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11th IEEE International Conference on Teaching, Assessment and Learning for Engineering, TALE 2022

作者： Sucharitakul, Sukrit Pataranutapom, Pat Ngamkajomwiwat, Potiwat Chancharoen, Wares Mahapol, Thunyapong Dungsunenam, Nattanon Surareungchai, Werasak Puttaraksa, Nitipon Luksanayeam, Siwaphan Tantithakura, Opas Wonsawat, Kom Suathim, Prompt Sirisombat, Thakdanai Phongphisantham, Tanis Sankaew, Patcharapol Choowong, Sirion Chiang Mai University Faculty of Science Department of Physics and Materials Science Chiang Mai Thailand Massachusetts Institute of Technology MIT Media Lab Cambridge United States Panyapiway Insitute of Management Faculty of Engineering and Technology Nonthaburi Thailand Chulabhorn Royal Academy Princess Srisavangavadhana College of Medicine Bangkok Thailand Chulalongkorn University Faculty of Engineering Department of Aerospace Engineering Bangkok Thailand Spaceth.co Nonthaburi Thailand King Mongkuts University of Technology School of Bioresources and Technology Bangkok Thailand

ISBN: (纸本)9781665491174

One of the most crucial interdisciplinary fields in humanity's advancement is space education. As the field comprises of multiple fields of study combined together to form rocket science resulting in several new technology as outcomes. Thus, it is vital to raise awareness of younger generation to retain the field's integrity and inspire the younger generation to study science. However, as Thailand is developing country, the level of exposure of younger generation to space education is relatively low compared to those available in developed country. Therefore, this work presents a low-cost toolkit that would stimulate space education for younger generation in Thailand. An enrichment camp of 5 days was conducted to guide student through 4 learning parts;explore, experiment, embody and envision. Students of middle school age are challenged with relatively difficult concepts such as orbits, free falls, rotation and space exploration. Details of each steps and the learning method is discussed in the article. © 2022 IEEE.

关键词： Students

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Converse Barrier Certificates for Finite-time Safety Verification of Continuous-time Perturbed Deterministic Systems

arXiv

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arXiv 2024年

作者： Li, Yonghan Wu, Chenyu Wu, Taoran Wang, Shijie Xue, Bai State Key Lab. of Computer Science Institute of Software CAS Beijing China University of Chinese Academy of Sciences Beijing China School of Mathematics and Physics University of Science and Technology Beijing Beijing China

In this paper, we investigate the problem of verifying the finite-time safety of continuous-time perturbed deterministic systems represented by ordinary differential equations in the presence of measurable disturbances. Given a finite time horizon, if the system is safe, it, starting from a compact initial set, will remain within an open and bounded safe region throughout the specified time horizon, regardless of the disturbances. The main contribution of this work is to uncover that there exists a time-dependent barrier certificate if and only if the system is safe. This barrier certificate satisfies the following conditions: negativity over the initial set at the initial time instant, non-negativity over the boundary of the safe set, and non-increasing behavior along the system dynamics over the specified finite time horizon. The existence problem is explored using a Hamilton-Jacobi differential equation, which has a unique Lipschitz viscosity solution. Copyright © 2024, The Authors. All rights reserved.

关键词： Ordinary differential equations

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In-Plane Anomalous Hall Effect in PT-Symmetric Antiferromagnetic Materials

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Physical Review Letters 2023年第16期130卷 166702-166702页

作者： Jin Cao Wei Jiang Xiao-Ping Li Daifeng Tu Jiadong Zhou Jianhui Zhou 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 Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory HFIPS Anhui Chinese Academy of Sciences Hefei 230031 P. R. China Department of Physics University of Science and Technology of China Hefei 230026 P. R. China

The anomalous Hall effect (AHE), a protocol of various low-power dissipation quantum phenomena and a fundamental precursor of intriguing topological phases of matter, is usually observed in ferromagnetic materials with an orthogonal configuration between the electric field, magnetization, and the Hall current. Here, based on the symmetry analysis, we find an unconventional AHE induced by the in-plane magnetic field (IPAHE) via the spin-canting effect in PT-symmetric antiferromagnetic (AFM) systems, featuring a linear dependence of magnetic field and 2π angle periodicity with a comparable magnitude to conventional AHE. We demonstrate the key findings in the known AFM Dirac semimetal CuMnAs and a new kind of AFM heterodimensional VS2−VS superlattice with a nodal-line Fermi surface and, also, briefly discuss the experimental detection. Our Letter provides an efficient pathway for searching and/or designing realistic materials for a novel IPAHE that could greatly facilitate their application in AFM spintronic devices. National science Foundation

