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 study investigates the water-insoluble precipitate formed during gamma-radiolytic oxidation of benzene in degassed aqueous solution, a product previously often assumed to be diphenyl. The authors isolated the precipitate by centrifugation and washing, then examined it by ultraviolet and infrare…
Independently of any theory of the origin of the universe, one may attempt to find indications of the nature of the last nuclear reaction that occurred immediately before the final establishment of the abundance distribution observed at the present time. Going back into the past, one may try to dete…
A method is proposed for estimating an apparent or conditional coefficient of thermal diffusivity for use in similarity modeling of atmospheric heat transfer. The paper represents heat removal from a heated circular island or model region either as periodic replacement of the overlying fluid or as u…
This paper examines how stable intermediate products can alter the kinetics of complex chain reactions, especially hydrocarbon oxidation, beyond the established mechanism of degenerate branching. Using illustrative reaction schemes and steady-state treatment of radical concentrations, it derives rat…
This paper proposes a method for determining the specific surface area of adsorbents from gas adsorption measurements in the monomolecular region, where conventional B.E.T. and Harkins and Jura methods may be unreliable for finely porous materials. Nitrogen adsorption at 77.4 K on silica gel and alu…
This paper investigates whether the hypothetical higher oxide CO3 is formed during carbon monoxide combustion in oxygen, a question relevant to proposed mechanisms of dry CO oxidation. Using infrared emission spectroscopy of a CO diffusion flame with dried gases and controlled oxygen, nitrogen, and …
This paper develops a theory of long-range interactions between evaporating or growing aerosol droplets, extending an earlier isothermal diffusion treatment by including heat transfer accompanying phase transitions. Using linearized hydrodynamic, diffusion, and thermal equations with quasi-stationar…
This study examines how temperature and prolonged constant shear loads affect the elastic, recoverable, and viscoplastic behavior of thermosetting plastics based on phenol-formaldehyde and aniline-formaldehyde resins. Cylindrical molded specimens were tested under controlled stresses, temperatures, …
This study examines how dipolar ions, represented by amino acids and peptides, are sorbed by ion-exchange resins, emphasizing that their simultaneous positive and negative charges produce behavior different from that of ordinary ions. Dynamic sorption experiments with sulfonic and carboxylic resins …
This paper studies the curvature tensor of spaces with a symmetric almost symplectic connection and derives additional identities specific to this setting. It characterizes spaces whose holonomy algebra elements associated with elementary cycles lie in the symplectic algebra, showing their equivalen…
This study examines the preparation and properties of lanthanum sulfides, motivated by contradictory reports on lanthanum sesquisulfide and by analogy with lower cerium sulfides. Lanthanum sesquisulfide was produced from lanthanum chloride by sulfidation with dry hydrogen sulfide, then heated in hig…
This study examines amino, imino tautomerism in acylated derivatives of 2-aminopyridine and 2-aminothiazole, interpreting the equilibrium as an acid, base process influenced by the basicities of ring and exocyclic nitrogen atoms. Infrared and ultraviolet spectra of compounds bearing acyl, sulfonyl, …
This paper studies representations of natural numbers in the form n equals p plus a power of a fixed integer a, where p is prime and the exponent is nonnegative. Using a counting function for such representations and Romanov’s identity relating its second moment to prime differences and differences …
This paper examines the structural interpretation of organochromium compounds obtained from reactions of phenylmagnesium bromide with chromic chloride, particularly whether Hein’s polyphenylchromium derivatives are better described as di, pi arene chromium salts. The authors assess earlier reduction…
This note establishes a general dimension estimate for spaces of automorphic forms associated with certain discrete groups acting on bounded domains in several complex variables. It introduces Siegel domains of the first and second kinds, describes their relation to irreducible bounded symmetric dom…
This paper examines the formation of arylsulfonic acid anhydrides during reactions of arylsulfonic acids and their sodium salts with inorganic acid chlorides, including phosphorus pentachloride, phosphorus oxychloride, phosphorus trichloride, thionyl chloride, and chlorosulfonic acid. Experimental c…
