检索结果-南通市图书馆

Embed-Solitons and Their Evolutional Behaviors of (3+1)-Dimensional Burgers System

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第7期48卷 57-62页

作者： ZHU Hai-Ping ZHENG Chun-Long College of Mathematics and Physics,Lishui university,zhejiang 32.000,{2.2.Shanghai institute of Applied Mathematics and Mechanics,Shanghai university,Shanghai 2.0072.{2. College of Mathematics and Physics Lishui University Zhejiang 323000 China

With the help of an extended mapping approach and a linear variable separation method,new families ofvariable separation solutions with arbitrary functions for the(3+1)-dimensional Burgers system are *** onthe derived exact solutions, some novel and interesting localized coherent excitations such as embed-solitons are revealedby selecting appropriate boundary conditions and/or initial *** time evolutional properties of the novellocalized excitation are also briefly investigated.

关键词： extended mapping method (3+1)-dimensional Burgers system embed-soliton evolutional behavior

Theoretical model of particle orientation distribution function in a cylindrical particle suspension subject to turbulent shear flow

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2006年第1期16卷 16-20页

作者： ZHANG Lingxin1, LIN Jianzhong1and ZHANG Weifeng 2.1.Department of Mechanics, State Key Laboratory of Fluid Power Transmission and Control, zhejiang university, Hangzhou 31002., {2. 2. institute of Marine and Coastal Sciences, Rutgers university, New Brunswick, New Jersey, USA) [a]Department of Mechanics State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou China [b]institute of Marine and Coastal Sciences Rutgers University' New Brunswick New Jersey USA

The equation for the orientation probability function of slender cylindrical particles suspended in planar turbulent flows was investigated. After ensemble averaging, the equations for the mean and fluctuating probability function were derived. The equation for the fluctuating probability function appearing in the equation of mean probability function was solved by using the method of characteristics analysis. The orientational dispersion terms due to the random motion of cylindrical particles in the equation of mean probability function are related to the mean probability function and the Lagrangian fluid velocity correlations. The evolution of the mean probability function was described by a modified oriental ion-space-convection equation, where the dispersion terms account for the randomizing effect of the turbulence.

关键词： dispersion cylindrical particle suspensions turbulent flow probability function.

Fractal Characteristic of Pits Distribution on 304 Stainless Steel Corroded Surface and Its Application in Corrosion Diagnosis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan university of Technology(Materials Science) 2007年第3期22卷 389-393页

作者：梁成浩 Electromechanics & Materials Engineering College Dalian Maritime University

Electrochemical techniques and fractal theory were employed to study the corrosion behaviors and pits distribution characteristics on the corroded surfaces of 304 stainless steel exposed in FeCl3 solution. Fractal features of pits distribution over the corroded surfaces were observed and described by the fractal dimension. A 5-8-2.back-propagation （BP） artificial neural network model for the diagnoses of the pitting corrosion rate and pits deepness of 304 stainless steel under various conditions was developed by considering the fractal dimension as a key parameter for describing the pitting corrosion characteristics. The predicted results are well in agreement with the experimental data of pitting corrosion rate and pit deepness. The max relative errors between their experimental and simulation data are 6.69% and 4.62., respectively.

关键词： 304 stainless steel pits distribution fractal neural network diagnosis

Kinetics analysis of volume phase transition of intelligent neutral thermo-sensitive hydrogels

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2008年第5期51卷 532-540页

作者： WANG XiaoGui1 & LI YiQuan2.1 College of Mechanical Engineering,zhejiang university of Technology,Hangzhou 310032.china 2.School of Mechanical & Electronic Engineering,Changchun {2. of Science and Technology,Changchun 13002.,china 1. College of Mechanical Engineering Zhejiang University of Technology Hangzhou 310032 China 2. School of Mechanical & Electronic Engineering Changchun University of Science and Technology Changchun 130022 China

In this work,utilizing the first law of thermodynamics and the Flory mean-field theory,the kinetic deformation studies concerning the volume phase transition of the neutral thermo-sensitive hydrogels were performed *** hydrogel was assumed as a biphasic mixture medium in the framework of the continuum mixture *** the energy conservation of the thermodynamics system of the hydrogel,the governing equations for the kinetics of the nonlinear large deforma-tion were *** explicit analytical expressions of the effective stress tensor and the chemical potential of the fluid of the thermo-sensitive hydrogel PNIPA were also obtained from the Helmholtz free energy,which can model the steady-static volume phase transition quantitatively.

