Time filter

Source Type

Wang Q.,Inner Mongolia Finance and Economics College | Perc M.,University of Maribor | Chen G.,City University of Hong Kong
Physica A: Statistical Mechanics and its Applications | Year: 2010

We study synchronization transitions and pattern formation on small-world networks consisting of Morris-Lecar excitable neurons in dependence on the information transmission delay and the rewiring probability. In addition, networks formed via gap junctional connections and coupling via chemical synapses are considered separately. For gap-junctionally coupled networks we show that short delays can induce zigzag fronts of excitations, whereas long delays can further detriment synchronization due to a dynamic clustering anti-phase synchronization transition. For the synaptically coupled networks, on the other hand, we find that the clustering anti-phase synchronization can appear as a direct consequence of the prolongation of information transmission delay, without being accompanied by zigzag excitatory fronts. Irrespective of the coupling type, however, we show that an appropriate small-world topology can always restore synchronized activity if only the information transmission delays are short or moderate at most. Long information transmission delays always evoke anti-phase synchronization and clustering, in which case the fine-tuning of the network topology fails to restore the synchronization of neuronal activity. © 2010 Elsevier B.V. All rights reserved.


Wang Q.Y.,Inner Mongolia Finance and Economics College | Wang Q.Y.,Beihang University | Lu Q.S.,Beihang University | Duan Z.S.,Peking University
International Journal of Non-Linear Mechanics | Year: 2010

Lag synchronization in unidirectionally coupled chaotic systems is investigated in this paper. Based on the invariance principle of differential equations, a new adaptive delay feedback scheme is proposed to realize the lag synchronization effectively in the coupled chaotic systems. As an example, numerical simulations for the coupled Hindmarsh-Rose (HR) neuron models are conducted, which is in good agreement with the theoretical analysis. More interestingly, it is found that there is a fine U-shaped structure in the lag synchronization curve for the HR neuron model. Furthermore, lag synchronization and the corresponding U-shaped structure are robust against the small mismatch of parameters and noisy disturbances. © 2009 Elsevier Ltd. All rights reserved.


Gan C.,Zhejiang University | Wang Q.,Inner Mongolia Finance and Economics College | Perc M.,University of Maribor
Journal of Physics A: Mathematical and Theoretical | Year: 2010

Strictly, the KAM torus no longer exists for a randomly driven Hamiltonian system. We firstly investigate the process of torus breakdown in the randomly driven Morse oscillator by transforming the original system into another one in action-angle variables and introducing the specific Poincaré map by Makarov et al. Though the strength of random perturbations is large, some thick closed-like curves can still appear. To characterize these noisy dynamics, the pseudo-periodic surrogate approach, along with the algorithm on the mean divergence, is applied to evaluate the correlation dimensions of the original data and their corresponding surrogates. Two kinds of noisy dynamics are picked out from the randomly driven Morse oscillator. © 2010 IOP Publishing Ltd.


Gan C.-B.,Zhejiang University | Perc M.,University of Maribor | Wang Q.-Y.,Beihang University | Wang Q.-Y.,Inner Mongolia Finance and Economics College
Chinese Physics B | Year: 2010

The stochastic resonance in paced time-delayed scale-free FitzHugh-Nagumo (FHN) neuronal networks is investigated. We show that an intermediate intensity of additive noise is able to optimally assist the pacemaker in imposing its rhythm on the whole ensemble. Furthermore, we reveal that appropriately tuned delays can induce stochastic multiresonances, appearing at every integer multiple of the pacemaker's oscillation period. We conclude that fine-tuned delay lengths and locally acting pacemakers are vital for ensuring optimal conditions for stochastic resonance on complex neuronal networks. © 2010 Chinese Physical Society and IOP Publishing Ltd.


Xu Y.,Beihang University | Xu Y.,Inner Mongolia Finance and Economics College | Huang H.-J.,Beihang University
Physica A: Statistical Mechanics and its Applications | Year: 2012

A modified floor field model is proposed to simulate the pedestrian evacuation behavior in a room with multiple exits by considering the direction visual field. Direction visual field is used to describe the pedestrian's prediction on the propagation of pedestrian flow along some directions. The proposed model outperforms most of the similar models developed so far in such scenario that pedestrians are initially distributed in a room's specified zone. Simulation results show that the consideration of direction visual field can better reproduce the evacuation process and reduce evacuation time apparently. Sensitivity analyses of the model parameters are presented. © 2011 Elsevier B.V. All rights reserved.


