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 paper examines how the parameters of damper windings influence the amplitude and waveform of short-circuit current in a single-phase synchronous shock generator. Using a mathematical model of the generator’s electromagnetic transients, the authors compare cases without damper windings, with a q…
This paper develops an analog-computer mathematical model for investigating electromagnetic transients in a single-phase synchronous shock generator with excitation and damper windings. Starting from emf equilibrium and flux-linkage equations under assumptions of constant winding resistances, no iro…
This paper analyzes how armature reaction affects the electromotive force of a single-phase shock generator during the initial period of a sudden short circuit. The authors formulate electromagnetic process equations for the stator, field, and damper windings, introduce an auxiliary measuring windin…
This paper reports additional experimental data on the mechanical reliability and commutation behavior of a transverse-field electric machine amplifier with a smooth armature. Using a 0.7 kW, 30 V prototype with a single-turn loop armature winding secured by bandages and epoxy resin, the study compa…
This paper proposes a frequency converter in which the mechanical commutator of an alternating-current commutator machine is replaced by a semiconductor collector. It describes a stationary winding with multiple taps connected through transistor or thyristor switching cells to a three-phase output c…
This paper presents a thyristor-based semiconductor direct-current collector intended to provide contactless commutation in electrical machines and to rotate the axis of a direct-current excitation magnetic field while the excitation winding remains stationary. The authors describe a symmetrical rin…
This paper describes the development and experimental study of a transverse-field electric-machine amplifier based on the EMA-12A that can supply direct current and multiphase alternating current either separately or simultaneously. The authors explain the machine as combining ordinary transverse-fi…
This paper proposes and analyzes a low-frequency inductive parametron that operates without direct-current biasing, intended for ground-fault protection in networks with compensated or isolated neutrals. The authors describe a two-core circuit in which excitation changes the inductance of a resonant…
This paper proposes using a low-frequency inductive parametron without DC biasing as the responding element for earth-fault protection in networks with compensated or isolated neutrals. The authors describe a circuit in which the phase of parametric oscillations is controlled by the active component…
This paper develops a simplified engineering procedure for techno-economic calculation of three-phase two-winding power transformers with coil-type windings, based on an earlier, more comprehensive optimization method. By introducing assumptions concerning conductor dimensions, current densities, th…
This article examines possible reserves for improving high-power transformers by reducing stray losses in clamping parts and tanks, which can form a substantial portion of short-circuit losses. It reviews design approaches including shell-type cores, nonmagnetic structural materials, and shielding, …
The paper evaluates the use of aluminum rather than copper windings in 110 kV three-phase two-winding power transformers rated from 2.5 to 40 MVA. Using techno-economic optimization formulas from earlier work and computer-based blind search over winding geometry variables, it compares calculated cos…
This paper presents a technical and economic optimization study of stationary single-phase two-winding power transformers, comparing core-type and shell-type magnetic circuits for ratings from 40 to 120 MVA and high-voltage levels of 110 and 220 kV. Using a cost function that includes manufacturing …
This paper examines methods for reducing electrodynamic forces in transformer windings under external short-circuit conditions, with emphasis on high-power and unit transformers. Using expressions for mechanical stress as a function of winding cross section and short-circuit impedance, it analyzes w…
This paper analyzes the distribution of electric potential over the rotor transporters of an electrostatic generator with cascade-connected conductor transporters and a semiconducting stator layer. Using partial-capacitance equivalent circuits and electrostatic analogy, it derives expressions for tr…
This paper examines the selection of compensating capacitance in pulse voltage sharpening circuits used with high voltage generators for electrohydraulic and related pulsed discharge applications. It derives formulas for the utilization factor of the discharge circuit as a product of the generator t…
This study examines whether thin high-strength polymer films produce a barrier effect in oil-impregnated paper insulation and how barrier material, position, number, field geometry, voltage type, and ionization conditions influence breakdown voltage. Experiments on cable-paper stacks impregnated wit…
