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Dominant point detecting based non-uniform B-spline approximation for grain contour

science china(Technological sciences) 2007年第1期50卷 90-96页

作者： ZHAO XiuYang1, YIN YanSheng1,2 & YANG Bo3.1 Shandong key laboratory of Engineering Ceramics, Shandong university, Jinan 250061,{3. 2 School of Materials, Ocean university of{3., Qingdao 266003.{3. 3.State key laboratory of Advanced technology for Materials Synthesis and Processing, wuhan university of science and technology, wuhan 43.070,{3. 1. Shandong key laboratory of Engineering Ceramics Shandong University Jinan 250061 China 2. School of Materials Ocean University of China Qingdao 266003 China 3. State key laboratory of Advanced technology for Materials Synthesis and Processing Wuhan University of Science and Technology Wuhan 430070 China

Three-dimension reconstruction from serial sections has been used in the last decade to obtain information concerning three-dimensional microstructural ge-ometry. One of the crucial steps of three-dimension reconstruction is getting compact and fairing grain contours. Based on the achievement of closed raw con-tours of ceramic composite grains by using wavelet and level set, an adaptive method is adopted for the polygonal approximation of the digitized raw contours. Instead of setting a fixed length of support region in advance, the novel method computes the suitable length of support region for each point to find the best es-timated curvature. The dominant points are identified as the points with local maximum estimated curvatures. Periodic closed B-spline approximation is used to find the most compact B-spline grain boundary contours within the given tolerance. A flexible distance selection approach is adopted to obtain the common knot vector of serial contours consisting of less knots that contain enough degrees of freedom to guarantee the existence of a B-spline curve interpolating each contour. Finally, a B-spline surface interpolating the serial contours is generated via B-spline surface skinning.

关键词： composite B-spline dominant points control points grain contour

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Water in peridotite xenoliths from South china

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science china Earth sciences 2011年第10期54卷 1511-1522页

作者： WANG Rong 1,2,3.& ZHANG BaoMin 3.1 Faculty of Land Resource Engineering, Kunming university of science and technology, Kunming 650093.{3. 2 State key laboratory for Mineral Deposits Research, Nanjing university, Nanjing 210093.{3. 3.Faculty of Earth science,{3. university of Geosciences, wuhan 43.074,{3. 1. Faculty of Land Resource Engineering Kunming University of Science and Technology Kunming 650093 China2. State Key Laboratory for Mineral Deposits Research Nanjing University Nanjing 210093 China3. Faculty of Earth Science China University of Geosciences Wuhan 430074 China

The water contents of nominally anhydrous clinopyroxene （cpx）, orthopyroxene （opx） and olivine （ol） in peridotite xenoliths hosted by Cenozoic basalts from Yingfengling, Zhangchouchun, Fujitian and Lindi, South china, were measured by Micro- FTIR. All cpx and opx grains contained a certain amount of water, which was indicated by the presence of hydroxyls in the crystal structure. The water contents （H20, ppm） of cpx and opx from peridotite xenoliths of the study areas were 293.981, 183.752, 73.586 and 51-423.ppm, and 82-471, 74-571, 53.170 and 9-13. ppm, respectively. No prominent OH absorption bands were detected for any ol grains, indicating that the water contents were below the detection limit （approximately 2 ppm）. The entire rock contents recalculated according to mineral volume proportions were 49-163. 48-168, 21-111 and 8-40 ppm, respectively. Combined with previously reported data describing the water contents of peridotite xenoliths worldwide, the results presented here suggest that water distribution in the continental lithospheric mantle is spatially heterogeneous at a global scale. The lithospheric mantle of South china is much richer in water than that of the North china Craton, and is close to that typical of off-craton localities, such as the Basin and Range Province, and Massif Central.

