Reconstruction of drainage evolution in a Large Igneous Province : Intra-basaltic sedimentation in the Columbia River Basalt Province, Washington State, USA

Peer reviewe

Miocene vegetation in the Columbia River Basalt Province, Washington State, USA

Peer reviewedPublisher PD

The development of fluvial environments within volcanic terrains : the Miocene Columbia River Basalt Province (Washington State, USA) as a case study

Peer reviewedPublisher PD

Capacity of an IEEE 802.11b wireless LAN supporting VoIP

In this paper we evaluate the capacity of an IEEE 802.11b network carrying voice calls in a wide range of scenarios, including varying delay constraints, channel conditions and voice call quality requirements. We consider both G.711 and G.729 voice encoding schemes and a range of voice packet sizes. We first present an analytical..

Quantifying hurricane wind speed with undersea sound

Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 2006Hurricanes, powerful storms with wind speeds that can exceed 80 m/s, are one of the most destructive natural disasters known to man. While current satellite technology has made it possible to effectively detect and track hurricanes, expensive 'hurricanehunting' aircraft are required to accurately classify their destructive power. Here we show that passive undersea acoustic techniques may provide a promising tool for accurately quantifying the destructive power of a hurricane and so may provide a safe and inexpensive alternative to aircraft-based techniques. It is well known that the crashing of wind-driven waves generates underwater noise in the 10 Hz to 10 kHz range. Theoretical and empirical evidence are combined to show that underwater acoustic sensing techniques may be valuable for measuring the wind speed and determining the destructive power of a hurricane. This is done by first developing a model for the acoustic intensity and mutual intensity in an ocean waveguide due to a hurricane and then determining the relationship between local wind speed and underwater acoustic intensity. Acoustic measurements of the underwater noise generated by hurricane Gert are correlated with meteorological data from reconnaissance aircraft and satellites to show that underwater noise intensity between 10 and 50 Hz is approximately proportional to the cube of the local wind speed. From this it is shown that it should be feasible to accurately measure the local wind speed and quantify the destructive power of a hurricane if its eye wall passes directly over a single underwater acoustic sensor. The potential advantages and disadvantages of the proposed acoustic method are weighed against those of currently employed techniques. It has also long been known that hurricanes generate microseisms in the 0.1 to 0.6 Hz frequency range through the non-linear interaction of ocean surface waves. Here we model microseisms generated by the spatially inhomogeneous waves of a hurricane with the non-linear wave equation where a second-order acoustic field is created by first-order ocean surface wave motion. We account for the propagation of microseismic noise through range-dependent waveguide environments from the deep ocean to a receiver on land. We compare estimates based on the ocean surface wave field measured in hurricane Bonnie with seismic measurements from Florida.Finally, I am grateful to have been awarded the Office of Naval Research Graduate Traineeship Award in Ocean Acoustics. I also thank the MIT Sea Grant office for funding portions of this research

Fractional crystallization of garnet in alkali basalts at >1.8 GPa and implications for geochemical diversity of Large Igneous Provinces

Acknowledgements We thank Jussi Heinonen and an anonymous reviewer for a constructive and thoughtful criticism. We thank James Westland for pointing us at useful and interesting localities on the Isle of Mull. This study was part funded by a University of Aberdeen Elphinstone Scholarship to JHP.Peer reviewedPublisher PD

Integrated photogrammetry, lava geochemistry and palynological re-evaluation of the early evolution of the topographically constrained Mull lava field, Scotland

Open Access via the CUP Agreement The authors thank Andy Kerr, Godfrey Fitton and Rob Ellam for helpful comments and suggestions for the improvement of the original manuscript.Peer reviewe

Extra argumentality - affectees, landmarks, and voice

This article investigates sentences with additional core arguments of a special type in three languages, viz. German, English, and Mandarin. These additional arguments, called extra arguments in the article, form a crosslinguistically homogeneous class by virtue of their structural and semantic similarities, with so-called "raised possessors" forming just a sub-group among them. Structurally, extra arguments may not be the most deeply embedded arguments in a sentence. Semantically, their referents are felt to stand in a specific relation to the referent of the/a more deeply embedded argument. There are two major thematic relations that are instantiated by extra arguments, viz. affectees and landmarks. These thematic role notions are justified in the context of and partly in contrast to, Dowty's (1991) proto-role approach. An affectee combines proto-agent with proto-patient properties in eventualities that are construed as involving causation. A landmark is a ground with respect to some spatial configuration denoted by the predication at hand, but a figure at the highest level of gestalt partitioning that is relevant in a clause. Thereby, both affectees and landmarks are inherently hybrid categories. The account of extra argumentality is couched in a neo-Davidsonian event semantics in the spirit of Kratzer (1996, 2003), and voice heads are assumed to introduce affectee arguments and landmark arguments right above VP

Stratigraphy of volcanic rock successions of the North Atlantic Rifted Margin : the offshore record of the Faroe Shetland and Rockall Basins

Open Access via the CUP Read and Publish Agreement Acknowledgements The authors would like to thank Simon Kelley for comments on an earlier draft of the manuscript and for discussions on radiometric age dating. Dougal Jerram and John Faithfull are thanked for their constructive and helpful comments on the manuscript. PGS are thanked for permission to publish FSB MegaSurvey Plus data shown in Figures 6 and 8. PGS and TGS are thanked for permission to publish seismic data from the FSB2012 GeoStreamer survey also shown in Figure 6. Data used in Figure 19 are courtesy of GeoPartners and TGS, processing by DUG. IHS Kingdom Suite and Schlumberger Petrel Software are thanked for their donation of academic licenses to the University of Aberdeen.Peer reviewedPublisher PD