SovietRxiv · Open Access in English
Rediscovering the Soviet scientific archive, in English
25456 full-text translations 14926 English PDFs 22540 abstracts
Showing 50 of 25456 papers
This paper investigates homogeneous catalytic systems for diene polymerization based on dialkylaluminum chlorides combined with soluble cobalt and nickel compounds. Experiments on butadiene polymerization in benzene show that cobalt chloride complexes with pyridine or ethanol are highly active at lo…
This note studies the expansion of an externally irradiated gas cloud in the isothermal approximation, neglecting self-gravitation and magnetic fields. Using a self-similar ansatz for one-dimensional plane, cylindrical, and spherical symmetry, it derives an exact form in which the density is Gaussia…
This note extends the spectral theory of stationary random processes to homogeneous random fields on noncommutative groups and homogeneous spaces. Using the representation theory of separable locally compact groups of type I, it formulates analogues of Bochner’s theorem in which continuous positive-…
This study examines the mechanism by which chloride ions activate passive chromium-containing steels, focusing on whether the process is better explained by film disruption or by adsorption. Using chlorine-36 as a radioactive tracer, the authors measured chloride adsorption on high-surface-area pres…
This paper examines how changes in the Earth’s polar compression may generate stresses in a spherical crustal layer and contribute to the formation of planetary deep faults. Using an axisymmetric elastic model with a stress-free outer surface and prescribed displacements at the inner boundary, the a…
This study examines the alkylation of 4-fluoroanisole with propylene, pseudobutylene, and cyclohexene using boron trifluoride, boron trifluoride orthophosphoric acid complex, and boron trifluoride etherate as catalysts. The reactions gave mainly 2-alkyl-4-fluoroanisoles together with 2,6-dialkyl-4-f…
The paper studies a Poincaré boundary value problem for analytic functions in the unit disk, involving the real part of a linear expression in the function and its derivative on the boundary. Under the assumption that a transformed coefficient has only finitely many negative Fourier terms, the probl…
The paper studies the problem of extending a polynomial by adding higher degree terms so that all roots of the resulting polynomial lie on the unit circle. Using Newton’s formulas, the problem is reduced to representing the first power sums of inverse roots by points of modulus one, and a constructi…
This paper reports qualitative observations on luminescent effects in electrets made from copper-activated electroluminescent ZnS dispersed in a polyvinyl butyral binder and polarized in strong electric fields. The study describes three effects associated with the electret state: enhanced luminescen…
This preliminary study examines the capacitance of the electric double layer at liquid metal electrodes in molten chloride salts, a system for which little structural information was previously available. Capacitance and resistance were measured for metals including lead and cadmium in an equimolar …
This note studies rigidity under continuous bendings for surfaces of positive Gaussian curvature with boundary, using the Gauss, Peterson, Codazzi equations in isothermal coordinates and the associated function determined by the second fundamental form. By deriving a uniformly elliptic equation for …
The paper extends a theorem of N. M. Korobov on completely uniformly distributed sequences and normal digit sequences. It proves that, for a completely uniformly distributed sequence of real numbers, the two digit sequences obtained by taking the first base \(q_1\) digit and then the first base \(q_…
The study investigates the decay of Ho-156 in order to refine transition energies, determine conversion characteristics and multipolarities, and construct a level scheme for Dy-156. Ho-156 was produced by high energy proton irradiation of tantalum, chemically separated, and examined with a double fo…
This study examines tritium kinetic isotope effects in liquid-phase hydrogen abstraction from hydrocarbons by free methyl radicals, focusing on benzene and toluene and comparing the results with earlier data for aliphatic and alicyclic hydrocarbons. Methyl radicals were generated by acetyl peroxide …
This paper establishes sharp Bernstein and Markov type estimates for the derivative of a trigonometric polynomial of order n bounded by one on an interval shorter than its period. The argument introduces explicit extremal trigonometric polynomials defined through a change of variables to algebraic p…
This study examines the electronic effects of fluorine-containing substituents in aromatic compounds, a class for which physicochemical data were largely unavailable beyond fluoro and trifluoromethyl derivatives. The authors measured the acid dissociation constants of newly synthesized substituted b…
