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 how small additions of water affect butadiene polymerization in benzene using a cobalt chloride pyridine complex with diisobutylaluminum chloride. Using carefully dried, oxygen-free apparatus and dilatometric kinetic measurements, the authors varied initial water and cobalt conce…
This study investigates the piezoelectric effect in nepheline-bearing alkaline igneous rocks, motivated by the industrial importance of nepheline and by earlier work on piezoelectric effects in quartz-bearing rocks. The author derives the expected tensor behavior for a nepheline piezoelectric textur…
The paper studies sums of binary random variables forming an inhomogeneous two state Markov chain and asks when a central limit theorem together with convergence of absolute moments of order p is applicable. It introduces quantities describing products of transition differences and variances, then f…
The paper derives expansion formulas for Kampé de Fériet double hypergeometric functions of higher order, a class that includes the Appell functions as special cases. Using direct rearrangement of convergent double series rather than symbolic differential operators, it establishes two general theore…
This study examines how the adsorption of cesium and sulfate ions on platinum depends on electrode potential, with emphasis on the structure of the electrical double layer and behavior at high anodic potentials. Using radiolabeled sulfuric acid and cesium sulfate solutions, the authors measured ion …
This study examines the conditions under which the primary oxide film on aluminum is destroyed during oxidation in neutral potassium chloride solutions. Electrode potentials of aluminum were measured over time at 20, 25, 28, and 30 °C across concentrations from 0.001 N to near saturation, and the re…
This paper develops a theoretical treatment of how climatic factors influence photosynthesis and productivity in plant canopies. Starting from a kinetic relation between carbon dioxide assimilation and photosynthetically active radiation, it formulates vertical profiles of radiation, carbon dioxide …
This study determines the gas-phase molecular structure of alpha-pinene oxide by electron diffraction, following earlier proton magnetic resonance evidence for a specific conformation. Electron-diffraction patterns of the vapor were recorded at two nozzle-to-plate distances and two accelerating volt…
This study examines the electrical conductivity of molten binary nitrite-nitrate systems with common alkali-metal cations, Li, Na, K, Rb, and Cs, in order to assess their behavior as near-ideal ionic liquids and to test the applicability of Frenkel’s conductivity formula. Conductivity measurements f…
This paper presents numerical calculations of the thermal evolution of Mars and the Moon, using assumed radioactive element abundances, density structures, melting intervals, and temperature-dependent thermal conductivity. For Mars, the calculations indicate that melting likely began at depths of se…
The paper develops a modification of the sieve method that extends lower-bound results from the rational integers to arbitrary algebraic number fields, overcoming limitations caused by the weaker known zero-free region for Dedekind zeta-functions. The argument uses a zero-density estimate for zeros …
The paper studies convergence and uniqueness constants for a broad class of interpolation problems that includes the Abel-Goncharov, Pommiez, and generalized gamma problems, in spaces of analytic or entire functions defined by coefficient growth. Using estimates for interpolation polynomials, recurr…
This paper reports a stage in a systematic investigation of rare earth silicates, focusing on the synthesis and characterization of new europium silicates and the growth of single crystals of several rare earth silicate compounds. Using phase diagram studies, coprecipitated stoichiometric mixtures, …
This paper studies fixed point properties of one-dimensional acyclic continua, in connection with a problem of P. S. Aleksandrov concerning arbitrary continuous self-maps. It proves that a continuum has the fixed-point property if it can be epsilon-mapped onto finite trees so that inverse images of …
This paper reports measurements of selected absorption reactions of fast positive pions by light nuclei in nuclear photoemulsion. Fine-grained emulsions irradiated with 80 ± 6 MeV pion beams were scanned for multiparticle disintegration events involving gray tracks and heavy-particle tracks, and 789…
The paper studies automorphic solutions on a fundamental polygon of a Fuchsian group for a generalized analytic equation of the form ∂U/∂z̄ = A(z)Ū, allowing prescribed poles and discontinuous coefficients. Using the standard factorization of meromorphic generalized analytic functions, it reduces a…
