http://repository.enu.kz/handle/enu/5255 Sat, 04 Apr 2026 16:11:15 GMT 2026-04-04T16:11:15Z http://repository.enu.kz/handle/enu/5258 Analysis and assessment of surface water quality in the Ilek river basin Safarov, R.Z.; Mendybayeva, G.E.; Mendybaev, E.H. The article is devoted to the study of hydrochemical indicators of surface waters of the Ilek River and large tributaries. The study was conducted based on the results of expeditionary observations in 2020-2021. Surface water samples were taken at key sites for chemical analysis of constituents. The scientific article describes natural and technogenic factors influencing the geosystems of the Ilek river basin. The paper reveals the dependence of surface water pollution on the impact of external technogenic factors. The study showed a direct dependence of surface water on the industry. In the upper part of the Ilek River basin, high concentrations of copper and zinc are observed in surface waters. In the middle reaches of the river Ilek exceeding the MPC by a factor of ten for chromium, iron, and boron is obviously associated with intense pollution of the production of the Aktuinsk chromium plant and the Aktobe ferroalloy plant. The work also describes the pollution of the tributaries of the Ilek River of the first and second order, associated with the mining industry in the regions. Sat, 01 Jan 2022 00:00:00 GMT http://repository.enu.kz/handle/enu/5258 2022-01-01T00:00:00Z http://repository.enu.kz/handle/enu/5257 Анодный материал SiOx для литий-ионных аккумуляторов Абдрахманова, А.Б.; Омарова, Н.М.; Балташ, Е.С.; Маушанова, Д.А. Из-за интенсивного выпуска электронных устройств и аппаратов спрос на литий-ионные аккумуляторы растет. К основным требованиям в этих запросах можно отнести большую автономную работу,более безопасную и меньшую по объему, более удобную в использовании. Ученые с целью увеличения емкости аккумуляторов используют метод замещения графита на отрицательном электроде ЛИБ кремнием, теоретическая емкость которого в 10 раз выше. Однако к основным препятствиям при использовании кремния в качестве отрицательного электрода можно отнести: увеличение объема анода в процессе литизации и процессы, протекающие на межфазной границе. Поэтому разработка оксида кремния SiOx на основе кремния в качестве отрицательного электрода позволит усовершенствовать электрохимические свойства кремния. Sat, 01 Jan 2022 00:00:00 GMT http://repository.enu.kz/handle/enu/5257 2022-01-01T00:00:00Z http://repository.enu.kz/handle/enu/5256 Prospective sources of natural sesquiterpenoids Yelshibayeva, A.M.; Jalmakhanbetova, R.I. Sesquiterpene lactones are the main component of many genera of the Asteraceae (Compositae) family. They include active compounds that are used in traditional medicine to treat a variety of ailments. Several sesquiterpene lactones, such as mipsagargin and artemisinin, are already available for sale and used to fight tumor growth, and malaria, respectively. In this article, we present data on prospective sources of new sesquiterpene lactones from species of the Asteraceae family over the past 10 years. The review contains information on the geographical distribution of genera, instrumental methods of analysis, as well as an explanation of the chemical structure and biological activity of sesquiterpene lactones isolated for the first time. Sat, 01 Jan 2022 00:00:00 GMT http://repository.enu.kz/handle/enu/5256 2022-01-01T00:00:00Z