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- Rasa Grigoliene, Donatas Svitra
- Informatica, Lith. Acad. Sci.
- 2000

This article is an introduction to the simplest mathematical model, which describes the hormone interaction during the menstrual cycle. Modifications of the mathematical model of the menstrual cycle including the mathematical model with the time delay depending on function researched and the mathematical model with the dispersed time delay are researched… (More)

- Igor Basov, Donatas Svitra
- Informatica, Lith. Acad. Sci.
- 2000

A system of two nonlinear difference-differential equations which is a mathematical model of self-regulation of glucose level in blood with time delay into consideration of insulin "age structure" is presented. The analysis carried out by qualitative and numerical methods allows us to conclude, that the mathematical model explains the functioning of the… (More)

- Jolanta Januteniene, Donatas Svitra
- Informatica, Lith. Acad. Sci.
- 2001

In the practice of metal treatment by cutting it is frequently necessary to deal with selfexcited oscillations of the cutting tool, treated detail and units of the machine tool. In this paper are presented differential equations with the delay of self-excited oscillations. The linear analysis is performed by the method of D-expansion. There is chosen an… (More)

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