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45th EPS Conference on Plasma physics, EPS 2018

作者： Chai, Song Meng, Gang Wu, Runhui Liu, Jiaqi Liu, Xin Sun, Ruiqi Beijing Institute of Space Long March Vehicle National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing100076 China

ISBN: (纸本)9781510868441

Within this paper, a concept model containing main features of on-board magnetohydrodynamic (MHD) generators has been constructed and its feasibility of power extraction on supersonic vehicle for a typical flight condition has been studied numerically. The results revealed that the MHD generator is capable of providing substantial energy output up to tens of kilowatts per square meter or even several hundred kilowatts if the alkali-seeded boundary layer has been coated. © Copyright (2018) by European Physical Society (EPS) All rights reserved.

关键词： Magnetohydrodynamic converters

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Dual Ligand-Induced Photoelectrochemical Sensing by Integrating Pt/MoS2 Heterostructure and AU Polyhedra for Sensitive Detection of SARS-CoV-2

SSRN

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SSRN 2022年

作者： Li, Haolin Zhao, Jialin Wu, Ting Fu, Zhao Zhang, Wei Lian, Zheng Cai, Shuangfei Yang, Rong CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety Center of Materials Science and Optoelectronics Engineering CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology University of Chinese Academy of Sciences Beijing100190 China Sino-Danish College Sino-Danish Center for Education and Research University of Chinese Academy of Sciences Beijing100049 China Institute of Applied Physics and Computational Mathematics Beijing100088 China

The continuous evolution of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), with discovery of multiple mutants, has caused widespread panic and concern worldwide. The rapid antigen detection method via a single ligand recognition, although currently implemented in many countries, remains challenging for mutated antigens. Herein, we present a novel strategy using a dual recognition by two types of targeted ligands, based on photoelectrochemical (PEC) sensing for detection of SARS-CoV-2 spike protein. To demonstrate this strategy, the specific antibodies are modified onto the photoactive material with a supported nanostructure, created by loading the Pt nanoparticles onto MoS2 nanosheets (Pt/MoS2) to boost photon-to-electricity conversion efficiency. By subsequent binding of the targeted aptamers to the Au polyhedra, which act as a signal amplifier to suppress PEC photocurrent by competing with the Pt/MoS2 for the absorption of excitation light energy, the dual recognition is successfully achieved. The constructed biosensor not only shows satisfactory stability, and high sensitivity, but is effective for test of the pseudovirus of SARS-CoV-2. The work provides useful advance for the development of PEC biosensors for sensitive detection of SARS-CoV-2. © 2022, The Authors. All rights reserved.

关键词： Coronavirus

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The S-PLUS Ultra-Short Survey: Photometric Re-calibration with the BEst STar Database

arXiv

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arXiv 2025年

作者： Li, Xiaolu Xiao, Kai Huang, Yang Yuan, Haibo Tang, Yanke Beers, Timothy C. Huang, Bowen Ma, Mingyang Humire, Pedro K. Alvarez-Candal, Alvaro Sestito, Federico Gai, Ning Mao, Yongna Gu, Hongrui Tao, Zhenzhao Yang, Lin Xu, Shuai Hu, Rong College of Physics and Electronic information Dezhou University Dezhou253023 China International Centre of Supernovae Yunnan Key Laboratory Kunming650216 China School of Astronomy and Space Science University of Chinese Academy of Sciences Beijing100049 China Institute for Frontiers in Astronomy and Astrophysics Beijing Normal University Beijing102206 China CAS Key Lab of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences Beijing100012 China School of Physics and Astronomy Beijing Normal University No.19 Xinjiekouwai St Haidian District Beijing100875 China University of Notre Dame Notre DameIN46556 United States Departamento de Astronomia Instituto de Astronomia Geofísica e Ciências Atmosféricas da USP Cidade Universitária SP São Paulo05508-900 Brazil Instituto de Astrofísica de Andalucía CSIC Apt 3004 Granada18080 Spain Centre for Astrophysics Research Department of Physics Astronomy and Mathematics University of Hertfordshire HatfieldAL10 9AB United Kingdom College of Computer and Information Dezhou University Dezhou253023 China Institute for Astronomical Science Dezhou University Dezhou253023 China Department of Cyber Security Beijing Electronic Science and Technology Institute Beijing100070 China Department of Physics Beijing Technology and Business University Beijing100048 China

We present an independent validation and comprehensive re-calibration of S-PLUS Ultra-Short Survey (USS) DR1 12-band photometry using about 30,000–70,000 standard stars from the BEst STar (BEST) database. We identify spatial variation of zero-point offsets, up to 30–40 mmag for blue filters (u, J0378, J0395) and 10 mmag for others, predominantly due to the higher uncertainties of the technique employed in the original USS calibration. Moreover, we detect large- and medium-scale CCD position-dependent systematic errors, up to 50 mmag, primarily caused by different aperture and flat-field corrections. We then re-calibrate the USS DR1 photometry by correcting the systematic shifts for each tile using second-order two-dimensional polynomial fitting combined with a numerical stellar flat-field correction method. The re-calibrated results from the XPSP and the SCR standards are consistent within 6 mmag in the USS zero-points, demonstrating both the typical precision of re-calibrated USS photometry and a sixfold improvement in USS zero-point precision. Further validation using SDSS and Pan-STARRS1, as well as LAMOST DR10 and Gaia photometry, also confirms this precision for the re-calibrated USS photometry. Our results clearly demonstrate the capability and the efficiency of the BEST database in improving calibration precision to the milli-magnitude level for wide-field photometric surveys. The re-calibrated USS DR1 photometry is publicly available (doi: 10.12149/101503). Copyright © 2025, The Authors. All rights reserved.

