The role of the olympiad movement in forming the key competences of teachers

The role of the Olympiad movement for realization of professional, social and personal qualities of teachers is considered in the articleРассматривается роль олимпиадного движения для реализации профессиональных, социальных и личностных качеств педагого

Linear magnetoresistance due to multiple-electron scattering by low-mobility islands in an inhomogeneous conductor

Linear transverse magnetoresistance is commonly observed in many material systems including semimetals, narrow band-gap semiconductors, multi-layer graphene and topological insulators. It can originate in an inhomogeneous conductor from distortions in the current paths induced by macroscopic spatial fluctuations in the carrier mobility and it has been explained using a phenomenological semiclassical random resistor network model. However, the link between the linear magnetoresistance and the microscopic nature of the electron dynamics remains unknown. Here we demonstrate how the linear magnetoresistance arises from the stochastic behaviour of the electronic cycloidal trajectories around low-mobility islands in high-mobility inhomogeneous conductors and that this process is only weakly affected by the applied electric field strength. Also, we establish a quantitative link between the island morphology and the strength of linear magnetoresistance of relevance for future applications

High-Field Pauli-Limiting Behavior and Strongly Enhanced Upper Critical Magnetic Fields near the Transition Temperature of an Arsenic-Deficient LaO_0.9F_0.1FeAs_(1-\delta) Superconductor

We report upper critical field B_c2(T) data for disordered (arsenic-deficient) LaO_0.9F_0.1FeAs_(1-delta) in a wide temperature and magnetic field range up to 47 T. Because of the large linear slope of Bc2 about -5.4 T/K to -6.6 T/K near Tc = 28.5 K the T-dependence of the in-plane Bc2(T) shows a flattening near 23 K above 30 T which points to Pauli-limited behavior with Bc2(0) about 63-68 T. Our results are discussed in terms of disorder effects within conventional and unconventional superconducting pairings.Comment: Change of the title as suggested by the Editors, one author added, typos corrected, references updated, final published versio

NORMATIVE ORIENTATION OF THE LANGUAGE OF FICTION: LINGUISTIC-AESTHETIC ASPECT

Purpose: The article conducts the study implementation of the normative orientation of the language of fiction: linguistic-aesthetic aspect Methodology: This is analytical-logical research done by content analysis. Result: In the article, it is argued that normative orientation of the fiction speech is rather different from that of functional styles in which, as a rule, not only non-literary language elements but also specific phenomena of other styles are not used. Applications: This research can be used for the universities, teachers and education students. Novelty/Originality: A number of outstanding scientists such as V.D. Levin, N.A. Meshchersky, N.M. Shansky, N.L. Maksimov, D.N. Shmelev, K.A. Panfilov and others consider the language of fiction as a special type of the literary language which is characterized by aesthetic function and in which the particular peculiarities of all other functional styles can be found as well as non-literary linguistic means of different kinds: colloquial, slang, dialectal, etc

Cell wall components in torrefied softwood and hardwood samples

© 2015 Elsevier B.V. Torrefaction - the process of soft pyrolysis (200-300. °S(cyrillic)) in inert atmosphere - is considered to promote the usage of lignocellulosic biomass in various technologies. The initial raw material is not uniform in composition and we compared the effect of torrefaction on the samples of hardwood (birch) and softwood (pine). The major differences between the torrefied samples were observed between 225 and 250. °S(cyrillic) and were largely connected with different behavior of hemicelluloses. Monosaccharide analysis revealed the decrease in detectable xylose from 26% to 1% (250. °S(cyrillic)) of the raw sample in birch, and from 11% to 1%-in pine. Mannans were more resistant to degradation. Comparison of data from HPAEC, thermal analysis and IR-spectroscopy revealed that hemicelluloses are modified during torrefaction at 225-250. °S(cyrillic), rather than fully degraded and removed from the sample. This may lead to considerable modification of wood properties, more pronounced in hardwoods. The relative content of aromatic structures went up during torrefaction, part of the effect was due to condensation of modified carbohydrate units. Index of cellulose crystallinity increased in torrefied samples. The content of cellulose in birch samples remained the same as in raw sample up to 250. °S(cyrillic), while in pine it dramatically decreased after the torrefaction at 250. °S(cyrillic). Torrefaction at 300. °S(cyrillic) made the samples of hardwood and softwood very much alike. The perspectives of usage of hardwoods and softwoods torrefied at different temperatures are discussed

