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 addresses the previously unresolved synthesis of hexacyanoplatinate salts of tetravalent platinum, whose preparation by conventional cyanide substitution had been hindered by reduction to divalent platinum in alkaline media. The authors report a solid-state reaction between potassium iodo…
The paper studies first-order systems of partial differential equations for two functions of two variables whose solution sets, interpreted as mappings of the plane, form groups under composition. It shows that, subject to the identity solution condition, this requirement is equivalent to Lie invari…
The paper studies finite groups that factor through or contain maximal subgroups satisfying a generalized decomposability condition relative to a set of primes. It extends questions about solubility and supersolubility of products of subgroups to the settings of Pi-separability, Pi-solubility, stron…
The study examines the kinetics and mechanism of the Beckmann rearrangement of cyclododecanone oxime to the corresponding lactam in concentrated sulfuric acid and oleum. Reaction rates were measured spectrophotometrically over a range of temperatures and acid compositions, and effective first order …
This paper develops a theoretical treatment of porous gas electrodes that explicitly incorporates pore structure into macroscopic electrochemical behavior. The electrode is modeled as an isotropic network of tortuous pores filled selectively by electrolyte or gas according to capillary pressure, and…
This study examines partial instability constants for geometrically isomeric divalent platinum diamine complexes of the type [Pt(a)2Cl2], extending earlier work on ammine complexes to methylamine and ethylamine derivatives. Cis and trans isomers of the methylamine and ethylamine complexes were synth…
This paper addresses the limited availability of aromatic organogallium compounds beyond triphenylgallium and develops a Grignard-based synthesis of triarylgallium derivatives from gallium trichloride. Because the products are sensitive to water and oxygen and cannot readily be separated by hydrolys…
This study compares the photochemical and radiation-chemical reduction of aqueous silver perchlorate in the absence and presence of organic additives, using ultraviolet irradiation and X-rays under deoxygenated conditions. Silver ions were not appreciably reduced without additives, but alcohols, gly…
This paper proposes a method for determining the stereochemistry of mercury salt addition to olefins using the mercury salt of trinitromethane in aqueous solution. The argument is based on the differing acid stability of possible addition products: formation of trinitromethylmercuri derivatives indi…
This paper studies finite systems of linear inequalities with real parameters over a real linear space, focusing on transformations called convolutions or collapses relative to a subspace. It characterizes such combinations through cones of nonnegative dependencies among the restricted linear functi…
This paper examines the surface properties of calcium fluoride based oxide fluoride melts and their relation to melt composition, especially the replacement of fluoride ions by oxide ions. Surface tension was measured by the sessile drop method at 1470 to 1550°C, surface potentials were compared ele…
The study examines reactions of phenyldiazonium fluoroborate in different solvents, prompted by the low yields of diarylhalonium salts obtained in halobenzenes. While acetone and dimethylformamide increased halonium salt formation, dimethyl sulfoxide gave unexpected dimethylphenylsulfoxonium salts i…
This note studies extension problems for functions in anisotropic Nikol’skii type spaces defined by mixed smoothness conditions in the variables. It proves that functions, and more generally prescribed normal derivatives, belonging to the corresponding boundary class can be extended from a hyperplan…
This paper develops general equations for the equilibrium and free vibrations of thin three-layer shells of asymmetric construction with an orthotropic rigid core that may undergo transverse compression. Using the middle surface of the core as the reference surface, the authors assume Kirchhoff Love…
This paper extends variational methods for operator equations in Hilbert space from the self-adjoint positive case to certain non-self-adjoint equations. It introduces an auxiliary operator B and uses the notions of B-symmetry and B-positivity to define B-extensions, a corresponding energy space, an…
This paper describes the catalytic conversion of esters of gamma-ketocarboxylic acids into corresponding gamma-lactams under reductive amination conditions. Esters of gamma-ketoenanthic acid and its alpha-methyl homolog were treated with hydrogen and ammonia over skeletal nickel aluminum catalyst at…
