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arXiv 2022年

作者： Zhang, J.-W. Zhang, Jian-Qi Ding, G.-Y. Li, J.-C. Bu, J.-T. Wang, B. Yan, L.-L. Su, S.-L. Chen, L. Nori, F. Özdemir, S.K. Zhou, F. Jing, H. Feng, M. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Innovation Academy of Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan430071 China Research Center for Quantum Precision Measurement Guangzhou Institute of Industry Technology Guangzhou511458 China School of Physics University of the Chinese Academy of Sciences Beijing100049 China School of Physics Zhengzhou University Zhengzhou450001 China Theoretical Quantum Physics Laboratory RIKEN Cluster for Pioneering Research Saitama 351-0198 Japan Physics Department The University of Michigan Ann ArborMI48109-1040 United States Department of Engineering Science and Mechanics Materials Research Institute Pennsylvania State University University Park State College PA16802 United States Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control Ministry of Education Department of Physics Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China Synergetic Innovation Academy for Quantum Science and Technology Zhengzhou University of Light Industry Zhengzhou450002 China

A quantum thermal machine is an open quantum system coupled to hot and cold thermal baths. Thus, its dynamics can be well understood using the concepts and tools from non-Hermitian quantum systems. A hallmark of non-Hermiticity is the existence of exceptional points where the eigenvalues of a non-Hermitian Hamiltonian or an Liouvillian superoperator and their associated eigenvectors coalesce. Here, we report the experimental realisation of a single-ion heat engine and demonstrate the effect of the Liouvillian exceptional points on the dynamics and the performance of a quantum heat engine. Our experiments have revealed that operating the engine in the exact- and broken-phases, separated by a Liouvillian exceptional point, respectively during the isochoric heating and cooling strokes of an Otto cycle produces more work and output power and achieves higher efficiency than executing the Otto cycle completely in the exact phase where the system has an oscillatory dynamics and higher coherence. This result opens interesting possibilities for the control of quantum heat engines and will be of interest to other research areas that are concerned with the role of coherence and exceptional points in quantum processes and in work extraction by thermal *** Codes 80A05, 37B55, 81P40 © 2022, CC BY.

关键词： Otto cycle

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A carbon [email protected] three-dimensional porous photo-supercapacitor for self-powered UV detection

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Materials Today Energy 2022年 28卷

作者： Yurong Wang Huanhuan Du Dongyang Xiao Yili Zhang Wei Wang Jing Zhang Xuhui Liu Jinyue Geng Fangjing Hu Leimeng Sun School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074 China MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics PGMF and School of Physics Huazhong University of Science and Technology Wuhan 430074 China School of Mechanical Engineering and Electronic Information China University of Geosciences (Wuhan) Wuhan 430074 China Beijing Institute of Control Engineering & Beijing Engineering Research Center of Efficient and Green Aerospace Propulsion Technology Beijing 100190 China

Miniaturized self-powered energy devices are indispensable units for next-generation portable electronics. Photo-supercapacitors (PSCs), as a reliable energy harvesting device, have been explored for self-powered applications by utilizing the photovoltaic effect of micro-supercapacitors. In this paper, we propose a self-powered PSC with bulk micro-machined three-dimensional (3D) porous asymmetric electrodes with a high-aspect ratio via deep reactive-ion etching (DRIE) technique for the detection of ultra-violet (UV) radiance. The as-fabricated porous [email protected] / [email protected] 2 PSC delivers an areal capacitance of 2.69 mF/cm 2 (@5 mV/s) and 7.35 mF/cm 2 (@20 μA/cm 2 ) before and after photo-charge process, respectively. The optical response of the PSC is linearly proportional to the UV power intensity with a photoresponsivity of 14.8 mA/W. A photocurrent density of 354 μA/cm 2 and a photo-to-dark current ratio of 12 are experimentally obtained under a UV power intensity of 15 mW/cm 2 . The as-prepared PSCs are further integrated on-chip to implement a UV leakage warning system that can drive a white LED for more than 60 s under a UV power intensity of 10 mW/cm 2 , fully demonstrating the practical application of the 3D silicon-based device in UV monitoring systems.