关键词： Antiferromagnetism Hall effect Transport phenomena First-principles calculations

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Changes in Water Use Efficiency Caused by Climate Change,CO_(2) Fertilization,and Land Use Changes on the Tibetan Plateau

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Advances in Atmospheric sciences 2023年第1期40卷 144-154页

作者： Binghao JIA Xin LUO Longhuan WANG Xin LAI State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD) Nanjing University of Information Science&TechnologyNanjing 210044China Key Lab of Virtual Geographic Environment(Nanjing Normal University) Ministry of EducationNanjing 210023China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023China Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu University of Information TechnologyChengdu 610225China

Terrestrial ecosystem water use efficiency(WUE)is an important indicator for coupling plant photosynthesis and transpiration,and is also a key factor linking the carbon and water cycles between the land and ***,under the combination of climate change and human intervention,the change in WUE is still unclear,especially on the Tibetan Plateau(TP).Therefore,satellite remote sensing data and process-based terrestrial biosphere models(TBMs)are used in this study to investigate the spatiotemporal variations of WUE over the TP from 2001 to ***,the effects of land use and land cover change(LULCC)and CO_(2) fertilization on WUE from 1981-2010 are assessed using *** show that climate change is the leading contributor to the change in WUE on the TP,and temperature is the most important *** makes a negative contribution to WUE(-20.63%),which is greater than the positive contribution of CO_(2) fertilization(11.65%).In addition,CO_(2) fertilization can effectively improve ecosystem resilience on the *** the northwest plateau,the effects of LULCC and CO_(2) fertilization on WUE are more pronounced during the driest years than the annual *** findings can help researchers understand the response of WUE to climate change and human activity and the coupling of the carbon and water cycles over the TP.

关键词： water use efficiency gross primary productivity evapotranspiration Tibetan Plateau carbon and water cycle

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The Realization of the Nanoscale Bar-Codes Based on CDS Branched Nanostructure

SSRN

引用

SSRN 2023年

作者： Guo, Shuai Wang, Xuefeng Zhao, Xiaoyu Weller, Dieter Wang, Yingying Jiang, Jie Liu, Ruibin School of Science Department of Optoelectronic Science Harbin Institute of Technology at Weihai Weihai264209 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing100081 China School of Marine Science and Technology Harbin Institute of Technology at Weihai Shandong Weihai264209 China University of Duisburg-Essen Duisburg47057 Germany

The nanostructures with controllable emission colors have shown great attention for achieving high throughput sensing, anti-counterfeiting, and information security. Here, a branched CdS nanostructure with Sn nanoparticles implanted in the junctions is proposed to construct lateral photonic barcodes in a two dimensional domain. Due to the encapsulated Sn nanoparticles, the plasmon enhanced photoluminescence is practically observed. However, with the generation of the high-energy electrons under illumination of the electron beam, the transfer process occurring between the CdS and Sn nanoparticles, result in cathodoluminescence quenching at the junctions. In addition, both temperature coefficients and Debye temperatures of the CdS branched nanostructures are determined to be 5.56×10-4 eV/K and 97 K, respectively, based on the temperature dependent photoluminescence spectrum. Also, the emission intensity of the band edge and the defect related emission can be well tuned by the excitation power. As the laser power increases, the emission color changes from red to the green. Therefore, the coding capacity of the CdS branched barcodes can be well modulated by the temperature and pump laser power. Our studies demonstrate the possibility of using these branched nanostructures in multifunctional optical devices. © 2023, The Authors. All rights reserved.