This paper investigates the moving-boundary method as a basis for rapid qualitative and quantitative microanalysis of chemical elements in capillaries under strong electric fields and hydrodynamic counterflow. It derives and discusses conditions governing boundary stability and width, including diff…
This study examines how paramagnetic ions influence the magnetic relaxation of fluorine nuclei in concentrated fluoride solutions, a case for which prior data were apparently lacking. Using resonance measurements at 12.5 MHz, the authors compare the effects of Cu2+, Mn2+, Fe3+, Co2+, Ni2+, and Cr3+ …
The paper proposes a method for treating kinetic problems in rarefied gas aerodynamics without constructing the full molecular distribution function. It expands the distribution function in generalized Hermite polynomials, whose leading coefficients correspond to principal macroscopic gas characteri…
The paper introduces a notion of Dini convergence for Moore Smith sequences in a prescribed family of real valued functions, defined by the existence of monotone squeezing sequences with a common pointwise limit. It shows that for systems of continuous functions this convergence implies local unifor…
This paper reports the synthesis of new symm-triazine derivatives containing O-alkylhydroxylamine and O,N-dialkylhydroxylamine groupings, motivated by the herbicidal relevance of both triazines and alkylhydroxylamine derivatives. The authors prepared 2-chloro-4-dialkylamino-6-methoxyamino-symm-triaz…
This note studies completeness of exponential systems of the form {e^{λ_n z}} in closed horizontal strips, extending earlier results for open strips. It gives sufficient conditions, formulated through a decomposition of the exponent sequence and zeros of entire functions of exponential type, under w…
This study examines how small additions of foreign oxides affect the reduction of uranium trioxide by cracked ammonia, using continuous weighing in a high-vacuum circulation apparatus and X-ray phase analysis of reduction products. Additions of 5 mol.% ZnO and TiO2 accelerated the reduction of UO3, …
This study determines overall instability constants for palladium(II) complexes of the type K2[PdX4], focusing on chloride, bromide, iodide, and thiocyanate ligands. A potentiometric method with a spongy palladium electrode was used to measure equilibrium potentials in solutions of the complexes wit…
This note studies the linear stability of Taylor flow, the motion of a viscous incompressible fluid between coaxial rotating cylinders, in the large Reynolds number regime. The eigenvalue problem for viscous perturbations is reduced to a single ordinary differential equation and compared with the li…
This paper proposes a one-dimensional metallic model for polymers composed of molecules with conjugated double bonds, motivated by their unusually high electrical conductivity and narrow electron paramagnetic resonance signals. Treating sufficiently long conjugated chains as conductors with allowed …
The study investigates the mechanism of radiation-chemical oxidation of potassium ferrocyanide in aqueous sulfuric acid solutions, with particular attention to the roles of hydrogen peroxide and hydroxyl radicals formed during water radiolysis. Nonirradiation kinetic experiments showed that oxidatio…
The note studies consistent estimation of the conditional expectation of an unknown random parameter given an observation in Robbins’ empirical Bayes scheme, when the prior distribution of the parameter is unknown. It proves a positive result for compact parameter sets and continuous sampling densit…
This paper proposes that the optical and ultraviolet luminescence of chromospheric flares may be powered by ionization losses of fast particles produced during solar flares. Using order of magnitude flare parameters, the author estimates energy deposition by energetic protons in hydrogen and compare…
This paper studies special structural spaces associated with rings and special classes of prime rings, using the corresponding special radical and the topology on special ideals. It establishes criteria for bicompactness of the structural space, including finite generation conditions on ideals and a…
This paper addresses the quantitative analysis of diamines and two component diamine mixtures, important starting materials for heterochain polyamides, using potentiometric titration in nonaqueous media. The authors examine several solvents and identify chloroform acetonitrile in a 4:1 ratio as a su…
An approximate method is developed for determining the front shape and parameters of a shock wave produced by a point explosion in an inhomogeneous ideal medium. The paper formulates the dimensional dependencies, derives a first-order nonlinear equation for the evolving shock front from the normal s…
This paper reports the preparation of a previously undescribed tetrahydrofuran complex of methyltitanium trichloride and examines its composition, stability, solubility, and decomposition behavior. The compound, obtained by low-temperature interaction of methyltitanium trichloride in hexane with pur…
