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An ultra thin,bright,and sensitive interactive tactile display based on organic mechanoluminescence for dual-mode handwriting identification

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InfoMat 2024年第6期6卷 76-87页

作者： Tingting Hou Wenlang Li Haoyu Wang Yuantian Zheng Chaojie Chen Haoran Zhang Kai Chen Huilin Xie Xin Li Shaoshuai He Siwei Zhang Dengfeng Peng Cheng Yang Jacky W.Y.Lam Ben Zhong Tang Yunlong Zi Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong Kongthe People's Republic of China Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction and Institute for Advanced StudyThe Hong Kong University of Science and TechnologyHong Kongthe People's Republic of China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhenthe People's Republic of China Thrust of Sustainable Energy and Environment The Hong Kong University of Science and Technology(Guangzhou)Guangzhouthe People's Republic of China The Hong Kong University of Science and Technology Interdisciplinary Program Office Hong Kong SARthe People's Republic of China Institute of Materials Research Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhenthe People's Republic of China School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhenthe People's Republic of China HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute Shenzhenthe People's Republic of China Guangzhou HKUST Fok Ying Tung Research Institute Guangzhouthe People's Republic of China

Visible light-based human–machine interactive media is capable of transmitting electrical readouts to machines and providing intuitive feedback to users ***,many inorganic mechanoluminescent(ML)materials-based interactive media,typically ZnS-loaded phosphors(ZLPs),have been successfully ***,organic ML materials-based solutions were rarely exploited despite their huge merits of strong structural modification,abundant luminescence property,low cost,easy preparation,and so ***,we propose a novel interactive tactile display(ITD)based on organic ML materials(Cz-A6-dye)and triboelectric nanogenerator,with ultra-brightness(130%enhancement)and ultra-low threshold pressure(57%reduction)as compared to *** proposed ITD achieves the conversion of weak mechanical stimuli into visible light and electrical signals simultaneously,without extra power ***,the relationship between the luminous performance of organic ML materials and mechanical force is quantified,benefiting from the uniform ML layer *** by convolutional neural networks,the high-accuracy recognition(97.1%)for handwriting and identity of users is realized at the same ***,the ITD has great potential for intelligent wearable electronics and classified military applications.

关键词： interactive media organic mechanoluminescence triboelectric nanogenerators

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Energy calibration of GTM on ground

arXiv

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arXiv 2024年

作者： Huang, Chien-You Chang, Hsiang-Kuang Lin, Chih-Hsun Tsao, Che-Chih Hu, Chin-Ping Chang, Hao-Min Chen, Yan-Fu Feng, An-Hsuan Huang, Yi-Wen Lin, Tzu-Hsuan Tsao, Yi-Ning Wu, Chih-En Wu, Chun-Wei Department of Physics National Tsing Hua University Hsinchu300044 Taiwan Institute of Astronomy National Tsing Hua University Hsinchu300044 Taiwan Institute of Space Engineering National Tsing Hua University Hsinchu300044 Taiwan Institute of Physics Academia Sinica Taipei115201 Taiwan Department of Power Mechanical Engineering National Tsing Hua University Hsinchu300044 Taiwan Department of Physics National Changhua University of Education Changhua500207 Taiwan Arete Honors Program National Yang Ming Chiao Tung University Hsinchu300093 Taiwan

The Gamma-ray Transients Monitor (GTM) on board the Formosat-8B (FS-8B) satellite is designed to detect and localize Gamma-Ray Bursts (GRBs). By utilizing 2+2 CITIROC chips to manipulate 4+4 detectors, which are composed of GAGG(Ce) scintillators coupled with Silicon Photomultipliers (SiPMs) and oriented in various directions to achieve all-sky coverage, the GRB saturation fluences of GTM in the 50 keV to 1 MeV range for Short GRBs (SGRBs) and Long GRBs (LGRBs) were estimated to be about 3.1 × 10−4 and 5.0 × 10−3 erg/cm2, respectively, based on simulations. To precisely interpret the GTM readout signal in terms of energy, several measurements for isotope and gain calibration were conducted. Despite encountering issues with crosstalk and SiPM saturation effect in the data, the energy spectrum can still be recovered by appropriately discarding channel noise and mapping with the correct ADC-to-energy relation. This paper summarizes the energy resolution of GTM and the linear variations in the relationship between photon energy and readout signal. At 662 keV, the energy resolution is about 16 %. Also, it demonstrates that greater gain is achieved by increasing voltage or decreasing temperature. © 2024, CC BY.

