期刊：
OPTICS AND LASER TECHNOLOGY,2025年181:111582 ISSN：0030-3992
通讯作者：
Hai Lin
作者机构：
[Zihao Yu; Hai Lin; Rui Zhou] College of physical science and technology, Central China Normal University, Wuhan 430079, China;[Yiting Wang] Tobacco Hubei Industrial LLC, WUHAN Cigarette Factory, Wuhan 430000, China
通讯机构：
[Hai Lin] C;College of physical science and technology, Central China Normal University, Wuhan 430079, China
摘要：
Terahertz sensors with high sensitivity are essential for accurately detecting substances in various fields such as medical research, diagnostics, security, and molecular analysis. Their effectiveness relies on detecting small index changes that indicate a target, requiring resonance with an extremely high Q factor. Notably, taking advantage of topological corner states with narrow spectral widths and constant eigenfrequencies is a powerful strategy to attain high Q values. Combining the topological edge modes of valley twist states and high-order corner states, we have designed a topological sensor composed of a topological cavity and topological waveguide. The proposed sensor possesses an ultra-high Q value of up to 1.02×105. The exceedingly narrow linewidth of the topological cavity allows it to detect even the slightest changes in the spectrum, resulting in a high sensitivity of up to 2.06THz/RIU and a notable Figure of Merit (FoM) standing at 3.86×104. Moreover, the sensor is robust to structural disorder and defects inherent in fabrication processes, ensuring reliable performance in practical applications in different environments and manufacturing conditions.
期刊：
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences,2024年E107A(8):1364-1368 ISSN：0916-8508
通讯作者：
Xia, QQ
作者机构：
[Xia, Qiaoqiao; Wang, Ji; Jiang, Yun; Liu, Huiyang; Xia, QQ] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Jiao, Xiaopeng] Xidian Univ, Sch Comp Sci & Technol, Xian 710126, Peoples R China.
通讯机构：
[Xia, QQ ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
alternating direction method of multipliers (ADMM);low- density parity-check (LDPC) codes;check polytope projection;triangle projection algorithm
摘要：
In this letter, a novel projection algorithm is proposed in which projection onto a triangle consisting of the three even-vertices closest to the vector to be projected replaces check polytope projection, achieving the same FER performance as exact projection algorithm in both high- iteration and low-iteration regime. Simulation results show that compared with the sparse affine projection algorithm (SAPA), it can improve the FER performance by 0.2 dB as well as save average number of iterations by 4.3%.
摘要：
BACKGROUND: Deaths from COVID-19 are concentrated in older adults, and studies have reported that physical activity (PA) can reduce the risk of death from pneumonia. METHODS: Eight cohort studies and 2 case-control studies were included according to the inclusion and exclusion criteria established in this meta-analysis study followed the PRISMA guideline, 8 cohort studies and 2 case-control studies were finally included. Then, the research objects in these studies were classified to further study the dose-response relationship and non-dose-response relationship. RESULTS: The highest dose of PA reduced the risk of death by 59% (risk ratio = 0.41; 95% confidence interval: 0.23-0.58) compared with the lowest dose of PA in middle-aged and elderly people. Furthermore, when the PA level was <10 m/wk, the risk of death from pneumonia was reduced by 6% every 4.5 MET-h/wk increase. At a PA level > 10 m/wk, the risk of death from pneumonia increased by 5% every 4.5 MET-h/wk increase. At a PA level > 30 m/wk, PA is a risk factor for pneumonia-related death in middle-aged and elderly people. CONCLUSIONS: This meta-analysis showed that PA was associated with a reduced risk of dying from pneumonia in middle-aged and older adults, and that there was a significant nonlinear negative dose-response relationship between PA levels and the risk of dying from pneumonia. Therefore, moderate exercise was recommended.
摘要：
Calculating the thermal rate constants of elementary combustion reactions is of great importance in theoretical chemistry. Machine learning has become a powerful, data-driven method for predicting rate constants nowadays. Recently, the molecular similarity combined with the topological indices were proposed to represent the hydrogen abstraction reactions of alkane [J. Chem. Inf. Model. 2023, 63, 5097-5106], which are, however, not applicable to alkane cracking reactions, another important class of combustion reactions, due to the cleavage of the C-C bond. In this work, a new feature selection scheme is proposed to describe both bimolecular and unimolecular cracking reactions. Molecular descriptors are elaborately selected individually for both reactants and products from those generated by the open-source software RDKit. Machine learning models combined with these molecular descriptors are proven to have the ability to accurately predict rate constants of both the hydrogen abstraction reactions of alkanes by CH(3) and the alkane cracking reactions. The average deviation of the XGB-FNN model for prediction is around 60% for the hydrogen abstraction reactions of alkanes and 100% for the alkane cracking reactions. It is expected that the descriptors proposed in this work can be applied to build machine learning models for other reactions.
