Use of drones to analyse sedimentary successions exposed in the foreshore     

Julie E.G. Harrald  Angela L. Coe  Rick M. Thomas  Murray Hoggett 《Proceedings of the Geologists' Association. Geologists' Association》2021,132(3):253-268

Drones have revolutionised the gathering of geoenvironmental data over the last decade. To date, the majority of drone studies of sedimentary rock successions have focussed on well-exposed vertical to subvertical cliff sections. Here, we describe a fundamental method to obtain new data and perspectives on sedimentary successions exposed in partially-obscured foreshore or other horizontal to subhorizontal outcrop surfaces using drones. We illustrate the technique using an example from foreshore exposures of Jurassic strata near Helmsdale, Scotland, UK. Our method aims to make the process of safely collecting drone footage accessible and covers practical considerations from pre-field preparation to data processing. Capturing drone imagery in a foreshore setting involves trade-offs between the time of day which constrains the lighting, the time of year which determines algal cover and tidal range, and the flight time available which indirectly governs image resolution. We show how: (1) orthomosaic images can be used to view sedimentary deposits at different scales and angles enabling identification of large-scale sedimentary features marked by small-scale changes in orientation and lateral variability; (2) production of digital elevation models permits differentially weathered features covered by water or algae to be distinguished, and (3) drones can be used for close up photography of inaccessible features.  相似文献   

Emulating The Celtic Tiger? A Comparison of the Software Industries of Singapore and Ireland     

Neil M. Coe 《Singapore journal of tropical geography》1999,20(1):36-55

This article explores parallels between the economic development strategies of Ireland and Singapore through a study of the software sector. My central argument is that Singapore's embryonic software industry can learn important lessons from Ireland, which now exports over US$6 billion worth of products annually. Ireland's success has been achieved by attracting two forms of export-oriented foreign direct investment that are increasingly important due to globalisation trends in the software industry: software development centres, and software product manufacturing and localisation (translation and local adaptation) plants. Ireland has benefited from its position on the periphery of Western Europe, one of the largest software markets in the world, to emerge as a key production location for US transnational corporations. Singapore is perhaps now poised, with a similar range of financial, labour market and infrastructural attributes as Ireland, to benefit from rapid growth in the Asia-Pacific software market. Three corporate case studies from Singapore are used to illustrate this argument.  相似文献   

Rheomorphic ignimbrites of the Rogerson Formation,central Snake River plain,USA: record of mid-Miocene rhyolitic explosive eruptions and associated crustal subsidence along the Yellowstone hotspot track     

Thomas R. Knott  Marc K. Reichow  Michael J. Branney  David R. Finn  Robert S. Coe  Michael Storey  Bill Bonnichsen 《Bulletin of Volcanology》2016,78(4):23

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A simplified 3-D human body–seat interaction model and its applications to the vibration isolation design of high-speed marine craft     

T.E. Coe  J.T. Xing  R.A. Shenoi  D. Taunton 《Ocean Engineering》2009,36(9-10):732-746

High-speed boats experience a harsh vibration environment and human response to this environment is of increasing interest to naval architects who wish to mitigate the effects of vibration and shocks. Based on published experiment data, a three-dimensional human body model with one degree-of-freedom in each direction is established. This model is combined with a simple seat model to construct a simplified 3-D human body–seat interaction model for naval architects to investigate the integrated interaction system when subjected to ship motions. The governing equations describing the dynamics of the human body–seat interactions are formulated and their theoretical solutions are derived. This model, in association with the experimental data recorded on board a high-speed marine craft, is used to study seat isolation system designs. The spring coefficient of the seat isolation system is chosen to avoid any resonance of the human–seat interaction system excited by sea waves. The damping coefficient of the seat isolation system is determined to attenuate motions at the most common excitation frequencies. The designed system is further checked by considering its response to an individual slam impact where the designed system is compared with typical existing seats to illustrate the potential advantages of the proposed approach. In addition the designed seat is compared with existing seats excited by actual boat loads. The study provides a simplified, effective approach for high-speed craft seat design in reducing the shock and vibration level experienced by the crew.  相似文献   

Clockwise rotations recorded in Early Cretaceous rocks of South Korea: implications for tectonic affinity between the Korean Peninsula and North China   总被引：12，自引：0，他引：12  

Xixi Zhao  Robert S. Coe  Ki-Hong Chang  Soon-Ok Park  Sheraz K. Omarzai  Rixiang Zhu  Yaoxiu Zhou  Stuart Gilder  & Zhong Zheng 《Geophysical Journal International》1999,139(2):447-463