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Android Application and SMS Alert Based Garbage Monitoring and Navigation System

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Journal of Physics: Conference Series 2021年第6期1964卷

作者： K Umapathy T Mangayarkarasi D Subitha A Sivagami Department of Electronics and Communication Engineering Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya University (Deemed University) Kanchipuram Tamil Nadu India Department of Instrumentation and Control Engineering Sri Sairam Engineering College Chennai Tamil Nadu India Department of Electronics and Communication Engineering Vel Tech Rangarajan Dr.Sagunthala R&D Institute of Science and Technology Chennai Tamil Nadu India Department of Electronics and Communication Engineering Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Thandalam Chennai Tamil Nadu India

The treatment of waste is unsafe in city centres where residents are more involved, leading to germs that can lead to disease. How commonly these litter containers are used in different regions is different. Regular timing checks are not helpful. Often, they will overflow much faster than expected. In this article, a smart waste monitoring method is advised to prevent this and increase cleaning, to figure out where the waste is *** architecture of the method collects and transmits information through a wireless network. Under this technique, the dustbin's waste level is measured by sensors and information is transmitted through the GSM and GPS module to the official mobile station. Wi-Fi Module is used to track waste levels online at the control room. Arduino Processor uses network modules to link sensor systems.

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Core-shell [email protected] 2 O-graphene-polydopamine interdigitated microelectrode array sensor for in situ determination of salicylic acid in cucumber leaves

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Sensors and Actuators B: Chemical 2021年 341卷

作者： Dandan Liu Mingji Li Hongji Li Cuiping Li Guilian Wang Penghai Li Baohe Yang Tianjin Key Laboratory of Film Electronic and Communication Devices Engineering Research Center of Optoelectronic Devices & Communication Technology (Ministry of Education) School of Electrical and Electronic Engineering Tianjin University of Technology Tianjin 300384 PR China Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion Tianjin Key Laboratory of Drug Targeting and Bioimaging School of Chemistry and Chemical Engineering Tianjin University of Technology Tianjin 300384 PR China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin 300384 PR China

The in situ detection of active small molecules in plants is one of the key technologies for the development of precision agriculture. An interdigitated microelectrode (IDME) array electrochemical sensor is constructed herein, with three groups of IDME arrays as a three-electrode system. The core-shell [email protected] 2 O-graphene (Gr)-polydopamine (PDA) nanoparticles are densely packed on Al microelectrodes using a three-potential step pulse electrodeposition method. Each of the over 2000 individual microelectrodes is approximately 1 μm wide and 1100 μm in length. The sensor has a high response to salicylic acid (SA) due to the synergistic electrocatalysis of [email protected] 2 O, Gr, and PDA, and the high-density arrangement of the three-electrode unit with microelectrodes. The sensor has a linear concentration range of 0.01–100 μM for SA and the detection limit is as low as 1.16 nM. The SA concentration in cucumber leaves is monitored from the early growth stage to the fruiting stage using the IDME array sensor, and the juice and living stems of the cucumber are detected. The flat structure of the [email protected] 2 O-Gr-PDA IDME array sensor is suitable for attachment onto plant tissues, especially for the in situ detection of SA in leaves.

关键词： Core-shell [email protected] 2 O-graphene-polydopamine Interdigitated microelectrode array Sensor Salicylic acid Plant

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Master equations and quantum trajectories for squeezed wave packets

arXiv

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arXiv 2021年

作者： Gross, Jonathan A. Baragiola, Ben Stace, T.M. Combes, Joshua Center for Quantum Information and Control University of New Mexico AlbuquerqueNM87131-0001 United States Institut Quantique Université de Sherbrooke SherbrookeQCJ1K 2R1 Canada Centre for Quantum Computation & Communication Technology School of Science RMIT University MelbourneVIC3000 Australia ARC Centre for Engineered Quantum System Department of Physics University of Queensland BrisbaneQLD4072 Australia Department of Electrical Computer and Energy Engineering University of Colorado Boulder BoulderCO80309 United States

The interaction between matter and squeezed light has mostly been treated within the approximation that the field correlation time is small. Methods for treating squeezed light with more general correlations currently involve explicitly modeling the systems producing the light. We develop a general purpose input-output theory for a particular form of narrowband squeezed light-a squeezed wave-packet mode-that only cares about the statistics of the squeezed field and the shape of the wave packet. This formalism allows us to derive the input-output relations and the master equation. We also consider detecting the scattered field using photon counting and homodyne measurements which necessitates the derivation of the stochastic master equation. The non Markovian nature of the field manifests itself in the master equation as a coupled hierarchy of equations. We illustrate these with consequences for the decay and resonance fluorescence of two-level atoms in the presence of such fields. Copyright © 2021, The Authors. All rights reserved.

