Інституційний репозитарій Миколаївського НАУ

The article considers the problem of controlling the concentration of ethylene during fruit storage, which critically affects their ripening and quality preservation. The authors propose a new high-precision system for indirect determination of ethylene content based on changes in the dielectric permittivity of the air medium. The methodology is based on a resonant method with a frequency discriminator operating on an open resonator with a frequency autotuning system. Transient processes are ...

The paper considers the current problems of the development of open resonators (ORs), which are widely used in modern RF and microwave systems of spectroscopy, quantum electronics, sensors and communications. Particular attention is paid to the influence of power losses — diffraction, ohmic and excitation-related — on the Q-factor and efficiency of ORs. It is shown that accurate modeling of the coupling coefficients of slot elements is a complex task that requires simplified theoretical model...

Modern Ukrainian society has been in conditions of active military operations for several years, which have caused disruption of sleep patterns, lack of proper rest, and a sense of security, which has led to a state of chronic stress. The main role in protecting the body from stress factors, regulating sleep, and implementing adaptive reactions belongs to the pineal gland and the hormone it synthesizes – melatonin. However, prolonged exposure to stress factors leads to disruption of the funct...