697 research outputs found
High resolution electronic spectroscopy of inorganic molecules seeded into a supersonic free jet
No full textSIGLEAvailable from British Library Document Supply Centre- DSC:D71561/87 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
The nature of domestic electricity-loads and effects of time averaging on statistics and on-site generation calculations
No full textWright was lead author. Firth is a Research Assistant, supervised by Wright
Photoresponse of ZnO tetrapod nanocrystal Schottky diodes
No full textThe fabrication of an ultraviolet photodiode employing a single ZnO tetrapod nanocrystal is reported. We have attached two tungsten leads and one platinum lead to three of the arms of the tetrapod. By measuring the transport properties between each pair of leads we show that the tungsten contacts are ohmic and the platinum contacts are rectifying. Photoresponse measurements were carried out with above and below band gap illumination. We observe a much larger ultraviolet photoresponse for the rectifying Pt-ZnO-W junction than the linear W-ZnO-W junction. We conclude that the enhanced photoresponse of our rectifying junction results from a photoinduced reduction of the Schottky barrier height at the Pt-ZnO interface
The OZDRAW user's manual / Steven Firth, Michael J. Zyda.
No full textOZDRAW is an interactive figure generation system designed to operate on the IRIS 2400 workstations. The aim of OZDRAW is to provide a powerful, yet friendly, general purpose figure generation system to allow untrained users to produce high quality figures that can be used for presentations, technical papers and academic theses. OZDRAW has been designed so that the user can efficiently operate the system with little or no experience. The system uses pop-up menus to provide the user with the available instructions; menus use text rather than icons to provide an interface that is less ambiguous to the inexperienced user. The system requirements for OZDRAW are: (1) an IRIS 2400 workstation, ideally with three megabytes of memory and a floating-point accelerator, and (2) the IRIS mouse (3) a graphics printer capable of quality graphics production; a laser printer is the preferred printerN0001485WR4B001The work reported herein was supported by Contract from the
Office of Naval Research.http://archive.org/details/ozdrawusersmanua00fir
Synthesis and characterisation of zinc oxide tetrapod nanocrystals
No full textZinc oxide is an important group II-VI semiconductor material with optical properties that permit stable- emission at room temperature. We report on the synthesis of highly uniform nanocrystalline ZnO tetrapod (ZnO-T) nanostructures through a modified chemical vapour transport process. These self assembled nanocrystals are characterised by four cylindrical arms with a hexagonal facet all of which are joined at a tetrahedral core. Studies are carried out on ZnO tetrapods using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), photoluminescence spectroscopy (PLS) and Raman measurements. We find a simple technique to quench visible emission found in ZnO tetrapods as grown. We also observe Raman active modes suggesting that nitrogen is incorporated within our samples
ZnO tetrapod Schottky photodiodes
No full textThe fabrication of an ultraviolet photodiode employing a single ZnO tetrapod nanocrystal is reported. This diode structure is prepared by depositing W and Pt electrodes to form Ohmic and Schottky contacts, respectively. Dark current-voltage measurements show rectifying behavior. The properties of the metal-semiconductor interface are studied with above and below band gap illumination. It is found that with increasing UV excitation the device converts from a rectifying to an Ohmic behavior. This effect is attributed to a flattening of the energy bands due to the migration of photogenerated carriers within the space charge region at the metal-semiconductor interface
Firth logistic regression results.
No full text<p>Site-specific results of Firth logistic regression between sampling periods.</p><p>**denotes 0.01 significance level.</p
The east coast of Scotland bottlenose dolphin population : improving understanding of ecology outside the Moray Firth SAC
No full textHabitat use by bottlenose dolphins: seasonal distribution and stratified movement patterns in the Moray Firth, Scotland
No full text1. This study investigated the distribution of a population of bottlenose dolphins Tursiops truncatus resident in the Moray Firth off north-eastern Scotland. Results add to existing information from studies in tropical areas to provide a better understanding of area use in this species.2. Boat-based surveys and photo-identification techniques were used to study the distribution and movements of individually recognizable dolphins over a 3-year period.3. Dolphins were seen in all months of the year, but there were consistent seasonal fluctuations in the number of individuals present. Numbers were low in winter and spring and peaked in summer and autumn.4. Dolphins were seen throughout the survey area but were concentrated in three regions. Each had similar topographic features being centred on deep, narrow channels subject to strong tidal flows.5. Area use by dolphins changed with season. The outer part of the inner Moray Firth study area was used for most of the year and areas closer to the head of the firth were used seasonally.6. The summer increase in numbers of dolphins in the inner Moray Firth was not simply due to incomers diluting an already resident population. Instead, there was a stratified movement of all individuals. This persistent geographical stratification suggests that competition between individuals or social groupings may shape spatial distribution in this population.7. Individuals exhibited rapid movements across the population's range. For instance, one individual was sighted at locations 190 km apart within a 5-day period.8. In terms of conservation, the high use of areas at the mouths of the inner firths warrants special attention. Furthermore, the stratification patterns amongst dolphins suggest that individuals do not move freely within the inner Moray Firth and therefore may be unable to move away from localized disturbance or pollution.</p
Storegga Slide
No full textGlasgow-based author of short stories and psychological thrillers, Louise has developed a poetic statement about our shared origins and culture, accompanied by a series of words translated between Scots and European mainland languages which demonstrate that though our dialects are different we can still be understood.
Emlyn Firth will use a typographic approach to illustrate Louise’s work, playing with themes of language and communication
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