关键词： FTIR water peridotite xenoliths South china

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A Case Study of 3. Protein structure Prediction with Genetic Algorithm and Tabu Search

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wuhan university Journal of Natural sciences 2011年第2期16卷 125-129页

作者： WANG Ting1,2, ZHANG Xiaolong1, 3.1. School of Computer science and technology, wuhan {3. of science and technology, wuhan 43.065, hubei, china 2. College of Mobile Telecommunications, Chongqing {3. of Posts and Telecommunications, Chongqing 400065, china 3. State key laboratory of Bioelectronics, Southeast {3., Nanjing 210096, china School of Computer science and technology Wuhan University of Science and Technology Wuhan Hubei China College of Mobile Telecommunications Chongqing University of Posts and Telecommunications Chongqing China State key laboratory of Bioelectronics Southeast University Nanjing China

This paper describes a case study of 3. protein structure prediction of six sequences from protein data bank （PDB） by genetic algorithm and tabu search （GATS）, where off-lattice AB model is considered as a simplified model of protein structure. The lowest-energy values required for forming the native conformation of proteins are searched by GATS, and then the coarse structures （i.e., simplified structure） of the proteins are obtained according to the multiple angle parameters corresponding to the lowest energies. All the coarse structures form single hydrophobic cores surrounded by hydrophilic residues, which stay on the right side of the actual characteristic of protein structure. It demonstrates that this approach can predict the 3. protein structure effectively.

关键词： 3. protein structure off-lattice AB model genetic algorithm and tabu search (GATS)

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Tissue P systems with cell separation: attacking the partition problem

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science china(Information sciences) 2011年第2期54卷 293-304页

作者： ZHANG XingYi1, WANG Shuo2, NIU YunYun2 & PAN LinQiang2 1key Lab of Intelligent Computing and Signal Processing of Ministry of Education, School of Computer science and technology, Anhui {3., Hefei 23.03.,{3. 2Image Processing and Intelligent control key laboratory of Education Ministry of{3., Department of control science and Engineering, huazhong university of science and technology, wuhan 43.074,{3. 1. key Lab of Intelligent Computing and Signal Processing of Ministry of Education School of Computer Science and Technology Anhui University Hefei 230039 China2. Image Processing and Intelligent Control Key Laboratory of Education Ministry of China Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

Tissue P systems are distributed parallel and non-deterministic computing models in the framework of membrane computing, which are inspired by intercellular communication and cooperation between neurons. Recently, cell separation is introduced into tissue P systems, which enables systems to generate an exponential workspace in a polynomial time. In this work, the computational power of tissue P systems with cell separation is investigated. Specifically, a uniform family of tissue P systems with cell separation is constructed for effciently solving a well-known NP-complete problem, the partition problem.

关键词： membrane computing tissue P system cell separation partition problem

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Long-Term Cumulative Damage Model of Historical Timber Member under Varying Hygrothermal Environment

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wuhan university Journal of Natural sciences 2009年第5期14卷 430-436页

作者： WANG Xueliang,QU Weilian hubei key laboratory of Roadway Bridge and {3. Engineering,{3. university of technology,{3. 43.070,hubei,china hubei key laboratory of Roadway Bridge and {3. Engineering Wuhan University of Technology Wuhan 430070 Hubei China

A long-term damage cumulative model for the duration of load effect of structural timber is proposed in this paper, which is economical in analysis as well as involving long-term hygrothermal effect. Based on the Miner linear damage cumulative theory, the cumulative damage model is applied to analyze the annual hygrothermal, daily cyclic thermal and daily cyclic relative humidity＇s effect on load-duration behavior and to calculate the sum of damage in one year. The results indicate that the annual and daily hygrothermal effect should be taken into consideration when calculating the damage accumulation, in which the influence levels from large to small are annual hygrothermal, daily relative humidity and daily thermal effect, Considering both annual and daily hygrothermal variations as external loads the long-term model is determined. Its application to service-life prediction of a historic timber structure verifies the feasibility and high-efficiency of the proposed approach.

