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arXiv 1302.6987cond-mat.softcond-mat.stat-mech
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二元圆盘填料结构温度的测量

Measuring the configurational temperature of a binary disc packing

Song-Chuan Zhao, Matthias Schröter

摘要:

颗粒材料的堵塞填料不同于通常由统计力学描述的系统,因为它们是无热的。近年来出现了静态颗粒介质的统计力学,其中热力学温度被构型温度X所取代,该构型温度描述了机械稳定构型的数量如何取决于体积。已经提出了四种不同的方法来测量X。其中三个是计算的Voronoi体积分布的属性,第四个考虑到接触数和全球的体积分数。本文回答了两个问题,使用实验的二进制磁盘包装:首先,我们测试,如果四种方法来衡量紧凑性提供相同的结果时,适用于相同的数据集。我们发现,只有两种方法同意定量。其次,我们测试X是否确实是一个密集的变量;这只适用于大于大约200个粒子的样本。这一结果表明是由于最近发现的颗粒体积之间的相关性[Zhao等人,欧罗巴信件:2012,97,34004]。

英文摘要:

Jammed packings of granular materials differ from systems normally described by statistical mechanics in that they are athermal. In recent years a statistical mechanics of static granular media has emerged where the thermodynamic temperature is replaced by a configurational temperature X which describes how the number of mechanically stable configurations depends on the volume. Four different methods have been suggested to measure X. Three of them are computed from properties of the Voronoi volume distribution, the fourth takes into account the contact number and the global volume fraction. This paper answers two questions using experimental binary disc packings: First we test if the four methods to measure compactivity provide identical results when applied to the same dataset. We find that only two of the methods agree quantitatively. Secondly, we test if X is indeed an intensive variable; this becomes true only for samples larger than roughly 200 particles. This result is shown to be due to recently found correlations between the particle volumes [Zhao et al., Europhys. Lett., 2012, 97, 34004].

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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