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
The paper addresses the estimation of maximum transient currents and torques in AR series squirrel cage induction motors used for roller table drives, where frequent starting, reversal, and braking can produce large short term stresses. After noting limitations of existing approximate formulas for g…
This paper addresses automatic selection of elevator operating modes under random passenger flows, especially peak periods dominated by upward or downward travel. It formulates mode switching as a decision problem based on passenger-flow asymmetry, using measurable proxy parameters to estimate condi…
The paper develops a Monte Carlo simulation algorithm for elevator group control systems treated as single-phase, multiline queueing systems with waiting, finite service devices, Poisson arrivals, arbitrary routes, and unknown service-time distributions. It formalizes passenger requests and elevator…
The paper addresses routing of wiring connections in computing device design when each contact may have at most two incident wires, reducing the task to constructing a near minimal closed chain, or an open chain with prescribed endpoints, through all vertices. It proposes a heuristic algorithm that …
The paper addresses the problem of optimally covering computing-device circuits with blocks drawn from a unified set, where each block contains specified combinations of standard structures and is treated as an indivisible unit. It formulates the covering task as an integer linear programming proble…
This paper addresses operational calendar planning for one-off and small-batch production, where changing product ranges and heterogeneous routes make monthly programs, launch and release schedules, and equipment loading difficult to coordinate. It proposes selecting planning criteria through statis…
This paper describes a logic control system for a photographic seismic-section output device intended for BESM-4 and Minsk-22 digital computers. The authors motivate the need for high-speed analog presentation of digitally processed geophysical data and outline a CRT-based plotter that records seism…
This paper examines requirements and error characteristics of a digital-to-analog converter intended for digital processing of seismic information. It argues that seismic signal processing benefits from digital methods such as filtering, stacking, and deconvolution, making high-speed and accurate an…
This paper describes a photorecorder designed to operate with general-purpose electronic digital computers for producing photographic seismic sections from digitally processed seismic traces. It outlines the recorder architecture, including digital-to-analog conversion, filtering, gain control, cath…
This paper examines the measurement error introduced by the passive R-C differentiating circuit in a mechanoscope used to record dynamic and static mechanical characteristics of asynchronous electric motors. It decomposes the motor speed during starting into slowly varying, aperiodic, and alternatin…
The paper examines transient short-circuit behavior in the output circuit of a compensated ferromagnetic frequency tripler, where nonlinear magnetic characteristics and series compensation capacitors can produce hazardous currents and overvoltages. Using an approximate analytical model based on a cu…
This paper addresses stabilization of the output voltage frequency of electromechanical converter units using a synchronous generator driven by a separately excited direct-current motor, particularly under severe operating conditions with fluctuating supply voltage and load. After reviewing limitati…
This paper discusses current sensors and comparison devices for relay automatic current-control systems, where sensor delay and comparator hysteresis strongly affect current pulsations and control quality. It formulates requirements for sensors used in high-current, reversible, and multi-mode circui…
The paper examines relay automatic control systems for stabilizing and regulating direct-current motor currents, especially in starting, braking, and field-weakening modes using contactless switching elements such as thyristor switches. It formulates dynamic models for armature-current regulation, a…
This paper describes a high-precision AC electric drive intended for applications requiring long-term speed deviations no greater than about 0.01 to 0.001 percent. The proposed system uses a synchronous-reactive motor supplied by a thyristor inverter whose frequency is derived from a quartz master o…
This paper examines how armature and field electromagnetic time constants affect time-optimal control of a DC motor under voltage, current, and speed constraints. Using Pontryagin’s maximum principle, it derives control laws for armature voltage and magnetic flux for independently excited motors, in…
