作者机构：
[Luo, Tan; Wang, Xin-Nian; He, Yayun] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Luo, Tan; Wang, Xin-Nian; He, Yayun] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Luo, Tan] Univ Santiago de Compostela, Inst Galego Fis Altas Enerxias IGFAE, E-15782 Santiago de Compostela, Galicia, Spain.;[He, Yayun] South China Normal Univ, Inst Quantum Matter, Guangdong Prov Key Lab Nucl Sci, Guangzhou 510006, Peoples R China.;[He, Yayun] South China Normal Univ, Southern Nucl Sci Comp Ctr, Guangdong Hong Kong Joint Lab Quantum Matter, Guangzhou 510006, Guangdong, Peoples R China.
通讯机构：
[Luo, T ] C;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Univ Santiago de Compostela, Inst Galego Fis Altas Enerxias IGFAE, E-15782 Santiago de Compostela, Galicia, Spain.
摘要：
A linear Boltzmann transport (LBT) Monte Carlo model has been developed to describe jet propagation and interaction with the quark -gluon plasma (QGP) in relativistic heavy -ion collisions. A complete set of elastic -scattering processes and medium -induced gluon emissions based on the higher -twist formalism are incorporated for both jet shower and medium recoil partons. It has been employed to describe experimental data on large transverse momentum hadron and jet spectra, correlation and jet substructures in high-energy heavy -ion collisions. We document in detail the structure of the model and validation of the Monte Carlo implementations of the physics processes in LBT, in particular, the inelastic process of medium -induced gluon radiation. We carry out a comprehensive examination of the jet -medium interaction as implemented in LBT through energy loss and momentum broadening of a single hard parton, the energy and transverse momentum transfer from leading partons to medium -induced gluons and jet -induced medium excitation, and medium modification of reconstructed jets in a static and uniform medium. With realistic and event -by -event hydrodynamic medium in heavy -ion collisions, we compute and compare with experimental data on the jet cone -size dependence of the single inclusive jet suppression at both the BNL Relativistic Heavy -Ion Collider (RHIC) and the CERN Large Hadron Collider (LHC), the dijet asymmetry at the LHC and gamma -jet correlation at RHIC. Effects of medium -induced gluon emissions and jet -induced medium excitation on jet observables are systematically examined. Rescatterings of the radiated gluons and recoil partons with the QGP are found essential to account for the enhancement of soft particle yield toward the edge of the jet cone.
期刊：
Journal of Statistical Mechanics: Theory and Experiment,2024年2024(2):023403 ISSN：1742-5468
通讯作者：
Marsili, M
作者机构：
[Xie, Rongrong] Cent China Normal Univ CCNU, Key Lab Quark & Lepton Phys MOE, Wuhan, Peoples R China.;[Xie, Rongrong] Cent China Normal Univ CCNU, Inst Particle Phys, Wuhan, Peoples R China.;[Marsili, Matteo; Marsili, M] Abdus Salam Int Ctr Theoret Phys, Quantitat Life Sci Sect, I-34151 Trieste, Italy.
通讯机构：
[Marsili, M ] A;Abdus Salam Int Ctr Theoret Phys, Quantitat Life Sci Sect, I-34151 Trieste, Italy.
关键词：
learning theory;machine learning
摘要：
We discuss the concept of probabilistic neural networks with a fixed internal representation being models for machine understanding. Here, 'understanding' is interpretted as the ability to map data to an already existing representation which encodes an a priori organisation of the feature space. We derive the internal representation by requiring that it satisfies the principles of maximal relevance and of maximal ignorance about how different features are combined. We show that, when hidden units are binary variables, these two principles identify a unique model-the hierarchical feature model-which is fully solvable and provides a natural interpretation in terms of features. We argue that learning machines with this architecture possess a number of interesting properties, such as the continuity of the representation with respect to changes in parameters and data, the possibility of controlling the level of compression and the ability to support functions that go beyond generalisation. We explore the behaviour of the model with extensive numerical experiments and argue that models in which the internal representation is fixed reproduce a learning modality which is qualitatively different from that of traditional models, such as restricted Boltzmann machines.
