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 structural transformations in readily crystallizing alkali-free glasses of the SiO2, Al2O3, CaO, MgO system containing varying TiO2 additions, using ultraviolet absorption spectra as a structure-sensitive probe. Differential absorption measurements were made after heat treatments…
The paper proposes an integral method for linear heat and mass transfer problems in bounded domains, assuming that the influence function for the corresponding whole-space problem is known analytically or experimentally. For convex domains with insulated fixed or moving boundaries, it derives reflec…
This study examines how strong electrostatic fields influence the stereochemical structure of polymethyl methacrylate formed by free-radical polymerization of methyl methacrylate. Polymerizations were carried out in bulk and in toluene solution using benzoyl peroxide, at field strengths of about 10,…
This study examines the extraction of individual ruthenium nitrosopentahalide complexes by long-chain aliphatic amines, focusing on how amine structure and halide acidoligand identity affect distribution into an organic phase. Radioactively labeled ammonium complexes of the type [RuNOX5]2-, with chl…
This paper presents a matrix-based method for constructing and analyzing binary cyclic error-correcting codes, using the cyclic properties of square matrices as an alternative to the usual polynomial ideal formulation. It defines check and quasi-check matrices generated by repeated application of a …
The paper proposes using an electromagnetic condenser-objective lens in a double-focusing mode to obtain microelectron diffraction patterns from selected specimen regions without relying on the conventional intermediate-lens switching method. The authors analyze how increased objective excitation fo…
The paper reports the synthesis of symmetrical 1,4-bis-(diorganovinylsilyl)-benzenes, a class of p-disilyl-substituted benzenes proposed as monomers for polymers containing alternating silylphenylene and silicon-carbon units. The compounds were prepared by an organomagnesium route from p-dibromobenz…
This paper determines repulsive interaction potentials for krypton, xenon, and their mixtures with lighter noble gases using fast neutral atom scattering data and a power law form, V(r) = K/r^s. The authors extract the parameters K and s over specified interatomic distance intervals and compare expe…
This study examines synthetic zeolites of types X, Y, and mordenite as catalysts for alkylation of aromatic hydrocarbons with olefins and alcohols under flow conditions at atmospheric pressure. Product distributions were measured chromatographically, and the effects of zeolite structure, silica to a…
This study examines the formation and reactivity of sodium and potassium salts of bis-diphenylphosphinylmethane in relation to organophosphorus olefination mechanisms. The salts were isolated in analytically pure form, prepared from the dioxide with alkali metals or alkoxide and hydride reagents, an…
This paper presents a finite difference method for two-dimensional unsteady flows of a viscous compressible heat-conducting gas with variable viscosity and thermal conductivity. The scheme is formulated for the Navier-Stokes equations in divergence form using a two-stage time update, with approximat…
This note studies asymptotic properties of polynomials orthogonal on a closed contour in the complex plane under smoothness assumptions on the contour and the weight. The method replaces the usual orthogonalization of powers by orthogonalization of generalized Faber polynomials, introducing normal m…
This study examines the interaction of uranyl dihalides with tri-n-butylphosphine oxide in order to clarify the composition, properties, and possible structures of complexes relevant to extraction chemistry. A series of fluoro, chloro, bromo, and iodo uranyl phosphine oxide complexes was synthesized…
This study examines the thermal decomposition of copper, nickel, and thorium oxalates using emanation measurements, release of radioactive gas surface labels, differential thermography, and, for selected samples, X-ray diffraction. The results associate characteristic maxima in gas release with dehy…
This note derives short-wave asymptotic formulas for selected eigenvalues and eigenfunctions of the Helmholtz equation in a smooth convex plane domain with Dirichlet or Neumann boundary conditions. Using the parabolic equation method, it identifies two classes of stable ray systems, those concentrat…
The paper studies conditioning in the Petrov-Galerkin approximation of linear operator equations between Hilbert spaces. It establishes a necessary and sufficient convergence criterion in terms of uniform boundedness of the inverses of matrices formed after orthonormalizing the trial and test system…
The paper develops a computational procedure for finding boundary solutions of finite systems of linear inequalities of closed type. Using iterative Jordan transformations, and when necessary a one phase simplex auxiliary problem with a single artificial variable, the method determines the rank of t…
The paper develops an iterative framework for solving finite-difference analogues of strongly elliptic systems by replacing the original discrete operator with a spectrally equivalent positive operator. It defines spectral equivalence estimates, analyzes Richardson-type iterations and Chebyshev para…
This paper reports experimental studies of magnetic surfaces and plasma confinement in a closed toroidal stellarator with a two-pass helical field and external plasma injection. Using a pulsed electron beam and probe diagnostics, the authors measured magnetic surface geometry, rotational transform, …
The paper studies linear Petrovskii parabolic systems whose coefficients are continuous in the spatial variables with a modulus satisfying the Dini condition. Using Hopf’s method and, under a stronger iterated Dini condition, the Levi parametrix method, it establishes correct solvability of the Cauc…
This paper reports the synthesis of heterocyclic steroid derivatives in which pyrylium and pyridine rings are condensed with a 17-methyldihydrotestosterone framework. The authors condense 2-oxymethylene-17-alpha-methyldihydrotestosterone with several methyl ketones in acetic acid in the presence of …
This paper proposes a quantitative framework for relating present-day tectonic mass flow to seismicity and to displacement measurements obtained by geophysical, geodetic, geological, and geomorphological methods. Treating large-scale rock motion as the flow of an incompressible Newtonian medium, it …
