PARTIAL DIFFERENTIAL EQUATIONS IN APPLIED SCIENCES

Knowing how to construct and understand mathematical models that describe qualitatively and quantitatively some phenomena related to the environment. Knowing how to use the main concepts of differential equation theory for application in the biological, geological and environmental fields. Knowing how to predict and justify the evolution of simple phenomena, described by ordinary differential equations, related to the biological, geological and environmental sciences.

Direct Instruction.

The lessons are integrated with exercises related to the topics covered by the course and will take place in the classroom. It should also be noted that there are 42 hours of lessons.

Should teaching be carried out in mixed mode or remotely, it may be necessary to introduce changes with respect to previous statements, in line with the program planned and outlined in the Syllabus.

NOTE: Information for students with disabilities and/or SLD

To guarantee equal opportunities and in compliance with the laws in force, interested students can ask for a personal interview in order to plan any compensatory and / or dispensatory measures, based on the didactic objectives and specific needs.

It is also possible to contact the referent teacher CInAP (Center for Active and Participated Integration - Services for Disabilities and / or SLD) of our Department, prof. Giuseppina Alongi).

Differential and Integral Calculus. Basic Analytic Geometry.

Recommended.

1. Ordinary differential equations and systems of ordinary differential equations. Differential equations: definition and terminology. First-order differential equations: separable equations and first-order linear equations. Lagrange's method of variation of the constant. Cauchy's problem. Systems of ordinary differential equations: definition and terminology. Existence and uniqueness of the solution of a system of ordinary differential equations. Systems of linear differential equations. Autonomous systems of linear differential equations. Homogeneous systems of linear differential equations, eigenvalues, eigenvectors and solutions. Systems of nonlinear ordinary differential equations: autonomous systems, stability of systems of linear ordinary differential equations, linearization and local stability, stability criteria for nonlinear first-order differential equations and for autonomous plane systems.
2. Partial differential equations. Classifications. Partial differential equations in the Applied Sciences. Superposition principle. Boundary value problems. Classical PDEs: heat equation, wave equation, Laplace's equation. Some remarks on nonhomogeneous boundary value problems. Orthogonal Series Expansions. Problems in polar coordinates: introduction, steady temperatures in a circular plate, steady temperatures in a semicircular plate. Problems in cylindrical coordinates: introduction, radial vibrations of a circular membrane, standing waves, Laplacian in cylindrical coordinates, steady temperatures in a circular cylinder. Problems in spherical coordinates: introduction, Laplacian in spherical coordinates, steady temperatures in a sphere.
3. Physical models. Elementary dynamics of the Earth's Mantle. Climate and paleoclimate: types of models, global climate models, dynamics of glacial masses, climatic oscillators. Viscous gravitational currents: theory of lubrication and advancement of a lava front.
4. Models for pollution. Models for pollution. Models for atmospheric pollution: model of the transport of pollutants, model of transport and diffusion of pollutants, control of the propagation of pollutants in the atmosphere, hints on the model for the construction of plants and control of polluting emissions, interaction of pollutants. Models for water pollution: structure and classification of models, one-dimensional model and its analytical solutions, equation, some remarks on multi-dimensional models.

1. S. Motta, M.A. Ragusa, A. Scapellato – Methods and mathematical models - ed. CULC (2020)
2. N. Hritonenko, Y. Yatsenko - Mathematical Modeling in Economics, Ecology and the Environment. Second edition – Springer (2013).
3. A. Fowler – Mathematical Geoscience – Springer (2011).
4. Lecture notes.

Oral examination. Criteria for assigning the final grade: verification of the achievement of the educational objectives expressed through the European Descriptors of the qualification. Verification of learning can also be carried out electronically, should the conditions require it.

Ordinary differential equations and systems of ordinary differential equations; partial differential equations and their applications; physical models; models for pollution.