关键词： Gamma rays

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Highly sensitive spin-flop transition in antiferromagnetic van der Waals material MPS3 (M=Ni and Mn)

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Physical Review Materials 2021年第6期5卷 064413-064413页

作者： Rabindra Basnet Aaron Wegner Krishna Pandey Stephen Storment Jin Hu Department of Physics University of Arkansas Fayetteville Arkansas 72701 USA Materials Science and Engineering Program Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA

Recent developments in two-dimensional (2D) magnetism have motivated the search for van der Waals (vdW) magnetic materials to explore magnetic phenomena in the 2D limit. Metal thiophosphates, MPX3, are a class of magnetic vdW materials with antiferromagnetic ordering persisting down to the atomically thin limit. The magnetism in this material family has been found to be highly dependent on the choice of transition metal M. In this work, we have synthesized the intermediate compounds Ni1−xMnxPS3 (0≤x≤1) and investigated their magnetic properties. Our study reveals that the variation of Ni and Mn content in Ni1−xMnxPS3 can efficiently tune the spin-flop transition, likely due to the modulation of the magnetic anisotropy. Such effective tuning offers a promising candidate to engineer 2D magnetism for future device applications.

关键词： Magnetic anisotropy Magnetic order

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Revising the quantum work fluctuation framework to encompass energy conservation

arXiv

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arXiv 2024年

作者： Rubino, Giulia Hovhannisyan, Karen V. Skrzypczyk, Paul Quantum Engineering Technology Labs H. H. Wills Physics Laboratory and Deparment and Electrical & Electronic Engineering University of Bristol BS8 1FD United Kingdom H. H. Wills Physics Laboratory University of Bristol Tyndall Avenue BristolBS8 1TL United Kingdom University of Potsdam Institute of Physics and Astronomy Karl-Liebknecht-Str. 24-25 Potsdam14476 Germany CIFAR Azrieli Global Scholars program CIFAR Toronto Canada

Work is a process-based quantity, and its measurement typically requires interaction with a measuring device multiple times. While classical systems allow for non-invasive and accurate measurements, quantum systems present unique challenges due to the influence of the measuring device on the final value of work. As recent studies have shown, among these challenges is the impossibility of formulating a universal definition of work that respects energy conservation for coherent quantum systems and is compatible with the Jarzynski equality—a fluctuation relation linking the equilibrium free energy difference to the non-equilibrium work. Here we overcome this challenge by introducing a genuinely quantum, positive correction to the Jarzynski equality stemming from imposing energy conservation. When sufficiently large, this correction forces quantum work to violate the second law more often. Moreover, we construct modified two-point measurement (TPM) schemes for work that ensure energy conservation for coherent quantum states and align with our quantum-corrected fluctuation relation. We further underscore the practicality and effectiveness of these schemes by providing detailed circuit implementations for them. Copyright © 2024, The Authors. All rights reserved.

关键词： Energy conservation

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Type-2 Fuzzy Sliding Mode Control Design for Self-Balancing Mobile Robot

Type-2 Fuzzy Sliding Mode Control Design for Self-Balancing ...

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International Conference on Information and Communications Technology (ICOIACT)

作者： Hartono Edi Leksono Endra Joelianto Instrumentation and Control Master Program Institut Teknologi Bandung Bandung Indonesia Engineering Physics Research Group Institut Teknologi Bandung Bandung Indonesia Instrumentation and Control Research Group Institut Teknologi Bandung Bandung Indonesia

