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 applies electron paramagnetic resonance to glasses in the ternary vanadium oxide, phosphorus oxide, and tungsten oxide system in order to clarify how mixed transition metal oxides affect electrical conduction. EPR spectra were compared with static magnetic susceptibility, electrical condu…
This paper estimates the relative concentration of negative ions in the ionospheric D region, where rocket measurements of ion concentrations had shown large discrepancies. Using the effective recombination coefficient profile and its relation to dissociative recombination and mutual neutralization,…
This study examines the hyperfine structure of the electron paramagnetic resonance line with g approximately 4.3 for Mn2+ impurities in chalcogenide glasses based on Tl, As, and S, Se, or Te. EPR measurements at room temperature, 77 K, and 4.2 K show that the line is a superposition of six hyperfine…
This paper studies verbal subgroups of normal subgroups in nonabelian free groups and proves a general cancellation property for varieties of groups. It shows that if, for a group variety distinct from the variety of all groups, the inclusion of verbal subgroups V(R) contains V(S) holds for normal s…
This note solves the isomorphism problem for group algebras of countable abelian p-groups over fields, distinguishing the cases in which the field has characteristic p and characteristic different from p. It proves that in characteristic p the group algebra determines the countable abelian p-group, …
This paper examines holographic image reconstruction when a hologram is recorded without a separate reference beam. Treating the object first as a discrete set of coherently radiating points and then as a continuous brightness distribution, the authors show that plane-wave reconstruction yields an i…
This note gives new examples of fields and classes of fields of finite characteristic whose elementary theories are decidable. It first characterizes elementary equivalence of separably closed fields of characteristic p by the invariant measuring the degree of imperfection, using model completeness …
The paper studies uniqueness classes for the Cauchy problem for linear partial differential equations in one spatial variable with variable lower-order coefficients and constant leading coefficient, extending earlier results for constant-coefficient systems. It gives conditions, often necessary and …
This paper studies systems of singular integro-differential equations on compact smooth manifolds whose principal symbol is not elliptic but has constant rank deficiencies that can be resolved through successive compatibility relations. It defines a class of uniformly nonelliptic systems by iterativ…
This note studies dimension-theoretic properties of closed finite-to-one mappings between paracompact spaces, extending Hurewicz’s dimension-raising theorem. It introduces sheaf-theoretic tools, including partial inductive systems of sheaves and a spectral sequence associated with a closed finite-to…
This note studies unitary extensions, without exit from the given space, of an isometric shift operator with defect indices 1,1 in a finite-dimensional Pontryagin space, focusing on the case with one negative or positive square. Using the associated nondegenerate Toeplitz Gram form, it gives an expl…
The results published previously (Doklady Akademii Nauk SSSR, 167, No. 5, pp. 1004–1007) are presented in detail. Bibliography: 20 items.
This work is related to the papers $[1,2,3]$. The problem of finding periodic generalized solutions for nonlinear generalized systems of differential equations of the type $$\dot{\mu}=A(t)\mu+P(\mu,t)+\eta$$ is formulated and solved. Here $A(t)$ is a $n\times n$ matrix with infinitely differentiable…
This article examines the Marxist political-economic claim that modern science is being transformed into a direct productive force of society. It analyzes science as a social institution, a system of knowledge, and a specialized sphere of labor, then considers how its relation to production is media…
This article examines the territorial location and sectoral development of higher education in Siberia in relation to the region’s postwar economic expansion and its shortage of highly qualified personnel. Using statistical data, party and archival materials, it traces the rapid growth of Siberian h…
This article examines the organization of student scientific research work in Soviet technical higher education, using Tomsk Polytechnic Institute as its main case. Drawing on institutional experience, materials from departmental discussions and conferences, and a questionnaire survey of 602 senior …
This article examines the effectiveness of training engineering personnel in the USSR, with particular attention to Siberia and the balance among full-time, evening, and correspondence higher education. Using statistical data, regional examples, and survey evidence, the authors argue that Siberian i…
This paper studies forced processes in discrete pulsed automatic control systems with finitely many degrees of freedom and a single nonlinear block, represented by nonlinear difference equations with a stable linear part and sector-type restrictions on the nonlinearity. It formulates frequency-domai…
This paper evaluates a brushless electric-machine amplifier with adjustable frequency, BEMA-AF-12A, as a source for frequency control of squirrel-cage asynchronous motors in automated electric drives. It describes the machine and semiconductor commutator arrangement, then compares its technical and …
This paper evaluates the BEMU-PCh-25A, a 2.5 kW brushless electric-machine amplifier with a 200 Hz alternating-current output, developed for non-reversing automatic-control circuits and high-speed drive applications. Using comparative techno-economic indicators, the authors assess the new design aga…
The paper addresses calculation of leakage inductance and short-circuit reactance in transformers with concentric windings of unequal height whose height midpoints lie in a common plane. It argues that direct averaging of winding heights is not theoretically justified and develops a generalization o…
This paper examines the nonlinear electrical parameters of small direct current machines used in automatic control systems, where armature reaction, brush displacement, saturation, and mutual induction can make simple linear models inadequate. Using stationary-machine transient tests and low-frequen…