This study examines products formed during electroreduction of gramicidin C, with the aim of testing earlier indirect evidence for a diketopiperazine ring involving proline and phenylalanine. Electrophoretically homogeneous gramicidin C was reduced, hydrolyzed, and analyzed by paper chromatography, …
This study examines the addition of trichlorosilane, tribromosilane, and methyldichlorosilane to selected olefinic hydrocarbons containing terminal or branched double bonds, using benzoyl peroxide as initiator. Reactions with 1-nonene and 1-decene gave alkyltrihalosilanes in comparatively high yield…
This paper reports reconnaissance measurements of natural electric currents in the Indian Ocean and adjacent Antarctic waters during the 1955 to 1956 Antarctic expedition aboard the Ob’. Using lead electrodes deployed along horizontal and vertical baselines, the study determined potential gradients,…
The paper studies the epsilon entropy and epsilon capacity of several classes of analytic and entire functions, measured by the uniform metric on a real interval. It establishes asymptotic estimates for functions bounded in a strip, for entire functions with prescribed exponential growth, and for en…
This paper reports the synthesis of organosilicon compounds containing silthianocarbon chain units, intended for comparison with previously described siloxanocarbon and silazanocarbon analogues. Pentaalkyl bromodisilanylmethanes were treated with hydrogen sulfide in the presence of pyridine, or with…
The paper studies summation of analytic functions in the classes defined by bounded higher derivatives in the unit disk, extending earlier results of Stechkin on Taylor sums and Fejér means. It proves a representation theorem for a broad class of regular triangular Toeplitz summation methods, using …
This paper develops a group-theoretical apparatus for relating ordinary Minkowski space to isotopic space by treating isotopic spin and charge-group invariants as internal degrees of freedom in generalized first-order wave equations. It classifies equations invariant under rotations, reflections, an…
This paper examines water adsorption on low-temperature alpha quartz surfaces produced by crushing rock crystal under high vacuum, a method intended to create silica surfaces free of hydroxyl groups without high-temperature calcination. Adsorption isotherms measured volumetrically at 18 degrees are …
This paper treats diffraction of an obliquely incident plane sound wave by a thin finite elastic cylindrical shell hinged into a rigid cylindrical screen. Using Green’s theorem, radiation conditions, and equality of normal velocities at the fluid, shell boundary, the acoustic field is represented by…
This paper describes a simple oscilloscope method for observing the increased magnetic viscosity of ferrites at low temperatures. A toroidal ferrite specimen with high initial permeability is fitted with magnetizing and measuring windings, and its hysteresis loops are compared at room temperature an…
This study examines catalytic hydrogenation of vinylcyclopropane and 1-methyl-1-isohexenylcyclopropane to assess how the position of a side-chain double bond affects cleavage of the cyclopropane ring. Hydrogenation experiments with palladium black, platinum black, copper-chromium catalyst, and plati…
This paper develops a field-theoretic method for computing equilibrium quantum distribution functions for a one-component nonrelativistic Bose gas with pair interactions. The generating functional of the distribution functions is transformed by a Gaussian auxiliary field, reducing the interacting pr…
This paper establishes criteria under which systems of analytic functions of the form \(z^n\varphi_n(z)\) constitute a basis for holomorphic functions in a disk or related simply connected domain. The authors express the factors through analytic logarithms, derive coefficient recursions for formal e…
This paper examines whether nearby supernova explosions could have significantly altered the cosmic ray environment of Earth and thereby influenced biological evolution. Using radio astronomical evidence for relativistic particles in supernova remnants, the authors estimate that the Solar System may…
This study examines the visible absorption spectra of seven solid tetravalent uranium compounds at liquid nitrogen temperature, with the aim of assessing whether their spectral structure can be interpreted in terms of 5f electron transitions analogous to those in lanthanoid compounds. Low-temperatur…
This paper examines the thermodynamic basis for differences in the polymerization behavior of cyclic formals with five to eight ring members. The authors determine heats of combustion for ethylene, trimethylene, tetramethylene, and pentamethylene formals, use estimated heats of vaporization to refer…
