radiographic evaluation of the third molar tooth to determine its position and degree of development is an important part in diagnosis and treatment planning, as well as in forensic dentistry procedures. the objective was to investigate the developmental stages of third molars in relation to chronologic age, gender and location (maxillary/mandibular) in an iranian population.the data were colle...

We consider a branching process with Poissonian immigration where individuals have inheritable types. At rate θ, new individuals singly enter the total population and start a new population which evolves like a supercritical, homogeneous, binary Crump-Mode-Jagers process: individuals have i.i.d. lifetimes durations (non necessarily exponential) during which they give birth independently at cons...

Models based on stage structure have found varied applications in population models. This paper proposes a stage structured model to study the trends in the computer and video game playing population of US. The game paying population is divided into three compartments based on their age group. After simulating the mathematical model, a forecast of the number of game players in each stage as wel...

The fundamental question in both basic and applied population biology of whether a species will increase in numbers is often investigated by finding the population growth rate as the largest eigenvalue of a deterministic matrix model. For a population classified only by age, and not stage or size, a simpler biologically interpretable condition can be used, namely whether R0, the mean number of ...

We analyze a stage-structured biomass model for size-structured consumer-resource interactions. Maturation of juvenile consumers is modeled with a food-dependent function that consistently translates individual-level assumptions about growth in body size to the population level. Furthermore, the model accounts for stage-specific differences in resource use and mortality between juvenile and adu...

stagePop is an R package that can be used to model the deterministic dynamics and interactions of stage-structured populations. These are populations where the life cycle consists of distinct stages e.g. eggs, juveniles and reproductive adults. Explicitly including stage structure when modelling the population dynamics of stage-structured organisms can have an enormous effect on the resulting d...

For a stage-structured population model in periodic discrete habitat, with initial values it reduces to system of two differential equations time delay. Assuming the birth rate is unimodal type, we obtain influence delay on local and global dynamics. In particular, large leads vanishing. As decreases, found three critical for emergence different dynamics, by appealing combination monotone dynam...