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
The paper develops an algebra of irreducible tensor operators for cubic point groups as an analogue of the familiar spherical tensor algebra used in angular momentum theory. It defines irreducible cubic tensors by their transformation properties, applies the Wigner-Eckart theorem to their matrix ele…
This paper examines the damping of long-wavelength Langmuir waves in a homogeneous isotropic plasma near the threshold at which they can emit ion-sound plasmons and transition to lower-frequency Langmuir states. Using a Hamiltonian with a three-plasmon interaction term and retarded two-time Green fu…
This paper reports the preparation and characterization of two positional isomers of chloroamminemethionineplatochloride, [NH3ClPtMtH]Cl, a type of platinum(II) complex with one chelated methionine ligand and two different monodentate ligands. The synthesis exploits the different trans influences of…
This paper examines the mechanism by which organic acids accelerate free-radical formation during hydroperoxide decomposition in the liquid-phase oxidation of paraffin hydrocarbons. Using oxidized n-decane containing hydroperoxides, caproic acid additions, inhibition by alpha-naphthol, and kinetic m…
This paper studies how pointwise cardinal bounds on systems of open sets in a topological space control their total cardinality, using the notion of a t-pseudobase. It proves that a t-pseudobase of a countably compact space is countable if it is point-countable on an everywhere dense subset, general…
This paper examines radiative losses in spectral lines from a finite volume of nonequilibrium plasma, accounting for non-Boltzmann level populations and reabsorption. Using a two-level model, the authors formulate the problem in terms of the integral flux of escaping quanta rather than the full radi…
This paper examines equilibria in the reactions of sodium and lithium with diphenyl and naphthalene in electron donor solvents, focusing on how cation solvation controls radical anion and dianion formation. Equilibrium constants, enthalpies, and entropies were obtained spectrophotometrically for sod…
This paper describes the use of phenylboronic acid as a temporary protecting group for the 2′,3′-cis-glycol of adenosine in the selective synthesis of adenosine 5′-monophosphate. The authors prepare crystalline 2′,3′-phenylboronate adenosine by azeotropic removal of water in pyridine, phosphorylate …
This chronicle reports on the Third All-Union Symposium on Wave Diffraction, held in Tbilisi in September 1964, and summarizes its organization, plenary lectures, sectional sessions, and main scientific themes. The account surveys work on electromagnetic, acoustic, hydrodynamic, elastic, plasma, wav…
This study examines the stability and reaction pathways of β-(N-ethylenimino)ethylsilanes under elevated temperatures and in the presence of nucleophilic and electrophilic reagents, with attention to possible β-cleavage of the silicon-carbon bond and transformations of the ethylenimine ring. Triethy…
This paper analyzes a corrected gyrocompass in which an astatized gyroscope is mounted on a horizontally stabilized platform and brought to the meridian by applied correcting torques. Equations of precessional motion are derived for a moving vehicle on the rotating Earth, and a torque law using meas…
This study examines the corrosion behavior of titanium oxygen alloys containing 1 to 36 atomic percent oxygen in 40% and 70% sulfuric acid, under conditions where unalloyed titanium corrodes rapidly. Alloys were prepared by arc melting, annealed, and evaluated through corrosion-rate measurements bas…
The paper determines the crystal structure of dumortierite, an orthorhombic aluminum borosilicate, using single crystal X-ray diffraction data from Weissenberg photographs and analysis of Patterson and electron-density projections. Systematic absences, absence of piezoelectricity, statistical tests,…
The paper studies absolute stability and dissipativity of a nonlinear control system whose linear part is Hurwitz and whose single differentiable nonlinearity satisfies sector and derivative bounds. It derives frequency-domain criteria, expressed through the transfer function of the linear part and …
This paper studies the dynamic stability and flutter of a thin three-layer straight circular conical shell supported at its ends, with a rigid transverse-shear-resistant core and exposed to external potential supersonic flow. Using linear piston theory for aerodynamic pressure and shallow-shell equa…
The paper develops a direct method for deriving relations among matrix elements of irreducible tensor operators of the group SU(3), avoiding explicit elimination of arbitrary reduced parameters. Using transformation properties, invariant operators, and the action of SU(3) generators, it establishes …
