Enantioselective Total Synthesis of (+)-Cassiol

An enantioselective total synthesis of (+)-cassiol is reported. The complex derived from Pd-2(pmdba)(3) and enantiopure t-BuPHOX ligand catalyzes enantioconvergent decarboxylative alkylation to generate the quaternary carbon stereocenter at an early stage. The overall synthetic strategy involves a convergent late-stage coupling of two fragments. The synthesis features a longest linear sequence of eight steps

Theoretical and experimental study of high-pressure synthesized B20-type compounds Mn1−x_{1-x}(Co,Rh)x_xGe

The search and exploration of new materials not found in nature is one of modern trends in pure and applied chemistry. In the present work, we report on experimental and \textit{ab initio} density-functional study of the high-pressure-synthesized series of compounds Mn$_{1-x}$(Co,Rh)$_x$Ge. These high-pressure phases remain metastable at normal conditions, therewith they preserve their inherent noncentrosymmetric B20-type structure and chiral magnetism. Of particular interest in these two isovalent systems is the comparative analysis of the effect of $3d$ (Co) and $4d$ (Rh) substitution for Mn, since the $3d$ orbitals are characterized by higher localization and electron interaction than the $4d$ orbitals. The behavior of Mn$_{1-x}$(Co,Rh)$_x$Ge systems is traced as the concentration changes in the range $0 \leq x \leq 1$. We applied a sensitive experimental and theoretical technique which allowed to refine the shape of the temperature dependencies of magnetic susceptibility $\chi(T)$ and thereby provide a new and detailed magnetic phase diagram of Mn$_{1-x}$Co$_x$Ge. It is shown that both systems exhibit a helical magnetic ordering that very strongly depends on the composition $x$. However, the phase diagram of Mn$_{1-x}$Co$_x$Ge differs from that of Mn$_{1-x}$Rh$_x$Ge in that it is characterized by coexistence of two helices in particular regions of concentrations and temperatures.Comment: 12 pages, 11 figure

Study of olivines from Omolon and Seymchan meteorites using X-ray diffraction and Mössbauer spectroscopy with a high velocity resolution

Study of olivine from Omolon and Seymchan meteorites was performed using X-ray diffraction and Mössbauer spectroscopy with a high velocity resolution. X-ray diffraction patterns were measured at room temperature while Mössbauer spectra were measured at 295 and 90 K. The orthorhombic crystal lattice parameters were evaluated for olivine from Omolon and Seymchan. These parameters appeared to be different for olivines from both meteorites. Mössbauer spectral components related to 57Fe in crystallographically non-equivalent sites M1 and M2 in both olivines were determined and its Mössbauer hyperfine parameters were evaluated. Some differences in the tendencies of temperature dependence of spectral parameters and small variations of 57Fe quadrupole splitting in both M1 and M2 sites of olivines from Omolon and Seymchan were found. On the basis of Mössbauer parameters and chemical data, the temperatures of equilibrium cation distribution were evaluated for both olivines. © 2012 American Institute of Physics

«Associative tags» as a pedagogical technique, a tool of systematization and information assimilation for a foreign language study (through the German language)

The aim of the study is to determine a meaning and methods to use associations as one of mnemonics for teaching a foreign language and to justify the need of the introduction of the specific term «associative tag». Methods. The complex of complementary research methods are used in order to achieve the set goal: theoretical (analysis and generalization of research papers); empirical (data collection and storage) and experimental methods (examination and implementation). Results and scientific novelty. The article determines a meaning and methods to use associations as one of mnemonics for teaching a foreign language. The specific term as «associative tag» is introduced and explained in terms of a pedagogical method to create a stable and permanent system of associative and semantic links and imaginations being fixed in a memory under the certain information, action or event. Practical significance. The study results may be used in direct teaching foreign languages and in theoretical courses.Цель статьи – рассмотреть сущность и способы использования ассоциаций как одного из мнемотехнических приемов обучения иностранному языку. Методы. В исследовании был применен комплекс методов: теоретических – анализа и обобщения результатов научно-методических работ; эмпирических – сбора и накопления данных; экспериментальных – наблюдения, тестирования, опыта внедрения. Результаты и научная новизна. Показана специфика использования ассоциаций как одного из мнемотехнических приемов обучения на примере освоения немецкого языка. Введен и обоснован термин «ассоциативной закладки», означающий педагогический прием по созданию устойчивого, постоянного комплекса ассоциативных и смысловых связей и представлений, закрепляемых в памяти за определенными информацией, действием или событием. Практическая значимость. Материалы статьи могут быть использованы в процессе обучения студентов иностранному языку, а также в теоретических лекционных курсах по методике преподавания иностранных языко

