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 paper reports measurements of recombination radiation in lead selenide layers and compares their photoluminescence and photoconductivity spectra with those of lead sulfide layers. Using infrared spectral measurements with corrected detector response, the study finds weak room-temperature lumine…
This paper examines whether linear free energy correlation equations can be applied to keto enol equilibria in beta dicarbonyl compounds with normal chains. Treating the conjugated keto and enol systems, rather than an aromatic ring, as the transmitting framework, the authors compare literature equi…
This study reports a steroid transformation by actinomycetes, focusing on the microbiological introduction of a 17alpha hydroxyl group into pregnane steroids. Using Actinomyces spheroides LNGI-56 fermentations with progesterone and related substrates, the authors isolated or chromatographically iden…
This study examines reactions of o-carboxybenzoylferrocene with nucleophilic and phosphorus-containing reagents, extending earlier work on its acid-promoted transformations. Treatment with phosphorus trichloride gave a chloroanhydride-like product, characterized by elemental analysis, molecular weig…
The paper studies characteristic surfaces of weak discontinuity in the general equations for an ideal isotropic incompressible rigid-plastic body under smooth and piecewise-smooth yield conditions with an associated flow law. By analyzing jumps in derivatives of stresses, strain rates, and principal…
The study addresses the difficulty of obtaining stable potentials for platinum electrodes in aqueous ferrocene suspensions, caused by the low solubility of ferrocene and interference from other redox systems. An electrode reversible to the ferricinium cation was prepared by mechanically applying a m…
The paper develops a semiclassical approach to electrical conductivity for systems in which the usual Boltzmann kinetic equation is difficult to justify, especially low-mobility organic semiconductors with narrow bands and appreciable electron-phonon coupling. Starting from the Kubo correlation-func…
The study examines ethylene polymerization catalyzed by cyclopentadienyltitanium dichloride with diethylaluminum chloride or triethylaluminum in solvents containing labile chlorine atoms. Kinetic measurements in several solvents, together with EPR, visible and infrared spectroscopy, and redox titrat…
This study examines the oxidative dissolution of Yakut diamond crystals in alkali-metal hydroxide and carbonate melts under controlled gas atmospheres near 870 to 880°C. Using a quartz microapparatus with a platinum reactor, the authors measured weight loss and surface etching after exposure to air,…
This note studies necessary and sufficient spectral conditions for the limiting amplitude principle for second order evolution equations governed by a semibounded Hilbert space operator. Under hypotheses on the analytic and boundary behavior of the resolvent kernel, it formulates results connecting …
This paper studies when the asymptotic behavior of solutions of a linear nonautonomous system is preserved under nonlinear perturbations whose Lipschitz constant is controlled by a given function. It establishes necessary and sufficient integral conditions, expressed through a fundamental family of …
This study examines isotopic exchange between cyclobutane and deuterium over evaporated films of platinum, palladium, nickel, tungsten, and molybdenum at temperatures from 0 to 171°C. Using mass spectrometric analysis of deuterated products, the authors compare product distributions with predictions…
This paper argues that the usual kinetic distribution function for a rarefied gas gives only the mathematical expectation of particle numbers in phase space and does not by itself provide a full probabilistic description of the gas motion. For a simple gas of structureless particles, it derives the …
This paper examines the moisture-dependent coloration and optical properties of 4-chloro-2-sulfobenzalacetophenone, whose free sulfonic acid becomes intensely yellow on drying while its moist form, aqueous solution, and sodium salt remain nearly colorless. The authors compare ultraviolet absorption …
This note formulates a constructive version of locally convex linear topological spaces, giving axioms for the underlying linear structure, neighborhoods of zero, continuity of addition and scalar multiplication, and comparison of topologies. It examines constructive analogues of closedness and sepa…
This study examines how fillers affect the aging of polydimethylsiloxane rubber, focusing chiefly on silica filler under oxidative heating and vacuum heating conditions. Using filled and unfilled rubber samples, the authors compare methyl group cleavage, evolution of low molecular organosilicon comp…
This paper investigates the reactivity of carbo- and dimethinemerocyanine dyes toward quaternary salts of beta-chlorovinyl derivatives of heterocyclic bases, proposed as highly active electrophilic reagents. The authors show that these salts react at room temperature in anhydrous chloroform, without…
This note studies limits in measure and limiting functions for sequences of measurable functions, comparing their behavior with that of trigonometric series and series in normalized bases of spaces Lp, p greater than 1. It introduces narrow upper and lower limits in measure and associated sets of su…
This paper generalizes a theorem of Sklyarenko on extending perfect mappings from completely regular spaces with bicompact extensions to the setting of T1 spaces and omega alpha extensions. It proves several lemmas on Wallman extensions, maximal centered systems of closed sets, and the behavior of r…
The paper develops iterative formulas for refining approximate inverse matrices by applying the method of variation of a parameter to a matrix equation involving an auxiliary parameter matrix. Starting from an approximate inverse, the approach interprets refinement as numerical integration of differ…
This paper examines the pinch effect in an electron, hole plasma of indium antimonide under conditions where experimental densities and temperatures imply strong degeneracy. Using a simplified free electron, hole gas model, the analysis replaces classical plasma pressure with the pressure of a degen…
