1,236 research outputs found
Dataset for Point-dipole approximation for small systems of strongly coupled radiating nanorods
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Watson, D. W. et al (2019). Point dipole and quadrupole scattering approximation to collectively responding resonator systems. Scientific Reports.</span
Point dipole and quadrupole scattering approximation to collectively responding resonator systems
No full textWe develop a theoretical formalism for collectively responding point scatterers where the radiating electromagnetic fields from each emitter are considered in the electric dipole, magnetic dipole, and electric quadrupole approximation. The contributions of the electric quadrupole moment to electromagnetically-mediated interactions between the scatterers are derived in detail for a system where each scatterer represents a linear RLC circuit resonator, representing common metamaterial resonators in radiofrequency, microwave, and optical regimes. The resulting theory includes a closed set of equations for an ensemble of discrete resonators that are radiatively coupled to each other by propagating electromagnetic fields, incorporating potentially strong interactions and recurrent scattering processes. The effective model is illustrated and tested for examples of pairs of interacting point electric dipoles, where each pair can be qualitatively replaced by a model point emitter with different multipole radiation moments
A critical edition of Derek Walcott's Omeros
No full textThe thesis is a Critical Edition of Derek Walcott’s Omeros, consisting of a Critical
Introduction and Annotations. The Critical Introduction analyses:
- Narrative
- Settings
- Metaphor and Paronomasia
- Symbolism
- Historiography
- Intertexts
- Dualism
- Autobiography
- Dialects
- Prosody.
The Annotations comment on more than 1000 references that may be obscure and on
specifics of narrative, language and prosody.
This study presents new conclusions about some aspects of Omeros:
- It challenges the prevailing view that the work is written substantially in a
variation of terza rima and shows that regular quatrains predominate.
- It demonstrates ways in which the metrics follow the sense of the narrative and
takes a more balanced position on the use of Caribbean as opposed to classical
metrics than that put forward previously.
- It identifies a paragraphic structure to the verse.
- It proposes a new prosodic structure for the significant Chapter XXX/iii.
- It extends Walcott’s recognised use of numerology into word counting the
names of characters.
- It develops the idea of Walcott’s dualism and his use of pairing and
contradiction as a dialectical method.
- It defines his wide use of paronomasia and shows that many of the puns have a
metaphorical aspect beyond mere word-play.
- It analyses some of Walcott’s symbolism.
- It identifies intertextual links to his earlier works and to some thirty other
writers, and suggests homage to Hemingway and possibly Heaney.
- It provides the first complete analysis of Walcott’s rhyme types in Omeros.
In its analysis of Omeros and in the Annotations it has included commentary from
across the critical literature, to provide some sense of other views on Walcott’s
writing, and has included as many as possible of Walcott’s own comments on Omeros
and on the writer’s task, as a background to understanding the poem
Toroidal dipole excitations in metamolecules formed by interacting plasmonic nanorods
No full textWe show how the elusive toroidal dipole moment appears as a radiative excitation eigenmode in a metamolecule resonator that is formed by pairs of plasmonic nanorods. We analyze one such nanorod configuration-a toroidal metamolecule. We find that the radiative interactions in the toroidal metamolecule can be qualitatively represented by a theoretical model based on an electric point dipole arrangement. Both a finite-size rod model and the point dipole approximation demonstrate how the toroidal dipole moment is subradiant and difficult to excite by incident light. By means of breaking the geometric symmetry of the metamolecule, the toroidal mode can be excited by linearly polarized light and appears as a Fano resonance dip in the forward scattered light. We provide simple optimization protocols for maximizing the toroidal dipole mode excitation. This opens up possibilities for simplified control and driving of metamaterial arrays consisting of toroidal dipole unit-cell resonators
Early-life inflammatory events: a risk factor for hearing loss in later life
No full textAge-related hearing loss is a progressive, degenerative condition that affects 50% of individuals over 70. Hearing loss is one of the greatest risk factors for dementia. Lifestyle including smoking, diet and medical history are all associated with susceptibility to loss of hearing with age. We hypothesise that the association between early-life inflammatory events and hearing loss is due to priming of innate immune cells in the auditory system. Otitis media is a chronic early-life inflammatory condition of the middle ear that is associated with recurrent infection. Using a mouse model for otitis media, we are investigating how immune cells in the auditory pathway respond in otitis media and how this is altered when overlaid with an infection (Non-typeable Haemophilus influenzae - NTHi). Immunohistochemical staining identified that otitis media caused increased microglial activation in the auditory system. When overlaid with infection, this response was exacerbated as evidenced by increased Il-1 production and greater susceptibility to infection with NTHi. These results identify that pre-existing middle ear inflammation alters the phenotype of innate immune cells in the auditory system resulting in a heightened inflammatory response to an additional insult. This could lead to greater damage in the auditory pathway and subsequent hearing loss.<br/
