SovietRxiv · Open Access in English
Rediscovering the Soviet scientific archive, in English
25357 full-text translations 14926 English PDFs 22539 abstracts
Showing 50 of 25357 papers
This article synthesizes published stratigraphic, tectonic, and geochronological evidence to outline the principal Precambrian folding epochs of the African Platform and relate them to metallogenic specialization. It distinguishes major stages in the formation and stabilization of African cratonic b…
This paper examines paragenetic mineral associations in gold-bearing quartz veins from the Sarala, Central, Komsomolsk, and Berikul ore fields of the Mariinsk Taiga and Khakassia. Using observations of crosscutting relations, hand specimens, microscopy, and published data, it reconstructs a staged h…
This paper describes the geological structure and stratigraphy of the Tataurovo brown coal deposit in Chita Oblast, located within the Chita Ingoda intermontane depression. On the basis of exploration boreholes, lithological observations, regional and local stratigraphic comparisons, and fossil flor…
This paper examines the interpretation of weak magnetic anomalies at magnetite deposits, where similar anomaly intensities may reflect either deep ore bodies or shallow magnetized host rocks. Using the Muryuk anomaly group as a case study, the authors combine petromagnetic measurements, correction f…
This paper investigates the extraction of humic acids and production of sodium humates from Vasyugan peat and Kansk-Achinsk basin brown coals for use as non-ballast binding additives in iron-ore pelletizing. Using a laboratory single-stage disperser, the authors varied alkaline solution concentratio…
This study examines the acetylation of 9-alkylcarbazoles with acetic anhydride or acetyl halides using small quantities of catalysts that do not form strong complexes with ketone products, addressing the high catalyst consumption typical of aluminum chloride Friedel-Crafts procedures. The authors co…
This study examines the application of the Leuckart reaction to 3-acetyl-9-ethylcarbazole as a route to aminoalkyl carbazole derivatives of potential physiological interest. Thin-layer chromatographic monitoring was used to compare reaction conditions, showing that conventional formamide, formic aci…
This study examines the photochemical behavior of 9-acetylcarbazole under ultraviolet irradiation, motivated by the expected distinctive reactivity of an acetyl group attached to nitrogen. Solutions of 9-acetylcarbazole in aliphatic alcohols, especially isopropyl alcohol, were irradiated with a merc…
This study reports the synthesis of new N-acyl derivatives of barbital, phenobarbital, and barbamyl as part of a search for barbiturate compounds with potential anticonvulsant activity and to examine the effect of substituents in the acyl residue. The barbiturates were acylated with acid chlorides o…
Nine azomethine derivatives of 4-aminoantipyrine were synthesized by condensation with substituted benzaldehydes, including five compounds not previously described, and characterized by yield, melting point, empirical formula, and nitrogen analysis. Their anti-inflammatory activity was evaluated in …
The study examines acylation of N-methyl-4-aminoantipyrine with benzoyl chloride, p-nitrobenzoyl chloride, and p-toluyl chloride, focusing on optimal reaction conditions, substituent effects, and base catalysis. Experiments in p-xylene identified 138 °C and 0.5 h as suitable conditions for noncataly…
This paper examines how the ore to peat ratio in peat-based fuel-smelting materials affects the reduction of iron oxides during shaft-furnace processing. Two laboratory smelting tests in a 200-liter shaft furnace compared briquettes made from magnetite concentrate and lowland peat with different rat…
This paper examines how iron oxides affect gas formation, especially hydrogen generation, during the pyrolysis of peat mixed with Bakchar iron ore. Using combined thermal analysis and chromatographic analysis of gaseous products under nitrogen, the authors compare peat with peat ore moldings across …
This study examines how adsorption of benzoic, enanthic, and caprylic acids affects cadmium discharge and ionization at a cadmium amalgam dropping electrode. Using polarographic measurements in sulfuric acid with cadmium sulfate, along with electrocapillary observations, the authors compare changes …
This paper examines whether the adsorption Psi1-potential can be represented as a simple power function of surface coverage for organic compounds adsorbed on mercury electrodes. Using a two-parallel-capacitor model of the double layer and published electrode-charge and adsorption data, the authors d…
This study examines the use of 9-ethyl-3,6-diaminocarbazole stearate as an additive in the sulfur vulcanization of SKS-30 ARM-15 oil-extended butadiene-styrene rubber with Altax as accelerator. The compound was synthesized from 9-ethylcarbazole through nitration, reduction to the diamine hydrochlori…
