title: Chicken Feather Fibre Mat/PLA Composites for Thermal Insulation

authors: Qin, Xin

subjects: Chicken Feather Fibre Mat

abstract: In order to add more economic value to chicken feather, a waste material of the poultry industry, it has been researched to incorporate chicken feather fibre (CFF) into resin to produce value-added composites. In the present research, chicken feather fibre was separated from the rachises and used to produce fibre mats. Then fibre mats were incorporated into polylactic acid (PLA) to make composites with low thermal conductivity. The procedure for making chicken feather fibre mat using an automatic dynamic sheet former was explored. Two different composite fabrication methods were investigated. One involved fabricate composite samples by hot pressing chicken feather fibre mats with PLA sheet. The other involved making composite specimens by hot pressing PLA powder and chicken feather fibre mats. A decrease in tensile strength compared to PLA had been expected before composite specimen fabricating according to previous research and so alkali treated fibre mats were used to improve tensile strength of composites. 

It was concluded that chicken feather fibre mats with uniform quality could be made by controlling the jet-to-spin ratio and water wall thickness of the dynamic sheet former cylinder. Stable mat/PLA composites could be fabricated by hot pressing chicken feather fibre mats with PLA powder. Results from tensile testing indicated that alkali treatment could improve tensile strength to a small degree. SEM image analysis revealed that poor interfacial bonding between fibre barbs and PLA matrix had occurred. Thermal conductivity testing demonstrated improved thermal insulation with addition of CFF to PLA.

text: Chicken Feather Fibre Mat/PLA Composites for Thermal Insulation In order to add more economic value to chicken feather, a waste material of the poultry industry, it has been researched to incorporate chicken feather fibre (CFF) into resin to produce value-added composites. In the present research, chicken feather fibre was separated from the rachises and used to produce fibre mats. Then fibre mats were incorporated into polylactic acid (PLA) to make composites with low thermal conductivity. The procedure for making chicken feather fibre mat using an automatic dynamic sheet former was explored. Two different composite fabrication methods were investigated. One involved fabricate composite samples by hot pressing chicken feather fibre mats with PLA sheet. The other involved making composite specimens by hot pressing PLA powder and chicken feather fibre mats. A decrease in tensile strength compared to PLA had been expected before composite specimen fabricating according to previous research and so alkali treated fibre mats were used to improve tensile strength of composites. 

It was concluded that chicken feather fibre mats with uniform quality could be made by controlling the jet-to-spin ratio and water wall thickness of the dynamic sheet former cylinder. Stable mat/PLA composites could be fabricated by hot pressing chicken feather fibre mats with PLA powder. Results from tensile testing indicated that alkali treatment could improve tensile strength to a small degree. SEM image analysis revealed that poor interfacial bonding between fibre barbs and PLA matrix had occurred. Thermal conductivity testing demonstrated improved thermal insulation with addition of CFF to PLA.

year: 2015

title: Optimal dynamic regulation of the environmental impact of mining across diverse land types

authors: Doole, Graeme J.

subjects: non-renewable resources

abstract: Optimal dynamic regulation of mineral extraction and environmental rehabilitation across diverse land assets is studied using discrete-time, distributed optimal control. An extension of Hotelling's Rule is derived that indicates the need to manage both processes over space and time to maximise social welfare. Key empirical insights are drawn from a case study involving the Western Australian mineral sands industry. The incorporation of temporal and spatial dimensions allows for greater precision in the analysis of alternative management strategies. However, numerical analysis shows that optimal regulation may not require information-intensive tax instruments if abatement occurs in the year that land is damaged. Rather, a tax that is constant across time or space that provides a sufficient incentive for firms to rehabilitate degraded land can suffice. Bond instruments are shown unequivocally to provide too weak an incentive for timely rehabilitation by mining firms.

text: Optimal dynamic regulation of the environmental impact of mining across diverse land types Optimal dynamic regulation of mineral extraction and environmental rehabilitation across diverse land assets is studied using discrete-time, distributed optimal control. An extension of Hotelling's Rule is derived that indicates the need to manage both processes over space and time to maximise social welfare. Key empirical insights are drawn from a case study involving the Western Australian mineral sands industry. The incorporation of temporal and spatial dimensions allows for greater precision in the analysis of alternative management strategies. However, numerical analysis shows that optimal regulation may not require information-intensive tax instruments if abatement occurs in the year that land is damaged. Rather, a tax that is constant across time or space that provides a sufficient incentive for firms to rehabilitate degraded land can suffice. Bond instruments are shown unequivocally to provide too weak an incentive for timely rehabilitation by mining firms.

year: 2006

title: Marine inequality, borderization, and the radical potential of kinship

authors: McCormack, Fiona

subjects: Aquaculture

abstract: This article utilizes scholarship on borders to interpret the persistence of inequality in Indigenous seascapes, irrespective of moves to redress colonial wrongs or the growing anthropocenic recognition of human-nature interconnectedness. I examine border politics in the context of Māori claims for marine title and rights and the post-settlement development of aquaculture. Drawing on Harsha Walia’s concept of “border imperialism” and Achille Mbembe’s thesis on “borderization,” the article highlights the endurance of colonial forms alongside their neoliberal transformation into the enclosures and entrapments arising in the context of accelerated marine industrialization. By holding in tension the interconnection between marine environments and kinship, on one hand, and scholarship on borders, on the other, the article suggests that Indigenous Māori kinship, expanding through multiple layers of difference, constitutes a site of resistance that has the potential to refute the logic of borderization.

text: Marine inequality, borderization, and the radical potential of kinship This article utilizes scholarship on borders to interpret the persistence of inequality in Indigenous seascapes, irrespective of moves to redress colonial wrongs or the growing anthropocenic recognition of human-nature interconnectedness. I examine border politics in the context of Māori claims for marine title and rights and the post-settlement development of aquaculture. Drawing on Harsha Walia’s concept of “border imperialism” and Achille Mbembe’s thesis on “borderization,” the article highlights the endurance of colonial forms alongside their neoliberal transformation into the enclosures and entrapments arising in the context of accelerated marine industrialization. By holding in tension the interconnection between marine environments and kinship, on one hand, and scholarship on borders, on the other, the article suggests that Indigenous Māori kinship, expanding through multiple layers of difference, constitutes a site of resistance that has the potential to refute the logic of borderization.

year: 2025