Use of binders with low water demand opens prospects for obtaining high-performance concretes. A polyfunctional modifier based on resol-type resorcinol-furfural oligomers allows one to obtain binders with low water demand and high specific surface area, compressive strength, and water-reducing ability....

The problem of reclamation of waste pits in oil fields is still being solved by a costly method. The accelerated technology of sludge dewatering with electroosmotic effect is proposed. The concept of specific energy inputs for mass transfer is introduced. To eliminate the influence of relaxation of gradient...

The paper overviews directions for electrotechnology treatment of grain seeds before sowing. The hypothesis of the germination enhancement of seeds if treated with corona discharge is presented here. Besides, the description of electrotechnology installation and facilities for it, including manufacturing...

It was proposed to use electrokinetic phenomena for the cultivation of agricultural products, taking into account the multifactority of technology and the presence of relaxation phenomena. It is forecasted to use new approaches to reduce energy costs for the process of moistening the root-layer of soil...

The article considers the problem of providing the necessary geometric parameters of the workspace of a flat robot with 3 degrees of freedom. The influence of the geometric parameters of the robot mechanism configuration (drive mechanisms rod lengths and working platform parameters) as well as the working...

The detection of fraud payments is one of the primary problems for cyber-security of payment services. Among all services, the exclusive ones are the payment systems of central banks regarding their critical role for financial systems, sheer volume and number of transactions and increased attention from...

The main independent controllable parameters in drilling oil and gas wells are the weight on bit and the frequency of bit rotation. When drilling deep directional wells with horizontal sections of the wellbore, the weight comes to the bottomhole with a delay due to increased frictional forces during...

We investigated an impact of technological conditions of oxidizing X12CrNiTi18-9 stainless steel implants in repeated heating-cooling cycles in the air on morphological features of resulting metal oxide coating. Our findings confirmed that generated coating had a high morphological heterogeneity of its...

Today, aviation simulators are complexes for training pilots flying an aircraft in normal situations and in pre-emergency situations. The pilot, piloting an aircraft simulator, manages an airplane model. The airplane model moves in a three-dimensional space model. The pilot monitors the movement of the...

The results of the experimental studies on the process of clinker grinding pre-crushed in a press roller mill and in a ball mill equipped with the energy exchangers are described in the article. The effect of clinker grinding pressure on the amount of deagglomeration forces of its compacted plates is...

The article gives detailed analysis of theoretical statements that exist nowadays and practice experience in the sphere of grinding materials to the nanosize. There is a technological scheme of the production of nanomaterials by the traditional method, which consists of two phases of grinding: pre-grinding...

The paper reveals regularity in solid phase materials property change depending on their capability of structural changes. A classification of technogenic waste is proposed that takes into account the condition of their production (biogenic, chemogenic, pyrogenic and mechanogenic) and nature of structural...

The article presents algorithms for the control of a robotic complex for building products using 3D printing, including a module for the main movements and a module for precise movements based on a robot with a cable drive. The description of software modules for the implementation of algorithms and...

This article presents the results of experimental and finite element analysis of mistuned free vibration of bladed disk models. Blade-to-blade variations of bladed disk assemblies result in local zoning of vibration modes as well as amplitude magnifications, which primarily reduces the high cycle fatigue...

Investigations of powder alloys of the Fe- (30-36)% Ni system based on carbonyl powders are presented. When studying the microstructure of Fe-(30-36)%Ni alloys, it was found that an increase in the concentration of nickel promotes the coarsening of the average grain size of the austenite, and the grain...

In the paper the main problems of power control strategies in series hybrid electric vehicles are discussed. Classical regulators are compared with neural networks, their advantages and disadvantages are shown. Experimental data sources for training neural networks and proofing results are suggested...

The problem of a steady power increase of electric equipment on the cars and the need for its daily operation emphasise the relevance of research, aimed at predicting the automotive batteries state of charge in order to ensure reliable starting of the engine at negative temperature. The purpose of the...

While studying, a new nanocomposite carbon-bearing sorbent (TMCO) has been obtained as a result of thermal modification of sugar industry waste - carbonatation sludge. TMCO is a combination of carbonate basis covered by coal nanoparticles. The nanostructured layer from the amorphous carbon is penetrated...

The article considers the influence of conditions in the well on the efficiency of layers' opening using perforation. The influence of the type of drilling muds and special liquids on the quality of secondary opening of productive layers was shown. The punched liquid was chosen during perforation and...

The article characterizes the essentials and peculiarities of digital economy and lists its basic technologies. A hybrid space, formed by means of integrating a virtual space component into a real one, serves as its basis. The article underlines that in hybrid space, an object can acquire the properties...

The developed mathematical and algorithmic non-linear electric signal models are presented via B-spline decomposition. The advantage of application of decomposition of B-spline data record tracing in comparison with the classical empiric mode decomposition method has been fully justified. The results...

When operating facilities of production, transportation, and storage of oil and oil products, the pollution of various objects of the natural environment happens quite often. The technogenic impact of hydrocarbons (HC) on the ground mass is of interest in two aspects at least. The first aspect is the...

Paper deals with investigation of induction electrical machines winding based on matrix description. The possibility to use such method for creation of new winding structures and properties prediction at the designing stage are discussed. The software implementing the approach suggested is also presented....

The article deals with finding the optimal floatation conditions for the final tailings of wet magnetic separation. To solve the problem, several laboratory tests were made using a floatation machine, which helped to determine the needed reagent composition, temperature and time of reverse cationic floatation....

