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 investigates the ion-exchange separation of rubidium and cesium using ammonium phosphotungstate, motivated by the need for selective, radiation-stable inorganic exchangers for chemically similar heavy alkali metals. The authors prepared a low-resistance chromatographic column by depositin…
This note studies the alternating direction method for finite difference systems approximating a class of self-adjoint elliptic boundary value problems of order higher than two in a rectangle. A finite difference scheme is formulated for a fourth-order model problem with homogeneous first boundary c…
This paper studies classes of convex N-functions arising in the theory of Orlicz spaces, focusing on Delta-type growth conditions and their characterization through complementary N-functions. It proves necessary and sufficient dual conditions for several such classes, including the Delta prime, Delt…
This paper describes the application of N,N′-dicyclohexylcarbodiimide to the synthesis of S-aminoacyl derivatives of cysteine peptides, considered as thiodepsipeptides because they contain a thioester linkage. The authors condense ethyl N-carbobenzoxy-L-cysteinylglycinate with carbobenzoxy-protected…
This paper examines why benzene interacts more strongly with hydroxylated oxide surfaces than would be expected from comparisons with nonpolar hydrocarbons. The authors model the interaction of a benzene molecule with an OH dipole using molecular orbitals that include both delocalized pi bonds and l…
This study examines the catalytic hydrogenation and ring opening of unsymmetrical alpha, beta, and gamma organic oxides in a flow system at 50 atm hydrogen pressure. Propylene oxide, alpha-methyltrimethylene oxide, alpha-methyltetrahydrofuran, and related substrates were hydrogenated over skeletal C…
The paper studies the complexity of realizing monotone Boolean functions of n variables by circuits of functional elements for conjunction and disjunction. It refines Shannon’s decomposition method by estimating the number of distinct monotone subfunctions that can actually arise after substituting …
The paper reports low-temperature spectroscopic observations of fine structure in the absorption and fluorescence spectra of metal-free phthalocyanine, magnesium phthalocyanine, and protoporphyrin in frozen normal paraffin solutions at 77 K, using Shpol’skii-type conditions. Photographic spectra sho…
This paper defines generalized Chebyshev line elements on a square using functions of bounded variation and an associated finitely additive curvature measure. It introduces the induced length of smooth curves and the resulting intrinsic metric space generated by such a line element. The main results…
This study tests whether metallic platinum exchanges with complex ions of divalent platinum in aqueous solution, a hypothesis proposed to explain the nonindifferent behavior of platinum electrodes in such media. Irradiated platinum foil containing Pt-197 was shaken with chloride and platinum complex…
This paper examines the mechanism by which imido esters rearrange to substituted amides in reactions with alkyl halides, a process previously proposed to involve unstable addition intermediates. The authors investigate iodide salts of aryl benzimido esters and show that, although heating alone does …
The paper reports a new synthesis of 19-nor-11-deoxycorticosterone acetate from strophanthidin, aiming to obtain a product with the configuration corresponding to natural 11-deoxycorticosterone. The authors describe conversion of the strophanthidin lactone ring to an alpha-ketol side chain by ozoniz…
This paper examines secular variations of magnetic declination over oceans and continents using long historical records from European observatories and compiled declination data for the Atlantic and Indian Oceans along selected latitudes. By constructing longitude-dependent curves of mean values, co…
This paper examines the synthesis of polymers containing charged heteroatoms in the main macromolecular chain, termed onium polymers, using 4-chloropyridine as a model monomer. Heating or storing purified 4-chloropyridine produced polychloropyridine, whose elemental composition, titratable ionic chl…
This paper develops a theoretical treatment of the coagulating action of mixtures of electrolytes on weakly charged lyophobic sols, focusing on the role of counterion adsorption. Using a Langmuir adsorption model, a linear relation between adsorption and the potential at the adsorption layer boundar…
The paper studies two existence problems for partial differential equations: mixed boundary-value problems for quasilinear parabolic systems with strongly elliptic spatial operators, and the Cauchy problem for linear hyperbolic equations of arbitrary order. For the parabolic case, a weak formulation…
This note studies nonnegative additive homogeneous functionals of standard Markov processes and their relation to representations of excessive functions as generalized potentials. It gives a necessary and sufficient condition for a finite excessive function to admit such a representation, extending …
