Химические науки список научных статей

Marble plaster, also known as “marble stucco” or “polished plaster”, is a decorative finishing material used in both interior and exterior applications. Made from a blend of marble dust, lime, and other aggregates, marble plaster is prized for its aesthetic appeal, durability, and versatility. This ...

Emerging contaminants (ECs) are a class of pollutants that have recently attracted significant attention due to their potential environmental and health risks. These contaminants include pharmaceuticals, personal care products, endocrine-disrupting chemicals, and industrial chemicals that are often ...

The nature of starting materials and the condition of polyurethane (PU) preparation are regarded as the main general parameters that determine PU thermal resistance. The effect of structure and presence of additives were identified as the major general factors on this regard. Structural factors...

С использованием ИК-, ЯМР одномерных (1Н, 13С) и двумерных (HSQC, HMBC) спектров установлены строение и соотношение региоизомеров пиридилзамещенных 2-амино-5,6,7,8-тетрагидро-4Нхромен-3-карбонитрилов и их иодметилатов. Методом колоночной и ВЭЖ хроматографии разделены региоизомерные...

Методами одномерной и двумерной ЯМР спектроскопии (1H, 13C, HMBC, HSQC, NOESY-2D), ИКспектроскопии охарактеризованы новые полизамещенные (поли)гетероциклические спиросоединения, определены их строение и структурные особенности.

The objective of this study is to determine the possibility of oxidation of the fraction of oil refining gases containing not only isobutene but also n-butene and propene on the proposed catalyst without separating C4 hydrocarbons. According to the data obtained, isobutene has the highest...

Цифрлық жүйелер мен веб-қолданбалар күнделікті өмірде және бизнесте шешуші рөл атқаратын қазіргі заманғы ақпараттық технологиялар әлемінде бұл жүйелердің қауіпсіздігін қамтамасыз ету маңызды міндетке айналды. Көптеген пайдаланушылар құпия деректерді өңдейтін веб-қолданбалармен өзара әрекеттеседі...

This article describes the properties of natural materials coal, chalk, sanguine, sauce. Many properties of materials have long been known to mankind. And artists from all countries have used them in their work since ancient times. However, talented children with disabilities do not always use them ...

This article studied the characteristics of vermiculite sourced from the Tebinbulok mine situated within the borders of the Republic of Uzbekistan, as well as the most favorable conditions for its activation through heating and treatment. A 7% solution of hydrochloric acid was used for activation....

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: In the present study, office waste paper was employed as feedstock for bioethanol production. Lignocellulosic material was pre-treated with dilute sulphuric acid (5 %) to release monomeric sugars. Acid pretreatment of waste papers was carried out at different ratios of 10, 15, and 20 ml for each...

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Copper-tin and copper-antimony chalcogenides have received increasing attention as promising thermoelectric materials due to their high efficiency and low toxicity. Many of these phases are synthetic analogues of natural copper chalcogenide minerals and have been drawing more interest for the...

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The possibility of electrochemical deposition of tin‒bismuth alloy with an increased tin quota which is in demand for microassembly in electronics was revealed. Modification of the acid EDTA electrolyte with hydroxyl-containing surfactants differing in the length of hydrocarbon chain and the number ...

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Removal of paracetamol from aqueous solution onto carbon material obtained from nectarine kernel by the original technology was studied in this work. Process performance was observed by varying the experimental features, such as retention time, particle size, adsorbent dose, solution pH, and...

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The aim of the work is the synthesis of monoand binuclear complexes of platinum (II) and palladium (II) containing terminal and bridging atoms of chlorine and sulfur as ligands and the study of their biological activity in relation to test cultures of Bacillus subtilis B4647, Aspergillus...

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A series of fused heterocyclic compound triazolotetrazine were prepared from the reaction of equimolar amount of 4-amino-5-phenyl-4H-1,2,4-triazole-3-thiol via cyclization addition reaction with different aromatic aldehydes in presence of piperidine as catalyst to produce the target...

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The impact of the depth of selection of narrow gas oil fractions of Azeri-Chirag-Guneshli oils on the yield and quality of catalytic cracking products was studied. The impact of fractional and group hydrocarbon composition on the main directions of cracking is analyzed. 5 types of gas oil fractions ...

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Environmental pollution with heavy metals is a problem of worldwide importance due to their toxicity and potential health risks. Among the heavy metals found in industrial waters are such toxic metals as Cd(II), Zn(II), and Cr(VI). In this study, the potential of Georgian natural and modified...

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The effect of calcination temperature in air of finely dispersed boehmite powders with ferrocene adsorbed at room temperature from n-hexane solution on X-ray diffraction patterns and EPR spectra of calcined samples was studied. It has been shown that calcination in air of boehmite samples with...

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This study included the preparation of Schiff base derivatives (Z1-Z5) derived from 2bromoisophthaladehyde with aniline substitutes. By the reaction of prepared compounds with sodium azide using dioxane as a solvent a pentacyclic rings derived from tetrazole (Z6-Z10) were obtained. The prepared...

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The effectiveness study results related to "soft" multi-stage crushing mode of concrete scrap are presented. During the research it was found that the processing of concrete scrap using this technology can significantly improve the characteristics of the secondary concrete aggregate, namely...

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