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29 results on '"Quinn, R.J."'

4. Zircon U-Pb geochronology and Nd-Pb isotope geochemistry of Blue Ridge basement in the eastern Great Smoky Mountains, U.S.A.: Implications for the Proterozoic tectonic evolution of the southeastern Laurentian margin

Author

Moecher, D.P., primary, Harris, F.C., additional, Larkin, E.A., additional, Quinn, R.J., additional, Walsh, K.B., additional, Loughry, D.F., additional, Anderson, E.D., additional, Samson, S.D., additional, Satkoski, A.M., additional, and Tohver, E., additional

Published
2020
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5. Suppression of thermal conductivity without impeding electron mobility in n-type XNiSn half-Heusler thermoelectrics

Author

Barczak, S.A., Quinn, R.J., Halpin, J.E., Domosud, K., Smith, R.I., Baker, A.R., Don, E., Forbes, I., Refson, K., MacLaren, D.A., and Bos, J.W.G.

Abstract

We outline a strategy to improve the thermoelectric performance of n-type XNiSn based half-Heusler alloys through Cu doping into vacant tetrahedral sites. A comprehensive combination of structural characterisation and modelling is employed to discriminate the competing mechanisms for thermoelectric enhancement. During synthesis a mineralising effect occurs that improves the homogeneity of the alloying elements Ti, Zr and Hf, and promotes grain growth, leading to a doubling of the electron mobility. In the formed materials, Cu is a strong n-type dopant, like Sb, but occupies the interstitial site and strongly enhances phonon scattering without diminishing carrier mobility (in contrast to interstitial Ni). Simultaneous alloying with Ti, Zr and Hf serves to minimise the thermal conductivity via regular mass disorder and strain effects. A best electronic power factor, S2/ρ, of 3.6 mW m−1 K−2 and maximum ZT of 0.8 at 773 K were observed for a Ti0.5Zr0.25Hf0.25NiCu0.025Sn composition, enabling promising device power densities of ∼6 W cm−2 and ∼8% conversion efficiency from a 450 K gradient. These findings are important because they provide new insight into the mechanisms underpinning high ZT in the XNiSn system and indicate a direction for further improvements in thermoelectric performance.

Published
2019

13. Anticancer Activity of Zoanthids and the Associated Toxin, Palytoxin, against Ehrlich Ascites Tumor and P-388 Lymphocytic Leukemia in Mice

Author

Quinn, R.J., Moore, Richard E., Kashiwagi, Midori, and Norton, Ted R.

Abstract

Crude alcoholic extracts of zoanthids, indigenous to Hawaii, have been shown to have general antitumor activity against Ehrlich ascites tumor in mice. The toxic component, palytoxin, was effective in the control and cure of Ehrlich ascites at extremely low dosages using several different methods of administration and displayed marginal activity against P-388 lymphocytic leukemia.

Published
1974
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