arXiv subjects

Marianito R. Rodrigo

Publications and source records attributed to Marianito R. Rodrigo.

3 recordsLinked to original sources

arXiv2021

A unified way to solve IVPs and IBVPs for the time-fractional diffusion-wave equation

The time-fractional diffusion-wave equation is revisited, where the time derivative is of order $2 ν$ and $0 < ν\le 1$. The behaviour of the equation is "diffusion-like" (respectively, "wave-like") when $0 < ν\le \frac{1}{2}$ (respectively, $\frac{1}{2} < ν\le 1$). Two types of time-fractional derivatives are considered, namely the Caputo and Riemann-Liouville derivatives. Initial value problems and initial-boundary value problems are investigated and handled in a unified way using an embedding method. A two-parameter auxiliary function is introduced and its properties are investigated. The time-fractional diffusion equation is used to generate a new family of probability distributions, and that includes the normal distribution as a particular case.

math.AP↗

arXiv2021

A spatio-temporal analogue of the Omori-Utsu law of aftershock sequences

A spatio-temporal version of the well-known Omori-Utsu law of aftershock sequences is proposed. This 'diffusive Omori-Utsu law' satisfies a nonlinear partial differential equation (PDE). A similarity reduction is obtained that reduces the PDE to an ordinary differential equation (ODE). A nonzero constant solution of this ODE leads to the usual Omori-Utsu law. An exact and explicit similarity solution is found that corresponds to the original Omori law. An initial value problem for the 'diffusive Omori-Utsu law' is also considered, and whose spatio-temporal dynamics are described by bounding functions that satisfy nonlinear, but linearisable, PDEs. Numerical results are also provided.

physics.geo-ph↗

arXiv2014

Model for Acid-Mediated Tumour Invasion with Chemotherapy Intervention I: Homogeneous Populations

The acid-mediation hypothesis, that is, the hypothesis that acid produced by tumours, as a result of aerobic glycolysis, provides a mechanism for invasion, has so far been considered as a relatively closed system. The focus has mainly been on the dynamics of the tumour, normal-tissue, acid and possibly some other bodily components, without considering the effect of an external intervention such as a cytotoxic treatment. This article aims to examine the effect that a cytotoxic treatment has on a tumour growing under the acid-mediation hypothesis by using a simple set of ordinary differential equations that consider the interaction between normal-tissue, tumour-tissue, acid and chemotherapy drug.

q-bio.CB↗