In this scientific article, a comparative analysis of the concepts of ethnicity and nation is carried out. First, the historical, cultural and political aspects of the concepts of ethnicity and nation are deeply studied in the article. the differences and similarities between these are analyzed, the social importance, role in society, and specific characteristics of each are highlighted.

The article analyzes the socio-psychological rehabilitation of people with disabilities and children with disabilities, the foundations of their protection in international law. The attention of the international legal community to people with disabilities and the work carried out in the legal sphere of people with disabilities are studied in detail. The full protection of the rights of people with disabilities in the international framework and the creation of conditions for them are considered.

This article discusses the types and classification of unmanned aerial vehicles (UAVs). It analyzes them based on their usage purpose, technical characteristics, and control systems, categorizing them accordingly. The article highlights the development of unmanned technologies and their significance in various fields.

Authentication methods for important parts of the face are one of the modern biometric systems. These tools are based on the identification of the person through the unique geometric and visual analysis of the human face. The face is realized by deep algorithm technologies with the help of different forms of artificial intelligence, neural tools based on learning ability. These authentication methods are mainly used in smartphones, computers, and government services. In this topic, the main principles of facial recognition technology, the working process, technological and material aspects are covered. Their problems, such as faking facial images or cheating the system, are discussed. The abstract discusses facial image processing, data protection, and their software solutions. By implementing and developing these facial recognition technologies, we achieve results such as convenience and simplicity, prevention of illegal access, compliance with international standards, and reduction of technical failures.

This article is devoted to quantum chemical research, the influence of the number of methylene groups on the reactivity of propylenediamine. An analysis of the data on the electronic structure and energy characteristics makes it possible to determine the role of methylene groups in the reactivity of the reagents and the productivity of the synthesis.