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 examines how the position of the double bond in 3,4-dimethylphosphacyclopentene derivatives depends on the phosphorus halide reagent and the synthetic route. Derivatives prepared from 2,3-dimethyl-1,3-butadiene with phosphorus chlorides or bromides were converted to acids, halogen anhydri…
The study examines phase relations in the spinel region of the Mg, Al, Fe, O system, focusing on solid solutions MgAl2-xFexO4 and the hydrogen reduction of MgAl0.25Fe1.75O4 at 1000 degrees C. Ceramic synthesis, quenching, gas equilibrium measurements, and X-ray diffraction were used to determine lat…
This paper examines the relationship between electron paramagnetic resonance and electrical conductivity in radiation thermally modified polyethylene products subjected to vacuum thermal treatment at different temperatures. By comparing measured concentrations of paramagnetic centers with carrier co…
This study examines how supramolecular structure influences the ultrasonic destruction of polymer films, focusing on amorphous polyvinyl chloride and crystalline polyethylene and polypropylene. Films were irradiated in water with focused 22 kHz ultrasound, then inspected by polarization microscopy t…
This paper addresses numerical calculation of high-speed three-dimensional flow past blunt bodies when equilibrium physicochemical reactions in the gas affect the thermodynamic properties. It introduces an effective isentropic exponent as a function of pressure and density and proposes a compact app…
This study examines how added electrolytes affect the adsorption of ionic dyes by radioactive and inactive barium sulfate precipitates, with attention to the role of surface charge produced by beta emission from sulfur-35. Radioactive BaSO4 samples of different specific activities were equilibrated …
This study examines the spectroscopic evidence and energetics of intramolecular hydrogen bonding in thiosalicylic acid, with comparison to salicylic acid, using infrared spectra of carbon tetrachloride solutions in the carbonyl and sulfhydryl stretching regions. Concentration-dependent spectra indic…
The paper studies parametric invariance in linear dynamical systems, asking when a scalar output remains unchanged under variations of the system matrix. For a system with constant coefficients, it derives necessary and sufficient algebraic conditions requiring the perturbation matrix to be annihila…
This paper develops an asymptotic treatment for a fourth-order differential equation with two small parameters arising in hydrodynamic stability and related wave problems in weakly inhomogeneous media. It examines the failure of standard WKB approximations near zeros of both coefficient functions an…
This study examines the assignment of the three dissociation constants of tetracycline antibiotics to specific functional groupings, a question left ambiguous by earlier model compound and titration studies. Using infrared spectra of tetracycline, oxytetracycline, chlortetracycline, and selected der…
This study applies tin-119 Mössbauer spectroscopy to the unresolved structural problem of organic divalent tin compounds, focusing on diphenyltin and dibutyltin absorbers cooled with liquid nitrogen. Although divalent tin compounds were expected to show chemical shifts distinct from tetravalent orga…
This paper examines the distribution of unpaired electron spin density in metal ketyl radicals containing methyl groups, with emphasis on hyperconjugation as the source of observed EPR hyperfine structure. Using an LCAO molecular orbital approach, the authors model C-H hyperconjugation in di-p-tolyl…
Low-temperature heat capacities and thermodynamic functions were measured for endo- and exo-2-methyl-bicyclo-(2,2,1)-heptane in the range 12 to 310 K using an adiabatic calorimeter. Numerical integration of smoothed heat-capacity curves gave entropies and enthalpy increments, and solid-phase transfo…
This paper examines the nature of the reducing particle produced during radiolysis of water and aqueous solutions, addressing whether it behaves as atomic hydrogen or as a hydrated electron, polaron-like species. The author tests predicted kinetic differences by measuring hydrogen peroxide formation…
The study examines how high dielectric constant solvents affect the thermodynamic behavior of strong electrolyte solutions, focusing on NaCl and CsCl in N-methylformamide and CsCl in formamide at 25 °C. Activity coefficients were determined mainly from electromotive force measurements with silver, s…
This study examines the structure of the p-N,N-dimethylaminophenyldiazonium cation, whose spectral behavior and stability differ from typical aryldiazonium cations. Using ultraviolet and infrared spectroscopy, the authors investigate p-N,N-dimethylaminophenyldiazonium borofluoride in water and acids…