VIDEO BLOGGING AS AN INNOVATIVE FORM OF THE PROJECT ACTIVITY IN FOREIGN LANGUAGE TEACHING TO JOURNALISM STUDENTS

Introduction. The appearance of new formats and ways of presenting information inevitably affects the educational process and leads to the necessity to revise the paradigm of pedagogical attitudes and tools of the teaching activity, which in turn generates a number of methodological and didactic problems to be solved. The relevance of the research topic is caused by the current tendency of the distribution of video blogging as an information activity tool that affects the educational environment. There is a steady development of video blogging (a special kind of blog, where the emphasis is made on video information) as a new channel of communication in the educational services market, and using it as a separate form of non-educational project activity within the framework of mastering one or another academic discipline. In the conditions of deficiency of classroom hours and increase in student independent work, project-based education is becoming more and more demanded type of training. Currently, interdisciplinary projects are being widely disseminated at high school; these projects are aimed at vocational guidance for a foreign language, they meet the requirements of the new communication reality and the needs of modern educational systems. The aim of the publication is to consider video blogging as an innovative form of project-oriented learning a foreign language and to characterize the features of creating and implementing media content within the framework of a foreign language training course. Methodology and research methods. In the course the research, such theoretical scientific methods as analysis, synthesis, concretization, generalization, as well as hypothetical-deductive and design methods were applied. Results and scientific novelty. For the first time the article deals with the structure of video blogging as a project work and as a form of professionally oriented foreign language teaching as well, also there are formulated basic didactic questions in the article. These questions have appeared in the process of the development and the implementation of the media project “Episch! Deutsch”, created in 2015 within the framework of the subject “German language” at the Department of Media Linguistics of the Faculty of Journalism of Moscow State University named after M. V. Lomonosov. The conclusion is made that it is necessary to develop methodological criteria and educational standards that regulate video blogging as a way of teaching and methodological work, also a providing an opportunity for development of teachers’ professional qualification. Practical significance. The materials of the present publication can be useful for future and practicing teachers of a foreign language, as well as for other categories of educators engaged in organization of educational project activities.Введение. Появление принципиально новых форматов и способов трансляции информации неизбежно отражается на образователь- ном процессе и требует пересмотра установок и технологий педагогической деятельности, что, в свою очередь, порождает ряд методических и дидактических проблем, нуждающихся в решении. Актуальность представленного в статье исследования обусловлена тенденцией распространения видеоблоггинга как инструмента влияния информационной деятельности на образовательную среду и нового коммуникационного канала на рынке образовательных услуг, а также как особой формы учебной проектной деятельности в рамках освоения той или иной учебной дисциплины. Учебное проектирование в условиях дефицита академических часов и увеличения доли самостоятельной работы студентов вузов становится все более востребованным видом обучения. В частности, в настоящее время в высшей школе стали широко применяться междисциплинарные проекты, направленные на профессионально-ориентированное освоение иностранного языка и отвечающие требованиям новой коммуникационной реальности и нуждам современных образовательных систем. Цель публикации – охарактеризовать видеоблоггинг как инновационную разновидность проектного обучения иностранному языку и описать особенности создания и внедрения в учебный процесс медиаконтента. Методология и методы. В ходе исследования применялись универсальные теоретические научные методы: анализ, синтез, конкретизация и обобщение; использовались также гипотетико-дедуктивный и проектный методы. Результаты и научная новизна. Структура видеоблоггинга впервые рассмотрена с позиций учебного проектирования и профориентированного обучения иностранному языку. Обсуждаются дидактические проблемные вопросы, которые возникли у автора при разработке и апробации в рамках дисциплины «Немецкий язык» медиапроекта «Episch! Deutsch», созданного в 2015 г. на кафедре медиалингвистики факультета журналистики МГУ им. М. В. Ломоносова. Сделан вывод о том, что для эффективной организации учебного видеоблоггинга и обеспечения возможности профессионального повышения квалификации педагогов необходимы формирование четких критериев реализации данного направления учебно-методической работы и составление соответствующих методических указаний и рекомендаций. Практическая значимость. Материалы статьи могут быть полезны будущим и практикующим преподавателям иностранного языка, а также другим категориям работников сферы образования, занимающимся организацией учебной проектной деятельности

