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
The study examines condensations of newly obtained substituted pyridine-3,4-dicarboxylic acids with hydrazine and aniline, focusing on how substitution affects formation of cyclic hydrazides, N-aminoimides, imides, and dianilides. Heating several dimethyl and hydroxy methyl acids with hydrazine gene…
This paper investigates anomalous electron paramagnetic resonance spectra of dilute solutions of divalent copper amine complexes and interprets them as evidence for association of complex ions. Using EPR measurements of monoethanolamine, ammine, and ethylenediamine copper complexes in solvents of va…
This paper reports the isolation and structural determination of a new triterpene, named myricolal, from the bark of Myrica gale L. Using elemental analysis, derivative formation, infrared absorption spectra, oxidation with chromic anhydride, and reduction with lithium aluminum hydride, the authors …
This paper reports preliminary experiments on producing submillimeter electromagnetic radiation from 17 MeV relativistic electrons passing through a magnetic undulator. The authors describe an undulator built from separate electromagnets to suppress a transverse field component that previously cause…
This paper proposes an entropy-based measure of electron delocalization in atomic and molecular systems, using Born’s probabilistic interpretation of the wave function. For stationary states, the authors define a configuration-space entropy for an entire system and, by integrating the many-electron …
The paper analyzes how a near-surface atmospheric layer with reduced vertical turbulent diffusion affects the ground deposition of a heavy admixture released instantaneously from an elevated point source, when wind speed varies with height as a polynomial. The authors solve the turbulent diffusion e…
This note studies the distribution, over residues modulo a prime p, of very short exponential sums of the form \(\sum_{x=0}^{h}\exp(2\pi i ag^x/p)\), where \(g\geq 2\) is fixed and \(h\) grows but remains at most one half of \(\log p/\log g\). Using Markov’s method of moments, it computes the limiti…
This paper develops a generalized Hartree self-consistent-field method for multiconfiguration atomic calculations, motivated by the need for a Hartree analogue of the generalized Fock method that is not obtained simply by dropping exchange terms. The authors formulate the method by varying multiconf…
This paper studies generalized left rings of quotients of an associative ring with respect to a multiplicatively closed system, especially the system complementing a proper prime ideal. It establishes technical extension and contraction criteria for left ideals, then applies them to the generalized …
This paper analyzes plane flow of an ideal incompressible infinitely conducting fluid past a body when the magnetic field and velocity are nearly, but not exactly, parallel at infinity. It argues that a small transverse magnetic-field component removes the surface field discontinuity present in the …
This paper examines the propagation of a strong point-explosion shock wave in an atmosphere whose density varies exponentially with height, a case in which the usual self-similar solution for a homogeneous medium no longer applies. It proposes a semi-quantitative approximation based on the near-unif…
This note studies nonclassical boundary value problems for partial differential equations using energy inequalities in Sobolev and negative norm spaces. It formulates correctness of boundary conditions through paired estimates for an operator and its formal adjoint, then develops an integration by p…
This paper compares the oxidation of ethyl alcohol in liquid and gas phases under similar temperature conditions in order to clarify why liquid-phase oxidation can differ sharply from gas-phase behavior. Experiments at 200 degrees used a stainless-steel autoclave, elevated pressures, air bubbling, a…
This paper examines the generation and amplification of compression waves during flame propagation in gaseous methane mixtures, focusing on the interaction between a compression wave and the flame reaction zone. The authors propose that amplification occurs because wave-induced increases in temperat…
The paper studies a class of Sobolev-type systems of partial differential equations for which the Cauchy problem is well posed despite not belonging to the classical Kovalevskaya framework. It formulates a mixed problem with initial conditions imposed on solenoidal vector fields and boundary conditi…
This study examines whether high-pressure polymerization of butyraldehyde, yielding unstable polyoxymethylene-type solids, requires prior crystallization as had been reported for acetaldehyde. Purified butyraldehyde was subjected to pressures up to about 7000 kg/cm2 in sealed ampoules and in an opti…
This study examines the alkylation of phenol with amylenes at 100°C using boron fluoride and related catalysts, comparing product yields with those obtained using sulfuric acid and aluminum chloride catalysts. Amylenes prepared from isoamyl alcohol, including 3-methylbutene-1 and 2-methylbutene-2, w…