The paper addresses the selection of impulse test-wave parameters for reproducing switching overvoltages on high-voltage insulation, a problem made more important by extra-high-voltage transmission and improved lightning protection. Reviewing published data for air and solid dielectrics and presenti…
This paper examines the origin and stratigraphic position of Precambrian microquartzites on the southwestern margin of the Kuznetsk Alatau, a problem important for interpreting regional stratigraphy and for prospecting bedded phosphorites. On the basis of two years of geological observations in the …
This paper examines the hydrolysis of 3,8-dimethoxy-4,5-6,7-dibenzo-1,2-dioxacyclooctane obtained by ozonolysis of low-percentage technical phenanthrene. The authors vary alkali concentration, dimethoxy peroxide to alkali ratio, and methanol content in aqueous and alcoholic potassium hydroxide syste…
This paper examines the determination of rock density at the Itatsky lignite deposit using attenuation of gamma radiation as a faster alternative to standard bulk-density methods needed for open-pit slope stability calculations. The authors describe the physical basis of the method, the scintillatio…
Laboratory experiments were conducted to clarify how technological drilling parameters depend on bit design, axial pressure, rotational speed, and rock properties. Using a ZIV-75 drilling unit with TP-3 and MR-6 carbide core bits, the study measured circumferential force, axial load, torque, drillin…
This paper reviews early evidence for petroleum indications in Primorsky Krai, where systematic oil and gas exploration had begun only recently and no natural surface seepages had been observed. It describes documented bitumen and oil shows in Mesozoic and Cenozoic rocks, with particular attention t…
This paper reinterprets the age, genetic affiliation, and spatial controls of gold ore deposits in the northern Kuznetsk Alatau, challenging their common attribution mainly to pre-Devonian granodiorites. Using structural, stratigraphic, magmatic, and mineralization relationships, it links the princi…
This paper describes apatite in trachydolerite sill rocks from the middle Gorbiachin River area of the northwestern Siberian Platform, with attention to its abundance, crystal morphology, inclusions, deformation, and relations to associated minerals. Petrographic observations show that apatite occur…
This paper examines disputed problems in the Cambrian biostratigraphy of the Krasnoyarsk Ridge, especially the lower boundary of the Cambrian, the subdivision of the Lower Cambrian, and the stratigraphic sequence of major local formations. Using field observations, fossil finds, and comparison with …
This paper examines the migration of gold in natural waters and its implications for hydrogeochemical prospecting of gold ore deposits. Field investigations from 1961 to 1964 at gold sulfide deposits in Eastern Transbaikalia, Kuznetsk Alatau, Gorny Altai, and Rudny Altai are compared with laboratory…
This paper reports engineering-geological investigations of the western part of the Berezovsky brown-coal deposit in the Kansk-Achinsk Basin, undertaken to characterize rock properties relevant to planned large open-pit mining. Based on 24 boreholes, 260 monolith samples, laboratory testing of physi…
This paper reexamines the oldest sedimentary cover of the Zeya-Bureya Depression using evidence from two deep boreholes that penetrated the Mesozoic deposits and upper crystalline basement. It describes the lithology, mineral composition, stratigraphic position, and spore-pollen assemblages of the n…
This paper evaluates the depth prospects of the Rudny Kaskad magnetite deposit using magnetic survey interpretation, rock magnetic properties, and comparison of observed and theoretical magnetic fields. It argues that weak anomalies of about 2000 to 2500 gammas, previously attributed to diorites or …
Detailed mapping and lithological study near Yuliya and Katyushkina in the Batenev Ridge provide new stratigraphic, paleontological, and lithological evidence for Upper Precambrian and Lower Cambrian deposits. The authors distinguish a provisional Kurenin Series above the Precambrian Goldzhin and Lo…
This paper addresses the problem of estimating the unmeasured lower trajectory of exploratory wells when curvature measurements are unavailable because of borehole diameter limitations or accidents. It critiques common extrapolation practices and proposes methods based on empirical regularities of z…
The paper addresses the profiling of naturally curved boreholes in percussion drilling for directional exploration, including determination of collar zenith angles and setting-out positions needed to intersect ore bodies at prescribed angles. It models borehole curvature in the vertical plane as a l…
