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The static longitudinal and transverse gluon propagators in the Landau gauge are studied in 2+1 lattice QCD with nonzero isospin chemical potential μI. Parameterization of the momentum dependence of the propagators is provided for all values of the chemical potential under study. We find that the longitudinal propagator is infrared suppressed at nonzero μI with suppression increasing with increasing μI. It is found, respectively, that the electric screening mass is increasing with increasing μI. Additionally, we analyze the difference between two propagators as a function of the momentum and thus compare interactions in chromoelectric and chromomagnetic sectors.

Alkali resistance is a critical factor for the long-term performance of glass fibers in cementitious composites. While zirconium oxide doping has proven effective in enhancing the durability of basalt fibers, its high cost and limited solubility motivate the search for viable alternatives. This study presents the first systematic investigation of titanium dioxide (TiO2) doping in basalt-based glasses across a wide compositional range (0–8 mol%). X-ray fluorescence and diffraction analyses confirm complete dissolution of TiO2 within the amorphous silicate network, with no phase segregation. At low concentrations (≤3 mol%), Ti4+ acts as a network modifier in octahedral coordination ([TiO6]), reducing melt viscosity and lowering processing temperatures. As TiO2 content increases, titanium in-corporates into tetrahedral sites ([TiO4]), competing with Fe3+ for network-forming positions and displacing it into octahedral coordination, as revealed by Mössbauer spectroscopy. This structural redistribution promotes phase separation and triggers the crystallization of pseudobrukite (Fe2TiO5) at elevated temperatures. The formation of a protective Ti(OH)4 surface layer upon alkali exposure enhances chemical resistance, with optimal performance observed at 4.6 mol% TiO2—reducing mass loss in NaOH and seawater by 13.3% and 25%, respectively, and improving residual tensile strength. However, higher TiO2 concentrations (≥5 mol%) lead to pseudobrukite crystallization and a narrowed fiber-forming temperature window, rendering continuous fiber drawing unfeasible. The results demonstrate that TiO2 is a promising, cost-effective dopant for basalt fibers, but its benefits are constrained by a critical solubility threshold and structural trade-offs between durability and processability.

A possibility of using a monitor calibrator for the determination of luminescent compounds is shown on an example of quinine. The determination is based on the irradiation of a sample with broadband radiation in the visible and near UV spectral regions from a built-in source exciting phosphor molecules and the simultaneous registration of the radiation incident on the detector. Measurement conditions are selected. Quinine can be determined in the range of 60−750 µM, the limit of detection is 20 µM. The determination is not affected by common inorganic ions, as well as sweeteners and acidity regulators present in many beverages. The developed method of determination is applicable to the analysis of carbonated drinks and drugs. Compared to a traditional spectrofluorimeter, monitor calibrator is characterized by compactness, mobility, ability of detecting luminescence in cuvettes of various sizes and shapes, and lower cost.

The article studies the efficiency of the subsoil broadcast seeding of grain crops, which differs from other methods with the way seeds are placed into the soil: not in rows but on the whole distributing width. This method is also determined by the evenness of seeding depth by placing the seeds on the ready hard spot, which provides equal conditions of heat, light, water, food and gas supply that influence seed sprouting, seedling formation, tillering, shooting, head formation, earing, blossoming, kernel milk line formation, middle dough and fully ripe stage development. The analysis of coulter with active and passive distributors has been conducted. The use of air flow during the transportation of seeds from the sowing device to the coulter and the distributor oscillating process is recommended for the higher quality seed distribution below the spinning wheel. The oscillations of the elastic tube - distributor under the influence of the air-grain mixture have been theoretically studied. The obtained results allow creating dependency diagrams of oscillation frequency ω and damping parameter h. The experimental research has been made to study the evenness of seed distribution with the help of the coulter with the elastic tube - distributor.

In this paper, the behavior of an argon inductively coupled plasma is investigated. Studies have been carried out by means of high-speed shooting of the process of ignition and combustion of unloaded plasma. The velocity of axial rotation of the plasma torch is estimated and the distribution of the intensity of the glow in the cross-section is analyzed.

