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 the phase composition and structure of alloys in the molybdenum, nickel, boron ternary system containing up to 50 atomic percent boron. Cast and, for molybdenum and boron rich compositions, sintered alloys were annealed at 1000°C and analyzed by X-ray diffraction, microscopy, ele…
This study examines Fischer-Tropsch synthesis from carbon monoxide and hydrogen over talc-supported iron catalysts containing unusually low iron concentrations, from 0.1 to 10 wt. %. Because the reaction gives a multicomponent product mixture and lacks a simple kinetic equation, the authors estimate…
This paper describes the installation and testing of a quantum paramagnetic amplifier on the 22 meter radio telescope of the Lebedev Physical Institute for observations of the 21 cm neutral hydrogen line. The authors outline the radiometer configuration, including antenna to load switching, cryogeni…
The paper addresses deviations from the inverse-distance surface brightness law observed in the carbon coma of Comet Burnham 1959, especially in measurements of the C2 band near 5165 Å. It develops a first-approximation coma model in which luminous molecules are emitted from a point source, move und…
Electron paramagnetic resonance was used to study liquid and frozen acid solutions containing pentavalent chromium oxychloride, oxyfluoride, and oxosulfate complexes at temperatures from 295 to 77 K. The spectra are interpreted with isotropic and axial spin Hamiltonians, giving characteristic g valu…
This study examines sparingly soluble titanium compounds as mineral ion exchangers with potential advantages over organic resins in thermal and radiation stability. The authors synthesized several titanyl phosphates, hydroarsenate, chromate, molybdate and tungstate adsorption compounds, metatitanic …
This paper develops an analytical treatment of nonstationary convective diffusion to a rotating disk electrode, addressing limitations of earlier successive approximation and diffusion layer approaches for following the approach to steady state. Starting from the transport equation with Levich’s nea…
This paper examines the use of positronium annihilation measurements to determine rate constants for very fast reactions of positronium with inorganic ions in aqueous solution. Positronium lifetimes were measured by delayed gamma coincidence methods for solutions containing ions of differing valence…
The paper studies free algebraic groups and free abelian groups generated by a space equipped with a system of pseudometrics, with emphasis on how left-invariant and invariant group topologies affect dimension. It constructs maximal compatible left-invariant and invariant pseudometrics extending a g…
This study reexamines reactions previously assigned to alkylidene-bis-ethyleneimine formation from ethyleneimine and 1,3-dicarbonyl compounds. Using NMR, mass, and IR spectroscopy, the authors show that the products from acetylacetone and acetoacetic ester are instead beta-aminoethylethyleneimine de…
This note describes a construction of finite automata with growing memory that are asymptotically optimal in arbitrary stationary random environments, and studies zero-sum games between two automata of this type. The analysis expresses play probabilities through the induced Markov chain and uses asy…
This paper examines how ionogenic groups influence conformational transformations of gelatin molecules in solution, focusing on the dependence of optical rotation on pH, ionic strength, temperature, and renaturation time. Using dilute purified gelatin solutions, the authors measured specific optical…
This paper develops a theory of molecular vibrational excitation by atom collisions within the impulse approximation, treating the interaction as a sum of pair potentials between the incident particle and atoms in the molecule. General expressions are derived for vibrational-rotational transition cr…
This study examines homomolecular oxygen isotope exchange on gamma alumina and its relation to isotopic exchange between molecular oxygen and oxide oxygen. Using a static circulating method with mass spectrometric analysis, the authors measured exchange rates after different thermal evacuation and o…
This study examines how melting affects the secondary-electron emission and complete energy spectra of high-purity tin and indium under electron bombardment. Using a vacuum apparatus with simultaneous high-speed oscillographic recording of integral current-voltage characteristics and differential en…
This paper studies the stationary diffraction of a plane wave by a finite segment with a Neumann boundary condition, focusing on the far-zone diffracted amplitude in the high-frequency limit. The amplitude is represented as a sum over optical paths involving successive diffractions at the segment en…