This study examines how elastic mechanical deformation affects the electrical conductivity of thermally treated polyacrylonitrile fibers, interpreted as a semiconducting polymer with conducting conjugated regions separated by potential barriers. Using probe resistance measurements on individual fibe…
The paper examines the generality of nitrile-forming rearrangements in hydrazones and related oxime derivatives, emphasizing reactions involving cleavage of N,N or N,O bonds under acidic, Lewis acidic, quaternizing, or basic conditions. Using substituted hydrazones of aldehydes, pyrazoline analogies…
This study examines cathodic concentration polarization in molten oxide slags using a rotating iron disk electrode to control convective diffusion at 1300 to 1470 °C. Polarization curves for calcium silicate alumina and calcium aluminate slags with added iron oxides showed reduction waves whose limi…
This paper studies generalized solutions of second order elliptic equations in divergence form with measurable coefficients that may degenerate, together with lower order drift terms satisfying integrability and sign conditions. Using Moser’s iteration method and weighted embedding estimates, it der…
The paper addresses whether an operator in Kühne’s class of bounded J-self-adjoint operators must be completely continuous when one of its powers is completely continuous. It constructs, in a Hilbert space with both positive and negative J-metric subspaces infinite-dimensional, a J-positive operator…
This note studies continuous dependence on initial data for the first boundary-value problem for a parabolic equation considered backward in time, a problem known to be ill posed in general. Under uniform boundedness assumptions on solutions, it derives quantitative stability estimates for the diffe…
This study examines the thermal stability and decomposition behavior of high-purity potassium aluminum hydride prepared from potassium, aluminum, and hydrogen. Using differential thermal analysis combined with measurement of evolved hydrogen under argon, the authors identify three endothermic decomp…
This study examines association phenomena in solutions of ortho-regular phenol-formaldehyde novolac resins, focusing on the role of intra- and intermolecular hydrogen bonding. Infrared spectra of dilute resin solutions and model dioxydiphenylmethanes in carbon tetrachloride were recorded at varying …
This study examines how tensile loading affects the supramolecular structure of oriented crystallizing polymers, chiefly using small-angle X-ray scattering on highly oriented polycaprolactam films, with supporting observations on fibers and polyethylene films. Loading shifts the meridional small-ang…
This study examines how conjugation affects the infrared absorption intensities of the symmetric and antisymmetric valence vibrations of nitro groups in a broad series of more than 50 nitro compounds. Integrated intensities measured in chloroform solution show that the symmetric vibration polarized …
The paper studies two free-boundary gluing problems for plane hydrodynamic flows in which harmonic and constant-vorticity regions are joined across an unknown curve with continuous first derivatives of the stream function. For the first problem, the gluing curve is characterized by an integral equat…
This paper studies Urysohn integral operators acting on spaces of continuous vector functions over a bounded closed subset of finite-dimensional Euclidean space. It derives necessary conditions from boundedness and compactness, including weak continuity and integral boundedness and equicontinuity re…
This note studies spectral properties of bounded symmetric operators generated by higher order systems of differential equations of S. L. Sobolev type in Hilbert spaces of solenoidal vectors and associated function spaces. It defines the operators through elliptic boundary value problems with consta…
This paper examines the mechanism by which small additions of alkali metals modify aluminum, silicon silumin alloys, focusing on aluminum, silicon, lithium alloys as an analogue for sodium-modified silumin. Using microstructural and microanalytical observations, it compares lithium modification with…
The paper constructs scales of Orlicz spaces by defining intermediate N-functions through geometric interpolation of inverse complementary functions, and studies their ordering, equivalence, and preservation of growth conditions such as the Delta2 condition. It proves that the resulting spaces are d…
The paper studies constructive characterization of classes of bounded continuous real-valued functions on an arbitrary separable metric space in terms of uniform approximation by functions satisfying a Bernstein-type Lipschitz inequality. It defines best approximations by such generalized entire fun…
