Zobrazeno 1 - 10
of 722
pro vyhledávání: '"Wallis, David"'
Autor:
Ghosh, Saptarsi, Frentrup, Martin, Hinz, Alexander M., Pomeroy, James W., Field, Daniel, Wallis, David J., Kuball, Martin, Oliver, Rachel A.
Thick metamorphic buffers are perceived to be indispensable for the heteroepitaxial integration of III-V semiconductors on silicon substrates with large thermal expansion and lattice mismatches. However, III-nitride buffers in conventional GaN-on-Si
Externí odkaz:
http://arxiv.org/abs/2407.09723
To examine the microstructural evolution that occurs during transient creep, we deformed olivine aggregates to different strains that spanned the initial transient deformation. Two sets of samples with different initial grain sizes of 5 $\mu$m and 20
Externí odkaz:
http://arxiv.org/abs/2407.04982
The flow of Earth's upper mantle has long been considered to occur by slow and near-continuous creep. Such behaviour is observed in classical high-temperature deformation experiments and is a fundamental component of geodynamic models. However, the l
Externí odkaz:
http://arxiv.org/abs/2406.10092
The rheological behaviour of olivine deforming by dislocation creep controls geodynamic processes that involve steady-state flow or transient viscosity evolution. Longstanding rheological models applied to both contexts assume that dislocation creep
Externí odkaz:
http://arxiv.org/abs/2406.10076
We study the role of grain size in the rheological behaviour of calcite aggregates in the semi-brittle regime. We conduct triaxial deformation tests on three rocks, Solnhofen limestone, Carrara marble and Wombeyan marble, with average grain sizes of
Externí odkaz:
http://arxiv.org/abs/2302.01183
Publikováno v:
In Ultramicroscopy March 2024 257
Autor:
Cuenca, Jerome A., Smith, Matthew D., Field, Daniel E., Massabuau, Fabien C-P., Mandal, Soumen, Pomeroy, James, Wallis, David J., Oliver, Rachel A., Thayne, Iain, Kuball, Martin, Williams, Oliver A.
Publikováno v:
Carbon 174, 647-661 (2021)
Diamond heat-spreaders for gallium nitride (GaN) devices currently depend upon a robust wafer bonding process. Bonding-free membrane methods demonstrate potential, however, chemical vapour deposition (CVD) of diamond directly onto a III-nitride (III-
Externí odkaz:
http://arxiv.org/abs/2102.09664
Autor:
Wallis, David, Harris, Joe, Böhm, Corinna F., Wang, Di, Zavattieri, Pablo, Feldner, Patrick, Merle, Benoit, Pipich, Vitaliy, Hurle, Katrin, Leupold, Simon, Hansen, Lars N., Marin, Frédéric, Wolf, Stephan E.
Publikováno v:
Material Advances, 2022
Biomineralizing organisms are widely noted and extensively studied due to their ability to generate structures exhibiting exceptional crystallographic control. Primarily, it is the organisms, such as sea-urchins or bivalves, that generate nearly sing
Externí odkaz:
http://arxiv.org/abs/2008.05790
Changes in stress applied to mantle rocks, such as those imposed by earthquakes, induce a period of evolution in viscosity and microstructure. This transient creep is often modelled based on stress transfer among slip systems due to grain interaction
Externí odkaz:
http://arxiv.org/abs/2006.05195
Autor:
Wallis, David, Elmeros, Morten
We have developed a method of animal localisation that detects the angle from a sensor towards the direction of an animal call. The method is as simple to use as deploying a conventional static sound recorder, but provides tracking information as wel
Externí odkaz:
http://arxiv.org/abs/2001.07121