We analyse a modified set of renormalisation group equations for disordered spinful fermions described by the Luttinger liquid model. The modification is necessary to take special care of the ...factitious admixture of the disorder to the interaction coupling constants undergoing renormalisation. Only properly separated amplitudes of elastic and inelastic processes allow the identification of true phases and the construction of the phase diagram (a similar procedure has been earlier implemented for the spinless case). In the spinful case, these modified equations enable us to demonstrate that in some region of the bare parameters values the phase diagram contains two massive phases, charge (CDW) and spin (SDW) density waves, which are separated by an insulating phase. These gapped phases are achieved at finite critical temperatures that vanish at the phase boundaries indicating the presence of a disorder-induced quantum phase transition. The critical temperatures as a function of disorder are reasonably well fit by a stretch exponential with the universal stretching critical exponent ν=1/3. A quantum phase transition between CDW and SDW phases driven by disorder strength has not been predicted before and this observation must be taken into account when analysing recent multiple experiments on phase transitions in quasi-one-dimensional structures.
•A disorder-induced quantum phase transition in a spinful one-dimensional model.•A disorder-induced transition between spin and charge density wave phases.•Second order phase transition via a universal critical exponent.•Tricritical point between an insulator and spin and charge density wave phases.
We provide analytical and numerical evidence that the attractive two-dimensional Kitaev model on a lattice with mirror symmetry demonstrates an unusual 'intrinsic' phase at half filling. This phase ...emerges in the phase diagram at the boundary separating two topological superconductors with opposite Chern numbers and exists due to the condensation of non-zero momentum Cooper pairs. Unlike Fulde-Ferrell-Larkin-Ovchinnikov superconductivity, the Cooper pairs momenta are lying along two lines in the Brillouin zone meaning simultaneous condensation of a continuum of Cooper pairs.
Abstract
The article aims to develop a neural model for digital air traffic control. The proposed approach uses the concept of socio-cyber-physical self-organization of distributed organizational and ...technical system, whose components are connected to 4G and 5G generation wireless networks. The advantage of the approach is complex integration of promising analytical management principles and their representation in hybrid intellect.
Artificial hybrids between cultivated
species and wild
that possess genes for resistance to biotic and abiotic stresses can be important for oat breeding. For the first time, a comprehensive study of ...genomes of artificial fertile hybrids
×
and their parental species was carried out based on the chromosome FISH mapping of satellite DNA sequences (satDNAs) and also analysis of intragenomic polymorphism in the 18S-ITS1-5.8S rDNA region, using NGS data. Chromosome distribution patterns of marker satDNAs allowed us to identify all chromosomes in the studied karyotypes, determine their subgenomic affiliation, and detect several chromosome rearrangements. Based on the obtained cytogenomic data, we revealed differences between two
subgenomes and demonstrated that only one of them was inherited in the studied octoploid hybrids. Ribotype analyses showed that the second major ribotype of
was species-specific and was not represented in rDNA pools of the octoploids, which could be related to the allopolyploid origin of this species. Our results indicate that the use of marker satDNAs in cytogenomic studies can provide important data on genomic relationships within
allopolyploid species and hybrids, and also expand the potential for interspecific crosses for breeding.
The relevance of the research is caused by the increased necessity to solve ecological issues in Russian Arctic regions considering their importance for the development of the country. On the one ...hand, the task complexity lies in the presence of cumulative environmental damage; on the other hand, in the topicality of elaborating sustainable approaches to natural resource development in the immediate future. The main aim of the research is to analyze the condition of the ecosystem and its separate components in the Norilsk industrial area as one of the significant resource territories in the Russian Arctic. Special attention is made to techniques of monitoring the environment and official documents regulating ecology that require the elimination of acute contradictions and legislative vacuum. Methods of research include analyses of research papers published in Russian and foreign sources in the last decade on environmental challenges in the Russian Arctic and especially in the Norilsk industrial area. The authors used a wide range of bibliographic systems including the Russian Science Citation Index, Scopus, and “Environment protection” abstract service by All-Russian Institute of Scientific and Technical Information. Research results: Unique characteristics of Arctic regions were revealed that require both non-traditional technological concepts when conducting an industrial activity, and special approaches when regulating and controlling ecological state. The example of the Norilsk industrial area was used to demonstrate improvements in ecological aspects of industrial activity of mining and smelting enterprise even despite the incident with a fuel spill in 2020. At the same time, the attempted measures are still insufficient to regard the current ecological situation as satisfactory. The problems of neutralization of cumulative environmental damage have awaited solutions. The efficiency of planned measures for improvement of the state of the environment essentially depends on changes in legal acts poorly considering specific features of Arctic territories, as well as on closer collaboration of industrial enterprises both with the scientific community and local residents.
