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 describes an oscillographic device for reconstructing and displaying continuous distributions from discrete sensor samples using the method of continuous-sequential readout. The authors present an implementation of a selected reconstruction algorithm based on a low-pass Butterworth filter…
This paper analyzes resonance phenomena in an alternating current bridge consisting of two tightly inductively coupled coils and two impedances, assuming negligible coil losses and unity coupling coefficient. Starting from expressions for the voltages across the bridge arms, the authors examine five…
This article reviews analog-to-digital conversion methods for control and information-processing systems in which analog signals must be represented in digital code. It compares sequential counting, successive-approximation coding, and reading methods using accuracy, conversion speed, hardware volum…
This paper considers the evaluation of volume integrals of the form \(I(t)=\int_V X(r,t)\varphi^2(r,t)\,dv\), where both factors vary in space and time and direct treatment is complicated by nonseparable time dependence. The authors differentiate the integral with respect to time, express one result…
This paper presents a computational procedure for determining effective microscopic neutron absorption cross sections for materials irradiated in a reactor spectrum. It formulates the calculation using a neutron energy distribution composed of Maxwellian thermal and epithermal components, derives ex…
This paper presents a separation of variables approach for computing triple volume integrals of a form involving a time dependent function and the square of another spatial-temporal function. The method expands both functions in the same eigenfunction system, reducing the governing first order diffe…
This paper derives an upper error bound for arbitrary quadrature formulas applied to one-periodic functions in the Sobolev class with square-integrable derivative of order m. Using Sobolev’s extremal function approach, the error functional is represented through a periodic solution of a differential…
The paper studies lower estimates for the error of numerical integration formulas on a one dimensional class of functions whose sine Fourier coefficients decrease exponentially. Using a dimension counting argument, it constructs a nonzero trigonometric polynomial that vanishes at any prescribed set …
This paper examines the choice of time quantization interval for discrete differentiators used to measure the rate of slowly varying signals. It analyzes the error of estimating a derivative by a first-order finite difference when the measured signal has a static measurement error, deriving an appro…
The paper addresses how to determine the maximum time interval over which a linearly extrapolated function value remains within a prescribed admissible error. Using standard interpolation error estimates, the authors derive the extrapolation error from Newton’s interpolation formula for unequal inte…
This paper estimates the maximum error arising when a digital integrator with cyclic-code counters integrates a step function, a case relevant to digital linear integrators and specialized computing devices. The authors formulate the exact and device-produced output quantities at integer pulse count…
This paper addresses estimation of the skin effect caused by drilling mud contamination around oil exploration wells, emphasizing cases where mud penetrates beyond a thin wall cake and reduces near-well permeability. It proposes a procedure using steady-state well inflow test data rather than the mo…
This paper examines the geological structure and relative ages of intrusive rocks in the Sarala gold-bearing district, where magmatism is localized along a long-lived branch of the Kuznetsk-Alatau deep fault. On the basis of geological mapping, petrographic observations, and cross-cutting and contac…
This paper reassesses the local stratigraphic subdivision and correlation of the Lower Balakhon subseries in the Anzher district of Kuzbass, where earlier correlations with the Kemerovo stratotype were based on limited or imprecisely located paleontological material. Using fossil plant collections f…
This paper examines the host rocks of the Eldorado gold deposit in the Yenisei Ridge, focusing on their structural, textural, mineralogical, and metamorphic characteristics. On the basis of field relations, petrographic observations, optical properties, and chemical analyses of key minerals, the aut…
This paper examines buried soil horizons within Pleistocene loess-like deposits in the southwestern Kuznetsk Basin, focusing on the Kolmogorovo section as a detailed example. Using field morphology, profile descriptions, and physicochemical analyses of continuously sampled sediments, the authors ide…
This paper examines patterns in the physical and mechanical properties of overburden rocks at the Berezovsky lignite deposit in the Kansk-Achinsk basin, with attention to their relevance for engineering-geological assessment of open-pit mining sites. Using correlation analysis of field and laborator…
