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
A low temperature synthesis of esters of dialkylphosphinic acids is described from alkyl dichlorophosphites and organomagnesium compounds, extending earlier work on alkylphosphinous acid esters. The reaction is carried out under nitrogen in dry ether, generally at about minus 60 degrees in the prese…
This note studies the group of divisor classes of degree zero for the function field over the rationals defined by the Fermat quartic \(x^4+y^4=1\). The argument relates the genus 3 Jacobian of the complex curve to the product of three elliptic Jacobians arising from quadratic subfields, using norm …
This paper formulates a quantitative model for the development of wind-driven currents and mass redistribution in a baroclinic ocean, with particular attention to the relative roles of density advection and vertical diffusion. Starting from layered ocean equations, the author derives governing relat…
This note studies spaces of holomorphic functions on domains in several complex variables, focusing on their topological isomorphism classes and Kolmogorov approximative dimension. Using nuclear space methods, unconditional bases, and Köthe sequence space representations, it gives explicit isomorphi…
This study investigates hydrogen isotope exchange between the adsorbed hydrogen layer on palladium cathodes and aqueous electrolytes, using deuterium and tritium labeling to compare true exchange rates with exchange currents inferred from extrapolated overvoltage and ionization curves. Experiments w…
This paper reports a total synthesis of dl-estrone from 3-methoxy-D-homoestrapentaenone, extending an earlier route to D-homo steroid intermediates. The sequence involves selective hydrogenation, ketal formation, metal-ammonia reductions, oxidative dehydrogenation, hydrolysis to methyl D-homoestrone…
This paper examines the interpretation of electronic, vibrational, and infrared absorption spectra of uranyl nitrates, with particular attention to the roles of uranyl and nitrate ion vibrations. Infrared spectra of acetone solutions of hexaaquodinitratouranyl and uranyl trinitrate are compared with…
The paper studies Korovkin-type systems for convergence of sequences of linear positive operators from the space of continuous functions on a compact set into bounded functions. It characterizes such systems by uniqueness of positive linear functionals and equivalently by a geometric condition on th…
This paper investigates the stability of the water-oil contact during water displacement of oil in layered porous media using transparent two-layer and three-layer physical models. Experiments with hydrophilic ground-glass media, kerosene and water, and layer permeability ratios from 2 to 16 showed …
This study extends a catalytic condensation method for preparing beta-arylaminoketones by reacting Schiff bases derived from 4-aminodiphenyl and aromatic aldehydes with aliphatic-aromatic ketones. Motivated by the reported physiological activity of 4-aminodiphenyl derivatives, the authors synthesize…
This paper presents a finite monotone algorithm for a generalized linear programming problem arising in Kantorovich’s model of production planning: maximizing, over a polyhedron defined by linear inequalities, the minimum of several linear forms. The method gives a geometric construction in which su…
This paper examines the electron temperature of a hydrogen medium in a stellar atmosphere or limited atmospheric volume where ionization is driven by short wavelength synchrotron radiation from relativistic electrons. Using stationarity and radiative equilibrium conditions, with photoionization from…
This paper studies the Dirichlet problem with zero boundary data for second order quasilinear elliptic equations in a strictly convex planar domain with smooth boundary. It establishes sufficient solvability conditions expressed through ellipticity, monotonicity or growth assumptions on the coeffici…
This study examines the interaction of cobalt nitrate with potassium bromide and potassium iodide in a molten lithium nitrate, potassium nitrate medium, with comparison to direct solid-phase contact of the components. Using high-temperature spectrophotometry, the authors track changes in absorption …
The paper derives formulas for evaporation from a bounded rectangular water surface while accounting for horizontal turbulent mixing both along and across the wind, together with vertical exchange and wind profiles represented by power laws in height. Using a previously introduced method that combin…
This paper studies the angular and logarithmic distribution of integer or lattice points on norm-defined curves and surfaces arising from quadratic and cubic number fields. It proves asymptotic formulas, with explicit error terms, for points on ellipses and hyperbolas of the forms associated with bi…
This paper examines macroscopic staging in the diazoaminobenzene initiated bromination of phenetole by N,N-dibromo-5,5-dimethylhydantoin in dichloroethane. Kinetic measurements show a clearly two-stage consumption of the brominating agent: a faster stage corresponding to reaction of the first bromin…