This paper examines static frequency converters for supplying electromagnetic drives of vibratory machines that require 25 Hz power from a 50 Hz network. It analyzes a known direct-coupled converter and proposes a simplified thyristor circuit for low power-factor active-inductive loads, where the op…
This paper develops a calculation method for electromagnetic processes in a six-phase compensating converter with an interphase reactor and two-stage forced commutation. Using piecewise-linear approximation and standard simplifying assumptions for high-power valve converters, it derives interval equ…
This paper analyzes how the spatial distribution of standing-wave energy in a composite optical resonator with a moving dielectric affects stimulated radiation generation. Using a quasistationary treatment of longitudinal resonator modes, it distinguishes stationary and sliding modes, derives the po…
This paper analyzes thermal distortions in solid state laser resonators whose neodymium glass active element has the form of a thin rectangular plate rather than a circular rod. Using thermoelastic relations for a free plate with a symmetric temperature distribution through its thickness, the author…
This paper studies linear equations for functionals involving higher order functional derivatives in normed spaces, with Cauchy data specified at a point. Using Frobenius-type complete integrability conditions, it formulates solvability criteria, including explicit conditions for a second-order equa…
This paper critically examines hypotheses that explain tectonic and paleogeographic features by an increase in the Earth’s volume, including models based on a declining gravitational constant and on accretion of cosmic matter into the Earth’s interior. Through quantitative estimates of orbital dista…
This paper examines how bentonite additions affect the pelletizing of iron ore concentrates and how the suitability of bentonites from different deposits can be evaluated. The authors argue that swelling capacity or electrokinetic potential of bentonite suspensions alone is insufficient, especially …
This study examines how the composition and fineness of an iron ore burden affect the amount of air entrapped in green pellets, a gaseous phase usually not measured in pelletizing practice. Pellets were prepared from iron ore concentrate with additions of limestone, bentonite, or magnetite slime und…
This study examines the solid phase decomposition of zircon concentrate from the Tugan deposit by calcium carbonate, focusing on the chemistry of interaction with the calcium oxide formed during sintering. Mixtures containing zircon and 1, 2, or 3 moles of calcium oxide were fired at 900 to 1300°C a…
This study examines how small additions of alkali metal oxides affect phase formation in high-purity talcs during firing, addressing contradictory reports on talc transformations that may arise from differences in impurities and morphology. Alguiskoye and Onotskoye talcs, with and without 2 percent …
This study examines phase formation in MgSiO3 synthesized by firing equimolar mixtures of amorphous silica and magnesium carbonate-derived oxide, focusing on how heat-treatment temperature, repeated firing, and crystal size affect the stability of protoenstatite and its transformation to clinoenstat…
This study examines the reported failure of urea to react directly with secondary aromatic amines and proposes that the reaction can occur in a weakly alkaline medium rather than under the acidic or strongly alkaline conditions commonly used. Conductivity measurements of carbazole and aniline soluti…
This study examines the coordination behavior of 9-acetylcarbazole and 3-acetylcarbazole in complexes with aluminum chloride, with and without hydrogen chloride, as part of work on the rearrangement of 9-acetylcarbazole to 3-acetylcarbazole. Infrared spectra measured in methylene chloride were compa…
This study examines an alternative synthesis of amides of 9-methylcarbazolecarboxylic acids, prompted by the inconvenience of carbamyl chloride and the absence of reported methods for 9-alkylcarbazole carboxamide derivatives. The authors test the reaction of 9-methylcarbazole with urea and find that…
The study examines chloromethylation of linear copolymers of 9-vinylcarbazole with styrene, focusing on the crosslinking that occurs during reaction with monochlorodimethyl ether in the presence of zinc chloride. Copolymers with varying carbazole content were prepared and evaluated by total and acti…
This study examines the synthesis, polarographic analysis, and Meerwein-Ponndorf-Verley reduction of aliphatic-aromatic ketones, with emphasis on carbazole and related aromatic or heterocyclic acetyl derivatives. Modified Friedel-Crafts and Fries rearrangement procedures were used to prepare monoace…
This study examines the preparation of anion-exchange resins from linear copolymers of styrene with 3-vinyl-9-alkylcarbazoles, proposed as an alternative to previously used cross-linked carbazole copolymers whose chloromethylation reduced exchange capacity. The authors investigate how swelling time,…