关键词： Systematic errors

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Non-Markovian quantum dynamics: Extended correlated projection superoperators

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Physical Review E 2020年第3期102卷 032107-032107页

作者： Zhiqiang Huang (黄志强) State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Centre for Magnetic Resonance in Wuhan Wuhan Institute of Physics and Mathematics Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan 430071 People's Republic of China

The correlated projection superoperator techniques provide a better understanding about how correlations lead to strong non-Markovian effects in open quantum systems. Their superoperators are independent of initial state, which may not be suitable for some cases. To improve this, we develop another approach, that is extending the composite system before use the correlated projection superoperator techniques. Such an approach allows the choice of different superoperators for different initial states. We apply these techniques to a simple model to illustrate the general approach. The numerical simulations of the full Schrödinger equation of the model reveal the power and efficiency of the method.

关键词： Open quantum systems & decoherence Quantum discord Non-Markovian processes

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Influences of different definitions of the winter NAO index on NAO action centers and its relationship with SST

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Atmospheric and Oceanic science Letters 2019年第5期12卷 320-328页

作者： JING Yujie LI Yangchun XU Yongfu FAN Guangzhou School of Atmospheric Sciences ζhengdu University of Information TechnologyChengduChina State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and TechnologyQingdaoChina Department of Atmospheric Chemistry and Environmental Sciences College of Earth ScienceUniversity of Chinese Academy of SciencesBeijingChina

Winter North Atlantic Oscillation(NAO)indexes from observations based on various winter durations are *** show that there are significant differences in the interannual and decadal variations of these NAO *** the same data source,a different definition of winter duration can lead to different signs of NAO index in some years,which mainly appear to be in the period of decadal phase *** different winter durations induce different cycles of the observation-based *** longer the winter duration,the stronger the decadal *** NAO defined by different winter durations also can generate different descriptions of the NAO action centers,including the position and *** longer the winter duration,the more southerly action centers appear to *** movement of the action centers affects not only site-based NAO indexes but also those defined by other methods,such as empirical orthogonal function(EOF)*** length of time used in EOF analysis has a great influence on the spatial pattern of the NAO mode,which results in a considerable difference between the corresponding NAO *** of which NAO index is used,the NAO-related SST anomalies show the same tripole *** longer the winter duration,the more significant the relationship between the NAO and SST affected by the timescale of sea-air interaction.

关键词： NAO index winter duration period action centers sea surface temperature

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Dual-Polarized Filtering Antenna for Base Station Application

Dual-Polarized Filtering Antenna for Base Station Applicatio...

引用

International Conference on Microwave and Millimeter Wave technology Proceedings

作者： Chao Feng Ding Xiu Yin Zhang Zhi Jie Zhang Yun Fei Cao Lu Gao Jun Yang School of Electronic and Information Engineering South China University of Technology Guangzhou China The State Key Laboratory of Millimeter Waves Nanjing China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China

In this paper, a broadband dual-polarized filtering dipole is proposed for base station application. Filtering response is obtained by adding simple slits on each arm of the traditional dual polarized dipole antenna. Both lower and upper stopband radiation nulls are generated. The operating bandwidth of the proposed antenna is 1.7-2.9 GHz (52%). The out-of-band suppression level is about 10 dB within 0.69-1.5 GHz and 3.3-3.8 GHz. The simulated port isolation is more than 26 dB. The proposed antenna element is suitable for potential base station applications.

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No constraints for f(T) gravity from gravitational waves induced from primordial black hole fluctuations

arXiv

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arXiv 2022年

作者： Papanikolaou, Theodoros Tzerefos, Charalampos Basilakos, Spyros Saridakis, Emmanuel N. National Observatory of Athens Lofos Nymfon Athens11852 Greece Department of Physics National & Kapodistrian University of Athens Zografou Campus AthensGR 157 73 Greece Academy of Athens Research Center for Astronomy and Applied Mathematics Soranou Efesiou 4 Athens11527 Greece School of Sciences European University Cyprus Diogenes Street Engomi Nicosia1516 Cyprus CAS Key Laboratory for Researches in Galaxies and Cosmology Department of Astronomy University of Science and Technology of China Anhui Hefei230026 China School of Astronomy School of Physical Sciences University of Science and Technology of China Hefei230026 China

