The results of spectral observations of the Algol-type binary star U Sagittae (U Sge) are presented. The behavior of profiles: hydrogen lines of the Balmer series (H-H) and HeI 5876A0, as well as lines of resonance doublets – DNaI and KCaII, during the orbital peri-od of the eclipsing binary system U Sge, is described. Radial velocities of the hydrogen lines (H-H) and HeI 5876A0, were measured. Based on these measurements radial velocity curve of the main component of the U Sge system were constructed. Value of phases about 0.8 in the blue and about 0.3 the red wing of the absorption line Н an additional absorption detail appears. Our preliminarily assumption is that this observa-tion may be due to the fact that the H alpha line is also visible on the secondary com-ponent at the beginning and end of the eclipse, and it is not excluded that this is related to the so-called of effect Mclaughlin of Rossiter or this absorption line are linked to supposed 3rd component.

It was investigated the temperature dependence of the specific resistivity and thermoe-lectric power of (AgSbTe2)0.8(PbTe)0.2 in the 80-550 K temperature range and the spec-troscopic ellipsometric optical measurements at 300K. The band gap of (AgS-bTe2)0.8(PbTe)0.2 was estimated according to experimental data on electrical conductivity (Еg=0.13eV), thermal power (Еg=0.18eV) and using Vegard's rule (Eg=0.214 eV). The val-ue Еg=0.2eV for band gap of (AgSbTe2)0.8(PbTe)0.2) was obtained according to optical measurements.

The results of spectral observations of the symbiotic star AG Pegasi (AG Peg) are pre-sented. The spectra of the star AG Peg were obtained with a spectral resolution of R = 28000 during the period of 2016-2019, in the wavelength range λ = 3900–8000 Å. Based on the AAVSO (American Association of Variable Star Observers), data for the period 1954-2022, a periodicity in the star's brightness changes was identified, with a period of about 815 days. The behavior of selected spectral lines in different phases of the orbit of the AG Peg binary system is described as follows. Profiles of the considered emission lines show strong variability, with a complex structure - single-peaked, double-peaked, and intermediate between them. In general, their variability does not show dependence on the orbital period of the AG Peg binary system. The change in the radial velocities of the absorption lines and the temperature of the hot component corre-sponds to the light curve of the star AG Pegasus, constructed for a period of P = 815 days, which we found from photometric data.

Fe3O4 nanoparticles' accumulation in aquatic organisms, especially fish, and their induc-tion of various pathological changes in the host organism have raised significant con-cerns. In our study on common carp, subjected to two different doses of Fe3O4 nanopar-ticles (10 and 100 mg per 10 g of food) for a 7-day period, notable alterations were observed in the intestine and liver. At a lower dose (10 mg), distinct changes like villi disintegration in the small intestine and cytoplasmic structure pathology in enterocytes were evident. Liver examination revealed alterations in erythrocytes, hepatocytes, cana-liculi, and bile ducts. With a higher dose (100 mg), destructive changes occurred in all layers of the small intestine and the liver. Electron microscopy confirmed the sequential entry and bioaccumulation of Fe3O4 nanoparticles, starting from microvilli and travers-ing various cellular organelles. The observed nanoparticle size in fish intestine and liver structural elements was consistently up to 20 nm. These findings underscore the poten-tial risks associated with Fe3O4 nanoparticles, emphasizing the need for further investi-gation into their environmental impact and implications for aquatic ecosystems.

In this paper, the analytically bound state solution of the Dirac equation is obtained for the linear combination of the Manning-Rosen and Yukawa potentials by using Nikiforov-Uvarov method. To overcome the difficulties arising in the case for arbitrary k in the centrifugal part of the Manning-Rosen potential plus the Yukawa potential for bound states, we applied the developed approximation. Analytical expressions for the energy eigenvalue and the corresponding spinor wave functions for an arbitrary value k spin-orbit, radial n and l orbital quantum numbers are obtained. The relativistic energy eigenvalues and corresponding spinor wave functions have been obtained for cases exact spin and pseudospin symmetries by using the Nikiforov-Uvarov method. Furthermore, the corresponding normalized eigenfunctions have been represented as a recursion relation in terms of the Jacobi polynomials for arbitrary k states. A closed form of the normalization constant of the wave functions is also found. It is shown that the energy eigenvalues and eigenfunctions are very sensitive to k spin-orbital quantum number.

In the work, two multivariate analysis methods Neural Network (NN) and Boosted Decision Tree (BDT) were used to separate the ZH(bb ̅) signal from the background and the results obtained from them were compared. The list of input variables for BDT and NN is similar to those used in the analysis in the ATLAS experiment. Up to 0.8 million signals and the same number of background events were used for training and testing. The settings used in the ATLAS analysis, which has the best performance, were chosen to tune the BDT hyperparameters. Various number of events (0.1M, 0.2M and 0.8M) are trained and different settings for NN are obtained, providing performance that exceeds that of BDT. It turns out that for any number of training events, it is possible to find corresponding NN settings with better performance than BDT. The problem with NN training is that it is computationally intensive compared to BDT.

Soft magnetic amorphous materials are considered a new type of magnets. Although amorphous materials have a wide scope in modern times, new areas of application can be obtained by improving their properties. In this study, as a result of heat treatment of the composition Fe59Ni19Si9B13 and Fe39Ni39Si9B13, materials with properties suitable for operation were obtained.

The influence of the silicon nanoparticles on the structure and optic properties of the polystyrene-based nanocomposites was investigated. PS+Si nanocomposites were prepared by combinations of the solution blending and hot pressing methods. The EDS spectrum of Silicon characterizes the high purity of nanoparticles. The XRD study of the nanocomposite samples shows that silicon nanoparticles play not only the role of filler but also have a structure-formatted function in the nanocomposite. PL properties of the polymer nanocomposite also prove that silicon nanoparticles, play the role of the center of the structure to format a more ordered arrangement in the polymer matrix. It was clear that the PL emission of the nanocomposite enhanced with the introduction of the silicon nanoparticles at the 450-550 nm region. This increase results in the expansion of the emission region of the pure polystyrene by the addition of a few amounts of silicon nanoparticles. This PS+Si nanocomposite could be an effective material for biomedical applications as a fluorescent marker for drug delivery systems.

The study of the cross sections of the knocking out nucleons provides important infor-mation about the asymptotic behaviour of the scattering amplitude. During the interac-tion of the incident particle with nucleus, its function is distorted. In this case, we are talking about those components of the wave function for which the probability of inter-action with the target is small, i.e. during the collision, only a small part of the target is excited (an elastic collision with only one of its constituent particles). To do this, it is necessary to use the "point" component of the wave function of the incident particle.

Zinc cadmium oxide (ZnCdO) synthesis of zinc-oxide-based nanomaterials with specific properties is a great challenge due to its excellent industrial applications. We report the production of zinc cadmium oxide thin films as a first step for developing a n-ZnCdO/p-Si heterojunction.