Recent interest has focused on whether South Korea may have undergone variable tectonic rotations since the Cretaceous. In an effort to contribute to the answer to this question, we have completed a palaeomagnetic reconnaissance study of Early Cretaceous sedimentary and igneous rocks from the Kyongsang basin in southeast Korea. Stepwise thermal demagnetization isolated well-defined characteristic magnetization in all samples. The palaeomagnetic directions reveal patterns of increasing amounts of clockwise (CW) rotation with increasing age for Aptian rock units. Palaeomagnetic declinations indicate clockwise vertical-axis rotations of R = 34.3° ± 6.9° for the early Aptian rock unit, R = 24.9° ± 10.6° for the middle Aptian, and R = −0.9° ± 11.8° for the late Aptian relative to eastern Asia. The new Cretaceous palaeomagnetic data from this study are consistent with the hypothesis that Korea and other major parts of eastern Asia occupied the same relative positions in terms of palaeolatitudes in the Cretaceous. An analysis of and comparison with previously reported palaeomagnetic data corroborates this hypothesis and suggests that much of Korea may have been connected to the North China Block since the early Palaeozoic. A plausible cause of the rotation is the westward subduction of the Kula plate underneath the Asian continent, which is inferred to have occurred during the Cretaceous according to several geological and tectonic analyses.  相似文献   

The Weybourne Atmospheric Observatory     

S. A. Penkett  J. M. C. Plane  F. J. Comes  K. C. Clemitshaw  H. Coe 《Journal of Atmospheric Chemistry》1999,33(2):107-110

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Observations of the Nitrate Radical in the Marine Boundary Layer   总被引：3，自引：0，他引：3  

B. J. Allan  N. Carslaw  H. Coe  R. A. Burgess  J. M. C. Plane 《Journal of Atmospheric Chemistry》1999,33(2):129-154

A study of the nitrate radical (NO3) has been conducted through a series of campaigns held at the Weybourne Atmospheric Observatory, located on the coast of north Norfolk, England. The NO3 concentration was measured in the lower boundary layer by the technique of differential optical absorption spectroscopy (DOAS). Although the set of observations is limited, seasonal patterns are apparent. In winter, the NO3 concentration in semi-polluted continental air masses was found to be of the order of 10 ppt, with an average turnover lifetime of 2.4 minutes. During summer in clean northerly air flows, the concentration was about 6 ppt with a lifetime of 7.2 minutes. The major loss mechanisms for the radical were investigated in some detail by employing a chemical box model, constrained by a suite of ancillary measurements. The model indicates that during the semi-polluted conditions experienced in winter, the major loss of NO3 occurred indirectly through reactions of N2O5, either in the gas-phase with H2O, or through uptake on aerosols. The most important direct loss was via reactions of NO3 with a number of unsaturated nonmethane hydrocarbons. The cleaner air masses observed during the summer were of marine origin and contained elevated concentrations of dimethyl sulfide (DMS), which provided the major loss route for NO3. The box model was then used to investigate the conditions in the remote marine boundary layer under which DMS will be oxidised more rapidly at night (by NO3) than during the day (by OH). This should occur if the concentration of NO2 is more than about 60% that of DMS.  相似文献   

The X-ray transient XTE J2012+381     

R. I. Hynes  P. Roche †  P. A. Charles  M. J. Coe 《Monthly notices of the Royal Astronomical Society》1999,305(3):L49-L53

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The Be/X-ray transient V0332+53: evidence for a tilt between the orbit and the equatorial plane?     

I. Negueruela  P. Roche  J. Fabregat  M. J. Coe 《Monthly notices of the Royal Astronomical Society》1999,307(3):695-702

We present optical and infrared observations of BQ Cam, the optical counterpart to the Be/X-ray transient system V0332+53. BQ Cam is shown to be an O8–9Ve star, which places V0332+53 at a distance of ∼7 kpc. H α spectroscopy and infrared photometry are used to discuss the evolution of the circumstellar envelope. Owing to the low inclination of the system, parameters are strongly constrained. We find strong evidence for a tilt of the orbital plane with respect to the circumstellar disc (presumably on the equatorial plane). Even though the periastron distance is only ≈10 R _*, during the present quiescent state the circumstellar disc does not extend to the distance of periastron passage. Under these conditions, X-ray emission is effectively prevented by centrifugal inhibition of accretion. The circumstellar disc is shown to be optically thick at optical and infrared wavelengths, which, together with its small size, is taken as an indication of tidal truncation.  相似文献   

Book Review Forum—Learning the City with Colin Mcfarlane     

Neil M. Coe  Ananya Roy  Kevin Ward  Andrew Harris  Ola Söderström  Tim Bunnell 《Urban geography》2013,34(1):131-150

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