A 90WC-10Co powder mixture with TaC, VC and Cr3C2 grain growth inhibitors with average particle size about 50 nm was produced by deposition of Co. Two different sintering techniques had been used for consolidation. Microhardness and fracture toughness measurements of sintered materials had showed agreement with Hall-Petch equation. The corrosion behavior was investigated in neutral and acid solutions by electrochemical methods. The observed pseudo-passive transition had been associated with the so-called salt passivity - formation of cobalt sulfate salt layer on hard alloy surfaces.

This article presents the history of the Visual Survey Group (VSG)—a Professional-Amateur (Pro-Am) collaboration within the field of astronomy working on data from several space missions (Kepler, K2 and Transiting Exoplanet Survey Satellite). This paper covers the formation of the VSG, its survey-methods including the most common tools used and its discoveries made over the past decade. So far, the group has visually surveyed nearly 10 million light curves and authored 69 peer-reviewed papers which mainly focus on exoplanets and discoveries involving multistellar systems. The preferred manual search-method carried out by the VSG has revealed its strength by detecting numerous objects which were overlooked or discarded by automated search programs, uncovering some of the most rare stars in our galaxy, and leading to several serendipitous discoveries of unprecedented astrophysical phenomena. The main purpose of the VSG is to assist in the exploration of our local universe, and we therefore advocate continued crowd-sourced examination of time-domain data sets, and invite other research teams to reach out in order to establish collaborating projects.

The schematic diagram and design of an electrostatic lens for correction and additional focusing of a beam coming out of a magnetron-type ion source are described. A drawing of such a lens is presented.

Alkali resistance is a critical factor for the long-term performance of glass fibers in cementitious composites. While zirconium oxide doping has proven effective in enhancing the durability of basalt fibers, its high cost and limited solubility motivate the search for viable alternatives. This study presents the first systematic investigation of titanium dioxide (TiO[sub.2]) doping in basalt-based glasses across a wide compositional range (0–8 mol%). X-ray fluorescence and diffraction analyses confirm complete dissolution of TiO[sub.2] within the amorphous silicate network, with no phase segregation. At low concentrations (≤3 mol%), Ti[sup.4+] acts as a network modifier in octahedral coordination ([TiO[sub.6]]), reducing melt viscosity and lowering processing temperatures. As TiO[sub.2] content increases, titanium in-corporates into tetrahedral sites ([TiO[sub.4]]), competing with Fe[sup.3+] for network-forming positions and displacing it into octahedral coordination, as revealed by Mössbauer spectroscopy. This structural redistribution promotes phase separation and triggers the crystallization of pseudobrukite (Fe[sub.2]TiO[sub.5]) at elevated temperatures. The formation of a protective Ti(OH)[sub.4] surface layer upon alkali exposure enhances chemical resistance, with optimal performance observed at 4.6 mol% TiO[sub.2]—reducing mass loss in NaOH and seawater by 13.3% and 25%, respectively, and improving residual tensile strength. However, higher TiO[sub.2] concentrations (≥5 mol%) lead to pseudobrukite crystallization and a narrowed fiber-forming temperature window, rendering continuous fiber drawing unfeasible. The results demonstrate that TiO[sub.2] is a promising, cost-effective dopant for basalt fibers, but its benefits are constrained by a critical solubility threshold and structural trade-offs between durability and processability.

This work presents results of studying specifics of structure and properties of 04Cr18Ni9 steel formation in additive processes, namely, in СМТ (Сold Меtal Тransfer) additive manufacturing and plasma additive manufacturing at reverse polarity current and consumable electrode plasma additive manufacturing (Plasma MIG). The main problem that arises when additive technologies are applied is to ensure that properties of laminates are no lower than those produced using traditional methods. Typical defects of laminates produced by additive manufacturing are increased porosity, nonmetallic inclusions, reduced plasticity, and for high-alloy steels, loss of special properties. The work includes a comparison in structure and mechanical characteristics of materials obtained by CMT additive manufacturing, plasma additive manufacturing at reverse polarity current, and consumable electrode plasma additive manufacturing. It is established that mechanical characteristics of samples made of 04Cr18Ni9 steel obtained by additive manufacturing are no lower than those of steel of similar composition in the deformed state.