关键词：
Energy splitting of STAR-RIS;time switching of STAR-RIS;UAV-enabled outdoor-to-indoor WPCN;indoor NFZ
摘要：
This letter investigates a Simultaneously Transmitting and Reflecting Reconfigurable Intelligent Surface (STAR-RIS)-assisted unmanned aerial vehicle (UAV)-enabled outdoor-to-indoor (O2I) wireless powered communication network (WPCN), in which the UAV avoids flying over the indoor no-fly zone (NFZ). In the downlink energy transfer (DET) stage, the energy-constrained STAR-RIS and the O2I Internet of Things (IoT) devices harvest energy from the radio frequency (RF) signals of the UAV to self-sustain its operation. In the uplink information transmission (UIT) stage, the IoT devices transmit information to the UAV using the harvested energy, assisted by the STAR-RIS. We introduce the STAR-RIS energy splitting (ES) and time switching (TS) operating protocols in the DET and UIT stages, respectively, to maximize the harvested downlink energy and the achievable uplink sum-rate. Further, an alternating optimization (AO) algorithm based on the penalty method and successive convex approximation (SCA) technology is proposed to solve the resulting highly-coupled non-convex optimization problems, in which the UAV trajectory based on the UAV power consumption model, resource allocation of the O2I IoT devices, and beamforming vectors of the STAR-RIS are jointly optimized. Finally, numerical results demonstrate that our proposed scheme can achieve significant system sum-rate gains that are better than other baseline schemes.
作者机构：
[Yang, Xi-Yan] Yangtze Univ, Sch Phys & Optoelect Engn, Jingzhou 434023, Peoples R China.;[Lai, Xiao-Yu; Tan, Wei-Wei; Yang, Xi-Yan] Hubei Univ Educ, Res Ctr Astron, Wuhan 430205, Peoples R China.;[Tan, Wei-Wei] Cent China Normal Univ, Key Lab Quark & Lepton Phys, Minist Educ, Wuhan 430079, Peoples R China.;[Xu, Ren-Xin] Peking Univ, Sch Phys, Beijing 100871, Peoples R China.;[Xu, Ren-Xin] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China.
通讯机构：
[Lai, XY ] H;Hubei Univ Educ, Res Ctr Astron, Wuhan 430205, Peoples R China.
关键词：
dense matter;(stars:) pulsars: general;(stars:) gamma-ray burst: general
摘要：
Strangeon stars, which are proposed to describe the nature of pulsar-like compact stars, have passed various observational tests. The maximum mass of a non-rotating strangeon star could be high, which implies that the remnants of binary strangeon star mergers could even be long-lived massive strangeon stars. We study rigidly rotating strangeon stars in the slowly rotating approximation, using the Lennard-Jones model for the equation of state. Rotation can significantly increase the maximum mass of strangeon stars with unchanged baryon numbers, enlarging the mass-range of long-lived strangeon stars. During spin-down after merger, the decrease of radius of the remnant will lead to the release of gravitational energy. Taking into account the efficiency of converting the gravitational energy luminosity to the observed X-ray luminosity, we find that the gravitational energy could provide an alternative energy source for the plateau emission of X-ray afterglow. The fitting results of X-ray plateau emission of some short gamma-ray bursts suggest that the magnetic dipole field strength of the remnants can be much smaller than that of expected when the plateau emission is powered only by spin-down luminosity of magnetars.
摘要：
Currently, most fatigue driving detection methods rely on complex neural networks whose feasibility in hardware implementation needs to be further improved. This paper proposes an embedded device-oriented fatigue driving detection method based on a lightweight YOLOv5s. Firstly, a YOLOv5s face detection network with a parametric-free attention mechanism is designed to enhance the focus on face regions during face detection. Then, a practical facial landmark detector model is improved by integrating multi-scale feature fusion with Ghost module, which can adapt to the variations brought by different scale targets. Next, a fatigue determination approach is investigated by using multiple features of the face. Finally, experiments of the proposed detection model with the public YawDD dataset are implemented on the PC platform and the embedded device, respectively. The experimental results demonstrate that the proposed method achieves a detection accuracy of 95.3% and a processing speed of 22FPS on the PC platform. Meanwhile, the hardware test on an Orange Pi5 embedded device achieves a detection accuracy of 93.3% and a processing speed of 12FPS, which has good prospects for applications.
