1,615 research outputs found
Tadcaster Magnesian Limestone 3-D borehole interpretation and cross-sections study
This report was prepared under contract to the Environment Agency and describes the geology
of the area surrounding Tadcaster in North Yorkshire. The work was commissioned to
investigate the local geology and construct 3-D cross-sections from borehole and surface
information. Approximately 1200 boreholes were utilised for the work and these ranged in depth
from a few metres to 350m. Five cross-sections were constructed; three WSW-ENE trending
sections and two NNW-SSE trending sections all to a depth of 250m below OD.
In addition, a series of thematic maps were generated from the lithological component of the
digital borehole data. Total superficial aquifer and superficial aquitard maps show how the
lithological nature of the superficial sequence varies across the area. Rockhead elevation and
superficial thickness maps indicate where the bedrock aquifers outcrop or are near to the ground
surface.
The east side of the Vale of York in the vicinity of Tadcaster is underlain by a sequence of
Permian and Triassic rocks overlain in part by thick superficial deposits dating mainly from the
last Ice-Age. The Permian rocks comprise two magnesian limestone aquifers separated by
sequences of gypsum/anhydrite and gypsiferous mudstones. The overlying Triassic rocks
comprise the major Sherwood Sandstone aquifer. The western part of the area consists of mainly
exposed bedrock (Permian dolostone and dolomitic limestone), but the eastern side where the
Sherwood Sandstone Group is present has a thick cover of superficial deposits including
moraines, glacial lake deposits and alluvial deposits
Determination of Li-6 -- He-4 interaction from multi-energy scattering data
We present the first successful potential model description of Li-6 -- He-4
scattering. The differential cross-sections for three energies and the vector
analyzing powers for two energies were fitted by a single potential with energy
dependent imaginary components. An essential ingredient is a set of Majorana
terms in each component. The potential was determined using a recently
developed direct data-to-potential inversion method which is a generalisation
of the IP S-matrix-to-potential inversion algorithm. We discuss the problems
related to this phenomenological approach, and discuss the relationship of our
results to existing and future theories.Comment: 9 pages plain LaTeX, 6 postscript figue
Magnetic field dependence of the temperature derivative of resistivity: a probe for distinguishing the effects of pseudogap and superconducting fluctuations in cuprates
We have studied the magnetic field dependence of the temperature derivative
of the resistivity, dr(H,T)/dT, of a number of Y1-xCaxBa2(Cu1-yZny)3O7-d
crystalline thin films over a wide range of sample compositions. From the
analysis of the temperature derivative data we have been able to distinguish
quite clearly between two characteristic temperature scales, (a) the onset of
strong superconducting fluctuation temperature, Tscf and (b) the pseudogap
temperature, TPG. Significantly different characteristic features of dr(H,T)/dT
at Tscf and at TPG imply that Tscf and TPG have different physical origins.Comment: Submitted to Physica C (M2S-HTSC 2006 Proceedings
Deuteron -- interaction by inversion of RGM S-matrix: determination of spin-orbit potential for spin-1 projectile
The iterative-perturbative (IP) procedure for S-matrix to potential inversion
is applied to spin-one projectiles for the restricted case of vector spin-orbit
interaction only. In order to evaluate this extension of IP inversion we have
inverted the multi-channel RGM of Kanada et al for deuterons
scattering from He with deuteron distortion and then compared the central
components with those derived from RGM with spin set to zero. Attention is
given to the question of how well the resulting potentials are established.