This paper examines cyclohexane dehydrogenation over nickel catalysts supported on different materials, focusing on how the apparent activation energy depends on benzene adsorption. Using kinetic measurements and relative adsorption coefficients, the authors find a logarithmic relation between appar…
This paper examines how the semiconductor character of galena surfaces affects the fixation of xanthate, with particular attention to the roles of donor lead impurities, adsorbed oxygen, and surface electrochemical heterogeneity. Using thermoelectric electromotive force measurements on several sulfi…
This paper examines the extension of telomerization chemistry to organocyclosiloxanes, using octamethylcyclotetrasiloxane as an inorganic ring system bearing organic substituents and dimethyldichlorosilane as both chain-terminating reagent and ring-opening agent. Heating the reagents without catalys…
This study examines the catalytic behavior of pyrophoric manganese prepared by vacuum decomposition of manganese amalgam, with purity and phase composition checked by radioisotope analysis and X-ray diffraction. Flow reactor experiments tested dehydrogenation of cyclohexene, cyclohexane, and ethylbe…
This study examines how small additions of potash and phosphoric acid affect the catalytic activity of pure chromium oxide in hydrocarbon aromatization reactions, in comparison with earlier observations on alumina, chromium catalysts. Experiments at 450°C with n-heptane, cyclohexane, and a heptane, …
This study determines the crystal and molecular structure of ditoluenechromium iodide by X-ray analysis, using Patterson and difference electron-density methods to locate iodine, chromium, and carbon atoms. The compound crystallizes in a monoclinic cell with cations and anions in special positions, …
This paper examines the orientation of the π-electron cloud in the cyclopropane ring by relating stereochemical constraints to Raman spectral evidence for conjugation with phenyl substituents. Building on earlier comparisons of cis and trans cyclopropane derivatives, the authors study 1,1-diphenylcy…
This study examines the formation of carbonaceous deposits during the decomposition of ethyl alcohol on a copper, silica gel dehydrogenation catalyst, focusing on the relative roles of acetaldehyde and alcohol as carbon sources. Using a radiochemical isotope kinetic method with carbon 14 labeled ace…
This paper investigates the C5-dehydrocyclization of alkylcyclopentanes and paraffins to bicyclic hydrocarbons, prompted by unexplained Raman lines in products from n-octane conversion over platinized carbon. The authors synthesized cis-pentalane, measured its combination-scattering spectrum, and co…
This paper examines base-induced isomerization of 1,1,1,3-tetranitroalkanes to the corresponding 1,1,3,3-tetranitroalkanes, extending earlier observations for tetranitropropane. The authors compare the effects of potassium acetate, potassium methylate, caustic potash, dimethylamine, and ammonia in d…
This paper studies groups in which cyclic subgroups of specified prime orders are complemented, introducing primitive pi-factorizability and related notions of complete approximability by completely primitive finite groups. It gives structural characterizations in terms of embeddings into complete d…
The paper studies Fourier transforms of rapidly decreasing smooth functions on a connected complex semisimple Lie group using representations realized in topological spaces of homogeneous smooth functions on the basic affine space. It defines the basic group ring under convolution and identifies the…
This paper interprets regional deep seismic sounding data collected in 1956 to 1959 along reference profiles in the southeastern Russian Platform, focusing on hodographs and wave groups recorded at overcritical shot to instrument distances. Using kinematic and dynamic criteria, time field constructi…
This note studies when the root subspaces of a dissipative operator in a separable Hilbert space form a basis, extending earlier results on eigenvector bases. It develops criteria for sequences of subspaces to be Riesz or Bari bases, using separation, quadratic closeness to an orthogonal basis, and …
This paper studies nonstationary acoustic diffraction in two-component media with cylindrical or spherical interfaces, focusing on the behavior of the wave field near sliding fronts in the geometrical shadow region. Using exact solutions and the method of separating nonanalytic parts, the authors de…
This note describes a “direct method” for proving embedding theorems by elementary integral estimates, using free parameters, dimensional considerations, differential order, and integral representations of powers of functions. It introduces definitions of dimension, additivity, and differential orde…
