title: Supercapacitor-buffered DC-operable refrigerators for DC homes

authors: Gallage, NP

abstract: Efficiency improvements in whiteware will help reduce the overall power consumption of a household. Modern inverter-driven whiteware, such as refrigerators, operates internally on a DC bus, permitting direct powering from the DC bus of a renewable energy system. However, the fluctuating nature of renewable energy DC sources mandates an energy storage system to increase the reliability of DC operations. In this paper, we present the data related to the conversion of a 230 V, 50 Hz AC operable household refrigerator to operate from a solar DC bus, with a supercapacitor bank forming an integral part of a supercapacitor-assisted (SCA) low frequency DC-DC converter. In addition, experimental results of DC camping refrigerator powered from a solar DC bus and the essential details of the new low-frequency SCA converter are also presented.

text: Supercapacitor-buffered DC-operable refrigerators for DC homes Efficiency improvements in whiteware will help reduce the overall power consumption of a household. Modern inverter-driven whiteware, such as refrigerators, operates internally on a DC bus, permitting direct powering from the DC bus of a renewable energy system. However, the fluctuating nature of renewable energy DC sources mandates an energy storage system to increase the reliability of DC operations. In this paper, we present the data related to the conversion of a 230 V, 50 Hz AC operable household refrigerator to operate from a solar DC bus, with a supercapacitor bank forming an integral part of a supercapacitor-assisted (SCA) low frequency DC-DC converter. In addition, experimental results of DC camping refrigerator powered from a solar DC bus and the essential details of the new low-frequency SCA converter are also presented.

year: 2024

title: The investor recognition hypothesis: the New Zealand case

authors: Chai, Daniel J.P.

subjects: economics

abstract: Recently, Kaniel et al. (2005) find that the Investor Recognition Hypothesis (IRH) is valid across countries. The New Zealand (NZ) stock market is among the developed countries which exhibit significant High-Volume Return Premiums (HVRP) supporting the IRH. In this article, we reexamine Kaniel et al.'s finding for the NZ stock market. We confirm that HVRP does exist in NZ stocks. However, when we classify NZ stocks into large, medium and small size categories, the HVRP exists actually only in medium sized stocks. When we further partition NZ medium size stocks into penny and nonpenny stocks, the HVRP exists only in nonpenny stocks.

text: The investor recognition hypothesis: the New Zealand case Recently, Kaniel et al. (2005) find that the Investor Recognition Hypothesis (IRH) is valid across countries. The New Zealand (NZ) stock market is among the developed countries which exhibit significant High-Volume Return Premiums (HVRP) supporting the IRH. In this article, we reexamine Kaniel et al.'s finding for the NZ stock market. We confirm that HVRP does exist in NZ stocks. However, when we classify NZ stocks into large, medium and small size categories, the HVRP exists actually only in medium sized stocks. When we further partition NZ medium size stocks into penny and nonpenny stocks, the HVRP exists only in nonpenny stocks.

year: 2010

title: The challenges of culture to psychology and post-modern thinking

authors: Waldegrave, Charles

subjects: Maori

abstract: Someone at a workshop in the Waikato once said to us, “You know a Maori, if they want to, can always learn to be a psychologist, but a psychologist can’t learn to be a Maori”. Cultural knowledge may or may not be accompanied by social science knowledge. Cultural knowledge can stand on its own. Those who possess it, and choose to work in the institutions we are associated with, have gifts this country desperately needs. All our organisations require such people, and they need to be properly resourced, have employment security and control over their work. Their own work away from our organisations also requires adequate resourcing. They can heal their own in ways that we will never be able to. They will almost certainly offer the field rich alternative metaphors and meanings that can free us from the tired old medical, biological and social science ones. This also has implications for those in other branches of psychology, including research, experimental and industrial psychology. There is perhaps a unique opportunity for psychologists in this country of Aotearoa/New Zealand to recognise other ways of describing events, which will lead to creative practices and enable the health and welfare resources to get to those who most need them, on their own terms. It would also enable other people, other workers from other cultures to develop new paradigms, and new shifts in our field. This will not lead to the abandonment of social science, but it will enable that body of knowledge, to sit appropriately along side other realms of knowledge such as gender knowledge, and cultural knowledge, without dominating. A new experience for the social scientists, but I suspect a liberating one!

text: The challenges of culture to psychology and post-modern thinking Someone at a workshop in the Waikato once said to us, “You know a Maori, if they want to, can always learn to be a psychologist, but a psychologist can’t learn to be a Maori”. Cultural knowledge may or may not be accompanied by social science knowledge. Cultural knowledge can stand on its own. Those who possess it, and choose to work in the institutions we are associated with, have gifts this country desperately needs. All our organisations require such people, and they need to be properly resourced, have employment security and control over their work. Their own work away from our organisations also requires adequate resourcing. They can heal their own in ways that we will never be able to. They will almost certainly offer the field rich alternative metaphors and meanings that can free us from the tired old medical, biological and social science ones. This also has implications for those in other branches of psychology, including research, experimental and industrial psychology. There is perhaps a unique opportunity for psychologists in this country of Aotearoa/New Zealand to recognise other ways of describing events, which will lead to creative practices and enable the health and welfare resources to get to those who most need them, on their own terms. It would also enable other people, other workers from other cultures to develop new paradigms, and new shifts in our field. This will not lead to the abandonment of social science, but it will enable that body of knowledge, to sit appropriately along side other realms of knowledge such as gender knowledge, and cultural knowledge, without dominating. A new experience for the social scientists, but I suspect a liberating one!

year: 1993