期刊:
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS,2024年:1-14 ISSN:1951-6355
通讯作者:
Ya Jia
作者机构:
[Qianming Ding; Yong Wu; Weifang Huang; Ya Jia] Department of Physics, Central China Normal University, Wuhan, China
通讯机构:
[Ya Jia] D;Department of Physics, Central China Normal University, Wuhan, 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:
The observational data (e.g., the timing data and magnetic tilt angles chi) of young pulsars can be used to probe some critical issues about the internal physics of neutron stars (NSs), for instance, the number of precession cycles xi and the internal magnetic field configuration (IMFC) of NSs. Evolution of the dipole magnetic field B-d of NSs may play an important role in determining the final results. In this work, a power-law form is adopted to describe the decay of B-d. In such a scenario, the IMFC and xi of young pulsars with an ordinary B-d similar to 1012-1013 G and a steady braking index n are investigated. Since the tilt angle change rates chi(center dot) of pulsars with n < 3 can be theoretically predicted, a test on the power-law decay model can thus be made by comparing the theoretical values to that obtained from observations. However, such a comparison can only be made on the Crab pulsar currently, and the results show that the power-law decay model is inconsistent with the Crab's observations. We suggest that rather than decay, the Crab's B-d should increase with time at a rate similar to 12-14 G/s. A definite conclusion on the validity of the power-law decay model for pulsars with ordinary B-d may be given if chi(center dot) of other pulsars could be measured.
期刊:
Machine Learning: Science and Technology,2024年5(1) ISSN:2632-2153
通讯作者:
Li, W
作者机构:
[Liu, Feiyi; Li, W; Wang, Yanyang; Li, Wei; Shen, Jianmin] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Liu, Feiyi; Li, W; Wang, Yanyang; Li, Wei; Shen, Jianmin] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Liu, Feiyi] Eotvos Lorand Univ, Inst Phys, 1-A Pazmany P Setany, H-1117 Budapest, Hungary.;[Shen, Jianmin] Baoshan Univ, Coll Engn & Technol, Baoshan, Peoples R China.
通讯机构:
[Li, W ] 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.
关键词:
machine learning;non-equilibrium phase transitions;branching annihilating random walks;convolutional neural networks;autoencoder
摘要:
Machine learning (ML) of phase transitions (PTs) has gradually become an effective approach that enables us to explore the nature of various PTs more promptly in equilibrium and nonequilibrium systems. Unlike equilibrium systems, non-equilibrium systems display more complicated and diverse features because of the extra dimension of time, which is not readily tractable, both theoretically and numerically. The combination of ML and most renowned nonequilibrium model, directed percolation (DP), led to some significant findings. In this study, ML is applied to (1+1)-d, even offspring branching annihilating random walks (BAW), whose universality class is not DP-like. The supervised learning of (1+1)-d BAW via convolutional neural networks (CNN) results in a more accurate prediction of the critical point than the Monte Carlo (MC) simulation for the same system sizes. The dynamic exponent z and spatial correlation length correlation exponent nu(perpendicular to) were also measured and found to be consistent with their respective theoretical values. Furthermore, the unsupervised learning of (1+1)-d BAW via an autoencoder (AE) gives rise to a transition point, which is the same as the critical point. The latent layer of AE, through a single neuron, can be regarded as the order parameter of the system being properly re-scaled. Therefore, we believe that ML has exciting application prospects in reaction-diffusion systems such as BAW and DP.
期刊:
FRONTIERS IN PSYCHOLOGY,2024年15:1287752 ISSN:1664-1078
通讯作者:
Dong, LS
作者机构:
[Dong, Liangshan; Fan, Rong; Dong, LS] China Univ Geosci, Sch Phys Educ, Wuhan, Peoples R China.;[Shen, Bo] Wayne State Univ, Div Kinesiol, Detroit, MI USA.;[Bo, Jin] Eastern Michigan Univ, Dept Psychol, Ypsilanti, MI USA.;[Pang, Yanli] Cent China Normal Univ, Sch Phys Educ, Wuhan, Peoples R China.;[Song, Yu] Ji Mei Univ, Sch Phys Educ, Xiamen, Peoples R China.
通讯机构:
[Dong, LS ] C;China Univ Geosci, Sch Phys Educ, Wuhan, Peoples R China.
