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Existence of multiple solutions for the laminar flow in a porous channel with suction at both slowly expanding and contracting walls 认领 引用 被引量：2
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作者 Xin-hui Si Lian-cunZheng +1 位作者 Xin-xin Zhang Ying Chao 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2011年第4期494-501,共8页
The asymptotic behavior of solutions of a similarity equation for the laminar flow in a porous channel with suction at both expanding and contracting walls has been obtained by using a singular perturbation method.How... The asymptotic behavior of solutions of a similarity equation for the laminar flow in a porous channel with suction at both expanding and contracting walls has been obtained by using a singular perturbation method.However,in the matching process,this solution neglects exponentially small terms.To take into account these exponentially small terms,a method involving the inclusion of exponentially small terms in a perturbation series was used to find two of the solutions analytically.The series involving the exponentially small terms and expansion ratio predicts dual solutions.Furthermore,the result indicates that the expansion ratio has much important influence on the solutions. 展开更多
关键词 laminar flow porous channels multiple solutions singular perturbation method
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Anti-control and Generalized Synchronization of Chaos for a Kind of n-Dimensional Linear Differential System 认领 引用 被引量：5
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作者 ZHANG Xiao-Dan LI Zhi-Ping 《Communications in Theoretical Physics》 SCIE CAS 2006年第3期461-472,共12页
This paper introduces the finding of some chaotic attractors in a kind of n-dimensional autonomous hybrid system, which is realized via applying some discontinuous state feedback to a kind of n linear differential sys... This paper introduces the finding of some chaotic attractors in a kind of n-dimensional autonomous hybrid system, which is realized via applying some discontinuous state feedback to a kind of n linear differential system. And a constructive theorem is proposed for generalized synchronization related to the above chaotic hybrid systems. Examples are presented for illustrating the methods. 展开更多
关键词 chaos discontinuous state feedback generalized synchronization
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Theorems for Testing Local Activity of CNN and Application to Cardiac Purkinje Equations 认领 引用 被引量：1
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作者 Lequan Min 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS 2000年第2期139-146,共8页
The theorems for testing the local in one-port cellular neural/inear network(CNN)cells with four local state variables are presented.Using the theorems computes the bifurcation diagrams of the cardiac Purkinje fiber(C... The theorems for testing the local in one-port cellular neural/inear network(CNN)cells with four local state variables are presented.Using the theorems computes the bifurcation diagrams of the cardiac Purkinje fiber(CPE)equations Which describethe long-lasting action and pace-maker potentials of the Purkinje fiber of the heart.The computer simulation shows that periodic trajectories or convergent trajectories of the CPF Equations can be foun if the cormsponing cell Parameters are located in a positive domainbut nearby edge of chaos.In particular a heart with approximate normal frequency of heartbeat but non-normal electrocardiogram maysuddenly stop by slightly perturbing the parameters of the corresponding CPF Equations when the Paramders are located nearby the edge of chaos in the bifurcation diagrams.This research seems to interpret reasonbly the phenomena that patients with cardiac diseases might suddenly die without warning. 展开更多
关键词 cellular neural network local activity cardiac Purkinje fiber heartbeat
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Structure and Formative Mechanism of Black Patina on Bronze Mirrors 认领 引用
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作者 Zhaozeng Ma Ling Du +2 位作者 Xiulan Yin Lianji Jin Chunying Fang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS 1998年第3期147-155,共9页
The formation of the black patina induced by soil humic asid under different conditions was studied,theblack,grey and brown colored shiny surfaces prepared in laboratory were analyzed.As a result the formation oftin-r... The formation of the black patina induced by soil humic asid under different conditions was studied,theblack,grey and brown colored shiny surfaces prepared in laboratory were analyzed.As a result the formation oftin-rich shiny black surface on bronze mirrors is the product of soil corrosion of the bronze mirrors.The patina isformed by reection between the alloy and the humic acid in soil,and leaching of copper and lead oxides through along period time when the mirrors were buried under the ground leaving a dense compact corrosion-resistant layerconsisted predominantly of stannic oxide microcrystal. 展开更多
关键词 black patina on ancient bronze mirror humic acid soil corrosion,SnO2microcrystal
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Algorithm for Computation of Unstructured Real Stability Radius and Its Applications 认领 引用
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作者 Xiaodan Zhang Lequan Min 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS 1998年第4期245-250,共6页
An algorithm for the computation of the unstructured real stability radius of high dimensional linearsystem is presented.Using the accurate formula of the real stability radius of 2-dimensional system linear systemche... An algorithm for the computation of the unstructured real stability radius of high dimensional linearsystem is presented.Using the accurate formula of the real stability radius of 2-dimensional system linear systemchecks the algorithm.The result shows that the algorithm is reliable and efficient.As applications,the unstructuredreal stability radii of 2-dimensional Chua's circuit and 3-dimensional piecewise-linear system are calculated,thedynamical orbits of the corresponding perturbed systems are simulated. 展开更多
