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 study examines how clay content affects the vacuum filtration and subsequent air drying of fine-grained quartz sand intended for silicate production. Laboratory experiments compared original sand, partially washed sand, and nearly clay-free sand using a Büchner-type filtration setup under const…
This study examines how sodium humate solutions affect the cohesion, shear strength, and compactability of moistened marshalite during granulation. Marshalite samples were wetted with water or humate solutions of varying concentration, then tested for shear strength under different moisture contents…
This study examines how surface films of humic substances affect the interaction of water with quartz sand and the resulting aggregate properties relevant to dewatering and granulation. Using fine-grained Tugan quartz sand, the authors compared natural sand containing humic films with sand washed in…
This paper reports laboratory experiments on reducing iron impurities in nepheline-bearing rocks from Krasnoyarsk Krai, where iron occurs as magnetic minerals, iron-bearing silicates, and hydroxides. The study compares gravity concentration, electromagnetic separation, and subsequent flotation of th…
This paper examines the use of an oil emulsion waste product from ultrasonic purification of crude anthracene as a flotation collector for talc from the Alguy deposit. Laboratory flotation tests were conducted in neutral tap water using a Mekhanobr flotation machine, and results were compared with f…
This study examines how selected additives affect both settling and filtration in the dewatering of coal slurries, treating flocculation and filtration as linked stages of a single process. Using slurry from the Chertinskaya coal-preparation plant, the authors tested carboxymethyl cellulose, polyacr…
This paper examines chemical interactions among components of a high-boron glass batch during moist granulation and low-temperature drying, with attention to reducing boric acid and alkali volatilization during early glass melting. The authors compare granulated S49-1 glass batch with evaporated aqu…
This paper examines the solid phase interaction of ilmenite with calcium carbonate as a basis for using local raw materials in calcium titanate production. Pressed mixtures of FeTiO3 with calcium carbonate in stoichiometric ratios corresponding to FeTiO3:CaO of 1:1, 1:2, and 1:3 were fired at differ…
This study examines how titanium dioxide additions influence crystallization, sintering, and structure formation in pressed powder articles made from glass of steatite body composition during firing. Glasses containing 0.02 to 4.0 percent TiO2 were melted, ground, formed with a paraffin binder, bisc…
This paper examines the apparent structural viscosity of Tomsk Oblast loams during heating to the pyroplastic state relevant to expanded clay formation. Ring specimens from five deposits were heated at a controlled rate, deformed under load, and evaluated by a static calculation method to relate vis…
This study examines how the particle size of the crystalline MgSiO3 phase affects polymorphic transformations and aging in steatite ceramics. Steatite bodies were synthesized from clinoenstatite fractions of different grain sizes and barium aluminosilicate glass, then fired at 1150 to 1250°C and ana…
This paper examines the low-temperature polymorphic behavior of magnesium metasilicate in steatite ceramic articles, focusing on the metastable presence of protoenstatite at ordinary temperatures and its transformation into clinoenstatite. Using X-ray diffraction, petrographic analysis, and differen…
This study evaluates the hydrocyclone product obtained during processing of the kaolinized sands of the Tugan ilmenite-zircon deposit as a raw material for semi-acid refractories. Chemical, grain-size, and ceramic properties were characterized, and laboratory specimens were produced using fired grog…
This study examines processing conditions for dense lime-sand facing tiles made with finely ground quicklime capable of hydration hardening. Experimental mixes using plant sand and factory quicklime were varied by lime activity, water to lime factor, holding time before molding, holding time before …
This study examines how autoclave treatment conditions affect structure formation and quality in dense silicate facing tiles made from lime sand mixes. Specimens of differing mix activity and compaction pressure were aged, steam cured under varied maximum pressures and holding times, and evaluated f…
This paper examines the use of clay-rich fine sands from the Kopylovo plant and similar deposits for sand-lime brick production, focusing on whether beneficiation can improve product quality. Laboratory and semi-industrial tests evaluated washing and hydrocyclone separation to remove clay, followed …
This paper develops preparative procedures for vanadium dioxide and vanadyl bromide crystal hydrate, motivated by the use of vanadium compounds in redox catalysis and as starting materials for further preparations. Vanadium dioxide was synthesized by reducing vanadium pentoxide with oxalic acid in a…