关键词:
Children with autism spectrum disorders;typically developing children;Fundamental motor skills;motor deficits;MABC-2
摘要:
Background: Autism Spectrum Disorder (ASD) is a neurodevelopmental condition with unique differences in social interaction, communication, and a spectrum of behavioral characteristics. In the past, motor disturbance in individuals with ASD has not been considered a significant core deficit due to the predominant focus on sociability and communication issues. However, recent studies indicate that motor deficits are indeed associated with the fundamental symptoms of ASD. As there is limited research on the motor behavior of children with ASD, particularly in China, the objective of this study is to investigate the development of fundamental movement skills (FMS) in children with ASD and compare them to typically developing children. Method: The study recruited 108 children with ASD (87 boys, 21 girls) aged 7–10 years from two special education rehabilitation centers in Wuhan, China. For comparison, a control group of 108 typically developing children, matched by age and gender, was randomly selected from three local primary schools. FMS were assessed using the Movement Assessment Battery for Children - Second Edition (MABC-2), which evaluates manual dexterity, aiming and catching, as well as static and dynamic balance. Group differences on MABC-2 percentile scores were analyzed using descriptive statistics and Mann–Whitney U test. Effect sizes were also calculated for practical significance. Results: Findings from the study showed that a significant majority, around 80%, of children with ASD either displayed motor challenges or were at risk of developing such delays. When comparing to their typically developing peers, children with ASD scored notably lower in areas of manual dexterity, ball skills, and both static and dynamic balance (with all these findings being statistically significant at p < 0.001). Interestingly, gender did not show a significant influence on these results (p > 0.05). Conclusion: In addition to addressing the other skill development areas outlined in the diagnostic manual for ASD, clinicians diagnosing and treating children with ASD should also assess the presence of motor skill development. For individuals with ASD who have co-existing motor difficulties, it is essential to offer evidence-based interventions tailored to their specific needs.
通讯机构:
[Hu, P ; Yang, Z] H;Hubei Univ Technol, Sch Sci, Wuhan 430068, Peoples R China.
关键词:
aqueous NH4+-ion batteries;one pot synthesis;prussian blue analogues;reversible electrochemical reaction
摘要:
Ammonium‐ion batteries: NH4+‐rich nickel hexacyanoferrate was successfully synthesized through a facile one‐pot method. It exhibits excellent electrochemical performances as cathode material for ammonium‐ion batteries which can be attributed to reversible redox reaction and durable structure. Abstract Rechargeable aqueous batteries based on ammonium‐ion (NH4+) redox reactions shows great potential for large‐scale energy‐storage due to its plentiful supplies, environmental friendliness, intrinsic security, and sustainability. Prussian blue analogues (PBAs) are regarded to be one of the most promising electrode materials owning to high energy storage density, ease of synthesis, and excellent electrochemical performances. However, the synthesis of ammonium rich Prussian blue analogues is too complicated. Herein, a one pot synthesis of NH4+‐rich nickel hexacyanoferrate (NNiHCF) is developed and the NH4+ storage chemistry is investigated. NNiHCF cathode is coupled with an activated carbon (AC) anode and (NH4)2SO4 aqueous electrolyte to assemble ammonium‐ion batteries. The aqueous full cell demonstrates good electrochemical performance, such as 50.2 mAh g−1 at the current rate of 2 C, and 60 % capacity retention in 5000 cycles. Furthermore, the fundamental characteristics of the reversible redox reaction and the durable structure of NNiHCF are revealed by X‐ray diffraction (XRD) and electrochemical measurements. This work proposes a facile method for the synthesis of ammonium‐rich Prussian.
作者机构:
[Xiang Gao; Yong Zhao] Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA;[Andrew D. Hanlon; Swagato Mukherjee; Peter Petreczky] Physics Department, Brookhaven National Laboratory, Bldg. 510A, Upton, New York 11973, USA;Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China;RIKEN-BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973;Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11790
摘要:
We present a lattice QCD calculation of the transversity isovector- and isoscalar-quark parton distribution functions (PDFs) of the proton utilizing a perturbative matching at next-to-leading-order (NLO) accuracy. Additionally, we determine the isovector and isoscalar tensor charges for the proton. In both calculations, the disconnected contributions to the isoscalar matrix elements have been ignored. The calculations are performed using a single ensemble of Nf=2+1 highly improved staggered quarks simulated with physical-mass quarks and a lattice spacing of a=0.076 fm . The Wilson-clover action, with physical quark masses and smeared gauge links obtained from one iteration of hypercubic smearing, is used in the valence sector. Using the NLO operator product expansion, we extract the lowest four to six Mellin moments and the PDFs via a neural network from the matrix elements in the pseudo-PDF approach. In addition, we calculate the PDFs in the quasi-PDF approach with hybrid-scheme renormalization and the recently developed leading-renormalon resummation technique, at NLO with the resummation of leading small- x logarithms.