This paper presents a refined calculation of commutation and commutation stability in a low-power DC machine using experimentally obtained families of natural current-voltage characteristics for EG-4E brush contacts under anode and cathode polarization. The authors solve the commutation differential…
This paper analyzes the radial dynamics of sliding brush and commutator contact in electrical machines, especially under high-frequency intermittent disturbances caused by protruding commutator segments. It develops a mechanical model of the brush assembly that includes brush mass, spring stiffness,…
This paper analyzes a brushless variable-frequency AC electromechanical amplifier as a two-stage electric machine with combined magnetic circuits. Using Lagrange-Maxwell equations under sinusoidal mutual-inductance and fundamental-current assumptions, it derives steady-state voltage equations and tr…
This paper analyzes the static accuracy of a pulsed automatic control system for charging a capacitive energy storage unit from an ion converter. Starting from linearized equilibrium equations for the rectifier, storage capacitor, and grid control device, the authors derive expressions for current d…
This paper examines the thermal behavior of end commutators in direct-current electric machines, focusing on whether increased brush current density compromises cooling and reliability. Using comparative experiments on traction motors, auxiliary generators, and separately mounted short-circuited com…
This paper develops structural block diagrams for a transverse-field electromechanical amplifier operating with an active-inductive load, a configuration typical when the amplifier feeds field windings of direct-current machines. Starting from differential equations for transient processes, it formu…
This paper examines how the stiffness of structural elements affects vibration and airborne noise in a single-armature electric converter tested in four design versions. It identifies principal excitation frequencies from magnetic, mechanical, aerodynamic, brush-commutator, and bearing sources, then…
This paper examines how load affects the magnetic vibration and airborne noise of low-power DC electrical machines, motivated by the inadequacy of no-load measurements for predicting rated-load vibroacoustic behavior. The authors designed a vibration- and noise-isolated loading device and measured v…
This paper applies the theory of thermal similarity to the heating of armature windings in enclosed non-ventilated direct-current machines. It reformulates temperature-distribution equations for slot and end-winding regions in terms of dimensionless complexes, then uses computer calculations over pr…
This paper develops a simplified analytical method for estimating the temperature level and longitudinal temperature distribution in the armature winding of enclosed non-ventilated DC machines. Treating the winding as a constant-section rod divided into slot, end, and bandaged end-connection regions…
A method is developed for calculating the steady-state temperature distribution along the armature winding of enclosed non-ventilated DC machines, where the armature winding typically carries the highest thermal load. The winding is represented over one tooth pitch as a set of connected sections, in…
This paper examines how the main pole field affects commutation in a direct-current machine with auxiliary valve-brush commutation, especially in machines with skewed slots where the main-field emf in the commutation zone cannot be neglected. Using a simplified analytical model, the authors derive e…
This paper develops a calculation method for the sparkless operating zone of a direct current motor using brush and auxiliary valve commutation. The analysis determines limiting commutating electromotive forces from brush geometry, commutation intervals, leakage and mutual inductance, and, in a late…
The paper proposes a circuit for commutating current from a shock generator that reduces the required power rating of auxiliary valves. It analyzes a switching arrangement using a high-speed contact apparatus, a saturation reactor, and a single controlled auxiliary valve, describing the timing of va…
This paper examines sparkless switching devices for commutating large pulse currents in high-power electrical laboratories and in circuits such as accelerator magnet supplies and oscillatory LC systems. The authors describe a fast contact apparatus with an electrodynamic drive, oil damping, a satura…
This paper examines temperature fields and thermal loading in enclosed fan-cooled low-power asynchronous motors, using AO2-series machines of several frame sizes and pole numbers. The authors embedded numerous thermocouples in stator windings and frames, repeated rated-load and overload tests, and a…
The paper examines transverse-field electric machine amplifiers with smooth armatures, focusing on how longitudinal biasing affects self-excitation, amplification, dynamic response, and permissible armature current density. Three experimental models are tested to determine self-excitation thresholds…
This paper examines a commutatorless reversible AC electric machine amplifier intended as an alternative to commutator amplifier and DC motor systems in automation applications. The authors describe the operating principle of a three-stage two-phase amplifier with increased, unregulated output frequ…
This paper examines commutation in an EMA-12A transverse-field electric-machine amplifier operating on direct current, with attention to brush overlap and compensation of armature reaction along the longitudinal axis. Experimental oscillograms of commutating section currents are compared with calcul…
This paper examines failures of turn-to-turn insulation in random-wound stator windings of induction motors, arguing that low-voltage shop tests detect mainly metallic shorts and miss hidden defects responsible for many early failures. It proposes a high-frequency induced-voltage testing method usin…
The paper examines how emergency operating modes and protective disconnection affect the operational reliability of induction motors, with attention to two-phase and three-phase short circuits. Using plant observations, the authors model accident flows with a Poisson distribution, fit protection tri…
This paper proposes a method for calculating permissible regions of control-test parameters for three-phase asynchronous electric motors as an alternative to labor-intensive procedures requiring type-test results. The approach uses linear relationships between deviations of input, output, and contro…
