title: The manufacture and mechanical properties of aligned long harakeke fibre reinforced epoxy composites

authors: Le, Tan Minh

subjects: compression moulding

abstract: Aligned long harakeke fibre reinforced epoxy composites were prepared using hand lay-up followed by compression moulding. Densities of harakeke fibre and epoxy resin were determined for the purpose of composite design. The evenness of composites fabricated by two different size moulds was compared. It was found that more even composites were produced when using a small mould than a big mould. In this work, the dependence of tensile and flexural properties of harakeke/epoxy composites on fibre content was also investigated. The results showed that the addition of fibre enhanced tensile properties of epoxy. The tensile strength and Young’s modulus increased with the volume fraction of harakeke fibre. The flexural strength and flexural modulus increased as the fibre volume fraction increased up to 0.4. Further addition of fibre did not result in an improvement of composite flexural properties.

text: The manufacture and mechanical properties of aligned long harakeke fibre reinforced epoxy composites Aligned long harakeke fibre reinforced epoxy composites were prepared using hand lay-up followed by compression moulding. Densities of harakeke fibre and epoxy resin were determined for the purpose of composite design. The evenness of composites fabricated by two different size moulds was compared. It was found that more even composites were produced when using a small mould than a big mould. In this work, the dependence of tensile and flexural properties of harakeke/epoxy composites on fibre content was also investigated. The results showed that the addition of fibre enhanced tensile properties of epoxy. The tensile strength and Young’s modulus increased with the volume fraction of harakeke fibre. The flexural strength and flexural modulus increased as the fibre volume fraction increased up to 0.4. Further addition of fibre did not result in an improvement of composite flexural properties.

year: 2012-07-09

title: Case-based research in community and social psychology: Introduction to the special issue

authors: Hodgetts, Darrin

subjects: Homelessness

abstract: Cases are highly prevalent in teaching and practice in psychology. Case-based research is crucial for engaged and relevant community and applied social psychologies, but is often subject to critique. This editorial responds to such critiques, clarifies various misconceptions regarding this research strategy, and argues for the utility of case-based research. We explore the theoretical basis and implications of case-based research for community action and participative interventions. This special issue offers a collection of articles that showcase the use of a range of methods in case-based research. Contributions include: (i) a conceptual argument regarding the logic of case studies; (ii) a single-person case study; (iii) a group-level case study; (iv) a multi-site case study, (v) a reflection on challenges of participative research, using the action-researcher as the case. These contributions demonstrate how the use of exemplars is crucial for community and applied social psychologists developing knowledge about social issues in complex and diverse societies, with a view to improving the human condition.

text: Case-based research in community and social psychology: Introduction to the special issue Cases are highly prevalent in teaching and practice in psychology. Case-based research is crucial for engaged and relevant community and applied social psychologies, but is often subject to critique. This editorial responds to such critiques, clarifies various misconceptions regarding this research strategy, and argues for the utility of case-based research. We explore the theoretical basis and implications of case-based research for community action and participative interventions. This special issue offers a collection of articles that showcase the use of a range of methods in case-based research. Contributions include: (i) a conceptual argument regarding the logic of case studies; (ii) a single-person case study; (iii) a group-level case study; (iv) a multi-site case study, (v) a reflection on challenges of participative research, using the action-researcher as the case. These contributions demonstrate how the use of exemplars is crucial for community and applied social psychologists developing knowledge about social issues in complex and diverse societies, with a view to improving the human condition.

year: 2012

title: Dendroarchaeology in New Zealand: extending the range of archaeologically useful species beyond kauri (Agathis australis)

authors: Boswijk, Gretel

abstract: Accurately establishing calendar dates for Māori wooden objects would place them in a secure temporal context and enable aspects of manufacturing and use to be explored within and between sites, and across time. Dendrochronology has the potential to produce accurate and precise calendar dates for wooden artefacts but in New Zealand application of this technique to Māori cultural material is limited as there is almost no overlap between wood species found in archaeological contexts and tree-species with proven suitability for tree-ring dating. Here we identify five archaeologically-useful species – kahikatea (Dacrycarpus dacrydioides), matai (Prumnopitys taxifolia), miro (Prumnopitys ferruginea), rimu (Dacrydium cupressinum) and totara (Podocarpus totara) – and assess their potential for dendrochronology. Of these, matai, miro and totara are identified as species that should be the subject of further comprehensive dendrochronological investigation.

text: Dendroarchaeology in New Zealand: extending the range of archaeologically useful species beyond kauri (Agathis australis) Accurately establishing calendar dates for Māori wooden objects would place them in a secure temporal context and enable aspects of manufacturing and use to be explored within and between sites, and across time. Dendrochronology has the potential to produce accurate and precise calendar dates for wooden artefacts but in New Zealand application of this technique to Māori cultural material is limited as there is almost no overlap between wood species found in archaeological contexts and tree-species with proven suitability for tree-ring dating. Here we identify five archaeologically-useful species – kahikatea (Dacrycarpus dacrydioides), matai (Prumnopitys taxifolia), miro (Prumnopitys ferruginea), rimu (Dacrydium cupressinum) and totara (Podocarpus totara) – and assess their potential for dendrochronology. Of these, matai, miro and totara are identified as species that should be the subject of further comprehensive dendrochronological investigation.

year: 2019