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 note studies when Gaussian measures induced on function space by real processes with stationary Gaussian increments and zero mean are equivalent or mutually singular. It formulates sufficient conditions in terms of the asymptotic behavior of the spectral densities, especially for pairs whose de…
This paper examines anomalous intensity distributions in infrared absorption doublets arising from Fermi resonance in condensed polyatomic molecules. Using temperature-dependent spectra of crystalline carbon tetrachloride, iodobenzene, and chlorobenzene, and polarized measurements for carbon tetrach…
This study examines the behavior and reversibility of platinum electrodes exposed to oxygen and carbon dioxide mixtures in molten alkali carbonates. Gas concentration cells with a potassium, sodium, and lithium carbonate melt were measured at about 720 °C while varying the partial pressures of oxyge…
The study examines the reaction of sodium hexanitrocobaltate with pyridine under anhydrous and aqueous conditions in order to obtain and characterize nitropyridine complexes of cobalt. Heating the solid hexanitrocobaltate hydrate with excess anhydrous pyridine gave crystalline inner-sphere trinitrot…
This paper studies periodic solutions and Lyapunov stability for systems of ordinary differential equations with periodic right-hand sides that preserve the nonnegative cone. Using the Poincare-Andronov operator and the theory of nonlinear positive and concave operators, it formulates growth and dec…
This study examines the thermal stability of zirconium and hafnium tetrachlorides, tetrabromides, and tetraiodides during single impacts with a heated molybdenum surface in high vacuum, a problem relevant to separation processes for these elements. Purified tetrahalides were effused from a capillary…
The paper formulates the nonstationary problem of axial impact of a finite viscoplastic rod against a rigid barrier, treating the motion as quasi-one-dimensional and separating the rod into viscoplastic and rigid regions divided by a moving boundary. By nondimensionalizing the governing relations, t…
This note examines the hypothesis that, at high energies and large momentum transfers, matrix elements of strong-interaction processes become approximately invariant under gamma5 transformations of spinor particles. Using Lorentz-invariant forms of electromagnetic vertices and scattering amplitudes,…
This paper studies the mixed initial boundary value problem for a hyperbolic equation whose elliptic spatial operator has discontinuous coefficients across internal interfaces. Using the Fourier method with eigenfunctions of the associated self-adjoint transmission problem, it proves uniqueness and,…
This paper investigates the composition and structure of amorphin, a glycoside from fruits of Amorpha species, and its aglycone amorphigenin. Through acid hydrolysis, methylation analysis, spectroscopy, oxidation, hydrogenation, and comparison with known rotenoid derivatives, the authors identify th…
This paper addresses the estimation of the vertical turbulent diffusion coefficient for a monodisperse atmospheric admixture that settles under gravity after release from an instantaneous point source. Solving the turbulent diffusion equation with constant wind, settling velocity, and diffusion coef…
The paper examines the photochemical radical addition of hydrogen sulfide to unsymmetrical fluoroolefins, principally perfluoropropylene, under moderated conditions in a perfluorinated solvent. Irradiation of perfluoropropylene with hydrogen sulfide gave two isomeric monohydroperfluoropropyl mercapt…
The paper studies the Dirichlet problem in the unit disk for a finite system of elliptic equations of the form \(A u_{xx} + 2B u_{xy} + C u_{yy} = 0\), extending an earlier two-equation case to arbitrary finite order under the same characteristic-root assumptions. It derives an explicit representati…
The crystal structure of cadmium bromide dipyridinate, CdBr2·2(C5H5N), was investigated to clarify whether substitution of ammonia by an aromatic amine changes the coordination of cadmium in cadmium halide addition compounds. X-ray diffraction data from needle-shaped orthorhombic crystals were analy…
This paper studies the algorithmic complexity of discrete functions computed by binary and fixed finite-state automata, measuring complexity by the tradeoff between the number of cells and operating time. It defines a complexity set for automata realizing a given function and discusses cascades and …
This paper examines the applicability of established coprecipitation formulas to anomalous mixed crystals formed by nonisomorphous components, especially under conditions of crystallization from supersaturated solutions. It argues that logarithmic distribution behavior depends on the type of interac…
