title: The soil geochemistry in the Beardmore Glacier Region, Antarctica: Implications for terrestrial ecosystem history

authors: Lyons, W.B.

abstract: Although most models suggest continental Antarctica was covered by ice during the Last Glacial Maximum (LGM) it has been speculated that endemic species of soil invertebrates could have survived the Pleistocene at high elevation habitats protruding above the ice sheets. We analyzed a series of soil samples from different elevations at three locations along the Beardmore Glacier in the Transantarctic Mountains (in order of increasing elevation): Ebony Ridge (ER), Cloudmaker (CM), and Meyer Desert (MD). Geochemical analyses show the MD soils, which were exposed during the LGM, were the least weathered compared to lower elevations, and also had the highest total dissolved solids (TDS). MD soils are dominated by nitrate salts (NO₃/Cl ratios >10) that can be observed in SEM images. High δ¹⁷O and δ¹⁸O values of the nitrate indicate that its source is solely of atmospheric origin. It is suggested that nitrate concentrations in the soil may be utilized to determine a relative “wetting age” to better assess invertebrate habitat suitability. The highest elevation sites at MD have been exposed and accumulating salts for the longest times, and because of the salt accumulations, they were not suitable as invertebrate refugia during the LGM.

text: The soil geochemistry in the Beardmore Glacier Region, Antarctica: Implications for terrestrial ecosystem history Although most models suggest continental Antarctica was covered by ice during the Last Glacial Maximum (LGM) it has been speculated that endemic species of soil invertebrates could have survived the Pleistocene at high elevation habitats protruding above the ice sheets. We analyzed a series of soil samples from different elevations at three locations along the Beardmore Glacier in the Transantarctic Mountains (in order of increasing elevation): Ebony Ridge (ER), Cloudmaker (CM), and Meyer Desert (MD). Geochemical analyses show the MD soils, which were exposed during the LGM, were the least weathered compared to lower elevations, and also had the highest total dissolved solids (TDS). MD soils are dominated by nitrate salts (NO₃/Cl ratios >10) that can be observed in SEM images. High δ¹⁷O and δ¹⁸O values of the nitrate indicate that its source is solely of atmospheric origin. It is suggested that nitrate concentrations in the soil may be utilized to determine a relative “wetting age” to better assess invertebrate habitat suitability. The highest elevation sites at MD have been exposed and accumulating salts for the longest times, and because of the salt accumulations, they were not suitable as invertebrate refugia during the LGM.

year: 2016

title: Methods for improving heat exchanger area distribution and storage temperature selection in heat recovery loops

authors: Walmsley, Michael R.W.

abstract: Inter-plant Heat Integration across a large site can be achieved using a HRL (Heat Recovery Loop). In this paper the interrelationship between HRL storage temperatures, heat recovery and total HRL exchanger area is investigated. A methodology for designing a HRL based on a ΔTmin approach is compared to three programming optimisation approaches where heat exchangers are constrained to have the same NTU (Number of Heat Transfer Units), LMTD (Log-Mean Temperature Difference) or to find the absolute MTA (Minimum Total Area) for a given heat recovery level. Analysis is performed using time-averaged and transient mass flow rate data and temperature data. The actual temperature driving force of the HRL heat exchangers is compared to the apparent driving force as indicated by the Composite Curves. Results for the same heat recovery level show that the ΔTmin approach is effective at minimising total area to within 5% of the minimum area approach. Allocation of individual heat exchanger areas can vary widely depending on the optimisation method, the characteristics of the transient stream data and the differences in the approach and exit stream temperatures. Results suggest that using the ΔTmin method for selecting storage temperatures in combination with sizing exchangers based on the time average CP values (for while the process is running) gives a near optimal solution without requiring lots of data input or computing resources

text: Methods for improving heat exchanger area distribution and storage temperature selection in heat recovery loops Inter-plant Heat Integration across a large site can be achieved using a HRL (Heat Recovery Loop). In this paper the interrelationship between HRL storage temperatures, heat recovery and total HRL exchanger area is investigated. A methodology for designing a HRL based on a ΔTmin approach is compared to three programming optimisation approaches where heat exchangers are constrained to have the same NTU (Number of Heat Transfer Units), LMTD (Log-Mean Temperature Difference) or to find the absolute MTA (Minimum Total Area) for a given heat recovery level. Analysis is performed using time-averaged and transient mass flow rate data and temperature data. The actual temperature driving force of the HRL heat exchangers is compared to the apparent driving force as indicated by the Composite Curves. Results for the same heat recovery level show that the ΔTmin approach is effective at minimising total area to within 5% of the minimum area approach. Allocation of individual heat exchanger areas can vary widely depending on the optimisation method, the characteristics of the transient stream data and the differences in the approach and exit stream temperatures. Results suggest that using the ΔTmin method for selecting storage temperatures in combination with sizing exchangers based on the time average CP values (for while the process is running) gives a near optimal solution without requiring lots of data input or computing resources

