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 reports the first synthesis of high molecular weight polypyrazoles containing alternating pyrazole rings in the polymer chain. The authors obtain these cyclolinear polymers by reacting bis(beta-diketones) with dicarboxylic acid dihydrazides through a two stage polycyclization, first formi…
This study examines cyclohexane adsorption on a chromia, alumina, potassium catalyst relevant to paraffin dehydrogenation and dehydrocyclization, using a combined vacuum microburet and volumetric method over a broad temperature range. Adsorption up to 150°C was rapid, reversible, and physical, with …
The paper introduces almost geodesic curves in torsion-free affinely connected spaces as curves admitting a parallel two-plane field containing the tangent direction, and derives their differential equation. It studies mappings between affine and Riemannian spaces that send geodesics or almost geode…
This paper theoretically examines the transition between thermal self-ignition and ignition in a reacting cylindrical system whose initial temperature is below that of the surroundings. A nonstationary heat-conduction and reaction equation for a zero-order reaction with fixed surface temperature is …
This study examines the low-velocity detonation regime in nitroglycerin, about 2.0 km/sec, for which the propagation mechanism and energy release were not well characterized. Using high-speed photographic recording of front luminescence in cylindrical charges with different casing materials and thic…
This paper extends the analysis of three-dimensional homogeneous expansion and compression of rarefied monatomic gases and gas mixtures to particles interacting through power-law repulsive or attractive central forces. Using the Boltzmann equation, the similarity properties of collision transformati…
This note studies exact similar tests for comparing the means of two normal samples when the variances are unequal, allowing randomized tests whose rejection probability is a measurable function of the observations. It observes that any similar test can be projected onto the sufficient statistics, y…
This note develops a generalized formulation of Ehresmann jet theory that does not require the underlying sets to be topological spaces. It introduces localizable families of subsets through order-theoretic notions of connectedness and partial left filtering, proves equivalent characterizations usin…
This study examines the products and reaction course of the thermal decomposition of anhydrous perchloric acid, a process for which prior information was limited. Perchloric acid was decomposed at 60, 70, and 80 °C, and interrupted reactions were analyzed chemically and spectrophotometrically for ch…
This paper examines how melting affects the shock adiabat of metals compressed by strong shock waves, especially where the adiabat intersects the melting curve and solid and liquid phases coexist. Using conservation relations, the Clapeyron-Clausius equation, and a solid-phase equation of state, the…
This paper studies the bifurcation and stability of small periodic solutions of parameter-dependent ordinary differential equations with a periodic right-hand side and a persistent zero equilibrium. Using the Poincaré-Andronov map, multiplier theory, topological index arguments, and concavity or con…
This study examines the friction angles of crushed argillite and sandstone backfill materials from the Novo-Usyatsky quarry used in mines of the Prokopyevsk deposit in Kuzbass. Using an experimental tilting-bottom apparatus, the author measured friction angles for different particle-size classes and…
This paper reports industrial tests of the RPU-3 prototype expander, a lightened reaming device designed to drive 1000 to 1200 mm raise workings in coal using light rotary drilling machines. Tests in Kuzbass mines reamed seven boreholes with a total length of 256 m under varying coal hardness and py…
This paper describes the development of frozen-ground cutting machines based on the ETU-353 multi-bucket trench excavator, motivated by the need to use idle excavators in winter without installing costly special travel-speed reducers. It presents two Tomsk Polytechnic Institute designs, “Moroz” and …
This paper identifies research tasks needed to improve bar-type machines used for preliminary loosening and cutting of frozen soils in winter construction and related operations. It argues that existing machines are difficult to compare because they are built and tested under varied conditions, and …
This paper reviews Soviet machines for cutting frozen ground with chain bar working bodies as a means of preparing soil for subsequent excavation by conventional earthmoving equipment. It surveys experimental and production use from early adaptations of coal cutting machines to self propelled instal…
The paper addresses the failure of high-power germanium and silicon diode rectifier substations used for mine traction and battery charging, where inadequate protection and cooling supervision had limited practical adoption despite efficiency advantages over mercury and selenium rectifiers. It descr…