This paper examines how large mountain ranges affect atmospheric humidity, using the Main Caucasus Range as a case study. The authors compare long-term meteorological station data and parallel radiosonde observations from summer 1957 across stations north and south of the range, estimating vapor pre…
tert-Butyl β-(trimethylsilyl)perpropionate was synthesized from β-(trimethylsilyl)propionyl chloride and the sodium salt of tert-butyl hydroperoxide in yields up to 60 percent, and its decomposition was examined to assess the behavior of silicon-containing radicals. Reactions in cumene, chlorobenzen…
This study examines the spectropolarimetric behavior of optically active alpha-phenylethylamides of pyridinecarboxylic acids, focusing on how the position of the carboxamide group in the pyridine ring affects optical rotatory dispersion. The authors synthesized amides of picolinic, nicotinic, isonic…
This note gives an analogue of the Plancherel formula for the real unimodular group of third order. It describes two series of irreducible unitary representations of the group, including a principal series acting on analytic and measurable functions on a specified manifold and a second series acting…
This paper reports on the 15 February 1965 earthquake near Kamen-na-Obi in Altai Krai, where observed intensity reached about 7, locally 7 to 8, despite the area being assigned to a 5-point seismic zone. The authors combine instrumental records from Soviet seismic stations with field observations in…
This paper develops a nonlinear theory of the Zeeman effect in a helium-neon gas laser, addressing the experimentally observed anomalous magnetic-field region where the beat frequency between oppositely circularly polarized oscillations can vanish. Lamb’s laser theory is generalized to two polarizat…
This study examines the synthesis and reactivity of phosphorus-containing hydrazo and azo compounds, focusing on tetraalkyl esters of hydrazodiphosphonic and azodiphosphonic acids. Tetraalkyl hydrazodiphosphonic esters with ethyl, butyl, hexyl, and octyl groups were prepared from dialkyl chlorophosp…
The study examines the structure and thermal decomposition of cyclic and linear polymers formed from dimethyldichlorosilane or dimethyldichlorogermane with lithium in tetrahydrofuran. Infrared and NMR spectroscopy, mass spectrometry, microreactor gas-liquid chromatography, and thermogravimetry are u…
The paper compares the reactivity and stability of the three-membered ring in norcarane, substituted norcaranes, and related cyclopropane derivatives under electrophilic addition of mercuric acetate in methanol. Using the extent of reagent consumption as a measure of relative reactivity, the authors…
This paper examines the synthesis and catalytic hydrogenation of 2-phenylethylenimine as a carbon-substituted ethylenimine, motivated by earlier observations that related aziridine rings undergo hydrogenolysis under mild conditions. The authors develop a preparation from styrene oxide through amino …
This study examines chlorine isotopic exchange in Koss-type platinum(II) salts, specifically potassium trichloroammineplatinate and its pyridine analogue, in order to test whether coordinated chlorine ligands are kinetically equivalent. Exchange experiments with radioactive chloride were analyzed fr…
This paper addresses the difficulty of assigning structures to isomeric dialkylbenzenes when boiling points, elution order, or conventional gas chromatographic retention relationships are insufficiently diagnostic. The authors propose using a coefficient defined as the ratio of relative retained vol…
This study examines the radiation-induced addition of molecular nitrogen to simple perchlorocarbons, chiefly tetrachloroethylene and carbon tetrachloride, chosen to simplify product interpretation and exclude nitrogen-hydrogen-containing starting structures. Purified samples were irradiated with cob…
The study examines the kinetics of catalytic dehydrogenation of butane to butylenes over an alumina, chromia, potassium catalyst using a flow circulation method with a moving catalyst bed, designed to reduce errors associated with variable catalyst activity. Experiments varying space velocity, conve…
The paper studies nonlinear parabolic type equations in a real Hilbert space with time dependent positive self-adjoint operators, monotone damping operators, and nonlinear potential or nonpotential terms. Using energy inequalities for the operator norm induced by the square root of the principal ope…
This paper addresses the separation of 4-vinylpyridine from mixtures of pyridine bases obtained in the catalytic dehydrogenation of 4-ethylpyridine, a process complicated by close boiling points and the tendency of vinyl compounds to polymerize during rectification. The authors propose isolating 4-v…
