http://repository.enu.kz/handle/enu/5263 2026-04-04T03:50:29Z http://repository.enu.kz/handle/enu/5266 Landscape forming factors of the Karkaraly low mountains Keukenov, Ye.; Dzhanaleeva, K.; Baryshnikov, G.; Orazymbetova, K. The territory of geosystems of the Karkaraly low mountains is mainly forest landscapes and dark-chestnut soil cover. The paper reflects the state of the soil and vegetation cover of the forest landscapes of the Karkaraly low mountains in the Karaganda region. The paper provides the results of chemical soil tests, describes the vegetation cover samples using geoinformation technologies based on the standard quantitative index NDVI (Normalized Difference Vegetation Index), confirmed in field studies in the summer of 2020. The work performed aims at a comprehensive assessment of the physical, chemical, and biological characteristics of the components of geosystems. In course of the field study, a brief description of phytodiversity was compiled, indicating the geomorphological attributes of key areas. To study the vegetation, sample plots of the underlying soil and vegetation cover were set. Overview and thematic maps of the object under study were created. At the final stage of the study, the interpretation of the results is presented with the identification of cause-and-effect relationships of the state and fluctuations of geoecosystems. Data sources include satellite images of Landsat-8 (US Geological Survey) and field studies along the routes and four key areas. The results of the work allow defining the object under study, determining the distinctive properties in key areas, as well as possible reasons for the difference in the studied territory of geosystems. 2023-01-01T00:00:00Z http://repository.enu.kz/handle/enu/5265 Обзор: Извлечение металлов платиновой группы из каталитических конвертеров Куликов, М.; Копишев, Э. Металлы платиновой группы (PGM) широко используются в каталитической промышленности благодаря своим выдающимся физикохимическим свойствам (высокотемпературная стабильность, высокая каталитическая активность). Они используются в медицине, электронике, нефтепереработке, производстве аммиака, топливных элементов, автомобилестроении и т.д. Каталитические отходы являются важным вторичным источником металлов, поскольку переработка отходов является более экономичным и экологичным способом получения металлов по сравнению с добычей из руд. Отработанный автомобильный катализатор является богатым источником металлов платиновой группы [PGM: платина (Pt), палладий (Pd) и родий (Rh)], которые содержат более высокие концентрации PGM, чем в природных рудах. В данной статье представлен критический обзор состояния методов извлечения металлов платиновой группы из утилизированных катализаторов, их преимуществ и недостатков. В результате были проанализированы все методы и выделены наиболее перспективные (наиболее экологичные и экономичные). 2023-01-01T00:00:00Z http://repository.enu.kz/handle/enu/5264 Synthesis of octochlorosubstituted cobalt(II) and copper(II) complexes with phthalocyanine Nurpeisova, D.Т.; Тashenov, А.K.; Jakupova, Zh.Ye.; Dosmagambetova, S.S.; Тosmaganbetova, G.S.; Omarova, L.S. A modified method for the synthesis of metallooctachlorophthalocyanines and methods for their purification based on their sequential treatment with hydrochloric acid (10%) sodium hydroxide (2M), then again with hydrochloric acid (10%), pyridine (O.S.C.) in 1,2,4- trichlorobenzene as a solvent is presented. As a result, the degree of purification of copper ion complexes was achieved, 99% versus the best result using methods known in the literature 93%, for cobalt the degree of purity was 98% versus 88%. The yield of the products is also higher than in the known methods and amounted to 78, cobalt -43 for copper compounds. Physico-chemical methods have established that after the final stage of purification-pyridine treatment, impurities are removed, including cyanuric acid, the decomposition product of urea, the results of elemental analysis for carbon, hydrogen, nitrogen conducted on the ThermovomTypFlashEA 1112 analyzer complexes of cobalt (II), copper (II) with phthalocyanine, the assignment of bands of IR spectra recorded in KBr tablets on the Nicolet IR-200 FT - IR spectrophotometer, UV- the spectra of sulfuric acid solutions of metallooctachlorophthalocyanines taken on a Varian, UV - Vis/NIR spectrometer. 2023-01-01T00:00:00Z