year: 2013

title: Rebel discourses: Colonial violence, Pai Marire resistance and land allocation at Tauranga

authors: Kahotea, Des Tatana

abstract: This thesis is a study of resistance and power in a colonial situation, based on the ethnography of a confiscated-land claim of three hapu who had been Kingitanga supporters and Pai Marire adherents in the 19th century. It draws on archival material and insider ethnography and is arranged into four parts. The first part looks at the relationship between anthropology and colonialism, particularly the role of Sir George Grey, a Governor who used anthropological knowledge to facilitate colonial domination of Maori. Grey instigated the establishment of learned societies which introduced the use of ethnology and anthropology to study Maori. This led to the development of colonial anthropology and its emphasis on salvage anthropology in the late nineteenth century, which in turn gave rise to an intellectual tradition of Maori anthropology. The first proponents of Maori anthropology, Te Rangihiroa and Apirana Ngata, emphasised the role of anthropology for cultural recovery and 'insider' ethnographer. The second part examines the Kingitanga and Pai Marire political and religious expressions of resistance. Political resistance to colonialism was met by legislation by the settler colonial government to punish 'rebellion', a system of collaboration or cultivation of 'loyalty' amongst 'friendly' Maori, and other policies directed at suppressing indigenous expressions of rebel consciousness. This programme had a major bearing on the ongoing existence of these hapu into the twentieth century. Pai Marire was a rebel religious phenomenon that became the object of a campaign of coercion, surveillance, and violence by the settler colonial government. The adherents were subject to policies of exclusion from the redistribution and allocation of confiscated land by local government officials and civil commissioners. The government supported, instead, the land claims of 'friendly' and 'surrendered rebel' chiefs. The third part is hapu ethnography. Key transformations in the nineteenth and twentieth centuries related to changing political and kin alliances for one hapu, Ngati Kahu, while another hapu, Ngati Pango which was involved with Pai Marire, suffered from claims on their traditional lands leading to the undermining of its identity and existence as a socially operating hapu. The fourth part uses historical and ethnographic fragments to consider what Pai Marire meant to its adherents. The colonial construct of Pai Marire and Hauhau was forms of savagery and a mix of Christian syncretism, an image that has little changed from the nineteenth century.

text: Rebel discourses: Colonial violence, Pai Marire resistance and land allocation at Tauranga This thesis is a study of resistance and power in a colonial situation, based on the ethnography of a confiscated-land claim of three hapu who had been Kingitanga supporters and Pai Marire adherents in the 19th century. It draws on archival material and insider ethnography and is arranged into four parts. The first part looks at the relationship between anthropology and colonialism, particularly the role of Sir George Grey, a Governor who used anthropological knowledge to facilitate colonial domination of Maori. Grey instigated the establishment of learned societies which introduced the use of ethnology and anthropology to study Maori. This led to the development of colonial anthropology and its emphasis on salvage anthropology in the late nineteenth century, which in turn gave rise to an intellectual tradition of Maori anthropology. The first proponents of Maori anthropology, Te Rangihiroa and Apirana Ngata, emphasised the role of anthropology for cultural recovery and 'insider' ethnographer. The second part examines the Kingitanga and Pai Marire political and religious expressions of resistance. Political resistance to colonialism was met by legislation by the settler colonial government to punish 'rebellion', a system of collaboration or cultivation of 'loyalty' amongst 'friendly' Maori, and other policies directed at suppressing indigenous expressions of rebel consciousness. This programme had a major bearing on the ongoing existence of these hapu into the twentieth century. Pai Marire was a rebel religious phenomenon that became the object of a campaign of coercion, surveillance, and violence by the settler colonial government. The adherents were subject to policies of exclusion from the redistribution and allocation of confiscated land by local government officials and civil commissioners. The government supported, instead, the land claims of 'friendly' and 'surrendered rebel' chiefs. The third part is hapu ethnography. Key transformations in the nineteenth and twentieth centuries related to changing political and kin alliances for one hapu, Ngati Kahu, while another hapu, Ngati Pango which was involved with Pai Marire, suffered from claims on their traditional lands leading to the undermining of its identity and existence as a socially operating hapu. The fourth part uses historical and ethnographic fragments to consider what Pai Marire meant to its adherents. The colonial construct of Pai Marire and Hauhau was forms of savagery and a mix of Christian syncretism, an image that has little changed from the nineteenth century.

year: 2005