Actual problems of Mathematics, Physics and Mecanics
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Actual problems of Natural Sciences
SYNTHESIS AND SINGLE-CRYSTAL X-RAY DIFFRACTION STUDY OF A COPPER(II) COMPLEX WITH 2-AMINO-5-ETHYLTHIO-1,3,4-THIADIAZOLE AND 1,10-PHENANTHROLINE
This paper presents the results on the synthesis and study of the structure of a new mononuclear complex of copper nitrate with 2-amino-5-ethylthio-1,3,4-thiadiazole and 1,10-phenanthroline. Using the method X-ray diffraction analysis, the structure of the complex was studied. It was shown that...
3 August 2026, 22:06
SYNTHESIS AND STRUCTURE OF MIXED LIGAND COMPLEXES BASED ON AMIDE DERIVATIVES AND METAHYDROXOBENZOATE
In this work, the synthesis, structure, quantum chemical analysis, and spectroscopic properties of complex compounds [Co(C7H5O3)2(L1,2,3)2] (where L1-nicotinamide, L2-thiocarbamide, L3-acetamide) obtained on the basis of the divalent cobalt (Co(II)) ion with amide derivatives were studied....
3 July 2026, 22:12
METHODS FOR PROTEIN EXTRACTION FROM ARTEMIA BIOMASS AND THEIR PRACTICAL SIGNIFICANCE: A LITERATURE-BASED REVIEW
The brine shrimp Artemia (Anostraca, Branchiopoda) is the primary live and dry feed source used in more than 85% of world aquaculture, and its nutritional value is determined chiefly by its high protein content (30-80% of dry matter) and balanced amino acid profile. Based on more than thirty...
3 July 2026, 22:11
SYNTHESIS, STRUCTURAL CHARACTERIZATION, AND ANALYSIS OF THE Co(II) COMPLEX WITH 2-HYDROXYBENZAMIDE AND MONOETHANOLAMINE
This article presents the synthesis and physicochemical characterization of a mixed-ligand Co(II) complex with salicylamide and monoethanolamine (MEA) ligands. The complex was synthesized in an alcohol–water medium using a GT SONIC-D3 professional ultrasonic cleaner operating at a frequency of 40...
3 June 2026, 22:08
ECOLOGICAL FACTORS AND THEIR INFLUENCE ON THE HEALTH OF THE POPULATION OF THE REPUBLIC OF KARAKALPAKSTAN
This article analyzes the current medical and geographical situation of public health in the Republic of Karakalpakstan. The study identifies the multifactorial impact of natural and anthropogenic factors on population health and reveals the major contemporary factors influencing disease patterns...
3 May 2026, 22:16
ANALYSIS OF THE VEGETATION STATUS OF AGRICULTURAL CROPS USING THE NDVI INDEX (as an example of Khorezm region)
This article analyzes the spatial-temporal distribution of vegetation cover in Khorezm region during the 2025 growing season using 10-meter spatial resolution Sentinel-2A/B multispectral data and the Normalized Difference Vegetation Index (NDVI). By leveraging Google Earth Engine and QGIS...
3 April 2026, 22:16
CREATION OF AN INTERACTIVE DIGITAL MAP OF OIKONYMS OF THE KHOREZM REGION
This article analyzes the natural and geographical features of toponyms, in particular oikonyms, based on the geographical location of the Khorezm region, and pays special attention to the aspects of developing their interactive digital map....
3 April 2026, 22:15
MATHEMATICAL PROCESSING OF CALIBRATION CURVE DATA FOR THE COMPLEX COMPOUND FORMED BETWEEN YTTRIUM(III) AND THE REAGENT 2,4-DINITROSO-1-HYDROXY-5-AMINONAPHTHALENE6,8-DISULFONIC ACID, EMPLOYING THE METHOD OF LEAST SQUARES REGRESSION ANALYSIS
Elements of the yttrium group find application in the production of luminescent materials; as alloying additives for steel and cast iron to enhance thermal stability; and in the synthesis of refractory compounds, phosphors, and laser-active materials. Chemical and physicochemical methodologies for...
3 April 2026, 22:14
EFFECT OF INTERGRANULAR BARRIERS ON CHARGE CARRIER MOBILITY IN Mg3Sb2 MATERIAL
This study analyzes the effect of grain-boundary potential barriers on charge carrier mobility in Mg3Sb2-based thermoelectric materials. These barriers reduce mobility but may enhance the Seebeck coefficient via energy filtering. Their effects can be controlled through grain size engineering,...
3 March 2026, 22:00
THERMAL ANALYSIS OF Ni (II) OXALATE-ATSETATE COMPLEX COMPOUNDS
In this work, methods for the synthesis of complex compounds of Ni (II) oxalate with Ca, Cu (II), Co acetates were studied and reactions were carried out. In order to study the composition of the obtained complex compounds, elemental analysis was carried out and the theoretical results were...
3 March 2026, 22:00