title: Recycling of waste glass as aggregate in cement-based materials

authors: Harrison, Edward

abstract: Glass is a common material made from natural resources such as sand. Although much of the waste glass is recycled to make new glass products, a large proportion is still being sent to landfill. Glass is a useful resource that is non-biodegradable, occupying valuable landfill space. To combat the waste glass that is heading to landfill, alternative recycling forms need to be investigated. The construction industry is one of the largest CO₂ emitters in the world, producing up to 8% of the global CO₂ to produce cement. The use of sand largely depletes natural resources for the creation of mortars or concretes. This review explores the possibilities of incorporating waste glass into cement-based materials. It was found waste glass is unsuitable as a raw material replacement to produce clinker and as a coarse aggregate, due to a liquid state being produced in the kiln and the smooth surface area, respectively. Promising results were found when incorporating fine particles of glass in cement-based materials due to the favourable pozzolanic reaction which benefits the mechanical properties. It was found that 20% of cement can be replaced with waste glass of 20 μm without detrimental effects on the mechanical properties. Replacements higher than 30% can cause negative impacts as insufficient amounts of CaCO₃ remain to react with the silica from the glass, known as the dilution effect. As the fine aggregate replacement for waste glass increases over 20%, the mechanical properties decrease proportionally; however, up to 20% has similar results to traditionally mixes.

text: Recycling of waste glass as aggregate in cement-based materials Glass is a common material made from natural resources such as sand. Although much of the waste glass is recycled to make new glass products, a large proportion is still being sent to landfill. Glass is a useful resource that is non-biodegradable, occupying valuable landfill space. To combat the waste glass that is heading to landfill, alternative recycling forms need to be investigated. The construction industry is one of the largest CO₂ emitters in the world, producing up to 8% of the global CO₂ to produce cement. The use of sand largely depletes natural resources for the creation of mortars or concretes. This review explores the possibilities of incorporating waste glass into cement-based materials. It was found waste glass is unsuitable as a raw material replacement to produce clinker and as a coarse aggregate, due to a liquid state being produced in the kiln and the smooth surface area, respectively. Promising results were found when incorporating fine particles of glass in cement-based materials due to the favourable pozzolanic reaction which benefits the mechanical properties. It was found that 20% of cement can be replaced with waste glass of 20 μm without detrimental effects on the mechanical properties. Replacements higher than 30% can cause negative impacts as insufficient amounts of CaCO₃ remain to react with the silica from the glass, known as the dilution effect. As the fine aggregate replacement for waste glass increases over 20%, the mechanical properties decrease proportionally; however, up to 20% has similar results to traditionally mixes.

year: 2020

title: Thesaurus-based index term extraction for agricultural documents

authors: Medelyan, Olena

subjects: computer science

abstract: This paper describes a new algorithm for automatically extracting index terms from documents relating to the domain of agriculture. The domain-specific Agrovoc thesaurus developed by the FAO is used both as a controlled vocabulary and as a knowledge base for semantic matching. The automatically assigned terms are evaluated against a manually indexed 200-item sample of the FAO’s document repository, and the performance of the new algorithm is compared with a state-of-the-art system for keyphrase extraction.

text: Thesaurus-based index term extraction for agricultural documents This paper describes a new algorithm for automatically extracting index terms from documents relating to the domain of agriculture. The domain-specific Agrovoc thesaurus developed by the FAO is used both as a controlled vocabulary and as a knowledge base for semantic matching. The automatically assigned terms are evaluated against a manually indexed 200-item sample of the FAO’s document repository, and the performance of the new algorithm is compared with a state-of-the-art system for keyphrase extraction.

year: 2005

title: Opening address

authors: Levy, Michelle Patricia

subjects: Maori

abstract: In 2002, the Māori and Psychology Research Unit at the University of Waikato made a valuable contribution to the teaching and practice of psychology in Aotearoa, via the Māori Graduates of Psychology Symposium. The symposium in 2002, with its theme of “Making a Difference” was designed to: provide an opportunity for exposure to role models; bring together Māori graduates of psychology to network and share information; and through the publication and dissemination of the Symposium proceedings provide a resource for teaching and practice in psychology. With over 100 delegates and 30 presentations, the 2002 symposium was widely acknowledged as a success. It resulted in the compilation of proceedings which have become a valuable resource in psychology. 
While there have been informal gatherings and ongoing networking over the past five years, there have been no formal gatherings since that time. We at the Māori and Psychology Research Unit consider it timely in 2007, five years on, to convene another Symposium. Our conversations with Pacific psychologists and recognition of the ties which exist between us as Pacific nations, saw our focus expand to include Pacific psychologists and psychologies.

text: Opening address In 2002, the Māori and Psychology Research Unit at the University of Waikato made a valuable contribution to the teaching and practice of psychology in Aotearoa, via the Māori Graduates of Psychology Symposium. The symposium in 2002, with its theme of “Making a Difference” was designed to: provide an opportunity for exposure to role models; bring together Māori graduates of psychology to network and share information; and through the publication and dissemination of the Symposium proceedings provide a resource for teaching and practice in psychology. With over 100 delegates and 30 presentations, the 2002 symposium was widely acknowledged as a success. It resulted in the compilation of proceedings which have become a valuable resource in psychology. 
While there have been informal gatherings and ongoing networking over the past five years, there have been no formal gatherings since that time. We at the Māori and Psychology Research Unit consider it timely in 2007, five years on, to convene another Symposium. Our conversations with Pacific psychologists and recognition of the ties which exist between us as Pacific nations, saw our focus expand to include Pacific psychologists and psychologies.

year: 2008