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Liutex-based vortex dynamics:A preliminary study

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Journal of Hydrodynamics 2020年第6期32卷 1217-1220页

作者： Hai-dong yu Yi-qian Wang School of Aerospace Engineering Tsinghua UniversityBeijing100084China School of Mathematical Science Soochow UniversitySuzhou215006China

Vortex dynamics,with the possibility of efficient flow control,is explored in this study based on the new introduced vortex definition and identification system of *** the six core elements of vortex identification,including(1)absolute strength,(2)relative strength,(3)local rotational axis,(4)global rotational axis,(5)vortex core size and(6)vortex boundary,provided by the Liutex system,it is possible to numerically devise strategies,primarily by introducing additional source terms in Navier-Stokes equations,which we call Liutex force field model here,to control the vortex *** methodologies of centripetal force model and counter-rotation force model are preliminarily investigated in a cavitating flow around two-dimensional Clark-Y *** is found that Liutex based models are capable of illustrating the vortex dynamics and possibly strengthening or weakening the vortices.

关键词： Vortex dynamics Liutex vector flow control

Two-Photon Exchange Corrections to Single Spin Asymmetry of Neutron and 3He

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Communications in Theoretical Physics 2011年第3期55卷 489-494页

作者： CHEN Dian-Yong dong yu-Bing Research Center for Hadron and CSR Physics Lanzhou University ＆ Institute of Modern Physics of CAS Lanzhou 73000 China Institute of Modern Physics Chinese Academy of Science Lanzhou 730000 China Institute of High Energy Physics Chinese Academy of Science Beijing 100049 China Theoretical Physics Center for Science Facilities Chinese Academy of Science Beijing 100049 China

In a simple hadronie model, the two-photon exchange contributions to the single spin asymmetries for the nucleon and the 3He are estimated. The results show that the elastic contributions of two-photon exchange to the single spin asymmetries for the nucleon are rather small while those for the 3He are relatively large. Besides the strong angular dependence, the two-photon contributions to the single transfer. spin asymmetry for the 3He are very sensitive to the momentum

关键词： simple hadronic model two-photon exchange single spin asymmetry

Entanglement of Generalized Two-Mode Binomial States and Teleportation

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Communications in Theoretical Physics 2009年第4期51卷 631-636页

作者： WANG dong-Mei yu You-Hong Department of Applied Physics Zhejiang University of Technology Hangzhou 310032 China

The entanglement of the generalized two-mode binomial states in the phase damping channel is studied by making use of the relative entropy of the entanglement. It is shown that the factors of q and p play the crucial roles in control the relative entropy of the entanglement. Furthermore, we propose a scheme of teleporting an unknown state via the generalized two-mode binomial states, and calculate the mean fidelity of the scheme.

关键词： entanglement generalized two-mode binomial states teleportation

Electroproduction of Roper Resonance in a Meson Cloud Model

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Communications in Theoretical Physics 2008年第7期50卷 142-148页

作者： CHEN Dian-Yong dong yu-Bing Institute of High Energy Physics the Chinese Academy of Sciences Beijing 100049 China

The Q^2 dependencies of Roper resonance (N~* (1440)) helicity amplitudes have been discussed based on twoassumptions:(i) the Roper resonance is an excitation of one of the three quarks,and (ii) the quarks are surrounded bya pion-meson *** study shows that the mixing of the ground state in the Roper wavefunction caused by the pionmeson cloud together with the pion meson cloud itself is crucial for the predictions of the photoproduction amplitudesof the Roper *** is found that our model can give a good description for the helicity amplitudes of the Roperresonance comparing with the experimental measurement.

关键词： photo-production amplitudes Roper resonance meson cloud

Interference coordination schemes for cellular network assisted device-to-device multicast

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The Journal of China Universities of Posts and Telecommunications 2013年第5期20卷 63-70页

作者： WANG dong-yu WANG Xiao-xiang WANG yu-long Key Laboratory of Universal Wireless Communications Ministry of EducationBeijing University of Posts and Telecommunications

In this paper, a multicast concept for device-to-device （D2D） communication underlaying a cellular infrastruc^tre is investigated. To increase the overall capacity and improve resource utilization, a novel interference coordination scheme is proposed. The proposed scheme includes two steps. First, in order to mitigate the interference from D2D multicast transmission to cellular networks （CNs）, a dynamic power control scheme is proposed that can determine the upper bound of D2D transmitter power based on the location of base station （BS） and areas of adjacent cells from the coverage area of D2D multicast group. Next, an interference limited area control scheme that reduces the interference from CNs to each D2D multicast receiver is proposed. The proposed scheme does not allow the coexistence of cellular user equipments （CUEs） located in the interference limited area to reuse the same resources as the D2D multicast group. From the simulation results, it is confirmed that the proposed schemes improve the performance of the hybrid system compared to the conventional ways.

