The efficiency of the working process of a forestry primer with a hydraulic drive of a rotor-thrower

An analysis of the conducted studies of the causes of occurrence, methods and techniques used to combat and prevent a forest fire, including forest plows, ditchers and soil throwers, is presented. It has been established that units with active working bodies are the most effective, but the existing milling working bodies do not allow delivering the required amount of soil to the edge of a forest ground fire. The aim of the study is to increase the efficiency of the working process of a forest fire soil thrower by substantiating the parameters of a three-stage rotor-thrower with a hydraulic drive. A mathematical model of the working process of a three-stage rotor-thrower and a software package were compiled, with the help of which the main design and technological parameters of the soil-throwing unit were determined. Laboratory tests were carried out using the method of a full-factorial experiment. The optimal value of the angle of installation of the blades on the rotor-thrower in terms of the volume of thrown soil of 0.1 m3 per one m2 of the area of the mineralized strip is the angle of -10º, however, in terms of energy consumption, the optimal angle of inclination of the blades for all modifications of the rotor is an angle equal to 00. As a result of a comparative analysis by the method of alternatives it was found that the optimal modification of the rotor-thrower is R-20 at a rotation frequency of 20 rpm

The efficiency of the working process of a forestry primer with a hydraulic drive of a rotor-thrower

An analysis of the conducted studies of the causes of occurrence, methods and techniques used to combat and prevent a forest fire, including forest plows, ditchers and soil throwers, is presented. It has been established that units with active working bodies are the most effective, but the existing milling working bodies do not allow delivering the required amount of soil to the edge of a forest ground fire. The aim of the study is to increase the efficiency of the working process of a forest fire soil thrower by substantiating the parameters of a three-stage rotor-thrower with a hydraulic drive. A mathematical model of the working process of a three-stage rotor-thrower and a software package were compiled, with the help of which the main design and technological parameters of the soil-throwing unit were determined. Laboratory tests were carried out using the method of a full-factorial experiment. The optimal value of the angle of installation of the blades on the rotor-thrower in terms of the volume of thrown soil of 0.1 m3 per one m2 of the area of the mineralized strip is the angle of -10º, however, in terms of energy consumption, the optimal angle of inclination of the blades for all modifications of the rotor is an angle equal to 00. As a result of a comparative analysis by the method of alternatives it was found that the optimal modification of the rotor-thrower is R-20 at a rotation frequency of 20 rpm

Magnetic field and nuclear spin influence on the DNA synthesis rate

Abstract The rate of a chemical reaction can be sensitive to the isotope composition of the reactants, which provides also for the sensitivity of such “spin-sensitive” reactions to the external magnetic field. Here we demonstrate the effect of the external magnetic field on the enzymatic DNA synthesis together with the effect of the spin-bearing magnesium ions ( $$^{25}$$ 25 Mg). The rate of DNA synthesis monotonously decreased with the external magnetic field induction increasing in presence of zero-spin magnesium ions ( $$^{24}$$ 24 Mg). On the contrary, in the presence of the spin-bearing magnesium ions, the dependence of the reaction rate on the magnetic field induction was non-monotonous and possess a distinct minimum at 80–100 mT. To describe the observed effect, we suggested a chemical scheme and biophysical mechanism considering a competition between Zeeman and Fermi interactions in the external magnetic field