Silica fume, fly ash and nano-fiber mineral materials (NR powder) are employed to incorporate into cement-based materials. According to the grain grading mathematical model of cement-based materials, two packing syste...Silica fume, fly ash and nano-fiber mineral materials (NR powder) are employed to incorporate into cement-based materials. According to the grain grading mathematical model of cement-based materials, two packing systems, namely, spherical grading system and nano-fiber reinforced system were designed. Properties and interfacial microstructure of the two systems were studied according to secondary interface theory. It was shown that nano-fiber mineral materials can improve the grain grading of the admixture, increase the density of the system, improve the microstructure of the interface and the hardened paste, and enhance the uniformity of cement-based materials mixed with composite micro-grains and greatly increase their wearable rigidity and flexure strength. In this paper, two kinds of interface models, including spherical grain model and nano-fiber reinforced interface model of the cement-based materials mixed with composite micro-grains, were brought forward.展开更多
A plane-symmetric inhomogeneous cosmological model of perfect fluid distribution with electro-magnetic field is obtained. F12 is the non-vanishing component of electromagnetic field tensor. To get a deterministic solu...A plane-symmetric inhomogeneous cosmological model of perfect fluid distribution with electro-magnetic field is obtained. F12 is the non-vanishing component of electromagnetic field tensor. To get a deterministic solution, we assume the free gravitational field is Petrov type-Ⅱ non-degenerate. Some physical and geometric properties of the model are also discussed.展开更多
In this paper we give a characterization of planar lattices, and show that the sublattice L C Zn corresponding to the Hibi ideal of a finite distributive lattice L has a nice lattice basis if and only if L is planar. ...In this paper we give a characterization of planar lattices, and show that the sublattice L C Zn corresponding to the Hibi ideal of a finite distributive lattice L has a nice lattice basis if and only if L is planar. We also consider the Grobner basis of the lattice basis ideal attached to the planar lattices.展开更多
The authors investigate the stability of a steady ideal plane flow in an arbitrary domain in terms of the L^2 norm of the vorticity. Linear stability implies nonlinear instability provided the growth rate of the line...The authors investigate the stability of a steady ideal plane flow in an arbitrary domain in terms of the L^2 norm of the vorticity. Linear stability implies nonlinear instability provided the growth rate of the linearized system exceeds the Liapunov exponent of the flow. In contrast,a maximizer of the entropy subject to constant energy and mass is stable. This implies the stability of certain solutions of the mean field equation.展开更多
A two-phase elasto-plastic material is investigated. It is shown that, if the interface is modeled as the limit of a vanishing layer of a third material, then the resulting two-phase material will exhibit a smaller in...A two-phase elasto-plastic material is investigated. It is shown that, if the interface is modeled as the limit of a vanishing layer of a third material, then the resulting two-phase material will exhibit a smaller interracial dissipation than that of a pure two- phase model.展开更多
In this paper,we study the global singular symplectic flops related to the following affine hypersurface with cyclic quotient singularities,Vr,b={(x,y,z,t)∈C4|xy-z2r+t2=0}/μr(a,-a,b,0),r 2,where b=1 appears in Mori...In this paper,we study the global singular symplectic flops related to the following affine hypersurface with cyclic quotient singularities,Vr,b={(x,y,z,t)∈C4|xy-z2r+t2=0}/μr(a,-a,b,0),r 2,where b=1 appears in Mori’s minimal model program and b=1 is a new class of singularities in symplectic birational geometry.We prove that two symplectic 3-orbifolds which are singular flops to each other have isomorphic Ruan cohomology rings.The proof is based on the symplectic cutting argument and virtual localization technique.展开更多
