List of publications on a keyword: «temperature»

A theoretical estimate of the dependence of ultimate strength on the physical properties of a solid substance—such as density, molecular weight, melting point, and enthalpy of fusion—has been obtained. This dependence explains how these properties influence the material’s strength based on the “unpacking” concept of substance matter. The physical limits of applicability for the concept of “force” in Newtonian mechanics, and its distinction from the “unpacking” concept, are substantiated. This dependence, while similar in form to the Clapeyron-Mendeleev equation for an ideal gas, has a different physical interpretation when applied to the ultimate strength of a solid. The calculated dependence was compared with tabulated data on the ultimate strength of 15 industrial metals. This model allows for the explanation and prediction of ultimate strength values for metals in the periodic table.

This article brings together previously published evidence of the unified nature of physical processes and phenomena in terms of changes in the energy of a substance molecule. The unified physical nature of all these physical phenomena has been proven, as a single multistage process of energetic unpacking of molecules of a substance, which is logical to call the molecular-energy concept of unpacking a substance. The considered processes include the following processes. Surface rupture, characterized by the surface tension coefficient. The melting process of a substance characterized by its melting point. A boiling process characterized by the boiling point. Evaporation (and condensation) process characterized by internal energy and enthalpy as well as critical point. The conclusions of the theory are confirmed by well-known empirical dependences and by reference books of the physical properties of simple substances: internal energy, enthalpy, surface tension, melting point, boiling point and critical point.

This article discusses the manifestation of dangerous hydrometeorological processes in the Central Federal district. The analysis of manifestation dynamics of these dangers is carried out. The dependences of the hazardous processes cases number in general and by categories of on the temperature regime consequences are considered in the article. It was found out that within areas where average annual temperature exceeds annual temperature in the Central Federal district the number of hurricanes and heavy rains exceeds the average value, and the number of cases leading to negative consequences associated with blizzards and snowfall well below their average long-term manifestations, but the number of floods above their average values. The algorithm of calculation of forecast economic damages from manifestation of hydrometeorological dangers is offered.

In this paper, the authors propose a new approach to the consideration of the friction phenomenon in HEAs and, in particular, dry friction. An equation is obtained that shows the nonlinear dependence of the friction coefficient on Gibbs energy G0, on temperature T, on the concentration of the number of electrons N and which allows predicting the formation of high entropy alloys and coatings.

The article discusses the question of temperature rising on the example of author’s home region and temperature’s effect on a global warming.

PetrSU forms knowledge bases for the synthesis of patentable solutions in various sectors of the economy. Initial development of the knowledge base in the field of industrial use of low-temperature plasma.

Based on the experience of Petrozavodsk University in the field of knowledge base formation, an overview of inventions and patents for utility models patented in 2017 in Russia in the field of industrial use of low-temperature plasma was made.

In the article the analysis of shortcomings of existing methods of determining the technical condition of small refrigerating machines and their subsystems on the basis of which developed a method of assessing the technical condition of the small refrigerating machine, based on the determination of the rate of change of temperature in the chambers

According to the properties of melting points and boiling points of the elements of the periodic table of D.I. Mendeleyev the application of the unpacking hypothesis of the substance was verified. The article contains the results of the verification. In general, according to the data for 98 substances taken from the information in Internet, convergence of results with an error of up to 40% for 73 substances was obtained. The effect of periodicity on the result is found. An exception to the calculated dependences was obtained for ten substances: noble gas and most halogens. A large discrepancy between the theoretical formulas and the reference data was also caused by the 14 elements of the middle groups.

A wide range of applications of low-temperature plasma in industry and in the social sphere is shown. An opinion was expressed on the underestimation of the potential of low-temperature plasmas in forestry and in the timber industry. It is advisable to use low-temperature plasma for presowing treatment of forest seeds.

The possibility of using the liquid density depending on the temperature for the organization of its movement along a closed pipeline. An assessment of the energy performance of thermal energy conversion process in the kinetic energy of the flow.

In order to maintain a healthy state of circular sawing machines the author proposed to use pyrometric means of temperature control. The conditions, method of calculation and prediction model of the temperature drop of the round of wood cutting saws in the process of sawing wood have been determined.

The paper deals with the dynamic development of the heating elements and their use in modern thermal equipment for low temperature cooking of meat products.

The experimental studies of density distribution of the particles of a mixture of wheat, oats, rye to feed pigs by infrared heating at the time of stay and temperature at the exit of the installation. The purpose of the work is to study the quality of treatment of the product with the settings with the screw and the screw with installed round jumper on the pen of the screw. Screw installations with infrared emitters of selected wavelength give the opportunity for intense and continuous heat treatment process. The authors used the optimal parameters of the process with the screw and the screw with installed round jumper on the pen of the screw. The parameters of screw installation during the study were the following: the number of revolutions of the screw was 10 rpm, density of heat flux was 12 kW/m2, output capacity – 250 kg/h.

The paper deals with the effectiveness of the single well heat exchanger for extraction of deep heat energy of the bowels of the Earth. The classification of renewable sources of energy is presented. The authors describe the subsurface temperature regime on the territory of Russia and give definition to the concept of temperature reduction because of the use of the single well heat exchanger. The results of computational and parametric study of the single well heat exchanger are presented.

According to the author “atom” is a microsystem. The ability of photons (γνc – “nucleon”) to rotate at the speed of light in the microsystem (atom) ring – through – ring reveals the cause of inorganic matter formation. Gravity is a total apogee of the rotation of nucleons γνc in the microsystems (atoms). The article shows the new energy technologies instead of nuclear power and hydrocarbons, and their main aim which is the hydrogen energy radiation. The researcher notes that the speed of space journey can become relatively similar to the speed of light.

We received theoretical formulas of the interconnection between melting, boiling and critical temperatures. Uniform physical representation of melting, boiling and evaporation processes was the basis for deriving the formula of interconnection between them. We use the concept of the material substance internal energy in terms of the molecules “unpacking” idea. The reference manual data on 85 substances from 13 to 855 degrees Kelvin confirms the theoretically derived formulas. We carried out the comparison of theoretical formulas and experimental data by their mean values. A simple ideal substance model with spherical molecules was considered as a model of substance molecule. The melting point is 1/3, and the boiling point ranges from 1/2 to 2/3 of the critical point for this model.

We consider the rules on labor protection, permitted hours at temperatures below freezing, and the effect on non-compliance with the inventory error