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 study examines how surface-active demulsifiers alter the stability of water-in-oil petroleum emulsions stabilized by strong interfacial layers of natural “black” emulsifiers. Using an adapted rheological instrument, the authors measured the limiting two-dimensional shear stress of adsorption la…
This paper examines general properties of the superfluid model of the nucleus, focusing on how ground and two quasiparticle excited states depend on the pairing interaction constant. Using numerical calculations for a neutron system with 106 particles and comparisons with strongly deformed nuclei, i…
This note develops a stability criterion for ordinary differential equations whose linear approximation has only neutral, purely imaginary eigenvalues, after any stable component has been removed by reduction. Using separation of motions and averaging over the unperturbed almost periodic motion, it …
This study examines the formation of acetylene from methane under rapid adiabatic compression, a method intended to provide high reaction temperatures followed by fast cooling of products. Equilibrium calculations and experiments were carried out for pure methane and for methane diluted with nitroge…
This study examines the mechanism of electrical conductivity in alkali-free barium silicate glasses, where the identity of the current carriers had remained uncertain. Glasses containing 30, 40, and 50 mol.% BaO were prepared, their conductivity was measured over 350 to 650°C, and diffusion coeffici…
This study examines the relative electronegativity and cleavage behavior of the perfluorovinyl radical in organometallic compounds, using acid decomposition of organomercury derivatives as a probe of electrophilic reactivity. Kinetic measurements for reactions with hydrogen chloride in aqueous tetra…
This study determines the saturated vapor pressures of rhenium disulfide, rhenium dioxide, and rhenium trioxide, data needed for evaluating rhenium behavior during pyrometallurgical processing of sulfide materials. Prepared compounds were examined by the Knudsen effusion method under high vacuum, wi…
This paper reports the preparation of tri-p-aminotriphenyloxonium salts by reduction of tri-p-nitrotriphenyloxonium borofluoride and describes several derivatives, including chloride, iodide, a mercuric iodide double salt, and chloroplatinate. The authors examine the weakened basicity and diazotizat…
This study examines whether radicals formed during peroxide initiated addition of trichlorobromomethane to vinyl derivatives undergo 1,2 phenyl migration from tin, silicon, or carbon to a neighboring radical center. Trichlorobromomethane was added to vinyltriphenylstannane, vinyltriphenylsilane, and…
This paper examines how heat treatment affects the electrical properties of systems composed of highly dispersed iron and organic polymers, with emphasis on iron-polyisobutylene and comparison to iron-polyethylene. Measurements of specific resistance, temperature dependence of conductivity, and ther…
This paper examines the variation of Si-O interatomic distances in silicates, challenging the common assumption that these bonds have a nearly constant length of about 1.60 Å. Using published X-ray structural data and a bonding argument based on ionic character and donor-acceptor pπ-dπ interactions,…
The paper presents an example showing non-uniqueness of generalized solutions for a Cauchy problem for a quasilinear hyperbolic system of two equations. Using a vanishing viscosity formulation with identical viscous terms, it analyzes stationary profiles associated with trajectories of the gradient …
This paper addresses the integration of steady sea-current equations in multiply connected domains, where boundary components introduce unknown constants in the total-transport stream function. For Ekman currents in a homogeneous sea, the author reformulates the problem as an elliptic equation for t…
This paper reports the isolation and chemical characterization of cardiac glycosides from wormseed wallflower, with particular attention to a newly identified compound designated glycoside I. Alcohol extraction, chromatographic separation, physicochemical analysis, enzymatic and acid hydrolysis, pap…
The study examines the inhibitory effect of uranyl ions on the radiation-chemical oxidation of ferrous iron in deaerated sulfuric acid solutions exposed to cobalt-60 gamma radiation. Initial ferric ion yields were measured as functions of uranyl ion concentration, hydrogen ion concentration, and fer…
The paper presents a numerical method for constructing characteristic equations for one-dimensional eigenvalue boundary-value problems by repeated integration and replacement of the resulting multiple integrals with finite sums based on Lagrange interpolation coefficients. It compares several quadra…