Reliable spin-1 inversion is demonstrated. Results relating to inversion, to
deuteron-nucleus interactions and to RGM are presented and suggest the range of
nuclear interaction information which the procedure makes possible. Unusual
non-locality and parity dependence effects are found; these are of possible
relevance to generic properties of nuclear potentials.Comment: 15 pages LaTeX plus 6 postscript figure
Disciplined Improvisation:Characteristics of inquiry in mindfulness-based teaching
Evidence for the effectiveness of mindfulness-based stress reduction (MBSR) and mindfulness-based cognitive therapy (MBCT) is rapidly growing as interest in this field expands. By contrast, there are few empirical analyses of the pedagogy of MBSR and MBCT. Development of the evidence base concerning the teaching of MBCT or MBSR would support the integrity of the approach in the context of rapid expansion. This paper describes an applied conversation analysis (CA) of the characteristics of inquiry in the MBSR and MBCT teaching process. Audio-recordings of three 8-week MBCT and MBSR classes, with 24, 12, and 6 participants, were transcribed and systematically examined. The study focused on the teacher-led interactive inquiry which takes place in each session after a guided meditation practice. The study describes and analyzes three practices within the inquiry process that can be identified in sequences of talk: turn-taking talk involving questions and reformulations; the development of participant skills in a particular way of describing experience; and talk that constructs intersubjective connection and affiliation within the group. CA enables fine-grained analysis of the interactional work of mindfulness-based inquiry. Inquiry is a process of disciplined improvisation which is both highly specific to the conditions of the moment it took place in and uses repeated and recognizable patterns of interaction
Magneto-Transport Properties of Doped RuSrGdCuO
RuSrGdCuO, in which magnetic order and superconductivity coexist
with , is a complex material which poses new and
important questions to our understanding of the interplay between magnetic and
superconducting (SC) order. Resistivity, Hall effect and thermopower
measurements on sintered ceramic RuSrGdCuO are presented, together
with results on a broad range of substituted analogues. The Hall effect and
thermopower both show anomalous decreases below which may be
explained within a simple two-band model by a transition from localized to more
itinerant behavior in the RuO layer at .Comment: 10 pages, 7 figures, submitted to Phys. Rev. B., correspondence to
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BECOOL: Ballooning eigensolver with COOL finite elements
An incompressible variational ideal ballooning mode equation is discretized with the COOL finite element discretization scheme using basis functions composed of variable order Legendre polynomials. This reduces the second order ordinary differential equation to a special block pentadiagonal matrix equation that is solved using an inverse vector iteration method. A benchmark test of BECOOL (Ballooning Eigensolver using COOL finite elements) with second order Legendre polynomials recovers precisely the eigenvalues computed by the VVBAL shooting code. Timing runs reveal the need to determine an optimal lower order case. Eigenvalue convergence runs show that cubic Legendre polynomials construct the optimal ballooning mode equation for intensive computations
Superficial geology and hydrogeological domains between Durham and Darlington. Phase 2, (Durham North)
The North East Region’s Groundwater Modelling Strategy has identified the need for the
development of a conceptual model for the Magnesian Limestone aquifer. In line with the
Environment Agency R&D Technical Report W214 (Environment Agency Framework for
Groundwater Resources Conceptual and Numerical Modelling), a scoping study was produced,
that identified areas of uncertainty and work required for the development of the conceptual
model.
The purpose of this project is to give the Environment Agency (EA) a regional understanding of
the geology and hydrogeology of the Magnesian Limestone and overlying superficial deposits in
the North East Region, using information held by the British Geological Survey (BGS). This
report contributes to the conceptual model and understanding of the Magnesian Limestone
aquifer.
There is uncertainty in the amount of recharge that the Magnesian Limestone receives from
rainfall. The project is designed to gain a greater understanding of the geology of the superficial
deposits and their hydrogeological properties. These are the key factors for the calculation of
recharge to the Magnesian Limestone aquifer from rainfall. This element of the conceptual
model is essential in understanding the potential water resource available within this aquifer
Uncertainty in mapped geological boundaries held by a national geological survey: eliciting the geologists' tacit error model
It is generally accepted that geological line work, such as mapped boundaries, are uncertain for various reasons. It is difficult to quantify this uncertainty directly, because the investigation of error in a boundary at a single location may be costly and time consuming, and many such observations are needed to estimate an uncertainty model with confidence. However, it is recognized across many disciplines that experts generally have a tacit model of the uncertainty of information that they produce (interpretations, diagnoses, etc.) and formal methods exist to extract this model in usable form by elicitation. In this paper we report a trial in which uncertainty models for geological boundaries mapped by geologists of the British Geological Survey (BGS) in six geological scenarios were elicited from a group of five experienced BGS geologists. In five cases a consensus distribution was obtained, which reflected both the initial individually elicited distribution and a structured process of group discussion in which individuals revised their opinions. In a sixth case a consensus was not reached. This concerned a boundary between superficial deposits where the geometry of the contact is hard to visualize. The trial showed that the geologists' tacit model of uncertainty in mapped boundaries reflects factors in addition to the cartographic error usually treated by buffering line work or in written guidance on its application. It suggests that further application of elicitation, to scenarios at an appropriate level of generalization, could be useful to provide working error models for the application and interpretation of line work
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