摘要:
In this paper, we construct a bounce inflation cosmological scenario in the framework of the modified symmetric teleparallel gravity, namely f(Q) theory, and investigate the tensor perturbations therein. As is well-known, the tensor perturbations generated in the very early Universe (inflation and pre-inflation regions) can account for the primordial gravitational waves (PGWs) that are to be detected by the next generation of GW experiments. We discuss the stability condition of the tensor perturbations in the bounce inflation process and investigate in detail the evolution of the perturbation variable. The general form of the tensor power spectrum is obtained both for large as well as small scale modes. As a result, we show both kinds of modes (short or long wavelength modes), and the tensor spectrum may get a positive tilt in the parametric range where the tensor perturbation proves to be stable-this interestingly hints an enhancement of gravitational waves' amplitude in the background of the f(Q) bounce-inflation scenario. Moreover, we study the LQC-like scenario as a specific case of our model, in which, the primordial tensor power spectrum turns out to be nearly scale-invariant on both small and large scales.
作者机构:
[Xue, Mei; Xue, Hongjin; Qiu, Jianfeng; Zhao, Xin; Zhang, Meng] Shandong First Med Univ & Shandong Acad Med Sci, Sch Radiol, Jinan 250000, Peoples R China.;[Yang, Jiaxin] Shandong First Med Univ & Shandong Acad Med Sci, Sch Basic Med Sci, Jinan 250000, Peoples R China.;[Sun, Wei] Hainan Normal Univ, Coll Chem & Chem Engn, Key Lab Laser Technol & Optoelect Funct Mat Hainan, Haikou 571158, Peoples R China.;[Zhu, Zhihong] Cent China Normal Univ, Inst Nanosci & Nanotechnol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
通讯机构:
[Qiu, JF ] S;[Zhu, ZH ] C;Shandong First Med Univ & Shandong Acad Med Sci, Sch Radiol, Jinan 250000, Peoples R China.;Cent China Normal Univ, Inst Nanosci & Nanotechnol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
摘要:
Chemodynamic therapy (CDT) is a promising cancer treatment strategy. However, mild acidic pH, insufficient H(2)O(2) content, and overexpressed glutathione (GSH) in the tumor microenvironment (TME) severely impair CDT efficiency. In this study, a novel therapeutic nanosystem (Cu/ZIF-8/Vc-Ca/HA) was constructed for H(2)O(2) self-supply and GSH depletion co-enhanced CDT. Typically, calcium ascorbate (Vc-Ca) loaded on the surface of Cu(2+)-doped ZIF-8 (Cu/ZIF-8) was designed as an original source for H(2)O(2) generation, and a hyaluronic acid (HA) shell was subsequently coated to act as a tumor-targeted "guide" and protective layer. Along with the HA shell disintegrated in the TME, exposed Cu/ZIF-8/Vc-Ca dissociated in the tumor acidic microenvironment, thus triggering the release of Vc-Ca and Cu(2+). Vc-Ca selectively produced H(2)O(2) in tumor cells, which provided abundant H(2)O(2) for boosting Fenton-like reactions. Meanwhile, the released Cu(2+) could get converted into Cu(+) by consuming excess intracellular GSH, which could reduce the tumor antioxidant capability of the nanosystem. Moreover, byproduct Cu(+) reacted with abundant H(2)O(2) by a highly efficient Fenton-like reaction to generate toxic ˙OH. Biological assays indicated that the Cu/ZIF-8/HA@Vc-Ca nanosystem showed significant anticancer activity by enhancing the CDT process. This study may provide a new strategy for improving the effectiveness of CDT.
