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 describes a pyrophosphate method for synthesizing nucleotidyl amino acids containing a phosphamide P,N bond, using nucleoside diphenyl pyrophosphates as reactive phosphorylating agents toward phenylalanine methyl ester. The authors prepare methyl esters of uridylyl, adenylyl, guanylyl, an…
This paper estimates the geothermal field around Avachinsky volcano in Kamchatka, using geophysical evidence for an intermediate spherical magmatic chamber beneath the volcano. The calculation models the chamber as a constant temperature sphere embedded in a medium with a regional geothermal gradien…
The study examines how bromide anions catalyze the monomolecular isotopic exchange of p-nitrobenzylmercury bromide with radioactive mercuric bromide in dimethyl sulfoxide, where ionization of the organomercury compound controls the rate. Kinetic measurements at 18 °C with varying potassium bromide c…
The paper studies equivalent transformations of graph schemes associated with finite automata, focusing on whether local replacement rules for equivalent subschemes can generate all equivalences. It defines path-language equivalence for such schemes, introduces substitution by regular two-pole schem…
This note introduces notions of tau-continuity and tau-differentiability for complex-valued functionals on the space of real piecewise-continuous functions on an interval, using localized perturbations of the independent variable. It establishes basic closure and continuity properties, compares tau-…
This paper reports the preparation and characterization of cyclopentadienyl zirconium compounds containing a zirconoxane Zr O Zr linkage, a class previously not described. Tetracyclopentadienyldizirconoxane dichloride was obtained by hydrolysis of ethoxydicyclopentadienylzirconium chloride and, more…
This paper describes the preparation of new cyclopentadienyl dizirconoxane derivatives containing aryl or acetylacetonate groups, addressing the limited availability of zirconium compounds combining metal-carbon bonds with cyclopentadienyl ligands. Diphenyl and di-p-tolyl tetracyclopentadienyldizirc…
This paper studies a non-self-adjoint second order differential operator on the half-axis with complex potential and boundary condition, focusing on analytic continuation of the Jost-type solution and consequences for spectral theory. Assuming the potential is summable on the half-axis and holomorph…
This paper examines how the hyperfine structure constant of electron paramagnetic resonance spectra of impurity manganese ions can be used to evaluate chemical bonding in minerals and inorganic compounds. Using new measurements on 28 natural minerals together with published data for nearly 80 compou…
This paper examines anomalous rheological behavior in rubber-like linear polymers, focusing on polyisobutylene of several molecular weights at 60 to 120°C under controlled shear-rate and controlled-stress conditions. Rotational viscometry, molecular-weight checks by viscosity, and activation-energy …
This paper addresses the sign and magnitude of effective ionic charges in sphalerite-structure III-V semiconductor compounds, a question central to understanding the partly ionic and partly covalent character of their chemical bonding. The authors determine effective charges for aluminum, gallium, a…
The paper studies when arcs of level lines of normalized univalent holomorphic functions in the unit disk are starlike with respect to the origin. Using Loewner’s differential equation and sharp estimates for functionals involving the modulus of the image point and the argument of zf′(z)/f(z), it de…
A numerical method is presented for determining the self-consistent electrostatic field around an axisymmetric body in a rarefied plasma stream, where ion motion is treated collisionlessly and electron density is prescribed as a function of potential and ion density. The approach uses a discrete mod…
This paper examines induced scattering, two quantum emission, and two quantum absorption by charged particles in a medium, with emphasis on the resonant regime near the Cherenkov condition. Using quantum electrodynamic perturbation theory supplemented by radiative corrections to the particle Green’s…
A method is proposed for estimating ratios of rate constants for reactions of solvated electrons and H and OH radicals with radical acceptors in irradiated aqueous systems, avoiding the need to specify the full reaction mechanism required by competing acceptor methods. The approach uses the observed…
The paper reports experiments on electroluminescence in sublimated polycrystalline zinc sulfide films activated with copper, using slot-like electrode cells with electrode separations from fractions of a millimeter to about 2 mm. The films exhibited through, or bulk, luminescence from cathode to ano…