The study examines the homogeneous palladium-catalyzed reduction of several quinones by carbon monoxide in aqueous dioxane, focusing on how quinone structure, oxidation-reduction potential, acid concentration, chloride complexation, and solvent composition affect reaction kinetics. Using H2PdCl4 as …
This paper studies metric distortion for plane topological univalent mappings of bounded domains whose coordinate functions, together with those of the inverse mapping, belong to a Sobolev-type class with bounded Dirichlet integral. Using the Carathéodory compactification by prime ends and the relat…
This note reformulates the general Kurosh and Amitsur theory of radicals of associative rings in terms of modules and representations. It introduces general classes of modules, defines the corresponding module-theoretic radical as the intersection of annihilators, and proves standard radical propert…
This note develops a stationary formulation of abstract scattering theory for self-adjoint operators, initially under a nuclear perturbation assumption. Using boundary values of resolvents and differentiability properties of spectral measures, it derives integral representations for wave operators a…
The paper addresses the design of a gamma ray quantometer whose sensitivity remains nearly constant at photon endpoint energies well below the range for which earlier instruments were optimized. It analyzes integration errors in the transition curve and proposes a tandem multiplate ionization chambe…
This paper studies elliptic and more general boundary value problems in which different boundary conditions are imposed on different parts of a smooth boundary, meeting along lower dimensional transition surfaces. Using factorization conditions for the associated boundary symbols and systems of pair…
This paper examines how plane phase discontinuities in an optical wavefront, although not predicted to be visible by geometrical shadow theory, appear in shadow photographs because of diffraction. A diffraction model is developed for a shadow instrument with a slit source and Foucault knife edge, yi…
The paper investigates whether uniqueness properties of analytic functions, known for limits of uniformly convergent analytic sequences in domains, can be extended to closures of analytic functions on nowhere dense closed sets. It constructs Cantor-type bounded closed sets by iteratively removing ce…
This paper reports the synthesis of bis-(triethylgermyl)-cadmium as a new bimetallic organogermanium compound, obtained by reacting triethylgermane with diethylcadmium under mild heating with liberation of ethane. Its proposed structure is supported by thermal decomposition to cadmium and hexaethyld…
This paper extends regularization methods for linear ill-posed integral equations of the first kind to a class of nonlinear equations, with motivation including inverse problems such as gravimetry. It introduces a smoothing functional combining the squared residual in the data space with a weighted …
This study examines the formation and properties of 1,1-dichloro- and 1,1-dimethyl-1-germanacyclopentene-3 obtained from trichlorogermane and divinyl, with attention to accompanying dimeric and polymeric organogermanium products. The authors characterize the monomeric, oligomeric, and polymeric comp…
The study examines the mutual influence of the cyclopentadiene and cyclopropane rings in spiro-(2,4)-heptadiene-1,3, with spiro-(4,4)-nonadiene-1,3 used as a comparison compound lacking a three-membered ring capable of similar interaction. Raman and infrared spectra were used to confirm the proposed…
This paper examines the alkaloid composition of Ungernia severtzovii collected from several localities and plant organs, using solvent extraction, salt formation, alumina chromatography, melting point comparison, elemental analysis, optical rotation, infrared spectra, and chemical transformations. T…
This paper examines how aryl substituents and amine structure affect nucleophilic substitution at boron in reactions of diarylboron chlorides with ammonia and primary amines. Experiments with di-o-tolylboron chloride and di-p-tolylboron chloride show that the ortho-tolyl compound gives aminodiarylbo…
This study investigates the mechanism of polymer fracture by detecting free radicals formed during uniaxial tensile loading of highly oriented polycaprolactam fibers using electron paramagnetic resonance. Experiments on unstabilized fibers and fibers containing di-beta-naphthyl-p-phenylenediamine sh…
