From tunneling to photoemission: correlating two spaces

Correlating the data measured by tunneling and photoemission spectroscopies is a long-standing problem in condensed matter physics. The quasiparticle interference, recently discovered in high-Tc cuprates, reveals a possibility to solve this problem. Application of modern phase retrieval algorithms to Fourier transformed tunneling data allows to recover the distribution of the quasiparticle spectral weight in the reciprocal space of solids measured directly by photoemission. This opens a direct way to unify these two powerful techniques and may help to solve a number of problems related with space/time inhomogeneities predicted in strongly correlated electron systems.Comment: more info at http://www.imp.kiev.ua/~kord/AC-ARPES/index.htm

Ion composition and qualitative indicators of water within the Chernozemelskaya water-irrigation system

In Russia, the agro-industrial complex is a large consumer of water resources, which are used to supply water to rural settlements, food and processing industries, livestock complexes and poultry farms, irrigation of land, flooding of pastures and haylands, as well as for fishing, recreation and other purposes. To a large extent, the environmentally safe, cost-effective and socially oriented development of the region depends on the state and functioning of reclamation systems. The paper presents the results of long-term monitoring of the geochemical composition and water quality indicators of the Chernozemelskaya water-irrigation system (from 2002 to 2018) located on the territory of the Caspian lowland. Irrigation and drainage and surface waste of the system are found to have a level of mineralization ranging from 1.2 to 2.3 g/l with sulfate-chloride and chloride-sulfate, sodium chemism, while the medium activity is low and intermediate-mafic (pH=7.8-8.4). It is analyzed that the high level of Cl-, Na+, Мg2+ ions in irrigation water can cause salinization and alcalination of all types of soils. © 2020 Institute of Physics Publishing. All rights reserved

The Influence of Multiwalled Carbon Nanotubes on the Behavior of Mammals after Single Intrapharyngeal or Intravenous Exposure

© 2020, Pleiades Publishing, Ltd. Abstract: The toxic effects of multiwalled carbon nanotubes (MWCNTs) in mammals are important to assess due to MWCNTs are a widespread environmental pollutant. MWCNTs were tested for the effect on the behavioral functions of laboratory mice in the open field, rotarod, and elevated plus maze tests. Two possible routes of MWCNT entry into the body were examined: intrapharyngeal aspiration and intravenous administration, in order to model the most common ways of MWCNT entry, through the lungs and by assimilation from the blood through blood–tissue barriers. The potential toxin was administered once intrapharyngeally at 20 μg per mouse or intravenously at 0.2 μg per mouse. Acute and delayed effects were evaluated 24 h and 30 days after administration. Latent emotional tension and weaker exploratory reactions were observed 24 h after intrapharyngeal MWCNT aspiration. Signs of stress were still detectable 30 days after exposure. In contrast, an increase in locomotor and exploratory activities was observed 24 h after intravenous MWCNT administration. The result was explained by an inhibitory MWCNT effect on the lower respiratory tract and a potential lack of MWCNT accumulation in organs because MWCNTs were relatively large in size and could not penetrate through blood–tissue barriers

Numerical simulation of loads and impacts, stress-strain state, strength and stability of unique structures, buildings and facilities. Experience of StaDyO research & engineering centre

The paper contains analytical overview of the most important unique/critical objects and the computational analysis problems of the mechanical safety, carried out by the team of Research & Development Centre StaDyO (StaDyO R&D Centre) researchers for the last two years (2016-2018). Corresponding complex coupled problems of continuum mechanics were solved with the use of contemporary methods and models of numerical modeling (nonlinear models, coupled problems, substructures, submodeling, etc.), implemented in verified software complexes. Some of these results are briefly considered and analyzed. Conclusions about the main directions of further research and development are presented as well. © Published under licence by IOP Publishing Ltd