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 how the chemical composition of groundwater forms in tectonic disturbance zones of the Tom-Yaya interfluve, where fractured Paleozoic rocks, dike-filled faults, sulfide mineralization, and unconsolidated cover deposits interact. Drawing on hydrogeochemical surveys, spring and wel…
This paper examines crystalline-zonal and collomorphic structures in primary ores of the Gai copper-pyrite deposit in the Southern Urals as indicators of ore-forming conditions. On the basis of microscopic study of polished sections, including electrolytic structural etching, it describes the distri…
This paper examines prospecting and evaluation methods for stockwork-type gold deposits in the Kommunar district of Khakassia, where mineralization is associated with granodiorite contacts, dioritoid bodies, major faults, and hydrothermally altered rocks. Drawing on geological observations and earli…
This paper examines autometasomatic alteration associated with small diorite intrusions cutting granites of the Kyrinsky intrusive complex at the Ilinskoye gold deposit in Eastern Transbaikalia. Using petrographic observations and mineralogical and chemical comparisons across contact zones, it descr…
This article examines loose products in the oxidation zones of sulfide deposits as potential criteria for evaluating ore outcrops, drawing on studies of deposits in Western Siberia. It characterizes barite, quartz, jarosite, and limonite sands, as well as disintegration products of altered country r…
This paper examines the petrography and intrusive history of the Buiba granite massif in the Western Sayan, a large representative of the Dzhoi granite type. On the basis of field relations, contact features, dike intersections, and microscopic mineralogical descriptions, the massif is interpreted a…
This paper describes the limited occurrences of trachydolerite intrusions in the western Siberian Platform and interprets them as an early, independent phase of trap magmatism. On the basis of field observations, petrographic descriptions, and chemical and spectral analyses, the study characterizes …
This paper examines scapolite development in the exocontact zones of trap intrusions along the western margin of the Siberian Platform, where earlier literature had treated the mineral as minor. On the basis of field observations, petrographic description, optical measurements, X-ray and thermal stu…
This paper describes orthite identified in garnet-pyroxene skarns of the Yenisei Ridge, developed at the contact between granites and Proterozoic limestones. Using mineralogical, optical, X-ray, and chemical analyses, the authors characterize its occurrence with clinozoisite, epidote, diopside, and …
This paper describes two morphological varieties of pyrite found as disseminations in hydrothermally altered Lower Cambrian sandstones and gravelites of the Yenisei Ridge. Using crystal morphology, reflected light observations, etching behavior, microchemical tests, and chemical analyses, the study …
This paper examines the Verkhne-Kondomsky granodiorite massif in Mountain Shoria, an intrusive complex associated with long-worked gold placers and nearby copper, iron, and cinnabar occurrences of uncertain origin. On the basis of field relations, petrographic description, microscopy, and magnetomet…
This paper examines the morphology and size distribution of native gold grains from primary and placer deposits in the Kommunarovsky gold-bearing district of Khakassia. Gold was liberated from ore samples by acid etching of quartz and calcite, then studied microscopically and statistically across st…
This paper examines how fracture systems influenced the emplacement of dikes, metasomatic rocks, and gold mineralization in the Solgon sector adjoining the Kommunar gold ore field in Khakassia. Based on geological mapping and statistical analysis of more than 3,550 fracture measurements, it distingu…
This paper describes carbonatites associated not with the commonly recognized alkaline ultrabasic complexes, but with a gabbroid magmatic complex in Gornaya Shoriya near the Minusinsk trough. Using field relations, petrographic observations, and mineral associations from a zoned gabbro massif and it…
This paper examines serpentines from a gabbro, pyroxenite, and serpentinite complex in the southwestern spurs of the Eastern Sayan, where they are associated with titanomagnetite-bearing rocks but differ from serpentines of typical hyperbasite massifs. Using petrographic observations, optical measur…
This paper examines structural controls on supergene nickel deposits formed in the weathering crust of ultrabasic rocks in the Ural fold belt. Drawing on regional and local observations from multiple hyperbasite massifs, it argues that latitudinal tectonic structures, concealed faults, flexures, zon…