作者机构：
[Jia-Hao Wang] College of Science, China Three Gorges University, Yichang 443002, China;Center for Astronomy and Space Sciences and Institute of Modern Physics, China Three Gorges University, Yichang 443002, China;Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China;[Sheng-Qin Feng] College of Science, China Three Gorges University, Yichang 443002, China<&wdkj&>Center for Astronomy and Space Sciences and Institute of Modern Physics, China Three Gorges University, Yichang 443002, China<&wdkj&>Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China
通讯机构：
[Sheng-Qin Feng] C;College of Science, China Three Gorges University, Yichang 443002, China<&wdkj&>Center for Astronomy and Space Sciences and Institute of Modern Physics, China Three Gorges University, Yichang 443002, China<&wdkj&>Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China
摘要：
The impact of rotation on the deconfinement phase transition under the Einstein-Maxwell system of the soft and the hard wall models in holographic quantum chromodynamics is studied in this paper. The metric by cylindrical coordinates with rotation is introduced into the system to calculate the Hawking temperature. The first holographic study on the influence of the radius of a homogeneous rotating system on the phase diagram is proposed. It is found that the phase transition temperature hardly changes with the rotation angular velocity for a small rotation radius. Only with a larger rotation radius can the change in rotational angular velocity significantly alter the phase transition temperature. The phase transition temperature decreases rapidly with the increase of rotation angular velocity as the rotation radius increases.
作者机构：
[Zha, S; Zha, Shuai] Hubei Univ Chinese Med, Sch Lab Med, 16 Huangjia Lake West Rd, Wuhan 430065, Peoples R China.;[Zha, S; Zha, Shuai] Hubei Shizhen Lab, Wuhan 430061, Peoples R China.;[Jian, Yuehan; Pan, Siyu; Jiang, Lijun] Cent China Normal Univ, Sch Life Sci, Hubei Key Lab Genet Regulat & Integrat Biol, Wuhan 430079, Peoples R China.;[Peng, Yunhui] Cent China Normal Univ, Inst Biophys, Dept Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Zha, S ] H;[Jiang, LJ ] C;Hubei Univ Chinese Med, Sch Lab Med, 16 Huangjia Lake West Rd, Wuhan 430065, Peoples R China.;Hubei Shizhen Lab, Wuhan 430061, Peoples R China.;Cent China Normal Univ, Sch Life Sci, Hubei Key Lab Genet Regulat & Integrat Biol, Wuhan 430079, Peoples R China.
关键词：
Lanthanide nanosensor;Upconversion emission;NIR-II fluorescence;H 2 S detection;Endogenous H 2 S activated nanosensor
摘要：
Hydrogen sulfide (H2S), a third gas signaling molecule, is considered to play a vital role in the development and treatment of diseases. To elucidate the intricate role of H2S in the organism and its participation in disease processes, there is an urgent need to visualize the dynamics of H2S. However, most currently available molecular probes have limitations in terms of sensitivity, specificity, and precision. In this study, the safe and biocompatible upconversion nanosensor NaYF4:Yb3+, Tm3+@NaYF4 anchored with Ag2O was successfully fabricated for H2S detection with an ultralow detection limit at 0.93 ng/mL. NaYF4:Yb3+, Tm3+@NaYF4@Ag2S is formed through in situ sulfuration reaction, and second near-infrared (NIR-II) fluorescence can be recorded upon the presence of H2S under 808 nm excitation. The results demonstrate the exceptional detection linearity and high specificity for H2S quantification. Additionally, NaYF4:Yb3+, Tm3+@NaYF4@Ag2O possesses a safe nature in normal and cancer cells. This nanosensor presents a NIR fluorescence imaging strategy for highly sensitive and specific detection of H2S, which has promises to be a practical tool for biomedical applications.
