title: Polarization tunable selective polariton generator

authors: Sedoglavich, Nemanya

subjects: selective polariton generator

abstract: A selective polariton generator (SPG) design, based on surface plasmon antennae principles, is demonstrated to provide a selective light transmission peak. The polarization-sensitive structure selectively generates and transports polaritons of a desired wavelength through a circular subwavelength aperture. By varying the SPG structure around a central nanohole, we are able to control the peak optical transmission wavelengths via the polarization state of the incident photons. We find good agreement between simulations and experimental results.

text: Polarization tunable selective polariton generator A selective polariton generator (SPG) design, based on surface plasmon antennae principles, is demonstrated to provide a selective light transmission peak. The polarization-sensitive structure selectively generates and transports polaritons of a desired wavelength through a circular subwavelength aperture. By varying the SPG structure around a central nanohole, we are able to control the peak optical transmission wavelengths via the polarization state of the incident photons. We find good agreement between simulations and experimental results.

year: 2009-03

title: Technological infrastructure and implementation environments: The case of laptops for New Zealand teachers.

authors: Cowie, Bronwen

abstract: The integration of ICT is the apparent goal of range of educational initiatives worldwide. To date, however, the impact of ICTs has lagged behind the rhetoric. Rather than technology transforming teaching and learning it appears that teachers often assimilate it into existing practices. This chapter uses Douglas Engelbart’s (1992) notion of an improvement infrastructure to explore and explain the factors that have framed and shaped New Zealand teacher access to, adoption of, and resistance to the use of laptops. Engelbart posits that organizations should aspire to creating three levels of infrastructure for improvement: a core capability infrastructure, an infrastructure that enables the improvement of core work, and an infrastructure that enables the on-going improvement of the improvement processes. Improvement of improvement typically receives the least long-term strategic investment. For teachers with laptops improvement of improvement is what enables teachers to enhance their ability to use their laptop. In this chapter we show that this involves the system of teacher confidence and expertise, teacher professional development opportunities, teacher access to a reliable technological infrastructure, and the existence of a supportive school leadership and culture for ICT/laptop use.

text: Technological infrastructure and implementation environments: The case of laptops for New Zealand teachers. The integration of ICT is the apparent goal of range of educational initiatives worldwide. To date, however, the impact of ICTs has lagged behind the rhetoric. Rather than technology transforming teaching and learning it appears that teachers often assimilate it into existing practices. This chapter uses Douglas Engelbart’s (1992) notion of an improvement infrastructure to explore and explain the factors that have framed and shaped New Zealand teacher access to, adoption of, and resistance to the use of laptops. Engelbart posits that organizations should aspire to creating three levels of infrastructure for improvement: a core capability infrastructure, an infrastructure that enables the improvement of core work, and an infrastructure that enables the on-going improvement of the improvement processes. Improvement of improvement typically receives the least long-term strategic investment. For teachers with laptops improvement of improvement is what enables teachers to enhance their ability to use their laptop. In this chapter we show that this involves the system of teacher confidence and expertise, teacher professional development opportunities, teacher access to a reliable technological infrastructure, and the existence of a supportive school leadership and culture for ICT/laptop use.

year: 2011

title: Ecological, genetic and cultural status of Solanum aviculare, poroporo (Solanaceae)