Primordial black hole (PBH) fluctuations can induce a stochastic gravitational wave background at second order, and since this procedure is sensitive to the underlying gravitational theory it can be used as a novel tool to test general relativity and extract constraints on possible modified gravity deviations. We apply this formalism in the framework of f(T) gravity, considering three viable mono-parametric models. In particular, we investigate the induced modifications at the level of the gravitational-wave source, which is encoded in terms of the power spectrum of the PBH gravitational potential, as well as at the level of their propagation, described in terms of the Green function which quantifies the propagator of the tensor perturbations. We find that, within the observationally allowed range of the f(T) model-parameters, the obtained deviations from general relativity, both at the levels of source and propagation, are practically negligible. Hence, we conclude that realistic and viable f(T) theories can safely pass the primordial black hole constraints, which may offer an additional argument in their favor. Copyright © 2022, The Authors. All rights reserved.

关键词： Gravity waves

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PolSAR Image Edge Detection via Structure Tensor Analysis

PolSAR Image Edge Detection via Structure Tensor Analysis

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IEEE International Geoscience and Remote Sensing Symposium

作者： Xiangrong Liu Wei Mao Shunsheng Zhang Lei Wu Wen-Qin Wang National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China Sch. of Info. Comm. Engin. University of Electronic Science and Technology of China Chengdu China

The weighted structure tensor (ST) can be usually used on edge detection of multi-channel images, including polarimetric synthetic aperture radar (polSAR) images. The traditional weighting method is average weighting, each channel considered to provide the same edge information. But in fact different channels tend to contain different amount of edge information, so the traditional weighting method cannot be adopted to extract full edge information of the multi-channel images. This letter proposes a novel weighting method for ST, in which the weight of each channel is obtained by the eigenvalue-measured way. Experimental results show that the proposed method outperforms the traditional method on edge detection.

关键词： Image edge detection Eigenvalues and eigenfunctions Estimation Optical imaging Hyperspectral imaging Corner detection

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Two-Dimensional Imaging With Stationary Nonuniform Frequency Diverse Array Transmitter

Two-Dimensional Imaging With Stationary Nonuniform Frequency...

引用

IEEE International Geoscience and Remote Sensing Symposium

作者： Xiangrong Liu Wei Mao Lei Wu National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China Sch. of Info. Comm. Engin. University of Electronic Science and Technology of China Chengdu China

This paper proposes a simple two-dimensional imaging via stationary nonuniform frequency diverse array (FDA) transmitter by exploiting FDA both range and angle dependent transmit beampattern. The nonuniform FDA transmitter only generates range-dependent beampattern, so that two-dimensional (range-angle dimension) imaging of targets can be achieved without the employment of moving radar platform, by jointly utilizing the only range-dependent transmitter beampattern and general single-antenna or phased-array antenna. The effectiveness of the proposed method is verified by simulation results.

关键词： Radar imaging Imaging Frequency diversity Radar antennas Transmitters Radar remote sensing

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Scalar induced gravitational waves in modified teleparallel gravity theories

arXiv

引用

arXiv 2023年

作者： Tzerefos, Charalampos Papanikolaou, Theodoros Saridakis, Emmanuel N. Basilakos, Spyros National Observatory of Athens Lofos Nymfon Athens11852 Greece Department of Physics National & Kapodistrian University of Athens Zografou Campus GR 157 73 Athens Greece CAS Key Laboratory for Researches in Galaxies and Cosmology Department of Astronomy University of Science and Technology of China Anhui Hefei230026 China Departamento de Matemáticas Universidad Católica del Norte Avda. Angamos 0610 Casilla Antofagasta1280 Chile Academy of Athens Research Center for Astronomy and Applied Mathematics Soranou Efesiou 4 Athens11527 Greece School of Sciences European University Cyprus Diogenes Street Engomi Nicosia1516 Cyprus

Primordial black holes (PBHs) forming out of the collapse of enhanced cosmological perturbations provide access to the early Universe through their associated observational signatures. In particular, enhanced cosmological perturbations collapsing to form PBHs are responsible for the generation of a stochastic gravitational-wave background (SGWB) induced by second-order gravitational interactions, usually called scalar induced gravitational waves (SIGWs). This SGWB is sensitive to the underlying gravitational theory;hence it can be used as a novel tool to test the standard paradigm of gravity and constrain possible deviations from general relativity. In this work, we study the aforementioned GW signal within modified teleparallel gravity theories, developing a formalism for the derivation of the GW spectral abundance within any form of gravitational action. At the end, working within viable f(T, φ) models without matter-gravity couplings, and accounting for the effect of mono-parametric f(T) gravity at the level of the source and the propagation of the tensor perturbations, we show that the respective GW signal is indistinguishable from that within GR. Interestingly, we find that in order to break the degeneracy between different f(T) theories through the portal of SIGWs one should necessarily consider non-minimal matter-gravity couplings at the level of the gravitational action. Copyright © 2023, The Authors. All rights reserved.

关键词： Gravity waves

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