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 examines the use of geophysical methods for prospecting residual titanium deposits formed in the weathering crust of gabbroic rocks, where ilmenite enrichment is uneven and difficult to characterize by sparse drilling alone. Based on magnetic surveying and vertical electrical sounding, th…
This paper examines the geomorphological setting of nickel-bearing weathering crusts developed on ultrabasic rocks of the Kimpersai hyperbasite massif in the Southern Urals. Using geomorphological mapping, relief classification, hypsometric analysis, and comparison with known silicate-nickel occurre…
This paper examines the dropout of an intermediate bed in a three-layer seismic section, defined as the absence of its refracted wave from the first-arrival region. Using hodograph relations, it derives formulas and presents graphs for estimating the minimum thickness ratio of the second to first la…
This paper describes nearly monomineralic olivine hornfelses discovered in the Kategir River valley, Western Sayan, at the contact between serpentinites and a granitoid intrusion. Using macroscopic observations, petrographic microscopy, optical measurements, and chemical analyses of gray olivine hor…
This paper examines the petrography, chemical composition, and contact relations of the Kanzybinsky intrusive massif on the southwestern slope of the Eastern Sayan, an area significant for iron ore occurrences. On the basis of field observations, mineralogical descriptions, chemical analyses, and va…
This paper examines the morphology of the oxidation zone at the Uskandinskoye polymetallic deposit in the Salair Ridge, where previous studies had not provided detailed descriptions of individual ore outcrops. On the basis of field observations and petrographic and mineralogical study, the authors d…
This paper examines hydrothermal wall-rock alteration associated with mercury deposits along the northern margin of the Chuya Steppe in the southeastern Altai, especially the relation of listvenitization to cinnabar mineralization. Using field relations, microscopic observations, mineral paragenesis…
This paper examines whether aplite and plagiaplite dikes in a covered ore-field area of Gornaya Shoria are genetically related to a nearby pre-Devonian granodiorite massif rather than to younger syenitic intrusions farther away. Samples from mine workings and drill cores were studied petrographicall…
This paper proves two results in dimension theory concerning weakly and strongly infinite-dimensional spaces. The first shows that a continuous map from a weakly infinite-dimensional bicompactum onto a strongly infinite-dimensional bicompactum must have at least one fiber of cardinality not less tha…
This paper reports the identification of ulvospinel in titanomagnetite ores from Mt. Patyn in Gornaya Shoria, where it occurs in gabbro associated with magnetite, ilmenite, spinel, and hematite. Using high magnification reflected light microscopy, supported by chemical, spectral, thermal, specific g…
This paper examines the origin of högbomite from Gornaya Shoria, describing its morphology, optical and physical properties, chemical composition, and mineral associations in skarn occurrences along the Mrassu River. On the basis of crystallographic observations, chemical analyses, and paragenetic r…
The paper studies decision problems for finitely presented commutative semigroups, motivated by the contrast between undecidability in general groups and semigroups and the better behavior expected in the commutative case. It constructs an explicit algorithm for determining whether such a semigroup …
This paper examines the genetic relationship between contact iron ore mineralization and intrusive magmatic complexes, with particular attention to basaltoid intrusions of Western Siberia and adjacent regions. Drawing on petrological observations from several massifs and ore districts, it argues tha…
This paper reports the occurrence and preliminary characterization of aikinite from the Ipchul deposit in Khakassia, where the mineral was found in gilbertite quartz rock containing sulfide mineralization. The study describes its crystal habit, physical and chemical properties, reactions in acids, e…
This paper examines magnesian-ferruginous chlorites widely developed in a titanomagnetite deposit of the Lysanskaya group in the Eastern Sayan and evaluates their mineralogical and genetic significance. Using optical observations, chemical analyses, thermal curves, X-ray powder data, and paragenetic…
This paper summarizes the geology and metalliferous skarn mineralization of the Bolshaya Natalyevka gold deposit on the northern margin of the Kuznetsk Alatau. Using field mapping, stratigraphic observations, structural relationships, and mineralogical descriptions, it distinguishes Lower Cambrian f…
This study examines the petrography and genesis of rocks in the southeastern part of the Iedygem intrusive massif in Gorny Altai, where an Upper Paleozoic granitoid body cuts and metamorphoses Ordovician to Silurian strata. Using field relations, microscopic mineralogical observations, modal data, c…
