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Geochemical studies of Inikan Formation rocks from the coastal outcrops of the Yudoma River were carried out. All analyzed lithological varieties are characterized by significant enrichment in B, Ni, Mo, Ag, Sb, U (redox-sensitive trace metals and elements associated with biodeposition). The source of the elements was sea water that leached them from the eolian material. It was found that the deposits accumulated in anoxic environments with periods of both euxinic (probably, in the bottom water mass) and suboxic conditions. Such anoxic and euxinic conditions developed due to the stable stratification of the ocean that existed in the early-middle Cambrian in this part of the basin. In addition, the long-term accumulation of organic-rich sediment under conditions of anoxia, periodic euxinia, and stable stratification indicates the presence of a geomorphologically isolated depression in this part of the basin. CIA-Kcorr ranges from 68 to 95. The low values of the CIA may be related to the height of the relief in the sedimentary source area.

This study presents a comprehensive analysis of the Balkassar oilfield in the Potwar Basin, Pakistan. It integrates seismic reflection data, a 3D subsurface horizon model, and geochemical and petrophysical data. Evaluating the Lockhart Formation’s geochemical properties using well cuttings reveals consistent patterns of relatively low to fair total organic carbon (TOC). S2 values suggest a fair generation potential with a mixed Type II-III kerogen composition. Seismic facies analysis identifies five distinct categories with parallel attributes. Horizons from lower Permian to Eocene show varying amplitudes and prevalent parallel to wavy internal configurations. Geometries, mainly sheet-to-wedge, enhance stratigraphic understanding. The 3D seismic interpretation reveals the Lockhart Formation’s structural traits, with pronounced northwest dip and gentler southeast inclination. Faults flanking the formation truncate its limbs. A significant contour closure in the northwest, confined by fault boundaries, signifies attractive hydrocarbon potential. Petrophysical analysis indicates an average 9.17% porosity. Dominated by limestone, the formation shows average water saturation of around 25.29% and hydrocarbon saturation of roughly 74.71%, indicating favorable reservoir properties. The Lockhart Formation holds promise as a reservoir rock within the Potwar Basin, though its source rock suitability is limited. This study enhances understanding of Balkassar’s geological complexities and contributes to knowledge of hydrocarbon exploration in the Potwar Basin.

Different approaches to tectonic zoning and different types (complexes) of used data, on the basis of which the zoning is performed, cause the plurality of tectonic schemes of Kamchatka and the Kamchatka region previously obtained by different authors. In this work, a joint analysis of gravity field anomalies, gravity field and relief transforms, magnetic field and modern seismotomographic models of velocity anomalies was used to study spatial relationships of tectonic manifestations of geological processes. As a result of this study, a linear-block type tectonic scheme was constructed. The obtained linear structural elements are in good agreement with the data of potential fields, results and previously published materials. The productivity of the presented method of complex analysis of geophysical fields for revealing their spatial relations and block structures of the environment is shown. The analysis outcomes can be used to establish spatial constraints for gravity field sources when solving inverse problems, potential field separation problems and their detailed geological interpretation.

The characteristics of the combustion process of liquid (diesel) fuel in a high-speed jet of superheated water vapor in the combustion chamber of a hot water boiler are studied at a thermal power of the burner device approximately equal to 40 kW. It is shown that the burner device, created on the basis of the technology of fuel atomization with a steam jet, meets modern technical and environmental standards and has a number of advantages over analogues. It has been established that the addition of steam makes it possible to reduce the concentration of CO and NO_x in combustion products several times. At the same time, the volume of emissions of carbon monoxide and nitrogen oxides when using the burner design under study is significantly (2.5 and 1.4 times, respectively) less than when using a serial analogue of the Weishaupt burner device. Recommendations for optimizing the operation of such devices are presented.

This paper presents the results of an experimental study of the breakup of a jet consisting of two coaxial jets of immiscible liquids with varying phase flow rates. Distilled water and a mixture of polymethylsiloxanes were used as working liquids. The regimes of jet breakup, the types of capsules formed, and the sizes of single-chamber capsules formed under the influence of capillary instability were determined. The natural frequencies of surface instability were measured.

Results of tensile and low-cycle fatigue testing of samples made of an aluminum-lithium alloy of the Al-Mg-Li system obtained by plasma-assisted laser cutting performed by a pulsed CO₂ laser in an argon jet with the laser beam and optical discharge plasma simultaneously affecting the material are reported. Low-cycle fatigue tests show that the number of loading cycles survived by the sample obtained by plasma-assisted laser cutting is more than twice greater than the number of cycles survived by the samples obtained by conventional laser cutting with continuous radiation.

This paper presents a solution of the two-dimensional non-stationary problem of the development of wave motion in a two-layer liquid of finite depth under ice cover modeled by a thin elastic plate taking into account longitudinal compression forces. The cases are considered where, in the unperturbed state, one of the layers is at rest and in the other (top or bottom) layer, the horizontal flow velocity varies linearly in thickness. Dispersion dependences were determined for three wave modes arising in the presence of shear flow. The vertical deflections of the ice cover due to a pulsating source of disturbances located in an initially motionless layer of liquid were calculated. A special case is also considered where the liquid is bounded at the top by a solid lid. The problem is considered in a linear formulation, and the liquid is assumed to be ideal and incompressible.

The influence of the jet pressure ratio ( n =1.18÷3.35) in a nonisobaric supersonic jet of a vibrationally excited gas SF6 exhausting from a convergent axisymmetric nozzle 0.25 mm in diameter is studied numerically and experimentally. The experiments aimed at studying the gas-dynamic structure of the jets are performed in a specially designed jet setup of the Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences. The numerical simulations are performed by solving two-dimensional Navier-Stokes equations within the framework of the ANSYS Fluent software and the thermally perfect gas model. The influence of excitation of vibrational degrees of freedom of the SF6 gas is studied in both an equilibrium gas and vibrationally nonequilibrium gas. The nonequilibrium state of vibrational degrees of freedom is simulated with the use of a two-temperature model of relaxation flows. It is shown that the jet pressure ratio of the SF6 gas affects the length of the wave structure cells, which is responsible for the change in the vibrational relaxation rate. The coefficient of density amplitude reduction in gas-dynamic cells is derived as a function of the jet pressure ratio.

The movement of dissolved salt in melting snow is considered based on the equations of non-isothermal two-phase filtration. The thermal conductivity of snow and dependence of the water freezing temperature on salinity were verified against available experimental data. The influence of the presence of dissolved salt on the phase transition was evaluated by numerical experiments.

The influence of the amplitude of deflectors introduced into a laminar jet flow on the coefficient of linear change in the radial component of a stationary disturbance is investigated. The method for introducing disturbances and the method for measuring them are described. It is shown that a decrease in the amplitude of the deflectors does not lead to a change in the flow pattern, does not prevent the occurrence of an algebraic growth mechanism, and causes a proportional decrease in the radial component of the stationary velocity disturbance. The transition to the turbulent regime occurs after reaching a certain value of the radial expansion, which does not depend on the initial amplitude of the introduced disturbance.