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Denitrification in Chongming east tidal flat sediment, Yangtze estuary, China

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science China Earth sciences 2006年第10期49卷 1090-1097页

作者： WANG Dongqi1,2. CHEN Zhenlou1,3. XU Shiyuan1,2. HU Lingzhen1 & WANG Jun1,2.1. College of Resources & Environment, east China {2. univer{3., shanghai 2.0062. China 2. State Key Laboratory of Estuarine and Coastal Sediment Dynamics and Morphodynamics, east China {2. univer{3., shanghai 2.0062. China 3. Key Laboratory of Geographical information {13. of Ministry of Education,east China {2. univer{3.,shanghai 2.0062. China 1. College of Resources & Environment East China Normal University Shanghai 200062 China 2. State Key Laboratory of Estuarine and Coastal Sediment Dynamics and Morphodynamics East China Normal University Shanghai 200062 China 3. Key Laboratory of Geographical information {2. of Ministry of Education East China Normal University Shanghai 200062 China

From July 2.03.to July 2.04, samples were collected on Chongming Island east tidal flat every two months. The research showed that the nitrous oxide (N2.) production rate was very low in the water, Chongming east tidal flat (CM) sediment was the N2. source of the water. Sediment N2. natural production rate was between -0.08 and 1.74 μmolN·m-2.h-1. N2. natural production rate was higher in the summer. The difference of the N2. natural production rate in the different tidal flats, the correlation between the N2. natural production rate and the denitrification rate, and those with the temperature and DO indicate that middle tidal flat sediment denitrification was the main process of the N2. production, while in the low tidal flat sediment, the production of the N2. came from several processes of the nitrogen cycling. Tidal flat sediment denitrification reaction was stronger in summer and winter but relatively lower in the late autumn and early spring. Seasonal change of the sediment denitrification rate was wide, from 1.12.to 3..3. μmolN·m-2.h-1. Temperature, DO and the coactions of them had the prominent effect on the tidal flat sediment denitrification.

关键词： Yangtze estuary, tidal flat sediment, denitrification, nitrous oxide, effect factor.

Seamlet carving for shape-aware image resizing

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science China(information sciences) 2012年第5期55卷 1073-1081页

作者： LIN Xiao 1,2.SHENG Bin 1,MA LiZhuang 1,SHEN Yang 1 & CHEN ZhiHua 3.1 department of Computer {2. and Engineering,shanghai Jiao Tong {3.sity,shanghai 2.02.0,China 2.Academy of information technology,Luoyang normal {3.sity,Luoyang 47102.,China 3.department of Computer {2. and Engineering,{13. China {3.sity of {2. and technology,shanghai 2.02.0},China 1. department of Computer science and Engineering Shanghai Jiao Tong University Shanghai 200240 China2. Academy of Information Technology Luoyang Normal University Luoyang 471022 China3. Department of Computer Science and Engineering East China University of Science and Technology Shanghai 200237 China

In this paper we propose an optimized seam-carving approach for anti-shearing image *** image/video seam-carving strategy only focuses on deleting the pixels along 8-connected seams,which may lead to the obvious information loss during *** the traditional seam-carving methods,our approach can construct a seamlet to handle the discontinuous pixels and further achieve an optimized image resizing results with *** particular,to suppress zigzag artifacts,we introduce the anti-shearing energy into the seamlet generation,which includes two steps:1) the energy map is formalized by using Gabor filtering and the saliency map;2. The energy computation is optimized in Gabor feature space to obtain the resizing results without the connectivity *** experimental results and comparisons show the effectiveness of our method.