Improvement of crop rotations aimed at increasing their efficiency and conserving soil fertility in conditions of biological intensification

The long-term research conducted in 2002-2017 in a long stationary experiment on studying different types of field crop rotations under conditions of the Kirov region showed that on sod-podzolic soils the loss of humus could be lowered using agro technical methods. The most critical of them include the reduction of a portion of bare fallow, transition to sown and green-manure fallow, expanded use of perennial legume and grain-legume crops and intercrop sowings. In eight-field crop rotations when using such means of a biologization as plowing of the root-stubble residues, aboveground mass of green-manure crops in fallow fields and intercrop sowings, the supply of organic substance was within 17.24-83.03 t/ha. By mineral-ization of this substance 7.64-11.51 t of humus were produced. In a crop rotation with bare fallow there is a negative balance of humus of -0.06 t/ha. The positive balance is obtained when using sown, green-manure fallows, intercrop sowings (two-three fields), and introduction of up to 25% perennial legumes to the structure of crop rotations. The formation of 0.96-1.44 t/ha of humus in the arable layer provides positive balance of 0.20-0.72 t/ha. The increase of the part of grain crops up to 62.5-75.0% in the structure of crop rotations resulted in rise of their efficiency up to 4.74-4.79 thousand fodder units. It was 0.27-0.32 thousand fodder units higher than in the control crop rotation with bare fallow. Dependence of productivity of agricultural crops on humus content was insignificantly negative (r = -0.16). The efficiency of the studied crop rotations depended considerably on the amount of productive moisture in the soil in a phase of ear formation of grain crops (r = -0.78) and on biological activity of the soil (r = -0.80)

Ultrasonic diagnosis of renal abscess pyelonephritis in a child (case from practice)

This article describes a rare case of suppurative lesions of the kidney in the girlyounger than one year. She suffered from acute respiratory disease, and prolonged fever. In the blood and urine there were inflammatory changes. The ultrasound examination of the urinary system was carried out, which showed expansion of the right renal pelvis. According to the results of the survey the child was diagnosed with pyelonephritis and transferred to our clinic. Ultrasound exam performed in the Department of Nephrology revealed multiple focal formations of the right kidney up to 2.0 cm. When using a color Doppler to check for damage, the blood flow in them was not recorded, which indicated the inflammatory changes. The right kidney was enlarged compared to the left one, with increased echogenicity of the parenchyma. The paranephral fiber on the right kidney was thickened, heterogeneous structure contained a single liquid inclusion. Ultrasound specialists made a conclusion about there was an abscess of the right kidney - paranephritis. The child was operated. The revision of the right kidney revealed multiple abscesses; the puncture was performed of large focal masses and pus was removed from the paranephral fiber

Upper critical field measurements up to 60 T in arsenic-deficient LaO_(0.9)F_(0.1)FeAs_(1-delta): Pauli limiting behaviour at high fields vs improved superconductivity at low fields

We report resistivity and upper critical field B_c2(T) data for As deficient LaO_(0.9)F_(0.1)FeAs_(1-delta) in a wide temperature and high field range up to 60 T. These disordered samples exhibit a slightly enhanced superconducting transition at T_c = 29 K and a significantly enlarged slope dB_(c2))/dT = -5.4 T/K near T_c which contrasts with a flattening of B_(c2)(T) starting near 23 K above 30 T. This flattening is interpreted as Pauli limiting behaviour (PLB) with B_(c2)(0) approx 63 T. We compare our results with B_(c2)(T)-data reported in the literature for clean and disordered samples. Whereas clean samples show no PLB for fields below 60 to 70 T, the hitherto unexplained flattening of B_(c2)(T) for applied fields H || ab observed for several disordered closely related systems is interpreted also as a manifestation of PLB. Consequences of our results are discussed in terms of disorder effects within the frame of conventional and unconventional superconductivity.Comment: 4 pages, 3 figures, submitted to RHMF09 (9th International Conference on the Research in High Magnetic Fields), Dresden, July 22-25, 200