Mobile robots have been a popular research topic in recent decades due to their many potential applications. One of the common types of mobile robots is the two-wheeled self-balancing robot, which operates based on the basic concept of an inverted pendulum. This concept represents an unstable system, so a proper controller is required to stabilize the system. This paper proposes a controller that combines a type2 fuzzy logic system and sliding mode control to stabilize and maintain the robot’s body balance in a straight upright position. Sliding mode control is a well-known robust controller with the ability to handle system disturbances. However, the presence of a switching law in sliding mode control can lead to the occurrence of chattering phenomena. Hence, a type-2 fuzzy logic system is applied to reduce the chattering effect by adjusting the switching gain of the sliding mode control. Additionally, the system’s stability is analyzed using the Lyapunov theorem. The simulation results demonstrate that the designed type-2 fuzzy sliding mode control not only reduces chattering but also decreases energy consumption by approximately 59.92% and reduces the undershoot of the pitching rate by about 33.5%, with only a 0.115-second longer settling time for pitching angle compared to conventional sliding mode control.

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Thermal simulation of microwave kiln based on multiphysics

Thermal simulation of microwave kiln based on multiphysics

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International Technical Conference o Circuits/Systems, Computers and Communications (ITC-CSCC)

作者： Thodsaphon Jansaengsuk Sorathon Pattanapichai Piyawong Poopanya Nonthawat Phimphakan Jatuporn Thongsri Computer Simulation in Engineering Research Group College of Advanced Manufacturing Innovation King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand Program of Physics Faculty of Science Ubon Ratchathani Rajabhat University Ubonratchatani Thailand

A microwave kiln, made of silicon carbide and ceramic fiber, commonly employs in a household glassware production process. In this process, when the kiln was in a microwave oven, a microwave transmitted to the kiln generating a high temperature to fuse the glass inside. This article presents a thermal simulation to investigate the temperature inside the kiln based on multiphysics consisting of a high-frequency structure simulator (HFSS) and computational fluid dynamics (CFD). The multiphysics results revealed the temperature inside the kiln in a transient state, consistent with the experimental results. As expected, the temperature increased with the increasing time of the process. Significantly, the silicon carbide had higher temperatures than the ceramic fiber; therefore, silicon carbide is a crucial material for generating heat inside the kiln. In addition, the temperature-increasing rate (TIR) inside the kiln depended on the kiln's thickness (Th). As a result, the thinner Th provided better TIR. The research findings can be applied to develop a high-efficacy household glassware production process.

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Back action in quantum electro-optic sampling of electromagnetic vacuum fluctuations

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Physical Review Research 2023年第1期5卷 013151-013151页

作者： T. L. M. Guedes I. Vakulchyk D. V. Seletskiy A. Leitenstorfer A. S. Moskalenko Guido Burkard Department of Physics and Center for Applied Photonics University of Konstanz D-78457 Konstanz Germany Center for Theoretical Physics of Complex Systems Institute for Basic Science (IBS) Daejeon 34126 Republic of Korea Basic Science Program Korea University of Science and Technology (UST) Daejeon Korea 34113 Republic of Korea Department of Engineering Physics Polytechnique Montréal Montréal QC Canada H3T 1J4 Department of Physics KAIST Daejeon 34141 Republic of Korea

The influence of measurement back action on electro-optic sampling of electromagnetic quantum fluctuations is investigated. Based on a cascaded treatment of the nonlinear interaction between a near-infrared coherent probe and the mid-infrared vacuum, we account for the generated electric-field contributions that lead to detectable back action. Specifically, we theoretically address two realistic setups, exploiting one or two probe beams for the nonlinear interaction with the quantum vacuum, respectively. The setup parameters at which back action starts to considerably contaminate the measured noise profiles are determined. We find that back action starts to detrimentally affect the signal once the fluctuations due to the coupling to the mid-infrared vacuum become comparable to the base shot noise. Due to the vacuum fluctuations entering at the beam splitter, the shot noise of two incoming probe pulses in different channels is uncorrelated. Therefore, even when the base shot noise dominates the output of the experiment, it does not contribute to the correlation signal itself. However, we find that further contributions due to nonlinear shot-noise enhancement are still present. Ultimately, a regime in which electro-optic sampling of quantum fields can be considered as effectively back-action free is found.

