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 solid solutions between tricalcium silicate, a principal cement mineral, and lanthanum oxyorthosilicate as a means of identifying crystal-chemical features of tricalcium silicate. Samples containing 1 to 25 wt.% lanthanum oxyorthosilicate were synthesized and studied by crystallo…
This study examines how electronic structure affects the rate of hydrogen-deuterium exchange in methyl groups of nitrogen heterocycles and their N-oxides. Rate constants, activation parameters, NMR chemical shifts, kinetic isotope effects, and simple LCAO molecular-orbital calculations were compared…
This paper reports electrical and magnetic effects produced by passing current through pressed polycrystalline tablets of triphenylmethane dyes, studied mainly for brilliant green and extended to related dyes. Using conductivity measurements, charge and discharge observations, and electron paramagne…
This paper investigates electrophilic substitution reactions of 1,2-dihydropyrrolizine and several homologs, a bicyclic heterocyclic system previously little studied. The authors introduce formyl, acetyl, oxymethyl, and N-disubstituted aminomethyl groups using dimethylformamide with phosphorus oxych…
This study examines the interaction of cerium molybdenum heteropoly compounds with trivalent rare earth ions from the cerium and yttrium groups. Using chemical analysis, amperometric titration, absorption spectroscopy, pH measurements, and electromigration with labeled cerium, the authors show that …
This paper studies the inclined derivative problem for bounded solutions of the Poisson equation in a smooth plane domain when the boundary vector field is tangent at finitely many singular points. Using Freidlin’s construction, it relates the boundary value problem to a reflected Brownian motion st…
This paper studies tensor fields on compact homogeneous spaces that admit spherical models, extending earlier decompositions for tensor fields on spheres. It describes a general construction in which irreducible tensor spaces in an ambient Euclidean space are projected first to the sphere and then t…
This paper studies proper Riemannian spaces admitting a continuous group of motions whose isotropy group is reducible and decomposes with respect to two invariant orthogonal planes. Using adapted orthonormal frames, connection forms, and the invariance of the moving-frame equations under the station…
This note studies the existence of similar Fisher, Welch, Wald tests for comparing the means of two normal populations with unknown and unequal variances, allowing samples of arbitrary sizes. Using Wald’s representation of the critical region and the analytic continuation of the similarity equation …
This study examines how the precipitant and solvent system used in fractionating a methyl methacrylate, styrene copolymer affects the molecular weight distributions of the resulting fractions. Fractions obtained in two systems, differing in their sensitivity to macromolecular composition, were analy…
This paper analyzes the linear aeroelastic stability of a simply supported rectangular three-layer plate with an asymmetric thickness structure and a rigid core, subjected to in-plane normal and shear forces and exposed on one side to a supersonic gas flow. The formulation incorporates transverse sh…
The study examines the reaction pathway of simple alpha olefins with liquid dinitrogen tetroxide, with particular attention to isobutylene, for which earlier mechanisms had not been experimentally substantiated. Using specially synthesized model intermediates, infrared spectroscopy, polarography, hy…
The paper studies the limiting amplitude principle for abstract second order evolution equations in a Hilbert space and for elliptic operators in unbounded domains. It first gives sufficient spectral resolvent conditions under which the time harmonic response with zero initial data converges, or has…
This paper studies the size of defects of meromorphic functions in the plane in the sense of Nevanlinna theory, focusing on the supremum of the sum of square roots of positive deficiencies among functions of given lower order. Building on a theorem of Fuchs, the argument proves a new estimate for th…
This paper develops a local criterion for the existence of wave operators in abstract scattering theory for pairs of self-adjoint operators, defining strong and weak wave operators relative to a bounded Borel subset of the spectrum. It separates conditions ensuring weak existence, isometry, and comp…
