A non-equilibrium model of multicomponent melt solidification has been developed in which a Stefan problem with two boundaries is solved numerically, the boundaries being between the solid phase and the two-phase tran...A non-equilibrium model of multicomponent melt solidification has been developed in which a Stefan problem with two boundaries is solved numerically, the boundaries being between the solid phase and the two-phase transition zone and between the two-phase transition zone and the liquid phase. The two-phase zone is represented as a porous medium with variable porosity. The additional force resisting the melt flow due to porosity and introduced by analogy with Darcy＇s law is taken into account. Computer simulation has been performed of the experiment on Sn-20 wt.%Pb binary alloy solidification by the method of downward-directed crystallization along the gravity vector. The paper shows the results of a quasi two-dimensional benchmark experiment on horizontal （i.e., at the right angle to the gravity vector） directional solidification of a binary Sn-3 wt.%Pb alloy. The calculations were done using two crystallization models： the equilibrium model and the non-equilibrium one. It is shown that the non-equilibrium model gives a better description of the thermal field evolution and solute distribution caused by natural convection.展开更多
From the perspective of legal norms, the legal attributes of forensic testimony in the course of criminal proceedings are manifested in two forms： one is the collection of evidence; the other is the exercise of power...From the perspective of legal norms, the legal attributes of forensic testimony in the course of criminal proceedings are manifested in two forms： one is the collection of evidence; the other is the exercise of power. However, the values residing in these two legal attributes are not the same. The former emphasizes ＂justice,＂ and the latter, ＂efficiency.＂ An analysis of the legal norms governing forensic testimony in different periods shows that forensic testimony in criminal proceedings is gradually shifting from a pattern dominated by the exercise of power to one characterized by the collection of evidence. However, a genuine return to the essential character of forensic testimony as the collection of evidence must be premised on a change in the value orientation of the Criminal Procedure Law, that is, on a change from ＂efficiency＂ to ＂justice.＂展开更多
We introduce an adiabatic long-range quantum communication proposal based on a quantum dot array.By adiabatically varying the external gate voltage applied on the system,the quantum information encoded in the electron...We introduce an adiabatic long-range quantum communication proposal based on a quantum dot array.By adiabatically varying the external gate voltage applied on the system,the quantum information encoded in the electron can be transported from one end dot to another.We numerically solve the schr dinger equation for a system with a given number of quantum dots.It is shown that this scheme is a simple and efficient protocol to coherently manipulate the population transfer under suitable gate pulses.The dependence of the energy gap and the transfer time on system parameters is analyzed and shown numerically.We also investigate the adiabatic passage in a more realistic system in the presence of inevitable fabrication imperfections.This method provides guidance for future realizations of adiabatic quantum state transfer in experiments.展开更多
文摘A non-equilibrium model of multicomponent melt solidification has been developed in which a Stefan problem with two boundaries is solved numerically, the boundaries being between the solid phase and the two-phase transition zone and between the two-phase transition zone and the liquid phase. The two-phase zone is represented as a porous medium with variable porosity. The additional force resisting the melt flow due to porosity and introduced by analogy with Darcy＇s law is taken into account. Computer simulation has been performed of the experiment on Sn-20 wt.%Pb binary alloy solidification by the method of downward-directed crystallization along the gravity vector. The paper shows the results of a quasi two-dimensional benchmark experiment on horizontal （i.e., at the right angle to the gravity vector） directional solidification of a binary Sn-3 wt.%Pb alloy. The calculations were done using two crystallization models： the equilibrium model and the non-equilibrium one. It is shown that the non-equilibrium model gives a better description of the thermal field evolution and solute distribution caused by natural convection.
基金the Youth Project of the National Social Sciences Foundation"Linking Securies Administrative Punishment with Criminal Penalty"(No.11CFX048)support from the Project of the Institute of Foreign Law and Comparetive Law of East China University of Political Science and Law(No.SJ0709)the Disciplinary Building Project of Legal History of East China University of Political Science and Law(No.030102)
文摘From the perspective of legal norms, the legal attributes of forensic testimony in the course of criminal proceedings are manifested in two forms： one is the collection of evidence; the other is the exercise of power. However, the values residing in these two legal attributes are not the same. The former emphasizes ＂justice,＂ and the latter, ＂efficiency.＂ An analysis of the legal norms governing forensic testimony in different periods shows that forensic testimony in criminal proceedings is gradually shifting from a pattern dominated by the exercise of power to one characterized by the collection of evidence. However, a genuine return to the essential character of forensic testimony as the collection of evidence must be premised on a change in the value orientation of the Criminal Procedure Law, that is, on a change from ＂efficiency＂ to ＂justice.＂
基金support of the National Natural Science Foundation of China (Grant Nos. 10847150 and 11105086)the Shandong Provincial Natural Science Foundation (Grant Nos. ZR2009AM026 and BS2011-DX029)+1 种基金the Basic Scientific Research Project of Qingdao (Grant No.11-2-4-4-(6)-jch)the Basic Scientific Research Business Expenses of the Central University and Open Project of Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education,Lanzhou University (Grant No. LZUMMM2011001) for financial support
文摘We introduce an adiabatic long-range quantum communication proposal based on a quantum dot array.By adiabatically varying the external gate voltage applied on the system,the quantum information encoded in the electron can be transported from one end dot to another.We numerically solve the schr dinger equation for a system with a given number of quantum dots.It is shown that this scheme is a simple and efficient protocol to coherently manipulate the population transfer under suitable gate pulses.The dependence of the energy gap and the transfer time on system parameters is analyzed and shown numerically.We also investigate the adiabatic passage in a more realistic system in the presence of inevitable fabrication imperfections.This method provides guidance for future realizations of adiabatic quantum state transfer in experiments.