This note addresses the minimization of a concave function over a convex polyhedron, a problem in which local minima need not be global. It proposes a finite procedure based on two observations: a minimum, when it exists, is attained at a vertex, and a suitable concave extension can be used to exclu…
The paper studies sums over Dirichlet characters of powers of Dirichlet L-functions in the critical strip and their application to the distribution of products of integers in arithmetic progressions. Extending methods of Yu. V. Linnik, it obtains uniform estimates for sums of |L(1 minus 1/k plus it,…
This paper reports the synthesis of organosilicon compounds containing thienylenecarbon units in the main chain through the preparation and reactions of dihydridethienylenesilanes. 2,5-Di-(methylphenylsilyl)thiophene and 2,5-di-(ethylphenylsilyl)thiophene were obtained by organomagnesium synthesis f…
This study examines whether the increased electrical conductivity and reduced activation energy observed in polymer pyrolysis products can be attributed to the formation of conjugated double bonds, using polyvinyl alcohol as a test case. Polyvinyl alcohol powders were pyrolyzed in air and inert atmo…
This paper examines intramolecular donor acceptor interaction in substituted indandione 1,3 derivatives, motivated by the differing anticoagulant activity of 2-benzyl-alpha-phenacylindandione and 2-benzylindandione. The authors compare halogenation, iodination, and alcoholysis reactions of related b…
This paper studies infinite-order differential equations with polynomial coefficients whose degrees may grow linearly but with ratio less than one. Under summability conditions on the coefficients, it establishes solvability results in classes of entire functions of prescribed order and type, includ…
This study examines changes in the Raman scattering spectrum of alpha quartz irradiated by fast neutrons with integral fluxes of 4, 5, and 7 x 10^19 n/cm2. Photoelectric measurements show decreasing and broadening Raman line intensities, shifts toward lower frequencies, and growth of a continuous sc…
This note studies homotopy classifications of mappings between Banach spaces that differ from Fredholm operators by completely continuous operators, and relates these classifications to stable homotopy groups of spheres. It defines admissible mappings on balls and more general metric pairs, proving …
This paper presents a thermodynamic treatment of ferrite dissociation in the case where magnetite, one solid dissociation product, forms a continuous solid solution with the initial ferrite, while the second solid product has constant composition. Using the equilibrium oxygen pressure as a function …
This paper reports the synthesis and characterization of the previously undescribed mixed nitroammine nitrosoruthenium complex diamminedinitrohydroxonitrosoruthenium, [RuNO(NO2)2(NH3)2OH], prepared from sodium tetranitrohydroxonitrosoruthenium in concentrated ammonia. Elemental, crystallo-optical, c…
This note formulates a general framework for computational and real computational algorithms for approximate solutions of linear operator equations in normed spaces, distinguishing approximation of the operator equation from finite precision implementation. It defines regular convergence, convergenc…
This paper studies locally bicompact topological groups under three types of conditions: minimality for closed abelian subgroups, purity in the sense of absence of bicompact elements, and completeness. Using structural results related to the Cartan, Mal'cev, and Iwasawa theorem, together with projec…
This note generalizes Volterra type integral equations from intervals or rectangles to arbitrary open subsets of n-dimensional space by defining classes of supports for square integrable Fredholm kernels that have no eigenvalues. It introduces sets of type V and proves a necessary and sufficient con…
This note studies normal isogonal decompositions of three-dimensional Euclidean space associated with a group of parallel translations, a setting previously treated mainly for isohedral translational decompositions. It proves that such a decomposition is centrally symmetric with respect to every poi…
This paper investigates the emission spectrum of a room temperature ruby optical generator with external spherical mirrors in regimes of undamped intensity oscillations and quasi-stationary generation. Using a Fabry Perot interferometer with time sweep, the authors compare concentric and confocal re…
