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A Note on Z_3 -Connected Graphs with Degree Sum Condition

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Acta Mathematica Sinica,English Series 2012年第11期28卷 2161-2168页

作者： xin Min hou Department of Mathematics University of Science and Technology of China

A graph G satisfies the Ore-condition if d（x）＋d（y） ≥ ｜V（G）｜ for any xy E（G）. Luo et al. [European J. Combin., 2008] characterized the simple Z3-connected graphs satisfying the Ore-condition. In this paper, we characterize the simple Z3-connected graphs G satisfying d（x）＋d（y） ≥ ｜V（G）｜ - 1 for any xy E（G）, which improves the results of Luo et al.

关键词： Group connectivity degree sum condition

On the study of nonlinear dynamics of complex chemical reaction systems

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Science China Chemistry 2006年第1期49卷 1-11页

作者： xin houwen hou Zhonghuai 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

With ever-increasing attentions being paid to complex systems such as the life system, soft matter, and nano-systems, theoretical studies of non-equilibrium nonlinear problems involved in chemical dynamics are now of general interest. In this mini-review, we mainly give a brief introduction to some frontier topics in this field, namely, nonlinear state-state dynamics, nonlinear chemical dynamics on complex networks, and nonlinear dynamics in mesoscopic chemical reaction systems. Deep study of these topics will make great contribution to discovering new laws of chemical dynamics, to exploring new control methods of complex chemical processes, to figuring out the very roles of chemical proc-esses in the life system, and to crosslinking the scientific study of chemistry, physics and biology.

关键词： complex chemical reaction systems, nonlinear dynamics.

Codegree Threshold for Tiling k-graphs with Two Edges Sharing Exactly l Vertices

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Acta Mathematica Sinica,English Series 2020年第1期36卷 13-20页

作者： Lei YU xin Min hou Key Laboratory of Wu Wen-Tsun Mathematics School of Mathematical Sciences University of Science and Technology of China

Given integer k and a k-graph F,let t(k-1)(n,F)be the minimum integer t such that every k-graph H on n vertices with codegree at least t contains an *** integers k>3 and 0≤l≤k-1,let y(k,l)be a k-graph with two edges that shares exactly l *** and Zhao(*** Ser.A,(2015))asked the following question:For all k≥3,0≤l≤k-1 and sufficiently large n divisible by 2 k-l,determine the exact value of t_(k-1)(n,y(k,l)).In this paper,we show that t(k-1)(n,y(k,l))=n/(2 k-l)for k>3 and 1≤l≤k-2,combining with two previously known results of R?dl,Rucinski and Szemeredi(*** Ser.A,(2009))and Gao,Han and Zhao(Combinatorics,Probability and Computing,(2019)),the question of Han and Zhao is solved completely.

关键词： Hypergraph codegree factor

Preparation and photo-catalytic activity of TiO_2-coated medical stone-based porous ceramics

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International Journal of Minerals,Metallurgy and Materials 2013年第6期20卷 593-597页

作者： Ru-qin Gao xin-mei hou School of Environmental and Municipal Engineering North China University of Water Resources and Electric Power School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

Medical stone-based porous ceramics as a carrier were prepared by ultra-fine grinding and low-temperature sintering method. Nano-TiO~ thin films were loaded on the carrier by chemical liquid deposition method using titanium tetrachloride as a precursor. The micro-morphology and microstructure of the synthesized samples were characterized using X-ray diffraction, scanning electron microscopy with energy dispersive spectrometry, and mercury injection method. The photo-catalytic activity of the TiO2 thin films was investigated by degrading formaldehyde. The main crystalline phase in the TiO2 thin films calcined at 550~C is anatase with the average particle size about 10 nm. The specific surface area of the carrier-coated nano-TiO2 increases from 3.68 to 5.32 m2/g. The formaldehyde removal rate of the TiO2/medical stone-based porous ceramics irradiated under an ultraviolet lamp for 120 min reaches 85.6%.

关键词： porous materials ceramics medical stone titanium dioxide thin films formaldehyde photocatalysis

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

Reaction mechanisms for 0.5Li_2MnO_3 ·0.5LiMn_(0.5)Ni_(0.5)O_2 precursor prepared by low-heating solid state reaction

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International Journal of Minerals,Metallurgy and Materials 2012年第9期19卷 856-862页

作者： Dong Li Fang Lian xin-mei hou Kuo-chih Chou School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Department of Physical Chemisitry University of Science and Technology Beijing Beijing 100083 China

Lithium-excess manganese layered oxides, which are commonly described in chemical formula 0.5Li2MnO3·0.5LiMn0.5Ni0.5O2, were prepared by low-heating solid state reaction. The reaction mechanisms of synthesizing precursors, the decomposition mechanism, and intermediate materials in calcination were investigated by means of Fourier transform infrared spectroscopy （FT-IR）, X-ray diffraction （XRD）, field emission scanning electron microscopy （FESEM）, thermogravimetric analysis （TGA）, and differential scanning calorimetry （DSC）. The major diffraction patterns of 0.5Li2MnO3·0.5LiMn0.5Ni0.5O2 powder calcinated at 720℃ for 15 h are indexed to the hexagonal structure with a space group of R3m, and the clear splits of doublets at （006）/（102） and （108）/（110） indicate that the sample adopts a well-layered structure. FESEM images show that the size of the agglomerated particles of the sample ranges from 100 to 300 nm.

关键词： lithium batteries electrode manganese oxide solid state reactions calcination