https://sci.ldubgd.edu.ua/jspui/handle/123456789/340 2026-04-07T04:04:21Z https://sci.ldubgd.edu.ua/jspui/handle/123456789/724 Title: Взаємозв’язок між температурою та часом до займання хвої молодих соснових насаджень Authors: Товарянський, Володимир Ігорович; Кузик, Андрій Данилович; Петровський, Віталій Львович Abstract: The research of the ignition temperature of the needles of young pine plantations during the drying process has been made. Dependences of temperature and time of ignition of needles on time of drying during 7 days under laboratory conditions were received. The property of decrease values of both studied parameters during the time of drying was detected. According to experimental results the average values of ignition temperature and time before young pine needles ignition were obtained. Was etermined the values of temperature and time on the first and last day of research, respectively. Dependencies of ignition temperature and time to ignition of young pine needles than drying time are best approximated by polynomial. Are found the errors between the values obtained during the experiment and models. 2015-01-01T00:00:00Z https://sci.ldubgd.edu.ua/jspui/handle/123456789/723 Title: Оцінювання інтенсивності теплового потоку від поверхні полум’я Authors: Кузик, Андрій Данилович; Трусевич, Оксана Мирославівна; Сало, Тетяна Михайлівна Abstract: The heat flux from the surface of the flame under the laws of thermal radiation is distributed in space and heating nearby objects and people. On the intensity of heat flow depends on precautions to protect firefighters: type of protective clothing, stay near the hearth fire and others. Therefore, an important task is to evaluate this value for different cases of flame surface and exposure surface mutual accommodation. We obtain analytical dependence of the intensity of the heat flux from the surface of the flame in the shape of a rectangle to the surface from a distance, height and flame size 2015-01-01T00:00:00Z https://sci.ldubgd.edu.ua/jspui/handle/123456789/722 Title: Оценка влажности хвои сосны обыкновенной как фактора пожарной опасности по измерению ее диэлектрической проницаемости Authors: Кузик, Андрій Данилович; Товарянський, Володимир Ігорович Abstract: Aim: To carry out an evaluation of pine needles moisture content, an important factor which contributes to fire hazards as a result of dielectric properties. Such an evaluation facilitates a speedy diagnosis of a fire hazard in pine forests An analysis was performed on the impact of physical and chemical properties of pine needles on the potential fire hazard Introduction: Moisture content of pine needles has an impact on properties associated with fire hazards. Traditional moisture deter - mining methods consume much time and require specialist pre-calibrated measuring instruments and techniques. Therefore, the article proposes a method of evaluating pine needles moisture content, based on dielectric permittivity principles, expressed by the capacitance of a capacitor containing pine needles located between its plates. Project and methods: Experimental studies of dry pine needles were performed in a laboratory. Pine needles were stored at the constant air temperature of 20 ± 1°С and relative humidity of 46 ± 2% until uniform moisture content was achieved. Subsequently, the pine needles were dried for 2 hours, in an oven, at a temperature of 100 ± 5°C. The moisture content of pine needles was determined for each day of research by weighing , using laboratory scales. The dielectric permittivity of pine needles was evaluated with the aid of a flat capacitor, by placing a specified number of pine needles between its plates. This capacitor was connected to a capacitance measuring device . Statistical analysis methods and corresponding software were used for data processing. Results: Dielectric permittivity changes were mapped using changes to the capacitor’s capacitance, with pine needles located between its plates. Identified the dependence relationships between moisture content of pine needles and drying time, as well as capacitance of the capacitor containing pine needles and drying time. Capacitance is proportional to dielectric permittivity, therefore, dielectric permittivity falls in parallel with a decrease in moisture content. Using regression analysis, linear and polynomial trends were identified , describing the dependence relationship between moisture content of needles and capacitance. Direct quantification of dielectric permittivity of pine needles is complicated by the presence of air among pine needles located between plates. Therefore diagnosis of a fire hazard should be performed using capacitance of a capacitor with pine needles between its plates rather than dielectric permittivity. Conclusions: Evaluation of pine needles moisture content, with pines located between the plates of a capacitor, has an impact on the capacitor’s capacity, which facilitates a speedy prediction of fire hazard levels 2015-01-01T00:00:00Z