Study on modeling of the air ionization process in the technology of long-term storage of fruit and grape

This article presents the results of modeling the process of air ionization in the technology of long-term storage of fruits and grapes in fruit storage facilities.Also was determined the main forces acting on ions in the ionization zone, in the volume of the fruit storage and on the surface of the processed product in order to establish the ionization modes and design the discharge gap of the ionizer. Based on the results of the research, the issues of the ionizer placement in the volume of the fruit storage have been resolved. The results of theoretical studies have been verified experimentally and the corresponding dependencies of the parameters of ionized air was obtained.

Improving Monitoring of Radiation Pulses at the Industrial Facilities

In case of accidents at the industrial facilities, where there are devices that are a source of ionizing radiation, a significant part of the fission products is in a vaporous and aerosol state. There is no sharp drop in the radiation levels, which means that the terrain can be damaged for a long time and become uninhabitable. To assess the damage and eliminate the consequences of exposure to a hard radiation pulse, it is required to have such systems that register the dose fields in real time with a high temporal resolution and do not require regular verification and reference to the reference fields. To solve the problem, it is proposed to measure the dose rate of pulsed radiation by the induced conductivity in the air. This makes it possible to obtain the absolute values of the dose rate without reference to the reference fields, with a time resolution of 1·108 per second. The relationship between conductivity of the ionized air and the dose rate is given by means of experimentally determined constants: mobility of the electrons in the air and the lifetime of electrons before they stick to oxygen molecules in the air considering participation of the third particle. Proposed method is based on the microwave sounding of the highly ionized air. This allows to significantly expand the range of application of the ionization methods up to 1·108 Sv/s for photon radiation and to provide nanosecond time resolution. In the present experiments, the time dependence of the dose rate on time obtained by high-frequency probing was measured, and the dose per pulse was found by integrating over time. Measurement results were compared with the readings of a certified integral thermoluminescent dosimeter based on LiF. Measurement results indicate agreement within 20–30 %. High-frequency detectors can be used as part of information and measurement systems to alert about possible emergencies. The method allows obtaining final information in real time and forming management teams on mitigation of emergency situations consequences.

SCIENTIFIC SUBSTANTIATION OF OPTIMIZATION OF HYDROAEROINE AIR COMPOSITION IN PUBLIC PREMISES FOR PERSONS WITH SPECIAL NEEDS

The purpose of this work is scientific substantiation and optimization of hydroaeroionic composition of air in public places to create safe living and working conditions for people with special needs using a modern ultrasonic ionizer. Measurements were performed by the developed method using an air saion counter "Sapphire 3K" and using a thermoanemometer TM-4001. To perform the analysis of experimental research data, the method of mathematical planning of the experiment according to the scheme of rotatable central composite planning (RCCP) was used, which is based on regression analysis. The possibility of using for the process of hydroaeroionization of premises where there are people with special needs of saline solutions of different degrees of concentration to increase the concentration of negative ions has been investigated. Analysis of experimental data showed that increasing the concentration of saline solutions leads to a decrease in the intensity of formation of hydroaeroions in the room. Minimizing the mineralization of water will allow you to get the optimal concentration of hydroaeroions with artificial ionization of the room where people with disabilities are. Mathematical processing of the obtained data allowed to establish the combined effect of indoor air velocity (v) and distance to UGA (s) on the concentration of positive and negative aerons when using mineralized water of different degrees of concentration. The obtained result can be applied at designing and development of control system of the ultrasonic generator of air ions for the purpose of creation of the most comfortable high-quality ionized air in rooms where there are persons with special needs.: Synthesized regression models of concentrations of hydroaeroions, which describe the relationship between the velocity of air in the room and the distance to the ultrasonic generator of air ions during artificial ionization of rooms for people with special needs. The adequacy of the models is checked by the coefficient of determination, which proves the high level of correlation of the system coefficients.