The paper studies the long-time behavior of solutions to a nonstationary exterior boundary-value problem for the equation involving the polyharmonic operator with time-harmonic forcing. It establishes existence, uniqueness, smoothness, boundedness, and spatial decay estimates for generalized solutio…
This paper examines how the wind coefficient for purely wind-driven ice drift in the Arctic Basin depends on wind speed and ice thickness. Starting from earlier expressions for ice-drift velocity, it derives relations linking the wind coefficient to the ratio of ice thickness to wind speed, using a …
This study examines alcohol formation during the photochemical chlorine-initiated oxidation of propane at relatively low temperatures, focusing on the relationship between alcohols and aldehydes predicted by peroxy radical reaction schemes. Using chromatographic analysis of alcohols and polarographi…
This study examines how chromium and nickel salts affect hydrogen sorption by palladium black and its catalytic activity in the hydrogenation of acetonitrile and dimethylacetylenylcarbinol. Using charging curves at 20 degrees, the authors compare acidic and aqueous salt solutions and relate changes …
This paper analyzes induced radiation generation in a laser crystal moving along the axis of a resonator, motivated by spatial inhomogeneities of inverse population that arise in standing wave modes and are not readily removed by diffusion. Using kinetic equations for inverse population and photon n…
This paper reports the first synthesis of alpha-nitrosohexafluoroisobutyric acid derivatives containing carboxyl-related functional groups in the alpha position to the nitroso group. The acid fluoride was prepared by addition of nitrosyl fluoride to perfluoromethacrylic acid fluoride, and careful al…
The paper presents an experimental method for studying desorption of surface-active substances from liquid phase boundaries under static conditions, using surface-tension measurements from the contour of a sessile bubble or drop. The method replaces the solution surrounding an undisturbed bubble wit…
This paper examines gas to gas phase separation in binary mixtures using a statistical method based on conditional distribution functions and molecular interaction integrals. It formulates a phase transition condition for compressed gases and applies it to mixtures described with Lennard-Jones poten…
The paper develops a graphical method for deriving kinetic equations for stationary or quasi-stationary complex reactions with linear mechanisms, where each elementary stage contains at most one intermediate substance on each side. By representing intermediates and a formal zero-substance as vertice…
The study examines the contours of exciton absorption lines in mono- and polycrystalline cuprous oxide near the long-wavelength edge of fundamental absorption. Using a recording spectral setup, the spectral distribution of the absorption coefficient was measured for the yellow and green exciton seri…
This communication examines the thermal transformations of N-ethyleniminosilanes containing aliphatic, aromatic, alkoxy, and mixed substituents at silicon, with emphasis on reactions involving opening of the ethylenimine ring. Heating sealed ampoules at 200 to 300 degrees showed that several N-ethyl…
This paper develops a linear theory for calculating tidal motion in sea basins when turbulent vertical friction causes the horizontal current velocity to vary with depth. The authors formulate the harmonic tidal problem with vertical exchange, Coriolis force, tide-generating potential, bottom no-sli…
This paper examines how functional substituents separated from a benzene ring by one to three methylene groups influence the excited-state optical properties of substituted benzenes. Electronic absorption spectra and fluorescence quantum yields were measured in cyclohexane for compounds of the type …
This note studies how the cardinality of a Hausdorff space constrains the sizes of its discrete, separated, and scattered subspaces. Using transfinite decreasing sequences of closed sets, caliber arguments, and cardinal estimates including Pospisil’s theorem, it proves that for a Hausdorff space X t…
This study examines the use of nuclear magnetic resonance to distinguish types of polyvinyl chloride plasticization and to assess polymer, plasticizer interactions. Proton spin, spin relaxation times and NMR spectra were measured for PVC containing intramicellar plasticizers, dimethyl phthalate, dib…
This paper examines base induced cleavage of carbon carbon bonds in ketones and alcohols of the barene series, extending earlier observations on barenecarboxylic acid derivatives. Experiments show that 1-phenyl-2-benzoylbarene and bis(phenylbarenyl) ketone undergo alcoholysis in ethanolic sodium eth…
This study examines the radiation-catalytic decomposition of methanol adsorbed on solids with different electronic properties, extending earlier observations made for cyclohexane conversion. Methanol adsorbed on evacuated oxides, semiconductor oxides, metals, and activated carbon was irradiated with…
This study examines whether the enhanced reactivity of chlorine substituents bonded to silicon in silacycloalkanes is associated with changes in Si-Cl bond polarity. Nuclear quadrupole resonance spectra at 77 K were measured for several 1-methyl-1-chloro- and 1,1-dichloro-1-silacycloalkanes and comp…
This paper proves that in any homogeneous n-dimensional Riemannian space, two polyhedra that are equicomplementable are also equicomposable. The argument reduces the comparison to two congruent completed polyhedra and then, by successive finite rearrangements of pieces corresponding to the complemen…
This paper examines whether adsorption of organic depolarizer molecules on a stationary mercury microelectrode can be used to increase the sensitivity of polarographic determinations. Using oscillographic polarography with a stepped polarizing voltage, the authors studied weakly acidic buffered solu…
This paper examines whether surface hydroxyl groups are the active centers responsible for adsorption and catalytic activity on oxide catalysts. Using infrared spectroscopy, the author compares shifts of hydroxyl stretching bands upon interaction with basic molecules and studies aluminosilicate and …
This paper examines how electron-donor additives, water, salts, and alkylating agents affect the stereospecific polymerization of butadiene in a cobalt catalytic system based on dialkylaluminum chloride and cobalt chloride. The authors interpret experimental changes in polymer microstructure, intrin…
This paper addresses the problem of defining and measuring cloud condensation nuclei active at small atmospheric supersaturations, arguing that counting all droplets formed in a chamber can overestimate nuclei concentrations. It proposes a criterion based on droplet growth beyond the critical radius…