This study evaluates the plasticizing behavior of two carbazole derivatives, 9-octylcarbazole and 3-acetyl-9-octylcarbazole, in polyvinyl chloride, comparing them with dibutyl sebacate under similar conditions. PVC plasticates containing varied plasticizer concentrations were examined by thermomecha…
This paper discusses the design and operation of filtration units at mineral processing plants, focusing on continuous vacuum filters used between thickening and drying. It reviews conventional layouts that rely on hydraulic seals to protect vacuum pumps from filtrate entrainment, then proposes an a…
This study examines the mechanism of aromatic nitration by 100 percent nitric acid in nitrobenzene solution at 20°C for benzene, chlorobenzene, and bromobenzene systems. The authors propose a stepwise mechanism involving nitric acid complexation with nitrobenzene, formation of the nitronium cation, …
This study examines methods for reducing the mineral ash content of sulfite-alcohol stillage concentrates, whose calcium lignosulfonate salts can limit use in applications requiring low impurity levels. Experiments on foundry-grade concentrate compared ammonium carbonate, ammonium sulfate, and sulfu…
This study examines how chromium oxide is distributed during processing of ilmenite concentrates intended for pigment-grade titanium dioxide, since chromium impurities can discolor the product. Three ilmenites with different chromium contents were decomposed by a solid-phase sulfuric acid method, an…
This paper examines the use of electrostatic precipitation for fine purification of water gas from tar and dust in electric-lamp production, where contaminated gas caused burner coking, machine downtime, and product rejects. The authors measured gas composition, tar properties, and operating paramet…
A rapid quantitative method is proposed for determining nitrogen in oxygen-free organic compounds by fusing a weighed sample with metallic sodium in a closed stainless steel bomb. The reaction products, containing sodium cyanide, are transferred to solution and titrated with silver nitrate, with pot…
A thermistor-based method is described for determining molecular weights of organic compounds, addressing the limited accuracy of conventional cryoscopic and ebullioscopic measurements caused by temperature measurement errors. The method measures temperature differences produced during evaporation o…
This paper describes the development of a high-frequency instrument for determining solution concentration in process and laboratory control. The authors investigate the use of a Q-meter type circuit with an inductive sensor, measuring changes in circuit quality factor and energy consumption when so…
This study examines whether a GÉUK-21 automatic electric gas analyzer, originally intended for continuous carbon dioxide measurement in combustion products, can be recalibrated to determine hydrogen in producer gas. Using relative thermal conductivity data, the paper derives corrections for the infl…
This paper examines whether a collective titanium, zirconium concentrate can be processed directly by chlorination, avoiding more complex selective beneficiation of titanium and zirconium minerals. Briquettes of the concentrate with peat as reducing agent and binder were chlorinated in a laboratory …
The study examines the reduction of 3,6-diacetyl-9-methylcarbazole and 3,6-diacetyl-9-ethylcarbazole with aluminum isopropoxide under Meerwein-Ponndorf conditions, originally intended to produce the corresponding diols for dehydration to divinyl derivatives. Contrary to earlier reports, reduction in…
This study addresses the synthesis of 3-acetyl-9-alkylcarbazoles as intermediates for possible preparation of 3-vinyl-9-alkylcarbazoles and related polymers. Using 3-acetyl-9-ethylcarbazole as a model, the authors systematically varied acetylation conditions, including temperature, reagent ratios, s…
This study examines the synthesis of 9-alkylcarbazoles by direct alkylation of carbazole with alkyl bromides or iodides in ketone or related solvents in the presence of powdered sodium or potassium hydroxide. The authors modify earlier Stevens and Tucker conditions by replacing aqueous alkali with p…
This study examines the vinylation of diphenylamine with vinyl acetate as a route to poly-N-vinyldiphenylamine, avoiding isolation of the unstable N-vinyldiphenylamine monomer. In acetone solution with mercury(II) sulfate catalyst, the reaction proceeds in one stage, apparently through in situ forma…
A series of aryl monoesters of diphenic acid was synthesized as part of a search for new biologically active compounds. The esters were prepared by reacting diphenic anhydride with substituted phenols in dry xylene, then isolated through alkaline dissolution, acid precipitation, and recrystallizatio…