作者机构：
[Wang, Rigao; Shuang, Feng; Wang, RG; Shuang, F] Guangxi Univ, Sch Elect Engn, Nanning 530004, Peoples R China.;[Wang, Rigao; Shuang, Feng; Wang, RG; Shuang, F] Guangxi Univ, Guangxi Key Lab Intelligent Control & Maintenance, Nanning 530004, Peoples R China.;[Lu, Wanyu] China Tobacco Guangxi Ind Co Ltd, Nanning 530011, Peoples R China.;[She, Duan] Henan Acad Sci, Inst Phys, Zhengzhou 450046, Peoples R China.;[She, Duan] Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Peoples R China.
通讯机构：
[Wang, RG; Shuang, F ] G;Guangxi Univ, Sch Elect Engn, Nanning 530004, Peoples R China.;Guangxi Univ, Guangxi Key Lab Intelligent Control & Maintenance, Nanning 530004, Peoples R China.
关键词：
density functional theory (DFT);giant magnetoresistance (GMR);rectification ratio (RR);spin-filtering efficiencies (SFEs);zigzag graphene nanoribbons (ZGNRs)
摘要：
Employing the constructs of density functional theory (DFT) and the Nonequilibrium Green's Function (NEGF), the investigation extensively explores the electronic and transport properties of zigzag graphene nanoribbons (ZGNRs) doped with vanadium (V). Notably, this inquiry unveils that strategic doping can transform V-doped ZGNRs into spintronic nanodevices with distinctive transport attributes. Initially, the simulations showcase remarkably high spin-filtering efficiencies (SFEs) at certain bias voltages. Furthermore, a giant magnetoresistance (GMR) peaking at 6.87 x$\times$ 103$<^>3$ is detected. In conclusion, the examination discerns a spin rectifier that exhibits a significant rectification ratio (RR) of 9.62 x$\times$ 102$<^>2$. This research delineates a viable trajectory for the refinement of high-performance spintronics in ZGNRs via vanadium doping. The implications of this study indicate that the model harbors considerable promise for application in miniature spintronic devices. Four models of vanadium-doped zigzag graphene nanoribbons (ZGNRs) with different spacings of vanadium atoms: 2d$d$, d$d$, d/2$d/2$, and a zigzag pattern (ZZP) are explored. Only the d$d$-V-ZGNRs show metallic behavior for spin-up electrons. Using DFT and NEGF, it is found that high spin-filtering efficiencies, giant magnetoresistance, and significant spin rectification make these models promising for spintronic devices. image
摘要：
In this study, we compute the electromagnetic and hadronic decay widths of the S-wave fully heavy tetraquark T4Q (Q = c or b) at lowest order in alpha s and v, in the framework of nonrelativistic QCD. The short-distance coefficients are determined through the standard procedure of matching. The nonperturbative long-distance matrix elements are related to the phenomenological four-body Schrodinger wave functions at the origin, whose values are taken from literature. The branching fractions are predicted to be around 10-3 and 10-6 for the T4c hadronic decay and electromagnetic decay, respectively. Combining our results with the T4c production cross sections at the LHC, we also predict the event numbers for various decay channels. With integrated luminosity L = 100 fb-1, it is expected that the event numbers can reach 103-104 for T4c -> gamma gamma, and 105-106 for T4c -> LH, at the LHC. The detecting prospect is promising. In addition, the decay widths of T4b are estimated based on simple dimensional analysis as well as velocity scaling rule.
