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A statistical mechanical variational theory and an improved van der Waals one-fluid model have been used to compute the equation of state of fluid He+H2 mixtures with different H2:He compositions under high pressure. The first-order quantum correction is included. Comparing the present results with Monte Carlo simulations indicates that the quantum corrections for calculating the thermodynamic properties become increasingly important at lower temperatures. 相似文献
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用分子动力学方法和不同参数的指数 6势函数计算了T =30 4K的高密度氦的等温压缩线和能量分布 .给出了能精确描述高密度氦原子间相互作用的指数 6势函数优化参数 .并用优化的势函数计算了高密度氦T =30 0K和T =2 98K的等温压缩线 ,计算结果和实验值非常吻合 .进一步用优化的势函数模拟了高温高密度氦的状态方程及其结构 ,发现当把 ρ限定为 1 .6 0g /cm3 时 ,其径向分布函数的第 2个峰将在 2 0 0 0~ 30 40K区间消失 ,表明此时发生了固 液相变过程 . 相似文献
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Equation of State of the Fluid He-Ne Binary Mixtures at High Pressures and High Temperatures 下载免费PDF全文
The fluid variational free energy model is applied to calculate the equation of state (EOS) of the fluid (Ne/3,2He/3) mixtures at 296K. The pair potential is used to describe the He-Ne interaction. The calculated EOSs at 296Kare compared with the experiments for solid Ne(He)2. The validity of the potential and the calculated model is verified by comparison. The present model is extended to calculate the equation of state of the fluid He-Ne mixtures with different He:Ne compositions in the pressure 0-160 GPa and temperature up to 10000 K. 相似文献
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The Buckingham potential has been employed to simulate the melting and thermodynamic parameters of sodium chloride (NaCl) using the molecular dynamics (MD) method. The constant-volume heat capacity and Grüneisen parameters have been obtained in a wide range of temperatures. The calculated thermodynamic parameters are found to be in good agreement with the available experimental data. The NaCl melting simulations appear to validate the interpretation of superheating of the solid in the one-phase MD simulations. The melting curve of NaCl is compared with the experiments and other calculations at pressure 0-30GPa range. 相似文献
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就阻抗递变的多层组合飞片对靶样品的冲击压缩过程进行了一维平面应变数值模拟计算,其中,等熵线采用逐步递推法计算。以水和钽为靶的计算结果显示,这种多层组合飞片对水和钽均产生了很好的准等熵压缩效果。其中,对水的计算结果与国外文献报道的结果一致;计算的钽/氟化锂窗口界面速度历史与实验结果十分吻合。因此,用适当匹配的多层组合飞片对靶样品产生准等熵压缩是可行的,提出的准等熵压缩的数值模拟方法是可靠的。 相似文献
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