The paper studies representations of the group of complex unimodular second order matrices, identified with the Lorentz group setting, that are unitary in spaces with an indefinite Pi_n metric. It reduces the classification problem to representations possessing a maximal null invariant subspace and …
This note determines the sharp perturbation bound in the Paley, Wiener problem for exponential systems in \(L_2(-\pi,\pi)\). For real frequencies \(\lambda_k=k+\delta_k\), it proves that if \(\sup_k|\delta_k|<0.25\), then \(\{e^{i\lambda_k t}\}\) is a Riesz basis, using the Paley, Wiener lemma and F…
This note studies double layer potentials carried by a general closed oriented hypersurface in multidimensional Euclidean space, using the solid angle measure induced by projection from a point onto the unit sphere. It gives criteria for this set function to extend to a finite generalized Borel meas…
This study examines whether phenyl radicals undergo isomerization in free-radical reactions of diphenylmercury, using diphenylmercury labeled with carbon-14 in the 1,1′ positions of the benzene rings. The authors carried out photodecomposition in benzene and copper-assisted thermal decomposition, is…
This study examines the alkaline hydrolysis kinetics of phenyl and p-chlorophenyl beta-D-glycosides of glucose, galactose, and xylose, a class less characterized than in acid hydrolysis. Hydrolysis was conducted in 4 N sodium hydroxide at 80 degrees C and followed primarily by semimicropolarimetry, …
This paper studies admissible infinitesimal bendings of a class of nonregular developable surfaces called ribbed cylindroids of type A, whose regular zero Gaussian curvature parts are joined along generator ribs and whose boundary curves lie in parallel planes. Using a lemma on infinitesimal bending…
This paper studies infinitesimal deformations of positively curved surfaces with prescribed changes of the linear element when the boundary is constrained to slide along a supporting surface. The problem is reduced to a boundary value problem for functions derived from the displacement field, and so…
This paper analyzes the onset of noise and enhanced cross-field diffusion in a weakly ionized, inhomogeneous plasma at magnetic fields above a critical value, focusing on the frequency range between the ion and electron cyclotron frequencies where ordinary drift waves are damped. Using a hydrodynami…
This note addresses the reduction principle for stability of the zero solution of a nonlinear differential system whose linear part has critical variables with zero real eigenvalues and stable variables with negative real eigenvalues. Under local Lipschitz assumptions with an infinitesimal constant,…
This paper studies when functions continuous on an unbounded closed set in the complex plane, and analytic at its interior points, can be uniformly approximated on that set by entire functions. It proves that such approximation is possible for every admissible function exactly when the set satisfies…
This paper examines the mechanism of isotopic exchange between benzylmercury halides and radioactive mercuric halide, focusing on whether structural and solvent effects can produce a monomolecular electrophilic substitution pathway. The authors study the exchange of p-nitrobenzylmercury bromide with…
This study examines free-radical reactions occurring when oxygen interacts with gamma-irradiated potassium palmitate, using oxygen sorption measurements and EPR spectroscopy over a range of oxygen pressures and temperatures. At room temperature, oxygen uptake corresponds quantitatively to the disapp…
This study examines the tautomeric structure of thiosemicarbazones of ethyl pyruvate, acetoacetic ester, and ethyl levulinate using infrared and Raman spectra, with additional ultraviolet and NMR data for the pyruvate derivative. The authors compare carbonyl and imine stretching frequencies in cryst…
This study investigates the onset and early development of plastic deformation in polycrystalline austenitic steel 1Kh18N9T using thin photoelastic epoxy coatings observed in polarized light. The method allowed local measurement of the magnitude and direction of principal strain differences within i…
The paper studies when generalized solutions of differential equations in a half-space possess boundary limits as the normal variable tends to zero. It introduces spaces measuring the existence of such limits for distributions and proves regularity results for systems solvable with respect to the hi…
This note studies a nonlinear singular integral equation with Cauchy kernel in a Hölder-type class of functions that vanish at the endpoints of a finite interval with prescribed power behavior. Under a Lipschitz condition on the nonlinearity, the authors prove mapping and continuity properties for t…
This study examines how the phase state of diketene affects the chemical structure of polymers formed during polymerization initiated by magnesium. Diketene and magnesium vapors were co-condensed under high vacuum at low temperatures, and the resulting products were analyzed by infrared spectroscopy…