作者机构：
[Zhang, HZ; Xie, Man; Zhang, Han-Zhong; Wang, En-Ke; Zhang, Ben-Wei; Zhang, BW] South China Normal Univ, Guangdong Basic Res Ctr Excellence Struct & Fundam, Key Lab Atom & Subatom Struct & Quantum Control MO, Inst Quantum Matter, Guangzhou 510006, Peoples R China.;[Xie, Man; Wang, En-Ke] South China Normal Univ, Southern Nucl Sci Comp Ctr, Guangdong Hong Kong Joint Lab Quantum Matter, Guangdong Prov Key Lab Nucl Sci, Guangzhou 510006, Peoples R China.;[Zhang, HZ; Xie, Man; Zhang, Han-Zhong; Han, Qing-Fei; Wang, En-Ke; Zhang, Ben-Wei; Zhang, BW] Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Peoples R China.;[Zhang, HZ; Xie, Man; Zhang, Han-Zhong; Han, Qing-Fei; Wang, En-Ke; Zhang, Ben-Wei; Zhang, BW] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Zhang, HZ ; Xie, M; Wang, EK; Wang, EK ; Zhang, BW] S;[Han, QF] C;South China Normal Univ, Guangdong Basic Res Ctr Excellence Struct & Fundam, Key Lab Atom & Subatom Struct & Quantum Control MO, Inst Quantum Matter, Guangzhou 510006, Peoples R China.;South China Normal Univ, Southern Nucl Sci Comp Ctr, Guangdong Hong Kong Joint Lab Quantum Matter, Guangdong Prov Key Lab Nucl Sci, Guangzhou 510006, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Peoples R China.
关键词：
Jet quenching;Jet transport parameter;Hadron suppression;Elliptic flow coefficient;Energy loss asymmetry
摘要：
The medium-temperature T dependence of the jet transport coefficient q<^>\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\hat{q}$$\end{document} was studied via the nuclear modification factor RAA(pT)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$R_{AA}(p_\textrm{T})$$\end{document} and elliptical flow parameter v2(pT)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$v_2(p_\textrm{T})$$\end{document} for large transverse momentum pT\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$p_\textrm{T}$$\end{document} hadrons in high-energy nucleus-nucleus collisions. Within a next-to-leading-order perturbative QCD parton model for hard scatterings with modified fragmentation functions due to jet quenching controlled by q<^>\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\hat{q}$$\end{document}, we check the suppression and azimuthal anisotropy for large pT\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$p_\textrm{T}$$\end{document} hadrons, and extract q<^>\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\hat{q}$$\end{document} by global fits to RAA(pT)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$R_{AA}(p_\textrm{T})$$\end{document} and v2(pT)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$v_2(p_\textrm{T})$$\end{document} data in A + A collisions at RHIC and LHC, respectively. The numerical results from the best fits show that q<^>/T3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\hat{q}/T<^>3$$\end{document} goes down with local medium-temperature T in the parton jet trajectory. Compared with the case of a constant q<^>/T3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\hat{q}/T<^>3$$\end{document}, the going-down T dependence of q<^>/T3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\hat{q}/T<^>3$$\end{document} makes a hard parton jet to lose more energy near Tc\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$T_\textrm{c}$$\end{document} and therefore strengthens the azimuthal anisotropy for large pT\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$p_\textrm{T}$$\end{document} hadrons. As a result, v2(pT)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$v_2(p_\textrm{T})$$\end{document} for large pT\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$p_\textrm{T}$$\end{document} hadrons was enhanced by approximately 10% to better fit the data at RHIC/LHC. Considering the first-order phase transition from QGP to the hadron phase and the additional energy loss in the hadron phase, v2(pT)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$v_2(p_\textrm{T})$$\end{document} is again enhanced by 5-10% at RHIC/LHC.
摘要：
In this article, a water-based metasurface for antenna radar cross section (RCS) reduction is proposed for the first time. The metasurface has a two-layer structure of metal patch and structural water and achieves more than 9 dB RCS reduction in the super high-frequency (SHF) band from 10.6 to 26 GHz based on the mechanism of phase cancellation and wave absorption. Low scattering characteristics are achieved in the X-, Ku-, and K-bands. By using the metasurface as a radiator and introducing a feed structure, a low-scattering antenna in the C-band can be obtained. The impedance bandwidth of the antenna is from 5.7 to 6.07 GHz. The proposed antenna has an extremely small size and low profile, high aperture efficiency, and directional high gain radiation characteristics. Additionally, it exhibits low scattering across a broad frequency band. This work verifies the feasibility of water-based metasurfaces for antenna RCS reduction.
作者机构：
[Sheng, Xin-Li; Sheng, XL] INFN Firenze, Via Giovanni Sansone 1, I-50019 Sesto Fiorentino, FI, Italy.;[Sheng, Xin-Li] 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.;[Oliva, Lucia] Univ Catania, Dept Phys & Astron Ettore Majorana, Via S Sofia 64, I-95123 Catania, Italy.;[Oliva, Lucia] INFN, Sez Catania, Via S Sofia 64, I-95123 Catania, Italy.
通讯机构：
[Sheng, XL ] I;INFN Firenze, Via Giovanni Sansone 1, I-50019 Sesto Fiorentino, FI, Italy.
