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Journal articleSgobba S, Stafford PJ, Marano GC, 2011, , COMPUTATIONAL METHODS IN STOCHASTIC DYNAMICS, Vol: 22, Pages: 229-246
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- Citations: 4
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Journal articleFang F, Pain CC, Navon IM, et al., 2011, , International Journal for Numerical Methods in Fluids, Vol: In review
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Journal articleSookhak Lari K, van Reeuwijk M, Maksimovic C, 2011,
Combined bulk and wall reactions in turbulent pipe flow: decay coefficients and concentration profiles
, J HYDROINF, Vol: 13, Pages: 324-333 -
Journal articleKumar M, Castro JM, Stafford PJ, et al., 2011, , Earthquake Engineering & Structural Dynamics, Vol: 3, Pages: 237-276
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Journal articleMitchell AJ, Allison PA, Gorman GJ, et al., 2011, , Geology, Vol: 39, Pages: 207-210, ISSN: 0091-7613
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Journal articleKontoe S, Zdravkovic L, Potts DM, et al., 2011, , Geotechnique, Vol: 61, Pages: 815-829, ISSN: 0016-8505
This paper compares simple constitutive models that are widely used in engineering practice with more sophisticated methods in the context of a case study. In particular, four constitutive modelling approaches have been considered: a simple elasto-plastic constitutive model (modified Cam-clay), with and without Rayleigh damping; the same model coupled with a cyclic non-linear model that can simulate pre-yield hysteresis; and finally an advanced kinematic hardening model, which is an improved version of the Al-Tabbaa & Wood two-surface model. These four approaches are used to analyse the seismic response of a section of the Bolu tunnels during the 1999 Duzce earthquake. To shed light on the performance of the constitutive models, simple site response finite-element analyses were first undertaken for the studied site, paying particular attention to the calibration of the Rayleigh damping parameters. The results of these analyses, in terms of maximum shear strain, were then used as input to an analytical elastic method (extended Hoeg method) for calculating the thrust and bending moment acting in the tunnel lining. Finally the results of dynamic time domain plane-strain analyses, employing the four adopted constitutive modelling approaches, are compared against field observations and results obtained by the extended Hoeg method, to investigate the ability of the models, of ranging complexity, to mimic soil response under seismic excitation.
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Journal articleHaselwimmer CE, Riley TR, Liu JG, 2011, , INTERNATIONAL JOURNAL OF REMOTE SENSING, Vol: 32, Pages: 2013-2035, ISSN: 0143-1161
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- Citations: 26
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Journal articleFarrell PE, Piggott MD, Gorman GJ, et al., 2011, , Geoscientific Model Development, Vol: 4, Pages: 435-449
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Journal articleBishop CA, Liu JG, Mason PJ, 2011, , INTERNATIONAL JOURNAL OF REMOTE SENSING, Vol: 32, Pages: 2409-2426, ISSN: 0143-1161
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- Citations: 146
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Journal articleFoulser-Piggot R, Stafford PJ, 2011, , Earthquake Engineering & Structural Dynamics
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Journal articleSgobba S, Stafford PJ, Marano GC, et al., 2011,
An evolutionary stochastic ground-motion model defined by a seismological scenario and local site conditions
, Soil Dynamics and Earthquake Engineering -
Journal articleMorgan JV, Warner MR, Collins GS, et al., 2011, , Journal of Geophysical Research, Vol: 116
Peak rings are a feature of large impact craters on the terrestrial planets and are generally believed to be formed from deeply buried rocks that are uplifted during crater formation. The precise lithology and kinematics of peak ring formation, however, remains unclear. Previous work has revealed a suite of bright inward-dipping reflectors beneath the peak ring at the Chicxulub impact crater and that the peak ring was formed from rocks with a relatively low seismic velocity. New 2D full-waveform tomographic velocity images show that the uppermost lithology of the peak ring is formed from a thin (~100-200 m thick) layer of low-velocity (~3000-3200 m/s) rocks. This low-velocity layer is most likely to be composed of highly porous, allogenic impact breccias. Our models also show that the change in velocity between lithologies within and outside the peak ring is more abrupt than previously realized and occurs close to the location of the dipping reflectors. Across the peak ring, velocity appears to correlate well with predicted shock pressures from a dynamic model of crater formation, where the rocks that form the peak ring originate from uplifted basement that has been subjected to high shock pressures (10-50 GPa), and lie above downthrown sedimentary rocks that have been subjected to shock pressures of < 5 GPa. These observations suggest that low-velocities within the peak ring may be related to shock effects and that the dipping reflectors underneath the peak ring might represent the boundary between highly-shocked basement and weakly-shocked sediments.
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Journal articleGowen RA, Smith A, Fortes AD, et al., 2011, , ADV SPACE RES, Vol: 48, Pages: 725-742, ISSN: 0273-1177
We present the scientific case for inclusion of penetrators into the Europan surface, and the candidate instruments which could significantly enhance the scientific return of the joint ESA/NASA Europa-Jupiter System Mission (EJSM). Moreover, a surface element would provide an exciting and inspirational mission highlight which would encourage public and political support for the mission.Whilst many of the EJSM science goals can be achieved from the proposed orbital platform, only surface elements can provide key exploration capabilities including direct chemical sampling and associated astrobiological material detection, and sensitive habitability determination. A targeted landing site of upwelled material could provide access to potential biological material originating from deep beneath the ice.Penetrators can also enable more capable geophysical investigations of Europa (and Ganymede) interior body structures, mineralogy, mechanical, magnetic, electrical and thermal properties. They would provide ground truth, not just for the orbital observations of Europa, but could also improve confidence of interpretation of observations of the other Jovian moons. Additionally, penetrators on both Europa and Ganymede, would allow valuable comparison of these worlds, and gather significant information relevant to future landed missions. The advocated low mass penetrators also offer a comparatively low cost method of achieving these important science goals.A payload of two penetrators is proposed to provide redundancy, and improve scientific return, including enhanced networked seismometer performance and diversity of sampled regions.We also describe the associated candidate instruments, penetrator system architecture, and technical challenges for such penetrators, and include their current status and future development plans.
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Journal articleMaddison JR, Marshall DP, Pain CC, et al., 2011, , OCEAN MODELLING, Vol: 39, Pages: 248-261, ISSN: 1463-5003
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- Citations: 12
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Journal articleWhitchurch AL, Carter A, Sinclair HD, et al., 2011, , AMERICAN JOURNAL OF SCIENCE, Vol: 311, Pages: 442-482
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Journal articleFunke SW, Pain CC, Kramer SC, et al., 2011,
A wetting and drying algorithm with a combined pressure/free-surface formulation for non-hydrostatic models
, Advances in Water Resources -
Conference papervan Reeuwijk M, Hunt GR, Jonker HJJ, 2011,
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Journal articleVinogradov J, 2011, , Geophysical Research Letters
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Conference paperWu M-C, Liu JG, 2011, , IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Publisher: IEEE, Pages: 1183-1186, ISSN: 2153-6996
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- Citations: 1
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Journal articleBell RE, McNeill LM, Henstock T, et al., 2011,
Comparing extension on multiple time and depth scales in the Corinth Rift, Central Greece
, Geophysical Journal International, Vol: 186, Pages: 463-470
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