The paper studies boundary value problems for second order elliptic equations whose coefficients degenerate strongly on a boundary segment, focusing on formulations that allow singular behavior at the degenerate boundary. Using weighted variational methods and trace characterizations, it proves exis…
This paper investigates ammonolysis of the dinuclear aromatic dihalide 1,1-di-(chlorophenyl)ethane as a direct route to 1,1-di-(aminophenyl)ethane, an aromatic diamine otherwise prepared through nitration and reduction of diphenylalkanes. The authors carried out reactions in a rotating autoclave wit…
This paper studies perfect bicompact extensions of completely regular spaces, defined by a boundary preservation condition for open subsets, and gives several equivalent characterizations in terms of proximity, splitting by remainders, behavior of disjoint open sets, and monotone maps from the Čech …
This paper studies locally topologically complete spaces, defined as completely regular spaces in which each point lies in an open Čech complete subspace. It shows that paracompact locally complete spaces are complete, that every locally complete space contains a dense open complete subspace, and th…
This paper examines how Brownian motion should be described near the critical point, where diffusion coefficients fall sharply and concentration or density fluctuations become long lived. Using one dimensional random walk models and a modification of the Smoluchowski integral equation, the authors a…
This paper studies probability distributions on the space of generalized Borel measures on a compact Hausdorff space, endowed with the weak topology, with particular attention to distributions concentrated on the cone of nonnegative measures. It gives necessary and sufficient conditions for a functi…
This paper investigates the polymerization of nitriles through the carbon nitrogen triple bond, a process considered thermodynamically unfavorable under ordinary liquid-state conditions. The authors apply a principle of preliminary ordering by forming crystalline complexes of nitriles with coordinat…
This study examines how trace oxygen and water in hydrogen affect the performance of an industrial tungsten sulfide catalyst in benzene hydrogenation and cyclohexane isomerization under pressure. Using a flow apparatus, the authors compared reactions carried out with untreated technical electrolytic…
This paper analyzes the motion of spherical liquid and solid particles in electrolyte solutions subjected to mutually perpendicular electric and magnetic fields. Using viscous hydrodynamic equations with electromagnetic volume forces and appropriate boundary conditions, the authors derive expression…
This note studies a class of unbounded linear operators in a Banach space whose range, finite-dimensional null space, and bounded inverse on a chosen complement satisfy specified analytic estimates. It constructs an operator-adapted basis and associated series, proves convergence and uniqueness resu…
This paper reports the synthesis of complex fluorides of molybdenum, tungsten, and uranium hexafluorides with cesium and ammonium fluorides, formulated as MMeF7. The authors used reactions in chlorine trifluoride solution for cesium salts and a modified low-temperature addition procedure for ammoniu…
The study examines the kinetics of caprolactam hydrolysis in aqueous potassium hydroxide solutions, with emphasis on how catalytic activity changes in concentrated alkali media. Using ultraviolet spectrophotometry, the authors measured monomolecular rate constants over a range of KOH concentrations …
The paper studies homogeneous boundary value problems arising from separation of variables for equations involving two second order constant coefficient differential operators on an ellipsoidal domain. It considers a variant of a known polynomial eigenfunction problem in which the boundary operator …
This note studies zeros and extremal properties of real entire functions of exponential type, especially functions bounded on the real axis and related comparison families. It establishes estimates for canonical products obtained by perturbing the zeros of sine, proves stability results for function…
This study applies an interferometric thinning method, previously used for free liquid films, to wetting films formed on a mercury substrate, with the aim of determining disjoining pressure in thin liquid layers. After testing several liquids, benzene was selected because the mercury surface retaine…
The paper investigates the thermochemistry of the reaction between hexaethyldistannane and benzoyl peroxide, which forms triethyltin benzoate, with the aim of testing whether the process follows the proposed stoichiometric equation without side reactions. The authors determined the heat effect direc…
The paper analyzes small axisymmetric motions of an ideal incompressible fluid initially rotating as a rigid body, using linearized equations in cylindrical coordinates and a stream-function formulation. It shows that separable solutions reduce, depending on the temporal parameter, to boundary-value…