This paper examines how sulfur from sulfur-containing surface-active additives becomes incorporated into electrodeposited metals, focusing on nickel and zinc deposits. Using measurements of total sulfur, carbon content, sulfide sulfur liberated during dissolution, anodic separation of sulfide residu…
This study examines whether polymers containing conjugated bond systems can inhibit the thermooxidative degradation of polyvinyl chloride, interpreted as a radical-chain process leading to dehydrochlorination. Polyphenylvinylene, a phenylacetylene copolymer, and a dehydrochlorinated polyvinyl chlori…
This study examines the relative reactivity of C-H and C-T bonds in n-heptane, benzene, toluene, ethylbenzene, and cyclohexane toward methyl radicals in the liquid phase, with attention to aromatic medium effects and the influence of the phenyl group. Using tritium-labeled hydrocarbons and methane r…
This paper addresses conflicting literature values for the potential of zero charge of silver, which ranged widely depending on the experimental method. The author measures the differential capacitance of the double layer on silver electrodes in aqueous sulfate, chloride, and bromide solutions, usin…
The paper describes the M-3, a 4-meter wavelength radar station developed at Tomsk Polytechnic Institute for meteor observations under the International Geophysical Year program. It addresses limitations of standard Soviet meteor radars operating at 50 pulses per second, particularly reduced meteor …
This paper examines how variations in cosmic radio noise affect the hourly number of meteors detected by radar, through their influence on the receiver threshold signal. Using the known dependence of detected meteor counts on threshold power and the relation between threshold power, antenna temperat…
This paper examines how radar threshold signal variation can be used to determine the exponent characterizing the mass distribution of meteoroids. Starting from a power law mass distribution and the relation between meteoroid mass, trail electron density, and echo power, it derives a general express…
This paper extends a previously developed comparison method for meteor radar systems to the detection of persistent radio echoes from trails with high linear electron density. It derives how the average hourly number of detected meteors depends on pulse power, receiver threshold, pulse shape, receiv…
This paper reexamines radar observations of the 1956 Perseid meteor shower that had been interpreted as evidence for three distinct meteor streams. It argues that the observed peaks in the hourly number of meteor echoes can be explained by the lobed vertical radiation pattern of the antenna system, …
This paper examines how the duration distribution of persistent meteor radio echoes can be used to estimate the mass distribution exponent of meteoroid bodies. Using radar observations made on July 28 and 29, 1957, with the TPI-2 meteor radar, the author constructs an integral duration distribution …
This paper examines how the choice of local oscillator frequency in a VHF superheterodyne receiver affects interference from cosmic noise in meteor radar observations. It models cosmic noise spectral density, receiver high-frequency gain, and image-channel transmission to derive expressions for the …
This paper describes a two-channel method for measuring phase differences between alternating-current signals while permitting continuous photographic recording from a cathode-ray indicator. The method forms sum and difference voltages from the input signals, uses automatic gain control to hold the …
This paper proposes a two half-cycle acceleration system for synchrotrons intended to reduce reliance on bulky external resonators and make greater use of accelerating structures integrated into the vacuum chamber. The scheme uses two successive accelerating gaps, such as annular slots in the chambe…
This paper studies connected compact Lie groups acting transitively on selected homogeneous manifolds, extending the known classification for spheres. It develops a topological method based on real cohomology, primitive elements, Poincaré polynomials, and ranks of homotopy groups, showing that certa…
This paper investigates isomeric states and selected level schemes in the odd-mass spherical europium nuclei Eu-147, Eu-149, and Eu-151, focusing on levels associated with h11/2 configurations and M2 and E3 transitions. Using gamma-gamma and gamma-electron coincidence measurements with variable dela…
This paper studies the azimuthal asymmetry in the scattering of partially polarized Dirac particles by an arbitrary spherically symmetric potential. Using first-approximation phase shifts and retaining quadratic terms in the expansion of the exact partial-wave amplitudes, it derives real and imagina…
This paper presents results of 1959 deep seismic sounding along the Amu Darya, Karabekaul to Nuratau profile in the Bukhara region, aimed at clarifying the Paleozoic basement relief, major crustal boundaries, and the geological meaning of gravity and magnetic anomalies. Using a low-frequency correla…
