Research/Scholarly/Creative Works

• Ghildiyal V., van Herel R., Heffernan B. and Altaner C. (2022) The effect of Joule heating on collapse and water absorption of wood. Wood Material Science & Engineering : 9. http://dx.doi.org/10.1080/17480272.2022.2121660. (Journal Articles)

• Heffernan W., Allen M. and Mukhedkar R. (2022) Efficient electrification with Ga2O3 - a robust wide bandgap semiconductor. In. (Conference Contributions - Published)

• Mitchell B., Zhou Y., Hayes MP., Heffernan B., Platt I., Bailey J., Hunze A., Gao K., Long N. and Woodhead I. (2022) Non-Invasive Groundwater Velocity Measurements Using a Novel Electromagnetic Flowmeter. IEEE Transactions on Instrumentation and Measurement 71 http://dx.doi.org/10.1109/TIM.2022.3147322. (Journal Articles)

• Mitchell B., Hayes M. and Heffernan B. (2021) Modelling for an Electromagnetic Groundwater Flowmeter. In Proceedings of the IEEE Instrumentation and Measurement Technology Conference 2021-May http://dx.doi.org/10.1109/I2MTC50364.2021.9460074. (Conference Contributions - Published)

• Mora S., Seaton H., Subritzky S., Toms D., Lapthorn A. and Heffernan B. (2021) Static Characterisation of Gallium Nitride HEMTs at Cryogenic Temperatures. In IEEE Region 10 Annual International Conference, Proceedings/TENCON 2021-December: 953-957. http://dx.doi.org/10.1109/TENCON54134.2021.9707264. (Conference Contributions - Published)

• Wadsworth A., Pais B., Kyle S., Thrimawithana DJ., Badcock RA., Lapthorn A., Heffernan B., Oliver RA., Wallis DJ. and Neuberger M. (2021) Evaluating Common Electronic Components and GaN HEMTs under Cryogenic Conditions. In 2021 IEEE Southern Power Electronics Conference, SPEC 2021 http://dx.doi.org/10.1109/SPEC52827.2021.9709441. (Conference Contributions - Published)

• Heffernan B., Mitchell B. and Hayes M. (2020) Trapezoidal current generator for an electromagnetic groundwater flowmeter. In Proceedings of the International Instrumentation and Measurement Technology Conference, I2MTC 2020 http://dx.doi.org/10.1109/I2MTC43012.2020.9128643. (Conference Contributions - Published)

• Mitchell B., Hayes M. and Heffernan B. (2020) Nonlinear system identification for an electromagnetic groundwater flowmeter. In Proceedings of the International Instrumentation and Measurement Technology Conference, I2MTC 2020 http://dx.doi.org/10.1109/I2MTC43012.2020.9129522. (Conference Contributions - Published)

• Nursultanov N., Heffernan WJB., Altaner C. and Pang S. (2020) Anisotropic electrical conductivity of green timber within 20 - 90 ^∘C temperature range. Wood Science and Technology 54(5): 1181-1196. http://dx.doi.org/10.1007/s00226-020-01212-2. (Journal Articles)

• Hayes M., Mitchell B., Bonnett B., Frampton M. and Heffernan W. (2019) Tank-tests of a Prototype Electromagnetic Groundwater Flowmeter. In Proceedings of the 2019 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). (Conference Contributions - Published)

• Nursultanov N. and Heffernan WJB. (2019) Sapwood depth tool–proof of concept field prototype. In Sapwood depth tool – proof of concept field prototype, Specialty Wood Products (SWP). (Reports)

• Nursultanov N., Heffernan WJB., van Herel MJWMR. and Nijdam JJ. (2019) Computational calculation of temperature and electrical resistance to control Joule heating of green Pinus radiata logs. Applied Thermal Engineering 159 http://dx.doi.org/10.1016/j.applthermaleng.2019.113855. (Journal Articles)

• Pawson SM., Bader MKF., Brockerhoff EG., Heffernan WJB., Kerr JL. and O’Connor B. (2019) Quantifying the thermal tolerance of wood borers and bark beetles for the development of Joule heating as a novel phytosanitary treatment of pine logs. Journal of Pest Science 92(1): 157-171. http://dx.doi.org/10.1007/s10340-018-1015-8. (Journal Articles)

• Van Herel R., Heffernan W. and Wood A. (2019) Managing fuse protection in low-voltage networks with distributed generation.. (Reports)

• Heffernan WJB., Nursultanov N., van Herel R. and Smart T. (2018) Joule heating of logs for phytosanitary purposes and timber processing pre-treatment. Advanced Materials Letters 9(11): 767-775. http://dx.doi.org/10.5185/amlett.2018.2133. (Journal Articles)

• Nursultanov N. and Heffernan WJB. (2018) Specialty Wood Products (SWP) Technical Report. In Sapwood Depth Tool – Proof of Principle, Specialty Wood Products (SWP). (Reports)

