Категория: # 1, 2025

«Limita» concept evolution in song discourse

Posted on by

DOI 10.51955/2312-1327_2025_1_

Vera P. Novikova

Iuliia P. Tkachuk

Abstract. The article analyses the modifications of the concept «limita» in the context of song discourse. To solve this problem, the method of analysis of dictionary definitions and inductive frame allocation, discursive and stylistic analysis, conceptual analysis, description of cognitive metaphor, and contextual interpretation were used. The study reveals the expansion of the concept through several key frames, including social, economic, emotional, historical and «migration» ones. Considering the given concept from different points of view, the frame analysis reveals its social, economic, emotional, historical and migration aspects. The analysis of the concept «limita» serves as an example of how song discourse can reflect and shape social stereotypes. The study shows that song discourse not only entertains, but also performs an important social function, contributing to the formation of public opinion and identity.

Keywords: concept, anti-concept, frame, song discourse, linguoculturology, cognitive linguistics, functions of discourse.

Download article in PDF 401.6 kB

Transistor switches driving in ADS-B / mode 4 amplifiers

Posted on by

DOI 10.51955/2312-1327_2025_1_

Fedor M. Stepanov

Abstract. Design process of highly efficient means of communication, surveillance and navigation using switch-mode amplifiers requires a revision of traditional approaches to the circuitry of radio transmitting devices. The parameters of the physical layer of ADS-B systems using VHF datalink mode 4 (VDL-4) theoretically allow the use of switch-mode amplifiers as part of their transmitters. Such an improvement plays a particularly important role in the context of integrating unmanned aerial vehicles (UAV) with limited energy reserves on board into the general airspace.

One of the important tasks in the design of such radio technical support for flights operating in the VHF range (primarily onboard, but also ground-based) is to determine approaches to control transistor switches of a power amplifier based on the criteria of efficiency, stability and the ability to provide different operation modes of the switch-mode amplifier. Requirements for the control device have been developed taking into account the standard for the physical layer of VHF datalink mode 4. A conclusion is given on the optimal solutions suitable for building a VDL-4 transmitter with a switch-mode power amplifier, opening up prospects for increasing the efficiency of more than 90%, compared to today’s not exceeding 46%.

Keywords: VDL-4, VHF mode 4, radio transmitter, switch-mode power amplifier, modes (D, DE, E), integrated circuit.

Download article in PDF 794.6 kB