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 paper addresses the selection of final steam pressure in steam turbine units for thermal power plant design, especially where turbines operate under local fuel and water supply conditions not matching standard condenser parameters. It develops an economic calculation method for once-through coo…
The paper derives the steady temperature distribution in an infinitely long body with an elliptical cross-section and uniform internal heat generation, subject to convective heat transfer to a surrounding medium at zero temperature. Using elliptic coordinates, Poisson’s equation is transformed into …
This paper investigates heat transfer during dropwise condensation of slightly superheated steam on a brass tube at atmospheric pressure, addressing conditions closer to industrial heat exchangers than earlier studies on copper or chromium-plated surfaces. Experiments varied cooling-water velocity, …
This paper proposes a methodological reconstruction of how the second law of thermodynamics should be justified and presented in an engineering thermodynamics course. It argues for separating the principle of the existence of entropy from the principle of entropy increase, deriving the former from t…
This paper treats unsteady heating of an infinite plane plate by thermal radiation, where nonlinear radiative boundary conditions make a closed explicit solution difficult. The authors reduce the heat conduction problem to determining the time dependent temperatures of the two plate surfaces, approx…
This paper examines how temperature effects on measuring wires can be eliminated or reduced in medium-accuracy field polygonometry, where direct measurement with wires or tapes remains necessary despite the development of electromagnetic rangefinders. It compares invar and steel wires, reviews the p…
This paper examines the mechanics of chip formation in metal cutting, with particular attention to contact stresses on the tool rake face and their relation to chip compression, friction, and cutting conditions. It formulates a simplified elastoplastic contact model, solved using complex-variable el…
This paper examines quantitative relationships among major chemical components in iron ores from the Tashtagol deposit, with attention to their practical significance for ore characterization, averaging, and metallurgical use. Using correlation analysis and graphical comparisons of chemical assays, …
The paper studies boundary value problems with shift for analytic and piecewise analytic functions on closed abstract Riemann surfaces and on domains bounded by smooth Jordan contours. It proposes reductions of several Haseman, Hilbert, and Carleman type problems to the classical Riemann problem on …
The paper critiques a proposed formula for determining the absolute index of variability of a deposit property and the analogy error using second differences on a square exploration grid. It argues that reducing second differences from diagonal intervals to side intervals assumes an unjustified line…
This paper addresses the practical problem of assessing the accuracy of points determined by forward intersection, for which existing analytical procedures are described as cumbersome and therefore often unused. It derives coordinate and directional mean-square error expressions in terms of side acc…
This paper examines the relationships between sulfur, zinc, and iron contents in magnetite ores from the Temir-Tau and Sheregeshevo deposits, where sulfur and zinc occur mainly as sulfide minerals and represent harmful impurities for metallurgical use. Using chemical assay data from mine laboratorie…
This paper examines chemical relationships among major components of iron ore skarns at the Tashtagol deposit, where ore bodies grade into enclosing skarns and mining dilution affects ore quality. Using chemical analyses, correlation coefficients, graphs, and empirical formulas, it evaluates how SiO…
This paper addresses the preliminary calculation of projection error in mine orientation through a single vertical shaft, focusing on the effects of air flow on plumb-line wires and the selection of load and wire diameter. It derives an empirical relation for air pressure on the wire as a function o…
This paper examines the permissible error in orienting underground mine surveys through a single vertical shaft and argues that the uniform tolerance then prescribed by technical instructions is inadequate. It critiques the fixed requirement that two independent orientations differ by no more than 3…
The paper addresses the repeated calculation of root-mean-square errors in horizontal angle measurements arising from improper centering of a theodolite and survey signals, a task important in assessing mine-surveying accuracy. It reformulates the standard error equation into tabulated components an…
This paper proposes a simple ruler-palette for determining areas on plans, intended as an alternative to square and parallel palettes or a planimeter, especially where portability and ease of use are important. The method approximates a contour by summing circular sectors formed by successive radius…
This paper examines formulas used in mine surveying to solve connecting triangles and argues for the general use of the tangent formula proposed in earlier work. By comparing error expressions for tangent, sine, and side formulas, and by accounting for the lower measurement accuracy of the distance …
This article addresses the rapid, lower-precision orientation of secondary mine workings, where conventional connection to plumb lines by a connecting triangle is considered too laborious and computationally cumbersome for underground conditions. It presents several alternative orientation and conne…
This study examines the accuracy of calculating dump volumes from contour-line plans using the volumetric grid method and the methods of vertical and horizontal sections. Based on repeated determinations for two dump variants at a plan scale of 1:500, with different contour intervals and grid sizes,…
The paper addresses the problem of determining monthly ore output and mine car weights by production block at iron ore mines that lack weighing facilities. It argues that the common practice of distributing the discrepancy between statistical and actual mine output in proportion to recorded block ou…
This paper examines control computations for adjusting newly inserted points in a fixed mine triangulation network by the method of indirect measurements, with particular attention to transformations of direction error equations according to Schreiber’s rules. It argues against the view that the sta…
This paper addresses preliminary error estimation in mine surveying where underground theodolite traverse sides vary widely in length, making horizontal angle measurements unequal in accuracy. It transforms standard formulas for angular, centering, distance, orientation, and breakthrough errors into…