This study examines the mechanism of radiation oxidation of benzene in aqueous solution, testing whether products arise through hydrogen abstraction to phenyl radicals or through addition of water radiolysis radicals to the benzene ring. Benzene was irradiated with cobalt-60 gamma radiation in heavy…
The paper examines diurnal and seasonal variations in the far field of long radio waves by treating the ionosphere as a slowly varying medium along the propagation path. Using an expansion in a small parameter, the field is represented as a spectrum of modulated normal waves, with simplified ionosph…
This study examines the mechanism of thermal decomposition of organic percarbonates in solution, focusing on the interaction of alkoxy radicals with solvents. Using the radical scavenger DPPH, carbon 14 labeling, deuterated isopropyl alcohol, and product analysis, the authors compare decomposition i…
This paper studies completeness of systems of the form \(z^{\tau_n}\log^j z\) on unbounded curves and in several types of domains in the complex plane, with weights and geometric conditions on the complement. The author derives sufficient conditions in weighted spaces of continuous functions and \(L…
This paper estimates how long photodissociation of water vapor by solar ultraviolet radiation could take to establish a stationary amount of free oxygen in a water-bearing planetary atmosphere, with particular reference to prebiotic Earth. Using a simplified isothermal atmospheric model, absorption …
This paper describes the synthesis of organotin and organolead esters of biologically significant nitrogen-containing acids, including alpha-alanine, p-aminobenzoic, nicotinic, isocinchomeronic, orotic, and uracilacetic acids. The authors prepare these compounds through reactions of organotin or org…
This paper describes a total synthesis of dl-8-isoestrone from the previously prepared methyl ether of 8,9-dehydro-D-homoestrone. The route proceeds through catalytic hydrogenation to the methyl ether of D-homo-8-isoestrone, condensation with furfural, alkaline hydrogen peroxide oxidation to a dicar…
This note generalizes an integral representation of one-variable divided differences to divided differences of order (m,n) for functions of two variables on a rectangular grid of nodes. Using repeated integration by parts over subrectangles, the author formulates a boundary-value problem for auxilia…
This paper reports a further oceanographic test of the hypothesis that telluric currents in seawater contribute substantially to the latitudinal component of the geomagnetic field and thereby to magnetic declination. The authors describe a deep-water instrument assembly combining a magnetic compass,…
This note studies an autonomous system of n differential equations with a small parameter in a neighborhood containing an equilibrium at the origin and a limit cycle, under spectral assumptions and a nondegeneracy condition on the cubic terms. Using a Poincare-type transformation on an (n minus 1)-d…
This paper extends Sobolev-type embedding theorems for abstract additive set functions with values in a Banach space. It introduces a broader class of normal completely additive set functions, defines corresponding spaces with shift-continuous generalized derivatives, and proves that such functions …
This paper studies finite systems of pairwise disjoint \((n-1)\)-dimensional spheres embedded in an \(n\)-dimensional sphere and asks when such systems can be simplified by isotopy. Using consequences of Brown’s results on normally embedded spheres, it proves that if each sphere is normally embedded…
This paper studies a linear conjugation boundary value problem for analytic functions on domains separated by closed contours, with boundary data involving both a function and its complex conjugate. Using reductions to singular integral equations and comparison with the Riemann problem, it gives sol…
This study examines the contact transformations of cyclooctane over a nickel on kieselguhr catalyst in a hydrogen stream at 200 and 250 degrees C. The reaction products were separated by fractionation and identified mainly by Raman spectroscopy, allowing comparison of conversion pathways at the two …
This study examines the hydration and adsorption properties of anatase titanium dioxide surfaces subjected to different thermal treatments. Using volumetric adsorption measurements of water and nitrogen vapor, BET surface area determination, and quantification of water released on ignition, the auth…
This study determines diffusion coefficients of several metal and network-forming ions in molten aluminate and silicate slags using concentration polarization during cathodic deposition and oscillographic measurement of the transition time to limiting concentration at the cathode. Measurements for F…