This paper examines a gear-type rotary attachment intended to provide self-rotation of the tool in manually operated impact machines, addressing the limitations of existing hammer designs and of the Sintron-type device under axial pressure. The authors describe the operating principle of inclined el…
This paper analyzes impact energy transfer between two masses connected by an elastic link, a model relevant to the calculation and design of impact-action machines. Using the equations of motion for a two-mass spring system, it derives the natural modes, displacement and velocity relations during c…
This paper examines how longitudinal grooves in the striker of a free-travel solenoid hammer affect eddy-current losses, a major contributor to reduced efficiency and heating. Using an ammeter-wattmeter method with the striker held in magnetic equilibrium, the authors measure steel and copper losses…
This note studies uniqueness of classical solutions for a boundary value problem associated with a broad class of higher order differential equations, including elliptic and hypoelliptic types, in bounded convex domains. Building on earlier definitions of regular domains, stable boundary values, and…
This paper presents an experimental method for determining optimal design and operating parameters of a solenoid hammer with free striker runout under the constraint of permissible coil heating. The authors propose measuring striker velocity immediately before impact with a contact sensor and oscill…
This paper experimentally investigates the working process and energy performance of solenoid hammers with free run-out of the striker, using the MS-14 hammer as the initial object of study and the improved MS-15 design for comparison. Simultaneous oscillographic recording of striker displacement, c…
This paper develops a theoretical treatment of potentiostatic currents for irreversible processes at a stationary spherical electrode, motivated by the use of hanging mercury drops in electrode kinetics. It solves the spherical diffusion problem for a simple irreversible redox process and for an ele…
This paper develops a theoretical description of a solenoid hammer with free runout of the striker, focusing on the timing conditions needed to avoid electromagnetic braking and improve efficiency. Under simplifying assumptions about the magnetic circuit, air gap permeance, and losses, the authors d…
This paper examines the design parameters governing a solenoid hammer in which the striker continues by free coasting after current in the coil ceases near the magnetic equilibrium position. Using an experimental single-coil hammer, oscillograms of striker travel, current, and voltage, and simplifie…
This paper examines the disorganized production and use of hand pneumatic chipping, riveting, peening, and related hammers in Soviet industry, where many designs and standard sizes were in circulation without systematic parameter evaluation. Based on a survey of 5,410 hammers at 26 enterprises, supp…
This paper investigates the internal working processes and operating parameters of pneumatic chipping and riveting hammers produced by the TEZ plant. Laboratory tests recorded air pressures in hammer chambers, striker motion, body vibrations, and striker velocity under varying air pressures and pres…
This paper presents a calculation procedure for the vibration-isolating elastic link in pneumatic hammers equipped with elastic handles, addressing the reduction of harmful recoil and vibration transmitted to workers. Based on a two-mass model of the hammer body, spring, and handle under disturbing,…
This paper reports laboratory and industrial studies of the PMM-2 electric lifting mechanism for removable drilling-machine manipulators, developed to replace labor-intensive manual raising and lowering of the boom. Tests on an MBM-2 manipulator measured motor power, lifting speed, efficiency, and m…
This paper reports laboratory tests of a production EBK-2m core electric drill, focusing on manufacturing quality, motor and reducer losses, feed mechanism performance, friction clutch behavior, and reserves for improving drilling productivity. The authors measured motor characteristics, load behavi…
This paper reports laboratory investigations of an experimental batch of EDP-20 lightweight long-stroke electric drills developed with a 2 kW motor and based on the EDP-14 feeder arrangement. Tests on a universal stand evaluated the serviceability of the speed-switching, feed, bracing, swivel, and r…
This paper evaluates blast-hole drilling equipment and drilling methods used in Kuzbass development workings, where most rocks are of medium hardness. Using time-and-motion observations, the authors compare hand drills, pneumatic drilling hammers, column-mounted electric drills on loading-machine ma…
