Background. TiO2-SnO2 nanocomposites receive a lot of attention due to their efficient application in heterogeneous photocatalysis. Coupling TiO2 with SnO2 contributes to the suppression of charge carriers’ recombination and enhances photocatalytic performance of the material. Although considerable research on TiO2-SnO2 system has been conducted, there is still a great...
Background. The work is devoted to the study of the optical properties of chalcogenide compounds (GeTe)x(Sb2Te3)1-x, which are promising for use as functional materials in non-volatile memory devices and displays. Information storage is based on the contrast of physical properties between the crystalline and amorphous states of these compounds, which in a metastable crystalline...
Background. Chalcogenide glasses comprise a unique materials platform and are attractive in view of various applications that make use their intriguing characteristic, the ability to form surface-relief patterns. The interaction of these materials with the electron beam is of interest due to diversity of physical phenomena induced in chalcogenide films by laser irradiation...
Background. One of the biggest tech trends in manufacture and equipment engineering today is the desire to automate processes in order to increase their efficiency and minimize the influence of the human factor. A promising direction for the implementation of this concept is computer vision methods based on the automation of image processing and analysis. Machine learning allows...
Background. The content of the considered conceptual model is explained through the concepts of “concept”, “monad”, and concept-monadic complementation that is fundamental for the technological programming environment. The concept-monadic environment is a platform that really implements the understanding of programming as a subject-object productive activity – the complementarity...
Background. Classical steganographic data protection is based on hiding the fact of secret data existence. Until this fact is disclosed, the data remains protected. However, in most of the cases, such protection is insufficient for ensuring data security. Therefore, it is common practice to combine data encryption and steganographic embedding. Recently, this approach has been...
Background. In water-heating boiler houses, where natural gas is burned to produce heat in the form of hot water, it is necessary to reduce its consumption by reducing the temperature of the wasting flue gases from the boilers and, accordingly, increasing their efficiency. But nowadays, a more important problem is the problem of environmental protection, one of the directions of...
Background. Development of the technological measures for creating new antifriction composite materials based on waste powders of steel P7M2F6 with solid lubricant CaF2, intended for operation at temperatures up to 600 °C, sliding speeds up to 1 m/s, loads up to 5.0 MPa in air.Objective. The purpose of the paper is to determine the features of structure formation and their...
Background. A schedule ensuring the exactly minimal total tardiness can be found with the respective integer linear programming problem. An open question is whether the exact schedule computation time changes if the job release dates are input to the model in reverse order.Objective. The goal is to ascertain whether the job order in tight-tardy progressive single machine...
Background. Recently, the problem of recycling and regeneration of concentrated waste technological solutions containing non-ferrous metal ions, in particular copper, has become acute. The particular complexity of processing such type of solutions is caused by the presence of nitrates and chlorides in their composition, causing their chemical aggressiveness. There is a great...
Background. The use of lasers is one of the promising directions in the development of therapy and surgery. The effect of low-intensity laser radiation (LR) in therapeutic doses activates regenerative processes in tissues, which allows stimulating regeneration processes due to the intensification of microcirculation of metabolic processes and also has an effect on neuro-reflex...
Background. Parametric synthesis of zoom-afocal optical systems for zoom-lens. Algorithm for the overall calculation of the four-component zoom-afocal systems, which provides overall limitations, the desired range of variation of the angular magnification and the field of view of the zoom-lens, the permissible vignetting of the beam beams in the entire range of angular...
Background. The article deals with the original variational problem of the brachystochronous motion of a material point on a cycloidal surface between two given points in a vertically homogeneous gravitational field. The novelty and relevance of the work is explained by the choice of the transcendental surface, since earlier the motion of a material point was considered on...
Background. The method of explosive electron-beam evaporation-condensation of materials in vacuum opens up new possibilities for obtaining materials containing components, with a significant difference in the elasticity of the vapor, as well as complex alloyed compounds. This technology is promising for the production of various types of materials of controlled chemical...
Background. The use of centrifugal forces in heat exchangers provides high efficiency of heat and mass transfer processes and allows creating devices that are operable under microgravity conditions. The short contact time of the solution with the heat exchange surface prevents deposits of dissolved substances when concentration of the solution increases. As a result, the...
Background. Alkalis and metal alkoxides are used as catalysts for the amidation of vegetable oils. However, the use of known catalysts does not always allow to soften the conditions of the processes to the required level. The use of potassium tret-butoxide as a catalyst for these reactions can serve as a solution to the problem.Objective. Verification of the use of potassium tert...
Background. Ultrasound occupies an important place among many therapies in physiotherapy. The process of ultrasound treatment in physiotherapy consists of the contact interaction of the ultrasonic emitter with the surface of the skin of the patient's body. The issue of patient safety remains relevant to this procedure. Thus, in everyday clinical practice deviations of the...
Background. Information is one of the key elements for effective supply chain (SC) management. Availability of timely information ensures the continuous movement of commodity flows, minimizes the company's losses associated with the lack of goods or excess stocks, allows you to plan production and financial flows, take into account changes in consumer interests. The systems of...
Background. At present, the issue of increasing energy efficiency of buildings and simultaneously ensuring the proper quality of microclimate subject to environmental parameter changes is becoming topical.Objective. The purpose of the paper is energy efficiency analysis as an energy system in the application of dynamic energy modeling, taking into account the relationship of...
Background. The brain perfusion ROI detection being a preliminary step, designed to exclude non-brain tissues from analyzed DSC perfusion MR images. Its accuracy is considered as the key factor for delivering correct results of perfusion data analysis. Despite the large variety of algorithms developed on brain tissues segmentation, there is no one that works reliably and robustly...
Background. The main element of optical information processing systems is a coherent optical spectrum analyzer (COSA). In the textile industry in the manufacture and use of thin transparent fabrics (gauze, bandages, etc.) there is a problem of controlling the shape and geometric dimensions of transparent cells. For this purpose, microscopes are used with the help of which the...
Background. Low-cost control by energy-carrying coherent vortex structures (CVS), determining transfer processes of mass, momentum and energy in vortex mixing chambers (VC) to increase working processes efficiency in vortex technological and power apparatuses.Objective. The purpose of the paper is to investigate the response of the CVS at the outlet of the VC on directional...
Background. The problem of minimization of total weighted tardiness can be solved either exactly by the corresponding models or heuristically. As of October 2019, nearly the best heuristic is one based on using remaining available and processing periods. The heuristic is extremely rapid compared to the exact solution models, but its accuracy can be both 100 % and intolerably low...
Background. In deploying a wind farm, it is important to hold a balance of energy generated by wind turbines and costs spent on buying and installing them. However, ranking the energy and costs is commonly uncertain. Besides, the existing methods of optimal wind farm deployment are pretty slow, whereas even optimal numbers of wind turbines of certain types along with their costs...
Background. The features of scattering anisotropy factor determination in the research of thick biological tissue samples.Objective. The purpose of the paper is development and testing of new method of tissue scattering anisotropy factor determination. The method is based on the analysis of illuminance of different zones of photometric images, received during the photometry by...