The Yarlung Tsangpo River,the longest river in Tibet,houses most of the population and economy in Tibet Autonomous province.Under the rapid development of economy and society in Tibet,the pollution in the Yarlung Tsan...The Yarlung Tsangpo River,the longest river in Tibet,houses most of the population and economy in Tibet Autonomous province.Under the rapid development of economy and society in Tibet,the pollution in the Yarlung Tsangpo River basin has rapidly increased.Evaluating water quality and water environmental capacity is needed for water resource management in Tibet.This study used a single factor evaluation method to evaluate water quality of the Zhongba-Nyingchi section of the Yarlung Tsangpo River based on measured data of CODcr, NH3-N and TP in the study area.Based on these data,determinations of ideal water environmental capacity, emissions of pollutants and remaining water environmental capacity of the study area were made by a one-dimensional steady water quality model under either section-head control or cross-section control.The data indicate that most of the monitoring sections in the study area experienced good water quality.The three pollutants all had large remaining water environmental capacity generally,but TP exceeded state levels in the two upstream functional areas,and levels above state standards of CODcr and TP were found in several calculation cells of the two downstream functional areas.Therefore,emissions of pollutants need to be reduced to protect the water environment quality of the Yarlung Tsangpo River.展开更多
This paper studies a class of variational problems which involving both bulk and surfaceenergies. The bulk energy is of Dirichlet type though it can be in very general forms allowingunknowns to be scalar or vectors.Th...This paper studies a class of variational problems which involving both bulk and surfaceenergies. The bulk energy is of Dirichlet type though it can be in very general forms allowingunknowns to be scalar or vectors.The surface energy is an arbitrary elliptic parametric integralwhich is defined on a free interface. One also allows other constraints such as volumes of partitioning sets. One establishes the existence and regularity theory, in particular, the regularityof the free interface of such problems.展开更多
China has entered a new era in our march toward the rule of law,and the principal contradiction facing Chinese society has changed into one between the people’s evergrowing need for a better life and unbalanced and i...China has entered a new era in our march toward the rule of law,and the principal contradiction facing Chinese society has changed into one between the people’s evergrowing need for a better life and unbalanced and inadequate development.At the rule of law level,the contradiction manifests itself as a gap between the public’s expectations of rule of law construction and its unbalanced and inadequate development in legislation,law enforcement,the judicial system,legal compliance,legal supervision,etc.The Report to the 19th National Congress of the Communist Party of China points out that law-based governance is an essential requirement and important guarantee for socialism with Chinese characteristics.It outlines an impressive blueprint for building the rule of law in the new era,and further expounds the basic strategy for building the rule of law in China in the future.It provides the guiding ideology and program of action for the comprehensive rule of law and establishes the goal of building the rule of law.Under the guidance of Xi Jinping thought on socialism with Chinese characteristics for a new era,rule of law construction in China will embark on a new journey.展开更多
文摘Silica fume, fly ash and nano-fiber mineral materials (NR powder) are employed to incorporate into cement-based materials. According to the grain grading mathematical model of cement-based materials, two packing systems, namely, spherical grading system and nano-fiber reinforced system were designed. Properties and interfacial microstructure of the two systems were studied according to secondary interface theory. It was shown that nano-fiber mineral materials can improve the grain grading of the admixture, increase the density of the system, improve the microstructure of the interface and the hardened paste, and enhance the uniformity of cement-based materials mixed with composite micro-grains and greatly increase their wearable rigidity and flexure strength. In this paper, two kinds of interface models, including spherical grain model and nano-fiber reinforced interface model of the cement-based materials mixed with composite micro-grains, were brought forward.
文摘A plane-symmetric inhomogeneous cosmological model of perfect fluid distribution with electro-magnetic field is obtained. F12 is the non-vanishing component of electromagnetic field tensor. To get a deterministic solution, we assume the free gravitational field is Petrov type-Ⅱ non-degenerate. Some physical and geometric properties of the model are also discussed.
文摘In this paper we give a characterization of planar lattices, and show that the sublattice L C Zn corresponding to the Hibi ideal of a finite distributive lattice L has a nice lattice basis if and only if L is planar. We also consider the Grobner basis of the lattice basis ideal attached to the planar lattices.
