Effect of anion doping on mobility of ionic charge carriers in solid solutions based on Ba2In2O5

In the work, mobilities of oxygen and protons are determined for F --substituted solid solutions based on brownmillerite Ba 2In2O5 and their concentration dependences are analyzed. It is found that small additives of the more mobile anion (F - ions) promote an increase in oxygen mobility as a result of additional effects of repulsion of ions of different nature in the anion sublattice. Mobility of oxygen at high fluoride concentrations decreases due to the overlapping of migration paths of diffusion, as both anions, fluoride ions and oxygen ions, move via oxygen vacancies. Concentration dependences of mobility of proton carriers have a similar character, which is related to the effect of the oxygen sublattice. The anion doping method used in the work can be recommended as the general method for improvement of the transport characteristics of oxygen-ionic and protonic conductors with a perovskite-like structure. © 2013 Pleiades Publishing, Ltd

Electric properties of oxyfluorides Ba2In2O 5-0.5x F x with brownmillerite structure

Synthesis of fluoro-substituted substances based on brownmillerite Ba 2In2O5 is carried out. The width of the homogeneity region of the Ba2In2O5-0.5x F x (0 < x ≤ 0.25) solid solution was established using X-ray analysis. Measurement of temperature dependences of conductivity in atmospheres with different partial pressure of water vapor (pH2O = 3.3 and 2 Ч 103 Pa) showed an increase in conductivity at T ≤ 550 C in a humid atmosphere, which is due to appearance of proton transport. The dependence of conductivity on partial oxygen pressure (pO2 = 0.21 Ч 105 to 10-15 Pa) is studied in the temperature range of 500-1000 C; ion transport numbers are calculated. The method of polarization measurements was used to determine transport numbers of fluoride. Total conductivity is divided into ion (proton, oxygen, and fluoride ion) and electron components. Analysis of concentration dependences of conductivities showed that low concentrations of fluoride allow increasing both the total and partial conductivities (oxygen-ion and proton) and, besides, allow shifting the "order-disorder" phase transition by 100 C to the low temperature range. © 2013 Pleiades Publishing, Ltd

The lichens and allied fungi of the southern part of the Kenozersky National Park (Arkhangelsk Region, NW Russia)

The paper presents the first data on lichen diversity in the Kenozersky National Park (Arkhangelsk Region, Northwest Russia). As a result of the study, 263 species and 1 subspecies of lichens and allied fungi were found in the southern part of the national park. Seventeen lichen species are reported for the first time for Arkhangelsk Region. Biatora albidula is a new species for Northwest European Russia. Two recorded species are included in the Red Data Book of Russian Federation and 7 in the Red Data Book of Arkhangelsk Region. Pycnothelia papillaria can be recommended for inclusion to the Red Data Book of Arkhangelsk Region

What Powers the 2006 Outburst of the Symbiotic Star BF Cygni?

BF Cygni is a classical symbiotic binary. Its optical light curve occasionally shows outbursts of the Z And-type, whose nature is not well understood. During the 2006 August, BF Cyg underwent the recent outburst, and continues its active phase to the present. The aim of this contribution is to determine the fundamental parameters of the hot component in the binary during the active phase. For this purpose we used a high- and low-resolution optical spectroscopy and the multicolour UBV RCIC photometry. Our photometric monitoring revealed that a high level of the star’s brightness lasts for unusually long time of > 7 years. A sharp violet-shifted absorption component and broad emission wings in the Hα profile developed during the whole active phase. From 2009, our spectra revealed a bipolar ejection from the white dwarf (WD). Modelling the spectral energy distribution (SED) of the low-resolution spectra showed simultaneous presence of a warm (< 10 000 K) disk-like pseudophotosphere and a strong nebular component of radiation (emission measure of ~1061 cm−3). The luminosity of the hot active object was estimated to > 5−8×103 Lʘ. Such high luminosity, sustained for the time of years, can be understood as a result of an enhanced transient accretion rate throughout a large disk, leading also to formation of collimated ejection from the WD

Plantography research of feet and estimation of the quality of the life of children keen on dancing