关键词： Cadmium sulfide

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Miscibility, Crystallization and Morphology in the Novel Polylactide/P(4-Hydroxybutyrate) Blends

SSRN

引用

SSRN 2024年

作者： Yang, Xiangyan Luo, Haoqi Zhou, Runyu Wei, Chuyue Deng, Jing Luo, Jiahui Yan, Xiaofei Yu, Kaiyuan Yuan, Shuaishuai Zhou, Weihua School of Physics and Materials Science Nanchang University Nanchang330031 China Key Lab of Biobased Polymer Materials Shandong Provincial Education Department College of Polymer Science and Engineering Qingdao University of Science and Technology Qingdao266042 China

The novel marine degradable poly(4-hydroxybutyrate) (P4HB) synthesized by chemical technique could obviously improve the brittleness of polylactide (PLLA) via physical blending. However, the miscibility, crystallization and morphology in PLLA/P4HB blends are still unexplored. In this article, the PLLA/P4HB blends with different weight ratios were prepared by the solution casting method, followed by the melting crystallization treatment. The PLLA and P4HB were demonstrated to be miscible near the melting temperature of PLLA as revealed by the Flory-Huggins interaction parameter calculating by melting point depression method. Anyway, PLLA and P4HB are supposed to be immiscible at room temperature according to the interfacial tension, fourier transform infrared spectroscopy (FTIR) analysis and scanning electron microscopy (SEM) observation. Both of PLLA and P4HB could form the highly crystalline crystals as casting from solution. The existence of P4HB could significantly induce the cold crystallization of PLLA on the second heating curves characterized by differential scanning calorimetry (DSC), showing of a sharp reduction in peak temperature of about 40 °C lower than that of pristine PLLA. The polarized optical microscopy (POM) and atomic force microscopy (AFM) observation revealed that the P4HB phase could penetrate into the region between fibrous crystals of PLLA spherulites during the isothermal crystallization at 130 °C, and the P4HB fragmented crystals will form after cooling to room temperature, leading to the formation of vertical phase separation in PLLA/P4HB blends associating with the surface tension data. The findings could provide theoretical guidance to understand the miscibility in PLLA based fully biodegradable blends, modulating the morphology and properties of the blends. © 2024, The Authors. All rights reserved.

关键词： Solubility

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Design monolayer iodinenes based on halogen bond and tiling theory

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Physical Review B 2024年第12期109卷 125423-125423页

作者： Kejun Yu Yichen Liu Botao Fu Run-Wu Zhang Da-shuai Ma Xiao-ping Li Zhi-Ming Yu Cheng-Cheng Liu 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 and Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing 100081 China College of Physics and Electronic Engineering Center for Computational Sciences Sichuan Normal University Chengdu 610068 China Institute for Structure and Function and Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics Chongqing University Chongqing 400044 People's Republic of China Center of Quantum Materials and Devices Chongqing University Chongqing 400044 People's Republic of China School of Physical Science and Technology Inner Mongolia University Hohhot 010021 China

Xenes, two-dimensional (2D) monolayers composed of a single element, with graphene as a typical representative, have attracted widespread attention. Most of the previous Xenes, X from group-IIIA to group-VIA elements, have bonding characteristics of covalent bonds. In this paper, we unveil the pivotal role of a halogen bond, which is a distinctive type of bonding with interaction strength between that of a covalent bond and a van der Waals interaction, in 2D group-VIIA monolayers. Combing the ingenious non-edge-to-edge tiling theory and state-of-the-art ab initio method with refined local density functional M06-L, we provide a precise and effective bottom-up construction of 2D iodine monolayer sheets, iodinenes, primarily governed by halogen bonds, and successfully design a category of stable iodinenes encompassing herringbone, Pythagorean, gyrated truncated hexagonal, i.e., diatomic kagome, and gyrated hexagonal tiling patterns. These iodinene structures exhibit a wealth of properties, such as nontrivial topology, flat bands and fascinating optical characteristics, offering valuable insights and guidance for future experimental investigations. Our paper not only unveils the unexplored halogen bonding mechanism in 2D materials but also opens an avenue for designing other noncovalent bonding 2D materials.

关键词： Electronic structure Structural properties Topological materials 2-dimensional systems Two-dimensional electron system Density functional theory

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Glasslike cross-plane thermal conductivity of the kagome metals RbV3Sb5 and CsV3Sb5

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Physical Review B 2023年第20期108卷 205112-205112页

作者： Yu Pang Jinjin Liu Xuanhui Fan Haobo Yang Jie Zhu Zhiwei Wang Yugui Yao Xin Qian Ronggui Yang School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Coal Combustion Huazhong University of Science and Technology Wuhan 430074 China 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 and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing 100081 China School of Energy and Power Engineering Dalian University of Technology Dalian 116024 China Material Science Center Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314011 China

