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 reports the preparation of fluorine-containing silylferrocenes, a class absent from earlier series of trialkyl and aryl silylferrocene derivatives. Ferrocene was metalated with butyllithium and reacted with tris-trifluoropropylchlorosilane or dimethyl m-trifluoromethylphenylchlorosilane, …
This study examines how substituents attached to tin and to the unsaturated group influence the radical polymerization of tin-containing vinyl monomers. The authors synthesized p-vinylphenyltricyclohexyltin and p-vinylbiphenyltriphenyltin and compared their polymerization kinetics with p-vinylphenyl…
This paper examines whether humidity gradients alone can generate convective motion in a cloudless, thermally neutral atmosphere. Using simplified equations for an axisymmetric turbulent jet, the author derives approximate solutions for moist convective jets formed without local moisture sources and…
This paper examines low-temperature expansions for an isotropic ferromagnetic dielectric, focusing on the elementary-excitation spectrum, spin-wave lifetime, and magnetization for a spin-one simple cubic lattice with nearest-neighbor interaction. Using Pauli operators equivalent to the original spin…
This paper investigates how chromium and small nickel additions affect the passivation characteristics of iron-based alloys, focusing on critical passivation potentials and currents in sulfuric acid solutions. Using galvanostatic and potentiostatic polarization measurements on binary Fe-Cr alloys an…
This note studies extremal approximation problems associated with Urysohn’s metrization theorem, focusing on how changing the metric on a regular topological space with a countable base changes the corresponding class of Hölder functions. It gives a general formula for the uniform deviation of one s…
This paper reports the preparation of tris-(triphenylsiloxy)-aluminum and an accompanying tetra-(triphenylsiloxy)-sodium polyalumoxane from triphenylethoxysilane and an aqueous alkaline sodium aluminate solution. The authors describe the reaction procedure, separation of the benzene or ether soluble…
This paper examines the temperature dependence of mercury diffusion in zinc, motivated by the role of adsorption-active liquid metals in reducing metal strength and plasticity through penetration along structural defects. Using radioactive Hg-203 tracer measurements, the authors directly determined …
This paper studies boundary behavior and value distribution of meromorphic functions in the unit disk, extending Lange’s results on non-Euclidean filling disks for holomorphic functions. It introduces sequences of P-points for meromorphic functions, characterized by the property that in arbitrarily …
This paper examines the thermal stability of synthetic C32 hydrocarbons of hybrid structure, prepared as model compounds for high molecular weight petroleum hydrocarbons containing paraffinic chains and aromatic or cycloaliphatic rings. Using differential thermographic measurements with a Kurnakov p…
Ignition delays of methane mixtures with oxygen and inert diluents were investigated in reflected shock waves to determine their dependence on pressure, temperature, and mixture composition. Delays were measured chiefly with an ionization probe, with supporting optical and pressure diagnostics, and …
This paper investigates whether gelatin polypeptide chains can be chemically fixed in either helical or random coil conformations, whose interconversion strongly affects viscosity and gelation. Using purified isoelectric gelatin, chromium alum treatment at selected temperatures, dialysis, and measur…
The paper develops a general framework for generative languages, bases, and calculi in order to study when sets of words can be strictly represented by finitely specified calculi. It introduces weak decidability and decidability conditions for generative bases and proves that, in any weakly decidabl…
This study examines interactions of tributyl phosphate and its uranyl nitrate solvate with several diluents through activity coefficients in binary solutions. Vapor pressures of volatile diluents were measured by the isoteniscope method at 25, 37.5, and 50 degrees C, and activity coefficients of the…
This paper addresses the nonlinear time development of disturbances in laminar viscous incompressible flows, where conventional linear stability theory is valid only for sufficiently small times. It applies a modified small-parameter method analogous to Poincaré’s method, introducing an auxiliary ti…
This study examines whether the characteristic electronic absorption near 400 mµ in alkyl and aryl imines of aromatic ortho-hydroxycarbonyl compounds can be attributed to a benzenoid, quinoid equilibrium. The authors recorded infrared spectra for derivatives of salicylaldehyde, ortho-hydroxyacetophe…
This paper examines how an additional radio-frequency magnetic field, applied parallel to the static field, modifies electron paramagnetic resonance and gives rise to features often described as multiquantum or two-quantum transitions. The authors discuss the expected sideband structure of the reson…
This paper studies semigroups of bounded linear operators on spaces of continuous or summable periodic functions through an averaging procedure over translations. It shows that the averaged operators form a measurable semigroup commuting with translations, have no larger norm than the original opera…
A single crystal neutron diffraction study was carried out to determine the positions of hydrogen atoms in lithium sulfate monohydrate, whose heavy atom structure had previously been studied by x-ray diffraction. Measurements of h0l and 0kl reflections were used to calculate nuclear density projecti…
This paper studies solvable extensions of constant-coefficient pseudoparabolic and ultrahyperbolic operators in a parallelepiped, focusing on cases where classical local boundary conditions are inadequate. Using Fourier series in the spatial variables, it analyzes nonlocal boundary conditions linkin…
The paper develops a topological method for proving the existence of periodic solutions of differential equations whose right hand side may depend on delayed or functional arguments. Periodic solutions are represented as fixed points of a completely continuous operator on a space of continuous perio…
This study examines the formation and phase relations of double oxides produced by reactions of beta niobium pentoxide with tungsten, molybdenum, and vanadium oxides, and alpha tantalum pentoxide with vanadium oxide. Using X-ray phase analysis of annealed stoichiometric mixtures, the authors identif…
