Hydrogen-induced rupture of strained Si─O bonds in amorphous silicon dioxide

Using ab initio modeling we demonstrate that H atoms can break strained Si─O bonds in continuous amorphous silicon dioxide (a−SiO2) networks, resulting in a new defect consisting of a threefold-coordinated Si atom with an unpaired electron facing a hydroxyl group, adding to the density of dangling bond defects, such as E′ centers. The energy barriers to form this defect from interstitial H atoms range between 0.5 and 1.3 eV. This discovery of unexpected reactivity of atomic hydrogen may have significant implications for our understanding of processes in silica glass and nanoscaled silica, e.g., in porous low-permittivity insulators, and strained variants of a−SiO2

Modulational instability of bright solitary waves in incoherently coupled nonlinear Schr\"odinger equations

We present a detailed analysis of the modulational instability (MI) of ground-state bright solitary solutions of two incoherently coupled nonlinear Schr\"odinger equations. Varying the relative strength of cross-phase and self-phase effects we show existence and origin of four branches of MI of the two-wave solitary solutions. We give a physical interpretation of our results in terms of the group velocity dispersion (GVD) induced polarization dynamics of spatial solitary waves. In particular, we show that in media with normal GVD spatial symmetry breaking changes to polarization symmetry breaking when the relative strength of the cross-phase modulation exceeds a certain threshold value. The analytical and numerical stability analyses are fully supported by an extensive series of numerical simulations of the full model.Comment: Physical Review E, July, 199

Влияние российского фондового рынка на экономический рост

The article considers the impact of the stock market on the economic growth. The aim of the study is to determine the degree of impact of the Russian stock market on gross domestic product, as well as to analyze the significance of various financial instruments in this process. The study suggests three hypotheses: 1) the dynamics of changes in the stock market as a whole has an impact on GDP growth; 2) the growth of the stock market has a positive impact on the change in GDP; 3) the stock market affects the GDP growth more, than that of corporate bonds. To test these hypotheses, the work employs methods of economic and mathematical modeling and building a vector autoregressive (VAR) model. The authors used the data from the International Monetary Fund (IMF), Moscow Exchange (MOEX) and Finam Investment Holding for the period from January 2000 to July 2019. As a result, they proved that not only traditional macroeconomic and production factors affect the country’s GDP growth, but also the positive dynamics of the stock market. The paper revealed that the impact of the growth of stock indices and corporate bonds on the change in gross domestic product would be different. At the same time, a different degree of impact of the stock market on gross domestic product over time. The authors concluded that ensuring the growth of stock indices is a condition to achieve stable growth in Russia’s GDP. Most of all, the GDP growth depends on the growth of the largest liquid companies trading in the Russian stock market.Авторы исследуют влияние фондового рынка на экономический рост. Цель исследования — определить степень влияния российского фондового рынка на валовой внутренний продукт, а также проанализировать значимость в этом процессе различных финансовых инструментов. Выдвинуты три гипотезы: 1) динамика изменения состояния фондового рынка в целом оказывает влияние на рост ВВП; 2) рост рынка акций положительно влияет на изменение ВВП; 3) на рост ВВП в большей степени влияет рынок акций, чем корпоративных облигаций. Для проверки данных гипотез использованы методы экономико-математического моделирования, построения модели векторной авторегрессии (VAR). Использованы данные Международного валютного фонда (IMF), Московской биржи (MOEX) и инвестиционного холдинга Финам за период с января 2000 по июль 2019 г. В результате исследования доказано, что на рост валового внутреннего продукта страны оказывают влияние не только традиционные макроэкономические и производственные факторы, но и положительная динамика фондового рынка. Установлено, что степень влияния роста индексов акций и корпоративных облигаций на изменение валового внутреннего продукта будет различной. При этом отмечена различная степень влияния фондового рынка на валовой внутренний продукт с течением времени. Сделан вывод, что обеспечение роста фондовых индексов является одним из условий достижения стабильного роста ВВП России. В наибольшей степени рост ВВП зависит от роста наиболее крупных ликвидных компаний, торгующих на российском фондовом рынке

A Giant Bipolar Shell around the WO star in the Galaxy IC 1613: Structure and Kinematics

