title: Biofibre production from chicken feather

authors: Tseng, Fan-Chen Jeanie

subjects: feather

abstract: The global poultry industry generates at least 2 million tonnes of chicken feather every year. Feather fibre has potential as  reinforcement for polymer composites with light-weight, thermal insulation and acoustic dampening properties. This study aimed to develop a process to produce clean fibre recovered from chicken feather. Raw feather was decontaminated by 0.15% sodium hypochlorite in 25 L water at pH 10.0 for two 30 min stages and cleaned by 0.15% hydrogen peroxide in 25 L water for three 30 min stages.  Cleaned feather was comminuted in 300 L water using a centrifugal pump at 30 Hz impeller speed on full recycle for 4 h. Rachis and partially cut feather were removed using a 5 mm filter and fibre was recovered using a 1 mm filter. Wet fibre was dried in an air-forced oven at 70°C. Morphological studies revealed fibre surface remained intact after the treatment process.

text: Biofibre production from chicken feather The global poultry industry generates at least 2 million tonnes of chicken feather every year. Feather fibre has potential as  reinforcement for polymer composites with light-weight, thermal insulation and acoustic dampening properties. This study aimed to develop a process to produce clean fibre recovered from chicken feather. Raw feather was decontaminated by 0.15% sodium hypochlorite in 25 L water at pH 10.0 for two 30 min stages and cleaned by 0.15% hydrogen peroxide in 25 L water for three 30 min stages.  Cleaned feather was comminuted in 300 L water using a centrifugal pump at 30 Hz impeller speed on full recycle for 4 h. Rachis and partially cut feather were removed using a 5 mm filter and fibre was recovered using a 1 mm filter. Wet fibre was dried in an air-forced oven at 70°C. Morphological studies revealed fibre surface remained intact after the treatment process.

year: 2011

title: Influence of powder forging and heat treatment conditions on the properties of the cost-effective Ti-5Al-2.5Fe alloy

authors: Bolzoni, Leandro

abstract: The Ti-5Al-2.5Fe alloy is a cheaper α+β Ti alloy with mechanical performance comparable to those of the Ti-6Al-4V alloy whose cost could be further reduced by producing it via powder metallurgy. In this study, the effect of the thermomechanical deformation temperature on the properties of the Ti-5Al-2.5Fe alloy produced from elemental powders was studied. Furthermore, the effect of the modification of the microstructure via heat treatments on the properties of the forged billets was analysed. This study demonstrates that powder forging can successfully be used to manufacture α+β Ti alloys and the selection of the forging temperature significantly affects the mechanical behaviour, where the lower the forging temperature the stronger and the less ductile the material. The post-processing via solution treatment plus aging generally improves the mechanical properties of the Ti-5Al-2.5Fe alloy, especially in terms of ductility, without compromising the strength.

text: Influence of powder forging and heat treatment conditions on the properties of the cost-effective Ti-5Al-2.5Fe alloy The Ti-5Al-2.5Fe alloy is a cheaper α+β Ti alloy with mechanical performance comparable to those of the Ti-6Al-4V alloy whose cost could be further reduced by producing it via powder metallurgy. In this study, the effect of the thermomechanical deformation temperature on the properties of the Ti-5Al-2.5Fe alloy produced from elemental powders was studied. Furthermore, the effect of the modification of the microstructure via heat treatments on the properties of the forged billets was analysed. This study demonstrates that powder forging can successfully be used to manufacture α+β Ti alloys and the selection of the forging temperature significantly affects the mechanical behaviour, where the lower the forging temperature the stronger and the less ductile the material. The post-processing via solution treatment plus aging generally improves the mechanical properties of the Ti-5Al-2.5Fe alloy, especially in terms of ductility, without compromising the strength.

year: 2023-01-01

title: Maori children : Conceptions of Death and Tangihanga

authors: Jacob, Juanita Emily

subjects: Maori

abstract: Research pertaining to Maori children‟s experiences and perceptions of death and tangihanga is sparse. Much of what is available, relating to children and their experiences with death, particularly death of a loved one, is generalised and stems from Western paradigms of knowledge. In contrast, this study aimed to investigate Maori children‟s experience relating to death and tangi through the eyes of Maori parents. Five areas were explored with Maori parents: (1) childhood experiences of Maori parents relating to death and tangi, (2) parental conceptualisation pertaining to ideas of an afterlife (3) how and when Maori parents talk with children about topics relating to death, tangi and an afterlife (4) how Maori children understand and conceptualise these events, and (5) how these practices will continue on in the future. Findings of this study suggest that Maori children: (a) received abundant support from kinship networks to help them cope with their grief, (b) they were included and involved in all aspects relating to death and tangi, (c) they were encouraged to express emotions openly and without restraint, (d) they understood and comprehended death through personal experience and exposure to tangi, (e) the business of grieving came secondary to the fact that tangi was more like a holiday with family, (f) Maori parents informed and talked to their children about death and tangi, and (g) they often use both Christian ideologies and cultural beliefs to explained death and afterlife to their children. From this study we learn that death was not hidden from children, that parents talked with their children in very open and age relevant ways, and considered their children‟s participation in tangi as an important way to grieve and ensure continuity with kinship networks and support. This study suggests that the challenge now is to ensure that these practices continue to persist between parents and their children, and continue on through generations.

text: Maori children : Conceptions of Death and Tangihanga Research pertaining to Maori children‟s experiences and perceptions of death and tangihanga is sparse. Much of what is available, relating to children and their experiences with death, particularly death of a loved one, is generalised and stems from Western paradigms of knowledge. In contrast, this study aimed to investigate Maori children‟s experience relating to death and tangi through the eyes of Maori parents. Five areas were explored with Maori parents: (1) childhood experiences of Maori parents relating to death and tangi, (2) parental conceptualisation pertaining to ideas of an afterlife (3) how and when Maori parents talk with children about topics relating to death, tangi and an afterlife (4) how Maori children understand and conceptualise these events, and (5) how these practices will continue on in the future. Findings of this study suggest that Maori children: (a) received abundant support from kinship networks to help them cope with their grief, (b) they were included and involved in all aspects relating to death and tangi, (c) they were encouraged to express emotions openly and without restraint, (d) they understood and comprehended death through personal experience and exposure to tangi, (e) the business of grieving came secondary to the fact that tangi was more like a holiday with family, (f) Maori parents informed and talked to their children about death and tangi, and (g) they often use both Christian ideologies and cultural beliefs to explained death and afterlife to their children. From this study we learn that death was not hidden from children, that parents talked with their children in very open and age relevant ways, and considered their children‟s participation in tangi as an important way to grieve and ensure continuity with kinship networks and support. This study suggests that the challenge now is to ensure that these practices continue to persist between parents and their children, and continue on through generations.

year: 2011