Temperature dependent photoluminescence of single CdS nanowires

Temperature dependent photoluminescence (PL) is used to study the electronic properties of single CdS nanowires. At low temperatures, both near-band edge (NBE) photoluminescence (PL) and spatially-localized defect-related PL are observed in many nanowires. The intensity of the defect states is a sensitive tool to judge the character and structural uniformity of nanowires. As the temperature is raised, the defect states rapidly quench at varying rates leaving the NBE PL which dominates up to room temperature. All PL lines from nanowires follow closely the temperature-dependent band edge, similar to that observed in bulk CdS.Comment: 11 pages, 4 figure

Low temperature photoluminescence imaging and time-resolved spectroscopy of single CdS nanowires

Time-resolved photoluminescence (PL) and micro-PL imaging were used to study single CdS nanowires at 10 K. The low-temperature PL of all CdS nanowires exhibit spectral features near energies associated with free and bound exciton transitions, with the transition energies and emission intensities varying along the length of the nanowire. In addition, several nanowires show spatially localized PL at lower energies which are associated with morphological irregularities in the nanowires. Time-resolved PL measurements indicate that exciton recombination in all CdS nanowires is dominated by non-radiative recombination at the surface of the nanowires.Comment: 9 pages, 3 figures, to be published in Applied Physics Letter

Conditions for the formation of a non-autonomous phase at the structural deformation of complex vanadium oxides

Received: 02.03.2018. Accepted: 10.04.2018. Published: 10.05.2018.A new previously unknown effect of a reversible transition from a singlephase system to a heterophase system containing a non-autonomous phase was observed during thermal and chemical deformations of the Zn2–2xCd2xV2O7 structure.The role of local symmetry in the formation of the non-autonomous phase is shown on the basis of X-ray diffraction studies in situ and a comparative crystal-chemical analysis of the structural deformations of isoform monoclinic solid solutions of zinc and copper pyrovanadates with zero volumetric thermal expansion.The work was supported by UB RAS (project 18-10-3-32)

Cytokine net role in mechanisms of neuroimmune interaction (literature review)

This work deals with the literature review on the problems associated with the progress of the national and foreign authors in studying the role of the cytokine net in the pathogenetic mechanisms of forming the diseases of the nervous system. Studying the peculiarities in the functions of a number of the immune system indices as the targets of the combined exposure to the production and other factors are known to be the actual aspect of the works analyzed in the recent years. A special attention in the literature studied is paid to the intersystem interactions between the nervous and the immune systems and. the immune systems and. the value of their homeostasis. The literature deals with the causes of the injuries and/or the cellular death of the nervous system and, as the consequence, the function changes of other organism systems and the production of their activity products. The change regularities in the pro-inflammatory cytokines (IL-1β, TNF-α, IL-6 and IL-12) in the diseases of different etiology including those which were stipulated by the factors of the production environment and other factors on the example of the multiple sclerosis as the neurodegenerative disease are represented in this paper. The possibilities of the disease objectify of the nervous system and the determination of their process severity in the clinical praxis based on the immunological indices and the patient complaints are given in this work. The studies testifying the different mechanisms of the autoimmune response realization in exposure to the neuro toxicant of different etiology are represented in this paper as well as the direct correlation between the antibody content to the proteins of the nervous tissue and the production of the pro-inflammatory cytokines has been revealed. At the same time, the common morpho-functional regularities of the changes in the central nervous system of the albino rats in the post-contact period as a result of the exposure to the metallic mercury vapors and. sublimate including the persons examined working at the production were indicated. In the conclusion. the important actuality role of the molecular-genetic studies dealing with the gene polymorphism of the cytokine net in the ethiopathogenesis of the autoimmune disease and. the problems of the early diagnostics of the neurodegenerative disorders in the employees exposed to the neurotoxicants of different chemical nature is indicated

Young representatives of ethnic communities: Sociocultural strategies and practices

© 2015, Mediterranean Center of Social and Educational Research. All rights reserved. The article deals with the analysis of the sociocultural identity, linguistic and cultural attitudes, and intragroup solidarity of the young representatives of the Uzbek, Tajik and Azerbaijan people in the Republic of Tatarstan. Religion is considered as an ethnointegrating characteristic, determining and influencing the sociocultural strategies and practices of the diaspora youth. The results presented in the article are based upon the materials obtained by the authors during the period from April to June 2013 on the territory of the Republic of Tatarstan

The Physical Examination of infants and children

ОСМОТР ДЕТЕЙОСМОТР НОВОРОЖДЕННЫХПЕДИАТРИЯПРОПЕДЕВТИКА ДЕТСКИХ БОЛЕЗНЕЙПособие для иностранных студентов знакомит с методикой проведения осмотра новорожденных и детей