中文摘要：

在一个二维的 Lennard-Jones 系统的煤气液体的阶段共存和分子的动力学模拟用麦克斯韦构造方法被调查。在潜力的不同截断的阶段共存的结果与从文学，和计算的相应批评性质获得的数据相比。当温度接近批评的点从，到吝啬的地行为的从象一样的转线路被观察并且证实在下面。有不同尺寸的系统上的表现模拟，我们比当这有限尺寸效果的最大程度被考虑时，在大多数以前的结果显示出的那些，和更低的批评温度被获得的发现有限尺寸效果是更重要的。

英文摘要：

The gas-liquid phase coexistence in a two-dimensional Lennard-Jones system is investigated using Maxwell construction method together with molecular dynamics simulations. The results of phase coexistence in different truncations of the potential are compared with data obtained from the literature, and the corresponding critical properties calculated. The crossover from Ising-like to mean field behavior is observed and confirmed as the temperature approaches the critical point from below. Performing simulations on systems with different sizes, we find that a finite size effect is more significant than those shown in most of the previous results, and a lower critical temperature is obtained when the full extent of this finite size effect is considered.