title: Design approaches to supercapacitor based surge resistant UPS techniques

authors: Kularatna, Nihal

subjects: Inverters

abstract: Time constants of supercapacitors are in the range of 100mS to tens of seconds compared to the time durations of power line transients, which are usually within a few hundred microseconds. Therefore supercapacitors should withstand short duration surges with energy values specified in IEEE C62-41 series and IEC 61400-4-5 and similar standards. After experimentally confirming this useful property of supercapacitors, new topologies for supercapacitor based surge-resistant uninterruptible power supplies were developed. Paper summarizes the approach to developing suitable topologies for surge-resistant UPS systems based on supercapacitor energy circulation techniques, despite the lower continuous DC voltage ratings of commercial supercapacitors.

text: Design approaches to supercapacitor based surge resistant UPS techniques Time constants of supercapacitors are in the range of 100mS to tens of seconds compared to the time durations of power line transients, which are usually within a few hundred microseconds. Therefore supercapacitors should withstand short duration surges with energy values specified in IEEE C62-41 series and IEC 61400-4-5 and similar standards. After experimentally confirming this useful property of supercapacitors, new topologies for supercapacitor based surge-resistant uninterruptible power supplies were developed. Paper summarizes the approach to developing suitable topologies for surge-resistant UPS systems based on supercapacitor energy circulation techniques, despite the lower continuous DC voltage ratings of commercial supercapacitors.

year: 2011

title: Seismic hazard in the Taupo - Reporoa Region

authors: Pyne, Adrian

subjects: Earthquake

abstract: New Zealand lies astride a convergent plate margin, as a result it experiences hundreds of earthquakes a year. This study was commissioned in response to Environment Waikato's contingency planning for such natural disasters.

The Taupo - Reporoa region was identified in a report to Environment Waikato (Waikato Regional Council) as needing to be studied, in order to quantify the level of earthquake hazard. This region lies in the centre of the Taupo Volcanic Zone, and has, over thousands of years built up considerable thicknesses of unconsolidated mainly volcanogenic materials. It is recognised that towns and cities that are sited on these materials are at risk from amplification of seismic waves and will experience greater damage, than if they were on hard rock.

Soils were analysed by the following geotechnical tests: hand penetrometer, Bush penetrometer, shear vane, the standard compression test, and dynamic cyclical loading. Samples were also taken for soil moisture and bulk density. The results from these tests have been used to evaluate the region for seismic hazard, and to semi-quantitatively correlate with reports and claims of damage from earthquakes. A number of parameters were able to be derived from the field tests and the cyclic loading which were used in the final analysis.

The results showed that some soils were substantially weaker than others, which correlated with historical accounts of damage. A seismic microzoning map was constructed on the basis of the difference in soil strengths.

text: Seismic hazard in the Taupo - Reporoa Region New Zealand lies astride a convergent plate margin, as a result it experiences hundreds of earthquakes a year. This study was commissioned in response to Environment Waikato's contingency planning for such natural disasters.

The Taupo - Reporoa region was identified in a report to Environment Waikato (Waikato Regional Council) as needing to be studied, in order to quantify the level of earthquake hazard. This region lies in the centre of the Taupo Volcanic Zone, and has, over thousands of years built up considerable thicknesses of unconsolidated mainly volcanogenic materials. It is recognised that towns and cities that are sited on these materials are at risk from amplification of seismic waves and will experience greater damage, than if they were on hard rock.

Soils were analysed by the following geotechnical tests: hand penetrometer, Bush penetrometer, shear vane, the standard compression test, and dynamic cyclical loading. Samples were also taken for soil moisture and bulk density. The results from these tests have been used to evaluate the region for seismic hazard, and to semi-quantitatively correlate with reports and claims of damage from earthquakes. A number of parameters were able to be derived from the field tests and the cyclic loading which were used in the final analysis.

The results showed that some soils were substantially weaker than others, which correlated with historical accounts of damage. A seismic microzoning map was constructed on the basis of the difference in soil strengths.

year: 1995

title: He aha te mea nui o te ao? He tāngata! (What is the most important thing in the world? It is people!)

authors: Masters-Awatere, Bridgette

subjects: chronic disease prevention

abstract: This paper highlights the importance of people as a central factor in improving health for M aori (Indigenous people of New Zealand). How wh anau (family) relationships, connections, values and inspiration are integral to achieving Indigenous health goals is explained. Descriptions of how community researchers, healthcare staff, consumers and academics worked together to design interventions for two health services (in the Waikato and Bay of Plenty regions) is included. Through highlighting the experiences of health consumers, the potential for future interventions to reduce the advancement of pre-diabetes among wh anau is described. Evidence from the study interviews reinforces the importance of wh anau and whakapapa (heritage) as enabling factors for Indigenous people to improve health. Specifically, the positive effect of wh anau enhancing activities that support peoples’ aspirations of tino rangatiratanga (self-determination) in their lives when engaging with health care has been observed. This study highlights the many positives that have emerged, and offers an opportunity for taking primary health to the next level by placing wh anau alongside Indigenous primary care providers at the centre of change strategies.

text: He aha te mea nui o te ao? He tāngata! (What is the most important thing in the world? It is people!) This paper highlights the importance of people as a central factor in improving health for M aori (Indigenous people of New Zealand). How wh anau (family) relationships, connections, values and inspiration are integral to achieving Indigenous health goals is explained. Descriptions of how community researchers, healthcare staff, consumers and academics worked together to design interventions for two health services (in the Waikato and Bay of Plenty regions) is included. Through highlighting the experiences of health consumers, the potential for future interventions to reduce the advancement of pre-diabetes among wh anau is described. Evidence from the study interviews reinforces the importance of wh anau and whakapapa (heritage) as enabling factors for Indigenous people to improve health. Specifically, the positive effect of wh anau enhancing activities that support peoples’ aspirations of tino rangatiratanga (self-determination) in their lives when engaging with health care has been observed. This study highlights the many positives that have emerged, and offers an opportunity for taking primary health to the next level by placing wh anau alongside Indigenous primary care providers at the centre of change strategies.

year: 2019