Observations of the nebula associated with the WO star in the galaxy IC 1613 are presented. The observations were carried out with a scanning Interferometer Fabry-Perot in H_alpha at the 6m Special Astrophysical Observatory telescope; narrow-band H_alpha and [OIII] images were obtained with the 4-m KPNO telescope. The monochromatic H_alpha image clearly reveals a giant bipolar shell structure outside the bright nebula S3. The sizes of the southeastern and northwestern shells are 112x77 pc and (186-192)x(214-224) pc, respectively. We have studied the object's kinematics for the first time and found evidence for expansion of both shells. The expansion velocities of the southeastern and northwestern shells exceed 50 and 70 km/s, respectively. We revealed a filamentary structure of the shells and several compact features in the S3 core. A scenario is proposed for the formation of the giant bipolar structure by the stellar wind from the central WO star located at the boundary of a dense ``supercavity'' in the galaxy's H I distribution.Comment: 10 pages with 4 PS figure

The First Case of <I>Yersinia Pestis</I> Subsp. <I>Pestis</I> Isolation in the Territory of Altai Mountain Natural Plague Focus. Communication 1. Microbiological Characteristics, Molecular-Genetic and Mass-Spectrometric Identification of the Isolate

Performed is a complex microbiological, molecular-genetic and mass-spectrometric identification of Yersinia pestis main ssp. strain, which was isolated for the first time in the history of surveillance over the Altai mountain natural plague focus in June, 2012. Determined is its high universal virulence. Plasmid screening, multi-locus VNTR- and mass-spectrometric analyses have revealed the strain to be more closely related to the plague agent variant, circulating in the territory of the natural focus Khuukh-Serkh-Munkh-Khairkhan, Bayan-Ul’giisk aimak, Mongolia

Triplet p-wave superconductivity in low-density extended Hubbard model with Coulomb repulsion

We analyze superconducting instabilities in 3D and 2D extended Hubbard model with Coulomb repulsion between electrons on neighboring sites in the limit of low electron density ($n_{el} \rightarrow 0$) on simple cubic (square) lattice. We show that in a realistic strong-coupling case $U\gg V\gg W$ ($U$ and $V$ are the onsite and the intersite Coulomb repulsions, $W$ the bandwidth) the main SC instability corresponds to the p-wave pairing and in the leading order is correctly described by the equations obtained earlier in the absence of the intersite Coulomb interaction V=0.Comment: 6 pages, 4 figures, accepted for JETP Letter

Results of Immunological Screening for Natural-Focal and «Exotic» Infectious Diseases among Certain Population Groups of the Khabarovsk Territory, the Amur Region and the Jewish Autonomous Region

Displayed are the results of examination of immuno-competent local population of the Khabarovsk Territory, the Jewish Autonomous Region, the Amur Region, as well as foreign residents living and temporarily working in the areas, on a wide range of natural-focal bacterial and viral infectious diseases including the causative agents of some “exotic” infections too. Investigations have been carried out with the participation of experts from the specialized anti-epidemic team No. 1 (Irkutsk Research Anti-Plague Institute), who worked in the Amur Region, and a group of laboratory-epidemiological specialists from the team No. 2 - deployed in the Khabarovsk Territory and the Jewish Autonomous Region during the flooding in August-September 2013. The total of 1335 blood sera samples has been tested using serological methods. The findings have revealed the presence of immuno-competent population in the three regions of the Far Eastern Federal district in reference to the agents of natural-focal infectious diseases: tularemia, leptospirosis, yersinioses, hemorrhagic fever with renal syndrome, human granulocytic anaplasmosis, tick-borne borrelioses, tick-borne viral encephalitis, Californian encephalitis serogroup, Sindbis, West Nile and Dengue fevers. Circulation of Batai and Crimean-Congo hemorrhagic fever viruses has not been revealed based on serological assays

Analysis of Epidemiological Situation on Hemorrhagic Fever with Renal Syndrome in the Khabarovsk Territory and the Jewish Autonomous Region, and Prognosis of Its Development for the Past-Flood Period in 2013-2014

Complex analysis of the data concerning epidemiological situation on HFRS in the Khabarovsk Territory and the Jewish Autonomous Region for the past decade (2003-2012) previous to high water in 2013 and results of operative epidemiological inspection of the flooding area and the adjoining territory where a high index of laboratory evidences of the virus presence in the main carriers was revealed, outlines high probability of the epidemiological condition complications in view of the infection in the post-flooding period in 2013-2014 in the both entities. Therewith on the basis of the unfavorable prognosis for the epidemiological situation development a Plan of organizational, preventive and anti-epidemic measures directed to minimization of risks related to aggravation of epidemiological situation on hemorrhagic fever with renal syndrome has been developed and is being implemented