Methodology for determining the flow rate and temperature of generated hot water when calculating the thermal diagram of a hot water boiler room

The consumption and temperature of hot water produced by boiler units are calculated using such a quantity as the consumption of the consumed network water. The formulas represent functional dependencies connecting the obtained values not only with the consumption of heating water, but also with the consumption of hot water supplied for recirculation, for own needs and for the needs of the fuel economy. They take into account the losses of network and hot water. The formulas are obtained as a result of the joint solution of the equation for the total consumption of hot water and the equation for its partial costs.

Power Equipment Defects Prediction Based on the Joint Solution of Classification and Regression Problems Using Machine Learning Methods

Our paper proposes a method for constructing a system for predicting defects and failures of power equipment and the time of their occurrence based on the joint solution of regression and classification problems using machine learning methods. A distinctive feature of this method is the use of the equipment’s technical condition index as an informative parameter. The results of calculating and visualizing the technical condition index in relation to the electro-hydraulic automatic control system of hydropower turbine when predicting the defect “clogging of drainage channels” showed that its determination both for an equipment and for a group of its functional units allows one to quickly and with the required accuracy assess the arising technological disturbances in the operation of power equipment. In order to predict the behavior of the technical condition index of the automatic control system of the turbine, the optimal tuning of the LSTM model of the recurrent neural network was developed and carried out. The result of the application of the model was the forecast of the technical condition index achievement and the limiting characteristic according to the current time data on its values. The developed model accurately predicted the behavior of the technical condition index at time intervals of 3 and 10 h, which made it possible to draw a conclusion about its applicability for early identification of the investigated defect in the automatic control system of the turbine. Thus, we can conclude that the joint solution of regression and classification problems using an information parameter in the form of a technical condition index allows one to develop systems for predicting defects, one significant advantage of which is the ability to early determine the development of degradation phenomena in power equipment.

Students’ Perception About the Use of Mobile Learning in Solving Engineering Problems Collaboratively

The study is devoted to the possibility of using mobile learning for the joint solution of engineering problems by students. The research aims to determine the feasibility and perceived effectiveness of the collaborative method. The survey involved 218 students from five universities located in Russia and Kazakhstan. The results of the study show that 99% of young people have a smartphone or other mobile devices enabling Internet access, as confirmed by the study. The majority of students (85%) believe that mobile devices can be used for learning; 65% of the young people surveyed had already used a mobile phone or tablet to study disciplines. 44% of students determine the effectiveness of this type of learning and 56% were against it. In the context of the possibility of joint solution of engineering problems through these devices, opinions were almost equally divided: 52% of students agreed and 48% of participants disagreed. The practical significance can be based on the opportunities of the use of mobile learning for the joint solution of engineering problems. The research results may be of interest to a wide range of specialists working in the field of education, as well as to developers of training programs and applications.

One-Step Synthesis of Bimetallic Cobalt–Palladium Nanoparticles and a Carbon Support Based on Pyrolyzed Chitosan

A procedure is proposed for synthesizing monometallic (Co, Pd) and bimetallic Co–Pd nanoparticles immobilized in a carbon support based on pyrolyzed chitosan. A feature of the procedure is the simultaneous formation of metal nanoparticles and a carbon support during the heat treatment of a precursor based on a joint solution of a polymer and metal compounds under the effect of IR radiation. The phase composition, morphology of samples, and structural features of the carbon support are shown, depending on the nature of the metals that are used.

Features of processes in a microwave discharge in water vapor

A zero-dimensional steady-state simulation of microwave discharge in water vapor at atmos-pheric and reduced pressures and a constant gas temperature has been carried out. A model of a continuous stirring reactor is used. A joint solution of the balance equations for neutral and charged plasma components, the Boltzmann equation for plasma electrons, and the equation for the stationary distribution of the microwave field in a volume filled with plasma is carried out. The dependences of various parameters of thedischarge (the magnitude of the microwave field, the concentrations of all components) on the input specific power WVare obtained. It is shown that at reduced pressure the magnitude of the microwave field in the plasma is signifi-cantly lower, and the electron concentration is higher than at atmospheric pressure at the same applied specific power. At atmospheric pressure the water plasma is electronegative, and quasi-neutrality is maintained by the negative OH-ion in the range of the considered WV values. Transition from electronegative to electropositive plasma occurs at pressure of 30 Torr and ap-plied specific power of 60–70 kW/cm3

Mediation as an Anthroposociocultural Value

The article examines the phenomenon of mediation as a value of a developed civil society from the ideological and methodological positions of the anthroposociocultural approach. The general historical conditions of the emergence of mediation and its anthroposociocultural code, paradigmatic types of mediation and the most important properties of each of them are analyzed. The article reveals the value nature of mediation as a Copernican revolution in ideology and methods of constructive resolution of conflicts between individuals and their communities. The conclusions are substantiated that: mediation belongs to the genus of anthroposociocultural values as their qualitatively distinguished type; mediation is functionally related to fundamental universal human values - human rights, the rule of law and pluralistic democracy - as a tool for their protection by human beings themselves in the form of a joint solution of interpersonal conflicts by their own carriers with the help of professional mediators; modern science distinguishes at least two paradigmatically different types of mediation - traditional mediation and narrative mediation; mediation of the first type as a value is applied mainly to the solution of interpersonal conflicts, and mediation of the second type is mainly applied to the solution of conflicts between human communities in polyidentical societies.

Mathematical model of radiation-induced conductivity in quartz under the influence of high-power X-ray radiation

A model of generation and dynamics of radiation conductivity in quartz under the action of powerful soft X-ray radiation is constructed. The charge carrier dynamics model is based on the joint solution of self-consistent kinetic equations and Maxwell's equations. The model was verified by comparing the current calculations on the quartz surface with experiments on the Angara-5-1 thermonuclear installation. The current over the surface of the quartz sensor generated by a powerful pulse of soft X-ray radiation from the Angara-5-1 setup was taken as experimental data.

Physicochemical method of fixing mobile sands with local materials

Impregnating composition with water-soluble binders has been elaborated, with the help of which the source of deflation of mobile sands is blocked, and the protective crust obtained on the sandy surface is characterized by resistance to the effects of wind-sand flow, assessed by plastic strength and thickness. The free-flow movement of a binder in a porous body of sand depends mainly on the equivalent diameter of the particles obtained by the joint solution of the internal and external problems of hydrodynamics and the shape factor of the particles. To interpret the experimental results empirically, an indicator of the saturation of the protective crust sand characterizing the impregnation as an unstable process proceeding under the predominant influence of the gravity field with an uneven movement of the liquid front was revealed. The prevalence of the elastic-plastic properties of the protective crust is evidenced by a slight and smooth change in physical and mechanical indicators over time by the third year of operation.