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 studies transformation operators for Sturm-Liouville differential equations on the positive half-line in the non-self-adjoint case, allowing complex potentials and boundary parameters. Under the integrability condition that the first moment of the potential is finite, it uses the principa…
This note studies bounded classical solutions of parabolic boundary-value problems in infinite time cylinders, without prescribed initial conditions. Using a method adapted from elliptic theory and maximum principles, it proves existence and uniqueness results for linear Dirichlet and Neumann proble…
This paper investigates the fluorination of uranium tetrafluoride by chlorine trifluoride between 18 and 300°C, using chemical and X-ray phase analysis of solid residues and uranium hexafluoride yield as indicators of reaction progress. The authors identify distinct temperature-dependent regimes: di…
The paper develops a class of weighted Sobolev type spaces in Euclidean space defined by radial differential operators, including fractional radial derivatives, with weights determined by distance from a point or submanifold. It proves embedding and norm equivalence results showing that lower order …
This study examines how monomer concentration and conversion affect the molecular weight and molecular weight distribution of stereoregular cis-1,4-polybutadiene formed in benzene solution using soluble cobalt complex catalysts with diisobutylaluminum chloride. Molecular weight distributions were de…
This paper examines the preparation of 2-arylindan-1-ol-3-ones by selective catalytic hydrogenation of readily available 2-arylindandione-1,3 derivatives, motivated by the physiological importance of related anticoagulant indandiones. Hydrogenation of 2-phenylindandione-1,3 in ethanol at room temper…
The study quantitatively investigates the kinetics of aquation of dissolved monofluorophosphate ion in neutral, alkaline, and strongly acidic media. Using phosphate determinations on sealed, thermostatted samples, the authors show that hydrolysis follows the stoichiometry yielding orthophosphate and…
The paper studies Green’s functions for arbitrary positive powers of elliptic operators associated with strongly continuous semigroups generated by parabolic Green kernels under boundary conditions. It defines negative fractional powers by semigroup integrals, derives integral kernel representations…
This paper reports experimental results on inelastic proton-neutron interactions at 9 BeV, based on 236 selected events recorded in nuclear emulsion exposed to the internal proton beam of the Joint Institute for Nuclear Research synchrophasotron. The authors analyze charged-particle multiplicities, …
This paper examines thermogalvanic corrosion of metals under temperature gradients, addressing the conventional assumption that the heated region of a metal surface necessarily becomes anodic and therefore corrodes preferentially. Model thermogalvanic cells with separated hot and cold electrodes wer…
This note develops an algebraic approach to periodic and limit-periodic generalized Jacobi matrices, using commutation relations and operator-theoretic spectral arguments. It proves that commuting generalized Jacobi matrices satisfy an algebraic relation, and in the complex-symmetric periodic case d…
This paper reports an experimental electron paramagnetic resonance study of benzyl radicals generated by low-temperature photolysis of benzyl chloride adsorbed on degassed silica gel. The observed spectrum is interpreted as a triplet, with a splitting of about 16.5 Oe from the methylene protons, eac…
A theory is developed for the small-signal kinetics of minority carriers in the base region of a p-n junction containing trapping levels with arbitrary capture cross section and binding energy. Solving coupled diffusion, recombination, trapping, and thermal release equations, the paper derives the c…
This study examines how dispersity changes during hydration of beta dicalcium silicate and tricalcium silicate and how these changes relate to structure formation in concentrated pastes with quartz sand. Using low temperature nitrogen adsorption, bound water measurements, and plastic strength tests,…
This paper calculates spin density distributions in potassium ketyls of benzophenone, benzil, and fluorenone using a simple LCAO molecular orbital method. Ketyl formation is treated as electron transfer from the metal to the lowest vacant ketone orbital, with oxygen included through adjustable Coulo…
This study investigates the role of free radicals in the oxidation of 2,4,6-tri-tert-butylphenol by oxygen in the presence of homogeneous copper amine complex catalysts. Using electron paramagnetic resonance, the authors detect 2,4,6-tri-tert-butylphenoxyl radicals during oxidation and compare the b…
This study examines how the equilibrium state of the intermetallic compound MnNi3 affects creep resistance relative to a quenched solid solution of the same stoichiometric composition. Alloys were prepared from nickel and manganese, homogenized and quenched to retain the solid solution, or annealed …
This study examines how additions of 1 to 3 percent aluminum affect the stability and decomposition of the quenched beta phase in titanium, molybdenum, iron alloys. Alloys were prepared by vacuum arc melting, quenched from selected temperatures, aged between 200 and 600 degrees, and analyzed by micr…