通讯机构:
[Tan, HT ; Xiong, H ] H;[Li, J ] Z;[Ding, MS ] D;Dalian Polytech Univ, Basic Educ Dept, Dalian 116034, Peoples R China.;Huazhong Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
关键词:
cavity quantum electrodynamics;hybrid magnonics;magnomechanics;optomechanics;quantum optics;quantum information
摘要:
Hybrid quantum systems based on magnons in magnetic materials have made significant progress in the past decade. They are built based on the couplings of magnons with microwave photons, optical photons, vibration phonons, and superconducting qubits. In particular, the interactions among magnons, microwave cavity photons, and vibration phonons form the system of cavity magnomechanics (CMM), which lies in the interdisciplinary field of cavity QED, magnonics, quantum optics, and quantum information. Here, we review the experimental and theoretical progress of this emerging field. We first introduce the underlying theories of the magnomechanical coupling, and then some representative classical phenomena that have been experimentally observed, including magnomechanically induced transparency, magnomechanical dynamical backaction, magnon-phonon cross-Kerr nonlinearity, etc. We also discuss a number of theoretical proposals, which show the potential of the CMM system for preparing different kinds of quantum states of magnons, phonons, and photons, and hybrid systems combining magnomechanics and optomechanics and relevant quantum protocols based on them. Finally, we summarize this review and provide an outlook for the future research directions in this field.
作者:
Wang, Tong;Cui, Jianqun;Chang, Yanan;Huang, Feng;Yang, Yi
期刊:
Electronics,2024年13(5):868- ISSN:2079-9292
通讯作者:
Cui, JQ
作者机构:
[Huang, Feng; Wang, Tong] Cent China Normal Univ, Sch Phys Sci & Technol, 152 Luoyu Rd, Wuhan 430079, Peoples R China.;[Cui, Jianqun; Huang, Feng; Chang, Yanan; Wang, Tong; Cui, JQ] Cent China Normal Univ, Sch Comp Sci, 152 Luoyu Rd, Wuhan 430079, Peoples R China.;[Yang, Yi] NE Illinois Univ, Dept Comp Sci, Chicago, IL 60625 USA.
通讯机构:
[Cui, JQ ] C;Cent China Normal Univ, Sch Comp Sci, 152 Luoyu Rd, Wuhan 430079, Peoples R China.
关键词:
opportunistic mobile networks;energy-efficient;geographic information
摘要:
Opportunistic mobile networks, as an important supplement to the traditional communication methods in unique environments, are composed of mobile communication devices. It is a network form that realizes message transmission by using the opportune encounter of these mobile communication devices. Consequently, mobile communication devices necessitate periodic contact detection in order to identify potential communication opportunities, thereby leading to a substantial reduction in the already limited battery life of such devices. Previous studies on opportunistic networks have often utilized geographic information in routing design to enhance message delivery rate. However, the significance of geographic information in energy conservation has been overlooked. Furthermore, previous research on energy-efficient routing has lacked diversification in terms of the methods employed. Therefore, this paper proposes a dynamic co-operative energy-efficient routing algorithm based on geographic information perception (DCEE-GIP) to leverage geographic information to facilitate dynamic co-operation among nodes and optimize node sleep time through probabilistic analysis. The DCEE-GIP routing and other existing algorithms were simulated using opportunistic network environment (ONE) simulation. The results demonstrate that DCEE-GIP effectively extends network service time and successfully delivers the most messages. The service time of DCEE-GIP increased by 8.05 similar to 31.11%, and more messages were delivered by 14.82 similar to 115.9%.