文摘The authors investigate the stability of a steady ideal plane flow in an arbitrary domain in terms of the L^2 norm of the vorticity. Linear stability implies nonlinear instability provided the growth rate of the linearized system exceeds the Liapunov exponent of the flow. In contrast,a maximizer of the entropy subject to constant energy and mass is stable. This implies the stability of certain solutions of the mean field equation.
文摘A two-phase elasto-plastic material is investigated. It is shown that, if the interface is modeled as the limit of a vanishing layer of a third material, then the resulting two-phase material will exhibit a smaller interracial dissipation than that of a pure two- phase model.
基金supported by National Natural Science Foundation of China (Grant Nos. 11171235,11071176,11071173 and 11221101)Specialized Research Fund for the Doctoral Program of Higher Education (Grant No. 20100181110071)the Fundamental Research Funds for the Central Universities of China (Grant No. SWJTU12BR028)
文摘In this paper,we study the global singular symplectic flops related to the following affine hypersurface with cyclic quotient singularities,Vr,b={(x,y,z,t)∈C4|xy-z2r+t2=0}/μr(a,-a,b,0),r 2,where b=1 appears in Mori’s minimal model program and b=1 is a new class of singularities in symplectic birational geometry.We prove that two symplectic 3-orbifolds which are singular flops to each other have isomorphic Ruan cohomology rings.The proof is based on the symplectic cutting argument and virtual localization technique.
基金The Science and Technology Plan Project of Tibet Autonomous Region(Z2016C01G01/04/03)
文摘The Yarlung Tsangpo River,the longest river in Tibet,houses most of the population and economy in Tibet Autonomous province.Under the rapid development of economy and society in Tibet,the pollution in the Yarlung Tsangpo River basin has rapidly increased.Evaluating water quality and water environmental capacity is needed for water resource management in Tibet.This study used a single factor evaluation method to evaluate water quality of the Zhongba-Nyingchi section of the Yarlung Tsangpo River based on measured data of CODcr, NH3-N and TP in the study area.Based on these data,determinations of ideal water environmental capacity, emissions of pollutants and remaining water environmental capacity of the study area were made by a one-dimensional steady water quality model under either section-head control or cross-section control.The data indicate that most of the monitoring sections in the study area experienced good water quality.The three pollutants all had large remaining water environmental capacity generally,but TP exceeded state levels in the two upstream functional areas,and levels above state standards of CODcr and TP were found in several calculation cells of the two downstream functional areas.Therefore,emissions of pollutants need to be reduced to protect the water environment quality of the Yarlung Tsangpo River.
文摘This paper studies a class of variational problems which involving both bulk and surfaceenergies. The bulk energy is of Dirichlet type though it can be in very general forms allowingunknowns to be scalar or vectors.The surface energy is an arbitrary elliptic parametric integralwhich is defined on a free interface. One also allows other constraints such as volumes of partitioning sets. One establishes the existence and regularity theory, in particular, the regularityof the free interface of such problems.
文摘China has entered a new era in our march toward the rule of law,and the principal contradiction facing Chinese society has changed into one between the people’s evergrowing need for a better life and unbalanced and inadequate development.At the rule of law level,the contradiction manifests itself as a gap between the public’s expectations of rule of law construction and its unbalanced and inadequate development in legislation,law enforcement,the judicial system,legal compliance,legal supervision,etc.The Report to the 19th National Congress of the Communist Party of China points out that law-based governance is an essential requirement and important guarantee for socialism with Chinese characteristics.It outlines an impressive blueprint for building the rule of law in the new era,and further expounds the basic strategy for building the rule of law in China in the future.It provides the guiding ideology and program of action for the comprehensive rule of law and establishes the goal of building the rule of law.Under the guidance of Xi Jinping thought on socialism with Chinese characteristics for a new era,rule of law construction in China will embark on a new journey.
