List of publications on a keyword: «density»

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.

In article there are discussed the basic results of theoretical investigating continuous ultra-dispersed powder materials pressing process for obtaining lengthy products with nano-crystal structure. Within the framework of the hypothesis about similarity under stress conditions in compressible and incompressible materials in the pressing channel, the pressure distribution along the pressing channel is established. Using G.M. Zhdanovich equation with new material density distribution boundary conditions along the length of the pressing channel is found.

The peculiarities of urbanizing processes in rural regions are offered in the article. Their ulterior properties are defined. Regarding such peculiarities of Russian rural regions’ urbanization, it is recommended to assign a status of towns to a more urbanized rural regions, and a status of urban-type settlements to a less urbanized ones.

Three-phase systems and processing of materials in them have very wide spread occurance. As authors note, the main advantage of three-phase systems is high extent of extraction of a target component

The properties of a composition based on modified polyethylenes have been studied in the work. Polyolefin thermoplastic elastomers were obtained on the basis of ethylene-propylene elastomers and high-density polyethylene by the two methods: in the first case, as a modifying agent sulfur-containing compounds (altax, sulfur) were used, and in the second – MAC. Thermoplastic elastomers of the series A were obtained as a result of a combination of the original polymer components melt on the mill rolls at a temperature of 433–453 K° at the gap between them 0.2 mm. After crystalline thermoplastic melting ethylene copolymer problemby EPS and structuring agents were added. To achieve a good homogenization milling was carried out for 25 minutes. Formulation of the compositions had the following composition (pts. wt): EPDM – 100; HDPE – 10–80; dicumyl peroxide 1–2.

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.

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 article describes the influence of various methods of increasing silver penetration with impulse laser welding. The objective of the research was to achieve optimum defocusing in critical energy laser radiation for impulse laser welding of silver samples of various thicknesses.

In field experiments it was tasked to pick an effective system oto protect of spring rape crops from weeds, allowing to receive stable high productivity from commodity rapeseeds. Evaluation of productivity and suitability for the cultivation of oilseeds on commodity and seeds in the region of the Middle Urals in nine cases of intensification of the use of plant protection products in order to evaluate and use in a production environment. It was found that the studied drugs have unequal impact on the growth and development of plants and yield formation.