The paper examines the formation of collisionless shock waves in rarefied plasma when no strong transverse magnetic field is present, focusing on the role of velocity-space anisotropy rather than beam instability. Using the linearized kinetic and Maxwell equations, the authors derive conditions for …
The paper examines the kinetics of anodic oxidation of niobium in 1 N solutions of sulfuric, phosphoric, nitric, and hydrochloric acids, focusing on the relation between current density, oxide film growth, and electrode potential. Using constant-current polarization measurements, the authors analyze…
The paper proposes magnetohydrodynamic vortices as a possible mechanism for solar ejections, including active and eruptive prominences and flares. Drawing on laboratory experiments with toroidal plasma vortices and jets, it describes their stability, plasmoid formation, magnetic-field structure, vel…
This paper develops a quantitative theory for direct current passage through an immobile solution of a symmetric binary electrolyte in a capillary, without assuming a prior separation into an electroneutral diffusion region and a Gouy diffuse layer. Starting from diffusion kinetic equations coupled …
This paper examines anomalous dispersion of birefringence near a narrow, strongly polarized absorption line in europium chloride hexahydrate crystals. It develops and applies an optical method using a Babinet compensator, crossed Nicols, and spectrographic recording to measure the displacement of in…
This study examines complex formation in tartaric acid solutions for Ti, Cr, Mn, Fe, Co, Ni, and Cu, with the aim of assessing ion exchange as a tool for characterizing metal species and improving separations. Distribution coefficients and sorption percentages were measured under static conditions o…
This paper reports experimental determinations of the enthalpy and heat capacity of tungsten over an extended high-temperature range up to 2400 degrees Celsius, addressing discrepancies and limited coverage in earlier measurements. Using the mixing method with polished powder-metallurgy tungsten sam…
This paper develops a theory of alpha decay within the nuclear superfluid model, focusing on how superconducting-type pair correlations of protons and neutrons affect decay probabilities and hindrance factors. Using quasiparticle wave functions and an averaged alpha-formation operator, it derives ma…
This study evaluates thiogin, the hydrochloride salt of the mixed thiosemicarbazone guanilhydrazone of indandione-1,3, as a representative of a proposed new class of antituberculosis agents active against drug-resistant mycobacteria. Using in vitro serial dilution assays and in vivo experiments in g…
This paper investigates inorganic model systems for the Hill reaction, replacing chlorophyll with semiconductor photocatalysts to study light-driven reduction of ferric compounds coupled to oxygen evolution from water. Suspensions of titanium dioxide, zinc oxide, and tungstic acid were illuminated i…
This paper investigates the reversible photochemical reduction of polymethine thiacarbocyanine dyes in pyridine solutions using ascorbic acid and cysteine as reducing agents. By monitoring absorption changes under illumination and in darkness, the authors show that dyes with longer polymethine chain…
Tolstov proposes a highly general formal framework for differentiation and integration on an abstract space, defined through a linear correspondence between set functions and point functions satisfying positivity and normalization conditions. The paper derives basic properties of the resulting forma…
This study examines how preparation history affects the catalytic behavior of unsupported metallic nickel. Ten nickel catalysts produced by different routes were tested in flow experiments using cyclohexane dehydrogenation, isopropyl alcohol dehydrogenation, and tert-butyl alcohol dehydration, with …
This paper studies the onset of asymmetric deflection, or corrugation, in a circular plate that is rigidly supported and uniformly compressed along its boundary without transverse loading. The plate is formulated through the Kirchhoff equations and an associated energy functional, whose stationary p…
This paper develops computational procedures for double effusion cell mass spectrometry of vapors containing monomeric and associated molecules, aiming to obtain mass spectral coefficients, vapor composition, and dissociation energies from a single temperature series. The method uses the expected li…
A method is presented for solving statically indeterminate plane flow problems of ideally plastic bodies when the arrangement and number of plastic regions are known. The approach uses the velocity field on the characteristic plane to derive the missing stress boundary conditions, with Riemann’s for…
The paper studies how the growth of polynomials orthonormal on the unit circle with respect to a mass distribution depends on local and global properties of that distribution, especially the zeros of its density. It derives upper bounds in terms of the modulus of increase of the distribution and low…
This paper investigates the use of acetone for extracting technetium-99 from alkaline solutions, particularly those arising in the processing of neutron-irradiated molybdenum. The authors show that sodium hydroxide and sodium molybdate can salt out acetone from aqueous media, enabling phase separati…
This note develops spaces \(L_p^r(\Omega)\) with fractional order \(r\) for \(2 \le p n\), including estimates for first or second differences in the critical integer and noninteger cases.