authors: Weavers, Graeme Morris

subjects: Solanum aviculare

abstract: Solanum aviculare, endemic to Australasia, is an opportunist pioneer secondary successional plant occupying disturbed and open lowland habitats, and was an important medicinal and cultural species to Māori known as poroporo. It is currently in 'decline', the ecological decline appearing to correspond to a decline in knowledge and cultural use of the species. To gain understanding of the reasons for the decline, enhance ecological knowledge, assist conservation and cultural restoration of Solanum aviculare this research documented the successional role and cycle of regeneration dynamics and tactics, established morphological characteristics, investigated the genetic diversity and recorded cultural and conservation information.
The successional status and role was identified. Growth data identified cohort development and inter-site differences, metadata found height and crown spread growth to be significantly correlated and likely part of an early reproduction and dispersal strategy. Germination of soil cores from differing depths confirmed a viable seed bank exists sufficient for species maintenance. Viable seed spread via animal gut passage was determined by germination and chemical tests, results showed rats passed higher rates of viable seed than birds. Seed germination trials with stratified and fresh seed confirmed temporal and depth behaviour, flowering observation documented temporal differences with the closely allied species Solanum laciniatum, indicating a relationship to stasis induction. Leaf morphology studies documented differences between the two allied species and proposed further nomenclature.
Genetic diversity was investigated through the use of PCR/ISSR techniques. Chloroplast DNA was extracted by CTAB and DNA kit protocols. CTAB extraction was unable to effectively remove RNA, although use of DNA samples with high quantities of RNA confirmed that RNA was not an inhibiting factor in PCR production. The production of consistent reliable ISSR bands proved difficult, with no technical explanation found. ISSR findings indicate that Solanum aviculare is highly monomorphic, consisting of predominant invariant monomorphic loci. Twenty primers were tested with no polymorphic loci
identified and no intra species variation documented. Indications were also that Solanum aviculare and Solanum laciniatum are inter species invariant on monomorphic loci. Monomorphic loci may possibly be the evolutionary markers of generic differentiation within Solanum.
Surveys identified Solanum aviculare as uncommon and rare, existing mainly as single plants or small groups in the majority of areas surveyed. The Threatened and Uncommon Plant listing of Solanum aviculare as an 'at risk declining' species is confirmed and a further Recommendation category proposed. Ecological decline and corresponding decline in cultural use and knowledge of Solanum aviculare was identified through specialist interviews; appearing to be related to removal from Māori of control over their land. The name poroporo being now associated mainly with non indigenous Solanum species. Māori cultural concepts in practice were highlighted as fundamentally important to reversing the decline, with an example of a successful traditional practice based (tikanga) integrative collaborative restoration program being documented.
This research forwards that optimal collaborative solutions, programs integrating scientific and tikanga knowledge and practices, provide the best opportunity of reversing the declining trend and for increasing and maintaining knowledge associated with the traditional role of poroporo.

text: Ecological, genetic and cultural status of Solanum aviculare, poroporo (Solanaceae) Solanum aviculare, endemic to Australasia, is an opportunist pioneer secondary successional plant occupying disturbed and open lowland habitats, and was an important medicinal and cultural species to Māori known as poroporo. It is currently in 'decline', the ecological decline appearing to correspond to a decline in knowledge and cultural use of the species. To gain understanding of the reasons for the decline, enhance ecological knowledge, assist conservation and cultural restoration of Solanum aviculare this research documented the successional role and cycle of regeneration dynamics and tactics, established morphological characteristics, investigated the genetic diversity and recorded cultural and conservation information.
The successional status and role was identified. Growth data identified cohort development and inter-site differences, metadata found height and crown spread growth to be significantly correlated and likely part of an early reproduction and dispersal strategy. Germination of soil cores from differing depths confirmed a viable seed bank exists sufficient for species maintenance. Viable seed spread via animal gut passage was determined by germination and chemical tests, results showed rats passed higher rates of viable seed than birds. Seed germination trials with stratified and fresh seed confirmed temporal and depth behaviour, flowering observation documented temporal differences with the closely allied species Solanum laciniatum, indicating a relationship to stasis induction. Leaf morphology studies documented differences between the two allied species and proposed further nomenclature.
Genetic diversity was investigated through the use of PCR/ISSR techniques. Chloroplast DNA was extracted by CTAB and DNA kit protocols. CTAB extraction was unable to effectively remove RNA, although use of DNA samples with high quantities of RNA confirmed that RNA was not an inhibiting factor in PCR production. The production of consistent reliable ISSR bands proved difficult, with no technical explanation found. ISSR findings indicate that Solanum aviculare is highly monomorphic, consisting of predominant invariant monomorphic loci. Twenty primers were tested with no polymorphic loci
identified and no intra species variation documented. Indications were also that Solanum aviculare and Solanum laciniatum are inter species invariant on monomorphic loci. Monomorphic loci may possibly be the evolutionary markers of generic differentiation within Solanum.
Surveys identified Solanum aviculare as uncommon and rare, existing mainly as single plants or small groups in the majority of areas surveyed. The Threatened and Uncommon Plant listing of Solanum aviculare as an 'at risk declining' species is confirmed and a further Recommendation category proposed. Ecological decline and corresponding decline in cultural use and knowledge of Solanum aviculare was identified through specialist interviews; appearing to be related to removal from Māori of control over their land. The name poroporo being now associated mainly with non indigenous Solanum species. Māori cultural concepts in practice were highlighted as fundamentally important to reversing the decline, with an example of a successful traditional practice based (tikanga) integrative collaborative restoration program being documented.
This research forwards that optimal collaborative solutions, programs integrating scientific and tikanga knowledge and practices, provide the best opportunity of reversing the declining trend and for increasing and maintaining knowledge associated with the traditional role of poroporo.

year: 2010