title: Stratigraphy and chronology of late Quaternary tephras in Lake Maratoto, Hamilton, New Zealand

authors: Lowe, David J.

abstract: A 3 m piston core from Lake Maratoto (37°53’S 175°18’E) near Hamilton shows at least 12 thin, well-preserved distal airfall tephras intercalated with humic copropel (dy) deposits. Most of the tephras have been identified by their dominant ferromagnesian mineralogy, their stratigraphic position, and 5 radiocarbon dates. The majority of the tephras are derived from the Taupo and Okataina Volcanic Centres, while others originate from Mayor Island, Tongariro, and possibly Mount Egmont sources. The tephras dated (Libby ages) are: Taupo Pumice (Wk215) 1730 ± 60 years B.P., Tuhua Tephra (Wk214) 6210 ± 70 years B.P., Mangamate Tephra (Wk213) 10 120 ± 100 years B.P., and Rerewhakaaitu Ash (2 dates) (Wk237) 14 700 ± 220 years B.P. and (Wk238) 14 700 ± 180 years B.P. The identification of the tephras in Lake Maratoto extends the previously mapped distribution of North Island post-glacial (Holocene) tephras, and complements studies of soil genesis and weathering in the Waikato region. The core also provides a geochronological basis for further multidisciplinary studies of the paleolimnology, paleoclimate, and sedimentological history of the region.

text: Stratigraphy and chronology of late Quaternary tephras in Lake Maratoto, Hamilton, New Zealand A 3 m piston core from Lake Maratoto (37°53’S 175°18’E) near Hamilton shows at least 12 thin, well-preserved distal airfall tephras intercalated with humic copropel (dy) deposits. Most of the tephras have been identified by their dominant ferromagnesian mineralogy, their stratigraphic position, and 5 radiocarbon dates. The majority of the tephras are derived from the Taupo and Okataina Volcanic Centres, while others originate from Mayor Island, Tongariro, and possibly Mount Egmont sources. The tephras dated (Libby ages) are: Taupo Pumice (Wk215) 1730 ± 60 years B.P., Tuhua Tephra (Wk214) 6210 ± 70 years B.P., Mangamate Tephra (Wk213) 10 120 ± 100 years B.P., and Rerewhakaaitu Ash (2 dates) (Wk237) 14 700 ± 220 years B.P. and (Wk238) 14 700 ± 180 years B.P. The identification of the tephras in Lake Maratoto extends the previously mapped distribution of North Island post-glacial (Holocene) tephras, and complements studies of soil genesis and weathering in the Waikato region. The core also provides a geochronological basis for further multidisciplinary studies of the paleolimnology, paleoclimate, and sedimentological history of the region.

year: 1980-01-01

title: On square values of the product of the Euler totient and sum of divisors functions

authors: Broughan, Kevin A.

subjects: Euler function

abstract: If n is a positive integer such that ϕ(n)σ(n) = m² for some positive integer m, then m≤n. We put m = n - a and we study the positive integers a arising in this way.

text: On square values of the product of the Euler totient and sum of divisors functions If n is a positive integer such that ϕ(n)σ(n) = m² for some positive integer m, then m≤n. We put m = n - a and we study the positive integers a arising in this way.

year: 2012

title: To act or not to act? That is the question!

authors: Bruce Ferguson, Pip

abstract: The year was 2003. I was a new Research Manager working in a Māori tertiary institution that had a history of inequitable treatment by government, through not receiving establishment funding that had gone unproblematically to non-Māori institutions. Repeating a common pattern in New Zealand, our government had decided to implement a research funding scheme, to be measured at the level of the individual academic. My institution’s decision to participate in the PBRF was not without its difficulties, and it is here that the ethics of participation become problematic. This chapter is about our ability to articulate our values, to show how we work these out in our practice, and how we are accountable to ourselves and others for that practice. Would I, with the benefit of hindsight, have encouraged my institution to enter the PBRF again?

text: To act or not to act? That is the question! The year was 2003. I was a new Research Manager working in a Māori tertiary institution that had a history of inequitable treatment by government, through not receiving establishment funding that had gone unproblematically to non-Māori institutions. Repeating a common pattern in New Zealand, our government had decided to implement a research funding scheme, to be measured at the level of the individual academic. My institution’s decision to participate in the PBRF was not without its difficulties, and it is here that the ethics of participation become problematic. This chapter is about our ability to articulate our values, to show how we work these out in our practice, and how we are accountable to ourselves and others for that practice. Would I, with the benefit of hindsight, have encouraged my institution to enter the PBRF again?

year: 2013