This paper investigates the ternary semiconductor CdSnAs2 as an electronic analogue of InAs, with emphasis on whether its electrical properties reflect the expected similarity in bonding and carrier transport. The authors describe improved synthesis and purification procedures that yielded homogeneo…
This study examines the interaction of ferric oxide and germanium dioxide in relation to germanium concentration in iron ores and its coprecipitation with ferric hydroxide. Precipitates with varying ferric oxide to germanium dioxide ratios were prepared using ammonia or sodium hydroxide and investig…
This paper derives an explicit formula for the Plancherel measure on Riemannian symmetric spaces of nonpositive curvature of the form G/U, where G is a connected semisimple Lie group with finite center and U a maximal compact subgroup. Using Harish-Chandra’s relation between the Plancherel density a…
This study examines the thermal decomposition and oxidation of dicyclohexylmercury in benzene, extending earlier observations that the compound is stable without oxygen but decomposes readily in air. Experiments on heating in the absence of oxygen and on oxidation with molecular oxygen identified me…
This paper reports experimental methodological deep seismic sounding studies in southeastern Turkmenia aimed at improving the use of deep postcritical reflected waves for investigating the Earth’s crust. Using continuous correlation tracing, directional reception, grouped receivers and sources, and …
This paper analyzes nonlinear phase errors that arise in frequency converters when the mixed oscillations have integral frequency ratios. Representing the nonlinear element by a power-series characteristic, the author derives Fourier expressions for the amplitudes and phases of difference and sum sp…
A relatively simple AC bridge is described for mass inspection of complex impedances, where percentage deviations from a nominal modulus and argument, or Q factor, are more important than absolute measurement. The paper analyzes errors in direct comparison of the tested impedance with a standard, sh…
This paper analyzes how to maximize undistorted output voltage in two-stage broadband and pulse vacuum-tube amplifiers by redistributing stage loads and choosing correction or feedback parameters. Using frequency-response and transient-response calculations, it derives output-voltage ratios for harm…
This paper examines how to obtain deep negative feedback in the resonant amplifier stages of a low-power transmitter while preserving adequate stability margins and manageable tuning. It proposes introducing the feedback voltage through a cathode-coupled subtracting amplifier and analyzes frequency-…
This paper proposes an experimental method for verifying distortions in the phase pattern of an antenna caused by a capacitive horizontal load, a problem that is difficult to treat analytically for broadband phased radio systems. The method compares measurements from the complete antenna with those …
This paper examines how meteoroid geocentric velocity affects the sensitivity of radar meteor observations, focusing on weak underdense trails observed near the characteristic height of maximum ionization. Using an expression for radio echo amplitude that includes ionization probability, trail diffu…
This paper analyzes how to choose the film transport speed for photographic recording of meteor radio echoes when the observations are used to estimate the exponent characterizing the meteoroid mass distribution. It derives approximate relations connecting the error in this exponent to errors in mea…
This paper examines whether a reported “negative” enrichment effect, in which the light component of a gas mixture becomes enriched at the cold end, occurs during thermal diffusion through porous media. The authors measured separation in H2, Ar, H2, Kr, and He, Kr mixtures across porous specimens un…
This paper discusses the determination of atmospheric temperature, pressure, and density in the meteor zone from radar observations of meteors. It reviews Evans’s method and identifies a major difficulty in its reliance on an uncertain dependence of meteor ionization probability on velocity, then pr…
This paper examines why the thermal stability of X-ray-produced F-centers in alkali halide crystals appears to increase with crystal lattice energy. Drawing on prior measurements of F-center decay in NaCl, KCl, and KBr and on the distinction between stable centers in undistorted regions and unstable…
This paper examines the critical transient mode of a two-stage pulse amplifier with parallel correction circuits when the stages are not identical, addressing how allowable distortion should be distributed between stages. Using pole-zero analysis of the normalized transfer functions, it derives and …
