In order to optimize the ductility of orthorhombic Ti2AlNb-based alloys sheet,Ti22Al27Nb sheet was treated by high density electropulsing（J max =6.80 7.09 kA/mm2,tp =110 μs） under ambient condition.Microstructures ...In order to optimize the ductility of orthorhombic Ti2AlNb-based alloys sheet,Ti22Al27Nb sheet was treated by high density electropulsing（J max =6.80 7.09 kA/mm2,tp =110 μs） under ambient condition.Microstructures were observed by SEM,and the tensile properties were also studied using uniaxial tension tests.The experimental results show that electropulsing can refine the microstructures of Ti22Al27Nb sheets.The specimen with the fine and homogeneous microstructures has good plasticity,and its elongation reaches 19.4%.The mechanism about the effect of electropulsing treatment on the microstructure of Ti22Al27Nb sheets was discussed.It was thought that the increase in nucleation rate during phase transformation and a very short treating time were regarded as the main reasons of producing smaller grains and increase in the plasticity by electropulsing.展开更多
In this paper, by using holomorphic support f unction of strictly pseudoconvex domain on Stein manifolds and the kernel define d by DEMAILY J P and Laurent Thiebaut, we construct two integral operators T q and S q whi...In this paper, by using holomorphic support f unction of strictly pseudoconvex domain on Stein manifolds and the kernel define d by DEMAILY J P and Laurent Thiebaut, we construct two integral operators T q and S q which are both belong to C s+α p,q-1 (D) and ob tain integral representation of the solution of (p,q)-form b-equation on the boundary of pseudoconvex domain in Stein manifolds and the L s p,q extimates for the solution.展开更多
The processes of nucleation and growth of lead from the dilute electrolytes on copper substrates were investigated bychronoamperometry and by scanning electron microscopic (SEM) analysis of the deposits obtained in th...The processes of nucleation and growth of lead from the dilute electrolytes on copper substrates were investigated bychronoamperometry and by scanning electron microscopic (SEM) analysis of the deposits obtained in the potentiostatic regime ofelectrolysis. In the dependence of electrodeposition conditions, the nucleation of Pb followed either progressive or instantaneoustype. The type of nucleation changed from progressive to instantaneous one with increasing the concentration of Pb(II) ions and theoverpotential of electrodeposition. Regardless of the type nucleation, a novel type of Pb particles like cobweb was formed by thepotentiostatic electrodeposition in the moment of nucleation and at the early stages of growth. On the basis of the shape ofcobweb-like particles and the electrodeposition conditions leading to their formation, these particles were situated in the group ofspongy-like ones. Also, comparative morphological analysis of Pb deposits obtained in the conditions of progressive andinstantaneous nucleation confirmed the existence of two limiting types of nucleation.展开更多
In this work we suggestion new methods investigation the model Volterra type integral equation with logarithmic singularity, kernel which consisting from composition polynomial function with logarithmic singularity an...In this work we suggestion new methods investigation the model Volterra type integral equation with logarithmic singularity, kernel which consisting from composition polynomial function with logarithmic singularity and function with singular point. The problem investigation this type integral equation at n = 2m reduce to problem investigate the Volterra type integral equation （1） for n = 2 the theory for which was constructed in [2]. In this work, we investigation integral equation （1） at = 2m ＋ 1 In this case, we investigate integral equation （1） reduction it＇s to m integral equation type [2] φ（x）＋∫xa[p1＋p2 ln（x-a/t-a）]φ（t）/t-a dt=f（x）and one the following integral equation [1] ω（x）＋p3∫xω（t）/ a t-adt=g（x）.展开更多
The authors obtain a holomorphic Lefschetz fixed point formula for certain non-compact “hyperbolic” Kǎihler manifolds （e.g. Kǎihler hyperbolic manifolds, bounded domains of holomorphy） by using the Bergman kerne...The authors obtain a holomorphic Lefschetz fixed point formula for certain non-compact “hyperbolic” Kǎihler manifolds （e.g. Kǎihler hyperbolic manifolds, bounded domains of holomorphy） by using the Bergman kernel. This result generalizes the early work of Donnelly and Fefferman.展开更多
基金Project(50875061) supported by the National Natural Science Foundation of ChinaProject(20092302110016) supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China
文摘In order to optimize the ductility of orthorhombic Ti2AlNb-based alloys sheet,Ti22Al27Nb sheet was treated by high density electropulsing（J max =6.80 7.09 kA/mm2,tp =110 μs） under ambient condition.Microstructures were observed by SEM,and the tensile properties were also studied using uniaxial tension tests.The experimental results show that electropulsing can refine the microstructures of Ti22Al27Nb sheets.The specimen with the fine and homogeneous microstructures has good plasticity,and its elongation reaches 19.4%.The mechanism about the effect of electropulsing treatment on the microstructure of Ti22Al27Nb sheets was discussed.It was thought that the increase in nucleation rate during phase transformation and a very short treating time were regarded as the main reasons of producing smaller grains and increase in the plasticity by electropulsing.
