Digital Commons Network^™

Production Of Organo-Mineral Fertilizing Ameliorants Based On Phosphogypsum, Central Kyzylkum Phosphorites And Biohumus, Temur A. Ospanov, Axmed M. Reymov, Rashid K. Kurbaniyazov, Jaxanger M. Bisenbaev

CHEMISTRY AND CHEMICAL ENGINEERING

Phosphogypsum, a large-scale industrial by-product generated during phosphoric acid production, poses significant environmental challenges due to its accumulation and potential ecological impact. This study investigates the utilization of phosphogypsum as a raw material for producing fertilizing ameliorants in combination with Central Kyzylkum phosphorites and biohumus. Composite mixtures were prepared and granulated using a 30% ammonium sulfate solution as a binding agent. The chemical composition, phase structure (XRD), and microstructure (SEM–EDS) of the obtained materials were analyzed. The results demonstrate the formation of calcium phosphate and sulfate phases, including CaHPO4·2H2O, β-Ca3(PO4)2, and CaSO4·2H2O, which contribute to both fast- and slow-release nutrient …

Processing Of Wc–Co Waste With Selective Extraction Of Co3o4 By Oxidative Fusion In Nano3 Melt, Ilyos A. Bozorov, Aziz B. Ibragimov, Odiljon E. Abdurakhmonov, Mastura Kh. Aripova, Sherzod E. Abdurakhmonov

CHEMISTRY AND CHEMICAL ENGINEERING

The aim of this study was to develop and experimentally validate a selective method for producing high-purity cobalt oxide from WC–Co hard alloy waste using oxidative fusion in a sodium nitrate (NaNO₃) melt, followed by combined aqueous and acidic purification of the solid residue. Cemented carbide scrap and waste containing 6–12 wt.% Co were used as feedstock, without prior grinding. It was found that, during heat treatment in the range of 650–900 °C, tungsten predominantly converts into soluble sodium tungstates, while cobalt concentrates in the solid residue as an oxide phase. Optimal process conditions, such as 850°C and …

Temperature-Dependent Electrocatalytic Activity Of Mxene For Hydrogen Evolution Reaction., Javlonbek I. Mamanazirov, Shavkat I. Mamatkulov

CHEMISTRY AND CHEMICAL ENGINEERING

This study represents the synthesis technology of MXene catalyst for hydrogen evolution reaction (HER) and investigates the temperature-dependent electrocatalytic activity of MXene-based catalysts in alkaline media. Using a three-electrode configuration in 1M KOH, the electrochemical performance was systematically evaluated across a temperature range of 25 °C to 40 °C. Linear sweep voltammetry (LSV) results demonstrate a significant enhancement in catalytic efficiency at elevated temperatures, evidenced by a consistent shift in polarization curves toward lower potentials. Specifically, the overpotential required to achieve a current density of 10 mA/cmІ decreased from 257 mV at 25 °C to 203 mV at 40°C, marking …

Features Of Formation Of The Structure And Properties Nonfritted Glazes For Sanitary Ceramic Products, Ivan A. Levitskii, Mihail V. Dyadenko, Valery G. Luhin

CHEMISTRY AND CHEMICAL ENGINEERING

The results of research on the formation of nonfritted glass-ceramic coatings for sanitary ceramic products are presented. The synthesis was carried out in a multicomponent raw material mixture including pegmatite, chalk, quartz sand with a constant content of zirconium silicate, talc, wollastonite, zinc whitewash, refractory clay and kaolin. Glazes were obtained by single firing at a temperature of 1200±5 °C for a duration of 20 hours. Samples of coatings were obtained, the processes of glaze formation were studied, the fusibility of glazes was assessed, and their physico-chemical properties were studied in relation to the features of the formation of the …

Fiber-Optic Products Based On Borosilicate Glasses, Mihail V. Dyadenko

CHEMISTRY AND CHEMICAL ENGINEERING

The research results of the development of glass compositions for a light-guiding core, reflective and protective coats of optical fiber using a stack method are presented. The optimal ratio of glass-forming oxides and modifications in their compositions has been determined, which ensures the resistance of glasses to crystallization during the manufacture of optical fiber, its thermomechanical strength, the required geometry of optical fibers and the light transmission of fiber-optic products, amounting to 60–75%.