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

ASSESSMENT-BASED MANAGEMENT OF ENTERPRISE’S INTELLECTUAL CAPITAL

The effective management of the intellectual capital of the enterprise in the modern information economy opens up new opportunities to increase productivity, solve problems that previously seemed almost unsolvable, creates conditions for further development and growth of the enterprise innovative value. This provokes the scientific researches of the authors to focus on certain aspects of the effective management of modern business structures, based on intellectual capital.The effective management of the intellectual capital of the enterprise in the modern information economy opens up new opportunities to increase productivity, solve problems that previously seemed almost unsolvable, creates conditions for further development and growth of the enterprise innovative value. This provokes the scientific researches of the authors to focus on certain aspects of the effective management of modern business structures, based on intellectual capital

MSSM-inspired multifield inflation

Despite the fact that experimentally with a high degree of statistical significance only a single Standard Model--like Higgs boson is discovered at the LHC, extended Higgs sectors with multiple scalar fields not excluded by combined fits of the data are more preferable theoretically for internally consistent realistic models of particle physics. We analyze the inflationary scenarios which could be induced by the two-Higgs doublet potential of the Minimal Supersymmetric Standard Model (MSSM) where five scalar fields have nonminimal couplings to gravity. Observables following from such MSSM-inspired multifield inflation are calculated and a number of consistent inflationary scenarios are constructed. Cosmological evolution with different initial conditions for the multifield system leads to consequences fully compatible with observational data on the spectral index and the tensor-to-scalar ratio. It is demonstrated that the strong coupling approximation is precise enough to describe such inflationary scenarios.Comment: 27 pages, 4 figures, 5 tables. Version to appear in JHEP. Additions made to the text of the Introduction dealing with the issues of conformity of this multifield model and models of N=1 supergravity (pages 2-3). Added new inflationary scenarios, which are an artifact of such analysis (pages 11-12, Tables 1-4). Additional comments on page 9 and page 13. New references adde

Preparation and characterization of Bi26–2xMn2xMo10O69-d and Bi26.4Mn0.6Mo10–2yMe2yO69-d(Me = V, Fe) solid solutions

Received: 06.06.2017; accepted: 23.06.2017; published: 14.07.2017.Single phase samples of bismuth molybdate, Bi26Mo10O69, doped with Mn on the bismuth sublattice and V, Fe on the molybdenum sublattice were found to crystallize in the triclinic Bi26Mo10O69 structure at low doping levels and in the monoclinic Bi26Mo10O69 structure - at higher dopant concentration. The assumption that all Mn ions have an oxidation state of +2 was confirmed by means of magnetic measurement results analysis using Curie-Weiss law. Conductivity was investigated using impedance spectroscopy. The conductivity of Bi26.4Mn0.6Mo9.6Fe0.4O69-d was 1.2*10-2 S*cm-1 at 973 K and 2.2*10-4 S*cm-1 at 623 K, and the conductivity of Bi26.4Mn0.6Mo9.2V0.8O69-d was 2.2*10-3 S*cm-1 at 973 K and 2.2*10-5 S*cm-1 at 623 K