关键词： image resizing seamlet carving saliency map

An improved approach to the efficient construction of and search operations in motion graphs

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science China(information sciences) 2012年第5期55卷 1042-1051页

作者： GAO Yan 1,CHEN ZhiHua 2.CHEN MinGang 3.& SHEN Yang 3.1 Software Engineering Institute,{2. China normal univer{3.,shanghai 2.0062.China 2.department of Computer science and Engineering,{2. China univer{3. of science and technology,shanghai 2.02.0},China 3.department of Computer science and Engineering,shanghai Jiao Tong univer{3.,shanghai 2.02.0,China 1. Software Engineering Institute East China Normal University Shanghai 200062 China2. Department of Computer Science and Engineering East China University of Science and Technology Shanghai 200237 China3. Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

Motion graphs have been widely used as an effective technique in the synthesis of human *** synthesize well-formed motions,motion graphs require smooth transitions and good ***,the time and costs grow quadratically as the graph size *** this paper,we present a method to set up a hierarchical structure,called a structure *** coarse level of this graph models different motion categories and their transitions,and the fine level mainly captures different motion *** interpolation space method is used to improve the graph connectivity at the fine *** structure guides the establishment of a faster and more realistic graphical *** the building process,this structure also helps with searching the motion graph,by performing a traverse search and placing the findings into a direct look-up table or local search ***,when there is no direct link between the different motions,a navigation map is introduced to conduct an appropriate search path via a series of transition motion *** experimental results indicate that our approach could lower the computation time in construction and searching,while simultaneously providing a richer variety of motion styles.

关键词： motion graph structure table registration curve motion interpolation

A computational investigation of boron-doped chromium and chromium clusters by density functional theory

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science China(Physics,Mechanics & Astronomy) 2010年第5期53卷 812-817页

作者： GE GuiXian1,JING Qun1 & LUO YouHua2.3.1 Key Laboratory of Ecophysics and department of Physics,{2. College,Shihezi univer{3.,Xinjiang 83.003.China 2.school of science,east China univer{3. of science and technology,shanghai 2.02.0},China 3.Institute of Theoretical Physics,school of Physics and {13. Optoelectronics,Henan univer{3.,Kaifeng 475004,China 1. Key Laboratory of Ecophysics and department of Physics Normal College Shihezi University Xinjiang 832003 China2. School of Science East China University of Science and Technology Shanghai 200237 China3. Institute of Theoretical Physics School of Physics and Information Optoelectronics Henan University Kaifeng 475004 China

The geometries,stabilities and electronic properties of Crn and CrnB(n=2.9) clusters have been systematically investigated by density functional *** results suggest that the lowest energy structures for CrnB clusters can be obtained by substituting one Cr atom in Crn+1 clusters with B *** geometries of CrnB clusters are similar to that of Crn+1 clusters except for local structural *** second-order difference and fragmentation energy show Cr4,Cr6,Cr8,Cr3.,Cr5B and Cr8B cluster are the most stable among these studied *** impurity B increases the stabilities of chromium *** B is doped on the Crn clusters,cluster geometry does dominate positive role in enhancing their *** doped B atom does not change the coupling way of the Cr site in Crn clusters,but breaks the symmetry and the Cr atoms are no longer *** doped B atom increases the total magnetic moments of Crn in most cases.

关键词： Crn and CrnB clusters geometries electronic properties

Short cycle structures for graphs on surfaces and an open problem of Mohar and Thomassen

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science China Mathematics 2006年第2期49卷 212-224页

作者： REN Han & DENG Mo department of Mathematics, east China {2. {3.sity, shanghai 2.0062. China College of Mathematics & information science, Northwest {2. {3.sity, Lanzhou 73.070, China 1. department of Mathematics East China Normal University Shanghai 200062 China 2. College of Mathematics & information science Northwest Normal University Lanzhou 730070 China

In this paper we investigate cycle base structures of a (weighted) graph and show that much information of short cycles is contained in an MCB (i.e., minimum cycle base). After setting up a Hall type theorem for base-transformation, we give a sufficient and necessary condition for a cycle base to be an MCB. Furthermore, we show that the structure of MCB in a (weighted)graph is unique. The property is also true for those having a longest length (although much work has been down in evaluating MCB, little is known for those having a longest length). We use those methods to find out some unknown properties for short cycles sharing particular properties in (unweighted) graphs. As applications, we determine the structures of short cycles in an embedded graph and show that there exist polynomially bounded algorithms in finding a shortest contractible cycle and a shortest two-sided cycle provided such cycles exist. Those answer an open problem of B. Mohar and C. Thomassen.

关键词： cycle base facial cycle graph embedding.