In the context of dense urban development, it is challenging to assess possible risks for buildings and structures being influenced by construction work, especially in the historical part of the city where historical and cultural properties and architectural monuments are located [10-12]. The paper presents...

The article considers the mathematical model for calculating the magnetic circuit of a multipolar synchronous motor with fractional single-toothed winding and permanent magnets. The mathematical model is based on the technique of the tooth contours conductivity. The obtained model makes it possible to...

There are different types of the inside-the-pool flooding: dividing the deposit by injectors into lines, circles, creating a central row of dividing injection wells with several rows, going across, and those that are combined with marginal flooding. The injector pattern depends on the field's geological...

The performed studies show that application of only one parameter for assessing structure service life does not allow accurately determining time of limit state occurrence. That is why emergencies, leading to the structure damage, right after assessment of technical state of the facility are present....

Technogenic hydrates are mostly a negative factor in the oil and gas industry. Their formation in the bottomhole well zone and in wellbores complicates the extraction, reducing their production rate. In the hydrocarbons collection systems, the hydrates in certain thermobaric conditions deposit on the...

To ensure smooth operation of grinding equipment, it is necessary to regulate oil parameters of oil-pumping stations used for greasing of various mill moving parts including bearings. As a rule, central oiling systems are local positioned machinery not being a part of the automated dispatch control system...

In the electric-power systems, which include hydroelectric power plants (HPP), the important objective is the increasing of water resources utilization efficiency. Hydroelectric power plants have a great impact on the distribution of power at the regional level and especially in the wholesale electric...

This paper is devoted to simulation of the stress-strain state of a steel-encased concrete piles. Often, the use of steel-encased concrete piles is the most technologically advantageous, especially when large-sized structures are built in difficult ground conditions. However, traditional concrete-filled...

This article concentrates on the analysis of building heating systems as controlled objects within the dispatching automated power system of a group of buildings. As a result of experiments, main control, perturbation influence, and the controlled variable - heating system return temperature - are defined....

A typical approach to calculation of energy losses in traction circuits of electrified transport is compared to a proposed method of traction network electrical parameters calculation. The method is based on probabilistic experiments which include generation instant equivalent circuits of traction network...

While creating new or upgrading already functioning production, problems of analysis of multiple technical and organizational options and the choice of optimal solutions arise. Currently, equipment is designed based on past experience and intuition, and technology parameters are calculated by taking...

Information about value and distribution law of stresses along tooth root of gears allows one to estimate loading capacity and durability of gear transmissions in real operation conditions. The paper considers new original means for determination of stresses in tooth roots - Integral Strain Gauges. Results...

The paper is devoted to the development of specialized software for simulating the electrodynamic processes in induction motors. This software includes both the graphical interface and the computational modules based on quasi-3D finite element modeling of electrodynamic processes as well as 3D finite...

The problem of determining the roll angle of a fast rotating object has been analyzed in the paper. Possibility of creating a fast rotating single-axis orientation system that was able to determine the roll angle for a long time with minimal errors, based on data from various sources, has been considered....

In the paper, new principles and methods for determining the transfer characteristic parameters for a micromechanical angular velocity sensor, as well as an assessment of the significance and efficiency of these parameters, have been described. The structure and algorithms for obtaining and processing...

The study analyses methods of energy recovery of solid waste. A conclusion is reached that the most effective method for small-scale units is incineration in a pyrolysis furnace. Instrument measurements were used for evaluation of pyrolysis furnace incineration efficiency for cylindrical briquettes of...

The work studies the results of the heat exchange process simulation through the bond of various types, the measurement of heat transfer resistance of the enclosure structure of operated buildings in Moscow, Stary Oskol and Belgorod. In addition, it studies the measurement results of the heat transfer...

The paper presents the results of researching the influence of the mode of creating photocatalytic coatings of glass substrates by the method of reactive magnetron deposition on their bactericidal properties. Tatanium dioxide (TiO2) is in the basis of used film photocatalytic coatings. When depositing...

Analysis of the representative statistical data showed that main causes of frequent expensive major repairs of the section pumps in the pump chamber of the main mine drainage system at the Udachny mine are failures of the impellers and other basic components due to continuous emergency operation of those...

The article presents an analysis of the concept of profiling and its types. It describes the main components and aspects of profiling technology and its applications in different areas of life, particularly in ensuring security in transport, in public life, to prevent offences, commercial and insurance...

The article discusses the analysis of the influence of the connecting hole diameter on the amount of the mixture, flowing from the basic volume to the additional volume at the compression stroke in the prechamber engine. The resulting mathematical model allows one to accurately determine the amount of...

In the article, the method of early diagnostics of nascent defects of mechanical assemblies (friction nodes, bearing pairs, gears) is considered by on-line determination of high-order statistical moments of the vibro-acoustic signal. To determine such statistical moments, a parabolic spline approximation...

Peculiarities of development of gyroscopic-type mixers were considered. The expediency of development of such mixers is presented. The literature review on this subject was performed. Author's kinematic scheme and a variant of the laboratory plant of the mixer (three-dimensional model), describing the...

The influence of nanoadditives of organic and inorganic origin on the rheological properties of heavy fuel oil was considered. Diproxamine, an oil soluble nonionic surfactant, multiwalled carbon nanotubes of the carbon nanomaterial Taunit and dehydrated carbonate sludge were used as additives. The search...