This paper proposes a temperature diagnostic for hot stars and nebulae based on the emission spectrum of N III, especially lines arising from configurations associated with the excited N IV state. It estimates photoionization probabilities for removal of 2p and 2s electrons using absorption coeffici…
This paper examines compatibility equations for the finite strain tensor under simple loading, building on Sedov’s formulation of the deformation conditions associated with such loading. The equations are rewritten in a more explicit form by using the inverse metric expression and the arbitrariness …
This paper examines transformations of the cis, trans, trans and trans, trans, trans isomers of cyclododecatriene-1,5,9 obtained by cyclotrimerization of butadiene. The authors compare catalytic hydrogenation, partial hydrogenation followed by oxidative cleavage, epoxidation with perbenzoic acid, ep…
This study examines whether prolonged aging alters the formation, composition, or structure of the gamma prime phase in nickel based Ni, Cr, W, Al, Ti alloys. Excess phases were isolated electrolytically after quenching and aging at 900 degrees for up to 10,000 hours, then analyzed chemically and by…
The paper estimates the error of a finite difference net method for the third boundary value problem for harmonic functions in a plane domain with sufficiently regular boundary and positive boundary coefficient. It constructs a difference Green function for the discrete problem, studies its boundary…
This note investigates the postcritical elastic deformation of axially compressed cylindrical shells after loss of stability and snap-through, with the aim of qualitatively describing the transition and estimating the lower critical load. The analysis approximates the deformed middle surface by an i…
This paper examines how hydrostatic pressure affects the elastic properties of cerium, with particular attention to the first-order polymorphic transition between the gamma and alpha phases. Using pulsed ultrasonic measurements of longitudinal and transverse wave transit times in annealed cerium spe…
This study examines how additions of calcium oxide affect the magnitude and character of electrical conductivity in solid solutions based on cerium and zirconium dioxides. Conductivity was measured from 500 to 1000°C for compositions of 0.75 CeO2, 0.25 ZrO2 with varying CaO content, and the ionic an…
This paper develops approximate formulas for laminar flame propagation in systems governed by branched chain reactions, including quadratic chain termination. Starting from a one active center model and earlier general relations, it derives simplified expressions for the flame velocity under assumpt…
This note develops a continuous moment problem for Hilbert spaces of square integrable functions with respect to nondecreasing measures, extending earlier work on Hilbert, Bessel, and Riesz kernels. It gives sufficient, and in a stated setting necessary, boundedness conditions under which a prescrib…
This study examines the kinetics and mechanism of the first stage of chromic acid electroreduction, focusing on the role of sulfate ions under defined hydrodynamic conditions. Polarization measurements were carried out at fixed potential on a gold rotating disk electrode in solutions containing chro…
The paper proposes an axiomatization of uniform spaces based on systems of subsets containing arbitrarily small members, called systems with small sets. It introduces majorization, regular subsystems, and cofinality, then formulates axioms intended to characterize such systems, including a separatio…
This study examines the reduction of boron trifluoride diethyl etherate with calcium hydride as a route to diborane. Thermographic analysis with simultaneous gas examination indicated that diborane evolution begins near the boiling point of the etherate, around 120 degrees, while higher temperature …
The study examines nitration of p-oxydiphenyldimethylmethane acetate, a derivative prepared from a phenol acetone production byproduct, under conditions intended to limit oxidative degradation. Direct nitration with concentrated nitric acid, especially in the presence of ammonium nitrate or at eleva…
This paper develops a frequency-domain method for approximate determination of periodic regimes in pulse systems containing nonlinear pulse elements. Assuming a linear part with low-pass filter properties, the periodic signal at the pulse-element input is approximated by its first harmonic, and harm…
A high-sensitivity relative adiabatic calorimeter was developed and calibrated to measure heat capacities of the silica gel, water adsorption system at ordinary temperatures as a function of adsorbed amount and relative vapor pressure. Measurements on fine-pored silica gel showed that the heat capac…