The paper analyzes electromagnetic radiation produced when a point charge moves along the axis of a semi-infinite circular waveguide, either entering or leaving its open end. The field is represented by a Hertz vector split into the field of a uniformly moving charge in free space and an unknown fre…
The paper studies the synthesis of linear automatic control systems subject to bounded disturbances, with the objective of minimizing the maximum accumulated error at a fixed terminal time. It considers systems in which a variable gain coefficient may be chosen from a bounded class of piecewise cont…
The paper studies the inclusion structure of closed classes of functions in countably valued logic under closure by superposition, with particular attention to classes of finite height. It defines height for closed classes and constructs, using specially encoded unary functions indexed by infinite s…
This study examines hydrogen-migration isomerization of the n-propyl radical in liquid-phase peroxide decompositions, using isotopic labels to detect small amounts of rearranged product. Butyryl peroxides labeled with deuterium or tritium in the alpha position were decomposed in carbon tetrachloride…
This study examines anomalous reactions of acid esters with lithium alkyls, focusing on the proposed role of beta-keto esters as intermediates in ketone formation. By replacing ether or tetrahydrofuran with n-hexane to slow the reaction and reduce competing alkoxide-mediated condensation, the author…
This paper studies orderedness of characteristic matrix functions associated with simple dissipative Volterra operators whose imaginary component is two-dimensional, a property equivalent to unicellularity of the operator. Using multiplicative Stieltjes integral representations and canonical factori…
This paper studies two-phase and one-phase Stefan-type free-boundary problems for quasilinear parabolic equations with discontinuous spatial coefficients and nonlinear boundary conditions, including radially symmetric cylindrical and spherical cases after transformation. It constructs an implicit fi…
New ruthenium(III) and iridium(III) phthalocyanine complexes were prepared by refluxing phthalonitrile with the corresponding chlorides and purified by extraction and reprecipitation from sulfuric acid. The study determines their compositions, solubility and acid base behavior in concentrated sulfur…
The paper proves the existence, for every infinite cardinal weight and every natural dimension n, of a compact Hausdorff space of that weight and dimension n that contains a topological image of every completely regular space of weight at most that cardinal and dimension at most n. The argument cons…
This paper extends estimates for eigenvalues obtained from a quotient of a trial vector and its image to arbitrary normal operators in Hilbert spaces of functions or sequences. It proves that if the pointwise ratio of Af to f has its values in a disk, exterior disk, or half-plane on the Riemann sphe…
The paper analyzes singularities of solutions to the Bethe-Salpeter equation in the complex angular-momentum plane for scalar meson models, extending earlier massless and zero-energy results to nonzero particle masses and total energy. Using comparison estimates for the kernels in the ladder approxi…
The paper proposes a planar graphical method for representing liquid-liquid equilibrium isotherms in four-component systems, as an alternative to spatial tetrahedral diagrams. The method unfolds the tetrahedron into a quadrilateral with two triangular projections, decomposing each quaternary composi…
This study reports an observed effect of gamma irradiation on the phase composition of lithium aluminosilicate glass-ceramics. Transparent glass-ceramic samples containing beta-eucryptite were irradiated with Co-60 gamma rays at doses from 10^2 to 10^5 r, and their phase changes were examined by X-r…
This study examines the relative stability of the N-glycosidic bond in p-carboxyphenyl glycosylamines containing D-glucose, D-galactose, D-xylose, and L-arabinose residues. To avoid uncertainties associated with polarimetric measurements and possible tautomerism, the authors developed a colorimetric…
This paper investigates the sectorial distribution of nitrogen, boron, and aluminum impurities in cubic beta-SiC crystals grown from the gas phase by thermal decomposition of methyltrichlorosilane in hydrogen. Using natural faceting, etching behavior, transmitted-light observations, resistivity meas…
This study examines the liquid phase oxidation of low concentrations of carbon monoxide using acidic palladium and copper salt solutions, motivated by analogies with platinum group catalyzed olefin oxidation. Experiments in a flow reactor at 20 to 60°C varied carbon monoxide concentration, gas flow,…