This study examines aliphatic mercaptans as plasticity regulators in the emulsion copolymerization of divinyl with alpha-methylstyrene for SKMS-30RP rubber, with the aim of increasing monomer conversion without impairing rubber properties. Experimental bottle polymerizations at 50°C compared several…
This study examines how common amine antidegradants affect the vulcanization behavior and physicomechanical properties of synthetic rubbers used in tires and technical rubber goods. Experimental compounds based on SKI-3, SKS-30 ARKM-15, and nairite were prepared with varied accelerator and vulcanizi…
This paper examines how adsorption of organic surfactants affects reversible anodic peaks at a stationary mercury drop electrode, assuming that adsorption changes mass transport rather than the charge-transfer step. Using Stromberg’s treatment of polarographic anodic-cathodic waves, the authors mode…
This paper develops a theory of reversible anodic and cathodic processes at stationary mercury film electrodes while accounting for the finite electrode thickness and asymmetric diffusion. Using a previously derived boundary condition for unsymmetrical diffusion, the authors obtain a general current…
This paper develops a theoretical boundary condition for reversible amalgam stripping polarography at stationary mercury film electrodes under asymmetric diffusion, where one phase is finite and the other is effectively semi-infinite. The authors formulate the diffusion problem for a reversible elec…
This paper analyzes mixed potentials and mixed currents in a nonequilibrium mixture of three electrochemical systems at an amalgam electrode. Extending earlier treatment of two coupled systems, it considers a principal irreversible oxidation-reduction system together with a more electropositive meta…
This paper addresses the numerical optimization of operating regimes in chemical reactors described by ordinary differential equations, with particular attention to determining optimal temperature profiles in ideal displacement reactors. Using the maximum principle, the reactor optimization problem …
This paper applies a linearization method to the estimation of unknown kinetic constants, including reaction orders, in homogeneous chemical reaction models from experimental concentration data. The approach iteratively solves the reaction differential equations together with sensitivity equations, …
This paper develops semiempirical formulas for estimating the minimum concentration determinable with a specified reliability in amalgam and film polarography with accumulation. Treating the problem as one of statistical hypothesis testing between blank and signal concentrations, the authors use the…
This paper examines the use of amalgam polarography with preconcentration for determining trace heavy metals in oil and petroleum products, with attention to zinc in oil and lead in gasoline. It develops a zinc procedure based on extraction as a dithizone complex into carbon tetrachloride, re-extrac…
This paper addresses the difficulty of identifying the onset temperature of peat thermal decomposition from derivatographic data when moisture removal and initial decomposition overlap on TG and DTG curves. Using formal kinetic equations for adsorbed water removal, treated approximately as a second-…
This study examines how finely dispersed iron oxide fillers affect shrinkage, moisture gradients, and crack formation during the drying of molded peat. Cylindrical peat specimens and peat mixtures containing magnetite concentrate or reactive iron oxide were dried under severe, intermediate, and mild…
This paper examines how adding an iron ore component alters the moisture content and rheological behavior of peat mass intended for peat ore material production. Using established relations between moisture content and limiting shear stress, together with calculations based on carbon to iron require…
This paper examines a general mass-transfer-theory basis for the standard conclusion that operation at the minimum liquid-phase flow rate, such as minimum reflux or minimum absorbent flow, requires an infinitely large phase-contact surface. It analyzes the number of transfer units when the operating…
This paper examines the utilization of finely dispersed iron-bearing sludge generated during aniline production at the Kemerovo Aniline and Dye Plant, most of which was being dumped despite its high magnetite content. The authors characterize the sludge composition, moisture properties, and pelletiz…
This paper examines the cooling of sheet rubber after calendering, identified as a production bottleneck at the Tomsk Rubber Footwear Plant because insufficient cooling causes delayed shrinkage, sticking of sheets, rejects, and possible prevulcanization. The authors analyze several heat exchange int…
This paper addresses temperature nonuniformity in the glass melt and forming ribbon during vertical drawing of sheet glass through a boat at the Anzhero-Sudzhensk Glass Plant. Based on thermocouple measurements in the conditioning zone and across the ribbon width, the authors identify several source…
