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 evaluates the applicability of rotary-percussive drilling machines for exploratory boreholes at the Khaidarkan mine, where variable medium to high strength rocks limited the effectiveness of existing percussive-rotary and rotary drilling equipment. Industrial tests compared a modified BU-…
This paper examines how static and impact loading affect material fracture in relation to the performance of hand-held pneumatic hammers. Using tensile diagrams for St. 3 low-carbon steel obtained under static testing and drop-weight impact loading, the authors compare total specific work of deforma…
This paper describes the design and testing of the BSZ-135V pneumatic chipping hammer, developed from the BSZ-135 to reduce vibration transmitted to the operator. The hammer separates the handle assembly from the impact assembly by a conical spring and uses a rubber vibration-damping coupling around…
This paper develops a theoretical basis for more unified laboratory testing of the vibration properties of hand-held pneumatic impact machines, focusing on how pressing devices and impact-energy absorbers affect measured vibration. Using simplified equations of motion for the hammer body, it compare…
This paper reports laboratory tests of the BSZ-135 pneumatic chipping hammer conducted under conditions approximating production use, with measurements of energy parameters, chipping rate, vibration, and noise. Using a modified test stand, pressure diagrams, vibration transducers, spectral analysis,…
This paper examines how the dynamic frequency range of seismic vibration sensor suspensions is governed by the ratio of the first overtone frequency to the fundamental frequency. It proposes the stiffness per unit spring mass, C divided by m, as a comparative parameter for evaluating and designing e…
The paper examines requirements for vibration measurement equipment used in studying and inspecting impact-action machines, especially pneumatic hammers. It reviews limitations of available serial instruments, including restricted frequency ranges, inadequate overload and displacement capacity, frag…
This paper surveys and organizes existing methods for determining the parameters and performance indicators of pneumatic hammers. Drawing on Soviet and related technical literature, it classifies calculation and investigation approaches into analytical, grapho-analytical, graphical, and experimental…
This paper establishes Schauder-type estimates for solutions of parabolic systems in the sense of Petrovskii in spaces with refined Hölder exponents. Under the minimal integral condition on the exponent, it proves interior estimates and well-posedness with estimates for the Cauchy problem, while est…
This paper studies the correctness, in the sense of Petrovskii well-posedness, of first differential approximations associated with finite difference schemes for first-order hyperbolic systems. It defines the first differential approximation by expanding the difference operator in the mesh parameter…
This paper proposes a neurophysiological model of pattern recognition and abstraction based on Pavlovian association, receptor specialization, and threshold neural elements with plastic synaptic connections. It argues that repeated simultaneous perception of varying signal sets can automatically pre…
This paper analyzes how a constant electric field in the base of a semiconductor diode, produced by an impurity concentration gradient, affects the effective lifetime of minority carriers during turn-on transients. A one-dimensional planar diode model with a bounded base and a high-resistance region…
This paper describes a centralized system developed at Tomsk Polytechnic Institute for monitoring, regulating, and signaling the temperature regimes of electric furnaces. The system uses cyclic polling of up to twenty monitored points, each serving twenty furnaces, with thermocouple sensing, setpoin…
This paper describes an automatic remote alarm signaling system developed for detecting emergency states at distributed industrial facilities. The proposed arrangement uses group polling, time-division multiplexing of communication channels, and cyclic synchronization of distributors to monitor twen…
The paper addresses fault localization in the control unit of the Minsk-1 electronic digital computer, a component responsible for a substantial share of computation-mode failures and requiring significant diagnostic time. It proposes an attachment used with test programs to monitor selected basic e…
The paper describes an electronic extremum, start, and stop unit for an automatic device that determines the mean displacement of a pneumatic hammer body from vibrogram extrema over a prescribed number of oscillations. The proposed circuit uses two Schmitt triggers, differentiating circuits, amplifi…
This paper examines an active compensation filter for reducing ripple in the load circuit of a single-phase full-wave rectifier. The proposed circuit uses a frequency doubler whose output windings supply a double-frequency compensating voltage adjusted in magnitude and phase to cancel the fundamenta…