关键词 lincar systems stability robustness parameter perturbation computational methods
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Analytical Criteria for Local Activity of CNN with Two-port and Application to Biochemical Model 认领 引用 被引量：1
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作者 Lequan Min Na Yu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS 2000年第4期305-314,共10页
The analytic criteria are presented for the local activity theory in two-port Cellular Neural Network (CNN) cells with three local state variables, and the application to a Biochemical Model CNN (BMCNN) is given for c... The analytic criteria are presented for the local activity theory in two-port Cellular Neural Network (CNN) cells with three local state variables, and the application to a Biochemical Model CNN (BMCNN) is given for coupling in series of two enzymes whose prototype was studied by Decroly and Goldbeter. The bifurcation diagrams of the BMCNN's show that there does not exist a locally passive domain, and the computer simulation exhibited that convergent patterns, oscillatory patterns or chaotic patterns may emerge if the selected cell parameters are located in locally active unstable domains but nearby the edge of chaos domain. In particular, the coexistence of multiple oscillations was observed in the corresponding triple cell couples of the BMCNN's with the same initial conditions. 展开更多
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Re-assessment and Optimization of the Ga-M(M=In,Sb,Pb)Systems with Chemsage 认领 引用
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作者 Xianran Xing Thiyu Qiao Herbert IPser 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS 1998年第4期212-218,共7页
The thermodynamic properties and the phase diagrams of the systems Ga-M(M=In,Sb,Ph)were critically re-assessed and optimized employing the software package ChemSage for the calculation of thermodynamicequilibria.The R... The thermodynamic properties and the phase diagrams of the systems Ga-M(M=In,Sb,Ph)were critically re-assessed and optimized employing the software package ChemSage for the calculation of thermodynamicequilibria.The Redlich-Kister/Margules formalism was employed for all solution phases and sets of self-consistentthermodynamic parameters were obtained.The results of re-assessment and optimization are compared with previous work,they are in excellent agreement with most experimental data. 展开更多
关键词 phase diagram calculation CALPHAD method gallium-based alloy thermodynamic property
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Numerical simulation of strain localization and damage evolution in large plastic deformation using mixed finite element method 认领 引用
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作者 Zhanghua Chen Jiajian Jin Jiumei Xiao 《Journal of University of Science and Technology Beijing》 2004年第3期273-277,共5页
An investigation of computer simulation is presented to analyze the effectsof strain localization and damage evolution in large plastic deformation.The simulation is carriedout by using an elastic-plastic-damage coupl... An investigation of computer simulation is presented to analyze the effectsof strain localization and damage evolution in large plastic deformation.The simulation is carriedout by using an elastic-plastic-damage coupling finite element program that is developed based onthe concept of mixed interpolation of displacement/pressure.This program has been incorporated intoa damage mechanics model as well as the corresponding damage criterion.To illustrate theperformance of the proposed approach,a typical strain localization problem has been simulated.Theresults show that the proposed approach is of good capability to capture strain localization andpredict the damage evolution. 展开更多
关键词 strain localization mixed element truesdell stress rate material damage
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Genetic Algorithm for the Thermal Stresses Optimum Design ofFunctionally Gradient Material Plate 认领 引用 被引量：2
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作者 Xiaodan Zhang Zhengbin Tang Changchun Ge 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS 1999年第3期224-227,共4页
Based on the thermal stress distribution for functionally gradient material(FGM)plates,a Genetic Algorithm(GA)method for the thermal stresses optimum design of FGM plate with computer technologies is given.The minimum... Based on the thermal stress distribution for functionally gradient material(FGM)plates,a Genetic Algorithm(GA)method for the thermal stresses optimum design of FGM plate with computer technologies is given.The minimum thermal stresses combination distribution for FGM is obtained. 展开更多
关键词 functionally gradient material(FGM) thermal stress Genetic Algorithm(GA) crossover mutation
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A numerical method for solving the boundary layer equations of laminar natural convention about a vertical plate 认领 引用 被引量：8
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作者 Liancun Zheng Chen Liang Xinxin Zhang 《Journal of University of Science and Technology Beijing》 2007年第1期33-35,共3页
An improved shooting method was presented for solving the natural convention boundary layer equations, with a coupling of the velocity field to the temperature field. The numerical results are consistent with the appr... An improved shooting method was presented for solving the natural convention boundary layer equations, with a coupling of the velocity field to the temperature field. The numerical results are consistent with the approximate solution obtained by former researchers. 展开更多
