Statistical properties of an ensemble of vortices interacting with a turbulent field

We develop an analytical formalism to determine the statistical properties of a system consisting of an ensemble of vortices with random position in plane interacting with a turbulent field. We calculate the generating functional by path-integral methods. The function space is the statistical ensemble composed of two parts, the first one representing the vortices influenced by the turbulence and the second one the turbulent field scattered by the randomly placed vortices.Comment: Third version; Important corrections in the normalization for the gas of vortices, et

Preliminary Biological Evaluation of Leucine Labeled with Gallium-68—A Potential Agent for Tumor Imaging

Amino acids are important nutrients for proliferating tumor cells, so their transport is generally increased in many malignant tumor cells. Radiolabeled amino acids are of great interest as they can be alternative or complement tracers to the already wellestablished radiopharmaceuticals such as 18F-FDG. The purpose of this study was to synthesize and characterize a novel 68Ga labeled leucine analog, 68Ga-leucine, as a potential imaging agent for tumors which may not be amenable to imaging by 18F-FDG PET. Biodistribution studies of 68Ga-leucine were performed in Wistar rats with transplanted cholangioma RS-1 xenografts after intravenous injection. 68Ga-leucine demonstrated high in vivo stability. Accumulation of 68Ga-leucine at xenograft tumors was about 2-4 higher as compared with 68GaCl3 and reached 0.79% ID/g. Among the soft tissue organs, only kidney had a relatively high uptake. The amount of radioactivity in other organs didn’t exceed 1% ID/g. The results suggest that 68Ga-leucine has the potential to be a new additional diagnostic tool for PET imaging of tumors. Keywords: gallium-68, leucine, radiolabeled amino acids, positron emission tomography, tumor imaging

Crystal structure and conductivity of bismuth-containing complex oxides

In the paper, a comprehensive systematic study of different classes of bismuth containing oxide compounds was carried out. The relationship between composition, temperature and concentration regions of existence of stable, specific structure and properties of solid solutions on the basis of vanadates, molybdates, niobates and bismuth was found. The general regularities of synthesis of solid solutions with different variants of solid-phase and soluble methods were determined. On this basis, the optimal conditions for obtaining single-phase materials were formulated. For the first time the temperature and concentration boundaries of the regions of homogeneity and areas of stable existence of polymorphic modifications of solid solutions were defined and/or refined. The structural parameters of the synthesized phases were determined. By the method of electrochemical impedance spectroscopy the nature and features of impedance spectra, the temperature and concentration dependences of electrical conductivity of ceramic materials based on bismuth containing complex oxides were identified

Oxygen-ionic conductors based on substituted bismuth molybdates with column-type structural fragments

The possibility of synthesizing oxygen-ionic conductors from substituted bismuth molybdates containing [Bi12O14] n 8n+ columns, MoO4 tetrahedra, and isolated Bi ions in their structure was studied. The specifics of their structure and electric conductivity were investigated. The general formula of the solid solutions can be recorded as Bi13Mo5 - x Me x O 34 - δ, where Me is the fouror five-valent d metal (Ti, Zr, V, Nb). The electric conductivity of doped bismuth molybdates considerably increased compared with that of the matrix compound. The electric conductivity reached 5.5 × 10-3 S cm-1 at 700 C and 1.8 × 10-4 S cm-1 at 350 C for the zirconium-doped compound with x = 0.4. The porosity of the ceramics was less than 5%; the thermal expansion coefficient was of the order of 14 × 10-6 K-1. Based on the set of their characteristics, these compounds are recommended as materials for membranes of electrochemical devices. © 2013 Pleiades Publishing, Ltd

Linguostylistic Peculiarities of Episode Constructing in Cinematic Prose (on Gr. Greene’s Novel “The Quiet American”)

The question of the episode as a significant structural and compositional element of cinematic text, which is characterized by a detailed representation of the point of view of a hero, is investigated. An attempt is made to reveal the specifics of the episode structure in the works of the English-speaking writer of the 20th century Graham Greene, whose literary work was closely linked with the cinema. Central episode of Greene’s novel “The Quiet American” (1955) is analyzed as a material. The novelty of the research is seen in the fact that the phenomenon of the cinematography in art prose from the point of view of linguistic style is yet of relatively small degree of scrutiny. In this regard, special attention is paid to the author’s choice of language means in order to achieve the effect of cinematography. It is also noted that for Greene, reflections of the main characters are of great importance, and visual, sonic and other details related to the activities of the human senses serve as an impetus for reflection. The article presents the experience of long-term work of the authors in the field of stylistics of fiction, in particular, deeper study of Gr. Greene’s style was conducted

The Functioning of Humorous Utterances in Modern Language (a Case-Study of Woody Allen’s Works)