The paper analyzes vibrational relaxation of diatomic J2 in mixtures with helium, emphasizing the regime in which vibrational energy transfer in J2 and He collisions is strongly nonadiabatic. Using a harmonic oscillator approximation and a previously derived transition probability formula, it shows …
This study examines how the composition of peptide-forming components affects the relative rates of peptide bond synthesis in model glycine systems. The authors measured pseudo-first-order aminolysis rates of p-nitrophenyl esters of acetic acid and N-carbobenzoxy glycine peptides with ethyl esters o…
This paper examines how substituents in thiazoline heteroresidues influence the color and basicity of polymethine dyes when the substituents are not conjugated with the main chromophore. The authors synthesized a series of symmetric thiazolinocyanines and dimethinemerocyanines containing methyl or p…
This study examines how the specific radioactivity of solid potassium sulfate affects its recrystallization from saturated nitric acid solutions and the distribution of a cerium microimpurity. Potassium sulfate precipitates containing different activities of sulfur 35 and tracer cerium 141 were prep…
This paper examines the reaction of trialkylarsine oxides with electrophilic reagents, focusing on the interaction of triethylarsine oxide with alkyl iodides in benzene solution. Heating triethylarsine oxide with isopropyl iodide or isobutyl iodide gave the same crystalline product, identified by el…
This note studies boundary correspondence for homeomorphic Q-quasiconformal mappings of a ball in N-dimensional Euclidean space. It introduces regular sequences of subdomains and boundary elements, proves that regular sequences in a ball contract to single boundary points, and shows that such sequen…
The paper studies Bernstein’s problem on weighted polynomial approximation on the real axis in the case where polynomials are not dense in the full weighted space of continuous functions. It introduces an extremal function defined over entire functions of zero degree and proves a necessary and suffi…
The study examines how cadmium impurities modify the effect of preliminary irradiation on the subsequent thermal decomposition of silver oxalate. Samples containing varying amounts of cadmium oxalate were prepared by coprecipitation, characterized by X-ray analysis, and studied by measurements of ph…
This note studies the uniqueness of extremal functions in sharp estimates for Taylor coefficients of bounded holomorphic functions of two complex variables. Using diagonal series representations, boundary values in Hardy class H1, and integral formulas for coefficients, it derives coefficient estima…
This note studies the sign of the Green’s function for a linear second order difference boundary value problem with zero endpoint conditions. After defining the associated Cauchy function and a notion of critical point, it shows that the usual Sturm type zero separation behavior for differential equ…
This paper investigates whether supercooled water droplets of cloud size can transform directly into well-faceted individual ice crystals, a question relevant to theories of secondary ice formation in the atmosphere. Laboratory experiments used distilled water droplets tens of microns in diameter co…
The study examines infrared spectra of solid inner-complex uranyl compounds with several Schiff bases in the 700 to 1000 cm⁻¹ region, focusing on the symmetric and asymmetric stretching vibrations of the uranyl group. From the observed bands, the U, O force constants were calculated and used with Ba…
This study examines conditions for electrolytically isolating the intermetallic compound Ni3Al formed in multicomponent nickel-base alloys containing chromium, tungsten, molybdenum, aluminum, niobium, and titanium. Several electrolytes previously used for extracting the gamma prime phase were compar…
This study examines whether a polyester and a polyamide can undergo exchange reactions in the melt to form a polyamido ester, using polyethylene sebacinate and polyhexamethylene sebacamide as the principal system. Model experiments with acetanilide and benzyl benzoate indicated that amide and ester …
This paper analyzes supersonic flow of a weakly relaxing gas past a wedge, with particular attention to vibrational relaxation behind an oblique shock. By linearizing the gas-dynamic equations with a relaxation term and solving the resulting boundary-value problem, it derives exact series expression…
This paper applies an approximate theory of normal flame propagation for chain reactions to hydrogen chlorine mixtures, using integrated heat conduction and diffusion profiles rather than a prescribed Michelson profile. The authors derive expressions for flame velocity and chlorine atom concentratio…