摘要：
We propose a relativistic theory for spin density matrices of vector mesons based on Kadanoff-Baym equations in the closed-time-path formalism. The theory puts the calculation of spin observables such as the spin density matrix element rho 00 for vector mesons on a solid ground. Within the theory we formulate rho 00 for phi mesons into a factorization form in separation of momentum and spacetime variables. We argue that the main contribution to rho 00 at lower energies should be from the phi fields that can polarize the strange quark and antiquark in the same way as electromagnetic fields. The key observation is that there is correlation inside the phi meson wave function between the phi field that polarizes the strange quark and that polarizes the strange antiquark. This is reflected by the fact that the contributions to rho 00 are all in squares of fields that are nonvanishing even if the fields may strongly fluctuate in spacetime. The fluctuation of strong force fields can be extracted from rho 00 of unflavored vector mesons as links to fundamental properties of quantum chromodynamics.
作者机构：
[Qin, Guang-You; Lu, Ye] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Qin, Guang-You; Lu, Ye] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Chen, Chang] Peking Univ, Dept Phys, Beijing 100871, Peoples R China.;[Zheng, Han-Qing] Sichuan Univ, Coll Phys, Chengdu 610065, Peoples R China.
通讯机构：
[Qin, GY ] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
关键词：
exotic hadrons;hadron molecule;X(6900)
摘要：
<jats:title>Abstract</jats:title>
<jats:p>The attractive interaction between <jats:inline-formula>
<jats:tex-math><?CDATA $ J/\psi $?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_48_4_041001_M4.jpg" xlink:type="simple" />
</jats:inline-formula> and <jats:inline-formula>
<jats:tex-math><?CDATA $ \psi(3770) $?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_48_4_041001_M5.jpg" xlink:type="simple" />
</jats:inline-formula> has to be strong enough if X(6900) is of the molecule type. We argue that since <jats:inline-formula>
<jats:tex-math><?CDATA $ \psi(3770) $?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_48_4_041001_M6.jpg" xlink:type="simple" />
</jats:inline-formula> decays predominantly into a <jats:inline-formula>
<jats:tex-math><?CDATA $ D\bar D $?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_48_4_041001_M7.jpg" xlink:type="simple" />
</jats:inline-formula> pair, the interactions between <jats:inline-formula>
<jats:tex-math><?CDATA $ J/\psi $?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_48_4_041001_M8.jpg" xlink:type="simple" />
</jats:inline-formula> and <jats:inline-formula>
<jats:tex-math><?CDATA $ \psi(3770) $?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_48_4_041001_M9.jpg" xlink:type="simple" />
</jats:inline-formula> may be significantly enhanced owing to the three point <jats:inline-formula>
<jats:tex-math><?CDATA $ D\bar D $?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_48_4_041001_M10.jpg" xlink:type="simple" />
</jats:inline-formula> loop diagram. The enhancement originates from the anomalous threshold located at <jats:inline-formula>
<jats:tex-math><?CDATA $ t=-1.288 $?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_48_4_041001_M11.jpg" xlink:type="simple" />
</jats:inline-formula> GeV<jats:inline-formula>
<jats:tex-math><?CDATA $ ^2 $?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_48_4_041001_M12.jpg" xlink:type="simple" />
</jats:inline-formula>, whose effect propagates into the <jats:italic>s</jats:italic>-channel partial wave amplitude in the vicinity of <jats:inline-formula>
<jats:tex-math><?CDATA $ \sqrt{s}\simeq 6.94 $?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_48_4_041001_M13.jpg" xlink:type="simple" />
</jats:inline-formula> GeV. This effect may be helpful in the formation of the <jats:inline-formula>
<jats:tex-math><?CDATA $ X(6900) $?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_48_4_041001_M14.jpg" xlink:type="simple" />
</jats:inline-formula> peak.</jats:p>
作者机构：
[Yi, Cong; Yi, C; Pu, Shi] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China.;[Wu, Xiang -Yu; Qin, Guang-You] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Wu, Xiang -Yu; Qin, Guang-You] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;[Yang, Di-Lun] Acad Sinica, Inst Phys, Taipei 11529, Taiwan.;[Gao, Jian-Hua] Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Envi, Weihai 264209, Shandong, Peoples R China.
通讯机构：
[Yi, C ] U;Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China.