The paper describes the use of interferometry for rapid determination of temporary water hardness, motivated by the method’s ability to measure solution concentrations accurately with limited time expenditure. Because the approach requires a constant relative salt composition, measurements were perf…
This paper develops an extraction photometric procedure for determining trace perchlorate ions in water using Brilliant Green with benzene as the extractant. The authors optimize extraction conditions, reagent excess, wavelength selection, and calibration, finding that three benzene extractions give…
A sorption-photometric procedure is described for determining trace copper and iron from a single sample of materials used in phosphor production, including luminophor L-34, hydrochloric acid, calcium carbonate, and ammonium and calcium hydrogen phosphates. The method decomposes samples in concentra…
This study examines anion-exchange separation and concentration of trace copper in hydrochloric acid media, with attention to simultaneous determination of copper and iron impurities in materials used for phosphor production. Copper sorption and desorption were tested on AN-2F and ceralite FF anion …
This paper describes a photometric procedure for determining small amounts of titanium in perchloric acid using hydrogen peroxide as the color-forming reagent. The method is based on formation of a yellow titanium peroxide complex in strongly acidic solution, with phosphoric acid added to mask possi…
A photometric method is described for determining trace titanium in perchloric acid, ammonium and sodium perchlorates, and L-34 phosphor using diantipyrylmethane. Because perchlorate ions interfere by forming a precipitate with the reagent, titanium is separated from perchlorate media as hydroxide w…
A polarographic method is developed for determining microquantities of titanium in perchloric acid, sodium perchlorate, and ammonium perchlorate, addressing the laboriousness of earlier procedures based on preliminary complex synthesis. Several supporting electrolytes were tested, and an oxalic acid…
This paper develops and tests a pendant drop method for determining the absolute interfacial tension of mercury in electrolyte solutions while simultaneously measuring the differential capacitance of the electrical double layer. A glass electrochemical cell, photographic drop shape analysis, and imp…
This paper examines the determination of liquid surface and interfacial tension from the contour of axisymmetric pendant drops, with particular attention to mercury in vacuum. It analyzes a multi-level diameter-ratio method for evaluating drop shape, discusses the influence of alignment and coordina…
This paper examines the determination of trace zinc, cadmium, and indium in high-purity lead by amalgam polarography with accumulation, a task hindered by the large lead matrix. The authors investigate preliminary electrolytic separation of lead from nitric acid solution as anodically deposited lead…
A procedure is developed for determining trace indium impurities in lead by amalgam polarography with accumulation on a film electrode. The method combines preliminary extraction of indium from weakly acidic solutions with alkylphosphoric acids, removal of lead by nitric acid reextraction, transfer …
This study evaluates the separation of trace impurities during precipitation of lead as lead sulfate, a preliminary concentration step used when direct analysis of high-purity lead is insufficiently sensitive. Using radiometric measurements of labeled cobalt, antimony, cadmium, zinc, sodium, thalliu…
This paper develops an electrolyte replacement procedure for the APN method using a mercury film electrode, with the aim of reducing impurity losses during transfer while retaining the film electrode’s higher sensitivity and resolving power. The authors examine losses for lead, indium, cadmium, zinc…
The study examines formation and behavior of the CdAu intermetallic compound in the cadmium, gold, and mercury ternary system using the APN method. Measurements of cadmium anodic notch depth as a function of electrolysis time were made at fixed metal concentrations and varying Cd:Au ratios, with add…
This paper develops a theoretical estimate of the resolving power of amalgam polarography with accumulation on a mercury film electrode, a method noted for greater sensitivity and separation capability than the stationary mercury drop. Considering the limiting case of a thin mercury film, slow linea…
This paper develops theoretical estimates for the minimum impurity concentrations measurable by anodic amalgam polarography with a constant electrode potential. Using the current time relation for linear semi-infinite diffusion after charging of the electrical double layer, the authors derive expres…
