Proton configurations in the hydrogen bonds of KH2PO4 as seen by resonant x-ray diffraction

KH2PO4 (KDP) belongs to the class of hydrogen-bonded ferroelectrics, whose paraelectric to ferroelectric phase transition is driven by the ordering of the protons in the hydrogen bonds. We demonstrate that forbidden reflections of KDP, when measured at an x-ray absorption edge, are highly sensitive to the asymmetry of proton configurations. The change of average symmetry caused by the "freezing" of the protons during the phase transition is clearly evidenced. In the paraelectric phase, we identify in the resonant spectra of the forbidden reflections a contribution related to the transient proton configurations in the hydrogen bonds, which violates the high average symmetry of the sites of the resonant atoms. The analysis of the temperature dependence reveals a change of relative probabilities of the different proton configurations. They follow the Arrhenius law, and the activation energies of polar and Slater configurations are 18.6 and 7.3 meV, respectively

An Efficient Numerical Technique for Solving the Inverse Gravity Problem of Finding a Lateral Density

The main goal of our paper is to construct a technique for the gravity inversion problem of finding a variable density in a horizontal layer on the basis of gravitational data. This technique consists of two steps: extracting the gravitational field and solving the linear integral equation of the density. After discretization and approximation of integral operator, this problem is reduced to solving large systems of linear algebraic equations. To solve these systems, we proposed a memory-efficient algorithm based on the iterative method of minimal residuals. The idea of memory optimization is based on exploiting the block-Toeplitz structure of coefficients matrix. The algorithms were parallelized and implemented using the Uran and UrFU supercomputers. A model problem with synthetic gravitational data was solved

Preface of “the second symposium on Advanced Methods and Information Technologies Applications (AMITA)”

[краткое описание не найдено

The Discourse Personality of Politician Sergey Mikheyev with Regards to his Speech Behaviour

This paper presents the results of research into the linguistic personality of politician Sergey Mikheyev when viewed as a discourse personality. Special consideration has been given to the speech behaviour characteristic of a discourse personality. The paper presents the results of the cognitive-discursive and linguo-rhetorical description of a discourse personality.The relevance of this research is based on the growing interest for linguistic personality typology with regards to discourse (K. F. Sedov, V. I. Karasik, N. D. Golev, A. V. Bolotnov, et al.). A mixed type of political discourse that actualises both the personal and status factors of its formation was chosen as the object of analysis. The research focuses on semantic dominants and semantic constructs of the discourse behaviour of the Russian politician Sergey Mikheyev, as well as on the cognitive and linguo-rhetorical mechanisms of the interpretation of speech acts when viewed as elements of individual discourse behaviour. We define the linguo-rhetorical competence of the politician’s personality. The study is novel in that it identifies semantic dominants and semantic constructs found in Mikheyev’s discourse and uses an integrative approach to analysis (cognitive-discursive and linguo-rhetorical). It is proven that semantic dominants, constructs, and presuppositions manifest inventive mechanisms of individual discourse activity. We suggest defining the status of Mikheyev’s discourse personality as a mixed type of elitist linguistic personality that is pragmatically oriented. We prove that the discourse personality of Sergey Mikheyev is a prototype of a future successful politician’s linguistic personality. The paper presents the author’s original communicative competence system of S. Mikheyev’s discourse personality

Evaluation of the effect of the furazane fragment on the NH acidity of 4- and 5-picrylaminobenzofurazanes in DMF and DMSO

The products of the reactions of picryl chloride with isomeric aminobenzofurazanes in DMF and DMSO were studied by means of nonaquoeus potentiometric titration. The effect of the position of the furazane fragment in 4- and 5-picrylaminobenzofurazanes on the NH acidity is considered. The electron-acceptor properties of the furazane fragment were evaluated via inclusion of the resulting data into the pK a-σ correlation for 2,4,6-trinitrodiphenylamines. On this basis, conventional Hammett σ constants were calculated for the furazane fragment located in the immediate vicinity of the N-H center and one position distant from it. © 2005 Pleiades Publishing, Inc

The experience of positioning the university at the educational services market

The relevance of the problem under study is based on the necessity to find the most productive method of positioning a higher educational organization at the educational services market within the conditions of transfer from the centrally planned economy to a market economy and changing of the thinking format of the young generation. The purpose of the article is to develop a set of marketing actions for positioning a higher educational organization at the educational services market and its assessment. The lead method of studying this problem is modeling which provides the possibility to consider the problem as a process of results-oriented and well-informed managing of the process of development of a university as an educational system. The article contains a set of marketing actions aimed at positioning the university at the educational services market using the organization’s own internal resources and consisting of the interconnected components, such as motivational-target, content-processing and resultassessing; their specific features are described and the algorithm of implementing this set is developed. The developed and assessed system is intended for promotion of the university as a brand at the educational services market, for strengthening and reinforcing its competitive positions and increasing the university’s attractiveness for future students. The materials of the article can be useful for education specialists oriented towards marketing of educational services, for teachers who deliver a course of lectures in disciplines related to pedagogical marketing or marketing of educational services. © 2016 Dorozhkin et al

