151 research outputs found
In-situ stress conditions at Nankai Trough, Site 808
Shipboard laboratory index property data, shore-based consolidation tests, and in-situ stress and pore-pressure measurements are used in this study to constrain the stress conditions at ODP Site 808, Nankai Trough. Results of these tests are presented along
with additional intepretations of porosity rebound and permeability. The sediment at Site 808 is highly affected by excess fluid
pressures throughout the sediment column. Excess fluid pressure is severe below the major fault boundary, the decollement. The
in-situ measurement of lateral stresses, which are shallow in the sediment section, confirms that the principal stress direction is
rotated from a "normal" basin-type condition where the principal stress direction is vertical
Cerebral differences in explicit and implicit emotional processing - An fMRI study
The processing of emotional facial expression is a major part of social communication and understanding. In addition to explicit processing, facial expressions are also processed rapidly and automatically in the absence of explicit awareness. We investigated 12 healthy subjects by presenting them with an implicit and explicit emotional paradigm. The subjects reacted significantly faster in implicit than in explicit trials but did not differ in their error ratio. For the implicit condition increased signals were observed in particular in the thalami, the hippocampi, the frontal inferior gyri and the right middle temporal region. The analysis of the explicit condition showed increased blood-oxygen-level-dependent signals especially in the caudate nucleus, the cingulum and the right prefrontal cortex. The direct comparison of these 2 different processes revealed increased activity for explicit trials in the inferior, superior and middle frontal gyri, the middle cingulum and left parietal regions. Additional signal increases were detected in occipital regions, the cerebellum, and the right angular and lingual gyrus. Our data partially confirm the hypothesis of different neural substrates for the processing of implicit and explicit emotional stimuli. Copyright (c) 2007 S. Karger AG, Basel
Julian of Norwich and her children today: Editions, translations and versions of her revelations
The viability of such concepts as "authorial intention," "the original text," "critical edition" and, above all, "scholarly editorial objectivity" is not what it was, and a study of the textual progeny of the revelations of Julian of Norwich--editions, versions, translations and selections--does little to rehabilitate them. Rather it tends to support the view that a history of reading is indeed a history of misreading or, more positively, that texts can have an organic life of their own that allows them to reproduce and evolve quite independently of their author. Julian's texts have had a more robustly continuous life than those of any other Middle English mystic. Their history--in manuscript and print, in editions more or less approximating Middle English and in translations more or less approaching Modern English--is virtually unbroken since the fifteenth century. But on this perilous journey, many and strange are the clutches into which she and her textual progeny have fallen
Evaluation of hydrogeologic properties of the Barbados accretionary prism: a synthesis of Leg 156 results
In situ and laboratory studies of permeability, conducted by Ocean Drilling Program scientists from Leg 156, provide constraints
on parameters controlling the hydrogeologic system in the Barbados accretionary prism. Results from these studies
indicate that core-scale and formation-scale permeability values differ by at least several orders of magnitude and are dependent
on pore-fluid pressure and effective stress conditions. Direct measurement from packer experiments and indirect evidence
from consolidation tests suggest that pore-fluid pressures are commonly above hydrostatic values and approach lithostatic values
within the décollement zone. Permeability and fluid pressure conditions in the Barbados accretionary prism reflect the complexity
of the hydrogeologic system of such an active tectonic environment
Report and preliminary results of SONNE cruise SO175, Miami - Bremerhaven, 12.11 - 30.12.2003 : (GAP, Gibraltar Arc Processes)
Expedition SO175 using FS Sonne aimed for a multidisciplinerary geoscientific approach with an international group of researchers. Methods covered the entire span from geophysical data acquisition (seafloor mapping, echography, seismic reflection), sediment coring at sites of active fluid venting, in situ heat flow measurements across the entire length of the Gibraltar thrust wedge, the deformation front, landslide bodies, and mud volcanoes, and finally the deployment of a long-term pore pressure probe. Video-supported operations helped to identify fluid vent sites, regions with tectonic activity, and other attractive high priority targets. Qualitative and quantitative examinations took place on board and are continued on land with respect to pore pressure variation, geomicrobiology, sediment- and fluid mobilization, geochemical processes, faunal assemblages (e.g. cold water corals), and gas hydrates (flammable methane-ice-crystals). Main focus of the expedition has been a better understanding of interaction between dynamic processes in a seismically active region region with slow plate convergence.
In the context of earthquake nucleation and subduction zone processes, the SO175 research programme had a variety of goals, such as:
• To test the frictional behaviour of the abyssal plain sediments.
• To explore the temperature field of the 1755 thrust earthquake event via heat flow measurements.
• To assess the role of fluid venting and gas hydrate processes control slope stability and mud volcanic activity along the Iberian continental margin.
• To measure isotope geochemistry of pore waters and carbonates of deep fluids.
• To quantify microbial activity in Gibraltar wedge sediments.
• To test whether microseismicity in the area corresponds to in situ pore pressure changes.
• To find out if enhanced heat flow max be indicative of active subduction.
Initial tentative results during the cruise suggest that there is a component of active thrusting at the base of the wedge, as attested by heat flow data. Based on mostly geochemical evidence, mud volcanism was found less active than previously assumed. Highlights from post-cruise research include the successful deployment of the long-term station and high frictional resistance of all incoming sediment on the three abyssal plains
Observation of strong final-state effects in pi+ production in pp collisions at 400 MeV
Differential cross sections of the reactions and have been measured at MeV by detecting the charged
ejectiles in the angular range . The
deduced total cross sections agree well with those published previously for
neighbouring energies. The invariant mass spectra are observed to be strongly
affected by production and final-state interaction. The data are
well described by Monte Carlo simulations including both these effects. The
ratio of and cross sections also compares
favourably to a recent theoretical prediction which suggests a dominance of
-production in the relative -state.Comment: 17 pages, 5 figure
Rationality in Differential Algebraic Geometry
Parametric Cartan theory of exterior differential systems, and explicit
cohomology of projective manifolds reveal united rationality features of
differential algebraic geometry.Comment: Abel Symposium 201
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