This paper examines the relationship between electrical conductivity and electron magnetic resonance spectra in organic substances and polymers containing conjugated bonds. Using previously measured conductivity parameters and resonance observations for a series of such materials, the authors compar…
The study examines phase equilibria in the ternary system magnesium sulfate, nickel sulfate, and water, focusing on hydrate crystallization over a range of temperatures. Using isothermal evaporation and crystallization experiments, with chemical analysis, Schreinemakers’ residue method, optical cont…
This paper examines the thermodynamic equilibrium of isomerization between 1-bromopropane and 2-bromopropane, motivated by uncertainties in earlier equilibrium data and by the relative roles of kinetic and thermodynamic factors in alkyl halide formation. The study measured equilibrium from both dire…
This paper reports an experimental test of a hypothesis that magnetic declination is partly produced by electric currents in the ocean, with an additional contribution from ionospheric currents associated with the distribution of continents and oceans. Measurements were made in the tropical Atlantic…
This paper reports syntheses of indane-series hydrocarbons bearing side chains in the five-membered ring, the benzene ring, or both rings. The authors use condensation of indene with ketones followed by hydrogenation to prepare 1-substituted indanes, and sulfuric acid catalyzed alkylation of indane …
This note studies how the smoothness of boundary data for the planar Dirichlet problem determines the differential properties of the corresponding harmonic function in domains whose boundaries are piecewise smooth and have nondegenerate angles. Using Nikol’skii type function classes, it establishes …
This paper reports the synthesis of a lead-containing methacrylate, diphenylplumbylene dimethacrylate, through reactions of diphenylplumbanone and triphenylplumbanol with methacrylic acid. The study shows that triphenylplumbanol does not give the expected triphenylplumbyl methacrylate, but instead u…
The paper studies bounded regular functions on the complement of a closed subset of the extended complex plane through a duality framework involving analytic functions on the closed set and measures supported in the complement. It introduces a seminorm defined by minimal total variation of measures …
This note studies the flexibility and rigidity of general convex surfaces homeomorphic to an open disk, bounded by a simple closed curve, within the class of all convex surfaces. Using Alexandrov’s gluing theorem and Pogorelov’s uniqueness theorem, the problem is reduced to the existence of nontrivi…
This paper studies ordinary linear differential equations with small coefficients multiplying the highest derivatives near an irregular singular point of first rank at infinity. It constructs normal formal solutions associated with the roots of the characteristic equation, distinguishes those that h…
This study examines how concentration fluctuations affect the effective dielectric permittivity of binary solutions with critical regions of phase separation. Dielectric permittivity, density, and refractive index were measured for nitrobenzene solutions in cyclohexane, n-hexane, n-heptane, and n-oc…
This note studies weighted polynomial approximation of analytic functions in unbounded domains, building on earlier completeness results for angular regions. For functions analytic in the upper half-plane with prescribed growth bound M(r), it proves an estimate for the best weighted polynomial appro…
The study examines reactions of diborane with n-propyl and n-butyl mercaptans in ether solution and characterizes the resulting alkylmercaptodiboranes. Excess mercaptan gives stable tetraalkylmercaptodiboranes, while a 1:2 diborane to n-butyl mercaptan ratio affords unstable di-n-butylmercaptodibora…
This study examines whether hydration of hemihydrate gypsum suspensions ends before, after, or at the same time as the attainment of maximum crystallization structure strength. Using conical plastometry to follow structure formation and adiabatic calorimetry to follow hydration, the authors compare …
This study determines thermodynamic functions for lower tungsten oxides by an independent high-temperature electromotive-force method, addressing limitations of earlier hydrogen reduction equilibrium measurements. Cells containing tungsten oxide mixtures, a zirconia-calcia solid electrolyte, and an …
This study examines how the specific radioactivity of cerium(III) oxalate labeled with cerium-144 affects its measured solubility in water, a question relevant to the use of radioactive tracers for sparingly soluble compounds. Cerium oxalate preparations of identical composition but different activi…
This paper studies p-groups that can be decomposed as semidirect products of cyclic subgroups, equivalently groups with an invariant series of cyclic factors complemented in the group. It derives structural conditions on the defining conjugation relations, describes commutator subgroups and lower ce…
