title: Re-interpreting old dates: Radiocarbon determinations from the Tokelau Islands (South Pacific)

authors: Petchey, Fiona

subjects: radiocarbon

abstract: A re-evaluation of available archaeological radiocarbon dates from the Tokelau Islands in West Polynesia demonstrates that careful assessment is essential when developing chronologies from previously published radiocarbon data. The new calibration results point to concurrent and continual human occupation of Fakaofo and Atafu from at least 750-550 years ago up until European contact in AD 1765.

text: Re-interpreting old dates: Radiocarbon determinations from the Tokelau Islands (South Pacific) A re-evaluation of available archaeological radiocarbon dates from the Tokelau Islands in West Polynesia demonstrates that careful assessment is essential when developing chronologies from previously published radiocarbon data. The new calibration results point to concurrent and continual human occupation of Fakaofo and Atafu from at least 750-550 years ago up until European contact in AD 1765.

year: 2010

title: Syntheses and molecular structures of some compounds containing many-atom chains end-capped by tricobalt carbonyl clusters

authors: Bruce, Michael I.

subjects: cobalt cluster

abstract: Several complexes containing Co₃ carbonyl clusters end-capping carbon chains of various lengths are described. Pd(0)/Cu(I)-catalysed reactions between {Co₃{μ₃-C(Ctriple bond; length of mdashC)₂Au(PPh₃)}(μ-dppm)(CO)₇ and I(Ctriple bond; length of mdashC)₂SiMe₃ or FcCtriple bond; length of mdashCI gave {Co₃{μ₃-C(Ctriple bond; length of mdashC)xR}(μ-dppm)(CO)₇ [x = 4, R = SiMe₃3; x = 3, R = Fc 8]; treatment of 3 with NaOMe and AuCl(PPh₃) gave 4 [x = 4, R = Au(PPh3)]. Related preparations of Co₃{μ₃-C(Ctriple bond; length of mdashC)₂[Ru(PP)Cp′]}(μ-dppm)n(CO)9−2n [PP = (PPh₃)₂, Cp’ = Cp, n = 1, 5; PP = dppe, Cp′ = Cp∗, n = 1, 6; 0, 7] are also described. Syntheses of bis-cluster complexes {Co₃(μ-dppm)(CO)₇}₂(μ-Cx) (x = 14, 12; 16, 9; 18, 11; 26, 10) – the latter being the longest cluster-capped Cx chains so far described – and the mercury-bridged compounds Hg{(Ctriple bond; length of mdashC)xC[Co₃(μ-dppm)(CO)₇]}₂ (x = 1, 13; 2, 14) are reported. The molecular structures of 7, 12, 13 and 14, as well as of Co₃(μ₃-CCtriple bond; length of mdashCSiMe₃)(μ-dppm)(CO)₆(PPh₃) (15) and Co₃{μ₃-CC(O)OEt}(μ-dppm)(CO)₇ (16), are reported.

text: Syntheses and molecular structures of some compounds containing many-atom chains end-capped by tricobalt carbonyl clusters Several complexes containing Co₃ carbonyl clusters end-capping carbon chains of various lengths are described. Pd(0)/Cu(I)-catalysed reactions between {Co₃{μ₃-C(Ctriple bond; length of mdashC)₂Au(PPh₃)}(μ-dppm)(CO)₇ and I(Ctriple bond; length of mdashC)₂SiMe₃ or FcCtriple bond; length of mdashCI gave {Co₃{μ₃-C(Ctriple bond; length of mdashC)xR}(μ-dppm)(CO)₇ [x = 4, R = SiMe₃3; x = 3, R = Fc 8]; treatment of 3 with NaOMe and AuCl(PPh₃) gave 4 [x = 4, R = Au(PPh3)]. Related preparations of Co₃{μ₃-C(Ctriple bond; length of mdashC)₂[Ru(PP)Cp′]}(μ-dppm)n(CO)9−2n [PP = (PPh₃)₂, Cp’ = Cp, n = 1, 5; PP = dppe, Cp′ = Cp∗, n = 1, 6; 0, 7] are also described. Syntheses of bis-cluster complexes {Co₃(μ-dppm)(CO)₇}₂(μ-Cx) (x = 14, 12; 16, 9; 18, 11; 26, 10) – the latter being the longest cluster-capped Cx chains so far described – and the mercury-bridged compounds Hg{(Ctriple bond; length of mdashC)xC[Co₃(μ-dppm)(CO)₇]}₂ (x = 1, 13; 2, 14) are reported. The molecular structures of 7, 12, 13 and 14, as well as of Co₃(μ₃-CCtriple bond; length of mdashCSiMe₃)(μ-dppm)(CO)₆(PPh₃) (15) and Co₃{μ₃-CC(O)OEt}(μ-dppm)(CO)₇ (16), are reported.

