## Search

Now showing items 241-250 of 266

#### Quiescence: A mechanism for escaping the effects of drug on cell populations

(2011-12-31)

We point out that a simple and generic strategy in order to lower the risk for extinction consists in developing a dormant stage in which the organism is unable to multiply but may die. The dormant organism is protected ...

#### Stress induced polarization switching and coupled hysteretic dynamics in ferroelectric materials

(2011-12-31)

The dynamic responses of ferroelectric materials upon external mechanical and electrical stimulations are inherently nonlinear and coupled. In the current paper, a macroscopic differential model is constructed for the ...

#### Chemical-garden formation, morphology, and composition. I. Effect of the nature of the cations

(2011-12-31)

We have grown chemical gardens in different sodium silicate solutions from several metal-ion salts-calcium chloride, manganese chloride, cobalt chloride, and nickel sulfate-with cations from period 4 of the periodic table. ...

#### Global dynamics of a cell mediated immunity in viral infection models with distributed delays

(2011-12-31)

In this paper, we investigate global dynamics for a system of delay differential equations which describes a virus-immune interaction in vivo. The model has two distributed time delays describing time needed for infection ...

#### A model for stem cell population dynamics with regulated maturation delay

(2011-12-31)

We develop a structured population model for the maturation process of stem cells in the form of a state-dependent delay differential equation. Moreover, results on existence, uniqueness and positivity of solutions as well ...

#### Meso-GSHMC: A stochastic algorithm for meso-scale constant temperature simulations

(2011-12-31)

We consider the problem of time-stepping/sampling for molecular and meso-scale particle dynamics. The aim of the work is to derive numerical time-stepping methods that generate samples exactly from the desired target ...

#### Permanence and global stability of a class of discrete epidemic models

(2011-12-31)

In this paper we investigate the permanence of a system and give a sufficient condition for the endemic equilibrium to be globally asymptotically stable, which are the remaining problems in our previous paper (G. Izzo, Y. ...

#### Monotone iterative techniques to SIRS epidemic models with nonlinear incidence rates and distributed delays

(2011-12-31)

In this paper, for SIRS epidemic models with a class of nonlinear incidence rates and distributed delays of the forms βS(t)∫0hk(τ)G(I(t-τ) )dτ, we establish the global asymptotic stability of the disease-free equilibrium ...

#### Chemical-garden formation, morphology, and composition. II. Chemical gardens in microgravity

(2011-12-31)

We studied the growth of metal-ion silicate chemical gardens under Earth gravity (1 g) and microgravity (μg) conditions. Identical sets of reaction chambers from an automated system (the Silicate Garden Habitat or SGHab) ...

#### Manipulation of single electron spin in a GaAs quantum dot through the application of geometric phases: The Feynman disentangling technique

(2010-12-31)

The spin of a single electron in an electrically defined quantum dot in a two-dimensional electron gas can be manipulated by moving the quantum dot adiabatically in a closed loop in the two-dimensional plane under the ...