This study examines the coprecipitation of trace thallium(I), labeled with Tl-204, with sparingly soluble zinc, cobalt, and cadmium tetrathiocyanatomercurates in order to assess how the outer-sphere cation affects impurity capture by precipitates containing complex anions. Capture isotherms and radi…
The paper studies transitive-differential transformation groups through their associated graded Lie algebras of polynomial vector fields and formulates irreducibility in terms of invariant subspaces of the underlying vector space. It proves that irreducible algebras can have order at most two, relat…
The note generalizes a theorem of E. M. Landis on the possible rate of decrease of solutions of elliptic equations in a half-strip. It shows that for a self-adjoint second-order elliptic equation in divergence form, the same lower bound on decay holds under minimal assumptions: the leading coefficie…
This study examines the initial stages of the thermal transformation of polyacrylonitrile and the formation of conjugated structures associated with its emerging semiconducting properties. Polyacrylonitrile films were heat treated under high vacuum and monitored by ultraviolet, visible, and infrared…
This paper reports the synthesis and characterization of the isomeric organogermanium olefins 1,1- and 1,2-bis(trimethylgermyl)ethylene, prepared to compare germanium analogues with previously studied silicon compounds showing unusual optical and spectroscopic behavior. The authors obtained the targ…
The study examines the condensation of acid chlorides of ethylene, propylene, and butyleneglycolphosphorous acids with alpha,beta-unsaturated ketones, specifically methyl vinyl ketone and mesityl oxide. The reactions were carried out in sealed tubes with heating, and the products were characterized …
This paper refines earlier structural data for synthetic sodium zeolite Zh by excluding weak X-ray lines attributed to crystalline impurities and recalculating the cubic lattice parameters. The revised Debyegram analysis gives a lattice constant of 8.88 ± 0.04 Å and indicates a sodalite-type framewo…
This paper examines how to determine the direction and relative irreversibility of exchange reactions in molten reciprocal salt systems. Using the Gibbs Helmholtz relation, with corrections for heating, melting, crystallization, heat capacities, and polymorphic transformations, the author calculates…
This paper investigates whether water can influence the crystallization and stability fields of dense silica modifications under high pressure, motivated by earlier observations of solvent effects on phase formation. Experiments on silicon dioxide in the presence of water produced the rutile-structu…
The paper develops an electrochemical description of metal corrosion in molten salts, treating the stationary potential as the condition where the metal ion equilibrium potential equals the redox potential of the adjacent melt. From diffusion conditions, it derives relations connecting stationary po…
The paper studies the global Cauchy problem in a half-space for a first-order nonlinear equation with several spatial variables, under convexity assumptions on the dependence of the flux on the spatial gradient and Lipschitz bounded initial data. It defines a generalized solution satisfying Lipschit…
This study examines how paramagnetic polymers influence the low-temperature pyrolysis of anthracene and bianthryl at 450 degrees C, with attention to gas evolution, formation of paramagnetic particles, and soluble and insoluble residues. Using sealed-ampoule pyrolysis, mass-spectrometric gas analysi…
This paper studies the large eigenvalue asymptotics of the discrete spectrum for the boundary value problem \(w''(x)-\lambda^2 p(x)w(x)=0\), \(w(\pm\infty)=0\), where \(p\) is first a polynomial and then an entire function. The method continues the asymptotics of a solution decaying at \(+\infty\) i…
This study examines how macromolecular rigidity influences transition temperatures and crystalline morphology in triethylcellulose, a rigid-chain cellulose ether. Using thermomechanical testing, X-ray diffraction, electron microscopy, and optical microscopy, the authors distinguish two reproducible …
This paper analyzes stationary plane and axially symmetric flows of an inviscid, non-heat-conducting, compressible conducting fluid across a magnetic field within magnetohydrodynamics. It derives systems of equations for flows whose stream surfaces coincide with electric equipotential surfaces, incl…
This study uses electron paramagnetic resonance to examine radiation-induced lattice defects in calcium, strontium, and barium sulfates containing radioactive sulfur or exposed to cobalt-60 gamma irradiation. Measurements on evacuated powders at room and liquid-nitrogen temperatures, followed by con…
