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Science China(Physics,Mechanics & Astronomy) 2022年第3期65卷 39-48页

作者： Bin Zhu xuewen liu Department of Physics Yantai UniversityYantai 264005China

Flavor-specific scalar bosons exist in various Standard Model extensions and couple to a single generation of fermions via a global flavor symmetry breaking mechanism. Given this strategy, we propose a Me V flavor-specific scalar model in dimension-5 operator series, which explains the muon g-2 anomaly and proton radius puzzle by coupling with the muon and down-quark at the same time. The framework is consistent with the null result of high-intensity searches. Specifically, the supernova constraints for muon couplings become weakened by including the contribution of down-quark interaction. The parameter space for explaining muon g-2 discrepancy is available when 10% energy deposition is required in the energy explosion process in the supernova,but this is ruled out by the 1% energy deposition requirement. We also investigate the searches for mediator and dark matter and the resulting constraints on viable parameter space such as nuclear physics constraints, direct detection for light boosted dark matter, and possible CMB constraints. When compared with conventional dark matter production, light dark matter production has two additional modifications: bound state formation and early kinetic equilibrium decoupling. We are now looking into the implications of these effects on the relic density of light dark matter.

关键词： muon g-2 proton radius puzzle DM relic density precision calculation

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Results on the realization of Boolean control networks by the vertex partition method

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Science China(Information Sciences) 2023年第7期66卷 210-223页

作者： Yifeng LI Jiandong ZHU xuewen liu National Center for Applied Mathematics in Chongqing Chongqing Normal University School of Mathematical Sciences Nanjing Normal University

Realization problems, including the minimum realization of Boolean control networks(BCNs),are investigated by the vertex partition method. A general definition of the realization for BCNs that does not involve any subspaces is proposed. For the new and existing realization definitions, by a common concolorous perfect vertex partition(CCP-VP) of vertex-colored state transition graphs, an equivalence relation and a quotient mapping are defined, which induce a quotient system, i.e., the realization of original BCNs. In addition, if the CCP-VP is an equal partition, a realization induced by a Y-friendly controlled invariant regular subspace is constructed. Finally, an algorithm is designed to construct the minimum realization of BCNs for different realization definitions, and three examples are given to illustrate the obtained results.

关键词： Boolean control networks realization semi-tensor product of matrices vertex partition state transition graph

Whittaker modules over loop Virasoro algebra

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Frontiers of Mathematics in China 2013年第2期8卷 393-410页

作者： xuewen liu Xiangqian GUO Department of Mathematics Zhengzhou University Zhengzhou 450001 China

In this paper, we study Whittaker modules over the loop Virasoro algebra relative to some total order. We give a description of all Whittaker vectors for the universal Whittaker modules. We also show that any universa... 详细信息

关键词： Loop Virasoro algebra Whittaker module Whittaker vector

Optical SDMA for applying compressive sensing in WSN

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Journal of Systems Engineering and Electronics 2016年第4期27卷 780-789页

作者： xuewen liu Song Xiao Lei Quan School of Telecommunications Engineering Xidian University

In order to apply compressive sensing in wireless sensor network, inside the nodes cluster classified by the spatial correlation, we propose that a cluster head adopts free space optical communication with space division multiple access, and a sensor node uses a modulating retro-reflector for communication. Thus while a random sampling matrix is used to guide the establishment of links between head cluster and sensor nodes, the random linear projection is accomplished. To establish multiple links at the same time, an optical space division multiple access antenna is designed. It works in fixed beams switching mode and consists of optic lens with a large field of view（FOV）, fiber array on the focal plane which is used to realize virtual channels segmentation, direction of arrival sensor, optical matrix switch and controller. Based on the angles of nodes＇ laser beams, by dynamically changing the route, optical matrix switch actualizes the multi-beam full duplex tracking receiving and transmission. Due to the structure of fiber array, there will be several fade zones both in the focal plane and in lens＇ FOV. In order to lower the impact of fade zones and harmonize multibeam, a fiber array adjustment is designed. By theoretical, simulated and experimental study, the antenna＇s qualitative feasibility is validated.