关键词： Nonlinear optical susceptibility Optical coherence Optical tests of quantum theory Quantum field theory (low energy) Quantum fluctuations & noise Quantum information processing Quantum measurements Quantum states of light Ultrafast optics

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Diffusion cascade in a model of interacting random walkers

arXiv

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arXiv 2024年

作者： Raj, Abhishek Glorioso, Paolo Gopalakrishnan, Sarang Oganesyan, Vadim Physics Program and Initiative for the Theoretical Sciences The Graduate Center CUNY New YorkNY10016 United States Department of Physics and Astronomy College of Staten Island CUNY Staten IslandNY10314 United States Zyphra Palo AltoCA94306 United States Department of Electrical and Computer Engineering Princeton University PrincetonNJ08544 United States

We consider the relaxation of finite-wavevector density waves in a facilitated classical lattice gas. Linear hydrodynamics predicts that such perturbations should relax exponentially, but nonlinear effects were predicted to cause subexponential relaxation via nonperturbative long-time tails [1]. We present a detailed numerical study of this effect. While our results clearly indicate the importance of nonlinear effects, we find that the wavevector-dependence of the late-time relaxation is clearly inconsistent with theoretical predictions. We discuss manifestations of hydrodynamic nonlinearities in mesoscopic samples and at short times. © 2024, CC BY.

关键词： Density of gases

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Graphene's photonic and optoelectronic properties——A review

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Chinese physics B 2020年第3期29卷 13-35页

作者： A J Wirth-Lima P P Alves-Sousa W Bezerra-Fraga Department of Physics Federal Institute of EducationScience and Technology of Ceara Campus SobralCearaBrazil Postgraduate Program in Electrical Engineering and Computing Federal University of Ceara(U.F.C.)Sobral CearaBrazil

Due to its remarkable electrical and optical properties,graphene continues to receive more and more attention from researchers around the *** excellent advantage of graphene is the possibility of controlling its charge density,and consequently,the management of its conductivity and dielectric constant,among other *** is noteworthy that the control of these properties enables the obtaining of new optical/electronic devices,which would not exist based on conventional ***,to work in this area of science,it is necessary to have a thorough knowledge regarding the electrical/optical properties of *** this review paper,we show these graphene properties very well detailed.

关键词： absorbance conductivity dielecric constant dispersion relation

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Spin-orbit-locked hyperbolic polariton vortices carrying reconfigurable topological charges

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eLight 2022年第1期2卷 143-153页

作者： Mingsong Wang Guangwei Hu Saroj Chand Michele Cotrufo Yohannes Abate Kenji Watanabe Takashi Taniguchi Gabriele Grosso Cheng‑Wei Qiu Andrea Alù Photonics Initiative Advanced Science Research CenterCity University of New YorkNew York CityNY 10031USA Department of Electrical and Computer Engineering National University of SingaporeSingapore 116083Singapore Department of Physics and Astronomy The University of GeorgiaAthensGA 30602USA Research Center for Functional Materials National Institute for Materials ScienceTsukubaIbaraki 305‑0044Japan International Center for Materials Nanoarchitectonics National Institute for Materials ScienceTsukubaIbaraki 305‑0044Japan Physics Program Graduate CenterCity University of New YorkNew YorkNY 10016USA

The topological features of optical vortices have been opening opportunities for free-space and on-chip photonic technologies,e.g.,for multiplexed optical communications and robust information *** a parallel but disjoint effort,polar anisotropic van der Waals nanomaterials supporting hyperbolic phonon polaritons(HP2s)have been leveraged to drastically boost light-matter *** far HP2 studies have been mainly focusing on the control of their amplitude and scale *** we report the generation and observation of mid-infrared hyperbolic polariton vortices(HP2Vs)associated with reconfigurable topological ***-shaped gold disks coated with a flake of hexagonal boron nitride are exploited to tailor spin-orbit interactions and realise deeply subwavelength *** complex interplay between excitation spin,spiral geometry and HP2 dispersion enables robust reconfigurability of the associated topological *** results reveal unique opportunities to extend the application of HP2s into topological photonics,quantum information processing by integrating these phenomena with single-photon emitters,robust on-chip optical applications,sensing and nanoparticle manipulation.

关键词： Hyperbolic polariton vortex Light-matter interactions Spin-orbit interaction Topological charge Reconfigurability

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