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Search Results: 1 - 10 of 36929 matches for " Yanxiang Zhao "
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Adhesion of Multi-component Vesicle Membranes
Yanxiang Zhao,Sovan Das,Qiang Du
Physics , 2009, DOI: 10.1103/PhysRevE.81.041919
Abstract: In this work, we study the adhesion of multi-component vesicle membrane to both flat and curved substrates, based on the conventional Helfrich bending energy for multi-component vesicles and adhesion potentials of different forms. A phase field formulation is used to describe the different components of the vesicle. For the axisymmetric case, a number of representative equilibrium vesicle shapes are computed and some energy diagrams are presented which reveal the dependence of the calculated shapes and solution branches on various parameters including both bending moduli and spontaneous curvatures as well as the adhesion potential constants. Our computation also confirms a recent experimental observation that the adhesion effect may promote phase separation in two-component vesicle membranes.
Non--Equilibrium Transport in Open Quantum Systems via Dynamically Constrained non--Hermitian Boundary Domains
Justin E. Elenewski,Yanxiang Zhao,Hanning Chen
Physics , 2015,
Abstract: The accurate simulation of real--time quantum transport is notoriously difficult, requiring a consistent scheme to treat incoming and outgoing fluxes at the boundary of an open system. We demonstrate a method to converge non--equilibrium steady states using non--Hermitian source and sink potentials alongside the application of dynamic density constraints during wavefunction propagation. This scheme adds negligible cost to existing computational methods while exhibiting exceptional stability and numerical accuracy.
Complex non-Hermitian Potentials and Real-Time Time-Dependent Density Functional Theory: A Master Equation Approach
Justin E. Elenewski,Yanxiang Zhao,Hanning Chen
Physics , 2015,
Abstract: The simulation of quantum transport in a realistic, many-particle system is a nontrivial problem with no quantitatively satisfactory solution. While real-time propagation has the potential to overcome the shortcomings of conventional transport methods, this approach is prone to finite size effects that are associated with modeling an open system on a closed spatial domain. Using a master equation framework, we exploit an equivalence between the superoperators coupling an open system to external particle reservoirs and non-Hermitian terms defined at the periphery of a quantum device. By taking the mean-field limit, the equation of motion for the single-particle reduced density matrix becomes equivalent to real-time time-dependent density functional theory in the presence of imaginary source and sink potentials. This method may be used to converge nonequilibrium steady states for a many-body quantum system using a previously reported constraint algorithm.
Chaos and Control in Coronary Artery System
Yanxiang Shi
Discrete Dynamics in Nature and Society , 2012, DOI: 10.1155/2012/631476
Abstract: Two types of coronary artery system N-type and S-type, are investigated. The threshold conditions for the occurrence of Smale horseshoe chaos are obtained by using Melnikov method. Numerical simulations including phase portraits, potential diagram, homoclinic bifurcation curve diagrams, bifurcation diagrams, and Poincaré maps not only prove the correctness of theoretical analysis but also show the interesting bifurcation diagrams and the more new complex dynamical behaviors. Numerical simulations are used to investigate the nonlinear dynamical characteristics and complexity of the two systems, revealing bifurcation forms and the road leading to chaotic motion. Finally the chaotic states of the two systems are effectively controlled by two control methods: variable feedback control and coupled feedback control.

Zhao Yanxiang,Wang Renhong,

计算数学 , 2006,
Abstract: Spline's exactness is firstly mentioned in 20] by Schoenberg in 1946. In this paper, we further investigate the relationship between the spline'exactness and its span, and construct a special spline with minimal span when its exactness reach the maximum. Then, we consider how to describe the above problem with multivariate mathematical tool when we extend the univariate case to multivariate one so that we can continuously investigate certain multivariate box splines with their exactness and span.
