title: Cost-affordable and qualified powder metallurgy metastable beta titanium alloy by designing short-process consolidation and processing

authors: Zhao, Qinyang

abstract: Short-time processing route has been designed to manufacture cost-affordable and high-quality powder metallurgy (PM) metastable β titanium alloy, containing rapid powder consolidation (modified thermomechanical pressing), one-step thermomechanical processing (simple open die uniaxial hot forging by industrial press) and fast heat treatment (one-step annealing at various temperatures for only one hour). Based on comprehensive microstructure characterizations and mechanical property examinations, underlying microstructural evolution mechanism and microstructure-property relationship of the produced alloys were uncovered and elucidated thoroughly. Homogeneous macrostructure and fine-grain microstructure without undissolved particles and large pores are obtained for the alloy after thermomechanical powder consolidation as a result of the concurrent effect of external deformation and high-temperature diffusion. One-step open-die forging is verified to produce full-dense and sound PM alloy pancake with large-scale and high strength. Attributed to the harmonious concurrence of hierarchical α precipitation and heterogeneous grain structure, synergistic strength-ductility combinations are achieved for the alloy after specific processing and heat treatment with the tensile strength and strain at failure values of 1386.5 MPa/7.3% and 1252.3 MPa/9.0%, respectively. These strength-ductility combinations are comparable and/or even better than other metastable β titanium alloys prepared by some PM and ingot metallurgy approaches with relatively high cost and time consumption.

text: Cost-affordable and qualified powder metallurgy metastable beta titanium alloy by designing short-process consolidation and processing Short-time processing route has been designed to manufacture cost-affordable and high-quality powder metallurgy (PM) metastable β titanium alloy, containing rapid powder consolidation (modified thermomechanical pressing), one-step thermomechanical processing (simple open die uniaxial hot forging by industrial press) and fast heat treatment (one-step annealing at various temperatures for only one hour). Based on comprehensive microstructure characterizations and mechanical property examinations, underlying microstructural evolution mechanism and microstructure-property relationship of the produced alloys were uncovered and elucidated thoroughly. Homogeneous macrostructure and fine-grain microstructure without undissolved particles and large pores are obtained for the alloy after thermomechanical powder consolidation as a result of the concurrent effect of external deformation and high-temperature diffusion. One-step open-die forging is verified to produce full-dense and sound PM alloy pancake with large-scale and high strength. Attributed to the harmonious concurrence of hierarchical α precipitation and heterogeneous grain structure, synergistic strength-ductility combinations are achieved for the alloy after specific processing and heat treatment with the tensile strength and strain at failure values of 1386.5 MPa/7.3% and 1252.3 MPa/9.0%, respectively. These strength-ductility combinations are comparable and/or even better than other metastable β titanium alloys prepared by some PM and ingot metallurgy approaches with relatively high cost and time consumption.

year: 2021

title: Improving student learning? Research evidence about teacher feedback for improvement in New Zealand schools.

authors: Eyers, Gayle

subjects: students

abstract: The importance of giving both evaluative and descriptive feedback to improve learning and achievement has been confirmed through research. This paper draws on assessment and feedback research to interrogate the evidence about how well teachers use feedback in New Zealand classrooms. It reveals that there is very little New Zealand research that investigates NZ teachers' use of feedback. Those studies that do investigate teachers' use of assessment information show that very little of the information gained from assessment is used to inform students about how to improve. More often teachers praise students, give unspecific information about their work and use the data gathered about students' competence and skills for school-wide aggregation and evidence of meeting targets. Questions are raised about why this might be the case, how professional development might be implicated in this and how the situation might be improved through wider policy alignment at both local and national levels.

text: Improving student learning? Research evidence about teacher feedback for improvement in New Zealand schools. The importance of giving both evaluative and descriptive feedback to improve learning and achievement has been confirmed through research. This paper draws on assessment and feedback research to interrogate the evidence about how well teachers use feedback in New Zealand classrooms. It reveals that there is very little New Zealand research that investigates NZ teachers' use of feedback. Those studies that do investigate teachers' use of assessment information show that very little of the information gained from assessment is used to inform students about how to improve. More often teachers praise students, give unspecific information about their work and use the data gathered about students' competence and skills for school-wide aggregation and evidence of meeting targets. Questions are raised about why this might be the case, how professional development might be implicated in this and how the situation might be improved through wider policy alignment at both local and national levels.

year: 2004

title: Co-constructions of gender and ethnicity in New Zealand television advertising

authors: Michelle, Carolyn

subjects: television advertising

abstract: This paper reports key findings from a content analysis of gender and ethnic depictions in a sample of 2,120 New Zealand prime-time television advertisements screened in 2006. The study explored the following questions: With what product categories are male and female White, Māori/Pasifika and Asian characters most commonly associated? What are the most common occupational roles of male and female White, Māori/Pasifika and Asian characters? The results reveal highly stereotypical depictions of women and men within each ethnic category. White men dominated advertisements for foodstuffs, telecommunications and financial/corporate/legal services and were over-represented as professionals/white collar workers, while White women were over-represented in advertisements for household products, personal products, and medical products and featured predominantly as homemakers. Māori/Pasifika men were over-represented as athletes and service and sales workers. Non-White women featured prominently within multi-ethnic groups in advertisements for personal grooming products and most frequently featured as glamour models, while non-White men were over-represented as blue collar workers. Largely absent were Māori/Pasifika women and Asians of both genders, potentially exacerbating the multiple axes of subordination encountered by these groups in the New Zealand context.

text: Co-constructions of gender and ethnicity in New Zealand television advertising This paper reports key findings from a content analysis of gender and ethnic depictions in a sample of 2,120 New Zealand prime-time television advertisements screened in 2006. The study explored the following questions: With what product categories are male and female White, Māori/Pasifika and Asian characters most commonly associated? What are the most common occupational roles of male and female White, Māori/Pasifika and Asian characters? The results reveal highly stereotypical depictions of women and men within each ethnic category. White men dominated advertisements for foodstuffs, telecommunications and financial/corporate/legal services and were over-represented as professionals/white collar workers, while White women were over-represented in advertisements for household products, personal products, and medical products and featured predominantly as homemakers. Māori/Pasifika men were over-represented as athletes and service and sales workers. Non-White women featured prominently within multi-ethnic groups in advertisements for personal grooming products and most frequently featured as glamour models, while non-White men were over-represented as blue collar workers. Largely absent were Māori/Pasifika women and Asians of both genders, potentially exacerbating the multiple axes of subordination encountered by these groups in the New Zealand context.

year: 2011