The influence of the chemical composition of the glasses of the light-guiding core and the light-reflecting coats on their refractive index, which determines the magnitude of the …

Synthesis Of Nanostructured Yttrium Oxide Luminescent Powders Activated By Terbium Ions, Eygeniy N. Poddenezhny, Andrei A. Boiko, Olga S. Nevzorova, Ekaterina E. Trusova, Vladimir S. Urbanovich

CHEMISTRY AND CHEMICAL ENGINEERING

The aim of this work is to synthesize nanostructured luminescent powders of yttrium oxide doped with terbium ions. Y₂О₃:Tb³⁺ powders were obtained by thermochemical synthesis (combustion). The sources for the synthesis were nitric acid salts of yttrium and terbium. Organic acids, citric acid and acetic acid, were used as reducing agents and combustible components. It has been established that large porous aggregates with sizes up to 200 microns are formed with citric acid during combustion, and nanostructured finely dispersed powders consisting of nanocrystalline particles with sizes of 39±5 nm are formed with …

الفائدة, إدمون نديم شماس

Proche-Orient, Études juridiques

No abstract provided.

La Compétence Internationale Des Juridictions Dans Les Litiges Nés De Contrats Administratifs Internationaux, Rita Waked

Proche-Orient, Études juridiques

No abstract provided.

Le Régime Juridique De La Tacite Reconduction En Droit Libanais, Krystel El Hajj

Proche-Orient, Études juridiques

No abstract provided.

La Position Contractuelle Sur Les Marchés Financiers, Gisèle Zouein

Proche-Orient, Études juridiques

No abstract provided.

L'Impérativité Face À La Liberté De Créer Toutes Actions Dans Les Sociétés Anonymes, Joséphine Hage-Chahine

Proche-Orient, Études juridiques

No abstract provided.

الإجتهاد اللبناني, Poej

Proche-Orient, Études juridiques

No abstract provided.

Le Droit Au Travail Dans Les Pays Du Moyen-Orient, Georges Kadige

Proche-Orient, Études juridiques

No abstract provided.

La Résolution Des Conflits Positifs De Nationalités En Droit International Privé Libanais, Lina Charbel

Proche-Orient, Études juridiques

No abstract provided.

Les Actions De Préférence Émises Par Les Banques Libanaises, Aline Tanielian

Proche-Orient, Études juridiques

No abstract provided.

Le Rôle Du Juge Constitutionnel Libanais Dans La Sauvegarde Des Droits Processuels Fondamentaux, Salim Jreissati

Proche-Orient, Études juridiques

No abstract provided.

فهرس هجائي وتحليلي للمقالات الحقوقيّة : فهرس هجائي وتحليلي للمؤلفين - الشرق الأدنى، دراسات في القانون ١٩٦٤-٢٠١٠, Nada Corbani Akl, Abla Abi Nader

Proche-Orient, Études juridiques

No abstract provided.

فهرس هجائي وتحليلي للمقالات الحقوقيّة : فهرس هجائي وتحليلي للعناوين - الشرق الأدنى، دراسات في القانون ١٩٦٤-٢٠١٠, Nada Corbani Akl, Abla Abi Nader

Proche-Orient, Études juridiques

No abstract provided.

فهرس هجائي وتحليلي للمقالات الحقوقيّة : فهرس هجائي وتحليلي للمواضيع - الشرق الأدنى، دراسات في القانون ١٩٦٤-٢٠١٠, Nada Corbani Akl, Abla Abi Nader

Proche-Orient, Études juridiques

No abstract provided.

Tables Analytiques Des Titres Et Des Auteurs : Index Des Auteurs - Poej 1945-2010, Nada Corbani Akl, Abla Abi Nader

Proche-Orient, Études juridiques

No abstract provided.

Tables Analytiques Des Titres Et Des Auteurs : Index Des Titres - Poej 1945-2010, Nada Corbani Akl, Abla Abi Nader

Proche-Orient, Études juridiques

No abstract provided.

Introduction, Nada Corbani Akl, Abla Abi Nader

Proche-Orient, Études juridiques

No abstract provided.

Tables Analytiques Des Titres Et Des Auteurs : Index Des Matières - Poej 1945-2010, Nada Corbani Akl, Abla Abi Nader

Proche-Orient, Études juridiques

No abstract provided.

De La Forme Significative Dans Le Discours Juridique : Contribution À La Méthodologie Du Droit, Nada Kfouri Khoury

Proche-Orient, Études juridiques

No abstract provided.

Avant-Propos, Ibrahim Najjar

Proche-Orient, Études juridiques

No abstract provided.

الإجتهاد اللبناني, Poej

Proche-Orient, Études juridiques

No abstract provided.

Le Parlement Arabe, Gilbert Aoun

Proche-Orient, Études juridiques

No abstract provided.

Les Testaments Consulaires, Gilbert Aoun

Proche-Orient, Études juridiques

No abstract provided.

Le Contrat De Jeu Et De Pari En Droit Civil, Imad Nahas

Proche-Orient, Études juridiques

No abstract provided.

L'Originalité Du Régime Juridique De L'Exécution Des Actes De Commerce, Georges Naffah

Proche-Orient, Études juridiques

No abstract provided.