This paper develops and estimates a two-factor model of intergenerational skill transmission when earnings inequality reflects differences in individual skills other non-skill shocks. We consider heterogeneity both initial growth rates, allowing variation to change over the lifecycle. Using administrative tax data on two linked generations Canadians covering 37 years, we exploit covariances log...

The discovery of topological insulators has opened new prospects for robust signal transport electronic, phononic, and photonic devices. Though protected edge states is to disorder, large fluctuations lengthened average delay time are observed. Here, we consider a quasi-1d system following the Haldane model generalize idea eigenchannel system. Eigenchannel indicates excited density configuratio...

The three relevant solutions of these equations are (i) (N T , N ∗ A) = (0, 0): this is the trivial case where both populations are zero. (ii) (N T , N ∗ A) = (K, 0): this solution describes a domain full with individuals that do not carry the trait; no trait-carrying individuals are present. (iii) (N T , N ∗ A) = (K,K − β/γ): this solution is the most interesting one for our purposes. It descr...

The outbreak of COVID-19 caused by SARS-CoV-2 in Wuhan and other cities China 2019 has become a global pandemic as declared the World Health Organization (WHO) first quarter 2020. delay diagnosis, limited hospital resources treatment led to rapid spread COVID19. Optimal control dynamical models with time-dependent functions are very powerful mathematical modeling tools investigate transmission ...