population 
On the differentiability of the parity progressive population semigroup


We are concerned with the differentiability of the parity progressive population semigroup under certain weak assumptions.


We prove by studying the properties of the spectrum of the parity progressive operator of population that there existst0>amp;gt;0 such that the parity progressive population semigroup {T(t): t≥0} is differentiable ift>amp;gt;t0


In this paper, we present a simple and direct approach in which supermartinagles are used to approximate the optimal stopping sets associated with the Bayesian sequential test for normal population means.


For von Mises population M(μ,k), we find that six bootstrap confidence intervals are secondorder correct like the approximate normal confidence interval, and STUDinterval is thirdorder correct.


Analysis of an SIS epidemiologic model with variable population size and a delay


Epidemiologic model of SIS type has a delay corresponding to the infectious period and diseaserelated deaths, so that the population size is variable.


The population dynamics structure is recruitment and natural births with natural deaths.


The persistence of the infectious disease and diseaserelated deaths can lead to a new equilibrium population size below the carrying capacity.


Optimal harvesting control problem for linear agedependent population dynamics


An optimal harvesting problem for linear agedependent population dynamics is investigated.


This paper considers an SIRS epidemic model that incorporates constant immigration rate, a general populationsize dependent contact rate and proportional transfer rate from the infective class to susceptible class.


This paper considers two differential infectivity (DI) epidemic models with a nonlinear incidence rate and constant or varying population size.


Moreover, when σ>amp;gt;1, the local or global asymptotical stability of endemic equilibrium for DI model with constant population size in ndimensional or twodimensional space is obtained.


Stability of an seis epidemic model with constant recruitment and a varying total population size


This paper considers an SEIS epidemic model with infectious force in the latent period and a general populationsize dependent contact rate.


A new adaptive mutation particle swarm optimizer, which is based on the variance of the population's fitness, is presented in this paper.


During the running time, the mutation probability for the current best particle is determined by two factors: the variance of the population's fitness and the current optimal solution.


involucrata population has a rich genetic diversity, and the differences among populations are significant.


This was done by determining the duration of each life stage of the mites, the intrinsic rate of population increase (rm), mean generation time (T) and net reproductive rate (R0) of the spider mites on each of the host plant species.