This paper examines the design of long-stroke pneumatic rotary drilling machines intended to increase blast-hole drilling productivity in medium-hard rocks while reducing auxiliary operations associated with column drills and drilling hammers. Drawing on theoretical drilling parameters, laboratory b…
This paper introduces preclosed mappings, a class of topological mappings containing both open and closed mappings, and compares them with Whyburn’s quasicompact mappings. It proves that under a countability-type condition the two notions coincide, gives an example showing that they differ in genera…
The decomposition kinetics of wüstite with lattice parameter 4.032 Å were investigated by magnetic analysis during isothermal annealing in vacuum between 200 and 500 °C. Changes in saturation magnetization showed two consecutive reactions below about 400 °C, pre-eutectoid magnetite precipitation fol…
This paper extends Prandtl’s solution for compression of a plastic strip between rigid rough plates to a small deformation, anisotropically hardening rigid plastic material. The authors introduce a linearized yield condition based on a tangent approximation to the moving yield circle and derive the …
This study examines the feasibility of deep adsorptive dehydration of concentrated acetic and propionic acids using ultraporous silica glasses with molecular-sieve properties. Static and dynamic room-temperature experiments were performed on several porous glass samples and compared with fine-pored …
This paper examines the acid-base indicator properties of 2-hydroxyperinaphthindenone in aqueous methanolic media over pH 1 to 14 using visible and near-ultraviolet spectrophotometry. The authors relate the reversible yellow to burgundy color change to conversion between an acidic form with an absor…
This note addresses A. Wald’s proposed approach to the Behrens-Fisher problem for two normal samples of equal size, in which invariant and monotonicity conditions lead to a critical region determined by a boundary function of the ratio of sample variances. Wald had constructed an approximate similar…
This paper examines the mechanism of mass transfer in stirred heterogeneous liquid, liquid systems, emphasizing the role of interfacial adsorption phenomena not accounted for by film or penetration theories. Using malachite green and crystal violet transfer from dichloroethane into aqueous sodium su…
This study examines the composition and hydroxyl group positions of alcohols formed during liquid phase oxidation of n-amyl, n-heptyl, and n-nonylcyclohexanes in the presence of boric acid. The authors oxidized the resulting alcohol mixtures with chromic acid, identified the carboxylic acids via met…
This paper examines the magnetic properties of baked rocks formed by the burning of coal seams in the Kuznetsk Basin and their significance for magnetic surveying of burn-out zones. Using oriented samples from several deposits, the study measures magnetic susceptibility, remanent magnetization, and …
This paper examines the use of magnetic surveying to map dike rocks, known locally as Tomsk diabases, in the Ushaika River valley between Tomsk and Bolshoe Protopopovo. Based on surveys conducted with an M-2 magnetometer over about 40 square kilometers, the authors compare magnetic anomalies with kn…
This paper presents an engineering-geological mapping and zoning study of Tomsk intended to support urban planning and reduce delays in site investigations. Using accumulated geological, hydrogeological, and engineering-geological data from construction surveys, together with observations of geomorp…
This paper examines the vertical hydrogeochemical zonality and formation of groundwater in the Belovsky district of Kuzbass, relating water chemistry, gas composition, mineralization, and depth to major geostructural and geomorphological settings. Using data from springs, wells, boreholes, and mine …
This paper reexamines the placement of the lower boundary of the Middle Cambrian in the Sayan-Altai folded region, focusing on correlations among Cambrian formations and their archaeocyath and trilobite assemblages. Comparing faunal evidence from the Kameshkovskii, Kayanchin, and Bol’shcherbin units…
This paper proposes a standardized procedure for mass crystallomorphological analysis of accessory zircon in igneous and sedimentary rocks, where crystal size makes conventional methods for large crystals unsuitable. The method combines selection of representative crystals under a microscope, goniom…
This paper argues that density should be treated as a significant characteristic of igneous rocks alongside chemical and mineralogical composition. Using average density and chemical composition data for intrusive rocks from granites through peridotites, and comparing these patterns with published e…
This paper reports the first discovery of trilobites of the genus Bulaiaspis in Lower Cambrian carbonate deposits of the Batenev Ridge, near Sukhaya Erba, and places the finds within a revised local stratigraphic framework. Using field collections of trilobites, archaeocyaths, gastropods, and hyolit…