期刊：
Microwave and Optical Technology Letters,2024年66(2):e34083- ISSN：0895-2477
通讯作者：
Yang, HL
作者机构：
[Yang, Helin; Fu, Yang; Yang, Haohui] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430000, Peoples R China.;[Ding, Fan] China Ship Dev & Design Ctr, Wuhan, Peoples R China.;[Chen, Shiju] Sci & Technol Complex Syst Control & Intelligent A, Beijing, Peoples R China.
通讯机构：
[Yang, HL ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430000, Peoples R China.
关键词：
chaff cloud;dipole cluster;electromagnetic scattering;radar cross section (RCS);the linear method of moment (LMM)
摘要：
This paper equates chaff clouds to dipole clusters and studies the electromagnetic scattering problem of dipole clusters based on the linear method of moment (LMM) that solve the electric field Integral equation with the pulse basis function. Firstly, the radar cross section (RCS) of three dipole elements is calculated. The dipole element is divided into 11 segment line units using pulse basis functions. The actual chaff clouds are modeled as two nearest dipole cluster models, which are cubic dipole cluster with uniform distribution formed and spherical dipole cluster with Gaussian distribution formed. The total RCS and total E-Field magnitude of two dipole cluster models were calculated. Finally, two physical models are constructed based on the simulation models and an experiment is designed. The electromagnetic scattering characteristics of the two models are measured, which verifies the accuracy of the simulation results and the operability of the experiment.
作者机构：
[Cheng, Houyuan; Dai, Yilin; Yang, Helin; Jin, Jing; Fu, Yang; Zhou, Xiaofeng] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Ding, Fan] China Ship Dev & Design Ctr, Wuhan 430064, Peoples R China.
通讯机构：
[Yang, HL ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
3-D structure;Frequency selective rasorber;Polarization insensitive;Switchable transmission band
摘要：
A novel polarization insensitive ultrawideband frequency selective rasorber (FSR) based on a 3-D cubic structure is proposed, and the fundamental operating principles of the three parts are demonstrated by equivalent circuit models. The first one is a 3-D FSR based on the multiple resonant absorptions of the curved longer dipole and shorter dipole excitation in the resonance chamber and the insertion of the interdigital resonator (IR) structure in the shorter dipole to form a transmission window. The passband with an insertion loss of less than 3 dB is 10.3-12.9 GHz (22.4%), and the frequency bandwidth with a reflection coefficient of less than -10 dB ranges from 4.2 to 20.5 GHz (132%). The second is a reconfigurable frequency selective surface (FSS) with two operating states, and the third is a 3-D FSR with a switchable passband feature that incorporates the above two structures of loaded switching diodes.
作者机构：
[Wu, Yanwen; Ge, Di] Cent China Normal Univ, Sch Phys Sci & Technol, 152 Luoyu Rd, Wuhan 430079, Peoples R China.;[Dong, Zheng] Beijing Bytedance Technol Co Ltd, 48 Zhichun Rd, Beijing 200000, Peoples R China.;[Cheng, Yuhang] SHAANXI GSXZ Technol Co Ltd, 57 Fengchan Rd, Xian 710061, Shaanxi, Peoples R China.;[Wu, Yanwen] Cent China Normal Univ, Natl Digital Learning Engn Technol Res Ctr, 152 Luoyu Rd, Wuhan 430079, Peoples R China.
通讯机构：
[Wu, YW ] C;Cent China Normal Univ, Sch Phys Sci & Technol, 152 Luoyu Rd, Wuhan 430079, Peoples R China.