关键词： wireless sensor network compressive sensing space division multiple access optical matrix switch laser beam tracking

Lattice Boltzmann study of the interaction between a single solid particle and a thin liquid film

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Applied Mathematics and Mechanics(English Edition) 2020年第8期41卷 1179-1194页

作者： Xiaojun QUAN xuewen liu Jinjing LI Xunji GAO MOE Key Laboratory for Power Machinery and Engineering School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

The isothermal single-component multi-phase lattice Boltzmann method(LBM)combined with the particle motion model is used to simulate the detailed process of liquid film rupture induced by a single spherical *** entire process of the liquid film rupture can be divided into two *** Stage 1,the particle contacts with the liquid film and moves into it due to the interfacial force and finally penetrates the liquid *** in Stage 2,the upper and lower liquid surfaces of the thin film are driven by the capillary force and approach to each other along the surface of the particle,resulting in a complete *** is found that a hydrophobic particle with a contact angle of 106.7°shows the shortest rupture duration when the liquid film thickness is less than the particle *** the thickness of the liquid film is greater than the immersed depth of the particle at equilibrium,the time of liquid film rupture caused by a hydrophobic particle will be *** the other hand,a moderately hydrophilic particle can form a bridge in the middle of the liquid film to enhance the stability of the thin liquid film.

关键词： lattice Boltzmann method(LBM) liquid film defoaming wettability solid particle

Footprints of axion-like particle in pulsar timing array data and James Webb Space Telescope observations

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Science China(Physics,Mechanics & Astronomy) 2024年第11期67卷 55-62页

作者： Shu-Yuan Guo Maxim Khlopov xuewen liu Lei Wu Yongcheng Wu Bin Zhu Department of Physics Yantai UniversityYantai 264005 China Institute of Physics Southern Federal UniversityRostov on Don 344090 Russia National Research Nuclear University MEPhI(Moscow Engineering Physics Institute) Moscow 115409 Russia Virtual Institute of Astroparticle Physics Paris 75018 France Department of Physics and Institute of Theoretical Physics Nanjing Normal UniversityNanjing 210023 China

Several pulsar timing array(PTA) collaborations have recently reported the evidence for a stochastic gravitational-wave background(SGWB), which can unveil the formation of primordial seeds of inhomogeneities in the early universe. With the SGWB parameters inferred from PTAs data, we can make a prediction of the seeds for early galaxy formation from the domain walls in the axion-like particles(ALPs) field distribution. This also naturally provides a solution to the observation of high redshifts by the James Webb Space Telescope. The predicted photon coupling of the ALP is within the reach of future experimental searches.

关键词： stochastic gravitational-wave background pulsar timing array axion-like particle JWST

Probing inelastic signatures of dark matter detection via polarized nucleus

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Chinese Physics C 2024年第10期48卷 72-85页

作者： Zai Yun Junwei Sun Bin Zhu xuewen liu Department of Physics Yantai UniversityYantai 264005China

We investigate the inelastic signatures of dark matter-nucleus interactions,explicitly focusing on the ramifications of polarization,dark matter splitting,and the Migdal *** detection experiments,crucial for testing the existence of dark matter,encounter formidable obstacles,such as indomitable neutrino backgrounds and elusive determination of dark matter *** overcome these challenges,we explore the potential of polarized-target dark matter scattering,examining the impact of nonvanishing mass splitting,and the role of the Migdal effect in detecting dark *** analysis demonstrates the valuable utility of the polarized triple-differential event rate as an effective tool for examining inelastic dark *** enables us to investigate angular and energy dependencies,providing valuable insights into the scattering process.