This study examines how radioactive calcium-45 affects the catalytic dehydration of cyclohexanol over mixed magnesium sulfate and calcium chloride catalysts, in comparison with earlier results for sulfur-35. Catalysts containing varied proportions of calcium chloride were prepared with and without r…
This paper describes the use of neutron activation analysis for determining tungsten in minerals and beneficiation products, especially scheelite concentrates. The authors irradiate samples with a polonium beryllium neutron source, measure beta activity from the induced isotope W187, and use calibra…
This study examines how preparation conditions affect the fine structure of low-temperature absorption spectra in polycrystalline cadmium sulfide films. CdS films of varied thickness were deposited in vacuum, argon, or hydrogen sulfide on substrates with different preheating temperatures, and their …
This paper examines how the dispersity of solid emulsifier particles relates to the stability and droplet size of oil-in-water emulsions. Using a modified shear-measurement apparatus, the authors measured the limiting two-dimensional shear stress of protective interfacial particle layers and compare…
This paper examines the stability of a thick rectangular simply supported plate subjected to a uniformly distributed compressive load on two opposite sides. Starting from three-dimensional elasticity and small elastic-plastic deformation relations, without using Kirchhoff-Love hypotheses, it derives…
This paper develops and justifies an averaging method for singularly perturbed systems in which slow variables are coupled to fast variables whose unperturbed motion is explicitly solvable. It constructs formal near-identity transformations leading to averaged systems of arbitrary order, and proves …
This paper examines how solution concentration affects the conformation of polymethacrylic acid chains in water, motivated by a reversal in the temperature dependence of viscosity between dilute and concentrated solutions. Viscosity measurements using a rotational viscometer at concentrations of 6, …
This study examines the low-temperature alkylation of naphthalene with propylene at atmospheric pressure over an industrial aluminosilicate catalyst, with attention to minimizing side reactions and determining the isomeric composition of the products. Experiments varied temperature and naphthalene t…
This study examines the redox potential of the Ti2+/Ti3+ system and the equilibrium constant for the reaction between trivalent titanium and metallic titanium in molten chloride salts. The authors compare hydrogen potentiometric titration with titration using metallic titanium in molten sodium and p…
This paper estimates the probability that vibrationally excited oxygen loses one vibrational quantum in collisions with nitrogen dioxide, using flash photolysis data in which oxygen is formed at high vibrational levels and the decay of the sixth level population is observed. A kinetic model for rela…
This study applies electron diffraction to oriented films of poly-gamma-methyl-L-glutamate, a synthetic polypeptide used as a model for protein secondary structure. Diffraction patterns from stretched specimens were indexed with a hexagonal cell close to that known from X-ray work and showed feature…
This paper investigates the catalytic hydrogenation of phenylglyoxylic and alpha-naphthylglyoxylic acids over colloidal palladium protected by gum arabic, with attention to implications for asymmetric catalysis and the structure of dissymmetric colloidal catalysts. Kinetic measurements in aqueous al…
The paper studies time-periodic solutions of boundary-value problems without initial conditions for second-order parabolic equations. For Dirichlet problems with time-independent elliptic part, the solution is expanded in a Fourier series in time, reducing the problem to elliptic boundary-value syst…
This paper reexamines the structure of sabinene monohydrochloride, for which earlier literature proposed conflicting formulas. The authors report that hydrochlorination of sabinene in dry petroleum ether with hydrogen chloride at about minus 30 to minus 40 degrees gives the monohydrochloride in near…
The paper develops a generalized Frommer method for studying first order differential equations whose coefficients need not be analytic, focusing on characteristics entering the origin from the right and on the smallness order of solutions vanishing there. It introduces comparison notions for orders…
The paper studies the long time behavior of solutions to a one dimensional reaction diffusion Cauchy problem arising in combustion theory, under structural assumptions on the nonlinear term and on the initial data. Using maximum principles, comparison arguments, Bernstein type estimates, and auxilia…
This paper studies coefficient estimates for analytic functions of two complex variables in bounded complete bicircular domains and in bicylinders, under the condition that no product of two function values equals one. Using Temlyakov’s integral representation and boundary value arguments for an ass…