关键词： Wave packets

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Author Correction: Inferring time-varying generation time, serial interval, and incubation period distributions for COVID-19 ( doi 10.1038/s41467-022-35496-8, 13 dec 2022 )

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NATURE communicationS 2023年第1期14卷 1-1页

作者： Chen, Dongxuan Lau, Yiu-Chung Xu, Xiao-Ke Wang, Lin Du, Zhanwei Tsang, Tim K. Wu, Peng Lau, Eric H. Y. Wallinga, Jacco Cowling, Benjamin J. Ali, Sheikh Taslim WHO Collaborating Centre for Infectious Disease Epidemiology and Control School of Public Health Li Ka Shing Faculty of Medicine The University of Hong Kong Hong Kong Special Administrative Region China Laboratory of Data Discovery for Health Limited Hong Kong Science and Technology Park New Territories Hong Kong Special Administrative Region China College of Information and Communication Engineering Dalian Minzu University Dalian 116600 China Department of Genetics University of Cambridge Cambridge CB2 3EH UK Center for Infectious Disease Control National Institute for Public Health and the Environment (RIVM) Bilthoven The Netherlands Department of Biomedical Data Sciences Leiden University Medical Center Leiden The Netherlands

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An IoT Based Safe Assembly Point Alert System

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Journal of Physics: Conference Series 2021年第7期1964卷

作者： T Mangayarkarasi K Umapathy A Sivagami D Subitha Department of Instrumentation and Control Engineering Sri Sairam Engineering College Chennai Tamil Nadu India Department of Electronics and Communication Engineering Sri Chandrasekharendra Saraswathi Viswa Mahavidyalaya University (Deemed University) Kanchipuram Tamil Nadu India Department of Electronics and Communication Engineering Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Thandalam Chennai Tamil Nadu India Department of Electronics and Communication Engineering Vel Tech Rangarajan Dr.Sagunthala R&D Institute of Science and Technology Chennai Tamil Nadu India

A large population depends on many industries for its livelihood like electrical, embedded, software product sectors. An IoT environment includes feedback phones that use smart devices, such as MCU (microcontroller unit), sensors and different sensors, collect, distribute, and act on messages they collect from their environment. IoT systems share the sensory data they receive when data has been either sent to the cloud for global applications or analysis by linking to an IoT gateway or other edge device. For the electrical maintenance occur in the industries will need a specific alert signal. The loss of manufacturing workers/workers may be controlled by a specific, minor accident. Therefore, it is essential to provide an emergency device able to detect the non-safety state of coal and produce an alarm to reduce the possibility of risks in the system. We are proposing an IoT-based alert system via mobile phones, as smartphones' general usage is very common in the industries rather than using a walkie-talkie.

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Corrections to “Evaluations on AC Electrical Characteristics of No-Insulation Coil for Power Devices” [Jun 13 4700604]

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IEEE Transactions on Applied Superconductivity 2013年第5期23卷

作者： Young Jin Hwang Seungyong Hahn Sukjin Choi Hyun Chul Jo Yoon Hyuck Choi Tae Jung Kim Tae Kuk Ko School of Electrical and Electronic Engineering Yonsei University Seoul Korea Francis Bitter Magnet Laboratory Massachusetts Institute of Technology Cambridge MA USA Department of Materials Science and Engineering Korea University Seoul Korea Department of Electrical Power System Measurement and Control Korea Foundation of Polytechnic Colleges Seoul Korea

In the above titled paper (ibid., vol. 23, no. 3, p. 4700604, Jun. 2013), there are errors within some of the texts and figures. The author has corrected these here.

关键词： Superconducting coils Fault currents High-temperature superconductors Insulation Loss measurement Superconducting magnets

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Announcements, comments, and acknowledgments

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AIAA Journal 2006年第1期44卷 1-10页

