The Two Regime method for optimizing stochastic reaction-diffusion simulations

The computer simulation of stochastic reaction-diffusion processes in biology is often done using either compartment-based (spatially discretized) simulations or molecular-based (Brownian dynamics) approaches. Compartment-based approaches can yield quick and accurate mesoscopic results but lack the level of detail that is characteristic of the more computationally intensive molecular-based models. Often microscopic detail is only required in a small region but currently the best way to achieve this detail is to use a resource intensive model over the whole domain. We introduce the Two Regime Method (TRM) in which a molecular-based algorithm is used in part of the computational domain and a compartment-based approach is used elsewhere in the computational domain. We apply the TRM to two test problems including a model from developmental biology. We thereby show that the TRM is accurate and subsequently may be used to inspect both mesoscopic and microscopic detail of reaction diffusion simulations according to the demands of the modeller

An analysis of the Mariner 4 photography of Mars

Crater analysis of Mariner 4 photography of Mar

Improving the Functional Control of Aged Ferroelectrics using Insights from Atomistic Modelling

We provide a fundamental insight into the microscopic mechanisms of the ageing processes. Using large scale molecular dynamics simulations of the prototypical ferroelectric material PbTiO3, we demonstrate that the experimentally observed ageing phenomena can be reproduced from intrinsic interactions of defect-dipoles related to dopant-vacancy associates, even in the absence of extrinsic effects. We show that variation of the dopant concentration modifies the material's hysteretic response. We identify a universal method to reduce loss and tune the electromechanical properties of inexpensive ceramics for efficient technologies.Comment: 6 pages, 3 figure

High temperature glass coatings for superalloys and refractory metals

New glasses are used as protective coatings on metals and alloys susceptible to oxidation at high temperatures in oxidizing atmospheres. Glasses are stable and solid at temperatures up to 1000 deg C, adhere well to metal surfaces, and are usable for metals with broad range of expansion coefficients

Development and evaluation of controlled viscosity coatings for superalloys

Controlled viscosity glass based protective coatings for superalloys for turbine blade application

Preacher\u27s Magazine Volume 03 Number 05

Sections: Editorial – “Redeeming the Time”; Doctrinal; Devotional; Homiletical, including Sermon Outlines; Practical. Cover: Ira D. Sankey.https://digitalcommons.olivet.edu/cotn_pm/1047/thumbnail.jp

Preacher\u27s Magazine Volume 02 Number 09

Sections: Editorial – “When Preaching Opposes Its Own Purpose”; Doctrinal; Devotional; Homiletical, including Sermon Outlines; Practical. Cover: George Whitefieldhttps://digitalcommons.olivet.edu/cotn_pm/1021/thumbnail.jp