Objective: influence of ballroom dancing, folk and contemporary dance choreography on the functional state of the foot of children and the comparison of the quality of life of dancing children and their peers. Materials and Methods: 183 children at the age of 3-16 dancing in choreographic groups of the Udmurt Republic underwent the plantographic examination of the functional state of the feet. The questioning of 83 children-ballroom dancers (main group) and 78 peers (comparison group) from the Udmurt Republic with the help of translated PedsQL questionnaire was used for determination of the life quality. Results: the following prevalence of changes of longitudinal arches among children of 3-7 years old wasdetected: 21±3 personsin ballroom dancing and 60±1 persons in contemporary choreography (

Gradient models of the axion-photon coupling

We establish an extended version of the Einstein-Maxwell-axion model by introducing into the Lagrangian cross-terms, which contain the gradient four-vector of the pseudoscalar (axion) field in convolution with the Maxwell tensor. The gradient model of the axion-photon coupling is applied to cosmology: we analyze the Bianchi-I type Universe with an initial magnetic field, electric field induced by the axion-photon interaction, cosmological constant and dark matter, which is described in terms of the pseudoscalar (axion) field. Analytical, qualitative and numerical results are presented in detail for two distinguished epochs: first, for the early Universe with magnetic field domination; second, for the stage of late-time accelerated expansion. © Springer-Verlag / Società Italiana di Fisica 2012

Novel Pr-Doped BaLaInO4 Ceramic Material with Layered Structure for Proton-Conducting Electrochemical Devices

One of the urgent tasks of applied materials science is the creation of novel high-effective materials with target properties. In the area of energy systems, there is a problem in the conversion of chemical energy to electricity without mechanical work. Hydrogen energy provides a way using electrochemical devices such as protonic ceramic fuel cells. Novel advanced proton-conducting materials with the top characteristics of target properties are strictly needed. Layered perovskites are a novel and promising class of protonic conductors. In this work, the layered perovskite BaLa0.9Pr0.1InO4 was obtained and investigated as a protonic conductor for the first time. The possibility for water intercalation and proton transport is proved. It was shown that isovalent doping Pr3+ → La3+ leads to an increase in the crystal lattice size, proton concentration and proton mobility. The proton conductivity value for doped BaLa0.9Pr0.1InO4 composition is 18 times greater than for undoped BaLaInO4 composition. Layered perovskites based on BaLaInO4 are promising materials for application in proton-conducting electrochemical devices. © 2023 by the authors.Russian Science Foundation, RSF: 22-79-10003This research was supported by the Russian Science Foundation (grant no 22-79-10003)

The Effect of Simultaneous Homo- and Heterogeneous Doping on Transport Properties of Ba2In2O5

In this article, the possibility of application of simultaneous homogeneous and heterogeneous doping has been described for the first time. The composite 0.7Ba1.95In2O4.9F0.1⋅0.3Ba2 InNbO6 has been obtained by in situ solid-state method. The scanning electron microscopy and thermogravimetry investigations have beencarried out; the electrical properties have been examined. It has been proved that simultaneous homogeneous and heterogeneous doping is a prospective method for obtaining high-conductive proton electrolytes. Keywords: brownmillerite, composite, anionic doping, fluorin

PECULIARITIES OF MORBIDITY WITH TEMPORARY DISABILITY AMONG POPULATION OF THE SAMARA REGION

Aim - to study morbidity with temporary disability among the population of the Samara region in order to characterize the health status of the working population. Materials and methods. The form of statistical reporting No. 16-VN "Information on the causes of temporary incapacity for work" for 2013-2015 for the Samara region was analyzed. Analytical, statistical and epidemiological methods of research were used. Results. The characteristic of morbidity among the working population of the Samara region in dynamics for 2013-2015 is presented. The structure of temporary incapacity for work (TIW) in cases and in days, the average duration of one case of TIW, the number of cases and days of TIW per 100 workers were calculated. Conclusion. For the period 2013-2015 there was a decrease in the number of working population by 6.4% to 1366.4 thousand people in the Samara region. There was a slight increase (3.7% in cases and 3.4% in days) in the incidence of temporary disability for all reasons, as well as due to illness (4.0% in cases and 3.8% in days), mainly for account of the urban population. The incidence with temporary disability is almost half as high in rural areas of the region compared with cities. In the structure of morbidity due to diseases, cases of respiratory diseases, musculoskeletal system and connective tissue, as well as trauma and poisoning account for more than 70% of the total pathology. The duration of one case of temporary incapacity for work in the Samara region did not change and amounted to 12.3 days for all reasons and 13.2 days due to illness