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Search Results: 1 - 10 of 55309 matches for " Zhen-Hui He "
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Stochastic resonance in the growth of a tumor induced by correlated noises
Wei-Rong Zhong,Yuan-Zhi Shao,Zhen-Hui He
Physics , 2005,
Abstract: Multiplicative noise is found to divide the growth law of tumors into two parts in a logistic model, which is driven by additive and multiplicative noises simultaneously. The Fokker-Planck equation was also derived to explain the fact that the influence of the intensity of multiplicative noise on the growth of tumor cells has a stochastic resonance-like characteristic. An appropriate intensity of multiplicative noise is benefit to the growth of the tumor cells. The correlation between two sorts of noises weakens the stochastic resonance-like characteristic. Homologous noises promote the growth of the tumor cells.
Noise-induced first-order transition in anti-tumor immunotherapy
Wei-Rong Zhong,Yuan-Zhi Shao,Zhen-Hui He
Physics , 2005,
Abstract: We studied the single-variable dynamics model of the tumor growth. A first-order phase transition induced by an additive noise is shown to reproduce the main features of tumor growth under immune surveillance. The critical average cells population has a power-law function relationship with the immune coefficient.
Influence of Correlated Noises on Growth of a Tumor
Wei-Rong Zhong,Yuan-Zhi Shao,Zhen-Hui He
Physics , 2005,
Abstract: We studied the effect of additive and multiplicative noises on the growth of a tumor based on a logistic growth model. The steady-state probability distribution and the average population of the tumor cells were given to explain the important roles of correlated noises in the tumor growth. We found that multiplicative noise induces a phase transition of the tumor growth from an uni-stable state to a bi-stable state; the relationship between the intensity of multiplicative noise and the population of the tumor cells showed a stochastic resonance-like characteristic. It was also confirmed that additive noise weakened rather than extinguish the tumor growth. Homologous noises, however, promote the growth of a tumor. We also discussed about the relationship between the tumor treatment and the model.
Spatiotemporal Fluctuation Induced Transition in a Tumor Model with Immune Surveillance
Wei-Rong Zhong,Yuan-Zhi Shao,Zhen-Hui He
Physics , 2006, DOI: 10.1103/PhysRevE.74.011916
Abstract: We report on a simple model of spatial extend anti-tumor system with a fluctuation in growth rate, which can undergo a nonequilibrium phase transition. Three states as excited, sub-excited and non-excited states of a tumor are defined to describe its growth. The multiplicative noise is found to be double-face: The positive effect on a non-excited tumor and the negative effect on an excited tumor.
Pure multiplicative stochastic resonance of anti-tumor model with seasonal modulability
Wei-Rong Zhong,Yuan-Zhi Shao,Zhen-Hui He
Quantitative Biology , 2006, DOI: 10.1103/PhysRevE.73.060902
Abstract: The effects of pure multiplicative noise on stochastic resonance in an anti-tumor system modulated by a seasonal external field are investigated by using theoretical analyses of the generalized potential and numerical simulations. For optimally selected values of the multiplicative noise intensity quasi-symmetry of two potential minima and stochastic resonance are observed. Theoretical results and numerical simulations are in good quantitative agreement.
Sensitive predators and endurant preys in an ecosystem driven by correlated noises
Wei-Rong Zhong,Yuan-Zhi Shao,Zhen-Hui He
Quantitative Biology , 2005,
Abstract: We investigate the Volterra ecosystem driven by correlated noises. The competition of the predators induces an increasing in population density of the predators. The competition of the preys, however, leads the predators to decay. The predators may have better stability under strong correlated noises. The predators undergo a sensitivity to a random environment, whereas the preys exhibit a surprising endurance to this stochasticity.
A Diffusion Model of Field-Induced Aggregation in Ferrofluid Film

FANG Wen-Xiao,HE Zhen-Hui,CHEN Di-Hu,ZHAO Yan-E,

中国物理快报 , 2008,
Abstract: By introducing Arrhenius behaviour to the ferroparticles on the surface of the aggregated columnar structure in a diffusion model, equilibrium equations are set up. The solution of the equations shows that to keep the aggregated structures stable, a characteristic field is needed. The aggregation is enhanced by magnetic fields, yet suppressed as the temperature increases. Analysing the influence of the magnetic field on the interaction energy between the dipolar particles, we estimate the portion of the diffusing particles, and provide the agreeable ratio of the column radius over the centre-to-centre spacing between columns in a hexagonal columnar structure formed under a perpendicular magnetic field.
Spatiotemporal Noise Triggering Infiltrative Tumor Growth under Immune Surveillance
Wei-Rong Zhong,Yuan-Zhi Shao,Li Li,Feng-Hua Wang,Zhen-Hui He
Quantitative Biology , 2008, DOI: 10.1209/0295-5075/82/20003
Abstract: A spatiotemporal noise is assumed to reflect the environmental fluctuation in a spatially extended tumor system. We introduce firstly the structure factor to reveal the invasive tumor growth quantitatively. The homogenous environment can lead to an expansive growth of the tumor cells, while the inhomogenous environment underlies an infiltrative growth. The different responses of above two cases are separated by a characteristic critical intensity of the spatiotemporal noise. Theoretical and numerical results present a close annotation to the clinical images.
Noise Correlation Induced Synchronization in a Mutualism Ecosystem
Wei-Rong Zhong,Yuan-Zhi Shao,Zhen-Hui He,Meng-Jie Bie,Dan Huang
Quantitative Biology , 2007,
Abstract: Understanding the cause of the synchronization of population evolution is an important issue for ecological improvement. Here we present a Lotka-Volterra-type model driven by two correlated environmental noises and show, via theoretical analysis and direct simulation, that noise correlation can induce a synchronization of the mutualists. The time series of mutual species exhibit a chaotic-like fluctuation, which is independent to the noise correlation, however, the chaotic fluctuation of mutual species ratio decreases with the noise correlation. A quantitative parameter defined for characterizing chaotic fluctuation provides a good approach to measure when the complete synchronization happens.


物理学报 , 1989,
Abstract: The measurements of X-ray diffraction, d.c. resistance versus temperature and Hall coefficients at low temperature have been performed for YBa2Cu3-xMxOy systems. (x = 0.00, 0.025,0.05,0.075,0.10,0.125,0.15,0.20,0.25,0.275,0.30,0.325,0.35,0.375,0.40 for M = Co; x=0.025,0.05,0.075,0.10,0.15,0.20,0.30 for M = Zn)The crystallographic data show that an orthorhombic-tetragonal phase transition takes place as Co content increases,while the crystal structure exhibit drastic changes with Zn content. The measurement of resistances indicates that a metal-semiconductor transition occurs at certain x for Co dopant hut not found for Zn dopant. The hole carrier concentration raduces with Co content monotoneous-iy but varies nonmonotoneously with Zn content, giving a maximum at about x= 0.15 The concepts of localization and acceptor are used to explain these phenomena. The suppression of Tc for both systems is discussed with various possible suppression mechanisms.
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