title: Power conditioning and power protection for electronic systems

authors: Kularatna, Nihal

abstract: Electrical energy is the most convenient form of energy, and modern society takes it for granted that it is always available by our side. We have a legacy AC power grid where systems were historically developed based on the assumption that electricity is generated in bulk at far-away sites from our cities and neighbourhoods. Nationwide AC transmission and distribution networks use the advantages of line frequency transformers for voltage conversions with ‘adequate’ efficiency.

Given the distributed nature of these AC power networks, with many long-distance high-voltage transmission lines and electrical substations distributed over wider geographical regions, they are naturally exposed to acts of God, such as extreme weather events and lightning strikes. Furthermore, with the increasing complexity of the power networks, complex control systems are utilized at network substations, which could occasionally have accidental failures due to system reliability issues or human errors. The overall effect is that these unexpected random events could create power quality issues and systemic issues such as overloading and sudden load shedding.

text: Power conditioning and power protection for electronic systems Electrical energy is the most convenient form of energy, and modern society takes it for granted that it is always available by our side. We have a legacy AC power grid where systems were historically developed based on the assumption that electricity is generated in bulk at far-away sites from our cities and neighbourhoods. Nationwide AC transmission and distribution networks use the advantages of line frequency transformers for voltage conversions with ‘adequate’ efficiency.

Given the distributed nature of these AC power networks, with many long-distance high-voltage transmission lines and electrical substations distributed over wider geographical regions, they are naturally exposed to acts of God, such as extreme weather events and lightning strikes. Furthermore, with the increasing complexity of the power networks, complex control systems are utilized at network substations, which could occasionally have accidental failures due to system reliability issues or human errors. The overall effect is that these unexpected random events could create power quality issues and systemic issues such as overloading and sudden load shedding.

year: 2023-03-01

title: Nachhaltigkeitslücken in der frühkindlichen Erziehung: Paradigmatischer und pädagogischer Wandel in Aotearoa Neuseeland?

authors: White, Elizabeth Jayne

abstract: Dieser Beitrag antwortet auf die von Julie Davis geäußerte Kritik an einer erheblichen Forschungslücke im Zusammenhang mit dem Forschungsdiskurs zur Nachhaltigkeit im Bereich der frühkindlichen Pädagogik. Ihre Kritik in Bezug auf die auch international noch unzureichend entwickelte Forschung hebt vor allem auf grundsätzliche Schwierigkeiten von akademischen Untersuchungen im Bereich dieser kindlichen Altersgruppe und auf praktische Probleme bei der Entwicklung neuer wissenschaftlicher Forschungsfelder ab. In diesem Essay wollen wir jedoch auf eine noch grundsätzlichere Dimension dieser Forschungslücke, man könnte auch sagen: dieses Forschungsabgrunds ("research hole"), eingehen, die wir als Resultat eines mangelnden kritischen Dialoges über das, was Nachhaltigkeit for uns, die Lehrer und Lerner eigentlich ist, ansehen.

text: Nachhaltigkeitslücken in der frühkindlichen Erziehung: Paradigmatischer und pädagogischer Wandel in Aotearoa Neuseeland? Dieser Beitrag antwortet auf die von Julie Davis geäußerte Kritik an einer erheblichen Forschungslücke im Zusammenhang mit dem Forschungsdiskurs zur Nachhaltigkeit im Bereich der frühkindlichen Pädagogik. Ihre Kritik in Bezug auf die auch international noch unzureichend entwickelte Forschung hebt vor allem auf grundsätzliche Schwierigkeiten von akademischen Untersuchungen im Bereich dieser kindlichen Altersgruppe und auf praktische Probleme bei der Entwicklung neuer wissenschaftlicher Forschungsfelder ab. In diesem Essay wollen wir jedoch auf eine noch grundsätzlichere Dimension dieser Forschungslücke, man könnte auch sagen: dieses Forschungsabgrunds ("research hole"), eingehen, die wir als Resultat eines mangelnden kritischen Dialoges über das, was Nachhaltigkeit for uns, die Lehrer und Lerner eigentlich ist, ansehen.

year: 2011

title: The discovery of gold at Te Aroha and its consequences: January to October 1880

authors: Hart, Philip

abstract: By mid-1880, when there were expectations that gold would be found at Te Aroha, at last Ngati Rahiri permitted prospecting. A government-subsidized prospecting party under Hone Werahiko set out in early August and announced an apparently valuable find one month later. As the discovery was on Ngati Rahiri land, a goldfield could not be declared open immediately, but despite this increasing numbers of prospectors arrived. Newspapers were cautious, not wanting to encourage a rush based on nothing but rumours, some of them extravagant, notably one of finding ore that would produce 200oz to the ton. 
Despite being doubtful about the prospects, officials prepared to proclaim a new goldfield. In late October, good specimens were shown in Thames, encouraging more to leave both there and the Waikato to explore. After the warden inspected the ground where Werahiko had found gold, which was off limits to everyone except the original prospectors, he arranged to have the only test made before the field was opened. Although this gave an uncertain indication of whether the ore was payable, and little real work was being done outside the prospectors’ claim, regulations were devised permitting the proclamation of the new field.

text: The discovery of gold at Te Aroha and its consequences: January to October 1880 By mid-1880, when there were expectations that gold would be found at Te Aroha, at last Ngati Rahiri permitted prospecting. A government-subsidized prospecting party under Hone Werahiko set out in early August and announced an apparently valuable find one month later. As the discovery was on Ngati Rahiri land, a goldfield could not be declared open immediately, but despite this increasing numbers of prospectors arrived. Newspapers were cautious, not wanting to encourage a rush based on nothing but rumours, some of them extravagant, notably one of finding ore that would produce 200oz to the ton. 
Despite being doubtful about the prospects, officials prepared to proclaim a new goldfield. In late October, good specimens were shown in Thames, encouraging more to leave both there and the Waikato to explore. After the warden inspected the ground where Werahiko had found gold, which was off limits to everyone except the original prospectors, he arranged to have the only test made before the field was opened. Although this gave an uncertain indication of whether the ore was payable, and little real work was being done outside the prospectors’ claim, regulations were devised permitting the proclamation of the new field.

year: 2016