不同退火条件对(Hg,Tl)-1223热电势率的影响

我们测量了Ｈｇ０９Ｔｌ０．２Ｂａ２Ｃａ２Ｃｕ３Ｏ８＋δ的热电势率与温度的关系，并着重研究了不同退火条件对其超导电性及热电势率的影响．结果表明：室温热电势率Ｓ（２９０Ｋ）与ＣｕＯ２平面的空穴浓度ｐ及超导转变温度Ｔｃ的关系，与Ｊ．Ｌ．Ｔａｌｏｎ等人对Ｙ系、Ｂｉ系及Ｔｌ系高温超导材料给出的结果一致．因此热电势率可提供高温超导材料内空穴浓度ｐ的信息．     

Motile parameters of cell migration in anisotropic environment derived by speed power spectrum fitting with double exponential decay

Cell migration through anisotropic microenvironment is critical to a wide variety of physiological and pathological processes.However,adequate analytical tools to derive motile parameters to characterize the anisotropic migration are lacking.Here,we proposed a method to obtain the four motile parameters of migration cells based on the anisotropic persistent random walk model which is described by two persistence times and two migration speeds at perpendicular directions.The key process is to calculate the velocity power spectra of cell migration along intrinsically perpendicular directions respectively,then to apply maximum likelihood estimation to derive the motile parameters from the power spectra fitting with double exponential decay.The simulation results show that the averaged persistence times and the corrected migration speeds can be good estimations for motile parameters of cell migration.     

Derivation of persistent time for anisotropic migration of cells

Cell migration plays an essential role in a wide variety of physiological and pathological processes. In this paper we numerically discuss the properties of an anisotropic persistent random walk(APRW) model, in which two different and independent persistent times are assumed for cell migrations in the x-and y-axis directions. An intrinsic orthogonal coordinates with the primary and non-primary directions can be defined for each migration trajectory based on the singular vector decomposition method. Our simulation results show that the decay time of single exponential distribution of velocity auto-correlation function(VACF) in the primary direction is actually the large persistent time of the APRW model, and the small decay time of double exponential VACF in the non-primary direction equals the small persistent time of the APRW model. Thus, we propose that the two persistent times of anisotropic migration of cells can be properly estimated by discussing the VACFs of trajectory projected to the primary and non-primary directions.