This study reports the synthesis of nine previously undescribed substituted monoamides of 4-nitro-2,2'-diphenic acid as part of a search for biologically active derivatives related to earlier 2,2'-diphenic acid amides. The compounds were prepared by reacting 4-nitro-2,2'-diphenic anhydride with vari…
This study examines the use of technical sulfuric acid hydrolysis lignin in lignophenol-formaldehyde resins intended as substitutes for pulverbakelite binders in shell molding sands. Resins were synthesized in two stages at phenol-to-lignin weight ratios of 2:1 and 3:1, varying the amount of formali…
This study examines how the polar plasticizers dioctyl phthalate and dibutyl sebacate affect the structure, thermal behavior, dielectric losses, and electrical resistivity of polyvinyl chloride resin used in cable applications. PVC samples containing 5 to 50 percent plasticizer were prepared and ana…
This study examines relationships between chemical structure and selected electrophysical properties in a homologous series of novolac-type phenol-formaldehyde resins, including phenol-, ortho-cresol-, meta-cresol-, and para-cresol-formaldehyde resins. Using X-ray structural analysis, dielectric mea…
This study examines the formation of intracomplex organosilicon compounds from alkylchlorosilanes and 8-hydroxyquinoline derivatives, focusing on the reaction of dimethyldichlorosilane with 5-hydroxymethyl-8-hydroxyquinoline. The authors prepare the methylol quinoline derivative, carry out complex f…
Methylenebis-salicylic acid is examined as a monomer capable of polycondensation with difunctional reagents to give pincer-like polyamide structures that can form intracomplex compounds with heavy metal salts. The authors prepare methylenebis-salicylic acid, condense it with ethylenediamine, and cha…
This study examines how pyrolysis temperature affects the yield and composition of lower phenols obtained from Leninsk gas coal of the Kuznetsk Basin. Coal was thermally processed in an enlarged laboratory furnace at 600, 700, and 800°C, with product yields, tar group composition, phenol extraction,…
This study examines how iron ore and limestone flux additions affect the yields of products from peat semi-coking, a question relevant to fuel-smelting materials intended for metallurgical use with recovery of gas and tar. Fuel-smelting mixtures based on Tagan peat, Bakchar iron ore, and limestone w…
This paper examines the use of peat as a metallurgical fuel and proposes producing peat-based fuel-smelting materials that combine fuel, iron ore, and fluxes in proportions suitable for blast-furnace operation. The method involves grinding high-moisture raw peat, mixing it with finely ground ore and…
The article examines prospects for developing metallurgy and chemical production in Tomsk Oblast by linking the Bakchar iron-ore deposit with the region’s large peat reserves. It argues that shortages of coking coal make conventional blast-furnace development difficult, and proposes comprehensive us…
The paper addresses transient heat conduction in bodies heated by a radiating medium whose temperature varies with time, a problem complicated by the nonlinear radiative boundary condition. The authors approximate this boundary condition by expanding it in a binomial series and retaining the first t…
This paper develops substitutions for stationary heat conduction boundary value problems governed by Laplace’s equation with mixed prescribed temperature and convective boundary conditions. The authors show, in Cartesian, cylindrical, and spherical coordinates, that suitable transformations convert …
This paper examines the accuracy required in two-position on and off temperature control when the controlled variable inside a heated body differs from the oscillations measured or imposed at its surface. Using the one-dimensional heat conduction equation with periodic boundary conditions, it derive…
This paper examines the calculation of heat drop during adiabatic expansion, or outflow, of boiling water, a quantity needed for determining velocity and flow rate. It shows that direct use of standard tabulated enthalpy and entropy values in the usual thermodynamic expression can give zero, negativ…
This paper examines the calculation of flow parameters during adiabatic vaporization of heated water, emphasizing the difference between isentropic and isoenthalpic pressure release in different evaporating elements. Using experimental measurements of pressure, temperature, flow velocity, and flow r…
The paper addresses the steady-state temperature field in a plane thick-walled shield whose boundary heat exchange is governed by the Stefan-Boltzmann radiation law, a case for which direct trial selection can be cumbersome. It formulates the one-dimensional conduction problem with possibly temperat…