• Van Herel MJWMR., Wood AR., Clapham K. and Heffernan WJB. (2018) Impact of inverter energy systems on fuse protection of low voltage networks. In. (Conference Contributions - Published)

• Hayes M., Mitchell B., Bonnett B. and Heffernan WJB. (2017) Preliminary results from an electromagnetic groundwater flow measurement system. In Proceedings of ENZCon2017. (Conference Contributions - Published)

• Heffernan WJB. (2017) The Use of Joule Heating as a Phytosanitary Treatment - A Potential Alternative to Methyl Bromide Fumigation. Rotorua, NZ: International Forest Quarantine Research Group Meeting 14 (IFQRG14), 2-6 Oct 2017. (Conference Contributions - Other)

• Heffernan WJB. (2017) The Use of Joule Heating as a Phytosanitary Treatment. Beijing, PRC: Administration of Quality Supervision, Inspection and Quarantine (of PRC) AQSIQ 2017 NZ/China bilateral meeting, 10 Apr 2017. (Conference Contributions - Other)

• Heffernan WJB. and Agger P. (2017) Electromagnetic shielding system for log Joule Heating machine. I devised the system (as per NZ Patent Application 730025) and built the CTs and electric circuit.: Power Electronics Laboratory. [Electromagnetic circuit]. (Artefacts, Objects, Craftworks)

• Heffernan WJB., Nursultanov N. and van Herel MJWMR. (2017) Wood Heating System and Method.Patent No. 730025, NZ. (Intellectual Property)

• Nursulantov N., Altaner CM. and Heffernan WJB. (2017) Effect of temperature on electrical conductivity of green sapwood of Pinus radiata (radiata pine). Wood Science and Technology 51(4): 795-809. http://dx.doi.org/10.1007/s00226-017-0917-6. (Journal Articles)

• Van Herel MJWMR. and Nursultanov N. (Ed.) (2017) Data processing and reporting suite for Joule Log Heating Project. Atlassian Bitbucket: EPECentre. (Software / Code)

• Wylie B. and Heffernan WJB. (2017) Joule log heating for phytosanitary treatment, commercial feasibility Front End Loading 1 Report. In Joule log heating FEL1 Report, Commissioned by Stakeholders in Methyl Bromide Reduction. 29. (Reports)

• Heffernan WJB., Chen P. and Mishra A. (2016) Small-scale PV Inverters - New equipment standards versus actual performance. In. (Conference Contributions - Published)

• Heffernan WJB., Healy D., Agger P., Nursultanov N. and Van Herel M. (2016) Log Joule-Heating rig (University of Canterbury high voltage lab). [Galvanised steel, mild steel, aluminium, thermoplastic sewer-pipe, open-cell foam, copper]. (Other)

• Heffernan WJB., Nursultanov N. and van Herel M. (Ed.) (2016) 1 Dimensional Electro-thermal model of Log undergoing Joule Heating. . (Software / Code)

• Heffernan WJB., van Herel M., Nursultanov N. and Smart T. (2016) Practical Joule Heating for Phytosanitary Log Treatment. In. (Conference Contributions - Published)

• Heffernan WJB. and Villa E. (2015) Electro-Magnetic Scanner. I invented the concept, made and tested initial prototypes and designed the finished version.: Commissioned by N/A. Power Electronics Laboratory. 2-2 Feb 2015. [Electronic Sensing and Signal Processing Equipment]. (Artefacts, Objects, Craftworks)

• Heffernan WJB., Healy D., Villa E. and Agger P. (2015) Smart Electrode System for Joule Heating of Logs, incorporating electromagnetic shielding system for log Joule heating machine. I conceived and designed the system, built the CTs and bread-boarded and tested the electronics.: UC HV Laboratory. [Electro-mechanical / electronic assembly / electromagnetic circuit]. (Artefacts, Objects, Craftworks)

• Heffernan WJB., Watson NR. and Watson JD. (2014) Heat-pump performance: voltage dip/sag, under-voltage and over-voltage. The Journal of Engineering 14(12): 640-657. http://dx.doi.org/10.1049/joe.2014.0180. (Journal Articles)

• Heffernan WJB. (2013) Proof of Concept Studies for the Practical Application of Joule Heating as a Phytosanitary Treatment for Export Pinus radiata (D. Don) Logs.Commissioned by Stakeholders in Methyl Bromide Reduction (STIMBR) Primary Growth Partnership (PGP). 44pp. (Reports)

• Heffernan WJB. (2013) Practical Application of Joule Heating to the Sterilization of Plantation Grown Pinus radiata Logs. In. (Conference Contributions - Published)

• Heffernan WJB., Watson NR., Buehler R. and Watson JD. (2013) Harmonic performance of heat-pumps. The Journal of Engineering 2013(9): 31-44. http://dx.doi.org/10.1049/joe.2013.0012. (Journal Articles)