This paper characterizes hydrothermal metamorphic products and associated ore mineralization in terrigenous carbonate rocks of Lower Ordovician and Devonian age. It distinguishes areal metasomatites, controlled by a deep fault and enriched in uranium relative to unaltered rocks, from near-ore metaso…
This paper examines how geological interpretation should guide the estimation of commercial oil and gas reserves and the placement of exploratory wells in fields of the Tomsk Region. Using data from explored fields in the Sredne-Vasyugan and Pudino districts, it evaluates the influence of pool size …
This paper examines the distribution of geochemical indicator elements in low-sulfide gold-quartz veins of the Kindikan-Irokinda ore cluster in Northern Buryatia. Using metallometric sampling of ore bodies and surrounding altered and unaltered rocks, followed by approximate quantitative spectral ana…
This paper presents rational technological schemes for driving horizontal mine workings by hydraulic methods, aimed at improving productivity, reducing labor intensity, and lowering construction costs in hydraulic coal mines. Drawing on domestic practice and serially produced equipment, it compares …
This paper addresses the need for unified exploration methods for Kuzbass coal deposits after newer reserve-classification instructions ceased to group deposits by natural factors relevant to exploration. On the basis of structural and tectonic analysis of mine fields across the basin, the authors a…
This paper presents a spectral method for quantifying vanadium in crude oil samples from several fields in Tomsk Oblast, addressing the laborious nature of the standard ashing and photometric procedure. The authors describe sample ashing, dissolution in sulfuric acid, addition of cobalt and sodium c…
The paper describes the composition, structure, and age of the gabbro-syenite intrusive complex in the northwestern Saksyr Ridge of the Kuznetsk Alatau. On the basis of geological mapping, petrographic descriptions, mineralogical observations, chemical comparisons, and potassium-argon age determinat…
This paper examines the petrographic composition, petrogenetic coal types, and seam structure of Seam III at the Chernovskoye brown coal deposit in Central Transbaikalia. Using polished thin sections and blocks from 210 samples, with microcomponent counts recalculated for seam composition, the study…
This note examines post-sedimentary alteration in carbonate rocks of the Chingasan Series in the northeastern Yenisei Ridge, focusing on deposits of the Lopatino and Pod’emnaya formations. On the basis of macroscopic and microscopic observations, it distinguishes two principal alteration processes, …
This study examines the groundwater chemistry and gold migration forms at the Konstantinovskoye and Medvezhye gold ore deposits in the Olkhovsko-Chibizhek district of the Eastern Sayan Mountains. Based on chemical, trace-element, polarographic, microbiological, and filtration or dialysis analyses of…
This paper evaluates the gold potential of skarn occurrences in the northern Sarala ore field of the Kuznetsk Alatau, where known gold mineralization is mainly represented by gold-bearing quartz veins. Using geological observations, channel sampling of bedrock and dumps, and placer concentrate sampl…
This paper examines how methodological error estimates can be used at the design stage of analog optical correlators for computing correlation functions of random signals recorded on optical transparencies. Starting from a general optical correlation scheme, it adapts variance expressions for finite…
The paper discusses the organization of an information data bank for automated control systems in power production, where real-time operation, reliability, and gradual transition from non-automated procedures impose specific requirements on data structure. It argues that the information base should …
This paper examines an analog closed-orbit analyzer intended for high-energy accelerators, where magnetic-field perturbations distort the beam orbit and make inverse determination of perturbations an ill-posed problem. The authors formulate the smoothed closed-orbit equation, describe an analyzer us…
This paper presents an algorithm for automatic correlation of seismic waves and construction of a compressed seismic section from reflected-wave seismic records. The method divides seismograms into quasi-stationary time segments, estimates pairwise cross-correlation functions for adjacent traces, de…
The paper addresses the spectral problem for an arbitrary real or complex square matrix and reviews its reduction to eigenvalues, eigenvectors, associated vectors, and Jordan blocks. It argues that determinant-based and Danilevsky approaches become impractical for larger matrices, then proposes a ge…