This paper analyzes the transient behavior of a two-stage pulse amplifier using parallel voltage feedback in the second stage and simple inductive correction in the first. It introduces a relative pulse figure of merit for comparing multistage amplifiers at a specified overshoot, derives transfer fu…
This article analyzes nonlinear phase errors arising in frequency conversion units of phase-measuring instruments, with particular attention to parasitic phase modulation caused by interfering combination frequencies in the mixer output spectrum. It develops a method based on the frequency regime of…
The paper analyzes the generator resistance of an intermediate stage in a multistage transistor video amplifier using a parallel correction circuit, emphasizing its dependence on the output impedance of preceding stages. By deriving expressions for the output and generator impedances under common si…
The paper examines the use of ultrasonic oscillations in electrovacuum manufacturing, especially for cleaning lamp components and accelerating zinc plating. The authors developed a 2 kW, 20 to 30 kHz ultrasonic generator with a magnetostrictive vibrator and tested it on degreasing, removal of non-oi…
This paper analyzes phase stabilization in amplifier stages using feedback with particular attention to the feedback phase angle and loop gain. It compares negative, reactive, and complex feedback for two sources of phase instability: variations in several amplifier parameters and time variation of …
This paper examines voltage-dependent phase shifts in low-frequency transformers used with synchronous phase detectors, where transformer nonlinearity causes dynamic zero drift that cannot be removed by compensating a constant phase offset. Using an equivalent circuit with source resistance, winding…
This paper analyzes a frequency summation circuit based on reducing summation to pure multiplication of sinusoidal functions. It formulates the operating conditions for such multiplication using a controlled resistance, including linear dependence on the control factor, signal linearity, minimal cou…
This paper presents an oscillographic method for measuring small phase-modulation indices when the measured and reference signal frequencies have an arbitrary rational integer ratio. Using parametric equations of Lissajous-type interference patterns on a cathode-ray tube, it derives formulas that re…
This paper analyzes high-frequency distortion correction in a two-stage junction-transistor amplifier using an RC lead network in the emitter circuit. It derives the effective source impedance of the second stage from the output impedance of the first stage, then uses normalized frequency-response e…
This paper presents an oscillographic method for measuring the frequency instability of signal generators. The method uses an interference pattern formed by applying related-frequency voltages to the horizontal and vertical deflection plates of a cathode-ray oscilloscope, with a high-Q circuit conve…
This paper analyzes amplitude-dependent phase shifts in the input circuit of a common-emitter transistor amplifier, using a P-16 transistor as an example. The input resistance and capacitance are represented as nonlinear functions of the input voltage, and Kirchhoff equations are reduced to a nonlin…
A homogeneous polymer membrane with complex-forming properties was prepared to address the limited selectivity of conventional ion-exchange materials toward specific metal ions. The membrane was synthesized from a copolymer of diisobutyl vinylphosphonate and acrylic acid, cross-linked with triallyl …
This paper studies periodic subgroups of maximal solvable subgroups of the full linear group over an algebraically closed field of arbitrary characteristic. It proves, first for maximal irreducible solvable matrix groups and then in general, that all maximal periodic subgroups of such a maximal solv…
The paper proposes using electron paramagnetic resonance measurements of free radical stability as a structural tool for organic compounds. Compounds of uncertain structure are converted to radicals, their disappearance kinetics and half-lives in inert or model conditions are measured, and the resul…
This paper studies the local behavior of trajectories near an isolated singular point of a system of differential equations using generalized Lyapunov functions. It refines earlier definitions by partitioning a neighborhood into domains separated by topological cones and relates the signs of a Lyapu…
This paper analyzes internal symmetry in axiomatic quantum field theory under the assumption of conserved spatial parity, with attention to gradient invariance, isospin, and hypercharge. It argues that ordinary spatial reflection is incompatible with gradient-invariant theories unless accompanied by…
The paper gives a general criterion for the existence of wave operators for pairs of self-adjoint operators in a Hilbert space, motivated by limitations of earlier trace-class perturbation results. It introduces a class of admissible real analytic functions of the operators and proves that, under a …