作者:
Si-Yu Tang;Liang Zheng;Xiao-Ming Zhang;Ren-Zhuo Wan
期刊:
核技术(英文版),2024年35(2):1-10 ISSN:1001-8042
通讯作者:
Liang Zheng<&wdkj&>Xiao-Ming Zhang<&wdkj&>Ren-Zhuo Wan
作者机构:
[Si-Yu Tang] School of Mathematical and Physical Sciences, Wuhan Textile University, Wuhan, China;[Liang Zheng] School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan, China;[Xiao-Ming Zhang] Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan, China;Hubei Key Laboratory of Digital Textile Equipment, Wuhan Textile University, Wuhan, China;School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan, China
通讯机构:
[Liang Zheng] S;[Xiao-Ming Zhang] K;[Ren-Zhuo Wan] H;School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan, China<&wdkj&>Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan, China<&wdkj&>Hubei Key Laboratory of Digital Textile Equipment, Wuhan Textile University, Wuhan, China<&wdkj&>School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan, China
关键词:
Azimuthal anisotropy;Small collision systems;Transport model
摘要:
The elliptic azimuthal anisotropy coefficient (
$$v_{2}$$
) of the identified particles at midrapidity (
$$|\eta |<0.8$$
) was investigated in p–Pb collisions at
$$\sqrt{s_{\textrm{NN}}}= 5.02 \,\hbox {TeV}$$
using a multi-phase transport model (AMPT). The calculations of differential
$$v_{2}$$
based on the advanced flow extraction method of light flavor hadrons (pions, kaons, protons, and
$$\Lambda$$
) in small collision systems were extended to a wider transverse momentum (
$$p_{{\textrm{T}}}$$
) range of up to 8 GeV/c for the first time. The string-melting version of the AMPT model provides a good description of the measured
$$p_{{\textrm{T}}}$$
-differential
$$v_{2}$$
of the mesons but exhibits a slight deviation from the baryon
$$v_{2}$$
. In addition, we observed the features of mass ordering at low
$$p_{{\textrm{T}}}$$
and the approximate number-of-constituent-quark (NCQ) scaling at intermediate
$$p_{{\textrm{T}}}$$
. Moreover, we demonstrate that hadronic rescattering does not have a significant impact on
$$v_{2}$$
in p–Pb collisions for different centrality selections, whereas partonic scattering dominates in generating the elliptic anisotropy of the final particles. This study provides further insight into the origin of collective-like behavior in small collision systems and has referential value for future measurements of azimuthal anisotropy.
期刊:
BRIEFINGS IN BIOINFORMATICS,2024年25(2) ISSN:1467-5463
通讯作者:
Peng, YH
作者机构:
[Xu, Wang; Peng, Yunhui; Zhang, Houfang; Peng, YH; Zhao, Yunjie] Cent China Normal Univ, Inst Biophys, Wuhan, Peoples R China.;[Xu, Wang; Peng, Yunhui; Zhang, Houfang; Peng, YH; Zhao, Yunjie] Cent China Normal Univ, Dept Phys, Wuhan, Peoples R China.;[Guo, Wenhan] Univ Texas El Paso, Computat Sci Program, El Paso, TX USA.;[Jiang, Lijun] Cent China Normal Univ, Sch Life Sci, Wuhan, Peoples R China.
通讯机构:
[Peng, YH ] C;Cent China Normal Univ, Inst Biophys, Wuhan, Peoples R China.;Cent China Normal Univ, Dept Phys, Wuhan, Peoples R China.
关键词:
histone/nucleosome interaction;interaction network;histone cancer mutation;nucleosome binding mode;epigenetic regulation
摘要:
Nucleosomes represent hubs in chromatin organization and gene regulation and interact with a plethora of chromatin factors through different modes. In addition, alterations in histone proteins such as cancer mutations and post-translational modifications have profound effects on histone/nucleosome interactions. To elucidate the principles of histone interactions and the effects of those alterations, we developed histone interactomes for comprehensive mapping of histone-histone interactions (HHIs), histone-DNA interactions (HDIs), histone-partner interactions (HPIs) and DNA-partner interactions (DPIs) of 37 organisms, which contains a total of 3808 HPIs from 2544 binding proteins and 339 HHIs, 100 HDIs and 142 DPIs across 110 histone variants. With the developed networks, we explored histone interactions at different levels of granularities (protein-, domain- and residue-level) and performed systematic analysis on histone interactions at a large scale. Our analyses have characterized the preferred binding hotspots on both nucleosomal/linker DNA and histone octamer and unraveled diverse binding modes between nucleosome and different classes of binding partners. Last, to understand the impact of histone cancer-associated mutations on histone/nucleosome interactions, we complied one comprehensive cancer mutation dataset including 7940 cancer-associated histone mutations and further mapped those mutations onto 419,125 histone interactions at the residue level. Our quantitative analyses point to histone cancer-associated mutations' strongly disruptive effects on HHIs, HDIs and HPIs. We have further predicted 57 recurrent histone cancer mutations that have large effects on histone/nucleosome interactions and may have driver status in oncogenesis.
作者:
Zhou, Rui;Chen, Menglin L. N.;Shi, Xintong;Ren, Yan;Yu, Zihao;...
