广义不可逆四库等温化学势变换器的最优性能

建立受传质不可逆性、质漏以及内部耗散等多种不可逆性影响的一类广义不可逆四库等温化学势变换器的新循环模型,用有限时间热力学或热力学优化理论导出了循环的泵能率和性能系数间的基本优化关系,得到了最大性能系数及相应泵能率和最大泵能率及相应性能系数．分析了各不可逆性对循环性能的影响,结果表明质漏对化学势变换器性能有定性和定量的影响,而内部耗散仅有定量的影响．所得结论可为电化学、光化学、质量交换器及固态设备等的参数优化和性能改善提供新的理论指导．     

Analytic Method to Study Influence of Finite Chemical Potential in QED3

Adopting the approximation to the first order of chemical potential μ, we resolve rigidly the influence on fermion condensate from μ in QED3. We show that this condensate does not respond linear expression to μ. Moreover, the influence on fermion chiral condensate from chemieal potential is investigated.     

Calculation of Quark-Number Susceptibility at Finite Chemical Potential and Temperature

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.     

The Renormalized Equation of State and Quark Star

By means of the EOS of QCD at zero temperature and finite quark chemical potential we proposed [Phys. Rev. D 78 （2008） 054001] in the framework of rainbow-ladder approximation of Dyson-Schwinger approach, we investigate the structure of quark star and its property. It is found that the mass-radius relation in our model is very different from that of usual quark star models, but similar to neutron star models. The obtained mass of quark star is about 1.75M⊙- 2.2M⊙. The obtained radius of quark star is 22 - 26 km, which is obviously larger than the results in other models. The reason for this discrepancy is analyzed.     

均匀微弱电场对带电费米子体系热容量和化学势的影响

从统计物理半经典(Thomas-Fermi)近似方法出发,研究均匀微弱电场中带电费米子体系的热力学性质,推导出了带电费米子体系的热容量和化学势随外电场场强的变化关系,给出了体系的热容量和化学势在高温和低温近似下的解析表达式,进而分析了均匀微弱电场对带电费米子体系热容量和化学势的影响.     

Au在Hg_(1-x)Cd_xTe材料中p型掺杂的第一性原理研究

利用基于密度泛函理论的第一性原理方法,研究了Au在Hg1-xCdxTe材料中原位取代Hg的p型掺杂对材料各组分电子结构的影响.通过态密度、形成能和动力学能级的理论分析,系统讨论了分子外延(MBE)和液相外延(LPE)两种生长条件下,Au杂质p型掺杂的稳定性和有效性.结果表明Au原位取代Hg后,Hg1-xCdxTe材料一方面表现出相当好的稳定性,另一方面形成浅杂质能级,是一种有效的p型掺杂剂.讨论了生长气氛对Au在Hg1-xCdxTe(MCT)中p型掺杂效率的影响,发现在MBE生长条件下,富阳离子气氛的所有组分,富Te气氛的0.75x≤1组分以及LPE生长富阳离子条件下的0.75≤x≤1组分的MCT材料中均存在Au杂质的自补偿效应,不适合进行Au的p型掺杂.     

深入认识电化学势及电化学势判据

摘要 从电化学势和热力学第二定律的关系入手,导出了基于电化学势的电化学过程方向判据,即从热力学第二定律的高度对电化学势判据进行了再认识,避免了直接把热力学第二定律Gibbs判据中的化学势改为电化学势去说明问题的错误做法,澄清了电化学系统只有可逆过程而无平衡状态的错误概念,并在此基础上对相关的电化学问题进行了讨论,说明了电化学势概念在电化学基础理论中的重要性。     

Chemical Potential Dependence of Two-Quark Condensates

By adopting the background field method, the response of the dressed quark propagator to the presence of finite chemical potential is analysed up to the second order. From this, we obtain a model-independent formula for the chemical potential dependence （up to the second order） of the in-medium two-quark condensate and show by both Lorentz covariance arguments and explicit calculations that the O（μ） contribution to the in-medium two-quark condensate vanishes identically.     

共振粒子的化学势和粒密度、能密度

研究了相对论重离子碰撞中产生的共振物质的统计性质，讨论了共振粒子的化学势和净粒子密度的关系. 计算了总粒子密度和能量密度，研究和分析了他们和净粒子密度的关系，并估算了总粒子密度相对于正常核密度(0.16fm－3)的倍数；在RHIC能量约为5-8倍，在SPS能量约为3-6倍. 还研究了各种粒子成分随温度的变化，揭示出几个温度区间段对应AGS、SPS和RHIC三个能区，各区间中主要粒子成分分别为重子、奇异子和介子.