title: Numerical calculation of series and shunt resistances and diode quality factor of a photovoltaic cell using the Lambert W-function

authors: Ghani, Faisal Abid

subjects: cell modelling

abstract: A number of methods currently exist to determine the modeling parameters of a solar cell. The authors presented in earlier a work a method to numerically determine the values of series and shunt resistance using the Lambert W-function at maximum power point primarily using data provided by the manufacturer. This method however assumes the diode constant value is known. An experimental investigation revealed that by setting the diode constant to unity as suggested in other work, a growing disparity between model output and experimental values would arise away from the maximum power point. To address this issue, a modification is proposed to the method of Ghani and Duke (2011) which permits the calculation of the diode constant and the corresponding values of series and shunt resistances. The method was experimentally validated by collecting the current-voltage characteristics of a multi-crystalline cell exposed to 800, 900, and 1000 W/m² of outdoor illumination in Hamilton, New Zealand. A comparative analysis of the model generated data using parameters found by the proposed method and two additional methods against experimental data revealed a significant reduction in the root mean square error over the entire current vector was obtained using the proposed method. The method is simple to apply and can be carried out using data provided the manufacturer.

text: Numerical calculation of series and shunt resistances and diode quality factor of a photovoltaic cell using the Lambert W-function A number of methods currently exist to determine the modeling parameters of a solar cell. The authors presented in earlier a work a method to numerically determine the values of series and shunt resistance using the Lambert W-function at maximum power point primarily using data provided by the manufacturer. This method however assumes the diode constant value is known. An experimental investigation revealed that by setting the diode constant to unity as suggested in other work, a growing disparity between model output and experimental values would arise away from the maximum power point. To address this issue, a modification is proposed to the method of Ghani and Duke (2011) which permits the calculation of the diode constant and the corresponding values of series and shunt resistances. The method was experimentally validated by collecting the current-voltage characteristics of a multi-crystalline cell exposed to 800, 900, and 1000 W/m² of outdoor illumination in Hamilton, New Zealand. A comparative analysis of the model generated data using parameters found by the proposed method and two additional methods against experimental data revealed a significant reduction in the root mean square error over the entire current vector was obtained using the proposed method. The method is simple to apply and can be carried out using data provided the manufacturer.

year: 2013

title: Henry V in 1972: Learning from Ngaio Marsh.

authors: Houlahan, Mark

abstract: Mark Houlahan University of Waikato Henry the Fifth in 1972: learning from Ngaio Marsh In the evening of October 1, 1972, the James Hay Theatre in the Christchurch Town Hall was officially launched with an impressively mounted production of Shakespeare’s Henry V, directed by Ngaio Marsh, internationally famous as one of the Queens of Crime fiction, and who had directed high quality Shakespeare productions in Ōtautahi/Christchuch since 1943. The production, using over 100 actors and featuring professional actors Marsh had trained who returned from England to perform, was a pinnacle of her production style, and each of the ten performances sold out. Marsh’s meticulously prepared promptbooks for the show, housed in the Turnbull Library, show every cut and move sketched by Marsh in advance. The Marsh archives also document reviewers’ reactions and recollections from the company, and contain a rich array of visual evidence: posters, production stills, and the official programme. In my paper I will use this data to evoke this lavish event. In 2019 the Town Hall re-opened after extensive restoration following the 2011 earthquakes, a process documented in The Christchurch Town Hall 1965-2019: a Dream Renewed (Canterbury UP, 2020); and the venue has begun presenting post-Covid entertainments. It is timely then to pivot back to 1972 and ask what we can learn from this production about the place of Marsh’s theatre in the development of performance culture in Aotearoa; and open out to the wider, ongoing questions as to the place of Shakespeare in our cultural fabric. Mark Houlahan is Associate Professor of English in Te Kura Toi (School of Arts), University of Waikato. He has published widely in Shakespeare Studies with a special focus on the afterlife of Shakespeare’s works in Aotearoa/New Zealand, as seen, for example, in his chapter: “From the Shakespeare Hut to the Pop-up Globe: Shakespeare, memory and New Zealand, 1916-2016”, in G. McMullan, P. Mead, A. G. Ferguson, M. Houlahan, & K. Flaherty (Eds.), Antipodal Shakespeare Remembering and Forgetting in Britain, Australia and New Zealand, 1916 - 2016 (pp. 117-144).

text: Henry V in 1972: Learning from Ngaio Marsh. Mark Houlahan University of Waikato Henry the Fifth in 1972: learning from Ngaio Marsh In the evening of October 1, 1972, the James Hay Theatre in the Christchurch Town Hall was officially launched with an impressively mounted production of Shakespeare’s Henry V, directed by Ngaio Marsh, internationally famous as one of the Queens of Crime fiction, and who had directed high quality Shakespeare productions in Ōtautahi/Christchuch since 1943. The production, using over 100 actors and featuring professional actors Marsh had trained who returned from England to perform, was a pinnacle of her production style, and each of the ten performances sold out. Marsh’s meticulously prepared promptbooks for the show, housed in the Turnbull Library, show every cut and move sketched by Marsh in advance. The Marsh archives also document reviewers’ reactions and recollections from the company, and contain a rich array of visual evidence: posters, production stills, and the official programme. In my paper I will use this data to evoke this lavish event. In 2019 the Town Hall re-opened after extensive restoration following the 2011 earthquakes, a process documented in The Christchurch Town Hall 1965-2019: a Dream Renewed (Canterbury UP, 2020); and the venue has begun presenting post-Covid entertainments. It is timely then to pivot back to 1972 and ask what we can learn from this production about the place of Marsh’s theatre in the development of performance culture in Aotearoa; and open out to the wider, ongoing questions as to the place of Shakespeare in our cultural fabric. Mark Houlahan is Associate Professor of English in Te Kura Toi (School of Arts), University of Waikato. He has published widely in Shakespeare Studies with a special focus on the afterlife of Shakespeare’s works in Aotearoa/New Zealand, as seen, for example, in his chapter: “From the Shakespeare Hut to the Pop-up Globe: Shakespeare, memory and New Zealand, 1916-2016”, in G. McMullan, P. Mead, A. G. Ferguson, M. Houlahan, & K. Flaherty (Eds.), Antipodal Shakespeare Remembering and Forgetting in Britain, Australia and New Zealand, 1916 - 2016 (pp. 117-144).

year: 2021

title: Working to End Racial Oppression: Project findings

authors: Waitoki, Moana

abstract: WERO webinar hosted by Māori and Indigenous Analysis Ltd & AATEA Solutions.

text: Working to End Racial Oppression: Project findings WERO webinar hosted by Māori and Indigenous Analysis Ltd & AATEA Solutions.

year: 2025