期刊:
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION,2024年72(2):2058-2063 ISSN:0018-926X
通讯作者:
Chen, MLN;Lin, H
作者机构:
[Zhou, Rui; Chen, Menglin L. N.] Hong Kong Polytech Univ, Dept Elect & Elect Engn, Hong Kong, Peoples R China.;[Zhou, Rui; Ren, Yan; Yu, Zihao; Lin, Hai; Lin, H; Shi, Xintong] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Liu, Y.; Tian, Yu] Hubei Univ, Sch Phys, Dept Phys, Wuhan 430062, Hubei, Peoples R China.;[Liu, Y.] Lanzhou Univ, Lanzhou Ctr Theoret Phys, Key Lab Theoret Phys Gansu, Lanzhou 730000, Gansu, Peoples R China.;[Liu, Y.] Lanzhou Univ, Key Lab Quantum Theory & Applicat MoE, Lanzhou 730000, Gansu, Peoples R China.
通讯机构:
[Lin, H ] C;[Chen, MLN ] H;Hong Kong Polytech Univ, Dept Elect & Elect Engn, Hong Kong, Peoples R China.;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
摘要:
Waveguides are fundamental components in communication systems. However, they suffer from reflection and scattering losses at sharp routes or defects. The breakthrough in developing topological photonic crystals (PhCs) provides promising solutions to robust signal transmission. In this work, we propose a new mechanism for protecting wave-guiding modes by decorating the boundaries of a conventional waveguide with valley-Hall PhCs. This special layout enables the robust propagation of conventional transverse electric (TE) waves against defects and bends. Moreover, the proposed waveguide is compatible with the substrate-integrated waveguide (SIW). High-efficient mode conversion from the SIW to the proposed waveguide is achievable. By leveraging the idea of topology to conventional waveguides, we provide a powerful and practical tool that can largely improve the performance of microwave and millimeter-wave integrated circuits while reserving the features of wave-guiding modes.
期刊:
Microwave and Optical Technology Letters,2024年66(1):e33954- ISSN:0895-2477
通讯作者:
Jin, J
作者机构:
[Ma, Li; Liu, Wei] Tianjin Univ, Sch Microelect, Tianjin, Peoples R China.;[Zhang, Qi-Jun] Carleton Univ, Dept Elect, Ottawa, ON, Canada.;[Jin, Jing] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Peoples R China.;[Zhang, Jianan] Southeast Univ, State Key Lab Millimeter Waves, Nanjing, Peoples R China.
通讯机构:
[Jin, J ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Peoples R China.
关键词:
electromagnetic;finite element method;Padé via Arnoldi;single-size simplification
摘要:
Abstract This paper proposes a new Padé via Arnoldi algorithm with single‐size matrix simplification for electromagnetic (EM) fast frequency sweep. New equations are derived to reduce the double‐size system matrix to single‐size system matrix. We also propose a systematic algorithm to calculate S‐parameters using the simplified single‐size system matrix. Using the proposed algorithm, the EM responses can be obtained with the same accuracy while consuming much less time compared with that using the existing double‐size matrix Padé via Lanczos. The proposed algorithm is demonstrated by two microwave examples.
摘要:
Zinc metal batteries (ZMBs) have received a lot of attention due to their high capacity, proper redox potential and low cost. However, zinc anodes suffer from serious dendritic problems and side reactions, resulting in poor cycling stability of zinc ion batteries. Herein, organic additive trimethyl phosphate (TMP) is introduced into inexpensive ZnSO4 electrolyte to stabilize Zn anode. TMP exhibits bifunctional properties in this cost-effective electrolyte system. It prefers adsorbing on (002) plane of zinc which leads to preferential crystal growth and uniform zinc deposition. Moreover, TMP can reshape the original hydrogen bond network, regulate the solvation structure and inhibit the parasitic reaction generated by water. As a result, the zinc anode with TMP addition could maintain 2000 h at a current density of 0.5 mA cm−2 which is superior to bare zinc anode. When paired with V2O5 cathode, the full cell also shows excellent cyclic performance. Such a low-cost bifunctional additive would offer a strategy for stabilizing Zn plating/stripping behaviors and suppressing side reactions in mild aqueous electrolyte.