This paper reports an experimental study of heat transfer and hydraulic resistance in a tube-in-tube heat exchanger, with attention to both inlet and stabilized sections under laminar air flow in an annular channel. Saturated steam at 100°C was supplied through the inner tube, while atmospheric air …
The paper examines drying regimes for granulated bulk materials composed of finely ground bauxite, technical alumina, and white electrocorundum sludges, focusing on radiation drying as a less studied alternative to conventional convective and contact methods. Experiments used a lamp radiation dryer …
This paper examines the use of the suspension effect to determine the sign of electric charge on particles in moist granulated charge materials for fluxed iron ore pellet production. The authors measured pH differences between suspensions and their filtrates for iron ore concentrate, limestone, bent…
This study examines the use of small additions of reagent K-4, the sodium salt of acrylonitrile acid, to improve vacuum filtration of finely dispersed magnetite concentrate. Laboratory filtration experiments varied reagent consumption, pulp agitation time, and filtration duration using concentrate f…
This study examines hydrolysis lignin as a moisture-absorbing plasticizer for pelletizing fine-grained magnetite concentrate from the Sokolovsko-Sarbai Mining and Beneficiation Combine, where conventional bentonite additions can reduce iron content and pellet strength. Dried and ground lignin from t…
This study examines how batch temperature affects the granulation of raw materials for window glass, focusing on the role of crystalline hydrate decomposition in improving plasticization and pellet formation. Production batch components from the Anzhero-Sudzhensk glass plant were granulated under or…
This paper examines whether capillary potential can serve as a preliminary indicator of the agglomerability of dispersed materials used in pelletizing and related processes. Using a modified Seker capillarimeter, the authors measured residual moisture under stepwise vacuum for magnetite concentrate,…
This study examines alternatives to direct sulfuric acid treatment for decomposing spent emulsions from copper rod drawing, a process that consumes substantial acid and yields dilute copper sulfate solutions that are difficult to process. The authors investigate preliminary decomposition using a cop…
This paper examines criteria for assessing the quality of oil-in-water emulsions used in copper wire rod drawing. It argues that plant indicators such as total fat content and alkalinity are not objective measures, because hydrolysis and reactions with residual copper sulfate can promote decompositi…
This study evaluates the foaming performance of several substances for air-mechanical fire-extinguishing foam, focusing on foam expansion and stability relative to the commonly used PO-1 foaming agent. Using the Ertikovsky method and GOST 6948-54 tests, the authors compare PO-1, aminonitroparaffin, …
This study examines how humic acids influence the flotation of purified ilmenite and zircon with several anionic and cationic collectors. Flotation tests on pure minerals were combined with colorimetric measurements of humic acid adsorption, with attention to collector type, humic acid concentration…
This paper examines wet granulation of finely dispersed ash from the Tomsk GRES-2 hydraulic ash dump for use as fired aggregate in concrete. It evaluates the water-physical properties and lump-forming ability of the ash, limestone, loam, and ash mixtures containing 20 percent limestone or loam, then…
This paper investigates the production of high-frequency ceramics with a diopside crystalline phase using tremolite from the Alguy deposit as the principal raw material. Ceramic bodies were prepared either from diopside synthesized from tremolite or directly from tremolite corrected with calcium car…
This study examines the use of ammonium dichromate as a soluble chromium source in alumina charges for producing chrome electrocorundum, addressing heterogeneity caused by poor mixing and segregation of alumina and chromium oxide powders. The authors argue that introducing ammonium dichromate soluti…
The study examines the sulfuric acid decomposition of magnesium fluoride, an endothermic process requiring more heat under standard conditions than the analogous decomposition of calcium fluoride. Differential thermal analysis combined with thermogravimetry was used to follow phase and mass changes …
This paper examines production of hydrogen fluoride from ammonium fluoride solutions through conversion to magnesium fluoride followed by sulfuric acid decomposition. The study measures decomposition of dried magnesium fluoride with 97.5% sulfuric acid over 100 to 300°C, analyzes fluorine content, a…
The paper examines a route for producing anhydrous hydrogen fluoride from fluorine-containing gases via ammonium fluoride solutions and intermediate magnesium fluoride. It proposes precipitating magnesium fluoride from ammonium fluoride using magnesium sulfate, with ammonium sulfate as a by-product,…