This paper reconsiders the equation for nonstationary diffusion to a stationary electrode, noting that the usual Cottrell-type boundary conditions do not account for convection and therefore fail to describe the experimentally observed approach to a constant limiting current. The authors introduce a…
This paper analyzes the stationary spatial distribution of heterogeneous active centers in a plane parallel reaction vessel when centers are lost both at the walls and through quadratic recombination in the volume. The authors formulate a one dimensional diffusion equation with nonlinear termination…
This paper studies the Dirichlet problem for polyharmonic functions in the unit disk and relates the smoothness of the solution to the smoothness of the prescribed boundary values and their normal derivatives. It proves a theorem asserting that if the boundary functions belong to suitable Nikol’skii…
This paper derives analytic sufficient conditions for stability, semistability, and instability of a limit cycle of the differential equation dy/dx = P(x,y)/Q(x,y), assuming sufficient smoothness of P and Q. By introducing normal coordinates near a closed integral curve and studying the displacement…
This study examines how adsorbed surface layers affect the vibrational grinding and dispersion of graphite, a layered hydrophobic solid capable of reaching very high specific surface areas. Using low-temperature nitrogen adsorption, X-ray diffraction, and electron microscopy, the authors relate grap…
This paper reports the thermal telomerization of trichlorosilane with ethylene as an extension of earlier work on hydrosilane addition and telomerization reactions. Trichlorosilane and ethylene were reacted in a steel autoclave at 270 to 285 degrees C and up to 200 atm, and the products were separat…
This study examines the initiation and acceleration of cetane oxidation by molecular oxygen under cobalt-60 gamma irradiation. Using a temperature-controlled flow apparatus, the authors measured the formation of nonvolatile carboxylic acids, volatile acids, and peroxide compounds at 130°C under atmo…
This study examines how the degree of surface hydration affects adsorption of water vapor on several silica gels, including purified technical samples and silica gel calcined at different temperatures. Water vapor adsorption and desorption isotherms were measured with quartz spring balances, while s…
This paper reports electron paramagnetic resonance measurements on several chromium aromatic sandwich compounds whose magnetic susceptibilities indicate one unpaired electron. Using a superheterodyne EPR apparatus at about 9000 MHz, the authors measured spectra, g factors, and line widths for polycr…
This paper derives an expression for the coefficient of turbulent momentum exchange produced by wave motion in shallow water. Starting from finite-depth wave theory, in which particle orbits are elliptical, it applies semi-empirical turbulence relations for mixing length and turbulent viscosity and …
This study examines whether methane can be directly sulfooxidized with gaseous sulfur dioxide and oxygen to form methanesulfonic acid. Experiments in static and flow quartz apparatus tested ultraviolet irradiation, additives, X-rays, elevated temperatures, and a high-frequency electric discharge as …
This study examines the A. E. Arbuzov rearrangement of phosphorous acid esters with alkyl halides using thermographic analysis to detect heat effects associated with reaction stages. Thermograms of aromatic and aliphatic phosphite systems, including triphenyl, trimethyl, and triethyl phosphites with…
This study examines whether properties of thin aqueous electrolyte films previously observed in single capillaries also apply to porous quartz sandstone, with relevance to bound water in gas-bearing and oil-bearing reservoirs. Residual water saturation was measured in Tuymazy sandstone cores after d…
This paper examines the molecular orbitals of condensed systems composed of three fused five-, six-, and seven-membered carbon rings, motivated by known stability predictions for cyclopentadienyl anions, tropylium cations, and related fused-ring carbonium ions. Using the standard LCAO molecular orbi…
This paper reports a synthetic route to the hexahydro-furofuran nucleus found in phenolic resinols, a class of lignan natural products that includes biologically active compounds such as sesamin. Isomeric dibenzoylsuccinic esters were reduced with lithium aluminum hydride to the corresponding tetrao…
This paper formulates a linear model of production planning in which admissible plans are nonnegative combinations of technological methods producing final and intermediate goods while using bounded production factors. It proves an existence and optimality theorem: under a natural no-free-production…
