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 extends kinetic measurements of C5 dehydrocyclization on platinized carbon to 3-ethylpentane, isobutylbenzene, and sec-butylbenzene, comparing paraffinic and alkylbenzene substrates that form single cyclization products. Product yields as functions of contact time and temperature indicate…
This note develops an analogue of Fisher information for parametric families whose densities need not be differentiable with respect to the parameter. It first introduces a nonsymmetric divergence between two probability measures and records its basic properties, including separation, monotonicity u…
This study examines the mechanism of electrical conductivity in thermally treated polyacrylonitrile fibers by measuring temperature dependences of resistance and thermoelectric power in high vacuum for specimens prepared at different treatment temperatures. Heating in vacuum irreversibly lowers resi…
This paper reports an emulsion study of inelastic interactions of 7.5 BeV pions with nucleons in nuclear-emulsion material, based on 2100 recorded interactions from which 200 pion-nucleon events were selected. The authors identify secondary pions, protons, and K mesons, analyze their angular and mom…
This study examines how aggregation state and electron-acceptor additives affect the optical absorption and photoelectric response of thin magnesium phthalocyanine layers. Vacuum-sublimed, solvent-treated, annealed, and solution-deposited films were characterized by absorption spectroscopy, microsco…
This paper generalizes the notion of reductive homogeneous spaces to cases where an invariant affine connection cannot in general be introduced. It defines classes of homogeneous spaces indexed by a positive integer and corresponding families of differential groups, using decompositions of the stati…
This study examines why concentrated emulsions and polymer latices can show high aggregative stability even when measured adsorption layers of surfactants appear weak. Using measurements of limiting shear stress at water, xylene interfaces for OP-10, Nekal NB, and Pluronic surfactants, together with…
This paper examines whether the deflection of light in galactic gravitational fields could make otherwise screened background galaxies observable. Using the relativistic light deflection formula, it derives conditions for observing axial and off-axis screened galaxies, including limits set by galaxy…
The paper studies the spectral function of a self-adjoint elliptic differential operator, with emphasis on its smoothness near the boundary of the domain. It first formulates expansions in generalized eigenvectors for rigged Hilbert spaces and Carleman operators, showing that the spectral projection…
This paper applies Linnik’s dispersion method to several binary additive problems involving primes, products, and binary quadratic forms. It derives lower estimates for the number of representations of primes in the form p equals a shifted value of a quadratic form, yielding infinitude results for p…
This paper studies free polynilpotent groups defined by iterated terms of lower central series, a class that includes free solvable groups, and develops parallel notions for Lie rings. It proves that the Lie ring associated with a free polynilpotent group is the corresponding free polynilpotent Lie …
This study examines the formation and rapid gas-phase transport of fission-product zirconium-97 as volatile zirconium tetrachloride during the slowing down of fission fragments in chlorine-containing and related gas mixtures. Using a flow fluoroplastic ampoule with an enriched uranium oxide target, …
This paper studies boundary behavior of generalized solutions to uniformly elliptic Dirichlet problems with zero boundary data in bounded domains, using Wiener capacity conditions near a boundary point. It proves that an averaged positive capacity condition for the complement implies a Hölder estima…
This paper reports ligand exchange reactions of ferrocene, previously considered resistant to replacement of its cyclopentadienyl rings. Heating ferrocene or substituted ferrocene with aromatic hydrocarbons in the presence of aluminum chloride, often with aluminum powder as a reducing agent, replace…
This paper establishes a priori estimates for generalized solutions and subsolutions of second order elliptic and parabolic equations in divergence form with measurable uniformly elliptic leading coefficients and lower order terms in Lebesgue spaces. Using integral inequalities and iteration methods…
This study investigates the mechanism of the polymorphic transition in p-dichlorobenzene between the low-temperature monoclinic alpha phase and the high-temperature triclinic beta phase. Using optical microscopy with controlled heating and X-ray Laue photography of the same crystals before and after…