This study examines the radiation stability of solid alkali-metal azides under cobalt-60 gamma irradiation, with attention to how crystal-lattice characteristics affect radiolysis. Sodium, potassium, rubidium, and cesium azides were irradiated and analyzed for loss of azide ion and formation of free…
This study examines the reactions of iodine chloride with several morphine-series alkaloids, including diacetylmorphine, codeine, 6-acetylcodeine, diacetyl-N-allylnormorphine, and saturated analogues, in different solvents. The authors isolate previously undescribed iodine chloride complexes or addi…
This paper examines electron heating associated with cyclotron instability in a low-pressure anisotropic plasma, especially when ion perpendicular temperature greatly exceeds longitudinal temperature. Using the longitudinal dispersion relation for a collisionless Maxwellian anisotropic plasma, the a…
The paper studies high-frequency asymptotics for the exterior Neumann problem for the Helmholtz equation describing diffraction of a cylindrical wave by a smooth finite convex cylinder, with attention to the geometrical shadow region. It proves an upper bound for the field of order k^{-1/2} exp[-c k…
This paper examines the application of the Simmons Smith cyclopropanation reaction to organosilicon unconjugated di-, tri-, and tetraenes derived from allylsilanes. Dimethyldiallylsilane, methyltriallylsilane, and tetraallylsilane were treated with methylene iodide in the presence of a zinc copper c…
This paper studies coverings of finite directed and undirected graphs by spherical neighborhoods of selected vertices, considering both vertex and edge coverage under graph metrics with positive arc or edge lengths. It proves that, for connected graphs, covering problems of this type can be reduced …
The paper studies entire functions of several complex variables of prescribed finite type that are positive on the real domain and belong to generalized Lebesgue spaces with mixed norms. It derives Nikolskii-type inequalities comparing mixed norms with different exponent vectors, including sharp con…
This paper examines the ultraviolet absorption spectra of nitro, acetyl, amino, dimethylamino, and N-phenyl derivatives of thiophene in comparison with corresponding benzene derivatives, using decomposition of molecular structures into polar chromophoric systems. The authors assign observed absorpti…
This study examines the oxidative ammonolysis of methyl vinyl ketone as a route to unsaturated nitriles, especially acrylonitrile, using a continuous flow reactor with a coprecipitated alumovanadium catalyst. The authors first compare catalytic oxidation in the absence of ammonia, where acrolein and…
This paper generalizes M. Riesz’s maximal boundary theorem for Hardy class functions to functions in a domain that admit integral representations over a smooth boundary with kernels satisfying boundedness, regularity, and off-diagonal control conditions. Using ideas associated with Calderon and Zygm…
This study examines the hypereutectic region of the iron carbon system from 2.88 to 26.5 wt.% carbon, where earlier data on phases and equilibria beyond cementite were uncertain. High purity iron and graphite alloys were prepared, quenched or slowly cooled, and analyzed by microscopy, microhardness …
This paper examines why transition metals differ in their ability to refine the grain of aluminum, criticizing explanations based solely on carbide or aluminide nuclei, peritectic reactions, or lattice matching. Experiments on AB000 aluminum with fourteen transition metals from periods 4, 5, and 6 m…
This paper examines the reaction of triethylgermane with diacetylenic and germanium-containing vinylacetylenic glycols in the presence of chloroplatinic acid catalyst, comparing its behavior with analogous silicon compounds. The authors show that catalyst amount strongly affects the course of hydrog…
The paper examines why the vibrational frequency conventionally assigned to the nitrile C≡N stretching mode increases when nitriles coordinate or adsorb through the nitrogen atom. Using a simplified linear CH3CNM model with acetonitrile force constants held fixed, the authors calculate vibrational f…
This paper develops a special class of semi-Riemannian spaces with degenerate metric structure as a geometric framework for unifying gravitation and electromagnetism. It introduces flag manifolds, flagtensors, a compatible torsion-free flag-affine connection, associated invariants of vectors and ang…
This study examines how mutual hydrogen bonding affects measured heats of adsorption for alcohols on graphitized carbon black, a problem that complicates calorimetric determinations at appreciable surface coverage. Using gas chromatography at very low coverages and elevated temperatures, the authors…
