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5. Symbolic models of physical processes described the Fredholm integral equation of the first kind

#### Symbolic models of physical processes described the Fredholm integral equation of the first kind

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Description: Differential taylorian transformations are used in this paper to create a series of symbolic models of physical processes that are appropriate to represent the Fredholm integral equation of the first kind, and demonstrate the advantages of using these transforms on three different models. The use of differential taylorian transforms reduces the solving of a complex problem to simpler, thereby reducing computational complexity, since it allows us to represent with an acceptable accuracy the complex inverse problem with a simpler model, a pronounced system of linear algebraic equations of small dimension. There was found unknown function of dispensing of electrical potential in semi-conductor with the help of differential transformation. The unknown function of dispensing is a higher bound of integration in integral equation of Fredholm of first kind. Assembled differential model of this equation that allow to find unknown function of dispensing of potential. With the help of differential taylorian transformations, error stabilized experimental data model, based on the Fredholm integral equations is also obtained, which is suitable for studying the thermophysical characteristics of the components of the vehicles' nodes, in particular the study of the thermal state of the engines; overheating of brake pads, bearing units, etc. In this case, the heat equation is a differential equation in partial parabolic derivatives. On the basis of differential transformations the symbolical model is developed for definition thermal characteristics of materials, in particular, parameter temperature conductivity steady against mistakes in initial data. The considered problem describes a high-temperature mode with ablation of weight of the fused substance, for example, the process of destruction of the protective layer of aerospace transport. The approach considered in this work can be used in other tasks, when physical processes should be considered in an integral form. The use of differential taylorian transforms allows you to reduce the complex task to a simpler, thereby reducing computational complexity.

Keywords: differential taylorian transformations, the Fredholm integral equation of the first kind, incorrectness, inverse coefficient problem of temperature-conductivity

#### References

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Reference:
﻿ Zasiadko, A.A. (2019), “Symvolichni modeli fizychnykh protsesiv, shcho opysuiutsia intehralnym rivnianniam Fredholma pershoho rodu” [Symbolic models of physical processes described the Fredholm integral equation of the first kind], Information Processing Systems, Vol. 2(157), pp. 45-56. https://doi.org/10.30748/soi.2019.157.06.