This study examines heterogeneous crystallization in lithium aluminosilicate photosensitive glass, focusing on how precrystallization treatment controls silver crystallization centers and the resulting microstructure. Glass samples were ultraviolet irradiated, subjected to slow heating or single and…
This study examines chemical polarization and activation barriers in high-temperature oxide melts, focusing on the reduction of FeO in aluminosilicate slag by carbon dissolved in liquid iron. The authors combine kinetic measurements using electrocapillary motion of metal droplets with anodic polariz…
This paper investigates the reaction of phosgene with acylmethylene and vinylene homolog derivatives of N-substituted heterocyclic bases, including benzthiazoline, thiazoline, benzselenazoline, indoline, and dihydroquinoline systems. The authors show that phosgene converts these compounds in high yi…
The paper proposes a method for converting an m-row numerical code, in which a number is represented as a sum of several positional-code summands, into a single-row code more rapidly than by successive addition. It derives a digit-wise transformation that reduces the number of rows from m to the sma…
The paper develops a vertically averaged nonadiabatic model of large-scale atmospheric motion that incorporates radiative and turbulent heat fluxes, latent heat release, and surface friction. Starting from vorticity and heat-influx equations in pressure coordinates, the authors derive a quasigeostro…
Electron paramagnetic resonance was used to study bis-dimethylglyoximato-copper(II) in crystalline form and in water, methanol, and dioxane solutions, with attention to the Cu, N bonding and hyperfine structure. The crystalline compound shows an S = 1/2 spectrum with no evidence of exchange pairing …
This study examines the formation and properties of solid solutions between tricalcium silicate, a principal cement mineral, and yttrium oxyorthosilicate, motivated by possible crystal-chemical similarity and calcium-yttrium isomorphism. Mixtures containing varying amounts of yttrium oxyorthosilicat…
This paper generalizes experimental viscosity data for saturated paraffin hydrocarbons from methane through n-octane over broad temperature and pressure, or density, ranges. Using a corresponding-states formulation, the authors reduce viscosity increments relative to atmospheric-pressure values by t…
This study examines the solid-state thermal substitution of ammonia by nitrite ions in optically active cis-diamminobis(ethylenediamine)cobalt(III) nitrite as a means of probing the reaction mechanism. Heating the active nitrite at 105 to 110 degrees for 12 hours gave inactive cis-dinitrobis(ethylen…
This study examines the orientation of addition reactions of representative electrophilic and nucleophilic reagents to the unsymmetrical conjugated diyne ethyldiacetylene, or hexadiyne-1,3. Bromine, hydrogen bromide, sodium methylate, and sodium ethyl mercaptide were tested, and the products were ch…
This study examines whether heterogeneous catalysts known to promote gas-phase hydrocarbon oxidation can increase the selectivity of liquid-phase isobutylene oxidation. Liquefied isobutylene was oxidized with air at 140 degrees and 50 atm in a stirred autoclave in the presence of several metal oxide…
The study examines intraparticle diffusion of several organic cations in KU-2 sulfonic cation exchangers with divinylbenzene contents from 2 to 20 percent. Sorption rates were measured under static conditions during the initial exchange period at different temperatures, and diffusion coefficients, a…
This study examines the cathodic reduction of oxygen on smooth platinum in alkaline solution using a rotating disk electrode with a ring electrode to clarify whether hydrogen peroxide is formed as an intermediate. Polarization measurements in 0.125 N potassium hydroxide, supported by ring detection …
This study examines whether phenyl radicals generated from benzoyl peroxide in benzene undergo intramolecular isomerization before forming diphenyl. Benzoyl peroxide labeled with carbon 14 at the ring carbon bonded to the carboxyl group was used in both thermal reactions and photodecomposition, and …
This paper reports an experimental attempt to observe electron paramagnetic resonance by detecting electron spin induction, analogous to Bloch’s nuclear induction method. The authors argue that, under a static magnetic field and a perpendicular microwave field, electron spins should produce a transv…
This paper examines elementary stages in the heterogeneous recombination of hydrogen atoms on an aluminum surface, with particular attention to chemisorption heat, desorption, and the influence of gas pressure and catalyst temperature. Using experimental recombination data and graphical calculations…
This paper examines whether transition metal compounds with suitable electronic configurations can display carbenoid reactivity, using in situ generated titanocene and diphenylacetylene as a test case. Reaction of titanium tetrachloride with sodium cyclopentadienide in the presence of tolane gave a …