关键词： OFDM wireless system feedback load reduction multicast system unicast system opportunistic feedback scheme

Improving EGT sensing data anomaly detection of aircraft auxiliary power unit

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Chinese Journal of Aeronautics 2020年第2期33卷 448-455页

作者： Liansheng LIU yu PENG Lulu WANG yu dong Datong LIU Qing GUO School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150080China China Southern Airlines Company Limited Shenyang Maintenance Base Shenyang 110169China China Southern Airlines Engineering Technology Research Center Shenyang 110169China

The reliability of the on-wing aircraft Auxiliary Power Unit(APU)decides the cost and the comfort of flight to a large *** most important function of APU is to help start main engines by providing compressed *** on the condition of sudden shutdown in the air,APU can offer additional thrust for ***,its condition monitoring has drawn much attention from the academic and industrial *** the on-wing sensing data which can reflect its condition,Exhaust Gas Temperature(EGT)is one of the most important *** ensure the reliability of EGT,one kind of data-driven anomaly detection framework for EGT sensing data is proposed based on the Gaussian Process Regression and Kernel Principal Component *** situations of one-dimensional and two-dimensional input data for EGT anomaly detection are considered,*** cross-validation experiments are carried out by utilizing the real condition data of APU,which are provided by China Southern Airlines Company Limited Shenyang Maintenance *** anomalous stuck condition of EGT sensing data is also *** results show that the proposed EGT sensing data anomaly detection method can achieve better performance of false positive ratio,false negative ratio and accuracy.

关键词： Anomaly detection Auxiliary power unit Condition-based maintenance Data-driven framework Exhaust gas temperature

Early Intervention in Alzheimer’s Disease: How Early is Early Enough?

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Neuroscience Bulletin 2020年第2期36卷 195-197页

作者： dong-yu Fan Yan-Jiang Wang Department of Neurology and Center for Clinical Neuroscience Daping HospitalThird Military Medical UniversityChongqing 400042China Chongqing Key Laboratory of Aging and Brain Diseases Chongqing 400042China

In 1906,*** Alzheimer reported a case of dementia and thought it was a new type of ***,*** Kraepelin named it Alzheimer’s disease(AD).One hundred years later,AD has become the most common type of dementia affecting the elderly population and a heavy health ***,the pathogenesis of the disease remains unclear,and no disease-modifying therapies are available to prevent,halt,or even slow the progression of the disease[1].

关键词： Alzheimer pathogenesis Early

Stability of motor endplates is greater in the biceps than in the interossei in a rat model of obstetric brachial plexus palsy

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Neural Regeneration Research 2020年第9期15卷 1678-1685页

作者： Bo Li Liang Chen yu-dong Gu Department of Hand Surgery Huashan Hospital and Institutes of Biomedical SciencesFudan UniversityShanghaiChina Shanghai Key Laboratory of Peripheral Nerve and Microsurgery ShanghaiChina

The time window for repair of the lower trunk is shorter than that of the upper trunk in patients with obstetric brachial plexus palsy. The denervated intrinsic muscles of the hand become irreversibly atrophic much faster than the denervated biceps. However, it is unclear whether the motor endplates of the denervated interosseous muscles degenerate more rapidly than those of the denervated biceps. In this study, we used a rat model of obstetric brachial plexus palsy of the right upper limb. C5–6 was lacerated distal to the intervertebral foramina, with concurrent avulsion of C7–8 and T1, with the left upper limb used as the control. Bilateral interossei and biceps were collected at 5 and 7 weeks. Immunofluorescence was used to assess the morphology of the motor endplates. Real-time quantitative polymerase chain reaction and western blot assay were used to assess mRNA and protein expression levels of acetylcholine receptor subunits(α, β and δ), rapsyn and β-catenin. Immunofluorescence microscopy showed that motor endplates in the denervated interossei were fragmented, while those in the denervated biceps were morphologically intact with little fragmentation. The number and area of motor endplates, relative to the control side, were significantly lower in the denervated interossei compared with the denervated biceps. mRNA and protein expression levels of acetylcholine receptor subunits(α, β and δ) were significantly lower, whereas β-catenin protein expression was higher, in the denervated interossei compared with the denervated biceps. The protein expression of rapsyn was higher in the denervated biceps than in the denervated interossei at 7 weeks. Our findings demonstrate that motor endplates of interossei are destabilized, whereas those of the biceps remain stable, in the rat model of obstetric brachial plexus palsy. All procedures were approved by the Experimental Animal Ethics Committee of Fudan University, China(approval No. DF-187) in January 2016.

关键词： acetylcholine receptor subunits biceps interossei motor endplates nerve regeneration obstetric brachial plexus palsy peripheral nerve injury

Inertial Viscosity Iterative Method for Solving Pseudo-monotone Variational Inequality Problems and Fixed Point Problems

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Acta Mathematica Sinica,English Series 2022年第5期38卷 937-952页

作者： Gang CAI Qiao Li dong yu PENG School of Mathematics Science Chongqing Normal UniversityChongqing 401331P.R.China College of Science Civil Aviation University of ChinaTianjin 300300P.R.China

In this paper,we investigate a new inertial viscosity extragradient algorithm for solving variational inequality problems for pseudo-monotone and Lipschitz continuous operator and fixed point problems for quasi-nonexpansive mappings in real Hilbert *** convergence theorems are obtained under some appropriate conditions on the ***,we give some numerical experiments to show the advantages of our proposed *** results obtained in this paper extend and improve some recent works in the literature.

关键词： Extragradient method variational inequality fixed point strong convergence quasi-nonexpansive mapping