关键词： daily hygrothermal effect annual hygrothermal effect structural timber long-term cumulative damage model

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Adsorption of surfactants onto acrylic ester resins with different pore size distribution

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science china Chemistry 2006年第5期49卷 445-453页

作者： YANG Weiben1,2,3.LI Aimin1,3.CAI Jianguo1,3.MENG Guanhua1,3.& ZHANG Quanxing1,3.1. State key laboratory of Pollution control and Resource Reuse,School of the Environment,Nanjing {3.,Nanjing 210093.{3. 2. Nanjing College of Chemical technology,Nanjing 210048,{3. 3. Jiangsu Engineering & technology Research Center for Organic Toxicant control and Resource Reuse,Nanjing 21003.,{3. 1. State key laboratory of Pollution control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 China 2. Nanjing College of Chemical technology Nanjing 210048 China 3. Jiangsu Engineering & technology Research Center for Organic Toxicant control and Resource Reuse Nanjing 210038 China

In this study, a series of acrylic ester resins with different pore size distribution were prepared successfully by varying the type and the amount of pore-forming agents. In order to inves-tigate the adsorption behavior and mechanism of surfactants on acrylic ester resins, three kinds of surfactants were utilized as adsorbates that were sodium 6-dodecyl benzenesulfonate (6-NaDBS), sodium 1-dodecyl benzene sulfonate (1-NaDBS) and sodium 1-dodecyl sulfonate, respectively. It was observed that the surface area was available in a particular pore size and an appropriate pore size of resins appeared to be more important for the adsorption of surfactants. As compared to commercial acrylic ester resins XAD-7 and HP2MG, 50# and 3.# resins exhibited more excellent adsorption properties toward 1-NaDBS and 6-NaDBS. The experimental equilibrium data were fitted to the Langmuir, and double-Langmuir models. Two models provided very good fittings for all resins over the temperature range studied. The investigation indicated that electrostatic attraction and hydrogen bond between resins and surfactants were the main forces and had an obvious effect on adsorption proc-ess.

关键词： acrylic ester resin, surfactant, adsorption, pore size distribution, isotherm.

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A computer simulation of nucleation and growth of thin films

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science china(Physics,Mechanics & Astronomy) 2004年第4期47卷 442-451页

作者： ZHENG Xiaoping1,ZHANG Peifeng2,HE Deyan2,LIU Jun2& MA Jiantai3.1. key laboratory of Opto-Electronic technology and Intelligent {3., Ministry of Education, Lanzhou Jiaotong {3., Lanzhou 73.070, china 2. School of Physical science and technology, Lanzhou {3., Lanzhou 73.000, china 3. School of Chemistry and Chemistry Engineering, Lanzhou {3., Lanzhou 73.000, china 1. key laboratory of Opto-Electronic technology and Intelligent {3. Ministry of Education Lanzhou Jiaotong University 730070 Lanzhou China 2. School of Physical science and technology Lanzhou University 730000 Lanzhou China 3. School of Chemistry and Chemistry Engineering Lanzhou University 730000 Lanzhou China

A three-dimensional kinetic Monte Carlo technique has been developed for simulating the nucleation and growth of thin films. This model involves incident atom attachment, surface diffusion of the atoms on the growing surface and atom detachment from the growing surface. It takes some new effects into account, such as a significant improvement in calculation of activation energy for the atom diffusion, which renders the model more reasonable. In addition three optimum temperatures and the consistency of their dependence on deposition rate have been found out; the dependence of the surface roughness and relative density on the deposition rate has been discussed; and the approximation of freezing neighbour atoms and periodic boundary conditions has been applied.

关键词： Monte Carlo, thin film, nucleation, surface roughness, relative density.