This paper examines how processing conditions and mineral additives affect the yields of chemical products formed during peat pyrolysis, with attention to possible peat based chemical metallurgical processes. More than 180 experiments were performed on two peat types and peat ore mixtures, varying f…
This paper describes an experimental setup for investigating fast chemical processes excited by electric fields, particularly in solids, within the broader context of high-energy chemistry. The authors present a three-unit system that enables controlled rectangular, oblique, constant, and slowly var…
This study examines the Friedel Crafts acetylation of 9-methylcarbazole to form 3-acetyl-9-methylcarbazole, focusing on how reagent addition order, reaction heterogeneity, and reaction time affect formation of the by-product 3,6-diacetyl-9-methylcarbazole. Using thin-layer chromatography to monitor …
This paper reports the synthesis of substituted urea derivatives intended for evaluation in the search for compounds with anticonvulsant activity. Primary amines, prepared by the Leuckart reaction, were condensed with nitrourea by the Davis method to obtain a series of aryl and alkyl substituted ure…
This study examines the use of Uzhur nepheline-bearing rocks from Krasnoyarsk Krai as raw material for foam glass production. Direct foaming of ground nepheline rock with silicon carbide produced nonuniform porous material and proved impractical because of a narrow sintering interval, so the authors…
This study examines the pyridine-piperidine reaction as a structural test for dyes, addressing conflicting interpretations of whether changes in color indicate triphenylmethane or quinoid structures. Pyridine solutions of dyes from several classes were treated with piperidine and their absorption sp…
This paper develops relations for analyzing irreversible discharge and ionization processes of complex ions at solid electrodes, motivated by the growing use of graphite and other solid electrodes in polarography and electroplating. Starting from Brainina’s equation for metal electro-dissolution and…
This paper describes a polarographic setup intended to reduce the masking effect of the nonlinear residual current in trace impurity analysis by amalgam polarography with accumulation. The authors propose combining a direct-current polarograph with an electronic compensator that first records the st…
A photometric procedure is described for determining trace silicon in high-purity tin at levels below the sensitivity of conventional silicomolybdenum blue extraction methods. The method decomposes a one-gram tin sample with hydrochloric and hydrobromic acids and bromine, removes tin and arsenic by …
This study examines optical sensitization of photoconductivity and photo-emf in lead, silver, and thallium azides stained with a range of organic photographic dyes. Photoconductivity under modulated illumination and capacitor photo-emf spectra were measured to identify sensitization regions, changes…
EPR spectra of electron irradiated potassium perchlorate single crystals were studied from low temperature to elevated temperature in order to clarify early and intermediate stages of radiolysis. Spectra recorded after irradiation at minus 155 degrees Celsius indicated at least two chlorine containi…
This paper characterizes the dolomites enclosing the Alguy talc deposit, focusing on their petrographic features, alteration, and chemical composition. Using thin sections from prospect pits and drill core, together with chemical and differential thermal analyses, it describes fine-grained dark dolo…
This paper quantifies the areal distribution of rock types and relates these measurements to gold occurrences and reserves in Mountain Shoria. Using planimeter measurements from geological maps, the author compares structural facies zones by calculating coefficients of effusiveness, mobility, and ma…
This paper characterizes the contact aureole of the Chanysh intrusion, a granodiorite, tonalite, and plagiogranite complex emplaced into Lower Cambrian effusive, volcaniclastic, and sedimentary rocks. On the basis of field relations, petrographic observations, optical mineral data, and mineral assem…
This paper reassesses the stratigraphy of the Precambrian carbonate complex of Gornaya Shoria, where earlier work grouped most limestone and dolomite units into the Kabyrza and West Siberian formations chiefly by lithology. Using field observations along the Kichi, Purla, Pyzas, and Mrassu river sec…
This paper presents a detailed stratigraphic, lithological, mineralogical, geochemical, and paleontological study of Quaternary deposits in the Novokuznetsk reference section on the right bank of the Tom River. Reexamination of natural outcrops and a 1967 quarry exposure clarifies the structure of t…
