title: Thermal shock properties of Ti(Al,O)/Al₂O₃ and TiAl(O)/Al₂O₃ composite coatings

authors: Salman, Asma Siddiq

subjects: composite coating

abstract: Ti(Al,O)/Al₂O₃ and TiAl(O)/Al₂O₃ composite coatings have a potential to reduce dissolution and aluminium soldering tendency of H13 tool steel used in the aluminium processing industry. The thermal shock resistance of H13 tool steel coated with Ti(Al,O)/Al₂O₃ and TiAl(O)/Al₂O₃ composite powders sprayed using a high velocity oxygen fuel (HVOF) technique was studied. The thermal shock behaviour of the composite coatings was investigated by subjecting the coated coupons to a number of cycles, each cycle consisting of a holding time of 30 seconds in molten aluminium at 700 ± 10 °C followed by quenching into water. The surfaces of the coupons were examined for Al soldering and an evaluation of surface spallation. Any cracks found in the coatings were studied to explain their thermal shock behaviour. The results of this study showed that both Ti(Al,O)/Al₂O₃ and TiAl(O)/Al₂O₃ composite coatings on H13 tool steel have good thermal shock resistance with a thermal shock life between 300 to 400 cycles. The composite coatings and fracture surfaces were analyzed using scanning electron microscopy.

text: Thermal shock properties of Ti(Al,O)/Al₂O₃ and TiAl(O)/Al₂O₃ composite coatings Ti(Al,O)/Al₂O₃ and TiAl(O)/Al₂O₃ composite coatings have a potential to reduce dissolution and aluminium soldering tendency of H13 tool steel used in the aluminium processing industry. The thermal shock resistance of H13 tool steel coated with Ti(Al,O)/Al₂O₃ and TiAl(O)/Al₂O₃ composite powders sprayed using a high velocity oxygen fuel (HVOF) technique was studied. The thermal shock behaviour of the composite coatings was investigated by subjecting the coated coupons to a number of cycles, each cycle consisting of a holding time of 30 seconds in molten aluminium at 700 ± 10 °C followed by quenching into water. The surfaces of the coupons were examined for Al soldering and an evaluation of surface spallation. Any cracks found in the coatings were studied to explain their thermal shock behaviour. The results of this study showed that both Ti(Al,O)/Al₂O₃ and TiAl(O)/Al₂O₃ composite coatings on H13 tool steel have good thermal shock resistance with a thermal shock life between 300 to 400 cycles. The composite coatings and fracture surfaces were analyzed using scanning electron microscopy.

year: 2011

title: Narrativity in becoming sex/gender

authors: Sterling, Rogena

abstract: Most discussions of sex and gender development are discussed as science and expressed as a linear progression from birth as one step as biology develops of which the psychosocial self is built upon. Though biology is an important to a person’s being, including any modifications to it for a variety of reasons, it is not controlling of a person’s identity. At the same time, the concept that biology is a material that is malleable of which a person’s gender is constructed. A person can find in their inner psychological being their true self as male or female that may or may not reflect their assignment at birth. Neither of these tell story of life. A person’s sex/gender is a narrative becoming over time from pre-birth through their death. Becoming includes, when permitted, spiritual and cultural aspects in addition to biological, psychological, and social aspects. When understood within such a narrative, a person’s becoming (development) that reflects their identity as a gender-sex.

text: Narrativity in becoming sex/gender Most discussions of sex and gender development are discussed as science and expressed as a linear progression from birth as one step as biology develops of which the psychosocial self is built upon. Though biology is an important to a person’s being, including any modifications to it for a variety of reasons, it is not controlling of a person’s identity. At the same time, the concept that biology is a material that is malleable of which a person’s gender is constructed. A person can find in their inner psychological being their true self as male or female that may or may not reflect their assignment at birth. Neither of these tell story of life. A person’s sex/gender is a narrative becoming over time from pre-birth through their death. Becoming includes, when permitted, spiritual and cultural aspects in addition to biological, psychological, and social aspects. When understood within such a narrative, a person’s becoming (development) that reflects their identity as a gender-sex.

year: 2022

title: Kia whakatōmuri te haere whakamua: ‘I walk backwards into the future with my eyes fixed on my past’

authors: Rameka, Lesley Kay

subjects: Māori

abstract: This whakataukī or ‘proverb’ speaks to Māori perspectives of time, where the past, the present and the future are viewed as intertwined, and life as a continuous cosmic process. Within this continuous cosmic movement, time has no restrictions – it is both past and present. The past is central to and shapes both present and future identity. From this perspective, the individual carries their past into the future. The strength of carrying one’s past into the future is that ancestors are ever present, existing both within the spiritual realm and in the physical, alongside the living as well as within the living. This article explores Māori perspectives of the past and the models and inspiration they offer. In this way, it provides a critique of the practices in early childhood education, highlighting the importance of cultural concepts and practices, and discusses implications for both teaching and academic practice.

text: Kia whakatōmuri te haere whakamua: ‘I walk backwards into the future with my eyes fixed on my past’ This whakataukī or ‘proverb’ speaks to Māori perspectives of time, where the past, the present and the future are viewed as intertwined, and life as a continuous cosmic process. Within this continuous cosmic movement, time has no restrictions – it is both past and present. The past is central to and shapes both present and future identity. From this perspective, the individual carries their past into the future. The strength of carrying one’s past into the future is that ancestors are ever present, existing both within the spiritual realm and in the physical, alongside the living as well as within the living. This article explores Māori perspectives of the past and the models and inspiration they offer. In this way, it provides a critique of the practices in early childhood education, highlighting the importance of cultural concepts and practices, and discusses implications for both teaching and academic practice.

year: 2017