SovietRxiv · Open Access in English
Rediscovering the Soviet scientific archive, in English
25357 full-text translations 14926 English PDFs 22539 abstracts
Showing 50 of 25357 papers
This study compares chemical ripening and photolysis in photographic emulsions in order to clarify common features of the topochemical and photochemical transformations that determine image quality. Using photometric measurements, oxidation to separate surface from internal centers, and comparison w…
A one-stage method is described for converting alpha-keto epoxides into cis-16 alpha,17 alpha-diols using carbethoxyhydrazine sulfate in aqueous dioxane at room temperature. The authors argue, from observations on hydrazone formation and subsequent acid treatment, that the reaction proceeds through …
The paper addresses abstract synthesis for an extended language of regular expressions that includes intersection and complementation, for which earlier synthesis procedures were not directly algorithmic. It defines a finite basis of regular expressions through derivative-like equations and gives an…
This study examines the reversible photochemical oxidation of chlorophyll a by aromatic nitro compounds, motivated by the proposed role of excited chlorophyll as an electron donor in photosynthetic photochemistry. Using low-temperature frozen alcohol, glycerol solutions, absorption spectroscopy, act…
This note develops a general construction of spectral expansions in eigenfunctionals for self-adjoint operators in Hilbert space, including operators with continuous spectrum and without prior restrictions on the spectral family or the structure of the space. Using boundary limits of expressions for…
This letter corrects several formulas and conclusions in the author’s earlier article on the molecular orbital theory of diamagnetism in cyclic molecules and the magnetic anisotropy of cyclopropane. It states that specified paramagnetic tensor terms should be zero, invalidating the previous argument…
The paper addresses the difficulty of measuring activation overvoltage and exchange currents for rapid metal deposition and dissolution processes in pure molten salts, focusing on silver in molten silver nitrate. It develops a method based on overvoltage versus time curves during initial electrolysi…
This note studies generalized solvability conditions in group theory through the introduction of weakly normal subgroups and related uniform and weakly normal series. It establishes analogues of the normalizer condition for periodic groups, finite groups, and groups possessing ascending series with …
This paper studies a family of antagonistic differential games modeling pursuit and survival in a closed convex subset of Euclidean space, where a faster pursuer and a slower evader may continuously choose directions of motion. It formalizes admissible pure strategies, defines capture and escape pay…
The paper solves an axisymmetric consolidation problem for a fluid-saturated compressible porous half-space subjected to normal surface loading, using Biot’s equations with zero Poisson coefficient and boundary conditions corresponding to free drainage at the surface. By introducing potential functi…
This paper examines the use of infrared absorption spectra to distinguish cis and trans configurations in propenyl organometallic compounds of trivalent arsenic, divalent mercury, and tetravalent tin. Spectra of cis and trans tripropenylarsine, propenylmercury chloride, and tetrapropenyltin are comp…
Infrared spectra were measured for iminodiacetic acid, its potassium salts, several neutral alkaline earth and trivalent metal iminodiacetates, and selected deuterated analogues in order to assign N-H, C-H, C-N, and carboxyl stretching bands and assess metal-nitrogen bonding. Comparison of frequency…
The paper studies the behavior at infinity of spectral kernels and eigenfunctions for arbitrary self-adjoint extensions of the Schrödinger operator in Euclidean space with a smooth potential, without assuming semiboundedness. It proves growth estimates for the spectral kernel, valid for almost every…
This study examines the radiation chemical oxidation of potassium iodide in aqueous solutions saturated with nitrous oxide under cobalt-60 gamma irradiation, with emphasis on how pH affects the yields of free iodine and nitrogen. By measuring product yields in 0.05 and 0.5 M potassium iodide solutio…
The study examines the direction of addition of trialkylsilanes to several unsaturated alcohols, including methylethynylcarbinol, dimethylethynylcarbinol, and methyltrifluoromethylethynylcarbinol. Using chloroplatinic acid or platinum on carbon catalysis, the authors show that hydrosilylation procee…
