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System Size Resonance Associated with Canard Phenomenon in a Biological Cell System

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Chinese Journal of Chemical Physics 2008年第6期21卷 521-525页

作者： Juan Ma Hong-ying Li Zhong-huai hou hou-wen xin Department of Chemical Physics University of Science and Technology of China Hefei 230026 China Hefei National Lab of Physical Science at Microscale University of Science and TechnoloEy of China Hefei 230026 China Department of Chemistry Hefei Teachers College Hefei 230000 China

The influence of internal noise on the calcium oscillations is studied. It is found that stochastic calcium oscillations occur when the internal noise is considered, while the corresponding deterministic dynamics only yields a steady state. Also,. the performance of such oscillations shows two maxima with the variation of the system size, indicating the occurrence of system size resonance. This behavior is found to be intimately connected with the canard phenomenon. Interestingly, it is also found that one of the optimal system sizes matches well with the real cell size, and such a match is robust to the variation of the control parameters.

关键词： Internal noise Calcium oscillations System size resonance Canard phenomenon

Two-Parameter Stochastic Resonance in a Model of Electrodissolution of Fe in H_2SO_4

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Chinese Chemical Letters 2001年第3期12卷 223-226页

作者： Zong xin PI hou Wen xin Department of Chemical Physics University of Science and Technology of ChinaHefei 230026

Stochastic resonance (SR) is shown in a two-parameter system, a model of electrodissolution of Fe in H2SO4. Modulation of two different parameters by a periodic signal in one parameter and noise in the other parameter is found to give rise to SR. The result indicates that the noise can enlarge a weak periodic signal and lead the system to order. novel aspects of SR in this system are discussed.

关键词： Noise signal stochastic resonance

Canard explosion and internal signal stochastic bi-resonance in the CO oxidation on platinum surface

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Science China Chemistry 2006年第2期49卷 133-139页

作者： ZHAO Gang hou Zhonghuai xin houwen Department of Chemical Physics University of Science and Technology of China Hefei 230026 China Department of Chemical Physics University of Science and Technology of China Hefei 230026 China Department of Chemical Physics University of Science and Technology of China Hefei 230026 China

Canard explosion is a kind of complex temporal behavior and is ubiquitous in excitable systems. It is associated with an abrupt change of amplitude and period of an oscillatory trajectory in a very narrow interval of a control parameter. We have analyzed in the present paper the behavior of canard explosion that is near a supercritical Hopf bifurcation and its response to white noise in a temporal model of CO oxidation on platinum surface. We have found that the presence of canard explosion gives rise to internal signal stochastic bi-resonance, thus demonstrating a novel functional feature of noise: selective amplifying signals with different periods.

关键词： internal signal stochastic bi-resonance, canard explosion, CO oxidation on platinum surface, excitable system, nullcline.

Internal signal stochastic resonance of a synthetic gene network

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Science China Chemistry 2005年第3期48卷 189-194页

作者： WANG Zhiwei hou Zhonghuai xin houwen Department of Chemical Physics University of Science and Technology of China Hefei 230026 China Department of Chemical Physics University of Science and Technology of China Hefei 230026 China Department of Chemical Physics University of Science and Technology of China Hefei 230026 China

The dynamics behavior of a synthetic gene network controlled by random noise is investigated using a model proposed recently. The phenomena of noise induced oscillation (NIO) of the protein concentrations and internal signal stochastic resonance (SR) are studied by com-puter simulation. We also find that there exists an optimal noise intensity that can most favor the occurrence of effective oscillation (EO). Finally we discuss the potential constructive roles of SR on gene expression systems.

关键词： noise, noise-induced oscillation, stochastic resonance, gene expression, synthetic gene network.

Catalytic Oscillatory Oxidation of CO on Pt(110): on-off Control to Chaos

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Chinese Physics Letters 1998年第9期15卷 695-696页

作者： YANG Ling-fa hou Zhong-huai xin hou-wen Department of Chemical Physics University of Science and Technology of ChinaHefei 230026

An improved mean-field model,which specially takes into account pair correlation,was proposed to describe catalytic oscillatory oxidation of CO on Pt(110).By applying on-off control strategies under different frequency,the chemical oscillator shows an abundance of periodic doubling processes,even chaos response,and the route to the chaos and out of the chaos were both identified as period-doubling through analysis of its Lyapunov exponent *** response results reveal that structure delay effect plays an important role to the complexity of this system.