This study examines homomolecular oxygen isotope exchange on ZnO and NiO at room temperature, comparing behavior with the more commonly studied high-temperature region. Using prepared oxide samples conditioned in vacuum and exposed to oxygen isotope mixtures, the authors measured exchange kinetics a…
This paper develops an asymptotic procedure for studying transient processes in weakly nonlinear oscillatory systems with many degrees of freedom, formulated as a system of second order differential equations with a small parameter and periodic forcing variables. Under assumptions on the characteris…
The paper introduces a special case of local topological products, formed by replacing selected fibers over open subsets of a base space by two-point fibers while collapsing fibers elsewhere, and extends the construction to arbitrary systems of open sets via inverse spectra. It establishes preservat…
This paper investigates the initiation and development of localized plasticity bands in thin steel plates containing a crack-like slit and subjected to tensile loading perpendicular to the concentrator. Experiments on normalized and polished mild steel specimens identify successive deformation stage…
The paper develops a theory of absolutes for arbitrary Hausdorff spaces with respect to irreducible theta-continuous closed mappings. It constructs, for each Hausdorff space, a hyperabsolute as the space of maximal centered systems of open sets and identifies the subspace of proper ends as the absol…
This study examines how different adsorbed forms of oxygen on titanium dioxide affect its photoactivity toward hydrogen photosorption. Using manometric measurements together with electrical conductivity monitoring over 90 to 600 K, the work identifies sequential irreversible transformations of adsor…
This study examines the bonding heterogeneity of oxygen adsorbed on platinum films through isotopic exchange between gaseous and adsorbed oxygen, together with homomolecular oxygen isotope exchange. Platinum films were prepared in vacuum, treated with oxygen under different temperature conditions, a…
The paper examines the anomalously rapid decomposition of benzoyl peroxide during polymerization of phenylacetylene and related acetylenic hydrocarbons. Using kinetic measurements in phenylacetylene, deuterated phenylacetylene, methylphenylacetylene, and inhibited systems, the authors compare peroxi…
This study investigates the coextraction of calcium and strontium from weakly alkaline aqueous media with 8-hydroxyquinoline complexes of scandium, neodymium, thorium, and aluminum in benzene. Using radioactive tracers, pH-controlled extraction experiments, back-extraction, spectrophotometry, electr…
This paper investigates radiationless migration of triplet-level excitation energy in benzophenone crystals using naphthalene and naphthacene impurities as energy acceptors. Luminescence spectra, quantum yields, and emission lifetimes were measured at low temperature for purified benzophenone crysta…
This study examines the effect of hydrostatic pressure on the dielectric properties of polycrystalline Ba(Ti0.9,Sn0.1)O3 near its ferroelectric phase transition. The dielectric permittivity was measured at 800 Hz while heating the specimen from 20 to 60 degrees under constant pressures up to 4200 kg…
This note studies infinite-dimensional linear groups that satisfy finiteness conditions making them close to finite-dimensional linear groups, especially local versions of admissible finite-dimensional representation and finite-dimensional generated operator algebra. It introduces and compares sever…
The note studies uniqueness for entire functions represented by absolutely convergent Dirichlet series with positive real exponents and bounded on the real axis. For exponent sequences satisfying \(\lambda_n \sim c n^{1/q}\), \(1<q<2\), it proves that if the majorant \(M_F(x)=\sum |a_n|e^{\lambda_n …
This study examines phototransformations of free radicals formed in gamma irradiated polypropylene, using electron paramagnetic resonance spectra measured after irradiation, illumination, and controlled heating. The authors show that short wavelength ultraviolet light at 77 K converts allyl radicals…
This paper studies the analytic structure of strongly connected Feynman diagrams contributing to the nucleon photon vertex part in perturbation theory. Using majorization by a third order diagram, the authors determine a real and complex domain of analyticity in the three invariant variables and der…
This paper develops nonlinear equilibrium equations for shallow three-layer shells of nonsymmetric construction undergoing large deflection. Using Kirchhoff-Love assumptions for the load-bearing layers, a transversely isotropic rigid core with transverse compression neglected, and a linear approxima…