关键词：
Multivariate time series;Spatio-temporal modeling;Graph contrastive learning;Unsupervised anomaly detection
摘要：
Anomaly detection using multivariate time series plays a crucial role in system security. Conventional deep learning detection techniques mainly depend on temporal dependency and employ reconstruction or prediction-based methods. However, as feature variables grow more intricate, there is a risk of neglecting essential spatio-temporal structural information, potentially leading to insufficient model training in unsupervised settings. Hence, we propose an end-to-end anomaly detection model with multiple pre-training tasks designed for the spatio-temporal dimension to enhance our constraints. Specifically, in the temporal dimension, we employ an autoregressive task to train timestamp associations using data’s concealed autocorrelation and periodicity. In the spatio dimension, we acquire knowledge of a diverse feature-related heterogeneous graph. Subsequently, we design three different graph contrastive learning tasks to tap into the effective information arising from the inherent heterogeneity and hierarchy in spatio structures. Through joint spatio-temporal modeling, we can effectively capture inter and intra-feature associations from series and graph structural features, enhancing model robustness to cope with the complex chain reactions between features. Finally, we assess our model on three real-world datasets: SWaT, WADI(2017, 2019), our F1 scores demonstrate enhancements of 6.17%, 18.3% and 5.35% over the top-tier baseline performance. Our model is applicable for both temporal and graph, is self-supervised learning for sparse data which is suitable for data sparsity and complex scenarios that need to capture spatio-temporal characteristics at the same time, for example, traffic flow detection and anomaly detection of intelligent systems. Further visualization experiments and case studies will provide a better interpretation of our model.
作者机构：
[Liu, Feng-Lei; Liu, FL; Qin, Guang-You; Wu, Xiang-Yu; Wang, Xin-Nian] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Liu, Feng-Lei; Liu, FL; Qin, Guang-You; Wu, Xiang-Yu; Wang, Xin-Nian] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;[Cao, Shanshan] Shandong Univ, Inst Frontier & Interdisciplinary Sci, Qingdao 266237, Shandong, Peoples R China.;[Wang, Xin-Nian] Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94720 USA.
通讯机构：
[Liu, FL ] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.
摘要：
In a quasi-particle model of QCD matter at finite temperature with thermal masses for quarks and gluons from hard thermal loops, the equation of state (EOS) can be described by an effective temperature dependence of the strong coupling g(T). Assuming the same effective coupling between the exchanged gluon and thermal partons, the EOS can also be related to parton energy loss. Based on the quasi-particle linear Boltzman n transport (QLBT) model coupled to a (3+1)-dimensional viscous hydrodynamic model of the quark-gluon plasma (QGP) evolution and a hybrid fragmentation-coalescence model for heav y quark hadronization, we perform a Bayesian analysis of the experimental data on D meson suppression R-AA and anisotropy v(2) at RHIC and the LHC. We achieve a simultaneous constraint on the QGP EOS and the heav y quark transport coefficient, both consistent with the lattice QCD results.
作者机构：
[Nayak, Kishora] Sambalpur Univ, Panchayat Coll, Dept Phys, Bargarh 768028, India.;[Shi, Shu-Su] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Shi, Shu-Su] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Lin, Zi-Wei] East Carolina Univ, Dept Phys, Greenville, NC 27858 USA.
通讯机构：
[Nayak, K ] S;Sambalpur Univ, Panchayat Coll, Dept Phys, Bargarh 768028, India.
关键词：
directed flow;coalescence sum rule
摘要：
Recently, the rapidity-odd directed flow (v1) of produced hadrons (K-, phi, p over bar , Lambda over bar , Xi over bar +, omega-, and omega over bar +) has been studied. Several combinations of these produced hadrons, with very small mass differences but differences in the net electric charge (Delta q) and net strangeness (Delta S) on the two sides, have been considered. A difference in v1 between the two sides of these combinations (Delta v1) has been proposed as a consequence of the electromagnetic field produced in relativistic heavy-ion collisions, especially if Delta v1 increases with Delta q. Our study is performed to understand the effect of the coalescence sum rule (CSR) on Delta v1. We point out that the CSR leads to Delta v1=cq Delta q+cS Delta S, where the coefficients cq and cS reflect the Delta v1 of produced quarks. Equivalently, one can write Delta v1=cq Delta q+cB Delta B, involving the difference in the net baryon number Delta B, where the CSR gives cB=-3cS. We then propose two methods to extract the coefficients for the Delta q and Delta S dependences of Delta v1.
