title: Participatory Usability: Supporting proactive users

authors: Nichols, David M.

subjects: computer science

abstract: After software has been released the opportunities for users to influence development can often be limited. In this paper we review the research on post-deployment usability and make explicit its connections to open source software development. We describe issues involved in the design of end-user reporting tools with reference to the Safari web browser and a digital library prototype.

text: Participatory Usability: Supporting proactive users After software has been released the opportunities for users to influence development can often be limited. In this paper we review the research on post-deployment usability and make explicit its connections to open source software development. We describe issues involved in the design of end-user reporting tools with reference to the Safari web browser and a digital library prototype.

year: 2003

title: Chemical modification of Dendrocalamus asper bamboo with citric acid and boron compounds: Effects on the physical-chemical, mechanical and thermal properties

authors: Gauss, Christian

abstract: The effect of environmentally friendly treatment using citric acid and boron compounds on the physical-chemical and mechanical properties and thermal degradation of D. asper bamboo was investigated. The chemical modification using citric acid reduced the moisture uptake of bamboo by 32%, the water absorption by 26%, and thickness and width swelling by 43% and 31%, respectively, in comparison with the reference. FTIR analysis revealed the effect of the esterification process with an increase of the carbonyl/hydroxyl absorbance ratio, which explains the reductions in water absorption and swelling. No significant change was identified on the cellulose crystallinity determined by XRD, with only a small increase of the boron-treated samples. TG/DSC measurements showed that boron compounds cause a reduction of weight loss and decrease the exothermic heat flow upon heating under synthetic air flow. However, the modification with citric acid caused slightly higher thermal degradation in the same conditions of testing, which was overcome by the addition of boron compounds in the treatment solution. Enhanced mechanical performance was observed on bamboo samples treated only with boron compounds, while samples chemically modified by citric acid presented no changes or a small increase in compression and bending properties. Nevertheless, fibre detachment and structural changes on hemicellulose/cellulose caused a small decrease in shear strength and a considerable decrease, about 30%, in tensile strength. The overall results provided an insightful understanding regarding the chemical modification of bamboo, revealing new possibilities of treatment for the improvements of dimensional and thermal stability without the use of hazardous chemicals.

text: Chemical modification of Dendrocalamus asper bamboo with citric acid and boron compounds: Effects on the physical-chemical, mechanical and thermal properties The effect of environmentally friendly treatment using citric acid and boron compounds on the physical-chemical and mechanical properties and thermal degradation of D. asper bamboo was investigated. The chemical modification using citric acid reduced the moisture uptake of bamboo by 32%, the water absorption by 26%, and thickness and width swelling by 43% and 31%, respectively, in comparison with the reference. FTIR analysis revealed the effect of the esterification process with an increase of the carbonyl/hydroxyl absorbance ratio, which explains the reductions in water absorption and swelling. No significant change was identified on the cellulose crystallinity determined by XRD, with only a small increase of the boron-treated samples. TG/DSC measurements showed that boron compounds cause a reduction of weight loss and decrease the exothermic heat flow upon heating under synthetic air flow. However, the modification with citric acid caused slightly higher thermal degradation in the same conditions of testing, which was overcome by the addition of boron compounds in the treatment solution. Enhanced mechanical performance was observed on bamboo samples treated only with boron compounds, while samples chemically modified by citric acid presented no changes or a small increase in compression and bending properties. Nevertheless, fibre detachment and structural changes on hemicellulose/cellulose caused a small decrease in shear strength and a considerable decrease, about 30%, in tensile strength. The overall results provided an insightful understanding regarding the chemical modification of bamboo, revealing new possibilities of treatment for the improvements of dimensional and thermal stability without the use of hazardous chemicals.

year: 2021

title: Te Tarata

authors: Maxwell, Te Kahautu

abstract: This composition placed second in the Haka Composition Section. Te Tarata this composition commemorates the battle of Te Tarata in Te Whakatōhea 15 October 1865. This was the aftermath of the killing of the missionary Rev Carl Sylvius Volkner on the 2 March 1865. At the battle of Te Tarata it is recorded as the only calvary charge in the New Zealand Land Wars. Te Whakatōhea ingeniously wove around the palisade walls tī kouka (Cordyline australis) or cabbage tree. When the canon ball hit the palisades the tī kouka absorbed the force of the canon ball and rebounded the ball. 20 Te Whakatohea were killed and a number of others were wounded. This composition was performed by Ōpōtiki Mai Tawhiti at the Te Matatini World Championship Kapa Haka Competition 2015.

text: Te Tarata This composition placed second in the Haka Composition Section. Te Tarata this composition commemorates the battle of Te Tarata in Te Whakatōhea 15 October 1865. This was the aftermath of the killing of the missionary Rev Carl Sylvius Volkner on the 2 March 1865. At the battle of Te Tarata it is recorded as the only calvary charge in the New Zealand Land Wars. Te Whakatōhea ingeniously wove around the palisade walls tī kouka (Cordyline australis) or cabbage tree. When the canon ball hit the palisades the tī kouka absorbed the force of the canon ball and rebounded the ball. 20 Te Whakatohea were killed and a number of others were wounded. This composition was performed by Ōpōtiki Mai Tawhiti at the Te Matatini World Championship Kapa Haka Competition 2015.

year: 2014-10-10