作者机构:
[Wang, Fei; Wang, F; Kong, Deyi] Hubei Univ Technol, Sch Sci, Wuhan 430068, Peoples R China.;[Xu, Jun] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
通讯机构:
[Wang, F ] H;Hubei Univ Technol, Sch Sci, Wuhan 430068, Peoples R China.
摘要:
We propose a scheme to generate nonreciprocal entanglement between an yttrium iron garnet (YIG) sphere and two nitrogen -vacancy -center ensembles by magnon Kerr effects in a transmission -line resonator. By driving the YIG sphere appropriately, strong Kerr nonlinearities emerge and then induce magnon parametric amplification and magnon frequency shift, resulting in the appearance of optimal entanglements. Depending on the direction of the bias magnetic field, macroscopic nonreciprocal entanglement is realized in this all -solid-state quantum system, which may find potential applications in chiral quantum information processing.
作者机构:
State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing , China;Frontier Science Center for Quantum Information, Beijing , China;e-mail: ycliu@tsinghua.edu.cn;Department of Physics, Huazhong Normal University, Wuhan , China;e-mail: gaox@mail.ccnu.edu.cn
关键词:
光学期刊,光学期刊联盟,光学论文,光电资讯,光电社区,光学人物,光学专家,光学实验室,光学文献,编辑出版,光学权威,光学前沿,光学会议,微信智能应答服务,光学资源库,DOI代理注册,高功率激光,High Power Laser Science and Engineer,光子学研究,Photonics Research,中国光学快报,COL,Chinese Optics Letters,光学学报,中国激光,激光与光电子学进展
摘要:
Subnatural-linewidth single photons are of vital importance in quantum optics and quantum information science. According to previous research, it appears difficult to utilize resonance fluorescence to generate single photons with subnatural linewidth. Here we propose a universally applicable approach to generate fluorescent single photons with subnatural linewidth, which can be implemented based on Λ-shape and similar energy structures. Further, the general condition to obtain fluorescent single photons with subnatural linewidth is revealed. The single-photon linewidth can be easily manipulated over a broad range by external fields, which can be several orders of magnitude smaller than the natural linewidth. Our study can be easily implemented in various physical platforms with current experimental techniques and will significantly facilitate the research on the quantum nature of resonance fluorescence and the technologies in quantum information science.
摘要:
Due to its controllable maneuverability, wide coverage, and low cost, unmanned aerial vehicle (UAV) has great potential in post-disaster rescue, cargo transport and emergency communication. Considering its limited onboard energy, energy -efficient UAV communication is a challenge. This research examines the security of simultaneous wireless information and power transfer (SWIPT) systems assisted by intelligent reflecting surfaces (IRS) and UAVs while considering the flight energy of rotary-wing UAVs. Specifically, an IRS is mounted on a UAV to enhance the quality of legitimate transmission, and artificial noise (AN) is introduced into the base station (BS) to reduce eavesdropping quality. The power splitting (PS) technology is adopted at ground devices (GDs) to simultaneously decode information and harvest energy. First, we jointly design the BS transmit beamforming, UAV-IRS phase shifts and trajectory/velocity as well as GDs PS ratio with the aim of maximizing the sum secrecy rate of all GDs. Then, an iterative algorithm is developed to address the formulated problem. In particular, additional variables are introduced to handle this complicated objective function, and the original problem is decoupled into multiple sub-problems, which can be solved alternately by invoking the successive convex approximation (SCA) and semidefinite relaxation (SDR) techniques. Finally, numerical results demonstrate that the proposed scheme exhibits a substantial performance in the security rate of SWIPT systems assisted by UAV-IRS, and its performance is improved by at least 12% compared to benchmark schemes at the flight energy budget e(thr) = 5KJ and the number of reflecting elements N-r = 25.
摘要:
The main goal of this paper is to investigate the predefined-time sliding mode control and synchronization of uncertain hyperchaotic systems and its application in secure communication. Firstly, a novel predefined-time sliding surface is designed. Then a predefined-time sliding mode controller is proposed for uncertain hyperchaotic systems, which can guarantee synchronization of the master-slave system within a predefined time in the presence of parameter uncertain and external disturbance. Specially, the settling time, as a part of control parameters, can be predefined as needed independent of initial conditions. Furthermore, the validity of the proposed approach is proved by Lyapunov stability theory. Finally, comparative tests and image encryption application are given to show advantages of the proposed method.