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 paper analyzes the apparently complex magnetic field of the Darasun gold deposit in Transbaikalia using high-precision measurements of the vertical magnetic component along multiple profiles. Autocorrelation and spectral-density analysis are applied to distinguish relatively homogeneous field t…
This paper examines the form and origin of magnetic anomalies associated with quartz sulfide veins at the Darasun ore deposit. Using high precision magnetic profiling across multiple veins, it evaluates anomaly amplitude, width, and probable field form, showing that most anomalies are reduced vertic…
This paper addresses the design of a magnetic survey network for detecting quartz and quartz sulfide gold ore veins at the Darasun deposit, where target anomalies are weak, elongated, and difficult to distinguish from other magnetic-field variations on single profiles. Using an inverse-probability d…
This paper examines the position of the oil water contact in horizon A-1 of the Vartov Formation at the Sovetskoye oil field, where testing of intervals above the initially accepted contact produced formation water or oil with water. Using field geophysical interpretation, formation tester data, lim…
The paper examines competing principles for identifying ore formations in ore deposit classification, focusing on geochemical, mineralogical, and metallogenic approaches. It argues that geochemical and purely mineralogical criteria either group geologically dissimilar deposits too broadly or subdivi…
This paper examines the petrographic composition and stratigraphic setting of coals from the Tataurovo deposit in Chita Oblast, based on borehole core descriptions, petrographic analysis, spore and pollen study, granulometric analysis, and mineralogical examination of enclosing rocks. The authors ch…
This paper develops continued fraction methods for evaluating incomplete gamma type integrals with complex exponential factors, especially integrals of \(t^{\gamma-1}e^{-ct}\) and their real and imaginary parts involving cosine and sine. It derives even and odd rational approximations from continued…
This paper develops continued fraction approximations for numerical evaluation of the beta function. Starting from a hypergeometric representation of the beta function, it rewrites the function as a sum of two hypergeometric terms at argument minus one and replaces each term by convergents of a know…
This paper develops continued fraction based rational approximations for computing the gamma function by splitting its defining integral at the point y = x. It derives and tabulates convergents for the two resulting incomplete integral representations, then combines selected approximants and estimat…
This paper develops continued fraction based approximations for computing elliptic integrals. It proves that even convergents of a Padé-type expansion of the power function can be decomposed into a finite sum of elementary fractions, using the relation of their denominators to Chebyshev polynomials,…
This paper examines degenerate cases of the hypergeometric differential equation, where one of the parameters is an integer and standard tables give solutions that may be rational, polynomial-type, or logarithmic after continuation. It derives representations of second linearly independent solutions…
The paper develops a continued fraction based approximation for Appell’s hypergeometric function of two variables, expressed through its double integral representation. Under specified real parameter restrictions, the function is represented as a finite double sum of rational fractions plus a remain…
The paper develops continued fraction based approximations for the MacRobert E-function in the case relevant to asymptotic representations of several functions associated with Bessel functions. It proves a representation of this E-function as a finite sum of elementary fractions plus a remainder ter…
This paper derives modulus estimates for the MacRobert E-function of a complex variable in the half-plane with nonnegative real part, under specified ordering and separation conditions on its parameters. Using multiple integral representations, continued fraction expansions, and inequalities for int…
This paper studies two-parameter congruences of circles in three-dimensional Euclidean space whose circle planes form a one-parameter family, with particular attention to cases having multiple focal points. Using a canonized moving frame and Pfaffian differential systems, it derives the basic invari…
This paper studies three-parameter complexes of circles in three-dimensional Euclidean space whose circle planes form an h-parameter family, with h equal to 1, 2, or 3. Using Cartan’s moving frame method and Pfaffian forms, it describes the differential equations of such complexes in a canonical fra…
The paper describes design experience with single-stage multipliers using helical gears for stationary power plant drives, proposed as a more compact and technologically simpler alternative to traditional double-helical gear arrangements. It summarizes the main construction choices for the housing, …