This note studies a mixed boundary value problem in a half-space for constant-coefficient systems that are parabolic in the sense of Petrovskii and may contain time derivatives of order higher than one. Under a stated regular solvability rank condition, the problem is transformed by Fourier and Lapl…
This paper studies the stability of controlled processes described by linearized differential equations coupled to a linear automatic control system with time-varying parameters. Instead of relying on the usual method of freezing the parameters of the controlled object and controller, it introduces …
The paper examines the gas phase thermal decomposition kinetics of N,N-dimethylnitroamine over approximately 180 to 260 °C using a manometric method, with attention to minimizing complications typical of condensed phase nitro compound decomposition. The reaction is found to proceed in two first orde…
This paper examines the radiation chemistry of polyisobutylene, focusing on the accumulation, structure, and reactions of free radicals formed under gamma and electron irradiation at different temperatures. Using EPR spectroscopy together with evidence from degradation products, gas evolution, doubl…
This paper reports the discovery and experimental study of oxygen photosorption on polycrystalline cadmium sulfide powders under vacuum. Using pressure measurements during illumination, the study examines reproducibility, thermal treatment, temperature dependence, light intensity dependence, and spe…
This paper formulates numerical weather forecasting for a spherical Earth using a three-dimensional baroclinic atmospheric model in spherical coordinates, with appropriate dynamical, thermodynamic, continuity, and hydrostatic relations. It transforms the equations to local coordinates suited to a la…
This paper characterizes regular distributive structures in terms of the exponential topology on the underlying lattice. For a Urysohn structure, it proves that regularity is necessary and sufficient for the inclusion relation set of pairs satisfying x contained in y to be closed in the product expo…
The study examines the kinetics and mechanism of reduction of aqueous potassium tetrabromopalladate(II) by carbon monoxide, a reaction relevant to palladium complex catalysis. Rates of carbon monoxide absorption and carbon dioxide evolution were measured under varied temperature, carbon monoxide pre…
This paper classifies commutative symmetric algebras of bounded linear operators in the Pontryagin space \(\Pi_1\) with an indefinite inner product, up to equivalence. Using invariant nonnegative one-dimensional subspaces, the analysis separates the problem into three cases according to whether such…
This study examines the isomerization behavior of S-allylthiolactams containing five- and seven-membered rings, with attention to Claisen-type rearrangements of the N=C-S-allyl system. Heating S-allylthiopyrrolidone in chlorobenzene gave N-allylthiopyrrolidone, while heating the same compound in die…
The paper analyzes nonlinear mechanisms by which intense high-frequency transverse radiation interacts with a plasma that would be transparent in linear theory. Using resonance conditions and kinetic estimates for decay, coalescence, and induced scattering processes, it derives probabilities and gro…
The paper proposes a solution-based method for obtaining macrocyclic compounds from linear heterochain polymers capable of exchange reactions. The authors argue that dilution shifts the equilibrium from polymerization toward intramolecular destruction and cyclic oligomer formation, and examine this …
This paper develops a rheological theory of thixotropy in condensed polymer systems, treating thixotropy as a reversible, time-dependent change in structure and properties under mechanical deformation. The authors model a thixotropic viscoelastic medium as parallel Maxwell elements whose structural …
This paper investigates the synthesis of high-purity calcium borohydride by exchange reaction between calcium chloride and sodium borohydride, with emphasis on the solubility behavior needed to separate products and solvates. Pyridine was used as the reaction medium, followed by extraction and recry…
The study examines the equilibrium reduction of monocalcium and dicalcium ferrites by hydrogen at 900 degrees C, addressing conflicting descriptions of whether monocalcium ferrite reduction proceeds through variable or constant composition phases. Using a vacuum equilibrium method and X-ray phase an…
This paper develops an area method for the theory of univalent functions, centered on a system of functions defined through logarithmic expansions associated with mappings in the class of functions univalent outside the unit disk. Using a generalized external area theorem, it establishes orthogonali…