Su J.,Inner Mongolia University | Jian Y.,Inner Mongolia University | Chang L.,Inner Mongolia University | Chang L.,Inner Mongolia Finance and Economics College
International Journal of Heat and Mass Transfer | Year: 2012

This study investigates the velocity and temperature distributions of the thermally fully developed electroosmotic flow through a rectangular microchannel. Based on linearized Poisson-Boltzmann (PB) equation, Navier-Stokes equation and thermally fully developed energy equation, analytical solutions of normalized velocity, temperature and Nusselt number are derived. They greatly depend on the ratio K of characteristic scale of the rectangular microchannel to Debye length, width to height ratio α and Joule heating to heat flux ratio S. By numerical computation, we found that for prescribed electrokinetic width K, increased S yields greater temperature. For small K, the variations of the temperature θ are larger than those of large K. The dependence of temperature on S is more significant for a small K, while at a larger K the temperature profiles are almost identical. In addition, we illustrate the Nusselt number Nu variations with S, α and K. © 2012 Elsevier Ltd. All rights reserved.


Shao Y.-L.,Inner Mongolia Finance and Economics College
Applied Mechanics and Materials | Year: 2012

The exhaust noise, which falls into low-frequency noise, is the dominant noise source of a diesel engines and tractors. The traditional exhaust silencers, which are normally constructed by combination of expansion chamber, and perforated pipe or perforated board, are with high exhaust resistance, but poor noise reduction especially for the low-frequency band noise. For this reason, a new theory of exhaust muffler of diesel engine based on counter-phase counteracts has been proposed. The mathematical model and the corresponding experimental validation for the new exhaust muffler based on this theory were performed. © (2012) Trans Tech Publications, Switzerland.


Shao Y.-L.,Inner Mongolia Finance and Economics College
Advanced Materials Research | Year: 2014

The exhaust noise, which falls into low-frequency noise, is the dominant noise source of a diesel engines and tractors. The traditional exhaust silencers, which are normally constructed by combination of expansion chamber, and perforated pipe or perforated board, are with high exhaust resistance, but poor noise reduction especially for the low-frequency band noise. For this reason, a new theory of exhaust muffler of diesel engine based on counter-phase counteracts has been proposed. The mathematical model and the corresponding experimental validation for the new exhaust muffler based on this theory were performed. © (2014) Trans Tech Publications, Switzerland.


Shao Y.-L.,Inner Mongolia Finance and Economics College
Procedia Engineering | Year: 2011

A conventional muffler of internal combustion engine is mostly constructed as a mixture or combination of perforated ducts, baffle or perforated baffle, expansion chamber, etc., and the noise reduction is limited and backpressure is high hence the fuel efficiency is low. In order to solve the problems of traditional exhaust silencers with poor characteristics of noise reduction in low-frequency range and high exhaust resistance, a new theory of exhaust silencer of diesel engine based on counter-phase counteract and split-gas rushing has been proposed. Taking the single-cylinder diesel engine CG25 as the experimental engine, the author measured the exhaust noise and its spectra. By comparing the results of the new types of mufflers to those without a muffler and those with the original muffler of the engine, the new theory of muffler has been verified. © 2011 Published by Elsevier Ltd.


Shao Y.-L.,Inner Mongolia Finance and Economics College
2011 International Conference on Electronics, Communications and Control, ICECC 2011 - Proceedings | Year: 2011

The traditional exhaust muffler, which is with high exhaust resistance, high power loss and high fuel consumption, is normally constructed by the combination of a perforated tube, a perforated plate and an expanded chamber. In this paper, a new concept of an exhaust muffler for a diesel engine based on out-of-phase cancellation which results in low backpressure proposed. The principle of the new muffler is demonstrated in the experiments conducted on a single-cylinder diesel engine. © 2011 IEEE.

Loading Inner Mongolia Finance and Economics College collaborators
Loading Inner Mongolia Finance and Economics College collaborators