•The lattice of diluted magnetic semiconductor (DMS) quantum rings as a system with paramagnetic-like properties.•In DMSs the “Aharonov-Bohm compensation points” positions depend on the Mn ion ...concentration.•The “Aharonov-Bohm compensation point” number decreases in compared with the case of Mn concentration x = 0.
In the present work, we consider magnetic properties of the non-interacting diluted magnetic semiconductor (DMS) quantum ring lattices applying the 2D rotator model. The exchange interaction and the Zeeman term effect on the magnetic moment is taking into account. For this purpose, the exact analytic expression for the single-particle partition function is found and it used to determine the magnetic moment. We show that magnetization in DMS quantum ring sharp changes with a small increase in temperature and after a peak the magnetization starts to decrease.
The flow of a viscous compressible gas from the apex of a flat wedge is considered. It is shown that an asymmetric self-similar flow is possible and is realized when special boundary conditions for ...the temperature of the channel walls are specified. For the case of low subsonic gas-flow velocities at constant but different temperatures of the wedge walls, an asymptotic solution is found. In the general case, the resulting system of ordinary differential equations is solved numerically.
Introduction. The paper discusses the advantages and features of the main existing methods of connecting wooden columns and crossbars.Materials and methods. It was proposed to increase ...the load-bearing capacity and reduce the deformability of joints by modifying the joints with the introduction of epoxy resin between the screw and the wood and between the overlay and the end of the wooden element to which it is attached and modifying the design of the overlays.Results. As a result, a constructive solution for connecting wooden columns and crossbars was developed, which has increased reliability compared to the studied connections and is free of their disadvantages. This result was achieved due to the presence of an adhesive layer between the screw and the wood, as well as between the overlay and the wooden element, the making of notches on the sides of the overlays attached to the wooden elements, the increased length of the screws screwed into the overlay with a groove, compared to the length of the screws screwed into an overlay with a tenon, placement of holes for screws at an angle of 90° to the surface of the overlay into which the screws are screwed.Conclusions. An urgent issue is the development of constructive solutions for connections of wooden elements, in particular the interfaces of columns and crossbars. The paper discusses the advantages and features of the main existing methods of connecting wooden columns and crossbars.
A two-dimensional flow of a viscous compressible gas from a source located at the apex of a flat wedge is considered. In the case of adiabatic walls and transfer coefficients arbitrarily depending on ...temperature, the possibility of self-similar solutions is established. The new analytical solutions are compared with the previous solutions for the gas with constant transfer coefficients. For gas flows in micronozzles, the self-similar solutions obtained in this work are compared with the results obtained by other authors.
As drug-related epidemics have expanded from cities to rural areas, syringe service programs (SSPs) and other harm reduction programs have been slow to follow. The recent implementation of SSPs in ...rural areas demands attention to program fidelity based on core components of SSP success.
Semistructured interviews conducted with clients and staff at 5 SSPs in 5 counties within 2 Central Appalachian health districts. Interviews covered fidelity of SSP implementation to 6 core components: (1) meet needs for harm reduction supplies; (2) education and counseling for sexual, injection, and overdose risks; (3) cooperation between SSPs and local law enforcement; (4) provide other health and social services; (5) ensure low threshold access to services; and (6) promote dignity, the impact of poor fidelity on vulnerability to drug-related harms, and the risk environment's influence on program fidelity. We applied thematic methods to analyze the data.
Rural SSPs were mostly faithful to the 6 core components. Deviations from core components can be attributed to certain characteristics of the local rural risk environment outlined in the risk environment model, including geographic remoteness, lack of resources and underdeveloped infrastructure, and stigma against people who inject drugs (PWID) CONCLUSIONS: As drug-related epidemics continue to expand outside cities, scaling up SSPs to serve rural PWID is essential. Future research should explore whether the risk environment features identified also influence SSP fidelity in other rural areas and develop and test strategies to strengthen core components in these vulnerable areas.
Chiral Effects in Quantum Rotor Systems Bubenchikov, M. A.; Kaparulin, D. S.; Ibragimov, R. A. ...
Russian physics journal,
06/2023, Volume:
66, Issue:
2
Journal Article
Peer reviewed
The statistical mechanics and thermodynamics of a system of symmetric rigid quantum rotors in the field of centrifugal forces are considered. Using the theory of canonical ensembles, we find ...one-particle distribution function, and the partition function and thermodynamic potential are expressed as a function of temperature and angular velocity. The equation of state in the angular velocity–angular momentum–temperature coordinates is explicitly found in the high-temperature and ultra-cold cases. The macroscopic parameters of the system show a dependence on the angular velocity, so the chiral effects are present in the system. The magnitude of chiral effects is estimated. The entropy and angular momentum graphs are plotted in the ultra-cold case.
The article examines the issue of suspension from blood donation and discusses their causes in persons who applied to blood service institutions. It was revealed that for 3 years, on average, 13% of ...those who applied were not allowed to donate. Of the total ineligible, 10% were temporarily suspended from donating. The main part of them - 8% due to low hemoglobin levels.
A method has been developed for the selective, simple and accelerated extraction-photometric determination of silver, based on the selective extraction of silver (I) from a strongly acidic medium in ...the presence of iodide ions and dimethylformamide and its complexation with dithizone directly in the organic phase. The apparent molar extinction coefficient of the dithizone complex of silver (I) at a maximum light absorption of 495 nm is 3.46·10
4
. The calibration graph is linear in the range of 0.5-50 mkg of silver (I) in 10 ml of extract. The determination of silver is not interfered with by large amounts of foreign ions in 100,000 multiples within the range of 2-5%. The developed extraction-photometric method for the determination of silver is recommended for the analysis of silver in ores, rocks, industrial waste and other materials with complex chemical composition without separating accompanying elements.
—The basic principles of the development of an astroclimatic facility using commercially available standard technical solutions to allow rapid production and unlimited replication are outlined. The ...facility includes an equatorially-mounted
mm,
Ritchey–Chretien telescope with a dome, cloud sensor, and an automatic weather station. The proposed device for studying the parameters of atmospheric turbulence including the altitude profile consists only of a Shack–Hartmann sensor with a
cm subaperture. The feasibility of such an approach has been confirmed by recent studies and our numerical simulations.