This paper analyzes parallel decoding for discrete stationary channels with independent noise as a way to reduce the computational burden of optimal decoding, whose complexity grows exponentially with block length. The method divides the received word into subwords, enumerates candidate input subwor…
Infrared absorption and EPR spectroscopy were used to examine the state of the V=O bond in solutions of hydrated vanadyl chloride in several organic solvents, with attention to the effects of added water and temperature. The infrared spectra show a solvent-independent V=O band at 1014 cm⁻¹ assigned …
This note studies approximation of Stepanov almost periodic functions by uniformly almost periodic functions and entire functions of bounded degree, using convolution kernels with controlled Fourier transforms. It establishes estimates in the Stepanov metric for truncated spectral approximants, rela…
This study examines whether a GaSe single crystal can serve as the active medium for an optical quantum generator excited by fast electrons. The authors irradiated p-type GaSe crystals cooled to liquid nitrogen temperature with 200 keV electron pulses and recorded the luminescence spectrum, focusing…
This paper develops an analytical description of chain-thermal self-ignition in hydrogen halogenation systems where energy branching may occur through vibrationally excited hydrogen halide molecules. A kinetic scheme for chlorination or fluorination is coupled with an adiabatic heat-balance equation…
This paper examines the conditions under which configurationally ordered alloy phases can retain a fixed crystallographic symmetry over changes in temperature, pressure, and chemical potential. Representing the equilibrium atomic density as a Fourier expansion, it argues that the wave vectors defini…
This paper proves an upper bound for the entropy of a classical dynamical system, defined as a measure-preserving diffeomorphism of a compact Riemannian manifold. The argument relates entropy growth for finite smooth partitions to the growth of boundary area, using an entropy inequality for probabil…
The paper studies elementary theories of maximal non-Archimedean normed fields, formulated as structures consisting of a field, valuation, and value group. After introducing algebraic completeness and pseudo-convergent completeness, it establishes isomorphism and elementary equivalence criteria show…
Electron paramagnetic resonance was used to study Mo(V) complexes in concentrated hydrobromic acid and in mixed hydrochloric and hydrobromic acid solutions. Measurements at about 10,000 MHz showed that Mo(V) in hydrobromic acid gives an isotropic spectrum assigned to the bromide complex, with g = 1.…
This exploratory study investigates how illumination affects the adsorption capacity of more than thirty oxide powders toward oxygen, hydrogen, and methane. Samples were pretreated by heating and evacuation, exposed to gases at low pressure after dark adsorption equilibrium or near equilibrium, and …
This paper studies locally bicompact topological groups, focusing on the relation between local projective nilpotence, bicompact generation, and the structure of bicompact elements. It proves that every bicompactly generated locally projectively nilpotent group is projectively nilpotent, hence proje…
This paper addresses the difficult synthesis of 3-vinylquinuclidine, where earlier approaches often gave mixtures with the isomeric 3-ethylidenequinuclidine. A preparative route is described in which quinuclidone-3 is converted to 3-formylquinuclidine and then treated with triphenylmethylenephosphor…
This paper applies Cartan’s theorem A, through the finite generation of ideals of holomorphic functions on a compact simply connected polycylinder, to questions in mathematical statistics. It considers families of statistics connected by parameters whose generalized moments depend holomorphically on…
The paper studies the asymptotic distribution of eigenvalues for the Laplacian on an elliptical membrane under Dirichlet and Neumann boundary conditions. By separating variables in elliptic coordinates, the problem is reduced to asymptotic analysis of Mathieu equations, followed by counting lattice …
This paper examines the radical polymerization behavior of N-substituted imides of citraconic acid, with primary attention to N-methylcitraconimide, in relation to the structure of related unsaturated dicarboxylic acid derivatives. Polymerization experiments with initiators, kinetic measurements, in…
The paper studies groups of one-to-one automaton mappings of words over an n-letter alphabet and their finite-automaton subgroups through the structure of automaton substitutions on words of fixed length. It introduces a dual form of the wreath product, proves that each group of substitutions on wor…