This paper examines why the contact strength of gear transmissions increases as circumferential speed rises. It reviews three proposed explanations: growth of the lubricant film and hydrodynamic load sharing, strengthening of material under higher loading frequency, and reduction of friction with in…
The paper examines critical flow phenomena during the discharge of boiling water through cylindrical nozzles, where a two-phase steam-water mixture may reach the local speed of sound. It applies thermodynamic relations for sound speed in a homogeneous liquid-vapor medium, including a simplified form…
This article develops a calculation method for boiling-water discharge through nozzles that accounts for slip, or relative motion, of the vapor phase in a steam-water mixture. The method separates the flow cross section into vapor and liquid portions, relates actual and reduced phase velocities to v…
This paper addresses the error in determining thermal conductivity and thermal diffusivity by the plane constant-power source method when a finite rod is used to approximate a semi-infinite body. It formulates a one-dimensional heat-conduction problem with Newtonian heat exchange from the lateral su…
This paper addresses the calculation of boiling water discharge through cylindrical nozzles, where experiments show that flow rates are lower than for cold water but higher than predicted by equilibrium adiabatic expansion formulas. It argues that the inlet section initially behaves hydraulically as…
This paper addresses the simultaneous determination of thermophysical parameters in a single specimen, emphasizing the need for independent measurement of thermal diffusivity, thermal conductivity, and volumetric heat capacity to enable internal consistency checks. Building on a semi-infinite body h…
The paper addresses experimental determination of calculated thermal diffusivity and radial position parameters used to model nonstationary heating of a rubber sheathed cable as an equivalent infinite cylinder. It develops a regular thermal regime method that avoids the difficulty of placing a therm…
This paper addresses the need for thermal diffusivity data to support analytical calculation of vulcanization regimes for rubber sheaths of cable products produced on continuous vulcanization units. Using an alpha calorimeter and the regular-regime method, the authors measured thermal diffusivity co…
This paper examines how temperature-dependent transformations in the mineral matter of Nazarovo brown coal influence the formation and properties of bonded ash deposits on convective heating surfaces. Using bench-scale combustion of coal dust, followed by chemical, spectral, petrographic, and X-ray …
This paper examines the formation of bonded ash deposits during combustion of Nazarovo brown coal dust, a problem limiting the performance of steam boilers fired with Kansk-Achinsk coals. The authors describe a bench-scale combustion installation that permits controlled variation of dust combustion …
This paper describes the adaptation of the DFS-10 quantometer, a photoelectric spectral instrument, for quantitative analysis of ash, slag, and boiler deposits from coal combustion. It outlines sample preparation, internal standard and buffer selection, analytical spectral lines, calibration standar…
This paper examines combustion problems encountered when Kansk-Achinsk basin coals are fired in large boiler units, especially bonded deposits on convective heating surfaces and slagging in furnace chambers caused by the distinctive ash properties of these fuels. Drawing on operating experience, pri…
The paper examines why fly ash from Kansk-Achinsk basin coals can form strongly bonded deposits on convective boiler heating surfaces. It analyzes staged coal-particle combustion, mineral transformations involving calcium and sulfur, and thermodynamic conditions for forming calcium sulfide and sulfa…
This paper examines the problem of efficiency losses in steam turbines operating in the wet-steam region, focusing on the inadequacy of contemporary experimental and theoretical approaches to moisture-loss determination. It argues that tests based on artificial water-air or water-steam mixtures, and…
The paper argues that the further improvement of thermal power plants is limited by the operational and economic difficulties of superhigh and supercritical steam-parameter units, especially at high initial steam temperatures. It proposes steam-turbine units with maximum regeneration and adiabatic p…
This study examines how chemical composition, hardness, and structural state affect the abrasive wear resistance of several carbon, alloy, high-speed, and high-chromium tool steels. Forged and cast specimens were prepared, heat treated to hardness values of 55 to 63 HRC, and tested under low-speed a…