The paper examines plastic flow in a thin layer compressed between elastic bodies, where pressure in the layer is coupled to elastic displacements of the bounding surfaces through Green’s functions. It formulates the governing problem as a system consisting of a nonlinear first order pressure equati…
This paper studies finite groups through the conjugacy classes of their nilpotent maximal subgroups. It proves that a finite nonnilpotent group has at most two such classes, and characterizes the case of two classes as an extension of a nilpotent group by a group of type A, with specified action con…
This paper examines anomalous temperature dependences in the low-temperature photopolymerization of styrene, including cases without a sensitizer and sensitized systems using diacetyl. From rate measurements, inhibition experiments with quinone, viscosity studies of polymer solutions, and comparison…
This paper examines the formation of large crystalline structures in isotactic polypropylene crystallized from very dilute decalin solutions under controlled solvent evaporation. Using electron microscopy, the authors describe fibrillar dendrites composed of 10 to 20 Å fibrils, interpreted as bundle…
This paper studies level lines arising from regular univalent conformal mappings in the unit disk, focusing on conditions under which an arc of such a level line is star-shaped. Using a method developed in earlier work, it determines the value domain of a functional involving the logarithm of the de…
This paper reports the preparation and preliminary characterization of ethylenediamine tetrammine complexes of tetravalent palladium, a class previously little known because of the ready reduction of Pd(IV) in solution. Oxidation of divalent palladium ethylenediamine complexes with nitric acid, chlo…
The paper defines a sequent calculus J0 for constructive predicate logic that omits structural inference rules and modifies implication, negation, and quantifier rules to better support proof search. It compares J0 with the standard constructive calculus G1, showing that they are not equipollent in …
This paper addresses the problem of estimating isotropic mean values of tensor physical quantities from anisotropic single-crystal constants, especially when conventional angular averaging gives different results for direct and reciprocal tensors. It proposes an averaging method based on equating ro…
This study examines lactim and lactam tautomerism in free molecules by measuring infrared spectra of vapors, using alpha-pyridone and delta-valerolactam, including N-deuterated derivatives, as representative unsaturated and saturated lactams. The authors recorded O-H, N-H, O-D, and N-D stretching ba…
The study examines the structures of the bisbenzylisoquinoline alkaloids thalmine and thalmidine isolated from Thalictrum minus. Using infrared spectra, alkylation, acetylation, sodium in liquid ammonia cleavage, Hofmann degradation, and oxidative transformations, the authors identify several cleava…
This study applies Mössbauer spectroscopy to a series of tetravalent and divalent organotin derivatives of barenes in order to evaluate how barenyl substituents affect the electronic environment of the tin nucleus. Measurements of isomer shifts and quadrupole splittings at 77 K show that barenyl gro…
The paper reports an X-ray crystallographic determination of the structure of alpha-trichloromethyl-N-methylolethylenimine, C4H6ONCl3, an ethylenimine derivative described as an active chemical mutagen. Unstable single crystals grown from ether were protected from sublimation and examined by Weissen…
This paper analyzes how slow nonradical reactions affect the existence and stability of stationary regimes in chain thermal processes with radical production and consumption. A nonlinear reaction diffusion model with heat release, reactant depletion, and small zeroth order radical generation is redu…
This paper studies relations between the best polynomial approximation of analytic functions of several variables and the coefficients of their orthogonal expansions. Using mean square approximation in a cube with weight, the author proves lemmas identifying generalized Fourier coefficients as optim…
The paper proposes a numerical method for Fredholm integral equations of the second kind that separates the choice of interpolation points for the unknown function from the quadrature points used to approximate the kernel integral. The method forms a linear system only at selected points for the sol…
This paper examines whether complete esters of phosphorous acid bearing saturated radicals can undergo thermal rearrangement to alkylphosphinic acid esters, in light of conflicting earlier reports. The authors heat purified lower trialkyl phosphites and compare them with unpurified materials and mix…