The paper refers to the mechanisms of emission of noble metals taking into account the specifics associated with the two-temperature state of matter. The emission is caused by the action of an ...ultrashort infrared laser pulse. It is shown that the two-temperature state results in two effects contributing to the radiated emission of hot electrons. The first effect is interband radiative recombination of electrons induced by thermal smearing of the Fermi distribution of conduction-band electrons. The second effect is radiation of hot conduction-band electrons in case of inelastic electron-phonon interaction. This effect is due to the fact that thermal smearing of the Fermi distribution of conduction-band electrons, taking into account the electron-phonon interaction, and in the presence of strong near fields, enables intraband radiative transitions for electrons in the sp-band.
The article presents the results of the study of sulfur-containing gases (carbon disulfide, CS
2
, and dimethyl sulfide, C
2
H
6
S) in the air above the sulfide tailings and in the soils in ...Komsomolsk settlement. Concentrations of CS
2
(gas of the second hazard class) and C
2
H
6
S (gas of the fourth hazard class) in the air above the tailings exceeded the average maximum permissible on-time concentration (MPCot) by 20 times and 9 times, accordingly. Because of the alarming medical statistics on childhood morbidity, vegetable gardens in houses in the settlement were selected for measuring gas concentrations and metal contents. Concentrations of CS
2
varied from 2.2 to 27 µg/m3 and exceeded MPCdn at 24 locations out of the 31 selected points. Concentrations of C
2
H
6
S varied from 120 to 440 μg/m3 and exceeded MPCot at 9 out of the 31 points. Particularly high gas concentrations were detected at a school and kindergarten. Geochemical study showed high concentrations of arsenic, zinc, and lead in garden soils compared to their background values. Mathematical models of the distribution of hazard indices indicated that about 633 residents of Komsomolsk are at risk of diseases related to respiratory organs and liver damage, and approximately 215 inhabitants of Komsomolsk are exposed to the combined effects of CS
2
and C
2
H
6
S and are at a risk of neurotoxic disorders.
This article presents the results of field and laboratory experiments performed to determine the compositions of gases in the air above the Komsomolsk sulfide tailings. Concentrations of SO2 were ...measured using a GANK-4 portable gas analyzer. The possibility of the gaseous transport of trace elements was estimated by pumping air through a bubbler with an absorber. Qualitative analyses of sulfur gases (CS2, C2H6S2, C2H6S3, S8, S7, and S6) were performed using a field chromatography-mass spectrometer. The SO2 concentrations in the air above the surface of the Komsomolsk tailings can reach up to 2.5mg/m3 and vary significantly during the day, depending on the difference between the temperature of the tailings surface and that of the ambient air. A wide range of chemical elements (i.e., rock-forming elements, metals, and anionic elements) can migrate with the gaseous phase from both sulfide tailings and background sites. Correlation analysis indicates that the main source of trace elements in gas streams from tailings material is unstable crystalline hydrates, which are represented by sulfates and sulfarsenates of Al, Fe, Mg, Zn, and Cu. The emissions of alkaline and alkaline earth elements are mainly caused by the compositions of pore solutions. Volatile sulfur compounds, including sulfur dioxide, carbon disulfide, dimethyl disulfide, and dimethyl trisulfide, as well as elemental sulfur, are the products of microbiological activity. The results obtained here indicate that the gas phase above the surface of the sulfide tailings has a complex composition and that many chemical elements may be transferred by gases under low-temperature conditions.
Display omitted
•Sulfide tailings are a constant source of Cu, Zn, Cd, As, and Sb etc. in the air.•Secondary minerals and pore solutions are sources of elements in the gas streams.•SO2, CS2, C2H6S2, C2H6S3, S6–8 are probably the products of microbiological activity.•The elemental emission of sulfur from tailings has not previously been discussed.
The morphological, meiotic and chromosomal variability were studied in two cultivars of Calendula officinalis L. and their mutant lines obtained though chemical mutagenesis using diethyl sulphate ...(DES) (0.04%, 0.08%) and dimethyl sulphate (DMS) (0.025%, 0.05%). The studied cultivars displayed different sensitivity to DMS and DES mutagens. More M1 plants with morphological changes were observed in C. officinalis cv. 'Zolotoe more' than in cv. 'Rajskij sad'. DMS and DES at low concentrations had positive effects on main agro-metrical traits in both cultivars including plant height, inflorescence diameter and number of inflorescences per plant. Dose-dependent increase in number of various meiotic abnormalities was revealed in both mutant lines. Comparative karyotype analysis and FISH-based visualization of 45S and 5S rDNA indicated a high level of karyotype stability in M1 and M2 plants. Seed treatments with DMS and DES at certain concentrations resulted in higher yields of inflorescences in M1 plants compared to the control. In M2 generation, dose-dependent reduction in the yields of inflorescences was observed. Our findings demonstrate that DMS and DES at low concentrations have great potential in calendula mutation breeding.
PDF