This paper examines the structure and mechanism of spin detonation, arguing that acoustic theory does not adequately account for observed breaks and terminal disturbances in the shock front. Using smoked-film trace records, ionization probes, and corona-discharge probes in methane-oxygen mixtures, t…
The paper develops a general framework for representing linear continuous operators on Banach function spaces by additive set functions with values in a Banach space. It defines spaces of such abstract functions, proves isometric isomorphisms with operator spaces and weakly continuous operator class…
This paper examines the low-temperature polymerization of vinyl chloride initiated by triethylaluminum in the presence of oxygen, a system previously reported to be ineffective under sealed-ampoule conditions. Using continuous oxidation at minus 30 degrees, the authors compare model systems correspo…
This paper examines automatic control systems with variable structure for dynamical objects whose parameters vary over wide limits. It formulates a class of nth order systems with switching coefficients and derives necessary and sufficient inequalities on the switching parameters that ensure the sli…
This study examines the formation and nature of catalytically active particles in the TiCl4, Et2AlCl system during ethylene polymerization, focusing on changes during catalyst aging. Using precipitation, chemical analysis, EPR observations, solubility tests, and polymerization kinetics, the authors …
This paper studies realizability for formulas of propositional logic in the sense of Kleene realizability under substitutions by closed logico-arithmetical formulas. It introduces several families of formulas, including variants extending Rose’s example, and proves relations among them: some are rea…
This paper examines how equilibrium constants and separation factors in isotopic exchange depend on molecular bond energy and atomic masses through the beta factor. Using known relations between vibrational frequencies, force constants, dissociation energies, and internuclear distances, the authors …
This paper develops a low-temperature theory of transport phenomena in low-mobility semiconductors with strong electron-phonon coupling, complementing earlier high-temperature small-polaron treatments. Using Kubo-type transport expressions in a localized polaron basis and transforming to band-polaro…
This study examines how replacing surface hydroxyl groups of silica gel with methoxyl groups affects ammonia adsorption, treating ammonia as an indicator of changes in specific adsorption centers. Silica gel samples were methoxylated to several degrees by repeated exposure to methanol vapor under co…
This paper formulates problems of best approximation in random normed spaces, motivated by approximation of stochastic processes observed up to a random time. It defines f-best approximation through the partial order on random norms, introduces a variance-based sigma squared best approximation, and …
This note studies real Siegel zeros of Dedekind zeta-functions and their implications for Brauer’s asymptotic formula for the class number and regulator of number fields. By combining Brauer’s method with a functional-equation argument, a generalization of Heilbronn’s theorem, and estimates for comp…
This paper investigates the linear stability of a one-dimensional Chapman-Jouguet detonation in an ideal gas with a finite chemical reaction zone governed by a kinetic law. Small cylindrical harmonic perturbations in a circular tube are introduced, reducing the hydrodynamic and kinetic equations to …
This paper reports results on cubature formulas for approximate integration over the sphere, emphasizing formulas whose nodes have the symmetry of regular polyhedra and whose construction uses group-character methods. It presents several invariant formulas exact for spherical polynomials up to speci…
This paper outlines a method for studying hypothesis tests and interval estimation problems with nuisance parameters when the underlying samples admit finite-rank sufficient statistics, leading under general conditions to exponential-family representations. The approach uses analytic continuation in…
This study examines the kinetics of coagulation structure formation in aqueous dispersions of Cherkassy palygorskite and Gorb montmorillonite clays, a problem relevant to controlling the physicomechanical properties of drilling fluids. Using a Weiler-Rebinder instrument, the authors measured limitin…
This paper examines the coexistence of block structure and nearly horizontal seismic layering in the Earth’s crust and upper mantle, as revealed by recent deep seismic sounding. The authors assess possible explanations for deep seismic boundaries, rejecting their general interpretation as stratigrap…
This paper develops a quantum statistical derivation of ferromagnetic resonance equations for a saturated, spherical, isotropic ferromagnet with spin magnetism in constant and alternating magnetic fields. Starting from the density matrix equation with exchange and dipole interactions, the authors tr…
This note studies the use of direct methods for proving existence of an optimal control in a class of Lebesgue measurable controls taking values in a closed domain. It formulates controlled processes as fixed points of uniformly contractive operators on a space of continuous vector functions and con…
This study reports apparent dissociation constants for a series of substituted cyclopropane and cyclopropenecarboxylic acids and examines how three-membered ring structure, substituent polarity, and stereochemistry affect ionization. The constants were determined by potentiometric titration at the h…
This note studies nonrandomized similar tests for the Behrens-Fisher problem for two independent normal samples with unknown means and variances, under the first three of Wald’s axioms. Reducing such tests to measurable functions of two invariant statistics, the authors distinguish regularly and sin…
The paper studies quadrics in Cayley-Klein spaces whose absolute defines a quasi-Euclidean structure, with particular emphasis on quasi-elliptic spaces. Using characteristic matrices associated with the quadric and the absolute, it establishes invariant polynomials and coefficient data under the mot…
This study examines radiolytic transformations in air-saturated ferrous sulfate solutions at varying acidity in order to compare the reactivity of hydrated electrons and hydrogen atoms. Using pulsed 1 MeV electron irradiation, the authors measured ferric ion yields as functions of dose rate, pH, and…
This study examines the decomposition behavior of chromium-based solid solutions containing niobium or titanium, materials of interest for heat-resistant alloys, using X-ray diffraction together with microstructural and microhardness observations. Alloys containing up to 5 at.% niobium and 10 at.% t…