This paper develops constant-current voltammetric relations for electrode processes preceded by a first-order reversible chemical reaction under semi-infinite spherical and cylindrical diffusion. By solving diffusion equations with kinetic terms and appropriate boundary conditions, the authors deriv…
This paper derives voltammetric relations for electrode processes followed by first-order chemical reactions under semi-infinite spherical and cylindrical diffusion. It formulates surface concentration expressions for oxidized and reduced species, then substitutes them into the Nernst equation to ob…
This paper derives chronopotentiometric equations for reversible anodic oxidation of a metal and of an amalgam at constant current when a single metal complex is formed under spherical diffusion conditions. Starting from the Nernst relation, complex instability equilibrium, and diffusion expressions…
A calculation method is presented for anodic amalgam voltammetry at constant current using mercury film and spherical electrodes for elements whose amalgams undergo reversible oxidation. Starting from previously derived potential, time relations for reversible electrode processes, the authors obtain…
This paper examines the resolving power of constant current anodic amalgam voltammetry on a spherical mercury electrode, particularly when equilibrium potentials of different amalgam components are close enough for chronopotentiograms to overlap. The authors define resolving power through the potent…
This paper develops a theoretical treatment of anodic amalgam voltammetry at constant current on a spherical electrode. By solving the diffusion boundary-value problem, the authors derive expressions for surface concentrations, transition time, and potential-time curves for reversible, irreversible,…
This paper derives estimates for the minimum impurity concentration determinable by anodic amalgam voltammetry at constant current using a spherical mercury electrode. Starting from the transition time relation for diffusion in the electrode, the authors evaluate the effect of capacitive double laye…
This paper develops theoretical relations for anodic amalgam voltammetry with programmed current at a spherical mercury electrode, with comparison to film electrodes. Starting from concentration distributions for reduced and oxidized forms under diffusion-limited conditions, it derives expressions f…
This paper develops a theoretical description of constant-current anodic amalgam voltammetry at a mercury film electrode. By solving Fick diffusion equations with appropriate boundary conditions, the authors derive potential-time relations for reversible, irreversible, and quasi-reversible electrode…
The article examines an inverter for frequency-controlled AC drives supplied from an unregulated DC source, with output voltage regulated by pulse-width, or frequency-pulse, modulation. It describes a three-phase bridge inverter with a thyristor interrupter, analyzes its switching intervals for acti…
This paper examines a single-phase parallel thyristor inverter intended to produce an approximately sinusoidal 50 Hz output voltage. It argues that, for a fixed output frequency, the practical way to reduce distortion is to connect series resonant L-C filter sections tuned to suppress selected odd h…
The paper develops a calculation procedure for a ferroresonant filter stabilizer intended to protect an inverter from overloads while converting a rectangular output voltage into a stabilized sinusoidal voltage. Using an equivalent circuit, an approximated magnetization curve, and sinusoidal assumpt…
This paper describes a control scheme for a standalone inverter used in frequency converters for asynchronous motor speed control, focusing on pulse-width regulation with an unregulated direct-current source. It presents the structure of the frequency and voltage control channels, including a variab…
This paper analyzes a self-commutated thyristor inverter based on a parallel independent inverter circuit without a separate master oscillator, intended primarily for fluorescent lighting supplies. It describes the operating sequence, commutation process, and control-current formation, deriving expr…
This paper examines voltage regulation in an autonomous inverter supplying an induction motor, treating the inverter motor system as a nonlinear control object that can be analyzed through small-signal linearization around steady operation. It formulates linearized relations for inverter voltage and…
This paper examines reduction of startup time in an asynchronous gyroelectric motor, where readiness of a gyrosystem is largely determined by gyromotor acceleration. It argues that conventional elevated-voltage starting is not time optimal because motor torque varies during acceleration, and develop…
This paper examines criteria and circuit structures for regulating or stabilizing the output voltage of low-power static AC converters. It argues that static accuracy and the conventional stabilization coefficient are insufficient for many converter stabilizers because inertial elements transmit rap…