文摘In this paper, by using holomorphic support f unction of strictly pseudoconvex domain on Stein manifolds and the kernel define d by DEMAILY J P and Laurent Thiebaut, we construct two integral operators T q and S q which are both belong to C s+α p,q-1 (D) and ob tain integral representation of the solution of (p,q)-form b-equation on the boundary of pseudoconvex domain in Stein manifolds and the L s p,q extimates for the solution.
基金supported by the Ministry of Education,Science and Technological Development of the Republic of Serbia under the research project:“Electrochemical synthesis and characterization of nanostructured functional materials for application in new technologies”(Project No.172046)
文摘The processes of nucleation and growth of lead from the dilute electrolytes on copper substrates were investigated bychronoamperometry and by scanning electron microscopic (SEM) analysis of the deposits obtained in the potentiostatic regime ofelectrolysis. In the dependence of electrodeposition conditions, the nucleation of Pb followed either progressive or instantaneoustype. The type of nucleation changed from progressive to instantaneous one with increasing the concentration of Pb(II) ions and theoverpotential of electrodeposition. Regardless of the type nucleation, a novel type of Pb particles like cobweb was formed by thepotentiostatic electrodeposition in the moment of nucleation and at the early stages of growth. On the basis of the shape ofcobweb-like particles and the electrodeposition conditions leading to their formation, these particles were situated in the group ofspongy-like ones. Also, comparative morphological analysis of Pb deposits obtained in the conditions of progressive andinstantaneous nucleation confirmed the existence of two limiting types of nucleation.
文摘In this work we suggestion new methods investigation the model Volterra type integral equation with logarithmic singularity, kernel which consisting from composition polynomial function with logarithmic singularity and function with singular point. The problem investigation this type integral equation at n = 2m reduce to problem investigate the Volterra type integral equation （1） for n = 2 the theory for which was constructed in [2]. In this work, we investigation integral equation （1） at = 2m ＋ 1 In this case, we investigate integral equation （1） reduction it＇s to m integral equation type [2] φ（x）＋∫xa[p1＋p2 ln（x-a/t-a）]φ（t）/t-a dt=f（x）and one the following integral equation [1] ω（x）＋p3∫xω（t）/ a t-adt=g（x）.
基金supported by the Program for New Century Excellent Talents in University of China (No. 050380)the Grant for Chinese Excellent Doctorate’s Degree Thesis (No. 200519)the Fok Ying Tung EducationFoundation and the National Natural Science Foundation of China (No. 10871145).
文摘The authors obtain a holomorphic Lefschetz fixed point formula for certain non-compact “hyperbolic” Kǎihler manifolds （e.g. Kǎihler hyperbolic manifolds, bounded domains of holomorphy） by using the Bergman kernel. This result generalizes the early work of Donnelly and Fefferman.