This study examines the electrochemical and photoelectrochemical behavior of single-crystal n-type and p-type silicon electrodes during self-dissolution in alkaline solution, with attention to surface treatment, oxidation, polarization, and illumination. Measurements of electrode potential, hydrogen…
This paper develops asymptotic weak-interaction expansions for a nonideal Bose, Einstein system using a modified thermodynamic perturbation theory based on selective diagram summation. The first approximation is formulated as nonlinear integral equations for the quasiparticle functions, from which e…
This paper reports the addition of dialkylphosphorous acids to 1,5-naphthylene diisocyanate as a route to naphthylene-1,5-bis-dialkyl esters of amidophosphonuric acid. The authors describe reactions in chlorobenzene under brief heating, promoted through sodium alkoxide formation of sodium dialkyl ph…
This paper investigates quenching processes in sensitized fluorescence of mixed trypaflavine and rhodamine B solutions, focusing on whether excited acceptor molecules can be quenched by donor molecules and how foreign quenchers affect systems with excitation energy migration. Using fluorometric meas…
Electron paramagnetic resonance spectra were studied for a series of inner-complex copper compounds, including acetylacetonate and acetoacetic ester derivatives and copper azo complexes, to examine whether the unpaired copper electron is localized or participates in molecular pi-electron systems. Th…
This study addresses the lack of reliable thermochemical data for cyclopropane hydrocarbons by measuring the heats of combustion of liquid 1,1-dimethyl-2-ethyl-, 1,1-dimethyl-2-propyl-, and 1,1-dimethyl-2-n-hexylcyclopropane at 25 °C in an isothermal-jacket bomb calorimeter. The experimental combust…
This paper develops an approximate treatment of plane one-dimensional plasma motion with finite electrical conductivity under the action of a magnetic piston. Assuming the velocity field is linear in position with time-dependent coefficients, the authors transform the magnetic induction equation to …
This study investigates frequency spectra of the vertical component of wind velocity in the atmospheric surface layer, with attention to their dependence on stability and similarity parameters. Measurements were made at 1 and 4 m over open steppe using an acoustic microanemometer and a half-octave f…
This study examines how chloride, bromide, and iodide ions affect the corrosion and passivation of 18-8 stainless steel in concentrated sulfuric acid. Dissolution rates were measured by weight loss and hydrogen evolution in 10 N sulfuric acid with added halide salts, and polarization curves were use…
This paper examines the equilibrium and settling motion of a sphere in a viscoplastic liquid with a limiting shear stress, focusing on the critical particle diameter below which gravity cannot overcome the medium’s structural strength. Using dimensional analysis, the resistance force is expressed in…
This paper gives an axiomatic characterization of semigroups embeddable in generalized groups, equivalently semigroups representable by partial one-to-one transformations. It introduces stable quasi-order relations and the strong quasi-order relation, proves that embeddability is equivalent to this …
This paper investigates the photodielectric effect in cadmium selenide at low temperatures, focusing on changes in active and reactive conductivity under optical excitation. Using a bridge method that separately measured conductivity components in CdSe powder embedded in epoxy, the authors observed …
This study examines how modifying additives affect the electron work function of oxide semiconductors, a surface property relevant to adsorption and catalytic behavior but not directly inferred from bulk electrical conductivity. Using contact potential difference measurements by the vibrating conden…
This study uses oxygen-18 labeling to investigate the mechanisms of ortho and para isomerization of azoxy compounds and the interconversion of azoxy isomers. Labeled azoxybenzenes and substituted azoxy compounds were rearranged in labeled and unlabeled sulfuric acid, chlorosulfonic acid, acetic anhy…
This study examines the previously little known niobium tellurium system through samples prepared by prolonged sintering of elemental niobium and tellurium in evacuated quartz ampoules. X-ray diffraction, supplemented by measurements of electrical conductivity and thermoelectromotive force on presse…
This study examines how substituents bonded to silicon affect the reactivity and Si-H bond properties of alkylchlorosilicon hydrides. Using competitive photochemical chlorination with sulfuryl chloride and Raman measurements of Si-H stretching frequencies, the authors compare a series of mono- and d…
This paper studies linear methods for summing Fourier series of periodic summable functions, defined by triangular matrices of multipliers. It proves a general bound for the associated kernels and derives necessary and sufficient conditions under which the transformed Fourier polynomials converge to…
