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Browsing ELibrary by Title
Now showing items 13468-13487 of 21934
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(2003)We present the results of a comprehensive numerical study of 3-D acoustic wave propagation in weakly heterogeneous random media. Finite-frequency traveltimes are measured by cross-correlation of a large suite of synthetic ...
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(2003)Nine Scots pine tree-ring-width chronologies were compared regarding growth variability and response to climate along a gradient of oceanicity–continentality at 62–64°N in central Fennoscandia. The study revealed higher ...
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(2002)A detailed description is presented of the statistical patterns of climate forcing of tree growth (annual maximum latewood density and ring-width time series), across a network of 387 specially selected conifer sites that ...
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(2002)The Late Devonian was a period of degraded reef formation that was very intense in the Middle Paleozoic. Principal reef-building organisms, such as stromatoporoids, rugoses, and tabulates of the Frasnian Stage, were replaced ...
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(2003)Graphoglyptids, a characteristic component of the Nereites ichnofacies, are patterned, mainly meander-, star-, and net-shaped trace fossils, which reveal complex burrow systems used most likely for trapping of meiobenthos ...
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(2004)Recent paleoclimatic data reveal the following trends in climate changes. (1) During three billion years, characteristic of the Earth was gradual global cooling with the increasing frequency, duration and scale of glaciations. ...
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(1999)To evaluate how the land carbon reservoir has been acting as a sink to the anthropogenic CO2 input to the atmosphere, it is important to study how plants in natural forests physiologically adjust to the changing atmospheric ...
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(1997)Archaeocyathid fauna renewals are traced in eleven regions by dividing new genera of every chron into three groups: (1) immigrant genera, or colonizers; (2) aboriginal genera; and (3) genera, whose generation areas raise ...
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(2001)A new genus and two new species of the Late Visean to Serpukhovian spiriferids from the superfamily Paeckelmanelloidea - Triangularia tumida (type species) and T. paratriangularis - are described; the description is based ...
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(2000)In siliceous deposits of eastern Russia we can recognize, by means of radiolarians, the following biostratigraphic units: Pseudostylosphaera fragilis Beds (upper Olenekian) and zones of Hosmadia gifuensis (lower Anisian), ...
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(1999)In the Khor River middle courses, the Triassic siliceous formation about 430 m thick represents the transgressive-regressive megacyclothem composed of carbonate-siliceous deposits bearing conodonts of the middle Anisian ...
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(1996)Field investigations and bed-by-bed sampling of ammonoids provide the basis for a more detailed and better constrained biostratigraphic scheme of Triassic deposits in the northern Caucasus. For the first time, these deposits ...
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(1989)The Triassic of the Timan-Northern Ural region contains analogues of the neorachitome, parotosuchid, and heptasaur faunas, the last fauna presently being not known from other parts of the USSR. However, of the three groups ...
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(2001)The analysis of transgression and regression curves for 13 facies zones of the Triassic successions in Siberia was carried out for the first time. The established ten transgressive-regressive cycles of the 1st and 2nd ...
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(2004)The aim of this paper is to describe the Triassic regional geodynamic framework of the Eastern Fore-Caucasus area from data on volcanics and related sedimentary deposits. These deposits, only known by drilling, represent ...
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(2001)The behaviour of rock deformation and its failure characteristics under loading and unloading conditions are substantially different. In this paper, triaxial unloading tests have been designed to simulate the unloading ...
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(2000)The high abundance with which tricyclic terpenoids have previously been detected in Tasmanite oil shales has led to the strong suspicion that the source of these compounds is the Tasmanites microfossil prevalent in these ...
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(2001)We start giving a brief review on the current discussion of polyamorphism. In particular, the problems of experimentally identifying amorphous–amorphous or liquid–liquid transitions are considered, which are often related ...
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(2003)The exact nature of tripuhyite remains controversial more than 100 years after the first description of the mineral. Different stoichiometries and crystal structures (rutile or tri-rutile types) have been suggested for ...
Now showing items 13468-13487 of 21934