title: Use of granite and basalt rock powders as replacement materials in cement production

authors: Ma, Kaiyue

abstract: The use of pozzolanic materials, rock powder or fly ash, as an additive to replace some cement additives is considered an innovative and cost-effective way to reduce the negative impact of cement production on the environment. There is no report, however, on the addition of rock powder in cement, which is the key motivation for undertaking this research project. In this study, the physical, chemical and compression properties of cement mortart with different percentages of Granite Rock Powder and Basalt Rock Powder (10, 15, 20, and 25%) were investigated, and were compared to that of cement with fly ash. The compressive tests were conducted at 7 and 28 days. The effect of different percentages of rock powders and fly ash on the microstructure was also conducted in order to provide a better understanding on how these three materials affect cement mortar performance. The results showed that mortars with 10% of Granite Rock Powder and 10% Basalt Rock Powder first obtained higher strength, but were lower than control-1 (100% cement). Compared with ordinary concrete, the strength of the 25% fly ash group increases rapidly, and it is expected to obtain higher strengths in the later stages.

text: Use of granite and basalt rock powders as replacement materials in cement production The use of pozzolanic materials, rock powder or fly ash, as an additive to replace some cement additives is considered an innovative and cost-effective way to reduce the negative impact of cement production on the environment. There is no report, however, on the addition of rock powder in cement, which is the key motivation for undertaking this research project. In this study, the physical, chemical and compression properties of cement mortart with different percentages of Granite Rock Powder and Basalt Rock Powder (10, 15, 20, and 25%) were investigated, and were compared to that of cement with fly ash. The compressive tests were conducted at 7 and 28 days. The effect of different percentages of rock powders and fly ash on the microstructure was also conducted in order to provide a better understanding on how these three materials affect cement mortar performance. The results showed that mortars with 10% of Granite Rock Powder and 10% Basalt Rock Powder first obtained higher strength, but were lower than control-1 (100% cement). Compared with ordinary concrete, the strength of the 25% fly ash group increases rapidly, and it is expected to obtain higher strengths in the later stages.

year: 2019

title: Looking to the future: M-learning with the iPad

authors: Melhuish, Karen

subjects: education

abstract: Might Apple’s new iPad gain unprecedented traction in education, or is just another example of the over-hyping of new devices in a time of technological determinism (Postman, 2000)? This paper explores the potential affordances and limitations of the Apple iPad in the wider context of emergent mobile learning theory, and the social and economic drivers that fuel technology development. Against the background of effective teaching and learning, the functionality offered by the iPad, and its potential uses for learning, are discussed. A critical review of the way the iPad may support learning, that draws on learning theory, contemporary articles and e-learning literature, suggests that the device may offer an exciting platform for consuming and creating content in a collaborative, interactive way. However, of greater importance is that effective, evidence-driven, innovative practices, combined with a clear-sighted assessment of the advantages and limitations of any product, should take priority over the device itself.

text: Looking to the future: M-learning with the iPad Might Apple’s new iPad gain unprecedented traction in education, or is just another example of the over-hyping of new devices in a time of technological determinism (Postman, 2000)? This paper explores the potential affordances and limitations of the Apple iPad in the wider context of emergent mobile learning theory, and the social and economic drivers that fuel technology development. Against the background of effective teaching and learning, the functionality offered by the iPad, and its potential uses for learning, are discussed. A critical review of the way the iPad may support learning, that draws on learning theory, contemporary articles and e-learning literature, suggests that the device may offer an exciting platform for consuming and creating content in a collaborative, interactive way. However, of greater importance is that effective, evidence-driven, innovative practices, combined with a clear-sighted assessment of the advantages and limitations of any product, should take priority over the device itself.

year: 2010

title: Hidden hunger in a land of plenty: Food insecurity in Aotearoa New Zealand

authors: Graham, Rebekah Sarah

subjects: children, food, Māori, material hardship, scholar-activism

abstract: Aotearoa New Zealand is a relatively wealthy, food-producing nation. Yet, increasing numbers of the populace are experiencing food insecurity, hidden hunger, and material hardship. More than an individual issue, ensuring food security requires consideration of the social and cultural components of growing, preparing, and consuming food and meals. Access to sufficient food to eat and the surrounding social practices are central to human flourishing. This article documents three research exemplars that challenge dominant global representations of Aotearoa New Zealand as an idyllic haven. Each case explores the invisibility and downplaying of hunger and poverty that occur within this ‘land of plenty’. In describing and reflecting our respective research projects we illustrate how broader socio-political and economic factors play out materially in the everyday lives of marginalised groups by restricting access to food. Given that community psychologists have values which necessitate a critical praxis, we have the responsibility to challenge power differences and practices based on historical perceptions that serve to maintain inequities.

text: Hidden hunger in a land of plenty: Food insecurity in Aotearoa New Zealand Aotearoa New Zealand is a relatively wealthy, food-producing nation. Yet, increasing numbers of the populace are experiencing food insecurity, hidden hunger, and material hardship. More than an individual issue, ensuring food security requires consideration of the social and cultural components of growing, preparing, and consuming food and meals. Access to sufficient food to eat and the surrounding social practices are central to human flourishing. This article documents three research exemplars that challenge dominant global representations of Aotearoa New Zealand as an idyllic haven. Each case explores the invisibility and downplaying of hunger and poverty that occur within this ‘land of plenty’. In describing and reflecting our respective research projects we illustrate how broader socio-political and economic factors play out materially in the everyday lives of marginalised groups by restricting access to food. Given that community psychologists have values which necessitate a critical praxis, we have the responsibility to challenge power differences and practices based on historical perceptions that serve to maintain inequities.

year: 2022