关键词 shooting method Runge-Kutta method natural convention
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Homotopy analysis solutions for the asymmetric laminar flow in a porous channel with expanding or contracting walls 认领 引用 被引量：7
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作者 X.-H. Si L.-C. Zheng +1 位作者 X.-X. Zhang Y. Chao 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2011年第2期208-214,共7页
In this paper, the asymmetric laminar flow in a porous channel with expanding or contracting walls is investigated. The governing equations are reduced to ordinary ones by using suitable similar transformations. Homot... In this paper, the asymmetric laminar flow in a porous channel with expanding or contracting walls is investigated. The governing equations are reduced to ordinary ones by using suitable similar transformations. Homotopy analysis method （HAM） is employed to obtain the expres- sions for velocity fields. Graphs are sketched for values of parameters and associated dynamic characteristics, especially the expansion ratio, are analyzed in detail. 展开更多
关键词 Homotopy analysis method · Expanding or contracting wall · Asymmetric laminar flow · Porous channel · Expansion ratio
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Analysis of rare earth elements in high purity europium oxide 认领 引用 被引量：1
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作者 LU Yiqiang CAO Yanqiu +1 位作者 WANG Lihua XIN Renxuan 《Rare Metals》 SCIE EI CAS 2005年第3期216-220,共5页
Five trace impurities as Ce, Pr, Sm, Gd, and Dy are separated from europium oxide with P507 extraction resin by extraction chromatography. When determined simultaneously by ICP-AES, the impurities show their recovery ... Five trace impurities as Ce, Pr, Sm, Gd, and Dy are separated from europium oxide with P507 extraction resin by extraction chromatography. When determined simultaneously by ICP-AES, the impurities show their recovery ratios between 88% and 105%. A lower than 10% relative standard deviation of these elements is obtained when their contents in europium oxide are 5μg/g. The satisfactory results indicate this simple method is sensitive and accurate. It has been employed in the analysis of these five rare earth elements in 99.99% europium oxide. 展开更多
关键词 analytical chemistry rare earth elements separation ICP-AES extraction resin
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Surface modification of up-conversion luminescence material Na[Y0.57Yb0.39Er0.04]F_4 with hydrosulfide group 认领 引用 被引量：2
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作者 Lili Cui Huili Fan +2 位作者 Junping Xiao Xiaowei Xu Dong Su 《Journal of University of Science and Technology Beijing》 2008年第5期605-610,共6页
A new method was reported for surface modification of an up-conversion luminescence material with hydrosulfide group. The factors that may influence the surface modification,such as reaction time,amount of catalyzer a... A new method was reported for surface modification of an up-conversion luminescence material with hydrosulfide group. The factors that may influence the surface modification,such as reaction time,amount of catalyzer and modifier,and reaction solvent,were investigated. The optimal conditions were that the reaction time,the quantity of the basic catalyzer,the quantity of modifier and the volume of reaction solvent were 40 min,1.0,1.0,and 40 mL,respectively. The results indicated that hydrosulfide group content modified on the surface of up-conversion luminescence material reached to 0.1430 mmol/g,and this modified up-conversion luminescence material could be widely used in the study of structure of protein and the property of microenvironment. 展开更多
关键词 upconversation surface modification luminescence material hydrosulfide react condition
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Electrochemical Characteristic of Decarburization Reaction 认领 引用 被引量：1
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作者 Xionggang Lu Fushen Li +1 位作者 Lifen Li Kouchih Chou 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS 1999年第1期27-30,共4页
The electrochemical mechanism of the reaction between Fe-C melts and CaO-SiO2-Al2O3-FeOx slag systems has been carried out.The experimental results suggest that the final content of carbon in melt increases as the par... The electrochemical mechanism of the reaction between Fe-C melts and CaO-SiO2-Al2O3-FeOx slag systems has been carried out.The experimental results suggest that the final content of carbon in melt increases as the partial oxygen pressure of gas decreases no matter whether there is electronic conductor or not.However,the final content of carbon in the system with electronic conductor is much lower than that without electronic conductor.It can be deduced that the transfer ability of oxygen in slag is dominated by electrons.When an electronic conductor exists,an easy pathway for the electrons is provided and the oxygen transfer rate is accelerated. 展开更多
关键词 melt-slag reaction decarburization electrochemistry electronic conductor
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An efficient analytical decomposition and numerical procedure for boundary layer flow on a continuous stretching surface 认领 引用 被引量：3
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作者 Xuehui Chen Liancun Zheng Xinxin Zhang 《Journal of University of Science and Technology Beijing》 2006年第5期401-405,共5页
An efficient Adomian analytical decomposition technique for studying the momentum and heat boundary layer equations with exponentially stretching surface conditions was presented and an approximate analytical solution... An efficient Adomian analytical decomposition technique for studying the momentum and heat boundary layer equations with exponentially stretching surface conditions was presented and an approximate analytical solution was obtained, which can be represented in terms of a rapid convergent power series with elegantly computable terms. The reliability and efficiency of the approximate solution were verified using numerical solutions in the literature. The approximate solution can be successfully applied to provide the values of skin friction and the temperature gradient coefficient. 展开更多