Efficient video cutout based on adaptive multilevel banded method

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science China(information sciences) 2012年第5期55卷 1082-1092页

作者： CHEN MinGang 1,SUI BoCong 1,GAO Yan 2.& MA LiZhuang 1 1 department of Computer science and Engineering,{2. Jiao Tong {3.sity,{2. 2.02.0,China 2.Software Engineering Institute,east China normal {3.sity,{2. 2.0062.China 1. department of Computer science and Engineering Shanghai Jiao Tong University Shanghai 200240 China2. Software Engineering Institute East China Normal University Shanghai 200062 China

Although many efficient image cutout approaches have been proposed,it is still a challenge to cut out foreground objects from a video clip because of the costs of time and memory consumption and the difficulty in maintaining temporal coherence for the cutout *** this paper,we propose a novel and efficient video cutout approach by extending a multilevel banded image segmentation method to video *** our method,the segmentation results are propagated frame by frame at the lowest resolution level based on optical flow,and are refined in image pyramids level by level through banded graph *** construct an adaptive narrow band to ensure that the segmentation result falls exactly into the narrow band during *** results show that the video cutout approach based on adaptive multilevel bands dramatically reduces time and memory costs,and achieves ideal segmentation results.

关键词： video object cutout multilevel band graph cuts video segmentation

Gradient Estimates for a Nonlinear Heat Equation on Compact Riemannian Manifold

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Journal of Mathematical Research with Applications 2012年第6期32卷 743-753页

作者： Xinrong JIANG1,2. , Caisheng LIAO2.. Institute of Mathematics and information science, Jiangxi {2. {3.sity,Jiangxi 3.002., P. R. China 2. department of Mathematics, east China {2. {3.sity, shanghai 2.02.1, P. R. China Institute of Mathematics and information science Jiangxi Normal University Jiangxi 330022 department of Mathematics East China Normal University Shanghai 200241

In this paper, we study gradient estimates for the nonlinear heat equation ut △u =au log u, on compact Riemannian manifold with or without boundary. We get a Hamilton type gradient estimate for the positive smooth solution to the equation on close manifold, and obtain a Li-Yau type gradient estimate for the positive smooth solution to the equation on compact manifold with nonconvex boundary.

关键词： nonlinear heat equation Riemannian manifold gradient estimates.

Proper holomorphic self-maps of smooth bounded Reinhardt domains in C^2

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science China Mathematics 2008年第1期51卷 93-100页

作者： CHEN ZhiHua~1 & PAN YiFei~(2.3.) 1 department of Mathematics, Tongji {2.sity, {3. 2.0092. China 2.department of Mathematical sciences, Indiana {2.sity-Purdue {2.sity Fort Wayne, Fort Wayne, IN 46805-1499, USA 3.{12. of Mathematics and information sciences, Jiangxi {13. {2.sity, Nanchang 3.002., China department of Mathematics Tongji University Shanghai China department of Mathematical sciences Indiana University-Purdue University Fort Wayne Fort Wayne USA school of Mathematics and information {2.s Jiangxi Normal University Nanchang China

It is proved that every proper holomorphic self-map of a smooth bounded Reinhardt domain in C^2.is an automorphism.

关键词： Reinhardt domain proper holomorphic maps

p-th moment exponential stability of stochastic differential equations with impulse effect

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science China(information sciences) 2011年第8期54卷 1702-1711页

作者： SHEN LiJuan 1,2.& SUN JiTao 11 department of Mathematics, Tongji univer{2.,{3. 2.0092.China 2.department of Mathematics,Luoyang normal univer{2., Luoyang 47102.,China 1. department of Mathematics Tongji University Shanghai 200092 China2. Department of Mathematics Luoyang Normal University Luoyang 471022 China

The p-th moment exponential stability of stochastic differential equations with impulse effect is *** employing the method of vector Lyapunov functions,some sufficient conditions for the p-th moment exponential stability are *** addition,the usual restriction of the growth rate of Lyapunov function is replaced by the condition of the drift and diffusion coefficients to study the p-th moment exponential *** examples are also discussed to illustrate the effectiremess of the results obtained.

关键词： stochastic differential equations impulse p-th moment exponential stability vector Lyapunov functions