47,119 research outputs found
A Comparison of Teaching Models in the West and in China
Models of teaching commonly used in the West and in China are analyzed and compared, using an analytical approach that systematically considers different aspects of the models. The purpose of the exploration is three-fold: (a) to create better understanding of both Chinese and Western models, for mutual insight and to strengthen the development of pedagogical theory building in China; (b) to guide a joint project between the Netherlands and China relative to the development computer-related learning resources for China; and (c) to contribute to better overall understanding of how instructional resources can be adapted for use in both Western and Chinese situations. The analysis provides a contribution for each of these goals
Global unique solvability of inhomogeneous Navier-Stokes equations with bounded density
In this paper, we prove the global existence and uniqueness of solution to
d-dimensional (for ) incompressible inhomogeneous Navier-Stokes
equations with initial density being bounded from above and below by some
positive constants, and with initial velocity for in
2-D, or satisfying |u_0|_{L^2}|\na u_0|_{L^2} being
sufficiently small in 3-D. This in particular improves the most recent
well-posedness result in [10], which requires the initial velocity for the local well-posedness result, and a smallness condition on
the fluctuation of the initial density for the global well-posedness result
Thermophysical properties of liquid carbon dioxide under shock compressions: Quantum molecular dynamic simulations
Quantum molecular dynamic simulations are introduced to study the dynamical,
electrical, and optical properties of carbon dioxide under dynamic
compressions. The principal Hugoniot derived from the calculated equation of
states is demonstrated to be well accordant with experimental results.
Molecular dissociation and recombination are investigated through pair
correlation functions, and decomposition of carbon dioxide is found to be
between 40 and 50 GPa along the Hugoniot, where nonmetal-metal transition is
observed. In addition, the optical properties of shock compressed carbon
dioxide are also theoretically predicted along the Hugoniot
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