The paper studies the two-point boundary value problem for the nonlinear second-order equation y'' = F(x,y,y') under continuity, uniqueness, and continuous dependence assumptions. It proves extension theorems showing that solvability on intervals of length at most d can, under suitable matching and …
This paper examines the role of gas bubbles in shock ignition of liquid explosives, emphasizing that bubble collapse is an inertial process and cannot be adequately described by simple adiabatic compression to the external shock pressure. Experiments are described in which shock waves in water compr…
This study examines electrochemical separation of hydrogen isotopes, specifically tritium and protium, on palladium cathodes, with emphasis on how the state of surface hydrogen affects the separation coefficient. The authors combine simultaneous measurements of isotope separation with oscillographic…
This note proposes a precise formulation of homotopic duality, addressing limitations of the Eckmann and Hilton approach in which dual objects and theorems were often identified only intuitively. The paper defines duality at the level of covariant functors on pointed Hausdorff spaces, using spaces o…
This paper formulates a general operator model for transporting mass through directed road networks in which transfers along edges incur losses, and studies optimal sequences of transfers that bring vertex loads from an initial state to prescribed terminal lower bounds. For special networks with lin…
This paper applies the information entropy of a random variable to probability distributions of arbitrary dynamical variables in quantum systems, treating entropy as a measure of uncertainty in the possible measured values of an observable. The authors discuss general features of continuous and disc…
This study examines how the mechanical wear resistance of crystalline polymers depends on supramolecular structure rather than only on the conventional degree of crystallinity. Using industrial polyamide resin 68, injection molded specimens were heat treated at 150 and 190°C for varying times, then …
This paper compares laminar and turbulent burning velocities of methane, propane, and butane air mixtures with known high-temperature self-ignition delays as functions of mixture composition. Using constant-volume bomb measurements and photographic flame recording, the authors show that methane and …
This paper investigates the catalytic vapor phase transformation of tertiary N,N-dialkylcyclohexylamines, focusing on N,N-dimethylcyclohexylamine and N,N-diethylcyclohexylamine, for which ordinary ketimine formation is not expected. Experiments were conducted at atmospheric pressure over a Cu-Al2O3 …
This paper investigates 2-phenyl-4,5,6,7-tetrahydroindan-1,3-dione as an analogue of indan-1,3-dione in the context of structure, reactivity, and tautomerism in cyclic beta-diketone systems. The compound was synthesized by condensation of tetrahydrophthalic anhydride with phenylacetic acid to form t…
This paper reports a method for synthesizing branched diacetylenic organosilicon hydrocarbons as a continuation of studies on unsaturated organosilicon compounds. Halogen derivatives of organosilicon acetylenic alcohols were prepared by treatment with hydrogen chloride and then reacted with magnesiu…
The paper studies nonlinear boundary-value problems for a Maxwell-type elastic body with stress relaxation, where the relaxation time may depend on position, time, and the stress tensor. Three types of boundary conditions are treated, prescribed displacements, prescribed surface forces, and mixed co…
The paper studies existence for mixed initial boundary value problems for nonlinear second order parabolic equations in a bounded domain, with either Dirichlet or oblique boundary conditions. The problem is reformulated as an ordinary differential equation in an \(L_p\) space with an elliptic operat…
The study examines reactions of rhenium hexafluoride with alkali metal fluorides in molten rhenium hexafluoride and in chlorine trifluoride solution, using autoclave synthesis and subsequent chemical, thermal, X-ray, solubility, and magnetic characterization. Except for lithium fluoride, the alkali …
The paper studies the first boundary-value problem for a quasilinear parabolic equation in noncylindrical domains over an arbitrary time interval. Under parabolicity, Hölder regularity, boundary smoothness, and structural assumptions on the lower-order terms and nonlinear right-hand side, the author…
The paper develops a theoretical treatment of how complex formation affects the separation of chemically analogous elements by cocrystallization when both the microelement and macroelement form complexes. Starting from Khlopin’s distribution law and the Doerner-Hoskins equation, the authors derive e…