Suppression of Mitochondrial Complex I Influences Cell Metastatic Properties
Xuelian He, Aifen Zhou, Hao Lu, Yong Chen, Guochang Huang, Xin Yue, Peiwei Zhao, Yanxiang Wu
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0061677
Abstract: Despite the fact that mitochondrial dysfunction has an important role in tumorigenesis and metastasis, the underlying mechanism remains to be elucidated. Mitochondrial Complex I (NADH:ubiquinone oxidoreductase) is the first and the largest protein complex of the mitochondrial electron-transport chain (ETC),which has an essential role in maintaining mitochondrial function and integrity. In this study, we separately knocked down two subunits of mitochondrial complex I, GRIM-19 or NDUFS3, and investigated their effects on metastatic behaviors and explored the possible mechanisms. Our data showed that stable down-modulation of GRIM-19 or NDUFS3 decreased complex I activity and reactive oxygen species (ROS) production; led to enhanced cell adhesion, migration, invasion, and spheroid formation; and influenced the expressions of extracellular matrix (ECM) molecules and its related proteins. We also observed that the expressions of GRIM-19, NDUFS3, and ECM elements were correlated with invasive capabilities of breast cancer cell lines. These results suggest that inhibition of complex I affects metastatic properties of cancer cells, and mitochondrial ROS might play a crucial role in these processes by regulating ECM.
Periodic migration in a physical model of cells on micropatterns
Brian A. Camley,Yanxiang Zhao,Bo Li,Herbert Levine,Wouter-Jan Rappel
Quantitative Biology , 2013, DOI: 10.1103/PhysRevLett.111.158102
Abstract: We extend a model for the morphology and dynamics of a crawling eukaryotic cell to describe cells on micropatterned substrates. This model couples cell morphology, adhesion, and cytoskeletal flow in response to active stresses induced by actin and myosin. We propose that protrusive stresses are only generated where the cell adheres, leading to the cell's effective confinement to the pattern. Consistent with experimental results, simulated cells exhibit a broad range of behaviors, including steady motion, turning, bipedal motion, and periodic migration, in which the cell crawls persistently in one direction before reversing periodically. We show that periodic motion emerges naturally from the coupling of cell polarization to cell shape by reducing the model to a simplified one-dimensional form that can be understood analytically.
Study on Co-Opetition in China’s Edible Mushroom Industry: Take Shandong Province as an Example  [PDF]
Min Li, Jilian Hu, Yanxiang Ge
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.91001
Abstract: During the last few years, large-scale enterprises that engage in commercial cultivation of edible mushrooms have been growing at a very fast pace, bringing about new changes to the industrial structure of the edible mushroom industry. Co-existence of large-scale enterprises and small-scale farmers has become the long-term status quo of the edible mushroom industry. How to promote proportional development for these two important industrial bodies has become a pressing issue for the edible mushroom industry in Shandong Province. This paper studies Co-opetition in the edible mushroom industry in Shandong Province, in regard to aspects and effect on industrial competition pattern, motives, benefits, potential challenges and evolution of co-opetition. This paper concludes that by carrying out price insurance on edible mushrooms, developing intermediary organizations and reinforcing government support, co-opetition between the two will become more efficient, which in turn, will promote the evolution to the mode of “balanced co-opetition” and optimize the organization of the edible mushroom industry.
Selective Hybrid Encryption Algorithms for Secure Transmission of Electrical Energy Data
Li Jing,He Yanxiang
Asian Journal of Information Technology , 2012,
Abstract: The encryption algorithms previously proposed usually encrypt every data of electrical energy in order to maintain security and safety. However, the quantity of electrical energy data to be transmitted is very large and a majority of them are encrypted, so the encryption algorithms previously proposed increase the burden of communications and reduce the transmission efficiency. In this study, A Selective Hybrid Encryption Algorithm for secure transmission of electrical energy data is presented. The algorithm is based on SSL (Secure Sockets Layer). It adopts Encryption Algorithm AES (Advanced Encryption Standard) to encrypt important data of electrical energy and uses SHA-1(Secure Hash Algorithm) to get message digest. At the same time, The algorithm make also use of ECC Elliptic Curves Cryptography and AES to transmit data. With the method, the data of electrical energy encrypted can be transmitted highly active and safely.
Effects of strontium and boron interactions in Al-7Si alloys
Chen Xiang,Li Yanxiang
China Foundry , 2010,
Abstract: Effects of boron and strontium combined treatment on the microstructure of hypoeutectic Al-7Si alloy have been studied. Experimental results show that strontium has no significant effect on the grain refinement efficiency of boron and the eutectic silicon modification efficiency is not only related to the strontium content but also related to the boron content in the Al-7Si alloy melt. There is a negative interaction between boron and strontium that results in the formation of a strontium-boron-aluminum containing compound, which reduces the effective strontium level and decreases the eutectic silicon modification efficiency substantially. The refinement and modification mechanisms remain unchanged after the combined addition of strontium and boron. Based on the experimental results, a model for assessing the modification level in the Al-Si alloy melts after combined addition of boron and strontium was presented.
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