year: 2008

title: Ka hao te rangatahi: Rangatahi Māori experiences of climate change

authors: Areta, Ranginui Charlton

subjects: Rangatahi Māori

abstract: Ka pū te rūhā, ka hao te rangatahi - Climate change is well established as one of the earth’s most pressing global issues, whereby Māori and Indigenous communities are more vulnerable to its impacts. Internationally, youth have been participating in a range of climate activism, demanding rapid and adequate responses to climate change from decision makers; with Indigenous youth advocating for Indigenous rights to be centred in these responses. More often than not, research on youth involvement in climate change focusses on the general youth population and sidelines the experiences of minorities such as global Indigenous communities. Due to this inattention, there is a lack of research focussing on rangatahi Māori experiences and perceptions of climate change, leaving rangatahi Māori to advocate for their voices to be heard.
The purpose of this research is to amplify the voices of rangatahi Māori regarding climate change, beyond where rangatahi are already sharing their voices. It focusses on rangatahi perceptions of climate change, specifically exploring how being Māori, and youth, influence their experience. This includes investigating the role rangatahi have within climate change, and any challenges and supportive factors that rangatahi may experience related to climate change.
This thesis utilises Kaupapa Māori and its guiding principles to ground this research agenda, employing Pūrākau methodology to guide research methods. Specifically, semi-structured whakawhitinga kōrero were undertaken with five rangatahi Māori participants, who are passionate about climate change and the taiao, exploring each of their diverse experiences and understandings of climate change. Following a process involving thematic and Pūrākau methodology inspired analysis, key themes from each of the rangatahi whakawhitinga kōrero are presented within a case study, maintaining individual narratives for each rangatahi.
This research found that rangatahi experience is grounded in whakapapa, shaping connection to the taiao, motivations to care about climate change, and encompassed aspirations and hopes regarding climate change responses. These narratives highlight that the exclusion of rangatahi from research spaces leaves a gap in literature that explores youth understandings on climate change. Further findings established that the participants believe that being a rangatahi presents unique skills and perspective to offer to climate spaces. Lastly, through exploring participants experiences of specifically being a rangatahi Māori, the findings of this thesis offer tangible opportunities to support rangatahi in voicing their concerns regarding climate change, as this was an identified challenge.
Ultimately, exploring the rangatahi participants’ understandings contributes to: shaping the narratives of rangatahi Māori experience of climate change; further diversifying Māori understandings of climate change and responses; and amplifying the voices of Māori youth within the growing set of literature on youth engagement in climate change. This research lays a foundation for the voices of rangatahi Māori to be actively included in climate change research, and further contest Western misconceptions that rangatahi must gain more experience to contribute to changing the world.

text: Ka hao te rangatahi: Rangatahi Māori experiences of climate change Ka pū te rūhā, ka hao te rangatahi - Climate change is well established as one of the earth’s most pressing global issues, whereby Māori and Indigenous communities are more vulnerable to its impacts. Internationally, youth have been participating in a range of climate activism, demanding rapid and adequate responses to climate change from decision makers; with Indigenous youth advocating for Indigenous rights to be centred in these responses. More often than not, research on youth involvement in climate change focusses on the general youth population and sidelines the experiences of minorities such as global Indigenous communities. Due to this inattention, there is a lack of research focussing on rangatahi Māori experiences and perceptions of climate change, leaving rangatahi Māori to advocate for their voices to be heard.
The purpose of this research is to amplify the voices of rangatahi Māori regarding climate change, beyond where rangatahi are already sharing their voices. It focusses on rangatahi perceptions of climate change, specifically exploring how being Māori, and youth, influence their experience. This includes investigating the role rangatahi have within climate change, and any challenges and supportive factors that rangatahi may experience related to climate change.
This thesis utilises Kaupapa Māori and its guiding principles to ground this research agenda, employing Pūrākau methodology to guide research methods. Specifically, semi-structured whakawhitinga kōrero were undertaken with five rangatahi Māori participants, who are passionate about climate change and the taiao, exploring each of their diverse experiences and understandings of climate change. Following a process involving thematic and Pūrākau methodology inspired analysis, key themes from each of the rangatahi whakawhitinga kōrero are presented within a case study, maintaining individual narratives for each rangatahi.
This research found that rangatahi experience is grounded in whakapapa, shaping connection to the taiao, motivations to care about climate change, and encompassed aspirations and hopes regarding climate change responses. These narratives highlight that the exclusion of rangatahi from research spaces leaves a gap in literature that explores youth understandings on climate change. Further findings established that the participants believe that being a rangatahi presents unique skills and perspective to offer to climate spaces. Lastly, through exploring participants experiences of specifically being a rangatahi Māori, the findings of this thesis offer tangible opportunities to support rangatahi in voicing their concerns regarding climate change, as this was an identified challenge.
Ultimately, exploring the rangatahi participants’ understandings contributes to: shaping the narratives of rangatahi Māori experience of climate change; further diversifying Māori understandings of climate change and responses; and amplifying the voices of Māori youth within the growing set of literature on youth engagement in climate change. This research lays a foundation for the voices of rangatahi Māori to be actively included in climate change research, and further contest Western misconceptions that rangatahi must gain more experience to contribute to changing the world.

year: 2023