The article discussed the functioning of humorous utterances in modern language. Literary (essays) and cinematic works by Woody Allen as a vivid representative of the American humorous tradition of the 20th-21st centuries served as the material for the study. The novelty of the research consists in commenting on humorous utterances using a comprehensive approach, which includes the analysis of the cognitive and cultural base of an utterance, its communicative, discursive and linguistic features. It is shown that humorous utterances cannot be considered outside the trichotomy «consciousness, communication, speech”. It is emphasized that the latter can simultaneously realize the functions of communication, information and impact. The relevance of the article is determined by the fact that this type of utterance is characterized by a special correlation between the content plane and the expression plane, since it is intended to extract a particular reaction of the reader / listener - laughter. It is shown that idiomaticity and stylistic accuracy based on the creative use of linguistic means are typical for humorous utterances, due to their functional orientation. Particular attention is paid to structural features: it is argued that modern humorous utterances can be both monomodal (verbal) and multimodal (video-verbal) by nature

Structure and electrical conductivity of cobalt-doped Bi 26Mo10O69

The existence boundaries, structures, and transport parameters of Bi 1 - x Co x [Bi12O14]Mo 5O20 ± δ and Bi[Bi12O 14]Mo5 - y Co y O20 ± δ solid solutions, which have a unique columnar structure, were studied. Electrical conductivity in these solid solutions was studied by impedance spectroscopy. © 2013 Pleiades Publishing, Ltd

Замещенные молибдаты висмута на основе Bi13Mo5O34±δ: получение и свойства

The present work is devoted to the investigation of the methods of a synthesis and properties of the one of the most interesting one-dimensional oxygen –ion conductors, the Bi13Mo5O34±δ –based complex oxides. The general compositions of these bismuth molybdates are Bi13Mo5-хMeхO34-δ, and Bi13-yMeyMo5O34-δ, with Me = Mg, Ca, Sr, Ba (IIA group) and Co, Fe, Ni (Fe triade). The samples have been synthesized using conventional ceramic technology. The powders and pellets of the bismuth molybdates were studied by X-Ray diffraction, scanning electron microscopy, laser dispersion, dilatometry, atom absorption and inductively-coupled plasma atomic emission spectrometry. Electrical conductivity has been studied using impedance spectroscopy method.Работа посвящена исследованию возможности получения, установлению специфики структуры и электропроводящих характеристик замещенных молибдатов висмута Bi13Mo5O34±δ, содержащих в структуре уникальные для твердых оксидов колонки [Bi12O14]n8n+ и проявляющих одномерную кислород-ионную проводимость. В качестве допантов были выбраны металлы IIA подгруппы (Mg, Ca, Sr, Ba) и металлы триады железа (Co, Fe, Ni). Для аттестации продуктов синтеза применялись методы рентгенофазового анализа и электронной микроскопии, проводились высокотемпературные исследования порошков и керамики сложных оксидов. Электропроводящие свойства были исследованы методом импедансной спектроскопии

BISMUTH-DOPED CALCIUM MOLYBDATE: CRYSTAL STRUCTURE AND CONDUCTIVITY

A series of bismuth-doped calcium molybdates Ca1−1.5хBixMoO4±δ (x=0–0.4) were synthesized by solid-state reaction with Bi2O3 (99.9%), MoO3 (99.5%) and CaCO3 (99.5%) and investigated using X-ray powder diffraction and impedance spectroscopy. The solid solutions exist up to x=0.222 have tetragonal unit cell (Sp.gr. I41/a)

The Precipitation of Quasicrystalline Dispersoids in Al–Mn–Mg and Al–Mn–Cu-Based Alloys

В работе исследованы закономерности влияния условий термической обработки на формирование квазикристаллической I‑фазы в сплавах системы Al–Mn, дополнительно легированных Cu и Mg. Показано, что Cu и Mg ускоряют кинетику формирования квазикристаллических дисперсоидов и позволяют повысить их плотность распределения в объеме слитков при отжиге в интервале температур 300–350 °C. Отжиг при более высоких температурах приводит к трансформации I‑фазы в кристаллическую.The current study focuses on the influence of heat treatment parameters on the precipitation of a quasicrystalline I-phase in Al–Mn-based alloys doped with Cu and Mg. It is demonstrated that Cu and Mg accelerate the I-phase precipitation kinetics and provide increased number density of dispersoids in a temperature range of 300–350 °C. Annealing at higher temperatures leads to a transformation of the I-phase into a crystalline phase with a rod-shaped morphology.Работа выполнена при финансовой поддержке Российского фонда фундаментальных исследований (проект № 20–03–00778–21).The work was supported financially by the Russian Foundation for Basic Research (project № 20–03–00778–21)