This paper introduces the notion of a normal scale of Banach spaces, replacing the analyticity condition used in earlier analytic scales by logarithmic convexity of norms with respect to the parameter. It gives basic structural properties of such scales, discusses admissible renormings and completio…
This study examines how ions of variable-valence metals affect the corrosion of quenched 1Kh18N9T stainless steel in boiling concentrated nitric acid. Metal ions were introduced into 12 to 16 N nitric acid solutions as nitrate salts or dichromate, and corrosion rates, electrode potentials, and catho…
This study examines the concentration and isotopic composition of lead in representative iron meteorites, including octahedrites, hexahedrites, ataxites, and troilite inclusions. Using chemical isolation and mass spectrometric measurements, the authors analyzed metallic phases from 12 meteorites and…
The paper develops an approximate kinetic treatment of hot hydrogen atoms formed during radiolysis of alkanes and examines how their thermalization can affect the yield of dimer products. Using an energy group method analogous to neutron slowing down theory, it formulates diffusion and reaction equa…
This study compares the radiolysis of aqueous solutions under 660 MeV proton irradiation with that produced by cobalt-60 gamma radiation, using systems in which the proton energy loss per unit path length is close to that of fast electrons. Proton flux and absorbed dose were determined mainly by gra…
This paper addresses the isolation of weighable quantities of pure protactinium-231 from uranium-production wastes, where its very low concentration and association with chemically similar elements complicate purification. The authors concentrate protactinium by sorption from nitric acid solutions o…
This paper examines the behavior of amides of 8-[dibenzoylenepyridyl]naphthoic acid prepared from the corresponding acid chloride with ammonia and amines. The authors compare primary, secondary, acylated, oxime, and reduced derivatives using color changes, isolation of a sodium salt, elemental analy…
The study examines the initial stage of the reaction of phosphorus pentachloride with vinyl and isopropenyl acetates, seeking conditions under which addition to the unsaturated ester can be isolated or converted before further transformation. Low temperature reactions using two equivalents of phosph…
This paper investigates the isomerization and deuterium exchange of naphthenic hydrocarbons in liquid hydrogen bromide enriched with deuterium, using aluminum and gallium bromides as catalysts. Kinetic measurements for cyclopentane, methylcyclopentane, cyclohexane, and methylcyclohexane show that me…
This note studies global well-posedness for constant-coefficient differential equations, or polynomial systems, of the form p(i∂/∂x)u = w, under the assumption that the polynomial has no zeros on the real manifold. It introduces the genus of the equation, defined through zero-free complex tubular do…
This paper constructs an external radical for automorphism groups of groups satisfying the maximal condition, modeled on the radical of an endomorphism ring. Using commutator series, nilautomorphisms, and passage to the holomorph, it proves criteria for external nilpotence, shows that the radical co…
This paper addresses Ponomarev’s question on whether a monotone mapping between spaces can be extended to a monotone mapping between bicompact extensions. It proves that if a monotone mapping from a completely regular space onto a normal space is open or closed, then any extension to a bicompactific…
This note addresses the relationship between three topological dimensions, covering dimension, small inductive dimension, and large inductive dimension, for locally bicompact groups. Building on paracompactness and known local product structure, it first reduces the equality of covering and small in…
The study examines the kinetics of uranium trioxide reduction by hydrogen at 350 to 500 °C and hydrogen pressures of 50 to 400 mm Hg, using a high-vacuum apparatus with continuous gravimetric monitoring. The authors find that the initial reduction stage proceeds at a constant rate proportional to th…
The paper investigates the kinetics of homogeneous destructive hydrogenation of toluene and ortho-cresol under high pressure in a flow reactor, addressing discrepancies between earlier bimolecular and simplified radical-chain kinetic descriptions. Experiments were carried out at 530 degrees for tolu…
This study examines cis-trans isomerization of natural rubber in benzene solution under the action of dry hydrogen chloride and ethylaluminum dichloride. The authors determined unsaturation, chlorine content, and chain microstructure, using infrared absorption bands to estimate the relative amounts …
This paper proposes synchrotron radiation from relativistic electrons in nebular magnetic fields as an explanation for the luminosity, morphology, variability, spectra, and polarization of cometary nebulae. It argues that electrons ejected from magnetic polar regions of the central star can radiate …