This paper describes the synthesis of symmetrical and unsymmetrical alpha,alpha-prime-difluoro-alpha,alpha-prime-dialkylethylenes using aliphatic and aromatic organolithium compounds with tetrafluoroethylene or trifluoroolefin precursors. The authors examine how reaction temperature and the structur…
This paper examines thermodiffusion fractionation of polymer solutions, focusing on polyisobutylene in heptane and on the limitations imposed by high molecular weight. Using a vertical thermodiffusion column, the authors compare concentration and intrinsic-viscosity changes over time and relate them…
This paper introduces and studies several classes of mappings for proximity spaces intended to parallel open, closed, and preclosed mappings in topology. It defines proximally open, weakly open, regular, almost regular, and almost factor mappings, establishes characterizations in terms of closeness,…
The paper studies classical solvability of diffraction problems for second order elliptic and parabolic equations with coefficients having jump discontinuities across interfaces between media. It formulates model boundary and initial boundary value problems with continuity of the solution and conorm…
Pentafluorophenylmagnesium chloride was prepared from pentafluorochlorobenzene by an entrainment reaction with ethylene bromide in ether, providing a more accessible route to pentafluorophenyl derivatives than routes based on bromo or iodo precursors. Its reactions with water, carbon dioxide, iodine…
This paper develops kinetic equations for nonequilibrium plasma processes that include nonlinear wave interactions, considering both the case of vanishing mean fields governed by correlations of random phase-density and field fluctuations, and the limiting Vlasov case with neglected correlations. Th…
The paper develops the kinematic theory of three related six-link mechanisms for generating algebraic curves of parabolic and hyperbolic type. Using geometric relations among sliders, levers, and fixed guides, it derives equations for the paths traced by selected mechanism points, including third-or…
The paper investigates the catalytic activity of exceptionally clean platinum surfaces in the oxidation of hydrogen, addressing conflicting earlier interpretations that attributed activity either to clean platinum or to gas-activated and contaminated surfaces. Using ultrahigh-vacuum preparation, cle…
This study examines strength-related characteristics of chemical bonding in titanium-oxygen alloys in the alpha-titanium solid-solution range, with particular attention to the compounds Ti6O and Ti3O formed during prolonged annealing. Alloys containing 0 to 32 atomic percent oxygen were prepared, an…
This paper studies when a connected semisimple algebraic group over a number field splits after completion at prime divisors of the ground field. Using the correspondence between forms of a split semisimple Lie algebra and Galois cohomology classes in the automorphism group, the argument reduces loc…
This paper examines the use of electron microscopy and X-ray phase analysis for studying glass-crystalline materials, with emphasis on controlling glass crystallization in sitall production. Using carbon and platinum-carbon replicas of etched fracture surfaces together with powder X-ray diffraction,…
This study examines how substituent electronic effects are transmitted through azomethine-containing bridges in aromatic Schiff bases and related quaternized compounds. Acid ionization constants were measured potentiometrically for several substituted phenolic series, and the results were correlated…
The paper investigates the addition of nitrosyl chloride to three simple vinyl ethers, methylisopropenyl, methylpropenyl, and methyl-alpha-phenylvinyl ethers, in order to assess the effect of electron-donating methoxy substitution on reactivity and product formation. Low-temperature reactions in eth…
This note studies the asymptotic behavior of solutions to homogeneous systems of integral equations arising in mathematical physics, including Wiener Hopf systems, paired integral equations, and transposed paired systems. Using Fourier transform methods and spectral conditions on exponentially decay…
This paper reports a preparative synthesis of previously unknown 5,5-dialkyl-substituted delta-2-pyrazolines by condensation of tertiary acetylenic chlorides with anhydrous hydrazine. The reaction affords liquid nitrogenous products of composition CnH2nN2 in moderate yields, and their structures are…
This paper addresses the synthesis of alpha,beta-unsaturated ketones containing cyclopropyl groups, compounds not readily accessible by Kondakov-type methods because Lewis acids can isomerize the cyclopropane ring. The authors develop a route based on the reaction of isocrotyllithium, generated from…
