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We use the direct method proposed by He et al. [Phys. Lett. B 680 (2009) 432) to calculate the quark-number susceptibility (QNS) at finite temperature and the chemical potential in the quasi-particle model. In our approach the QNS is given by a formula solely involving the dressed quark propagator at finite chemical potential μ and temperature Τ. The QNS at finite μ and Τ is calculated in the quasi-particle model. It is found that at high temperatures the QNS tends to the ideal quark gas result. At very small temperatures the QNS vanishes. This vanishing behavior in the low-temperature region is consistent with the lattice results. For μ∈ [0,180] MeV, our results show that there exists a rapid increase of QNS near some temperatures. The temperature at which the rapid increase occurs shifts to smaller values with the increasing quark chemical potential. This rapid increase could be regarded as a signal of a crossover. 相似文献
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一个计算正烷烃沸点的公式 总被引:1,自引:0,他引:1
正烷烃(直链饱和烃)的一般分子式是C_?H_(2?+2),从碳的原子数n计算它们的沸点T°K(T是正常沸点℃+273.15℃),历来有许多经验公式发表过。本论文新提出一个公式是: 相似文献
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本文从工程地质中节理连通率的概念出发, 对有一组节理非常发育的不连续岩体建立了力学模型并推导了计算公式, 进而对边坡潜在滑动面在静水压力作用下从节理错动到岩桥剪断、从局部破裂到整体滑动逐步演化成滑动面的全过程进行了数值模拟和力学分析, 得到了有参考价值的结论。 相似文献
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