This paper examines changes in electrical conductivity and magnetic susceptibility during melting for semiconductor compounds with ZnS, NaCl, and anti-CaF2 type structures. Comparing series with cationic substitution, anionic substitution, and isoelectronic composition, the authors show that some co…
This note studies approximation of bounded periodic functions in a Hausdorff-type metric defined through supplementary graphs, allowing treatment of functions with jumps under a modulus of nonmonotonicity. It establishes a general estimate for convolution approximants with nonnegative even kernels, …
This paper examines the unresolved kinetics of mutarotation in aqueous monosaccharide solutions, focusing on whether two-component and three-component reaction schemes adequately describe observed polarimetric behavior. Experimental data for d-xylose, d-galactose, and l-arabinose are compared with e…
The paper studies ill-posedness in optimal planning problems formulated as linear programming with possibly dependent constraint equations and data known only approximately. It shows by example that arbitrarily small perturbations of coefficients and right-hand sides can produce arbitrarily large ch…
The paper examines the alkaloid composition of the aerial parts of Vinca erecta collected in the Tashkent region and compares changes in total alkaloid content across stages of plant development. Using ether extraction, fractionation into phenolic and nonphenolic bases, buffer separation, chromatogr…
The paper develops a theoretical description of ion and atom reflection from solid surfaces at medium and high incident energies, where inelastic losses and lattice binding can be neglected. Using a screened Coulomb interaction, specifically Firsov’s Thomas-Fermi potential, it treats reflection as a…
This study examines how high hydrostatic pressure affects ultrasonic longitudinal wave velocities in oil and gas reservoir rocks from the Caspian Lowland and Baku Archipelago of Azerbaijan, with relevance to ultrasonic logging and seismic prospecting at great depths. Using an ultrasonic pulse method…
This paper examines the spectral width of radiation from a quantum generator, with particular application to a ruby laser. Starting from the Hamiltonian for a two-level atomic system interacting with a quantized radiation field in a resonator, the author derives equations for photon populations, pop…
This paper analyzes quantum depolarization of high energy electrons in storage rings, complementing the known radiative polarization mechanism in a magnetic field. Using the classical spin precession equations with perturbing radial and azimuthal magnetic fields, while treating synchrotron radiation…
This study examines synthetic sodium, potassium, and sodium, potassium chabazites prepared from alkaline silica alumogels and compares their structures and adsorption behavior with natural chabazite. X-ray diffraction, chemical analysis, thermal stability observations, and adsorption isotherms for n…
This note develops a theory of the first variation for broad variational problems, including optimal control problems, formulated through quasiconvex families of measurable vector fields. It defines quasiconvexity, gives common examples involving essentially bounded and \(L^p\) controls, and uses an…
This note studies rates of convergence in the central limit theorem for sums of independent identically distributed random variables whose distribution lies in the domain of attraction of the normal law. It gives necessary and sufficient conditions for the uniform error in approximation by the norma…
This study investigates the proposed adsorption mechanism by which thin films of surface-active metallic melts reduce the strength and plasticity of more refractory metals, focusing on direct measurement of surface tension changes in solid zinc. Using the zero creep method near the melting temperatu…
This note studies sequences that are almost periodic with respect to generalized shift operators generated by ultraspherical orthogonal polynomials. Building on earlier work of Levitan, it defines the relevant scalar product and Fourier coefficients, then proves that Parseval’s equality holds for th…
This paper reports the synthesis of new organosilicon tri- and tetrahydric ether alcohols containing β-hydroxyethoxymethyl groups. The compounds were prepared by acid-catalyzed cohydrolysis of 1,1-dimethylsila-2,5-dioxacyclohexane with methyl-, ethyl-, and phenyltriethoxysilanes or tetraethoxysilane…
The paper examines the morphology and crystal structure of yttrium hydroxychloride, YCl(OH)2, obtained during hydrothermal synthesis of yttrium-iron garnet. Photogoniometric measurements and X-ray diffraction are used to determine orthorhombic symmetry, unit-cell parameters a = 6.21 Å, b = 12.56 Å, …
This paper develops a thermodynamic treatment of oxidation and reduction equilibria in ionic crystals containing multivalent substituent cations and cation vacancies. By minimizing the free energy, including vacancy formation, oxidizer chemical potential, oxidation work, elastic energy, and configur…
Electron paramagnetic resonance of cerium ions in lead molybdate single crystals with scheelite structure was investigated at 4.2 K, using crystals doped with nominal cerium and ytterbium and charge compensated with sodium molybdate. A single intense resonance line attributed to cerium was observed …
High-temperature cracking of ethane was studied to clarify how secondary products, especially methane, coke, divinyl, allene, and methylacetylene, are formed. Flow experiments at 800 to 920°C and low pressure used small additions of radiocarbon-labeled acetylene, with corundum or quartz as heat carr…
This paper develops kinetic equations for the radiation-induced accumulation and coagulation of electron centers in alkali-halide crystals, with emphasis on F and M centers in LiF irradiated by protons. Starting from coagulation volumes for reactions between F centers and complex centers, the author…
This paper examines direct fluorovinylation as a preparative route to fluorovinyl derivatives, focusing on reactions of fluorinated olefins with metallic derivatives of nitrogen and silicon compounds. Lithium and potassium amides derived from secondary aliphatic and aromatic amines, as well as carba…
The paper extends decomposition criteria known for groups to a broader class of algebras, including loops, equipped with a distinguished element and operations satisfying specified compatibility conditions. It develops a notion of normal divisor as a homomorphism kernel, proves characterizations via…