关键词： inelastic dark matter polarized target dark matter direct detection

Study of transient luminescence of three kinds of Ru complexes bound to DNA

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Science China(Physics,Mechanics & Astronomy) 2008年第2期51卷 133-139页

作者： ZHU WeiLing liu xuewen WANG Hui YU HuiJuan LI AiZheng CHAO Hui ZHENG KangCheng JI LiangNian State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen UniversityGuangzhou 510275China College of Chemistry and Chemical Engineering Sun Yat-sen UniversityGuangzhou 510275China Department of Technical Physics Maoming CollegeMaoming 525000China

The transient luminescence of three kinds of ruthenium complexes [Ru(bpy)2(7-CH3-dppz)]2+, [Ru(bpy)2(7-F-dppz)]2+ and [Ru(phen)2(7-F-dppz)]2+ bound to calf thy-mus DNA (ctDNA) has been studied by using the time-resolved spectroscopy. The results show that the luminescence is due to the radiative decay from the charge-transfer states to the ground state. By the interaction with DNA, the radia-tiveless rate of the photoexcited Ru complex molecules decreases, which results in the increase of luminescence lifetime and efficiency. The structure of the Ru com-plex has an important impact on the interaction with DNA. The [Ru(bpy)2(7-CH3-dppz)]2+ shows the longest luminescence lifetime (about 382 ns), while the [Ru(bpy)2(7-F-dppz)]2+ shows the shortest lifetime (about 65 ns). The possible origin of the luminescence dynamics is discussed.

关键词： ultrafast photoelectronics transient luminescence DNA and Ru complex ultrafast spectroscopic technology

The calmodulin-dependent protein kinase II inhibitor KN-93 protects rat cerebral cortical neurons from N-methyl-D-aspartic acid-induced injury

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Neural Regeneration Research 2013年第2期8卷 111-120页

作者： xuewen liu Cui Ma Ruixian Xing Weiwei Zhang Buxian Tian Xidong Li Qiushi Li Yanhui Zhang Department of Neurology First Affiliated Hospital of Liaoning Medical College Liaoning Medical College Jinzhou Kangning Hospital

In this study, primary cultured cerebral cortical neurons of Sprague-Dawley neonatal rats were treated with 0.25, 0.5, and 1.0 μM calmodulin-dependent protein kinase II inhibitor KN-93 after 50 μM N-methyI-D-aspartic acid-induced injury. Results showed that, compared with N-methyi-D- aspartic acid-induced injury neurons, the activity of cells markedly increased, apoptosis was significantly reduced, leakage of lactate dehydrogenase decreased, and intracellular Ca2＋ concentrations in neurons reduced after KN-93 treatment. The expression of caspase-3, phosphorylated calmodulin-dependent protein kinase II and total calmodulin-dependent protein kinase II protein decreased after KN-93 treatment. And the effect was apparent at a dose of 1.0 pM KN-93. Experimental findings suggest that KN-93 can induce a dose-dependent neuroprotective effect, and that the underlying mechanism may be related to the down-regulation of caspase-3 and calmodulin- dependent protein kinase II expression.

关键词： neural regeneration brain injury calmodulin-dependent protein kinase II KN-93 N-methyi-D-aspartic acid caspase-3 calcium ion apoptosis neuroprotection grant-supported paper photographs-containing paper neuroregeneration

Critical Velocity of Short Floating Slab Track Using Alterable Element Method Considering Wheel-Rail Contact Loss

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Journal of Shanghai Jiaotong university(Science) 2020年第6期25卷 714-720页

作者： ZHANG Jingwei liu xuewen WANG Yansong WANG Yingyi LI Ke School of Mechanical and Automotive Engineering Shanghai University of Engineering ScienceShanghai 201620China School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

In actual line operation,the critical velocity is one of the key physical quantities of rail design owing to its great infuence on the riding comfort and safety of vehicles due to the wheel-rail contact loss caused by the abrupt change of rail foundation rigidity,rail wear,or abruptness irregularities on *** this study,the short floating slab track(SFST)structure is regarded as a double-layer *** Euler beam and the rigid body model are adopted for the rail and the floating slab,*** the dispersion equation and the theoretical critical velocity of the rail structure under ideal conditions are ***,this st udy considers the implementation of the SFST in the vehicle-structure coupling *** alterable element method is introduced for accurately simulating the change of the whee-rail contact state and coding a vehicle-structure dynamic analysis program(VSDAP)to calculate the critical velocity of rail structures from the dynamic response of vehicles and rail *** principle of its design at the beginning of the design is given on the basis of the theoretical value of the critical velocity and the simulation of the dynamic response,which can provide reference for practical engineering design.

关键词： contact loss short floating slab track(SFST) critical velocity alterable element method