This paper reports laboratory and production tests of a prototype airflow velocity sensor intended for mine ventilation monitoring, using a deflecting flap as the sensitive element and a transformer-based angle converter. The authors describe the prototype design, its electrical parameters, and an a…
This paper examines a simple way to convert a sinusoidal voltage generator into an equivalent current generator without using feedback summing amplifiers. It analyzes a T-shaped resonant four-terminal network and derives conditions under which the load current is independent of load resistance, show…
This paper examines the design of smoothing chokes on non-standard cores when the objective is to maximize the time constant for a specified inductance, which reduces to minimizing direct-current resistance. It derives a resistance expression in terms of electromagnetic constants, cooling conditions…
This paper develops a theoretical explanation of the Urbach rule for the long-wavelength edge of light absorption bands associated with localized excitations in crystals. Starting from the adiabatic theory of absorption with lattice vibrations, it includes changes in normal-mode frequencies upon ele…
The paper addresses laboratory testing of onboard gyroscopic devices under angular motions representative of aircraft and ship operation, where errors are strongly affected by random rocking rather than purely harmonic motion. It proposes a three-axis gimbal test bench whose platform and rings repro…
This paper examines the dynamic behavior of a cross-field electric machine amplifier operating near its stability boundary, with attention to how internal nonlinear characteristics affect transient processes. Using an electronic model of the EMU-5P amplifier with a resistive inductive load, the stud…
This paper addresses the reproduction of periodic disturbing forces in mathematical modeling of pneumatic hammer body vibrations, particularly when the working tool may be treated as immobile and the striker motion need not be modeled explicitly. It argues that standard low-frequency generators prov…
The paper describes an electronic instrument for measuring the diameter of thin wires, intended for calibrating drawing die holes by measuring wires drawn through them. It presents a differential measuring scheme using two slotted inductive transducers, alternately switched into a measuring generato…
This paper examines a slotted inductive eddy-current sensor for contactless measurement of cylindrical products, proposed as an alternative to through-coil sensors whose performance may be affected by product temperature, insertion inconvenience, and manufacturing difficulty at small dimensions. The…
This paper examines how the fixing device in an electrical instrument affects the accuracy of measuring the static friction torque of instrument ball bearings. It proposes using a device actuated by a threshold angle of rotation rather than by the small acceleration of the moving part, and derives e…
This paper analyzes an automatic device for measuring the dynamic friction torque of instrument ball bearings, treating it as a low-power closed-loop automatic-control system with an electromagnetic inverse transducer in the feedback path. Using a structural-functional diagram, the authors derive tr…
This paper examines how deviations from circularity in a nonmagnetic cylindrical product affect eddy-current measurements made with an inductive through-coil transducer. Treating the transducer as an infinitely long solenoid, it compares the losses and introduced impedances for elliptical and circul…
This paper examines multiparameter nondestructive inspection of ferromagnetic products by the eddy current method, focusing on separate measurement of material and geometric parameters and suppression of interfering influences. It formulates the inspection problem as a system of functional relations…
The paper describes a semiautomatic digital measuring setup intended for experimental investigation of pulse-width modulators, especially magnetic-semiconductor modulators requiring high accuracy in static measurements and practical recording of dynamic behavior. It proposes a method for obtaining t…
The paper addresses the absence of a sufficiently complete and widely accepted classification for accelerometers used to measure linear acceleration. It reviews the limitations of classifications based on a single feature and proposes a multi-criteria scheme organized by purpose, measured accelerati…
This paper develops practical calculations for the reliability of one-sided limit inspection when both the tested parameter and the measurement or control error are random. Building on general formulas, it derives conditional probabilities for correct detection, undetected defects, false rejection, …