This study examines how heat treatment affects hardness, bending strength, and microstructure in two cast precipitation-hardening iron, cobalt, tungsten based tool alloys, one additionally alloyed with molybdenum. Specimens were quenched from high temperature using water, oil, air cooling, slow cool…
This study examines whether high-temperature short-time tempering can replace conventional triple tempering for cutters made from several high-speed steels. Equivalent accelerated tempering regimes were selected and monitored using austenometer readings, then cutters subjected to conventional and sh…
This paper investigates the wear behavior of VK8 and VK6M carbide tools during turning of difficult-to-machine titanium alloys VT3-1 and VT6. Using lathe experiments with force and temperature measurement, microscopy, contact-length measurement, and replica recording of worn geometry, the study rela…
This paper examines cutting force relationships in turning the difficult-to-machine titanium alloys VT3-1 and VT6, with attention to the strong influence of tool wear on measured force components. Experiments used carbide tools, a three-component strain-gauge dynamometer, temperature measurement, an…
This paper examines how the thermophysical and adhesive properties of cutting-tool materials affect chip shrinkage during steel turning. Building on earlier studies and using experimental measurements for steels 08 and 45 with carbide tool alloys, it relates chip shrinkage to average contact tempera…
This paper addresses measurement of drill cutting-edge displacements and elastic deformations in the machine, fixture, tool, and workpiece system during low-frequency vibration drilling, where system compliance can reduce imposed oscillation amplitudes and alter cutting conditions. It describes an e…
This study examines contact processes between the chip and the rake face of carbide tools during cutting of low ductility LS-59-1 brass. Dynamic cutting experiments over wide ranges of speed, feed, depth, and rake angle measured chip contact width, sliding-line length, cutting forces, and derived ta…
This paper examines how supplying coolant directly through internal drill holes affects cutting forces when drilling steels. Experiments on a modified vertical drilling machine measured axial force and torque for high-speed-steel and carbide-tipped drills using dry cutting, flood cooling, and intern…
This paper examines the kinematics of elemental chip formation during metal cutting of difficult-to-machine steel 45G17Yu3Kh. Using interrupted free planing tests, photographed chip roots with a deformed square grid were arranged by formation stage, and point displacements, velocities, and accelerat…
This paper develops a method for calculating the resultant cutting force in metal cutting using characteristics of static compression rather than assuming a constant hydrostatic pressure in the chip. The authors express the normal force on the deformation zone through the friction force, contact len…
This paper develops a practical method for estimating resistance to deformation in metal cutting, where particles in the chip-formation zone undergo different temperature and strain-rate conditions. The authors combine static compression flow curves with a dynamic stress correction based on loading-…
This paper addresses the determination of shear force during metal cutting at microspeeds by relating chip deformation to stress and strain intensities in the plastic deformation zone. It develops a calculation scheme using chip shrinkage, the shear-plane angle, relative shear, and the flow curve of…
This paper examines chip formation in cutting as plastic deformation occurring throughout a finite zone rather than on a single shear plane, with emphasis on the coupled roles of strain rate and deformation temperature. Using dividing grids, graphical analysis of strain histories, hardness based str…
This paper examines assumptions about tangential and normal stress distributions on the conventional shear plane in metal cutting, a problem important for modeling chip formation and cutting dynamics. Using a hardness based method for estimating plastic deformation stresses, the authors compare calc…
This paper investigates the size of the plastically deformed chip formation zone in high speed metal cutting, addressing conflicting earlier claims that the zone becomes negligible relative to chip thickness. Using coordinate division grids applied to composite specimens, instantaneous stopping of t…
This paper examines methods for applying dividing grids to specimens for experimental study of large plastic deformations, with particular attention to the chip-formation zone in metal cutting. It discusses requirements on grid base size, strength, contrast, heat resistance, and material microstruct…
This paper examines excessive vibration and noise in single-frame electrical-machine amplifiers whose armatures remained problematic after conventional two-plane balancing. Analytical and resonance tests of bending natural frequencies showed that the operating speeds were about 0.6 to 0.7 of the fir…