This study examines the preparation and chemical behavior of metallic scandium, with emphasis on obtaining higher purity material from calcium-reduced scandium chloride products. High-vacuum sublimation in a tantalum apparatus produced compact scandium of about 99.5 wt.% purity with reduced oxygen c…
This study examines the reactions of substituted triarylchloro- and triarylbromomethanes with sodium and potassium salts of dialkylphosphorous acids, focusing on methoxy-, ethoxy-, chloro-, and bromo-substituted derivatives. The authors synthesize several triarylbromomethanes and compare reaction ou…
This study investigates the formation of free radicals during autoxidation reactions of diphenylamine and paraphenylenediamine photosensitized by chlorophyll a and pheophytin a. Using spectrophotometry and electron paramagnetic resonance, the authors irradiated purified amine solutions with red ligh…
This note derives an expression for the evolution of potential vorticity in a stratified fluid subject to weak external influences, including heat influx and frictional forces. Starting from the hydrodynamic equations, continuity equation, equation of state, and a prescribed entropy change, it shows…
This paper reports direct experimental measurements of the Earth’s outgoing thermal radiation, a key component of the planetary energy balance previously estimated mainly by calculation. The authors describe infrared radiometric apparatus flown on stabilized high-altitude geophysical rockets, using …
The paper analyzes how the structure of the electrical double layer affects irreversible polarographic reduction waves of organic compounds when proton consumption occurs in the potential-determining stage. Building on Frumkin’s theory, it argues that such reductions are generally preceded by proton…
This study examines iron aluminum alloys near the Fe3Al composition, where ordering transformations strongly affect physical and mechanical properties. Alloys prepared by vacuum induction melting were investigated using dilatometry, hot hardness, high temperature strength tests, and supporting measu…
The paper develops a nonrelativistic treatment of anisotropic hyperfine splitting in electron paramagnetic resonance spectra of free radicals, relating the spin Hamiltonian to the magnetic field generated by electron spin currents. From a many-electron formulation, the authors derive expressions for…
This study examines energy transfer during the radiolysis of frozen toluene containing small additions of carbon tetrachloride, benzoyl peroxide, or carbon disulfide. Using electron paramagnetic resonance during irradiation by 1.6 MeV electrons at low temperature, the authors measured radical accumu…
This paper extends known results relating growth indicators and zero distributions of entire functions of finite order and completely regular growth to subharmonic functions in multidimensional Euclidean space. It develops analytic properties of the spherical indicator, introduces subspherical funct…
This note studies inequalities and convexity descriptions for eigenvalues and singular values of sums and products of linear operators. Building on geometric majorization lemmas derived from convex hull arguments and the Krein-Milman theorem, it gives finite-dimensional results for singular values o…
This study examines the mechanism of electroreduction of divalent copper in sulfate solutions, focusing on whether monovalent copper is formed as an unstable intermediate despite the appearance of a single polarographic wave. Using a rotating disk electrode with a concentric ring, the authors measur…
This study examines the synthesis and reactivity of N,N-dialkylamino-dialkylmercaptomethanes, termed amidomercaptals, with compounds containing primary amino groups. New acyclic and cyclic dimethylformamide mercaptals were prepared, and their catalyst-free reactions with aliphatic, cycloaliphatic, a…
This note studies simultaneous uniform approximation of functions and their derivatives by entire functions of bounded degree, focusing on uniformly almost-periodic functions whose Fourier exponents have bounded local density. It defines approximation constants comparing the errors for derivatives u…
The study examines emulsion polymerization of alpha-methacrolein using several oxidation reduction initiating systems and an aqueous sulfurous acid polyacrolein emulsifier intended to promote polymerization in micelles. Polymerizations with potassium persulfate alone or combined with silver nitrate,…
This paper studies the structure of solution sets for nonlinear parabolic evolution equations and mixed boundary value problems, extending the Kneser Hukuhara connectedness principle from ordinary differential equations to parabolic settings. Using a topological connectedness theorem for fixed point…