Point-dipole approximation for small systems of strongly coupled radiating nanorods
No full textSystems of closely-spaced resonators can be strongly coupled by interactions mediated by scattered electromagnetic fields. In large systems the resulting response has been shown to be more sensitive to these collective interactions than to the detailed structure of individual resonators. Attempts to describe such systems have resulted in point-dipole approximations to resonators that are computationally efficient for large resonator ensembles. Here we provide a detailed study for the validity of point dipole approximations in small systems of strongly coupled plasmonic nanorods, including the cases of both super-radiant and subradiant excitations, where the characteristics of the excitation depends on the spatial separation between the nanorods. We show that over an appreciable range of rod lengths centered on 210 nm, when the relative separation kl in terms of the resonance wave number of light k satisfies kl≳ π/ 2 , the point electric dipole model becomes accurate. However, when the resonators are closer, the finite-size and geometry of the resonators modifies the excitation modes, in particular the cooperative mode line shifts of the point dipole approximation begin to rapidly diverge at small separations. We also construct simplified effective models by describing a pair of nanorods as a single effective metamolecule.</p
Cariboo College papers in archaeology number 3: Archaeological site survey and excavation, Seton Portage - Shalalth : a preliminary report
No full textCariboo College Papers in Archaeology is a series of papers dealing with archaeological research in the Interior Plateau of British Columbia. During July and August of 1974, Derek Wales conducted a Ruppe type 4 archaeological site survey in the Seton Portage-Shalalth area of B.C. Also during the final three weeks of August salvage work was conducted at site EeRn 11. This report presents a preliminary account of both the site survey and salvage work. Submitted to the Archaeological Sites Advisory Board of British Columbia.Peer reviewedArchaeological repor
Cariboo College papers in archaeology number 3: Archaeological site survey and excavation, Seton Portage - Shalalth : a preliminary report
No full textCariboo College Papers in Archaeology is a series of papers dealing with archaeological research in the Interior Plateau of British Columbia. During July and August of 1974, Derek Wales conducted a Ruppe type 4 archaeological site survey in the Seton Portage-Shalalth area of B.C. Also during the final three weeks of August salvage work was conducted at site EeRn 11. This report presents a preliminary account of both the site survey and salvage work. Submitted to the Archaeological Sites Advisory Board of British Columbia.Peer reviewedArchaeological repor
An examination of thematic patterns in selected plays by Derek Walcott
No full textThis dissertation studies Derek Walcott, the preeminent dramatist in the West Indies today, and his contributions to West Indian drama and the West Indian theater. Further, the major themes of isolation, alienation, exile, and the search for identity are closely examined as are the devices Walcott uses in his treatment of these themes. These devices include the older West Indian male as an embodiment of the themes, the white presence of America and England as typified by certain characters, and the folklore of the region including the belief in spirits and the local Anansi folktale. A review of two novels by other West Indian authors, A House for Mr. Biswas by V.S. Naipaul and The Wine of Astonishment by Earl Lovelace, documents the prevalence of the relevant themes in West Indian literature. Moreover, the desirability as well as the possibility of a West Indian unity as implied by the works and themes studied, is, hopefully, demonstrated
The intensity of periperformance : Derek Jarman's "The angelic conversation"
No full textKwaśniewska analyses the political potential of Derek Jarman's film based on Shakespeare's Sonnets. She notices that the film, showing love between two men, is not directly or declaratively engaged in the struggle for equal rights for sexual minorities. Jarman has inscribed homosexual love into a sophisticated artistic, philosophical and existential discourse. However, Kwaśniewska claims that the film is not ideologically neutral. It is determined by the affective potential contained in it, working both within the work and in its relationship with the viewer. According to the author, a subtle, intimate, intense way of showing the relationship between the protagonists, defying conventions and stereotypes, can be much more efficient in influencing the judgments and attitudes of the viewers than an overt political declaration
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