摘要：
Spike-timing-dependent plasticity (STDP) is one of the important rules for the change of synaptic weights between neurons in biological nervous systems. In this paper, we study the effect of STDP on the synchronization phenomenon induced by time delay in the neuronal network which is the scale-free network with small-world property, and nodes of the network are constructed by Izhikevich neuron and connected by chemical synapses. For appropriate time delay values, there exists an optimal range of STDP maximum weight value in which the synchronization of the network is better, and in addition the synchronization is decreased with the increasing of STDP maximum weight value. The network with high synchronization has a centralized distribution of synaptic weights within it, while conversely, an unsynchronized network has a more discrete distribution of synaptic weights. When the STDP maximum weight value is too small, the collective firing pattern of network is not affected by synaptic current, and the synchronization of the network is also not affected. Interestingly, comparing with the small-world network and the scale-free network, it is found that a network has a smaller range of optimal STDP maximum weight values when the network is of larger average clustering coefficient, shorter average shortest path length, and higher small-world property. Our results can illuminate the potential significance of STDP for information processing and transmission in the nervous system.
通讯机构：
[Huang, GM ] C;Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
关键词：
scalar magnetometer;subsea power cables;attitude-independent detection;route tracking;high sea condition
摘要：
To overcome the shortcoming wherein the accuracy of subsea cable detection can be affected by the determination of the bias vector, scale factors, and non-orthogonality corrections of the vector magnetometer, a real-time attitude-independent route tracking method for subsea power cables is investigated theoretically and experimentally by means of scalar magnetic field checking. The measurement of the magnetic field B-c produced by the current in a cable is made immune to the influence of the platform attitude by extracting the component of B-c along the geomagnetic field using a high-bandwidth self-oscillating optically pumped magnetometer. The self-oscillating frequency is proved to be independent of the attitude of the magnetometer with the theoretical model. Experiments are carried out to test the attitude-independent performance, and the effectiveness of route tracking is verified by the results of the sea experiment. The proposed method will effectively improve the ability to locate subsea cables under high sea conditions.
作者机构：
[Kai Jin; Xu-Xing Geng; Jian-Feng Xiao; Zhi Liang; Wang-Wang Tang; Guang-Ming Huang; Gao-Xiang Li; Shao-Ping Wu] School of Physical Science and Technology, Central China Normal University, Wuhan, China;[Guo-Qing Yang; Shang-Qing Liang] School of Electronics and Information Engineering, Hangzhou Dianzi University, Hangzhou, China
摘要：
Self-oscillating magnetometers with high sensitivity are widely used in fields such as biomedicine and remote sensing. However, few studies comprehensively consider the effect of different parameters on their performance. We examined the effects of laser intensity, resonance detuning, radio frequency (RF) magnetic field, and atomic cell on the performance of portable self-oscillating magnetometers. To obtain the atomic absorption spectrum, we solved the system’s master equation in the multipole moment form. In theory, we analyse the influencing factors on the atomic magnetic resonance (AMR) signal. In the experiment, we artificially varied the relevant parameters to control the trends of changes in the atomic absorption spectra and evaluated their performance. The results are beneficial for optimizing the parameters of portable self-oscillating magnetometers with a laser pump-probe structure.
期刊：
Journal of Instrumentation,2024年19(03):C03031 ISSN：1748-0221
通讯作者：
Gao, C.;Zhang, D
作者机构：
[Yang, Y.] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China.;[Yang, Y.] Univ Chinese Acad Sci, Sch Nucl Sci & Technol, Beijing 100049, Peoples R China.;[Gao, C.; Liu, L.; Zhang, D; Gao, C; Wang, H.; Qiao, Y.; Zhang, D.; Huang, G.; Liang, T.; Chen, K.; Hu, Z.; Sun, X.; Liu, J.] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, PLAC, Wuhan 430079, Peoples R China.;[Tian, X.] Hubei Univ Sci & Technol, Sch Resources Environm Sci & Engn, Xianning 437100, Peoples R China.;[Song, Z.] Naval Univ Engn, Coll Elect Engn, Wuhan 430033, Peoples R China.
