title: Effect of pore forming agents on geopolymer porosity and mechanical properties

authors: Kaliappan, Suresh K.

abstract: Generation of industrial waste materials such as fly ash and slag in bulk provides an opportunity to convert these wastes into eco-friendly, value-added products. A geopolymer, a strong, porous and environmentally friendly material, was synthesized by mixing fly-ash with an alkaline activator, followed by addition of a pore forming agent (PFA) which created voids of varied pore sizes within the mixture. This polymer has potential applications as an adsorbent or membrane material; however, there is no established technology to regulate the pore size. Corn oil, waste palm oil and starch were investigated as potential organic additives to produce geopolymer materials with pore sizes suitable for water treatment membranes. Geopolymer without additives had a compressive strength of 30.93 MPa. Corn oil induced the highest porosity of up to 26.6 % with a compressive strength of 9.9 MPa, waste palm oil at 21.3 % and 9.0 MPa and starch at 17.9 % and 20.41 MPa. SEM analysis revealed that the voids and tunnels formation increased with increased PFA dosage.

text: Effect of pore forming agents on geopolymer porosity and mechanical properties Generation of industrial waste materials such as fly ash and slag in bulk provides an opportunity to convert these wastes into eco-friendly, value-added products. A geopolymer, a strong, porous and environmentally friendly material, was synthesized by mixing fly-ash with an alkaline activator, followed by addition of a pore forming agent (PFA) which created voids of varied pore sizes within the mixture. This polymer has potential applications as an adsorbent or membrane material; however, there is no established technology to regulate the pore size. Corn oil, waste palm oil and starch were investigated as potential organic additives to produce geopolymer materials with pore sizes suitable for water treatment membranes. Geopolymer without additives had a compressive strength of 30.93 MPa. Corn oil induced the highest porosity of up to 26.6 % with a compressive strength of 9.9 MPa, waste palm oil at 21.3 % and 9.0 MPa and starch at 17.9 % and 20.41 MPa. SEM analysis revealed that the voids and tunnels formation increased with increased PFA dosage.

year: 2018

title: Copyright law, designs law, and the protection of public art and works on public display

authors: Kingsbury, Anna

subjects: copyright law

abstract: Artworks, designs and architectural forms situated in public places implicate a number of interests. There is a public interest, which arises simply by virtue of situating a work in a public place. More broadly, there is a public interest that arises from the public investment in the work – investment both in terms of money and investment in terms of meaning as people identify with and relate to a particular work. Public works can become important to individuals as landmarks, icons, or locations for significant public or personal events.

text: Copyright law, designs law, and the protection of public art and works on public display Artworks, designs and architectural forms situated in public places implicate a number of interests. There is a public interest, which arises simply by virtue of situating a work in a public place. More broadly, there is a public interest that arises from the public investment in the work – investment both in terms of money and investment in terms of meaning as people identify with and relate to a particular work. Public works can become important to individuals as landmarks, icons, or locations for significant public or personal events.

year: 2007

title: The science and practice of Māori astronomy and Matariki

authors: Whaanga, Hēmi

subjects: Indigenous Knowledge

abstract: Ki te iwi Mäori me öna tüpuna, ko ngä hua o te noho tahi, o te äta pänui, o te körero anö hoki me ngä whetü, he mea äta tuitui ki te pütaiao, ki te ahureatanga, ki ngä tikanga aho atua, ki te taiao anö hoki. Ko ngä nekehanga o ngä kähui whetü he mea äta pänui, ka mutu he whakapono, he mätauranga atu anö hoki tö ia iwi, tö ia takiwä puta noa i a Aotearoa nei mö te ao tukupü. Ko te mätauranga whänui mö te kökörangi he mea äta whakatö ki ngä ähuatanga o te päpori Mäori o mua, he mea äta whakaora anö hoki ki ngä körero tuku iho, ki ngä tikanga hauhake whenua, ka mutu i äta whakaurua ki roto i ngä tikanga whakatü whare tupuna. Tau atu, tau mai, whakanuia ai te rewanga ake me te tönga iho o ngä whetü hiahira, ka mutu i kaha whakaatuahia ngä kaupapa katoa o te tuarangi ahakoa pëhea. Mä roto mai i tënei pepa ka körerohia te mätauranga me te pütaiao mätai arorangi e whai iho nei ki a Matariki, ka tahi, ka rua ka wänangahia te whakarauora haeretanga i ngä tikanga tuku iho e hängai nei ki taua kähui whetü me tana pänga nuitanga ki te ahurea o te whenua o näianei, o Aotearoa.

text: The science and practice of Māori astronomy and Matariki Ki te iwi Mäori me öna tüpuna, ko ngä hua o te noho tahi, o te äta pänui, o te körero anö hoki me ngä whetü, he mea äta tuitui ki te pütaiao, ki te ahureatanga, ki ngä tikanga aho atua, ki te taiao anö hoki. Ko ngä nekehanga o ngä kähui whetü he mea äta pänui, ka mutu he whakapono, he mätauranga atu anö hoki tö ia iwi, tö ia takiwä puta noa i a Aotearoa nei mö te ao tukupü. Ko te mätauranga whänui mö te kökörangi he mea äta whakatö ki ngä ähuatanga o te päpori Mäori o mua, he mea äta whakaora anö hoki ki ngä körero tuku iho, ki ngä tikanga hauhake whenua, ka mutu i äta whakaurua ki roto i ngä tikanga whakatü whare tupuna. Tau atu, tau mai, whakanuia ai te rewanga ake me te tönga iho o ngä whetü hiahira, ka mutu i kaha whakaatuahia ngä kaupapa katoa o te tuarangi ahakoa pëhea. Mä roto mai i tënei pepa ka körerohia te mätauranga me te pütaiao mätai arorangi e whai iho nei ki a Matariki, ka tahi, ka rua ka wänangahia te whakarauora haeretanga i ngä tikanga tuku iho e hängai nei ki taua kähui whetü me tana pänga nuitanga ki te ahurea o te whenua o näianei, o Aotearoa.

year: 2020