This paper studies periodic regimes in distributed diffusion systems motivated by self-oscillations in electrochemical processes with nonlinear boundary behavior at an electrode. It derives explicit periodic solutions of the diffusion equation on a semi-infinite domain for piecewise linear boundary …
This paper examines why observed proton chemical shifts in CHXYZ-type compounds do not directly correlate with Taft inductive sigma constants, despite both being related to substituent effects on electron density. Using semiempirical anisotropy corrections derived from carbon-13 proton spin coupling…
The paper describes a differential thermal analysis technique for detecting first-order polymorphic transitions in solids under pressures up to 100 kbar at room temperature. Using a high-pressure chamber fitted with a differential chromel-alumel thermocouple and bismuth as a reference material, the …
This note derives a coordinate-space expression for the total number of quanta associated with a free classical electromagnetic field specified by its electric and magnetic fields at a fixed time. Starting from the Fourier decomposition into transverse waves, the author relates the usual mode occupa…
This paper studies the characterization of events representable by finite probabilistic automata, extending Rabin’s observation that such events form a broader class than regular events. It formulates representability in terms of finite-dimensional stochastic vector functions and gives necessary and…
This paper examines whether Shannon information entropy, calculated from the isomer distribution in aromatic substitution of monosubstituted benzenes, correlates with Taft polar substituent constants. Using product distributions for nitration in acetic anhydride and chlorination in acetic acid, the …
A method is described for synthesizing nitrogen-containing polymers with conjugated C=N bonds in the main chain from amides and ammonium salts of mono- and dibasic organic acids, using zinc chloride as dehydrating agent and catalyst under autoclave heating. The resulting colored, insoluble, infusibl…
This study examines modification of isotactic polypropylene to improve low-temperature resistance without substantially reducing mechanical strength. The authors introduce alkaline sulfate lignin under processing conditions as a presumed cross-linking agent, together with dioctyl sebacate as a plast…
This paper experimentally investigates thermoosmosis of bidistilled water in completely filled glass capillaries with micron-scale diameters, motivated by the role of such effects in moisture behavior near soil surfaces. An apparatus with a thermostated capillary section and capillary-pressure compe…
This paper studies the topological structure of cones in Banach spaces, especially cones generated by bases or minimal systems. It proves that in a separable Banach space every normal cone can be made strongly acute by an equivalent norm, using an embedding into a space of continuous functions and a…
This paper proposes a phenomenological connection between the crystal structure of iron group ferromagnets and both local atomic magnetic moments and effective magnetic fields at nuclei. It introduces characteristic interatomic distance and coordination dependent parameters to calculate moments in p…
This paper reports measurements of the spectral distribution and temperature dependence of photoconductivity in p-type ZnSiAs2 and CdGeAs2 single crystals. Using monochromator-based photoresponse measurements, the authors identify intrinsic photoconductivity in ZnSiAs2, estimate band gaps of 2.10 eV…
This paper examines the synthesis and acid-catalyzed isomerization of a tertiary beta-acetylenic alcohol bearing a cyclopentadienylmanganese tricarbonyl substituent. The alcohol, 4-hydroxy-4-methyl-2-hepten-6-yn-2-yl-2-cyclopentadienylmanganese tricarbonyl, was prepared by reaction of a manganese tr…
This paper examines how ionic radius and charge influence the extraction and separation order of rare-earth and actinide nitrates in tributyl phosphate systems. It argues that the positions of ions in extraction separation series can largely be explained by the relative stability of their solvates, …
The paper proposes the use of continual integral representations to obtain short-wave asymptotics for stationary diffraction problems in exterior domains with smooth convex obstacles. The Green function of the stationary problem is related to the heat Green function, which is represented on a two-sh…
This study examines how foreign solid particles act as nucleating agents during crystallization of isotactic polystyrene. Experiments with inorganic oxides, organic crystals, and treated fibers show that nucleating activity depends strongly on polymer wetting of the foreign surface, while correspond…
