title: Supercapacitor-assisted LED (SCALED) technique for renewable energy systems: a very low frequency design approach with short-term DC-UPS capability eliminating battery banks

authors: Jayananda, Dilini

subjects: Science & Technology

abstract: The fluctuating nature of solar energy necessitates suitable energy storage systems. Compared to typical battery banks, supercapacitors offer longer cycle life eliminating the need to replace them regularly. However, compared to a typical maximum power point tracking controller, where the battery bank and resistive load fed by a switch-mode DC–DC converter allows impedance matching for maximum power transfer, a supercapacitor bank's significantly large capacitive load does not permit the typical impedance matching for maximum power transfer. This study compares the theoretical difference between battery versus supercapacitor energy storage, and highlights of the supercapacitor-assisted LED converter technique in achieving high-efficiency renewable energy-based DC-microgrid systems.

text: Supercapacitor-assisted LED (SCALED) technique for renewable energy systems: a very low frequency design approach with short-term DC-UPS capability eliminating battery banks The fluctuating nature of solar energy necessitates suitable energy storage systems. Compared to typical battery banks, supercapacitors offer longer cycle life eliminating the need to replace them regularly. However, compared to a typical maximum power point tracking controller, where the battery bank and resistive load fed by a switch-mode DC–DC converter allows impedance matching for maximum power transfer, a supercapacitor bank's significantly large capacitive load does not permit the typical impedance matching for maximum power transfer. This study compares the theoretical difference between battery versus supercapacitor energy storage, and highlights of the supercapacitor-assisted LED converter technique in achieving high-efficiency renewable energy-based DC-microgrid systems.

year: 2020

title: The Sorcerers' Apprentice: A life of Reo Franklin Fortune, Anthropologist

authors: Thomas, Caroline

subjects: Fortune, Reo Franklin

abstract: Between the two World Wars, the two main schools in world anthropology were the American and the British. The former was dominated by Franz Boas and his graduate students, while in Britain and its Empire the dominant figures were A. R. Radcliffe-Brown and Bronislaw Malinowski. These leaders acted as patrons to their students, assisting them in getting access to funding, field locations, and jobs. Few crossed the divide to work in both the paradigms and their respective institutions, but one who did was Reo Franklin Fortune. His place within the history of Anthropology has, however, to date remained little more than a footnote. There can be no doubt that Fortune contributed significantly to the development of modern field-based anthropological methods and arguments. All together, he undertook five full years of fieldwork, in cultures located as diversely as the Pacific Islands, New Guinea, East Asia and North America. Contemporary anthropology sometimes remembers Fortune for his well-known ethnographies Sorcerers of Dobu (1932) and Manus Religion (1935). More often, it merely recalls him as the second of Margaret Mead’s three husbands. Unfortunately too, Mead, her friends, and biographers have often portrayed Fortune in an unfavourable light. This work tries to present a more balanced story. It employs archival material to reconstruct the life of Fortune, demonstrating the complexity of his thinking and of his social and academic relationships. Each chapter demarcates a chronological period in Fortune’s life. Wherever possible, his own words and those of his friends, colleagues and associates are used to help tell the story. The person who emerges is highly talented and principled, with a strong sense of honesty and truth, but who is often betrayed or misunderstood by those around him.

text: The Sorcerers' Apprentice: A life of Reo Franklin Fortune, Anthropologist Between the two World Wars, the two main schools in world anthropology were the American and the British. The former was dominated by Franz Boas and his graduate students, while in Britain and its Empire the dominant figures were A. R. Radcliffe-Brown and Bronislaw Malinowski. These leaders acted as patrons to their students, assisting them in getting access to funding, field locations, and jobs. Few crossed the divide to work in both the paradigms and their respective institutions, but one who did was Reo Franklin Fortune. His place within the history of Anthropology has, however, to date remained little more than a footnote. There can be no doubt that Fortune contributed significantly to the development of modern field-based anthropological methods and arguments. All together, he undertook five full years of fieldwork, in cultures located as diversely as the Pacific Islands, New Guinea, East Asia and North America. Contemporary anthropology sometimes remembers Fortune for his well-known ethnographies Sorcerers of Dobu (1932) and Manus Religion (1935). More often, it merely recalls him as the second of Margaret Mead’s three husbands. Unfortunately too, Mead, her friends, and biographers have often portrayed Fortune in an unfavourable light. This work tries to present a more balanced story. It employs archival material to reconstruct the life of Fortune, demonstrating the complexity of his thinking and of his social and academic relationships. Each chapter demarcates a chronological period in Fortune’s life. Wherever possible, his own words and those of his friends, colleagues and associates are used to help tell the story. The person who emerges is highly talented and principled, with a strong sense of honesty and truth, but who is often betrayed or misunderstood by those around him.

year: 2011

title: On equality and colourblindness

authors: Robertson, Neville

subjects: Maori

abstract: "I have a dream that my four children will one day live in a nation where they will not be judged by the color of their skin but by the content of their character." So said Martin Luther King, Jr, just over 40 years ago, in a speech that galvanised the US civil rights movement. King spoke of the United States but his dream is equally relevant in New Zealand. Has it been achieved? Some people would argue that not only has it been achieved but that the tables have been turned and now white folk are the ones who are oppressed. What is needed, they argue, is a level playing field. But how level is the playing field?

text: On equality and colourblindness "I have a dream that my four children will one day live in a nation where they will not be judged by the color of their skin but by the content of their character." So said Martin Luther King, Jr, just over 40 years ago, in a speech that galvanised the US civil rights movement. King spoke of the United States but his dream is equally relevant in New Zealand. Has it been achieved? Some people would argue that not only has it been achieved but that the tables have been turned and now white folk are the ones who are oppressed. What is needed, they argue, is a level playing field. But how level is the playing field?

year: 2004