In this paper, the possibility of applying the electrospark alloying (ESA) method to obtain boron-containing coatings characterised by increased hardness and wear resistance is considered. A new method for producing such coatings is proposed. The method consists in applying grease containing aluminium powder and amorphous boron to the surface to be treated and subsequently processing the obtained surface using the ESA method by a graphite electrode. The microstructural analysis of the Al-C-B coatings on steel C40 showed that the surface layer consists of several zones, the number and parameters of which are determined by the energy conditions of the ESA process. Durametric studies showed that with an increase in the discharge energy influence, the microhardness values of both the upper strengthened layer and the diffusion zone increased to Wp = 0.13 J, Hµ = 6487 MPa, and Wp = 4.9 J, Hµ = 12350 MPa, respectively. The results of X-ray diffraction analysis indicate that at the discharge energies of 0.13 and 0.55 J, the phase composition of the coating is represented by solid solutions of body-centred cubic lattice (BCC) and face-centred cubic lattice (FCC). The coatings obtained at Wp = 4.9 J were characterised by the presence of intermetallics Fe4Al13 and borocementite Fe3 (CB) in addition to the solid solutions. The X-ray spectral analysis of the obtained coatings indicated that during the electrospark alloying process, the surface layers were saturated with aluminium, boron, and carbon. With increasing discharge energy, the diffusion zone increases; during the ESA process with the use of the discharge energy of 0.13 J for steel C40, the diffusion zone is 10–15 μm. When replacing a substrate made of steel C40 with the same one material but of steel C22, an increase in the thickness of the surface layer accompanied by a slight decrease in microhardness is observed as a result of processing with the use of the ESA method. There were simulated phase portraits of the Al-C-B coatings. It is shown that near the stationary points in the phase portraits, one can see either a slowing down of the evolution or a spiral twisting of the diffusion-process particle.
We analyzed the main cloud services in the article. We also described the main contribution of mobile cloud technology to education. The article presents the author’s development from the field of mobile cloud education in higher mathematics. The design architecture of this application is described in detail: QR generator and scanner, authorization, sending tasks. Block diagrams and images are presented that clearly demonstrate the operation of the application. We showed an example of solving the integral from the section of integral calculus for higher mathematics and showed how to download the answer in the form of a QR code and find out whether it is correct or incorrect (this can be seen by the color on the smart phone screen). It is shown how this technology helps the teacher save time for checking assignments completed by students. This confirms its effectiveness. Such an application provides students and teachers with the ability to store and process data on a cloud computing platform.
Introduction. Thanks to a rapid advancement of technology, the clothing industry is rapidly developing into a high-tech and capital-intensive production. This contributes to a high quality of design, pattern cutting, and manufacture. The industry is one of the fastest growing in the manufacture sector. Therefore, it is extremely important to enable industry professionals and researchers to keep pace with changes to achieve the desired competitiveness of products. Mobile applications for the garment industry (Stylebook, Cloth, Polyvore, etc.) have been analyzed. These applications contain galleries of clothing models, but only for specific styles of fashion and unrecognizable sizes. Therefore, they can be used as a guide for creating clothes of similar fashion styles but without the necessary level of accuracy. Problem Statement. Mobile applications that are now available for use in the clothing industry are oriented towards the sale of finished products. Since the design and manufacturing stages are provided with software products only at the "home" level, there is a need for the development of mobile applications for clothing industry experts. To develop such an application, it is advisable to choose a design methodology that is both simple, accessible, and known to a wide range of users. Purpose. To develop a mobile application for calculating the parameters of the main blocks of clothing. Materials and Methods. To create our application, an advanced and convenient programming language Kotlin has been used. Results. Based on the comparative analysis of the means of calculating the basic clothing designs, the expediency of using mobile applications in the garment industry has been proved. The existing mobile applications that are used or can be used in the design and manufacture of clothing have been classified. The quantitative classification analysis has confirmed the original hypothesis on the lack of mobile applications used while making a typical basic design. To calculate the parameters of the basic design of top wear, a mobile application has been developed. It provides support for the automated process of creating clothes designs, both in individual or small-scale production, as well as in the learning process. Conclusions. The developed package enables making specific drawings for top wear of any size. The user gets the coordinates of basic design for making patterns for mass production or for individual pattern cutting.
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