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Christchurch, New Zealand

Harris G.,CPIT | Muir L.,Safe Air | Pons D.,University of Canterbury
Proceedings of IEEE International Conference on Teaching, Assessment and Learning for Engineering: Learning for the Future Now, TALE 2014

Discussion of an Engineering Master's Thesis of a novel rotating engine along with a case study on the benefits of relationship of Engineering Industry with academia. © 2014 IEEE. Source

Bigwood T.,Institute of Environmental Science and Research ESR Ltd. | Bigwood T.,University of Canterbury | Hudson J.A.,Institute of Environmental Science and Research ESR Ltd. | Cooney J.,Institute of Environmental Science and Research ESR Ltd. | And 5 more authors.
Food Microbiology

Two bacterial isolates with inhibitory activity against Listeria monocytogenes and Enterococcus faecalis were obtained from soil. Genotypic and phenotypic characterization identified them as Enterococcus mundtii, a species whose ability to compete with L. monocytogenes is relatively unexplored compared to other members of the genus. The thermal stability of the inhibitory factor and its sensitivity to proteolytic enzymes indicate that it is most likely a bacteriocin. Both isolates grew at comparable rates to L. monocytogenes at 5 °C and 10 °C in vitro. One isolate killed L. monocytogenes when it reached concentrations of 106-108 CFU ml-1. Minimum inocula of 106 and 105 CFU ml-1 of E. mundtii were required to reduce and maintain L. monocytogenes concentrations beneath the level of detection at 5 °C and 10 °C, respectively. In situ experiments at 5 °C showed that E. mundtii inhibited the growth of L. monocytogenes on vacuum-packed cold smoked salmon during its four week shelf life. E. mundtii could, therefore, control the growth of L. monocytogenes at low temperatures, indicating a potential application in controlling this pathogen in chilled foods. To control growth of Listeria, the concentration of E. mundtii needs to be high, but it is possible that a purified bacteriocin could be used to achieve the same effect. © 2012 Elsevier Ltd. Source

Pears A.,Uppsala University | Clear A.,CPIT | Cassel L.,Villanova University | Cuadros-Vargas E.,San Pablo Catholic University | And 2 more authors.
ITICSE 2014 - Proceedings of the 2014 Innovation and Technology in Computer Science Education Conference

This year marks the 19th ITiCSE conference. This panel will provide conference delegates, both frequent attendees and those new to ITiCSE the opportunity to reect on the conference's success as one of the premier international com- puter science education conferences and to discuss potential future directions for the conference. Copyright © 2014 ACM. Source

Massie A.,CPIT | Watson N.R.,University of Canterbury
Bulletin of the New Zealand Society for Earthquake Engineering

This paper gives a brief summary of the performance of the electrical infrastructure in the earthquakes that struck Christchurch and surrounding regions in 2011, with particular reference to the 22 February 2011 earthquake which was the most devastating. Source

Cronje T.F.,CPIT | Gaynor P.T.,University of Canterbury
2013 Australasian Universities Power Engineering Conference, AUPEC 2013

This paper describes a novel design of a high voltage, high frequency, bipolar pulse generator, for experimental use in electrochemotherapy and irreversible electroporation, using RF MOSFETs (DE375-102N12A) in a cascaded multilevel inverter topology. Its pulsing regime is fully programmable and is con-trolled by an FPGA. A systematic development approach was followed. The UCC37321 gate driver and the HCPL-2400 opto-coupler were selected. Damping resistors and RCD snubbers were employed to mitigate excessive ringing in the output circuit. Practical EMC reduction guidelines were followed. The pulse generator operated satisfactorily, producing a typical cascaded 5-level output of 1250 V peak at 1 MHz into a load of 80 ohm in parallel with 235 pF. Higher room temperature caused a slight 'indent' into the output pulses. © 2013 Australasian Committee for Power Engineering (ACPE). Source

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