This study examines the relationship between configuration and boiling point order in stereoisomeric 1-methyl- and 1-ethyl-4-tert-butylcyclohexanes, a case relevant to proposed rules for disubstituted cyclohexanes. The authors synthesized the corresponding tert-butylalkylbenzenes, hydrogenated them …
This paper examines the use of ultrathin sections for direct electron microscopic study of glass crystallization, especially the poorly characterized precrystallization stage. Lithium silicate, magnesia aluminosilicate, and platinum-containing lithium magnesium silicate glasses were quenched, heat t…
This study addresses the unresolved structure of products formed in the photochemical reduction of porphyrins, focusing on whether hydrogen atoms add to central, bridge, or pyrrole-ring sites. The authors examine tetraazoporphin, whose bridge CH groups are replaced by nitrogen, using visible and inf…
This paper examines nuclear quadrupole relaxation of deuterium in molecular liquids as a means of estimating electric field gradients and quadrupole coupling constants in chemical bonds. Spin lattice relaxation times were measured by the spin echo method at 4.4 Mc/s for deuterated water, alcohols, b…
This study examines the acidity and enolization of 2-arylindandione-1,3 derivatives, compounds previously treated mainly as pseudoacids without proven enol forms. Using ultraviolet and visible spectrophotometry in water, aqueous alcohols, alcohols, acetone, dioxane, and nonpolar solvents, the author…
This paper examines carrier-gas-free frontal gas chromatography, focusing on calculation of mixture composition and on the broadening of chromatographic fronts. For ternary mixtures with linear adsorption isotherms, the authors derive two calibration-based methods for determining composition, one us…
This paper develops the theory of smooth oriented codimension one foliations on orientable manifolds, extending earlier work on closed leaves and Reeb components in three dimensional manifolds. It introduces limit epimorphisms for homotopy classes in leaves and proves that certain global topological…
The paper derives a Lagrangian formulation for a relativistic continuous medium in Riemannian space, starting from the Hamilton Jacobi equation for a material point and extending it by replacing particle energy with the enthalpy per unit rest mass of the medium. It shows that the pressure can serve …
This study examines the role of stearic acid in the polishing of aluminum using carbon-14 labeled stearic acid as a radioactive tracer. Duralumin specimens were polished with a chromium oxide paste containing labeled acid, then subjected to radiometric measurement, solvent extraction, hydrolysis, el…
This paper examines the contour shapes of the R1 and R2 absorption lines of ruby, addressing whether they are better represented by Lorentzian or Gaussian profiles. Absorption spectra were measured photographically at room temperature for ordinary and extraordinary rays, and anomalous dispersion was…
This study investigates mechanochemical transformations in low- and high-pressure polyethylene using infrared spectroscopy. Polyethylene films were subjected to stretching, repeated deformation and relaxation, rupture under static and dynamic loads, and surface planing, including experiments in liqu…
The paper studies weight characteristics of topological spaces satisfying natural invariance, monotonicity, additivity, and nontriviality conditions, and introduces local, modular, unimodular, and stepwise weight functions. It proves that local characteristic functions on regular spaces are stepwise…
The paper examines the interaction of aluminum chloride and beryllium chloride, a system of theoretically related chlorides with similar bonding and crystal-lattice characteristics. Using thermographic and X-ray phase analysis, electrical conductivity measurements, vapor-pressure studies, chemical a…
This paper reports the synthesis and characterization of glycidyl esters of phosphorus acids, a class for which little physicochemical information was available beyond patents. Glycidol was reacted with mono- and dichloroanhydrides of trivalent phosphorus acid esters in the presence of triethylamine…
This paper examines criteria for distinguishing adsorption isotherms for organic substances on mercury when concentration dependent data can fit several equations over limited ranges. It compares the Langmuir, Frumkin, and Parsons type formulations by deriving diagnostic relations involving the surf…
This paper examines whether variations in infrared heat flux from the lunar surface reflect temperature differences alone or also changes in emissivity, with attention to mare and continental regions. Using two-channel radiometric observations at 3.6 microns and 8 to 13 microns during the lunar ecli…
