supported CoSb Monolayer

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Physical Review Letters 2020年第2期124卷 027002-027002页

作者： Wenjun Ding Jiang Zeng Wei Qin Ping Cui Zhenyu Zhang International Center for Quantum Design of Functional Materials (ICQD) Hefei National Laboratory for Physical Sciences at Microscale and Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China Key Laboratory of Strongly-Coupled Quantum Matter Physics Chinese Academy of Sciences School of Physical Sciences University of Science and Technology of China Hefei Anhui 230026 China

As a two-dimensional entity, FeSe has been widely explored to harbor high transition temperature (high-Tc) superconductivity in diverse physical settings; yet to date, the underlying superconducting mechanisms are still under active debate. Here we use first-principles approaches to identify a chemically different yet structurally identical counterpart of FeSe, namely, monolayered CoSb, which is shown to be an attractive candidate to harbor high-Tc superconductivity as well. We first show that a freestanding CoSb monolayer can adopt the FeSe-like layered structure, even though its known bulk phase has no resemblance to layering. Next, we demonstrate that such a CoSb monolayer possesses superconducting properties comparable with or superior to FeSe, a striking finding that can be attributed to the isovalency nature of the two systems. More importantly, the layered CoSb structure can be stabilized on SrTiO3(001), offering appealing alternative platforms for realizing high-Tc superconductivity beyond the well-established Cu- and Fe-based superconducting families. CoSb/SrTiO3(001) also exhibits distinctly different magnetic properties from FeSe/SrTiO3(001), which should provide a crucial new angle to elucidate the microscopic mechanisms of superconductivity in these and related systems.

关键词： First-principles calculations Superconducting phase transition 2-dimensional systems High-temperature superconductors Monolayer films Density functional theory Methods in superconductivity

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Hardness of Token Swapping on Trees

arXiv

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arXiv 2021年

作者： Aichholzer, Oswin Demaine, Erik D. Korman, Matias Lynch, Jayson Lubiw, Anna Masárová, Zuzana Rudoy, Mikhail Williams, Virginia Vassilevska Wein, Nicole University of Technology Graz Graz Austria Computer Science and Artificial Intelligence Laboratory Massachusetts Institute of Technology 32 Vassar St. CambridgeMA02139 United States Siemens Electronic Design Automation OR United States Cheriton School of Computer Science University of Waterloo WaterlooON Canada IST Austria Am Campus 1 Klosterneuburg3400 Austria LeapYear Technologies United States DIMACS Rutgers University United States

Given a graph where every vertex has exactly one labeled token, how can we most quickly execute a given permutation on the tokens? In (sequential) token swapping, the goal is to use the shortest possible sequence of swaps, each of which exchanges the tokens at the two endpoints of an edge of the graph. In parallel token swapping, the goal is to use the fewest rounds, each of which consists of one or more swaps on the edges of a matching. We prove that both of these problems remain NP-hard when the graph is restricted to be a tree. These token swapping problems have been studied by disparate groups of researchers in discrete mathematics, theoretical computer science, robot motion planning, game theory, and engineering. Previous work establishes NP-completeness on general graphs (for both problems), constant-factor approximation algorithms, and some poly-time exact algorithms for simple graph classes such as cliques, stars, paths, and cycles. Sequential and parallel token swapping on trees were first studied over thirty years ago (as "sorting with a transposition tree") and over twenty-five years ago (as "routing permutations via matchings"), yet their complexities were previously unknown. We also show limitations on approximation of sequential token swapping on trees: we identify a broad class of algorithms that encompass all three known polynomial-time algorithms that achieve the best known approximation factor (which is 2) and show that no such algorithm can achieve an approximation factor less than 2. Copyright © 2021, The Authors. All rights reserved.

关键词： Game theory

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Performance comparation of two kinds of aircraft ram air outlet

Performance comparation of two kinds of aircraft ram air out...

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CSAA/IET International Conference on Aircraft Utility Systems 2020, AUS 2020

作者： Zhimao, Li Xinlong, Zhu Boyu, Wu Houju, Pei Wenbing, Xu Hong, Shi Environment Control and Oxygen System Department Shanghai Aircraft Design and Research Institute Shanghai201210 China College of Energy and Power Jiangsu University of Science and Technology Zhenjiang212003 China Key Laboratory of Aircraft Environment Control and Life Support MIT Nanjing University of Aeronautics and Astronautics Nanjing210016 China

ISBN: (纸本)9781839535635

With the development of electronic equipment integration technology, the air demand for cooling in cabin and electronic system is increasing continuously. The ram air outlet plays an important role in the airflow system. In this paper, the three-dimensional modeling of the door-type ram air outlet and the grille-type ram air outlet is carried out. Then, the flow characteristics and resistance characteristics of ram air outlet are analyzed based on structured grid technology. The results show that the flow rate of the door panel ram air outlet is greater than that of the grille-type ram air outlet in the same size, the discharge rate of the door panel outlet is 0.3kg/s more than that of the grille-type outlet under the design condition, and the skin surface temperature at the back of the door panel outlet is 13.5K lower than that of the grille outlet. Therefore, the door-type ram air outlet has better emission characteristics and flow characteristics, which is more suitable for the aircraft in this research. This study provides a technical reference for the design of the civil aircraft. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Aircraft

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MOFs-based nanomaterials for bone repair and regeneration: Current status and future perspectives

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Chinese Chemical Letters 2025年

作者： Sida Huang Shihai Yin Aparna Kushwaha Abhinav Kumar Yu Deng Yanqiong Peng Ying Pan Jianqiang Liu Yong Huang Dongguan Key Laboratory of Drug Design and Formulation Technology School of Pharmacy Guangdong Medical University Dongguan 523808 China Hand Surgery Department Liaobu Hospital of Guangdong Medical University Dongguan 523000 China Department of Chemistry Faculty of Science University of Lucknow Lucknow 226007 India

Bone abnormalities induced due to inflammation, trauma, or diabetes have emerged as a serious issue during treatment and post-treatment. Currently, the prevalent treatments for bone abnormalities are surgery and antibiotics. However, they are progressively struggling to meet clinical needs. Metal-organic frameworks (MOFs) are acquiring attention among many bone repair and bone regeneration materials due to their excellent role in this area of research. MOFs -based nanomaterials are characterized by long-term stability, large specific surface area, and can be easily modifiable. Furthermore, their porous structure and increased mechanical capabilities are similar to alternative tissues, making them useful for bone repair and regeneration. This review article outlines the application of MOFs in bone repair and bone regeneration therapy. First, the mechanics of bone repair and regeneration are discussed, followed by a summary of the most frequent synthetic methods of MOFs for treating bone defects. Secondly, the strategies of different types of MOFs in bone repair and bone regeneration therapies are reviewed. Eventually, the challenges and future of MOFs in bone repairs and bone regeneration therapies are described, introducing a novel approach to treating bone abnormalities.

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