A5051939175- Oceanographic and Atmospheric Processes
- Coastal and Marine Dynamics
- Tropical and Extratropical Cyclones Research
- Chalcogenide Semiconductor Thin Films
- Marine and fisheries research
- 2D Materials and Applications
- Wind Energy Research and Development
- Coastal and Marine Management
- Fish Ecology and Management Studies
- Coastal wetland ecosystem dynamics
- Hybrid Renewable Energy Systems
- Climate variability and models
- Advanced Semiconductor Detectors and Materials
- Ocean Waves and Remote Sensing
- Marine and coastal ecosystems
- Crystal Structures and Properties
- Machine Learning in Materials Science
- Energy Load and Power Forecasting
- Oil Spill Detection and Mitigation
- Land Use and Ecosystem Services
- Global Energy Security and Policy
- Advanced Chemical Physics Studies
- Quantum Dots Synthesis And Properties
- Aeolian processes and effects
- Renewable energy and sustainable power systems
Marine Scotland
2015-2024
Scottish Government
2011-2024
Scottish Association For Marine Science
2020
Centre for Environment, Fisheries and Aquaculture Science
2020
University of Liverpool
2011-2012
National Oceanography Centre
2011-2012
University of Ulster
1973-1979
University of Cambridge
1972
For pt. II see ibid., vol. 5, 746 (1972). The semiempirical tight binding method is applied to the calculation of electronic band structures MoS2, MoSe2, alpha -MoTe2, WS2 and WSe2 in a two dimensional approximation. After review structure physical properties these compounds, symmetry relevant Brillouin zones, including effects spin, discussed. With this material one can fit calculated all five compounds experimental data. Some fine optical spectra be interpreted by extending work into three...
For pt. I see ibid., vol. 5, 738 (1972). The band structures of some group IVA dichalcogenides-ZrS2, ZrSe2, HfS2, HfSe2-are calculated using a semiempirical tight binding method. A symmetry analysis the crystal structure is given together with selection rules for optical transitions. experimental properties materials are reviewed and certain features in transmission spectra used to fix values three parameters calculation. joint density states function computed results this calculations discussed.
The band structures of the group III-VI monochalcogenides GaSe and InSe have been calculated using a semi-empirical tight-binding method in two-dimensional approximation. Many discrepancies between experimental work previous calculations for resolved. results appear first time.
Band structures of the stoichiometric titanium dichalcogenides TiS2, TiSe2 and TiTe2 are calculated using a semi-empirical tight binding method. The results fitted to optical reflectivity absorption data compared with similar calculations on other group IVA dichalcogenides.
The tidal stream energy sector is now at the stage of deploying world's first pre-commercial arrays multiple turbines. It time to study environmental effects much larger full-size arrays, scale and site them appropriately. A theoretical array turbines was designed for Pentland Firth (UK), a strait between Scotland Orkney Islands, which has very fast currents. practical power resource large spanning estimated be 1.64 GW on average. ocean response this amount extraction simulated by an...
Ultraviolet and X-ray induced photoelectron spectroscopy studies have been carried out on single crystals of SnSe2 SnS2. Basal surfaces both materials are inert photothresholds 5.35 eV 6.3 respectively. The kinetic energy distributions excited electrons analysed in terms existing theoretical band calculations. Good agreement exists between experiment calculations based the pseudopotential tight binding methods.
Tidal-stream energy resource can be predicted deterministically, provided tidal harmonics and turbine-device characteristics are known. Many turbine designs exist, all having different (e.g. rated speed), which creates uncertainty in assessment or renewable system-design decision-making. A standardised normalised tidal-stream power-density curve was parameterised with data from 14 operational horizontal-axis turbines mean cut-in speed ∼30% of speed). Applying FES2014 global (1/16° gridded...
Abstract The environmental implications of tidal stream energy extraction need to be evaluated against the potential climate change impacts on marine environment. Here we study how hypothetical very large arrays and a business as usual future scenario can hydrodynamics seasonally stratified shelf sea. Scottish Shelf Model, an unstructured grid three‐dimensional ocean model, has been used reproduce present state NW European continental shelf. Four scenarios have modeled: conditions projected...