关键词： thermo-sensitive hydrogel volume phase transition effective stress energy conservation

Preparation and Electrocatalytic Activity of Polyaniline-poly (Propylene Oxide) Modified by Pt Nanoparticles

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan university of Technology(Materials Science) 2006年第4期21卷 9-11页

作者：李美超 College of Chemical Engineering and Material Science State Key Laboratory Breeding Base of Green Chemistry-Synthesis TechnologyZhejiang University of TechnologyHangzhou 310032China

The preparation and electrocatalytic activity of polyaniline-poly （ propylene oxide ）（ PAN-PPO ） modified by Pt particles （ Pt/ PAN-PPO ） were investigated. Pt/ PAN-PPO was characterized by scanning electron microscopy （SEM） and energy dispersive spectroscopy （ EDS ）. Pt particles on PAN-PPO were in the nanometer range, and dispersed in a three-dimensional distribution on the surface of PAN-PPO film. Compared with polyaniline and glassy carbon modified with Pt particles under the same conditions, Pt/PAN-PPO exhibited a high electrocatalytic activity for lysine oxidation.

关键词： aniline propylene oxide copolymer platinum electrocatalytic activity lysine

High-resolution dating of Co-rich crusts: A comparative study using the methods of orbital pacing and ^(2.0)Th_(ex)/^(2.2.Th dating

在线全文

学校读者我要写书评

暂无评论

Science china Earth Sciences 2009年第4期52卷 484-488页

作者： HAN XiQiu1,2. QIU ZhongYan1,2.3, MA WeiLin1,2.& QIAN JiangChu1,2.1 Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012. china 2.Second institute of Oceanography, State Oceanic Administration, Hangzhou 310012. china 3 Department of Earth Sciences, zhejiang university, Hangzhou 31002., china Key Laboratory of Submarine Geosciences State Oceanic Administration Hangzhou 310012 China Second institute of Oceanography State Oceanic Administration Hangzhou 310012 China Department of Earth Sciences Zhejiang University Hangzhou

Due to their slow growth rates, seamount Co-rich crusts are very difficult to date with high resolution and precision. This paper is to test the use of orbital pacing on the growth profile of crusts to determine high-resolution age and growth rate. Crust CB14 from the central Pacific Ocean was selected for this study. We first examined the growth pattern in detail under a reflected-light microscope and ascertained that the growth environment was stable for the sub-layer 1 (0-3 mm). We then used electron micro-probe line-scanning to obtain elemental profiles. The pattern of the power spectrum analysis of the Al-profile revealed that there are significant cycles of 113.9, 87.8, 51.5, 42.2.and 2..8 μm. These cycles correspond to the Milankovitch cycles of 53.1, 41, 2., 19.7 and 12.ka, respectively, and yield the growth rate of about 2.14 mm/Ma and an age of about 1.40 Ma for the boundary between the sub-layer 1 and sub-layer 2. We also used a drilling machine with a numerically controlled drive to obtain high-resolution samples at 0.1mm intervals, and used the 2.0Thex/2.2.h method to date the samples. For the uppermost 1.3 mm, the growth rate was about 2.15 mm/Ma, and the age for the layer at the depth of 3 mm was about 1.40 Ma, which coincides perfectly with the results obtained from orbital pacing. Thus, it is considered that orbital pacing is a new and effective method to determine the growth rate of the seamount Co-rich crust. This method is applicable for establishing a high-resolution age frame for the crusts of the world's oceans.

关键词： seamount Co-rich crust Milankovitch cycles 2.0Thex/2.2.h dating growth rates of Mn-crusts central Pacific Ocean

Prediction of Tumor Outcome Based on Gene Expression Data

在线全文

学校读者我要写书评

暂无评论

Wuhan university Journal of Natural Sciences 2004年第2期9卷 177-182页

作者： Liu Juan 1,2. Hitoshi Iba 3 1. School of Computer, Wuhan university, Wuhan 430072. Hubei, china 2. State Key Laboratory of Software Engineering, Wuhan 430072. Hubei, china 3. Department of Frontier informatics, university of Tokyo, Tokyo 113-8656, Japan Wuhan university School of Computer Wuhan Hubei China (GRID:grid.49470.3e) (ISNI:***) State Key Laboratory of Software Engineering Wuhan Hubei China (GRID:grid.49470.3e) university of Tokyo Department of Frontier Informatics Tokyo Japan (GRID:grid.26999.3d) (ISNI:***)

Gene expression microarray data can be used to classify tumor types. We proposed a new procedure to classify human tumor samples based on microarray gene expressions by using a hybrid supervised learning method called MOEA+WV (Multi-Objective Evolutionary Algorithm+Weighted Voting). MOEA is used to search for a relatively few subsets of informative genes from the high-dimensional gene space, and WV is used as a classification tool. This new method has been applied to predicate the subtypes of lymphoma and outcomes of medulloblastoma. The results are relatively accurate and meaningful compared to those from other methods. Key words bioinformatics - tumor classification - Pareto optimization - MOEA CLC number Q 786 - TP 181 Foundation item: Supported by the National Natural Science Foundation of china (60301009), the Foundation of Young Scholars of Ministry of Education of china (150118) and Chenguang Project of Wuhan City (2.112.009).Biography: Liu Juan (1970-), female, Associate Professor, Postdoctoral, research direction: bioinformatics, data mining, machine learning.