关键词 momentum heat transfer stretching surface decomposition technique analytical approximation
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Redistribution of Boron during Ferrite Reaction in Nb-B Microalloyed Steel 认领 引用 被引量：1
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作者 Shanwu Yang Xinlai He 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS 1998年第4期223-227,共5页
By contrast of microstructure and boron distribution in the same area of samples,the behavior of boronduring ferrite reaction in Nb-B microalloyed steel was studied.Boron atoms have segregated to original austenitebou... By contrast of microstructure and boron distribution in the same area of samples,the behavior of boronduring ferrite reaction in Nb-B microalloyed steel was studied.Boron atoms have segregated to original austeniteboundaries betfore ferrite reaction starts during isothermal treatment.The concentration of boron in small Pieces offerrite foming along austenite boundaries may be remarkably higher than that in austenite matrix,but it will reducegradually when the ferrite continuously grows.There is no obvious boron segregation on interface ofγ/αandα/α.These facts indicate that ferrite growth is not controlled by diffusion of boron in austenite. 展开更多
关键词 boron segregation ferrite reaction microalloyed steel
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Analytic decomposition and numerical procedure for solving the singular boundary value problem arising in viscous flows 认领 引用 被引量：1
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作者 Liancun Zheng Fei Ma +1 位作者 Jing Zhu Xinxin Zhang 《Journal of University of Science and Technology Beijing》 2006年第3期226-229,共4页
An efficient analytical decomposition technique was presented for solving the singular nonlinear boundary value problem arising in viscous flow when the Crocco variable was introduced. The approximate analytical solut... An efficient analytical decomposition technique was presented for solving the singular nonlinear boundary value problem arising in viscous flow when the Crocco variable was introduced. The approximate analytical solution may be represented in terms of a rapid convergent power series with elegantly computable terms. The reliability and efficiency of the approximate solutions were verified by numerical ones in the literature. The approximate analytical solutions can be successfully applied to give the values of skin friction coefficient. 展开更多
关键词 singular nonlinear boundary value problem analytical decomposition boundary layer similarity solution
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Fixation for the helical structure of a glassy cholesteric liquid crystal reflective film 认领 引用 被引量：1
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作者 Jiumei Xiao Wanli He +1 位作者 Jin Gao Huai Yang 《Journal of University of Science and Technology Beijing》 2006年第5期476-479,共4页
The planar texture of glassy cholesteric siloxane cyclic side-chain liquid crystals was fixed by quenching initially. Then the polymer network formed by the optically active polymerizable monomers imposed additional c... The planar texture of glassy cholesteric siloxane cyclic side-chain liquid crystals was fixed by quenching initially. Then the polymer network formed by the optically active polymerizable monomers imposed additional constraints on the motion of chain segments of the glassy liquid crystal and then further stabilized the molecule arrangement. A cholesteric liquid crystal film with stable optical properties was developed by this method. 展开更多
关键词 cholesteric liquid crystal helical structure glassy liquid crystal
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Equilibrium Precipitation of Niobium Carbonitride in Austenite 认领 引用 被引量：1
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作者 Fuming Wang Wenchao Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS 1998年第3期119-122,共4页
The equilibrium between niobium carbonitride and austenite has been studied.Experimentally,X-raydiffaction technique was adopted to verify that the precipitates have the same composition and structure.Theoretical-ly,H... The equilibrium between niobium carbonitride and austenite has been studied.Experimentally,X-raydiffaction technique was adopted to verify that the precipitates have the same composition and structure.Theoretical-ly,Hillert and Staffansson's regular model about stoichimetric phase was used to describe the thermodynamic proper-ties of multi-component precipitate.Calculated results agree well with experimental values from literatures. 展开更多
关键词 equilibrium niobium precipitate austenite
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Cleaning of Chromate Manufacture Process 认领 引用 被引量：1
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作者 Xing Zou Yi Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS 2000年第2期132-134,共3页
Sodium chromate solubility is determined in the range of NaOH concentrations from 450 to 810 g/L andsolution temperatUres from 30 to 110℃.The optimized conditions to separate sodium chromate from NaOH inleached solut... Sodium chromate solubility is determined in the range of NaOH concentrations from 450 to 810 g/L andsolution temperatUres from 30 to 110℃.The optimized conditions to separate sodium chromate from NaOH inleached solution are resolved.It is first found the method to efficiently separate sbdium chromate from NaOH andsodium altuninate in crude sodium chromate.Bench-scale studies on the separating are performed.Finally,goodseparation results are achieved. 展开更多
关键词 chromate separation clean process
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