In this paper, we report on the thermal conductivity of RbV3Sb5 and CsV3Sb5 with three-dimensional charge density wave phase transitions from 40 to 500 K measured by pump-probe thermoreflectance techniques. At room temperature, the in-plane (basal plane) thermal conductivities are found to be moderate, with 12Wm−1K−1 of RbV3Sb5 and 8.8Wm−1K−1 of CsV3Sb5, and ultralow cross-plane (stacking direction) thermal conductivities are observed, with 0.72Wm−1K−1 of RbV3Sb5 and 0.49Wm−1K−1 of CsV3Sb5. A unique glasslike temperature dependence in the cross-plane thermal conductivity is observed, which decreases monotonically even lower than the Cahill-Pohl limit as the temperature decreases below the phase transition point TCDW. This temperature dependence is found to obey the hopping transport picture. In addition, a peak in cross-plane thermal conductivity is observed at TCDW as a fingerprint of the modulated structural distortion along the stacking direction.

关键词： Charge density waves Hopping transport Phase transitions Thermal conductivity Kagome lattice Pump-probe spectroscopy

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Graphene-based optomechanically induced transparency for resonant excitation of a surface plasmon polariton

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Physical Review A 2024年第6期110卷 063508-063508页

作者： Akhtar Munir Ziauddin Shi-Hai Dong Chunfang Wang Department of Physics University of Shanghai for Science and Technology Shanghai 200093 China Quantum Optics Lab. Department of Physics COMSATS University Islamabad Islamabad Pakistan Research Center for Quantum Physics Huzhou University Huzhou 313000 China Centro de Investigación en Computación Instituto Politécnico Nacional UPALM CDMX 07738 Mexico

Cavity optomechanics, which focuses on the radiation-pressure interaction between electromagnetic fields and mechanical resonators, provides a suitable platform for exploring macroscopic quantum effects. Here, we propose an approach for coupler-free resonance excitation of surface plasmon polaritons (SPPs), which comprises a top vacuum or air layer, a metal film, and graphene placed on a dielectric slab. Unlike typical systems that employ an atomic or other solid medium, our setup takes advantage of the unique features of the graphene optomechanical (GOM) medium to investigate the direct resonance excitation of SPPs via optomechanical interactions. By employing two laser beams (a control beam and a probe beam) directed through air or vacuum to the top surface, we reveal that optomechanically induced transparency (OMIT) results from destructive interference between probe field and pump field-driven mechanical oscillations. We observe that this OMIT phenomenon possess the low-loss (high transmission) criterion in the region of slightly negative probe detuning, i.e., Re [ɛc]≪1 and Im [ɛc]<1, which is the basis for observing the coupler-free resonance excitation of SPPs. We utilize the transfer matrix approach to compute the reflectance and transmittance spectra, and we observe small dips in the reflectance and high sharp peaks in the transmittance spectra, revealing coupler-free resonance excitation of SPPs. The amplitudes of these sharp peaks in transmittance spectra showing resonance excitation of SPPs that can be enhanced by properly adjusting the control parameters, including, the control laser beam power, angle of incidence, and the thickness of the metal film. This approach has the potential to provide advantages such as tunable coupling and dynamic control of SPPs, paving the way for plasmonic devices with enhanced functionality and performance.

关键词： Optomechanics Plasmonics Quantum optics

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Nano-plasmonic graphene-quantum dots integrated photoelectronic biosensor

Nano-plasmonic graphene-quantum dots integrated photoelectro...

引用

OptoElectronics and Communications Conference, OECC

作者： Jiaxing Sun Lin Zhou Hongju Mao Jianlong Zhao Xianfeng Chen Department of Physics School of Science and Technology Nottingham Trent University Nottingham United Kingdom State Key Lab of Transducer Tech Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences China

We report a nano-plasmonic biosensor with integrated optoelectronic architecture developed on a miniaturized chip. With simple means, the nano-plasmonic sensor demonstrated the capability to record the selective and specific binding of proteins to the bioreceptors immobilized on gold nanoparticles arrays placed directly on a photoconductive graphene-Perovskite quantum dots hybrid channel. The distinct combination of the nano-plasmonic structure, proteins and hybrid two-dimensional materials endowed the photoelectronic detection of biotin with advantages of label-free, ultrahigh sensitivity and rapid speed.

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