In this study, we examine a competitive Nicholson blowflies model with time-varying coefficients and continuous time delays. the case of coincidence degree theory, constructing appropriate Lyapunov functionals using several inequalities, conditions on extinction, periodic solution, permanence, global attractiveness system are derived. Finally, three examples numerical simulations presented to v...

We studied a host-parasite model qualitatively. The host-parasitoid is obtained by modifying the Nicholson-Bailey so that number of hosts parasitoids can't attack fixed. Topological classification equilibria achieved with implementation linearization. Furthermore, Neimark-Sacker bifurcation explored using theory normal forms at interior steady-state. in controlled implementing two control strat...

Z. Naturforsch. 48 a, 679-691 (1993); received February 17, 1993 This paper is dedicated to the memory of our friends and colleagues Christoph K. Goertz, Dwight R. Nicholson, Linhua Shan, and Robert A. Smith, who were tragically slain on November 1, 1991 A new base for three-dimensional divergence-free vector fields in Hilbert space (Galerkin method) is proposed. The base fields have vanishing ...

A numerical procedure based on the time-dependent Schrijdinger equation for the modeling of multidimensional mesoscopic devices is presented. The primary features of this numerical method are a tight-binding formulation of the quantum mechanical Hamiltonian, an alternating direction implicit generalization of the Crank-Nicholson method for solving the discretized multidimensional time-dependent...

In this paper, we obtain sufficient conditions for the permanence of a family nonautonomous systems delay differential equations. This includes structured models from mathematical biology, with either discrete or distributed delays in both linear and nonlinear terms, where typically terms are nonmonotone. Applications to generalized Nicholson Mackey-Glass given.

Disagreement exists on the taxonomic identity of extant populations Australian Elseya referred to in 1992 as gulf (= sp. aff. dentata [Nicholson]). The form has since 1997 been considered conspecific with late Pleistocene fossil lavarackorum (White and Archer, 1994). Recently it a new species, oneiros Joseph-Ouni et al., 2020, another found same site stratum . Here we re-examine material reasse...