This paper extends the Cauchy integral operator to suitable classes of generalized functions by introducing spaces of test functions, analytic test functions in a strip, and their continuous duals. It gives sufficient decay conditions under which a generalized function belongs to the relevant dual s…
This paper describes a thin-layer chromatographic method for separating carbohydrates and polyhydric alcohols on cellulose powder plates fixed with gypsum. The authors prepared stable cellulose layers, tested a series of alcohol, ester, water, pyridine, and ammonia solvent systems, and determined Rf…
This study examines whether phenolate groups in nitro-substituted diphenylmethane and diphenylethane systems can form colored donor-acceptor complexes analogous to those formed by amino donor groups. The authors synthesized hydroxy derivatives, converted them to sodium phenolate salts, and compared …
This paper examines whether the dielectric constant is a theoretically justified parameter for describing solvent effects on electronic spectra and intermolecular interactions in solutions. Critiquing continuum approaches based on the Onsager model, the authors argue that interactions between locali…
This study examines the origin of light-induced electron paramagnetic resonance signals observed in silver bromide powders sensitized with cyanine dyes, a question relevant to mechanisms of spectral sensitization. Using EPR measurements under illumination, vacuum, air, and low-temperature conditions…
The paper develops a kinetic description of homogeneous quasi-equilibrium turbulent processes in plasma when the intensity of plasma waves is too large for standard one-particle kinetic equations to be closed. Using equations for microscopic distribution fluctuations and field correlations, it deriv…
This paper studies uniqueness of an integral curve adjoining the origin for a first order differential equation in a normal Frommer domain of the second type. Under assumptions controlling the sign and growth of the principal term, the smallness of a perturbation, and a one sided Lipschitz type boun…
This paper develops a quantum mechanical treatment of heterogeneous electrochemical oxidation reduction reactions on metals for the case in which the inner coordination sphere of the reacting ion is assumed not to deform during electron transfer. Using a one particle approximation, continuum solvent…
This paper derives error estimates for finite difference solutions of the Dirichlet problem for the Poisson equation, addressing the lack of estimates analogous to those known for the Laplace equation. The argument decomposes the solution into a zero-boundary Poisson component and a harmonic compone…
This paper examines short-period train-type oscillations of the natural electric field in the sea, using stationary Black Sea observations from 1959 to 1961 together with expeditionary records from other seas. The study compares marine and coastal telluric measurements, characterizes amplitudes and …
This study examines how composition affects radiation-induced optical absorption in glasses of the Na2O, Al2O3, SiO2 system, where aluminum may function either as a network former or modifier. Glasses with varying Na2O and Al2O3 contents were gamma-irradiated, and difference absorption spectra were …
This paper studies boundary value problems for quasilinear elliptic systems in divergence form with nonlinear growth and subordinate lower order terms. Using Sobolev space formulations, Galerkin approximations, monotonicity type estimates, bicontinuity of the associated operator, and degree argument…
This study examines the interactions of tri-n-butyl phosphate with nitric acid and water, motivated by its use as an extractant in nitric acid media. Using physicochemical analysis, the authors measured density, viscosity, crystallization behavior, and mutual solubility in the binary systems tri-n-b…
