Current Issue

DOI:10.55841/1728-791X-2024.1.42-4

Pages 4-8

The introduction of the Lycium barbarum (LbL) plant variety to the Republic of Armenia and Artsakh, considering soil and climate conditions along with phytotechnology of cultivation, resulted in the preservation of its growth and development stages without significant alterations. The plant successfully formed fruits and maintained biochemical content typical of its natural habitat. This suggests that the flora could benefit from the addition of this new, promising plant species, which possesses medicinal and preventive properties, nutritional value for both humans and animals, and potential for enhancing ecological environments through various means such as greening of bare slopes, ornamental gardening, and roadside plantings. Furthermore, LbL exhibits frost resistance, drought resistance, and low agrochemical requirements for soil. The discovery of germanium in the biomass of LbL fruits and leaves, and its correlation with environmental and cultivation conditions, implies that the concentration of this anti-tumor element in the plant material can be regulated.

DOI:10.55841/1728-791X-2024.1.42-9

Pages 9-15

The rapid pace of development in science and technology in recent decades has opened new prospects for exploration in various fields, including space. In this context, the creation and development of intelligent manufacturing solutions and multifunctional raw materials are of utmost importance. Selection of raw materials for the thermal management applications in space is crucial, considering both physical aspects such as density, thermal expansion, radiation resistance, and mechanical aspects also. In the frame of this work, we present additive manufacturing or three-dimensional (3D) printing technology as an advanced method for manufacturing parts with complex geometric structures. In addition, we will consider the importance of silicon carbide as a valuable raw material, especially in its application in thermal management systems used in space.

DOI:10.55841/1728-791X-2024.1.42-16

Pages 16-21

In the framework of the work the description of sphere wave filed in the far observation region is discussed. The consideration is based on the decomposition of the wave field over the longitudinal and transverse spatial parameters of the problem in the direction of observation. It is shown that the approximation of a sphere wave by the flat field is correct only if the consideration is conducted in the limit of solid angle. The magnitude of the solid angle, which includes the area of flatness of the spherical wave, is determined using the so-called wave parameters corresponding to the observation area and the illuminated point. The wave field created by a small flat area is defined as a limit case of a superposition field generated by a system of point sources. It is shown that in an observation point the wave field of a small flat area can be characterized by the angle between the area normal and the vector indicting from the given area the observation point. The problem of description of a wave filed in the framework of a small flat aria is also discussed. A new method for deriving of the well-known obliquity factor of the Kirchhoff diffraction theory is suggested.