作者： Oran, Elaine Kailasanath, Kazhikathra Aggarwal, Suresh K. Ahmadian, Mehdi Alexandrov, Natalia Auweter-Kurtz, Monika Bailly, Christophe Balachandran, Balakumar Berman, Alex Candler, Graham V. Chelliah, Harsha K. Chokani, Ndaona Fujii, Kozo Gaitonde, Datta V. Ghia, Kirti Karman N. Givi, Peyman Gore, Jay P. Kaplan, Carolyn R. Livne, Eli Lucht, Robert P. Messac, Achille Wing, N.G. Palazotto, Anthony N. Pierre, Christophe Plotkin, Allen Roy, Ajit K. Saigal, Sunil Sforza, Pasquale M. Shivakumar, Kunigal N. So, Ronald M.C. Springer, Anthony M. Anatolitumin, Anthony M. Zhong, Xiaolin United States Division of Computational Physics United States United States AIAA United States APS United States National Academy of Engineering United States Center for Reactive Flow and Dynamical Systems Naval Research Laboratory United States Institute of Physics Department of Mechanical Engineering University of Illinois at Chicago United States ASME Combustion Institute Department of Mechanical Engineering Virginia Polytechnic Institute State University United States Aeronautics Systems Analysis Branch NASA Langley Research Center United States SIAM ISSMO Aerospace Engineering Institute of Space Systems Universität Stuttgart Germany Amelia Earhart Italy International Amelia Earhart Award Committee Italy France France Mechanical Engineering University of Maryland College Park United States AAM SPIE ASA ASME Technical Committees of Multi-Body Systems Nonlinear Dynamics Dynamics and Control of Structures and Systems American Helicopter Society United States Aerospace Engineering and Mechanics University of Minnesota United States AIAA Thermophysics Technical Committee Mechanical and Aerospace Engineering University of Virginia United States AIAA Propellants and Combustion Technical Committee AIAA's Transition Study Group Aerodynamics Measurement Technology Technical Committee Thermophysics Technical Committee Japan MOSAIC project on the Technology Pressure-sensitive Paint Measurement System Japan High-Speed Flows Group Air Vehicles Directorate Air Force Research Laboratory Wright-Patterson Air Force Base United States Wright State University United States Aerospace Engineering and Engineering Mechanics United States United States Mechanical Engineering University of Pittsburgh United States School of Mechanical Engineering Purdue University United States Committee on Heat Transfer in Fire and Combustion Systems Japan Board of Advisors Central States Section Combustion Institute United States AIChE United States Tau Beta Pi United States

No abstract available

关键词： Institute of Space and Astronautical Science American Society of Mechanical Engineers Direct Numerical Simulation Aerospace engineering MDO Propellant Air Forces Aerodynamics Heterogeneous Combustion NASA Langley Research Center

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Origins of diamond surface noise probed by correlating single spin measurements with surface spectroscopy

arXiv

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arXiv 2018年

作者： Sangtawesin, Sorawis Dwyer, Bo L. Srinivasan, Srikanth Allred, James J. Rodgers, Lila V.H. de Greve, Kristiaan Stacey, Alastair Dontschuk, Nikolai O’Donnell, Kane M. Hu, Di Andrew Evans, D. Jaye, Cherno Fischer, Daniel A. Markham, Matthew L. Twitchen, Daniel J. Park, Hongkun Lukin, Mikhail D. de Leon, Nathalie P. Department of Electrical Engineering Princeton University PrincetonNJ08544 United States Department of Physics Harvard University CambridgeMA02138 United States Centre for Quantum Computation and Communication Technology School of Physics University of Melbourne ParkvilleVIC3010 Australia Department of Physics Astronomy and Medical Radiation Science Curtin University BentleyWA Australia Department of Physics Aberystwyth University AberystwythSY23 3BZ United Kingdom Material Measurement Laboratory National Institute of Standards and Technology GaithersburgMD20899 United States Element Six HarwellOX11 0QR United Kingdom Department of Chemistry and Chemical Biology Harvard University CambridgeMA02138 United States

The nitrogen vacancy (NV) center in diamond exhibits spin-dependent fluorescence and long spin coherence times under ambient conditions, enabling applications in quantum information processing and sensing 1, 2. NV centers near the surface can have strong interactions with external materials and spins, enabling new forms of nanoscale spectroscopy 3–6. However, NV spin coherence degrades within 100 nanometers of the surface, suggesting that diamond surfaces are plagued with ubiquitous defects 7–10. Prior work on characterizing near-surface noise has primarily relied on using NV centers themselves as probes 7–12;while this has the advantage of exquisite sensitivity, it provides only indirect information about the origin of the noise. Here we demonstrate that surface spectroscopy methods and single spin measurements can be used as complementary diagnostics to understand sources of noise. We find that surface morphology is crucial for realizing reproducible chemical termination, and use these insights to achieve a highly ordered, oxygen-terminated surface with suppressed noise. We observe NV centers within 10 nm of the surface with coherence times extended by an order of magnitude. Copyright © 2018, The Authors. All rights reserved.

关键词： Spectroscopic analysis

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