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Optical properties of the micro/nano structures of Morpho butterfly wing scales

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science china(Technological sciences) 2010年第1期53卷 175-181页

作者： LIAO GuangLan,ZUO HaiBo,CAO YanBo & SHI TieLin State key laboratory of Digital Manufacturing Equipment and technology,{3. {3. of science and technology,wuhan 43.074,china 1. State key laboratory of Digital Manufacturing Equipment and technology Huazhong University of Science and Technology Wuhan 430074 China

The micro/nano structures of the wing scales in Morpho butterfly are responsible for the structural coloration,with a major part ascribed to interference and diffraction of *** optical properties of the butterfly wings were investigated by simulating a two-dimensional model using rigorous coupled-wave analysis *** is proved that they depend strongly on the structural parameters,incidence angle and refractive *** peak value and the peak wavelength of the reflection efficiency increase as the vertical periodic thickness *** peak value decreases observably,while both of the bandwidth and the peak wavelength increase when the number of the vertical periods *** of the horizontal periodic width causes a decrease of the peak value and an increase of the peak wavelength,although the variations are *** peak value decreases distinctly and the peak wavelength increases as the ambient refractive index increases,which corresponds to the variation in ambient *** research reveals the mechanisms of the brilliant structural color in Morpho butterfly,and is of great significance to the design,manufacture and applications of the bionic micro/nano structures for gas detection.

关键词： Morpho butterfly micro/nano structure rigorous coupled-wave analysis structural color

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A fast algorithm for color image enhancement with total variation regularization

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science china(Information sciences) 2010年第9期53卷 1913-1916页

作者： LI Ming1,2 1School of Computer science and technology,huazhong {3. of science and technology,wuhan 43.074,china 2key laboratory of Education Ministry for Image Processing and Intelligent control,wuhan 43.074,china 1. School of Computer science and technology Huazhong University of Science and Technology Wuhan 430074 China2. Key Laboratory of Education Ministry for Image Processing and Intelligent Control Wuhan 430074 China

In this paper,a novel algorithm for color image enhancement is *** proposed method,which is based on Retinex theory and total variational framework,improves the original variational method by using a TV penalty term to force spatial smoothness on the reflectance *** split Bregman algorithm is employed to solve the proposed *** practical experiments,it is verified that our method obtains better enhancement performance and much better calculation efficiency.

关键词： color image enhancement Retinex theory total variational model split Bregman algorithm

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Exsolution of ilmenite and Cr-Ti magnetite from olivine of garnet-wehrlite

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science china Earth sciences 2005年第9期48卷 1368-1376页

作者： LIU Xiangwen1,2, JIN Zhenmin1,3. QU Jing2 & WANG Lu2 1. State key laboratory of Geological Processes and Mineral Resources, china {3. of Geo{3.s, wuhan 43.074, china 2. Graduate School of china {3. of Geo{3.s, wuhan 43.074, china 3. Faculty of Earth {3.s, china {3. of Geo{3.s, wuhan 43.074, china 1. State key laboratory of Geological Processes and Mineral Resources China University of Geosciences 430074 Wuhan China 2. Graduate School of china university of Geosciences 430074 Wuhan China 3. Faculty of Earth sciences China University of Geosciences 430074 Wuhan China

Exsolution of rod-like ilmenite (Ilm) and Cr-Ti magnetite (Mt) have been found in olivine of garnet-wehrlite from the core of Chinese Continental sciences Drilling (CCSD). Their composition, morphology, crystal structure and their topotaxies with host olivine have been studied in detail by the transmission electron microscopy (TEM) and electron probe microanaly- sis (EPMA) technique. It shows that rod-like Ilm exsolution reported in this paper has similar characteristic with that of Alpe Arami olivine, while Cr-Ti magnetite exsolution mentioned in this paper has large discrepancy with chromite exsolution in Alpe Arami olivine. These observations suggest that both of the exsolutions found in this paper should be solid solution phases in β-olivine at their first period, then experiencing decomposition of solid solution and therefore forming Ilm and Cr-Ti magnetite exsolution with the pressure decreasing. So, this garnet-wehrlite perhaps had been ever located in mantle transition zone with a minimum depth of 3.0 km.

关键词： garnet-wehrlite, ilmenite, magnetite, exsolution, CCSD.

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