The paper analyzes convergence and statistical properties of an iterative integral identification method for estimating the coefficients of a linear form from observations affected by additive zero mean noise. The authors reformulate the recurrence in matrix form, derive conditions under which the i…
This paper examines the use of phase-frequency characteristics in processing seismic records, particularly for detecting reflected waves when amplitude-based frequency filtering is insufficient. The authors compute amplitude and phase spectra for finite seismogram segments using Fourier-based formul…
The paper treats the generalized eigenvalue problem for two arbitrary real or complex square matrices, seeking nonzero vectors satisfying a matrix pencil equation. It derives the characteristic equation from the determinant of the pencil, discusses repeated roots and the resulting shortage of indepe…
The paper presents a finite-difference approach for solving a two-point boundary value problem for a second-order linear ordinary differential equation with continuous coefficients. It derives sixth-order formulas for the first and second derivatives at mesh points using Newton, Stirling, and backwa…
This paper develops general formulas for approximating a function and its derivatives by the method of partial matching on an interval with arbitrarily placed nodes. It presents the usual finite expansion in independent basis functions, derives the Lagrange polynomial form for arbitrary nodes, and d…
This paper develops a least-squares approach to a boundary spectral problem for the two-dimensional Helmholtz equation in a closed, possibly multiply connected domain with a mixed boundary condition whose coefficients depend on both spatial variables. The eigenfunction is approximated by a finite ex…
This paper presents a collocation least-squares approach for approximating the solution of a two-dimensional Poisson boundary-value problem on a closed, possibly multiply connected plane domain. The unknown function is expanded in prescribed linearly independent basis functions, and overdetermined r…
This paper addresses calculation of the electric field in a diode for high-current electron beam formation, where a multi-tip cathode faces a plane anode. The authors approximate the hexagonal elementary cell of a regularly packed tip array by a circumscribed cylindrical cell with zero normal field …
This paper examines the transport and focusing of a high-current relativistic electron beam by magnetic helical quadrupole lenses, with attention to pulsed lens operation and low-inductance configurations. Beam-envelope equations including space-charge effects were solved by analog modeling and by R…
This paper addresses the numerical calculation of electron beam characteristics in high-current direct-action accelerators, where space charge and the beam’s self-magnetic field significantly affect acceleration between cathode and anode. It formulates the coupled problem as Poisson’s equation for t…
A two-channel analog-to-digital converter was developed, built, and tested for digital recording of continuous electrical signals on magnetic tape and subsequent computer input. The design uses Ural-10 modules and bit-by-bit balancing, with an eight-bit register, feedback digital-to-analog converter…
This paper revisits the proof of correctness for the non-restoring division method used in digital arithmetic units, especially in implementations where relative shifting is achieved by shifting the divisor register. It contrasts division with explicit remainder restoration and division without expl…
This paper develops a calculation method for a thyristor AC autotransformer voltage stabilizer, focusing on the influence of magnetic saturation on the voltage drop across the regulating element. Under simplifying assumptions that neglect core losses, winding losses, and leakage flux, the authors fo…
The paper addresses automated analysis and quality assessment of hardware control circuits for digital devices using the LYAPAS language. It develops simulation procedures and L-operators for combinational and sequential devices, including a binary decoder, counter, and pulse distributor, while mode…
This paper examines a one-level kinetic scheme for photoprocesses in solid inorganic azides, including photodecomposition and related electronic processes under illumination. The authors formulate a system of differential equations for excited azide ions, neutral centers, electrons, and nitrogen for…
This paper proposes a random search approach for small nonlinear programming problems with relatively few constraints, combining statistical search with a penalty function scheme. The method modifies the penalty procedure by adding a constraint tied to improvement of the objective function, adapting…
This paper proposes an integral projection method for identifying mathematical models of static objects from experimental observations. It derives simple formulas for estimating the coefficients of a linear model using Monte Carlo approximations of coordinatewise integral projections, then introduce…
