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Annotation: Modern healthcare facilities face the problem of prompt maintenance of complex equipment, such as ultrasound, ventilators and CT machines. In conditions of limited access to qualified engineers, remote diagnostics via video communication is becoming a promising solution. This article examines the effectiveness of remote troubleshooting using video chats, analyzes factors affecting the accuracy of diagnostics, and proposes a standardized interaction protocol. The experiments included an assessment of various diagnostic scenarios, an analysis of communication quality requirements and the identification of types of breakdowns that can be eliminated without the physical presence of a specialist. The results showed that about 65% of faults can be correctly diagnosed remotely, provided that the conditions of a stable Internet connection and clear interaction with a technician on site are met. The developed technique allows to reduce equipment downtime and reduce service costs.

Annotation: Hair coloring is a complex biochemical process in which the acid-base balance (pH) plays a key role. The degree of cuticle opening, the rate of dye penetration, the stability of the pigment and the general condition of the hair after the procedure depend on the pH level. This article examines in detail how different pH levels affect the hair structure, the mechanism of action of different types of dyes and the quality of the final result. Research shows that highly alkaline formulations (pH 9–11) provide deep pigment penetration, but can damage the keratin structure. At the same time, slightly acidic dyes (pH 3–6) act more gently, but provide a less lasting effect. Optimum pH values vary depending on the type of dye and the desired result. Particular attention is paid to modern developments in the field of gentle coloring compositions that minimize damage without losing effectiveness. Methods of hair restoration after coloring are also considered, including the use of acid conditioners and protective agents.

Annotation: This study is a comprehensive analysis of the influence of fundamental laws of visual perception on the formation of compositional solutions in modern photography. The work examines in detail the neurophysiological and psychological aspects of image perception, systematizes the main compositional principles and their practical application in various genres of photography. Particular attention is paid to experimental data confirming the effectiveness of various compositional approaches, as well as to the analysis of cultural and historical aspects of the perception of visual information. The article contains detailed illustrations, graphs and diagrams that clearly demonstrate the dependence of viewer perception on the compositional techniques used.

Annotation: The modern manicure industry is undergoing a transformation associated with the transition to eco-friendly technologies and health-friendly materials. Traditional varnishes and coatings contain toxic components that negatively affect both clients and the environment. The concept of "green manicure" involves the use of biodegradable compounds, energy-efficient equipment and recyclable packaging. These innovations can significantly reduce the ecological footprint of the industry. This article examines in detail modern eco-friendly alternatives to traditional manicure products. Particular attention is paid to their impact on the health of clients and masters, as well as the prospects for the development of sustainable nail services. The study is based on the latest scientific data and market trends in the beauty industry. The presented material will be useful both for industry professionals and conscious consumers. The article includes six main sections, each of which reveals in detail a certain aspect of eco-friendly manicure. Additionally, graphic data is provided that clearly demonstrates the advantages of new technologies.