Добрый день, Коллеги. Важное сообщение, просьба принять участие. Музей Ферсмана ищет помощь для реставрационных работ в помещении. Подробности по ссылке
A typical debris flow is a torrential flow of a mixture of water, mud and debris that suddenly pushes ahead with a vanguard of huge, jostling and roaring boulders. It is certainly a very fearful phenomenon that causes disasters, but it is also truly a wonder of nature exciting the curiosity of researchers as to how such a phenomenon can arise. The phenomena themselves had been recognized since ancient times in Japan and given various mnemonic names to make people aware of the dangers. Although there were several detailed witness records around in 1965 when I began working for the Disaster Prevention Research Institute of Kyoto University (hereafter called DPRI), the characteristics and mechanisms of debris flows were still vague, and it was called a ‘phantasmal disaster’.
An essential objective of mathematics is to create settings and concepts to better understand our world. Mathematics is present in everyday life. Even more, almost all sciences undergo a process of “mathematization” due to increasing technological progress.
What is exactly that enables the mathematicians to provide the transfer from concrete measurements and observables to abstract mathematical formalisms and models? Some programmatic answers should be given at this early stage essentially inspired by the contributions in Freeden (2009, 2015), Freeden et al. (2019):
Underground Coal Gasification (UCG) is an alternative method of extracting energy from coal whereby the coal is burnt within an in situ UCG reactor. The method has been established for almost a century, but it has not been widely used despite its advantages, which include the circumvention of underground human presence and the possibility to work with low quality coal that is deep underground. One of the main difficulties associated with the implementation of UCG on an industrial scale is the prediction of surface subsidence, which is required to assess potential damage to surface infrastructure, UCG equipment, and boreholes.
Torsten Bickert Zentrum fu¨r Marine Umweltwissenschaften, Universita¨t Bremen, Germany Steven N. Carey Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island, USA Jean-Claude Fauge`res Universite´ de Bordeaux, UMR CNRS 5805 EPOC, Talence Cedex, France Rudiger Henrich Department of Sedimentology and Paleoceanography, Faculty of Geosciences, University of Bremen, klagenfurter Straße, Bremen, and Fachbereich Geowissenschaften, Universita¨t Bremen, Germany Reinhard Hesse Earth and Planetary Sciences, McGill University, Montreal, Quebec, Canada
Exceptional oblique-dip exposures of submarine fan complexes of the Brushy Canyon Fm. allow reconstruction of channel geometries and reservoir architecture from the slope to the basin floor. The Brushy Canyon conslsts of 1,500 ft. of basinally restricted sandstones and siltstones that onlap older carbonate slope deposits at the NW margin of the Delaware Basin.
The Gres d'Annot (Annot Sandstone) Formation of SE France includes some of the world's best exposures of sandy turbidites and has been the source of highly influential models of turbidite system development. This formation is now considered as a model example of a tectonically-controlled confined turbiditic ramp, and the Gres d'Annot outcrops constitute a classic area for academic and industrial field courses on deep-water gravity flow deposits. From the early 1930s, the focus of research on these extensive exposures has moved progressively from lithostratigraphy and structural interpretation to sedimentology, seismic-scale architecture of turbidite bodies, evaluation of tectonic controls, and more recently to detailed characterization of the turbidite units as hydrocarbon reservoir analogues <...>
Программа DEEPSOIL предназначена для выполнения одномерного анализа отклика грунта, с ее помощью возможно осуществление: a) одномерного нелинейного анализа во временной области с созданием порового давления и без него и b) одномерного линейного эквивалентного анализа в частотной области, включая конволюцию и деконволюцию. Программа DEEPSOIL была разработана под руководством профессора Юссефа M. A. Хашаша студентами и выпускниками Университета штата Иллинойс в Урбана-Шампейн: Дуи Парком, Чи-Чин Цаем, Камило Филлипсом, Дэвидом Р. Гроховски, Дэниелом Тернером, Майклом Масгроувом, Бюнг Мин Кимом и Джозефом Хармоном. <...>
The deformation mechanisms and controls that operate in the mylonite/ultramylonite transition are interpreted from microstructural observation. The investigated mylonites and ultramylonites were derived from a granitic protolith which was deformed under greenschist facies conditions, and in the presence of fluid, in a regional-scale shear zone from northwest Argentina. Several deformation mechanisms were recognized to operate simultaneously in different domains of the microstructure at each particular stage of the microstructural evolution. This continuously mobile deformation partitioning, present throughout the microstructural evolution, ceases abruptly in the ultramylonite stage, where a stable-state microstructure is achieved. Domainal quartz c-axis fabrics indicate that quartz deforms by crystal-plastic processes at the initial and intermediate stages of deformation, but solution-transfer processes become predominant in the ultramylonite stage. Plagio-clase is progressively transformed into muscovite through retrograde softening reactions. K-feldspar is progressively transformed into fine-grade aggregates via cataclastic flow and incipient recrystallization. Mica deforms by kinking and basal slip, with progressive development of fine-grained, morphologically oriented aggregates. Plagioclase disappearance as well as the development of intrafolial microfolds characterize the transition between the mylonitic and ultramylonitic domains. Disruption of these microfolds is interpreted to represent the ultimate control on the localization of the ultramylonite bands, с 1998 Elsevier Science Ltd. All rights reserved