For pt.I see ibid., vol.6, no.24, 3631 (1973). The energy band structures of SnS2 and SnSe2 are calculated by a semi-empirical tight-binding method. discussed in relation to the optical properties materials previous calculations which have used pseudopotential technique. Computation valence density states distribution joint for various photon energies is described case SnSe2. These results interpret X-ray ultraviolet excited photoemission data.
[1] Measurements of intrawave sediment entrainment processes are reported above ripples under irregular waves generated in a large-scale flume facility. The data consist substantive observations small-scale collected at high spatial and temporal resolution wave forcing, typical coastal environments. Acoustic measurements were made water velocities, bed forms, suspended concentration over plane rippled beds. During each experiment, taken the crests steep sided ripples, which flow separation...
Abstract Acoustic telemetry was used to track salmon smolts during river migration and into the open marine coastal zone. We compared direction speed with particle tracking simulations test hypothesis that pathways are defined by active swimming current following behaviour. Habitat-specific survival rates, movement speeds, depths directions in riverine, estuarine, habitats were also quantified. Salmon post-smolts did not disperse at random as they entered unrestricted, zone of North sea;...
The band structure of CdI2 has been calculated using a modified semi-empirical tight-binding method and the results obtained have compared with both angularly averaged resolved photoemission spectra. theoretically computed density states distribution is in excellent agreement all main features observed experimentally are reproduced theory. Angularly spectra used to draw up energy dispersion curves directly bands Gamma M K directions Brillouin zone good.
The tight binding method is presented in a form which treats overlap by the of Cholesky decomposition. relevant matrix elements are calculated within nearest neighbours, two- centre approximation. To obtain band structure agreement with experiment, set reduction parameters applied to these elements; key experimental results be elucidated means group theory. This discussed relation molecular orbital
Seawater turbidity due to suspended particulate material (SPM) is an important property of a marine ecosystem, determining the underwater light environment and many aspects biological production ecology. SPM concentrations are largely determined by patterns sediment resuspension from seabed shear stress caused waves currents. Hence planning for construction large scale offshore structures which will alter regional hydrodynamics needs consider consequences concentrations. Here we develop...
Storm surges are an abnormal enhancement of the water level in response to weather perturbations. They have capacity cause damaging flooding coastal regions, especially when they coincide with astronomical high spring tides. Some areas UK suffered particularly surge events, and Firth Clyde is a region risk due its location morphology. Here, we use three-dimensional spatial resolution hydrodynamic model simulate local bathymetric morphological Clyde, disaggregate effects far-field atmospheric...
Abstract The valence band structure as well the location of Ga 3d levels have been investigated for vacuum cleaved GaSe and GaTe single crystals by photoelectron spectroscopy using a synchrotron source. In addition conduction has probed photoemission partial yield electron energy, loss spectroscopy. experimental results are in reasonable agreement with theoretical predictions although calculated widths generally too narrow. A feature spectra is tentatively interpreted terms surface states.
The electronic band structure of vacuum cleaved single-crystal indium selenide has been investigated by X-ray and ultraviolet photoelectron spectroscopy. valence consists three well separated groups, one derived from the Se 4s levels, two p-like wavefunctions. density states calculated using a tight-binding single-layer approximation all major features in experimental spectra are accounted for. spin-orbit splitting electron loss associated with In 4d core level is also reported.
In relation to previous work on Tc behaviour at high pressures (Jerome, 1971), the authors show that anisotropy in resistivity of NbSe2 decreases with pressure, reaching a value about five 45 kb. A crystallographic phase change occurs pressure 33+or-3
The Goto Islands in Nagasaki Prefecture, Japan, contain three parallel channels that are suitable for tidal energy development and the planned location a test centre. Energy extraction is added to 3D numerical hydrodynamic model of region, using sub-grid momentum sink approach, predict effects development. available resource with first-generation turbines estimated at 50–107 MW peak output. Spreading turbine thrust across whole cross-section prevent bypass flow results 64% increase power one...
Abstract The yields and energy distributions of electrons photoemitted from MoS2, α-MoTe2, β-MoTe2, NbSe2 ZrS2 have been investigated the photo-thresholds work functions established. results confirm basic correctness Wilson-Yoffe model for electronic structure these solids but lead to much wider band gaps trigonal prismatic group VIA dichalcogenides. Structure in photoelectric yield spectra as well values thresholds obtained are consistent with an gap separating d-and s-like conduction bands...