World Science

DETERMINATION OF SURFACE ENERGY AT THE INTERFACE BETWEEN POLYMER AND AGGRESSIVE AREA

Porchkhidze A. D. — 2025-05-17

There are discussed the methodology and results of the study of surface energy at the interface between a polymer and an aggressive area.
There are presented the methods and results of x-ray diffraction studies of intermediate grain sires and apps on polymer surface.

THE IMPACT OF INTERIOR LIGHTING ON HEALTH AND VISUAL COMFORT

Radi Ivanov Zahariev — 2025-06-16

Light is being increasingly utilized as a therapeutic intervention, with numerous studies documenting specific cases of its application. Despite its potential benefits, it is crucial to acknowledge the risks associated with adverse side effects. Interior lighting not only defines the aesthetic perception of a space but also plays a fundamental role in shaping human physiological and psychological well-being.
Scientific research has demonstrated that light stimulation can contribute to the improvement of various physiological and psychological conditions, including depressive disorders and sleep disturbances such as insomnia. Conversely, inadequate lighting may lead to headaches, visual fatigue, general exhaustion, and even disruptions in vitamin D synthesis.
This study examines the impact of lighting on human health and explores strategies for optimizing lighting design to enhance visual comfort and boost productivity. The color temperature of light is a critical factor in this context: warm-toned lighting fosters a sense of comfort and relaxation, whereas cooler light enhances concentration and cognitive performance.
To minimize the adverse effects of lighting, it is advisable to use luminaires with adjustable brightness and color temperature, as well as to maximize the integration of natural light into interior spaces. Additionally, reducing glare, ensuring the appropriate placement of light sources, and minimizing flicker in fluorescent lighting are essential measures for improving visual comfort.
Interior lighting should not be regarded solely as an aesthetic element but rather as a crucial determinant of human health and efficiency. An optimized lighting design can significantly enhance quality of life and prevent a range of health issues associated with poor lighting conditions.

MODERN SUBSTITUTES FOR NATURAL CASTOR OIL AS A DIELECTRIC FLUID

Mirjafarova Mehriban Masud — 2025-06-30

Synthetic esters have become increasingly popular over the past decades, which is reflected in the steady growth in the number of installations filled with these liquids. Interest in them is due to both fundamental research aimed at studying breakdown mechanisms and applied aspects of their operation. However, the use of synthetic esters in high-voltage equipment is associated with a number of technical challenges, which requires a deeper understanding of their behavior under various operating conditions. The purpose of this review is to summarize the latest achievements in the study of synthetic esters as dielectrics as a replacement for castor oil, which are most significant for further development and optimization of dielectrics. In particular, the following are considered: electrophysical characteristics of all oils, as well as synthetic esters, their behavior

BASIC REQUIREMENTS FOR THE INSTALLATION OF GRAVEL AND MASTIC EXPANSION JOINTS ON BRIDGE STRUCTURES

Vladyslav Vynogradov — 2025-06-30

The article deals with the technological process of arranging crushed stone and mastic expansion joints on bridges, which are important elements for ensuring stable and safe operation of bridge structures. The main attention is paid to the peculiarities of using crushed stone and mastic materials that provide high elasticity, strength and waterproofing, which allows compensating for deformations caused by mechanical loads and temperature fluctuations.

The article describes the stages of such joints, starting from the preparation of the base to the laying of materials, and also notes the importance of choosing the right components for the production of crushed stone and mastic mixtures. The basic requirements for materials, such as crushed stone, mastics and special additives, which ensure long-term operation of the joints even in difficult climatic conditions, are considered.

The article pays special attention to the technology of laying crushed stone mastic joints, which includes thorough cleaning of the joint, uniform distribution of materials, and control over their quality during installation. Technological procedures are described, such as the use of primers to improve adhesion, reinforcement of joints to increase their mechanical properties, as well as checking the tightness and strength after the work is completed.

In general, the article contributes to a deeper understanding of the technology of arranging crushed stone-mastic expansion joints, which is an important tool for ensuring the safety and durability of bridge structures.