摘要：
We investigate the azimuthal angle dependent local hydrodynamic helicity polarization of Λ hyperons, defined as the projection of the spin polarization vector along the directions of particle momenta, at BNL Relativistic Heavy Ion Collider beam energy scan energies by utilizing the relativistic ( 3+1 )D CLVisc hydrodynamics framework with SMASH initial conditions. As opposed to local spin polarization at high energy collisions, our hydrodynamic simulations demonstrate that the azimuthal angle dependent helicity polarization induced by the kinetic vorticity dominates over other contributions at intermediate and low collision energies. Our findings provide an opportunity to probe the fine structure of local kinetic vorticity as a function of azimuthal angle at intermediate and low collision energies by mapping our predictions to the future measurements in experiments.
期刊：
Journal of High Energy Physics,2024年(5) ISSN：1029-8479
通讯作者：
Chen, SL
作者机构：
[Xiao, Yu-Qi; Chen, Shao-Long] Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, 152 Luoyu Rd, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, 152 Luoyu Rd, Wuhan 430079, Peoples R China.
通讯机构：
[Chen, SL ] C;Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, 152 Luoyu Rd, Wuhan 430079, Peoples R China.
关键词：
Baryon/Lepton Number Violation;Other Weak Scale BSM Models;Specific BSM Phenomenology
摘要：
Neutrinoless double beta (0 nu beta beta) decay is the most promising way to determine whether neutrinos are Majorana particles. There are many experiments based on different isotopes searching for 0 nu beta beta decay. Combining the searches of 0 nu beta beta decay in multiple isotopes provides a possible method to distinguish operators and different models. The contributions to 0 nu beta beta decay come from standard, long-range, and short-range mechanisms. We analyze the scenario in which the standard and short-range operators exist simultaneously within the framework of low-energy effective field theory. Five specific models are considered, which can realize neutrino mass and can contribute to 0 nu beta beta decay via multiple mechanisms. A criterion to evaluate the possibilities of future experiments to discriminate operators and models is built. We find that the complementary searches for 0 nu beta beta decay in different isotopes can distinguish the cases that contain the low-energy effective operators O 1 , 2 , 5 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {\mathcal{O}}_{1,2,5} $$\end{document} and R-parity violating supersymmetry model. For other cases and models, the experimental searches within multiple isotopes can also more effectively constrain the parameter region than with only one isotope.
作者：
Ding, Qianming;Wu, Yong;Huang, Weifang;Jia, Ya
期刊：
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS,2024年:1-14 ISSN：1951-6355
通讯作者：
Jia, Y
作者机构：
[Wu, Yong; Huang, Weifang; Jia, Ya; Ding, Qianming] Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Jia, Y ] C;Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
摘要：
The mathematical optimization techniques may control the network to target firing patterns by adjusting the weights of network nodes. Inspired by the dynamics of dynamical learning, we recently proposed a technique for dynamic learning of synchronous (DLS) to control the firing state of neural networks. In this study, we apply the DLS technique to a Hodgkin-Huxley-style neural network, and investigate in regular, random, small-world and scale-free networks. We use the DLS technique to accomplish the network adaptive global synchronization, adaptive local synchronization, and phase locking with a single supervisory node. Furthermore, we investigated the robustness of the DLS technique in noisy environments and find that the DLS technique demonstrates remarkable effectiveness even in the presence of weak noise. However, in scenarios with stronger noise, there is a trade-off between optimizing training and avoiding overfitting, i.e., a too narrow weight adjustment range may hinder training effectiveness, while an excessively wide range results in abnormal node firing dynamics. We expect the DLS technique to be potentially valuable for more studies of nonlinear systems.
摘要：
Dynamical rewiring widely exists in complex systems, however the impact of dynamical rewiring in the synchronization of neural systems is currently unknown. In this paper, we use memristive FitzHugh-Nagumo neurons to construct random, small-world and scale-free networks in which the connections between neurons can be rewired, and investigate the influence of rewiring on the synchronization of neural networks in with/without Gaussian white noise, and comparing it to the corresponding static networks. We found that dynamical rewiring enhances the synchronization of the network, and the degree of synchronization will be higher when the rewiring period is shorter and the rewiring proportion is larger. In addition, the synchronization of the network gradually diminishes as the coupling strength decreases and the noise intensity increases, and rewiring networks always exhibit superior synchronization to static networks since the dynamical rewiring enhances the interaction between neurons. Our study shows that neural network models with dynamically changing topology are more suitable and realistic network models, which may reveal the profound significance of dynamic rewiring for the multifaceted dynamic flexibility and adaptability of neural systems.