High-resolution phase based method for FMCW short range radars

The paper deals with the problem of the using phase-based methods for frequency estimation in the frequency modulated continuum waves (FMCW) short-range radars in the case of high-resolution frequency estimation requirements. The equation is considered for frequency estimation by the least-square method of approximating the phase-to-time relation of the beat signal correlation function in the case of several significant components in the signal (such as valuable and interference signal-like tones). Solution is proposed for the equations by using the parametric (or subspace) decomposition of beat signals (such as eigenvector decomposition, EV). The numerical investigation shows that the bias of the frequency estimations by the proposed solution of the mentioned equation above has statistical properties similar to the method of estimation of signal parameters via rotational invariance techniques (ESPRIT). However, the proposed method does not require the double decompositions, and frequency of each eigenvector can be estimated separately. It is also shown that in the case of the unknown number of signal components the proposed method has the higher statistical properties than for such popular technique as the multiple signal classification method (MUSIC). © 2020 American Institute of Physics Inc.. All rights reserved.The work was supported by Act 211 Government of the Russian Federation, contract N 02.A03.21.0006

Properties of the "Orgamax" osteoplastic material made of a demineralized allograft bone

We investigated properties of the “Orgamax” osteoplastic material, which was produced from a demineralized bone, in the treatment of extensive caries, in particular chronic pulpitis of the permanent teeth with unformed roots in children. The “Orgamax” osteoplastic material consists of demineralized bone chips, a collagen additive, and antibiotics. The surface morphology of the “Orgamax” osteoplastic materialis macroporous, with the maximum pore size of 250 [mu]m, whereas the surface morphology of the major component of “Orgamax”, demineralized bone chips, is microporous, with a pore size of 10-20 [mu]m. Material “Orgamax” is used in the treatment of complicated caries, particularly chronic pulpitis of permanent teeth with unformed roots in children. “Orgamax” filling a formed cavity exhibits antimicrobial properties, eliminates inflammation in the dental pulp, and, due to its osteoconductive and osteoinductive properties, undergoes gradual resorption, stimulates regeneration, and provides replacement of the defect with newly formed tissue. The dental pulp viability is completely restored, which ensures the complete formation of tooth roots with root apex closure in the long-term period

10-years of risk of cardiovascular mortality depending on traditional and psychosocial risk factors in males 25-64 years

The aim of the work was to assess the risk of cardiovascular death depending on the traditional and psychosocial risk factors in an open population of men 25-64 years old over a 10-year observation period. Material and methods. In 1996, an epidemiological screening was carried out using a standard method based on a representative sample of 1,000 citizens of the Tyumen city from 25 to 64 years old. The response was 79.5%. 10 years after screening, life status was assessed. In just 10 years of follow-up, 83 deaths from CVD were reported in the male cohort. To assess the relationship between factors and mortality from CVO, a Cox proportional risk regression model was used. Results. Relationships between mortality and 12 factors were analyzed: age, education, professional affiliation, marital status, smoking, systolic and diastolic blood pressure (MAP and DBP), body mass index (BMI), plasma total cholesterol (total cholesterol), lipoproteins cholesterol low density (LDL), high-density lipoprotein cholesterol (HDL), triglycerides (TG). When building a Cox regression model, the OR of death was statistically significantly dependent on age, blood pressure (MAP and DBP), BMI, as well as blood lipid profile (CBC, LDL and TG). Of the social factors, statistically significant influence on the risk of death was primary education, hard physical labor and marital status. Because of the multivariate analysis, the following factors turned out to be significant: age, DBP, TCH, initial education level, employment in the profession of heavy physical labor and single marital status. Conclusion Thus, men of 25-64 years of Tyumen city prognostically significant in relation to cardiovascular mortality were 6 factors: age, the magnitude of DBP and total cholesterol in plasma, as well as the initial level of education, employment in the profession of heavy physical labor and single marital status.Цель работы было оценить риск сердечно-сосудистой смерти в зависимости от традиционных и психосоциальных факторов риска в открытой популяции мужчин 25-64 лет за 10-летний период наблюдения. Материал и методы. В 1996 году был проведен эпидемиологический скрининг по стандартной методике на основе репрезентативной выборки из избирательных списков граждан города Тюмени в возрасте 25-64 лет в количестве 1000 человек. Отклик составил 79,5%. Через 10 лет после проведения скрининга был оценен жизненный статус. Всего за 10 лет наблюдения было зарегистрировано 83 смерти от ССЗ в когорте среди мужчин. Для оценки связи между факторами и смертностью от ССЗ использовали регрессионную модель пропорционального риска Кокса. Результаты. Анализировали связи между смертностью и 12 факторами: возрастом, образованием, профессиональной принадлежностью, брачным статусом, курением, систолическим и диастолическим артериальным давлением (САД и ДАД), индексом массы тела (ИМТ), содержанием в плазме крови общего холестерина (ОХС), холестерина липопротеидов низкой плотности (ЛПНП), холестерина липопротеидов высокой плотности (ЛПВП), триглицеридами (ТГ). При построении регрессионной модели Кокса ОР смерти статистически значимо зависел от возраста, артериального давления (САД и ДАД), ИМТ, а также показателей липидного спектра крови (ОХС, ЛПНП и ТГ). Из социальных факторов статистически значимо влияли на риск смерти начальное образование, тяжелый физический труд и брачный статус. В результате проведения мультмвариантного анализа значимыми оказались следующие факторы: возраст, ДАД, ОХС, начальный уровень образования, занятость в профессии тяжелого физического труда и одинокий брачный статус. Заключение. Таким образом, у мужчин 25-64 лет города Тюмени прогностически значимыми в отношении сердечно-сосудистой смертности оказались 6 факторов: возраст, величина ДАД и ОХС в плазме крови, а также начальный уровень образования, занятость в профессии тяжелого физического труда и одинокий брачный статус