通讯机构：
[Zhang, D ; Gao, C] C;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, PLAC, Wuhan 430079, Peoples R China.
关键词：
Analogue electronic circuits;CMOS readout of gaseous detectors;Front-end electronics for detector readout
摘要：
This paper presents the design and electrical test results of a low-noise front-end chip (named Topmetal-S) in a High-pressure Time Projection Chamber (TPC) for searching the neutrinoless double beta decay. The Topmetal-S has been fabricated in a 130 nm CMOS technology. The proposed front-end chip consists of a charge collection electrode, a Charge Sensitive Amplifier (CSA) and peripheral circuits. The test results indicate that the CSA features an input linear dynamic range of approximately 6.64 fC, a charge-conversion gain of about 220 mV/fC and an Equivalent Noise Charge (ENC) of approximately 115e(-) after a digital trapezoidal pulse shaper.
期刊：
Monthly Notices of the Royal Astronomical Society,2024年530(2):1636-1643 ISSN：0035-8711
通讯作者：
Xia Zhou
作者机构：
Xinjiang Astronomical Observatory, Chinese Academy of Sciences , Urumqi 830011 , China;Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , Nanjing 210008 , China;Xinjiang Key Laboratory of Radio Astrophysics , Urumqi 830011 , China;Institute of Astrophysics, Central China Normal University , Wuhan 430079 , China;Department of Astronomy, School of Physics, Huazhong University of Science and Technology , Wuhan 430074 , China
通讯机构：
[Xia Zhou] X;Xinjiang Astronomical Observatory, Chinese Academy of Sciences , Urumqi 830011 , China<&wdkj&>Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , Nanjing 210008 , China<&wdkj&>Xinjiang Key Laboratory of Radio Astrophysics , Urumqi 830011 , China
关键词：
pulsars: general;pulsars: individual: PSR J0250+5854;pulsars: individual: PSR J2251−3711;pulsars: individual: PSR J0901−4046;stars: rotation
摘要：
This study investigates the influence of different braking mechanisms on the formation of three long-period radio pulsars (PSRs J0250+5854, J2251−3711, and J0901−4046): plasma-filled magnetosphere in combination with magnetic field decay, fall-back disc, and r-mode instability. These braking mechanisms can also affect the thermal evolution of pulsars. By comparing the model-predicted values with observational data such as spin periods, period derivatives, and upper limits of the bolometric luminosity of these pulsars, we find that these three braking mechanisms can reasonably explain the spin period and the period derivative within a certain range of parameters for these sources. The model-predicted bolometric luminosity associated with magnetic field dissipation exceeds the upper limit for PSR J0901−4046 but falls below the upper limits for PSR J0250+5854 and PSR J2251−3711. The model-predicted bolometric luminosity within the fall-back disc model exceeds the observed results, whereas the luminosity within the r-mode instability falls below the observed upper limit for these three pulsars. However, a conflict arises when we consider the pulsar radio activity and the accretion phases within the fall-back disc model simultaneously. By combining data from radio and X-ray observations, along with precise measurements of surface thermal emissions, we can enhance our understanding of the braking mechanisms involved in the formation of long-period radio pulsars or constrain key model parameters. Finding more long-period pulsars in the future and conducting multiband observations will enhance our understanding of the formation and nature of long-period radio pulsars.