The paper addresses the determination of oil well curvature intensity over a measured interval, defined as the angle between borehole directions at the interval endpoints. It argues that separate analysis of changes in zenith angle and azimuth can give misleading assessments for casing failure or pu…
This paper examines the shear resistance of argillites, siltstones, and sandstones from the Itat brown coal deposit in order to support engineering-geological assessment of open-pit slope stability. Field tests were conducted in natural slope outcrops along the Barandatka River using an extrusion me…
This paper examines the age and possible relationship of rare syenites, quartz syenites, syenite porphyries, and feldspar metasomatic bodies in the northern Yenisei Ridge. It describes their occurrence, petrography, mineral assemblages, and alteration features, then applies lead isotope geochronolog…
This paper examines the oxidation coefficient F, defined as the Fe2O3 to FeO ratio, in rocks of the Verkhne-Kondomsky granodiorite massif in Mountain Shoria. Using chemical analyses of fresh intrusive rocks, metasomatic varieties, and dike formations, it compares F across the main granodiorite phase…
The paper addresses the processing of fracture orientation data obtained from unoriented drill core, where borehole deviation, changing bedding attitudes, and variable lithology complicate interpretation. Drawing on studies in the Kuzbass, it describes procedures for constructing stereographic fract…
This paper characterizes the geological structure and magmatic history of the Talanovsky graben on the northwestern slope of the Kuznetsk Alatau. Using field mapping, petrographic observations, stratigraphic subdivision, and comparison with neighboring Devonian sections, the authors describe the gra…
This paper examines the poorly resolved stratigraphy and lithology of Quaternary deposits in the western Kuznetsk Basin, with emphasis on the Prisalaire belt. Using borehole sections and analyses of grain size, mineral composition, carbonate and humus content, pH, exchange capacity, salts, ostracods…
This paper presents preliminary hydrodynamic characterization of productive reservoir B2 in the Ust-Balyk oil field of Western Siberia, using pressure buildup observations from several flowing wells during trial operation. It applies Chekalyuk’s integral method and a simplified variant based on univ…
This paper examines magnesian metasomatites developed in the apical endocontact zone of the Solton granodiorite intrusion in the Kommunar gold ore field, Khakassia. On the basis of field relations, petrographic descriptions, mineral optical data, and chemical mass balance calculations, it distinguis…
This paper characterizes the facies conditions of Middle and Upper Jurassic sedimentation in the Arga Range area of the western Kansk-Achinsk coal basin, using field observations, documentation from approximately 400 core-drilling wells, and prior geological studies. It discusses stratigraphic corre…
This paper evaluates whether geochemical backgrounds can be used for stratigraphic correlation and facies analysis of Middle and Upper Jurassic continental deposits in the Arga Range area of the Kansk-Achinsk Basin. Using about 200 semiquantitative spectral analyses of sandstones, clays, argillites,…
This study examines the mineral composition and stratigraphic distribution of clayey rocks in the coal-bearing Jurassic strata of the Kansk-Achinsk brown-coal basin, where such rocks form a large part of the section. About 500 samples were analyzed by electron microscopy, methylene blue staining, an…
This paper examines the composition and structure of the iron-bearing Tashtagol magmatic complex in Gornaya Shoriya, where contact-metasomatic iron deposits are closely associated with syenite outcrops. Based on petrographic investigation, geological mapping, drill-core observations, and chemical an…
This paper examines the geochemical relationship between basic rocks and syenites in the Tashtagol mine area, where syenite massifs are associated with contact metasomatic iron ore deposits. Using 180 spectral analyses, it compares the distribution of rare and dispersed elements in gabbro, gabbro po…
This study examines how the geometry and placement of hard-alloy cutters affect the performance of core bits in rotary drilling with an annular face. Laboratory cutting tests on Kuzbass sandstones and related specimens used a hydraulic setup with dynamometer and oscillographic recording to measure c…
This paper addresses the problem of selecting the economically optimal duration of a drilling run, since pulling the tool too late or too early reduces overall productivity. It proposes a simple automatic electrical device, combined with a clock mechanism, that analogizes run drilling rate to Ohm’s …
This study examines how the rake angle of carbide tipped bit cutters affects penetration depth and cutting forces during rock cutting, addressing conflicting prior views on whether rake angle significantly changes cutting resistance. Laboratory tests were carried out on fine and medium grained sands…