关键词： bioinformatics tumor classification Pareto optimization MOEA

Paleomagnetic results of the Cretaceous marine sediments in Tongyouluke, southwest Tarim

在线全文

学校读者我要写书评

暂无评论

Science china Earth Sciences 2005年第3期48卷 406-416页

作者： SHEN Zhongyue1, CHEN Hanlin1, FANG Dajun1, DING Jinghai1, ZHANG Shiben2. HUANG Zhibin2.& LI Meng2.1. Department of Earth Sciences, zhejiang university, Hangzhou 31002. {2. 2. Tarim Oil Field Company, Petro{2. Company Limited, Korla 830011, {2. 1. Department of Earth Sciences Zhejiang University 310027 Hangzhou China 2. Tarim Oil Field Company PetroChina Company Limited 830011 Korla China

Paleomagnetic and rock magnetic studies on samples of 18 sites from the Creta- ceous marine sedimentary rocks in the Tongyouluke section, Akto County, southwest Tarim, china show that the magnetic carriers of the Lower Cretaceous are dominated by hematite with some magnetite, while the magnetic carriers of the Upper Cretaceous are characterized by a combination of magnetite and titanomagnetite as well as hematite and goethite. Stepwise thermal demagnetization is performed and vector analysis is used to isolate magnetic components, which illustrates a single magnetic component or double magnetic components. The high temperature stable components are dual polarities and pass polarity test, reversal test and consistency test. The overall mean direction of the Lower Cretaceous is D = 2..0°, I = 42.0°, α95=6.5° with pole position at φ = 190.3°, λ=63.1°, dp=4.9°, dm=8.0°. The overall mean direction of the Upper Cretaceous is D = 2..1°, I = 39.4°, α95=11.2. with pole position at φ =190.9°, λ=60.3°, dp= 8.0°, dm=13.4°. Compared with the inclination of the Early Cretaceous from red beds of north Tarim, the contemporary inclination of southwest Tarim is 10.0°±7.8° sharper, but it is still 8.1° ±8.9°, shallower than that of Early Cretaceous basalts in southwest Tarim. Although these pa- leomagnetic data show slightly larger confidence limit, the paleolatitude of the marine Cretaceous tends to lie between that of terrestrial red beds and volcanic rocks.

关键词： Tarim paleomagnetism, Cretaceous, magnetic inclination, red beds, marine sedimentary rock.

The non-destructive analysis of ancient jade artifacts unearthed from the Liangzhu sites at Yuhang,zhejiang

在线全文

学校读者我要写书评

暂无评论

Science china(Technological Sciences) 2010年第12期53卷 3404-3419页

作者： GAN FuXi1,3, CAO JingYan2. CHENG HuanSheng3, Gu DongHong1, RUI GuoYao2. FANG XiangMing2. DONG JunQing1 & ZHAO HongXia1 1Scientific Archeology Center, Shanghai institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 2.1800, china 2.Research institute of Cultural Relics and Archeology of zhejiang, Hangzhou 310014, china 3 Fudan university, Shanghai 2.0433, china 1. Scientific Archeology Center Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China3. Fudan University Shanghai 200433 China2. Research Institute of Cultural Relics and Archeology of Zhejiang Hangzhou 310014 China

Samples of the jade artifacts unearthed from the Liangzhu sites at Yuhang (Fanshan,Yaoshan, Huiguanshan and Tangshan) of zhejiang province were described. The chemical composition, phase and jade structure of a hundred and more intact samples were analyzed by the non-destructive techniques of PIXE, XRD and laser Raman spectroscopy. Results showed that the minerals of the jade artifacts mostly belonged to tremolite and tremolite-actinolite. Relationship of the civilization development in the Neolithic age and the application of tremolite type mineral in jade artifacts was discussed. The contents of rare and trace elements in tremolite jade artfacts and in mineral samples were measured for the first time. The possible mineral sources of these tremolite type jade artifacts were discussed.

关键词： Liangzhu culture non-destructive analysis ancient jade artifacts essence and source