Fingering in Stochastic Growth Models

نویسندگان

  • Andreas C. Aristotelous
  • Richard Durrett
چکیده

Motivated by the widespread use of hybrid-discrete cellular automata in modeling cancer, two simple growth models are studied on the two dimensional lattice that incorporate a nutrient, assumed to be oxygen. In the first model the oxygen concentration u(x, t) is computed based on the geometry of the growing blob, while in the second one u(x, t) satisfies a reaction-diffusion equation. A threshold θ value exists such that cells give birth at rate β(u(x, t) - θ)+ and die at rate δ(θ - u(x, t)+. In the first model, a phase transition was found between growth as a solid blob and "fingering" at a threshold θc = 0.5, while in the second case fingering always occurs, i.e., θc = 0.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Stochastic pore-scale growth models of DNAPL migration in porous media

Stochastic models that account for a wide range of pore-scale e€ects are discussed in the context of two-phase, immiscible displacement problems in natural porous media. We focus on migration of dense, nonaqueous phase liquids (DNAPLs) through watersaturated geological materials. DNAPL movement is governed by buoyancy, capillary, and viscous forces, as well as by the details of the porous mediu...

متن کامل

Diffusion-Limited Aggregation on Curved Surfaces

We develop a general theory of transport-limited aggregation phenomena occurring on curved surfaces, based on stochastic iterated conformal maps and conformal projections to the complex plane. To illustrate the theory, we use stereographic projections to simulate diffusionlimited-aggregation (DLA) on surfaces of constant Gaussian curvature, including the sphere (K > 0) and pseudo-sphere (K < 0)...

متن کامل

Automatic Piano Reduction from Ensemble Scores Based on Merged-Output Hidden Markov Model

We discuss automated piano reduction from ensemble scores based on stochastic models of piano fingering and reduction process. Music arrangement including piano transcription is an important compositional technique, automation of which creates a challenging research field. As a starting point, we aim at a simple case of piano reduction which is playable and sounds similar to the original ensemb...

متن کامل

Modeling for fingering patterns with an assembly of splitting elements

For the purpose of understanding fingering patterns, we propose a simple model system composed of splitting elements where we regard a tip of each finger as a basic dynamical unit. Numerical simulations of the model reproduce turbulent states, fractal and tree-like structures and spatiotemporal intermittency which are all quite similar in behavior to real systems. keywords: fingering patterns, ...

متن کامل

Application of semi-analytic method to compute the moments for solution of logistic model

The population growth, is increase in the number of individuals in population and it depends on some random environment effects. There are several different mathematical models for population growth. These models are suitable tool to predict future population growth. One of these models is logistic model. In this paper, by using Feynman-Kac formula, the Adomian decomposition method is applied to ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Experimental mathematics

دوره 23 4  شماره 

صفحات  -

تاریخ انتشار 2014