This paper analyzes the reliability of one-sided boundary control for a scalar parameter when the measuring or controlling instrument has known random error. It formulates the inspection outcome as the sign of the difference between the true parameter and a random control signal, then classifies pos…
This paper discusses further automation of betatron operation, focusing on control of electron capture through adjustment of the injection phase to regulate gamma radiation intensity. It argues that existing intensity stabilization systems are not optimal because supply-voltage fluctuations and othe…
The paper examines the use of pulse Boolean variables for synthesizing multi-cycle potential-pulse relay devices. It derives the number of admissible variable combinations and logical functions when each Boolean variable has static and pulse components, then adapts matrix methods such as Karnaugh an…
The paper addresses difficulties in applying Boolean algebra to relay devices that combine static potential signals with pulse signals, since identical Boolean notation obscures their distinct temporal behavior. It proposes a special pulse-duration operator applied to Boolean variables or expression…
The paper analyzes how to divide complex non-redundant radio-electronic equipment into monitored units when operability is checked sequentially rather than simultaneously. It formulates the mean restoration time as the sum of fault localization within a unit, sequential unit checking, and fault elim…
The paper proposes an economic criterion for evaluating fault detection and localization systems in long term use devices with continuous operation. Starting from a mean loss model that includes failure intensity, repair time, downtime losses, repair costs, and maintenance costs, it separates total …
The paper studies the connected components of the space of real elliptic differential operators in two variables with constant matrix coefficients, formulated through the associated real elliptic matrix pencils. It addresses a problem posed by Gel'fand, Petrovskii, and Shilov, extending earlier resu…
This paper examines the internal heat-transfer problem governing the heating of steel billets and ingots, focusing on quantities needed for practical furnace regimes: heating time, maximum cross-sectional temperature difference, and the time at which this maximum occurs. Because the problem involves…
This paper examines oxygen diffusion and consumption inside a burning spherical fuel particle, emphasizing the effect of a time-varying internal reaction coefficient during burnout. It formulates a nonstationary diffusion problem with a moving particle boundary, introduces an approximate reacting-la…
This paper addresses the estimation of volumetric heat generation in betatron magnetizing windings, where heating arises from both ohmic losses and eddy currents induced by strong stray magnetic fields. It develops engineering methods based on transient temperature measurements under thermal insulat…
This paper presents an engineering method for calculating the thermal state of air-cooled magnetizing windings in betatrons when heat generation along a vertical row of winding bars varies approximately linearly with height. Using heat-transfer relations for air supplied either from below or from ab…
This study examines the kinetics of low-temperature oxidation in brown coal, emphasizing the influence of preexisting oxygen-containing groups that are abundant in such coals before experimental treatment. Nazarovo deposit coal was oxidized isothermally at 105°C in purified air, with parallel nitrog…
This paper reports balance tests of a two-pass KTsS-25-7 condenser used with a VT-25-3 turbine, focusing on how steam load and circulating-water flow affect vacuum, water heating, temperature head, steam-side resistance, and heat transfer. Measurements were taken over a range of loads with one and t…
Experimental tests were conducted on modifications to the axial guide vane assembly of the VDN-8 centrifugal fan to improve capacity regulation at constant rotational speed. The study compared conventional radially outlined flat blades with redesigned blade and hub configurations intended to produce…
This paper reports an industrial trial of a REP-1M pulse controller for automatic regulation of the working-space temperature in a glass-melting furnace. Because the standard controller dead zone was too large for the required temperature accuracy, the authors introduced a preliminary amplifier betw…
This paper examines the operation of a rotary regulating damper in an automatic temperature control system for a glass melting furnace fired with unpurified mixed producer gas. Based on plant trials at the Tomsk Electric Lamp Plant, it describes deposit formation on gas pipelines and damper surfaces…
This paper examines unsteady heating of steel plates and cylinders under combined radiative and convective heat transfer, with temperature dependent thermal conductivity and heat capacity and, for carbon steels, the heat effect of structural transformations. The authors formulate the resulting nonli…