关键词： spectrum. chaos doubling

Maximal Subgroups in the Classical Groups Normalizing Solvable Subgroups

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Algebra Colloquium 2021年第2期28卷 181-194页

作者： xin hou Shangzhi Li Yucheng Yang Jiping Zhang Capital Normal University Beijing 100048China School of Mathematics and Systems Science Beihang University Beijing 100191China 不详

Let G be a classical group over an arbitrary field F,acting on an n-dimensional F-space V=V(n,F).All those maximal subgroups of G are classified each of which normalizes a solvable subgroup N of GL(V/F)not lying in F^... 详细信息

关键词： classical group over arbitrary field maximal subgroup solvable subgroup

Stochastic Multiresonance Induced by an Optimal Noise Pulse Interval Due to Hopping of Energy Levels

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Chinese Physics Letters 2001年第7期18卷 870-873页

作者： ZHANG Ji-Qian xin hou-Wen Department of Chemical Physics University of Science and Technology of ChinaHefei 230026

An interesting phenomenon,called the Stochastic multiresonance(SMR),induced by the variation of the noise pulse interval,is described and the formative mechanism of SMR is investigated by using the concept of hopping between different energy ***,the SMR can be realized by choosing the optimal noise pulse interval or selecting the appropriate noise intensity.

关键词： resonance SMR Optimal

Improving Nonlocal Means Method via a No-reference Image Content Metric for MRI Denoising

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Chinese Journal of Electronics 2014年第4期23卷 735-741页

作者： hou xin LI Jianwu LU Yao DONG Zhengchao Beijing Key Laboratory of Intelligent Information Technology School of Computer Science and TechnologyBeijing Institute of Technology Brain Imaging Lab Columbia University

The patch matching of the traditional Nonlocal means(NLM) filter mainly depends on structure similarity and cannot adapt to the patch rotation or mirroring transformation. Therefore, designing a measure with rotationally invariant similarity is of significant importance for improving the effectiveness of patch comparison of NLM. This paper proposes to apply a no-reference image content metric with the rotation-invariance to NLM for denoising Magnetic resonance(MR) images. The metric measures quantitatively the content of a patch in an image, including sharpness, contrast, and geometric features such as textures and edges. The metric values for every patch are computed and added into the Gaussian matching kernel of NLM so as to effectively perform patch matching. The main advantage of the proposed method is that it does not need to rotate patches in different orientations during patch matching. Experimental results show that the proposed method is superior to the traditional NLM, the state-of-the-art method Block-matching and 3-D(BM3D) filtering and the Unbiased NLM(UNLM) for MRI denoising.

关键词： Nonlocal means Rotationally invariant similarity measure No-reference image content metric Magnetic resonance image denoising

Reponses of middle atmospheric circulation to the 2009 major sudden stratospheric warming

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Earth and Planetary Physics 2020年第5期4卷 472-478页

作者： ShengYang Gu xin hou JiaHui Qi KeMin TengChen XianKang Dou School of Electronic Information Wuhan UniversityWuhan 430072China

In this research, the roles of gravity waves and planetary waves in the change to middle atmospheric residual circulation duringa sudden stratospheric warming period are differentiated and depicted separately by adopting the downward control principle. Ouranalysis shows clear anomalous poleward residual circulation patterns from the equator to high latitudes in the lower winterstratosphere. At the same time, upward mean flows are identified at high latitudes of the winter upper stratosphere and mesosphere,which turn equatorward in the mesosphere and reach as far as the tropical region, and consequently the extratropical region in thesummer hemisphere. The downward control principle shows that anomalous mesospheric residual circulation patterns, includinginterhemispheric coupling, are solely caused by the change in gravity wave forcing resulting from the reversal of the winter stratosphericzonal wind. Nevertheless, both planetary waves and gravity waves are important to variations in the winter stratospheric circulation, butwith opposite effects.

关键词： sudden stratospheric warming residual circulation gravity and planetary waves