In this paper,we study Liouville theorem for the 3D stationary Q-tensor system of liquid crystal in Lorentz and Morrey spaces.Under some additional hypotheses,stated in terms of Lorentz and Morrey spaces,using energy estimation,we obtain that the trivial solution u=Q=0 is the unique solution.Our theorems correspond to improvements of some recent results and contain some known results as particular cases.
PurposeThe susceptible-infectious-susceptible (SIS) infectious disease models without spatial heterogeneity have limited applications, and the numerical simulation without considering models' global existence and uniqueness of classical solutions might converge to an impractical solution. This paper aims to develop a robust and reliable numerical approach to the SIS epidemic model with spatial heterogeneity, which characterizes the horizontal and vertical transmission of the disease.Design/methodology/approachThis study used stability analysis methods from nonlinear dynamics to evaluate the stability of SIS epidemic models. Additionally, the authors applied numerical solution methods from diffusion equations and heat conduction equations in fluid mechanics to infectious disease transmission models with spatial heterogeneity, which can guarantee a robustly stable and highly reliable numerical process. The findings revealed that this interdisciplinary approach not only provides a more comprehensive understanding of the propagation patterns of infectious diseases across various spatial environments but also offers new application directions in the fields of fluid mechanics and heat flow. The results of this study are highly significant for developing effective control strategies against infectious diseases while offering new ideas and methods for related fields of research.FindingsThrough theoretical analysis and numerical simulation, the distribution of infected persons in heterogeneous environments is closely related to the location parameters. The finding is suitable for clinical use.Originality/valueThe theoretical analysis of the stability theorem and the threshold dynamics guarantee robust stability and fast convergence of the numerical solution. It opens up a new window for a robust and reliable numerical study.
本文研究了保积BiHom-李color三系T的广义导子代数GDer(T)的定义及其一些重要性质.利用BiHom-李三系的广义导子的研究方法,构造出保积BiHom-李color三系T的拟导子代数QDer(T)、型心C(T)、拟型心QC(T)和中心导子代数ZDer(T).证明了中心导子代数ZDer(T)是 Der(T)的 BiHom-理想,并且证明了[C(T),QC(T)]⊆ End(T,Z(T)),特别地,若 Z(T)={0},则[C(T),QC(T)]={0}.
本文研究一类带有记忆项的双阻尼σ-发展方程的柯西问题.借助方程线性问题的衰减估计,利用压缩映像原理证得小初值问题解的整体存在性.同时考虑初值积分为正的情形,利用检验函数方法得到解的爆破以及生命跨度上界的估计.推广了带有双阻尼项的σ-发展方程的有关结论.
本文基于岭估计研究了正态线性回归模型中未知参数的最小体积置信集问题.利用Jackknife方法,获得了在不同情况下未知参数的最小体积置信集.最后,与经典置信集进行比较,在最小体积意义下我们所得到的置信集是最佳的.