The paper studies the distribution of zeros of the Riemann zeta function and Dirichlet L-series near the line Re s = 1 by refining Linnik’s method of constructing sums that are large at zeros. Using estimates of I. M. Vinogradov, it partitions zeros of zeta up to height T into logarithmically many c…
The paper analyzes the motion of a gyroscopic compass when the vertical velocity of its support is treated as a stationary random process, as may occur under vibration or pitching. Starting from linearized gyrocompass equations with vertical base displacement, it formulates a system with random para…
This paper examines the formation and transformation of stable and metastable calcium hydroaluminates during hydration of anhydrous monocalcium aluminate, CaO·Al2O3, and tricalcium aluminate, 3CaO·Al2O3, in aqueous suspensions. Using literature analysis together with thermographic studies of hydrati…
The paper examines the relationship between the constants n and K in the topokinetic equation for solid-state reactions. Starting from an expression for K in terms of elementary rate constants and applying transition-state theory, the authors derive a linear compensation relation, log K = a - bn, un…
This paper examines the relation between geometric and strength characteristics in structure formation in disperse systems, using limiting shear stress as the main strength measure. The authors derive a generalized model connecting strength with particle contact force, particle diameter, solid-phase…
This paper revises thermodynamic and geometric relations in binary and ternary iron, carbon alloys, with emphasis on carbon isoactivity lines and the poorly accessible cementite side of the Fe, C constitution diagram. Using Darken and Gurry activity calculations and a modified Hillert method applied…
This paper examines automatic control of linear plants with time-varying parameters, focusing on cases where the plant numerator polynomial has nonzero degree and discontinuous control alone does not eliminate parameter dependence. The authors propose a variable-structure control scheme that adds a …
This paper proposes and tests a pulse chromatographic method for studying bimolecular reaction kinetics, using a chromatographic column before the reactor to purify reactants in situ and detectors before and after reaction to measure conversion and contact time. The method is applied to diene synthe…
This paper reports an experimental study of the ignition of homogeneous explosive particles in a heated gas, using spherical barium azide particles as the principal example. The authors developed vertical and horizontal heated-tube apparatuses to measure ignition delay times and critical self-igniti…
This paper establishes two embedding results for weighted Sobolev-type spaces \(L_{p,b}^{(1)}(\Omega \times R_+)\) on cylinders over a half-line. Under integrability and connectivity assumptions on the weights, it proves the existence of an asymptotic constant for functions in the space and derives …
This study examines whether block copolymers can be synthesized by mild pyrolysis of polymer mixtures through recombination of radicals formed during thermal degradation. Mixtures of nitrile rubber with epoxy resin, polyethylene with epoxy resin, and polyethylene with polyisobutylene were heated und…
Electron paramagnetic resonance was used to study dioxane solutions of copper dithizonate and diphenylcarbazonate complexes, with additional observations on nickel and palladium dithizonates. The authors report reversible changes induced by slight alkalization, acidification, dilution, or addition o…
This paper presents a numerical investigation of supersonic flow past a sphere with a detached shock wave for air and carbon dioxide under thermochemical equilibrium. The authors formulate the transformed governing equations with equilibrium thermodynamic functions, apply shock and body boundary con…
This paper studies the homogeneous Hilbert boundary value problem for a finite multiply connected planar domain and addresses its reduction to a Hilbert problem with a rational coefficient. Using harmonic measures, their conjugates on the covering surface, and solvability conditions for boundary rea…
A series of ortho-hydroxyazo dyes containing carbazole, diphenylamine, or diphenyl residues was synthesized to examine structural features of 1-arylazo-2-naphthols and related naphthoic acid derivatives. The compounds were studied by polarographic reduction at a dropping mercury electrode and by inf…