作者机构：
[Chengdeng Gou; Xiangming Hu; Jun Xu] College of Physical Science and Technology, Central China Normal University, Wuhan 430079, People's Republic of China;[Fei Wang] School of Science, Hubei University of Technology, Wuhan 430068, People's Republic of China
摘要：
We show that the hybrid magnon-photon bundle emission is possible to generate by employing a three-level Δ -type superconducting artificial atom. The single atom is dispersively coupled with two microwave cavities, one of which simultaneously couples to a yttrium iron garnet (YIG) sphere via the magnetic dipole interaction. Based on the virtual photon exchange, the indirect magnon-atom interaction is established with flexibly tunable coupling strength, thus leading to the consecutive emission of hybrid magnon-photon pairs. The super-Rabi oscillation and Purcell effect make such a hybrid bundle possible in the present three-level system, which is difficult to achieve in the two-level system. The present scheme may find potential applications in quantum information processing and quantum sensing technology.
作者机构：
[Dengke Zhou; Jianhua Fang; Chenchen Miao; Huaxi Chen; Yi Feng; Jintao Xie; Xu Zhang; Chenwu Jin; Han Wang; Yinan Ke; Xuerong Guo] Research Center for Astronomical Computing, Zhejiang Laboratory, Hangzhou, China;[Mengyao Xue] National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China;Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, Beijing, China;University of Chinese Academy of Sciences, Beijing, China;New Cornerstone Science Laboratory, Shenzhen, China
通讯机构：
[Pei Wang; Di Li] N;National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China<&wdkj&>Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, Beijing, China<&wdkj&>National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China<&wdkj&>University of Chinese Academy of Sciences, Beijing, China<&wdkj&>New Cornerstone Science Laboratory, Shenzhen, China
摘要：
Globular clusters harbor numerous millisecond pulsars, but long-period pulsars (P ≳ 100 ms) are rarely found. In this study, we employed a fast folding algorithm to analyze observational data from multiple globular clusters obtained by the Five-hundred-meter Aperture Spherical radio Telescope (FAST), aiming to detect the existence of long-period pulsars. We estimated the impact of the median filtering algorithm in eliminating red noise on the minimum detectable flux density (Smin) of pulsars. Subsequently, we successfully discovered two isolated long-period pulsars in M15 with periods approximately equal to 1.928451 and 3.960716 s, respectively. On the
$$P - \dot P$$
diagram, both pulsars are positioned below the spin-up line, suggesting a possible history of partial recycling in X-ray binary systems disrupted by dynamical encounters later on. According to timing results, these two pulsars exhibit remarkably strong magnetic fields. If the magnetic fields were weakened during the accretion process, then a short duration of accretion might explain the strong magnetic fields of these pulsars.
通讯机构：
[Wang, SY ] S;[Tang, YW ] C;Shenzhen Polytech Univ, Coll Elect & Commun Engn, Shenzhen 518055, Peoples R China.;Cent China Normal Univ, Coll Phys & Technol, Dept Nanosci & Technol, Wuhan 430079, Peoples R China.
关键词：
Perovskite solar cells;Defect passivation;Surface induced secondary grain growth;Graded passivation
摘要：
Trap-mediated non-radiative loss is a major efficiency and stability obstale for solution-processed perovskite solar cells (PSCs). To address this issue, defect passivation using organic molecules has been identified as an effective strategy due to the ionic nature of the perovskite lattice. Herein, Ostwald ripening by using formamidine iodine (FAI) is reported to inhibit the carrier trap induced recombination via promoting secondary grain growth at perovskite surface. Based on secondary grain growth with FAI treatment, the graded passivation was presented caused by FA+ and I- from FAI. Moreover, the findings from time resolved photoluminescence and space charge-limited current technology indicate enhancements in the crystal quality. Consequently, this approach yielded a remarkable power conversion efficiency (PCE) of 20.62% for the FAI modified MAPbI3 photovoltaics, with significantly improved open-circuit voltage ratio of 3.10%, short-circuit density ratio of 6.11%, fill factor ratio of 9.46% and PCE ratio of 19.06%. Moreover, the device show the excellent stability. This study introduces simple and reproducible procedures for fabricating PSCs, which can be readily extended to diverse optoelectronic device applications.