This study examines how cold plastic deformation affects the fine substructure of high-purity molybdenum single crystals produced by electron-beam zone melting. Using Laue orientation, electropolishing, electrolytic etching, microhardness measurements, and staged room-temperature rolling, the author…
This note studies which general recursive functions can serve as measures of algorithmic complexity for partial recursive functions under principal numberings. It defines complexity as the minimum value of a recursive function over all program numbers computing a given function, proves a lemma allow…
This paper develops a theoretical treatment of the electrodissolution of thin films of sparingly soluble compounds formed on an indifferent electrode by products of an electrode reaction and a solution component. Assuming rapid chemical equilibration and negligible diffusion of the solid phase, the …
This study reexamines the formation of dialkyl peroxides during low-temperature radiation oxidation of hydrocarbons, using isooctane and n-heptane as model systems. By combining polarographic determination of hydroperoxides with iodometric measurement of total peroxide compounds, and by measuring al…
This paper develops a model for the combustion of liquid or melting nonvolatile explosives in which decomposition in the condensed phase produces gas bubbles, causing foaming, volume expansion, and subsequent aerosol dispersion. Using assumptions on ideal-gas behavior in the foam, effective thermal …
This paper examines structural and reactivity features of barene compounds of the type B10H10C2RR' using infrared spectroscopy, nuclear quadrupole resonance data, and selected chemical observations. The IR spectra indicate the absence of bridging B-H-B hydrogens, distinguish C-H, B-H, B-B, B-Cl, and…
This paper examines the relationship between the high-temperature specific electrical conductivity of potassium-bearing minerals and rocks and their geological age. More than 200 samples, including micas, feldspars, and rocks, were heated while their electrical resistance was measured, and conductiv…
This paper examines the stability and cleavage behavior of 1,2-disulfones of 3,3-dimethylbutane bearing alkyl or phenyl sulfonyl substituents, with attention to the steric influence of the tert-butyl group. The authors synthesize these disulfones by oxidation of corresponding dithioethers and study …
The study examines how confinement and surface condition affect the heat capacity of liquids in disperse systems, using nitrobenzene and benzene in contact with glass powder, silica gel, and potassium iodide powder. Heat capacities were measured between 10 and 80 degrees Celsius with an adiabatic ca…
This paper develops an approximate treatment of hypersonic flow past plane wings at large angles of attack, using a simplified integral-relations formulation analogous to the shallow-water approximation for the thin compressed layer between the shock and the windward surface. The governing equations…
This paper develops and applies an approximate method for estimating absolute rate constants of fast radiation chemical reactions in aqueous solutions under pulsed electron irradiation. The approach combines two kinetic treatments of dose-rate-dependent product yields: one based on stationary concen…
This paper formulates the optimal staging problem for multistage rockets as a Bolza-Mayer variational problem in which the control functions have known forms between discontinuities, while the discontinuity times are to be determined. Using Lagrange multipliers, it derives necessary extremum conditi…
The paper establishes Weyl-type asymptotic formulas for the eigenvalue counting function of self-adjoint elliptic operators of arbitrary even order in Euclidean space with a confining potential. Under regularity, ellipticity, growth, and Tauberian conditions on the leading coefficients and on the po…
This note addresses the existence of abelian subgroups of infinite rank in locally solvable groups, focusing on periodic groups and related locally nilpotent cases. It proves that every periodic locally solvable group of infinite rank contains an abelian subgroup of infinite rank, using bounds on th…
The paper studies a Riemann-Hilbert boundary-value problem for a holomorphic vector in a three-dimensional half-space, with Hölder-continuous boundary coefficients and boundary data in appropriate Lebesgue classes. Using an integral representation of holomorphic vectors, the problem is reduced to a …
The paper gives a kinematic interpretation of a previously obtained solution for the motion of a rigid body with a fixed point, using dimensionless variables for the angular velocity and direction cosines. It derives the moving and fixed hodographs of the angular velocity, showing that the moving ho…
The paper studies spectral functions for generalized second order differential systems associated with string operators when a boundary condition is imposed at a singular left end. It relates the behavior of the mass distribution function near negative infinity to the high energy growth of spectral …
This study examines the thermal degradation mechanism of polyethylene terephthalate and related ester model compounds under vacuum at elevated temperatures. Molecular weight changes, volatilization kinetics, product analysis, spectroscopy, and comparisons with glycol dibenzoate and other esters are …
This study addresses conflicting views on the hydration number and geometry of copper(II) ions in dilute aqueous solutions. The authors compare electronic absorption spectra of dilute aqueous solutions of copper(II) perchlorate, sulfate, and chloride with spectra of crystalline copper aquocomplexes …
The crystal structure of racemic ammonium antimonotartrate, d,l-(NH4)2[Sb2(C4H4O6)2]·4H2O, is examined to clarify the constitution of antimony tartrate complexes and their relation to isomorphous rubidium salts. X-ray diffraction data were treated in the centrosymmetric space group C2/c using Patter…
This study examines the structure of the electrical double layer at the mercury solution interface during cathodic initiation of methyl methacrylate polymerization in sulfuric acid. Using differential capacitance measurements on dropping and hanging mercury electrodes, the authors analyze monomer ad…
This paper reports an experimental observation of quantum oscillations in the contact potential difference of a bismuth, niobium pair in a pulsed magnetic field, motivated by theoretical predictions that the chemical potential of metals with small carrier groups should oscillate measurably. A capaci…
This study examines how polar substituent effects influence the homolytic abstraction of alpha hydrogen atoms and subsequent radical recombination in the polyrecombination of substituted diphenylmethanes. Diphenylmethane derivatives and corresponding tetraphenylethane dimers bearing electron donatin…
This paper examines the structure of acid salts of 3-acetylpyrrole derivatives and related dipyrrylmethanes, addressing earlier proposals that their acid-catalyzed reactivity arises from pyrrolene forms with active methylene character. Using infrared spectral data for hydrochlorides prepared from ac…