• Heffernan WJB. (2012) Health and Safety Aspects of Electricity Smart Meters - A Study into the potential health effects of Radio Frequency emissions from Smart Meters. In (N.B. This report also resulted in a magazine article, co-authored with Allan Miller, in the journal Metering International, entitled "Health and safety aspects of smart meters": Metering international, 2012, Issue 3, pp. 146 - 148), Commissioned by Arc Innovations Limited. 18. (Reports)

• Miller A. and Heffernan B. (2012) Health and safety aspects of electricity smart meters. Metering International 2012(3): 146-148. [Magazine Article]. (Other)

• Shillington R., Gaynor P., Harrison M. and Heffernan W. (2012) Silicon carbide JFET reverse conduction characteristics and use in power converters. IET Power Electronics 5(8): 1282-1290. http://dx.doi.org/10.1049/iet-pel.2011.0404. (Journal Articles)

• Heffernan WJB. (2011) LED lighting system with dynamic spectrum control, data transmission and integrated battery backup.Patent No. 593803. (Intellectual Property)

• Heffernan WJB., Tough LA., Hardie SR., Bodger PS. and Lawrence J. (2011) Joule heating apparatus and associated controller and instrumentation for electrical sterilization of export logs. High Voltage laboratory, Department of Electrical and Computer Engineering. [Proof of concept electrical & mechanical apparatus]. (Artefacts, Objects, Craftworks)

• Heffernan WJB., Umar R., Fisher O., Frater LP., Lapthorn A. and McInnes A. (2011) Spectradyne LED lighting system with dynamic spectrum control, data transmission capability and integrated battery backup. Concept devised and developed in-house, but supported by FRST under PSAF. EPECentre/Department of Electrical and Computer Engineering. [Fully functional prototype electronic system]. (Artefacts, Objects, Craftworks)

• Hardie SR. and Heffernan B. (2010) Energy survey for NZ Post.New Zealand Post Limited. Commissioned by New Zealand Post Limited. 25pp. (Reports)

• Hardie SR. and Heffernan B. (2010) Testing of Zapcatcher Power and Data Power Filter.Commissioned by Office of the Electricity and Gas Complaints Commissioner. 5pp. (Reports)

• Heffernan B., Duke R., Zhang R., Gaynor P. and Cusdin M. (2010) A Go-cart as an Electric Vehicle for Undergraduate Teaching and Assessment. In. (Conference Contributions - Published)

• Heffernan B., Frater L. and Watson N. (2010) LED lighting for industrial, commercial and institutional premises, part 2. Industrial Electrix Jan-Mar 2010: 48-50. [Magazine Article]. (Other)

• Heffernan WJB. (2010) Advanced Fabrication of Integrated Motor Drives - an investigation into the use of unpackaged power semiconductors in a fan motor controller for Wellington Drives.Wellington Drive Technologies Limited. Commissioned by Wellington Drive Technologies Limited. 37pp. (Reports)

• Schinkelshoek M., Watson N. and Heffernan B. (2010) The characteristics of CFLs: Beyond the harmonics. In Proceedings of the 20th Australasian Universities Power Engineering Conference (AUPEC 2010). (Conference Contributions - Published)

• Shillington R., Gaynor P., Harrison M. and Heffernan B. (2010) Applications of Silicon Carbide JFETs in Power Converters. In. (Conference Contributions - Published)

• Watson NR., Hardie S., Lawrence J., Heffernan B., Scott T. and Hirsch S. (2010) Power Quality Management in New Zealand. In Proceeding of the CIGRE Session 2010. (Conference Contributions - Published)

• Heffernan B. and Lawrence J. (2009) Joule Heating of Export Logs: An Investigation of Joule heating of Pinus radiata export logs as an alternative to Methyl Bromide fumigation. Stage I Final Report (0810757).Commissioned by MAF Biosecurity NZ. 49pp. (Reports)

• Heffernan B., Frater L. and Watson N. (2009) LED lighting for industrial, commercial and institutional premises, part 1. Industrial Electrix Oct-Nov 2009: 17-19. [Magazine Article]. (Other)

• Heffernan B., Love G. and Pahalawaththa N. (2009) Heat Pump Power Quality, Harmonics and Power Factor. Christchurch, New Zealand: EPECentre PQ Conference 2009: Power Quality in Future Electrical Networks, 23-24 Apr 2009. (Conference Contributions - Other)

• Heffernan WJ. (2009) Trolley-Bus Motor Report.ELMG Limited. Commissioned by ELMG LImited. 14pp. (Reports)

• Heffernan WJB. (2009) Electric Go Cart Motor Drive Power Module and Controller. Department of Electrical and Computer Engineering. [Electric vehicle drive for undergraduate teaching]. (Artefacts, Objects, Craftworks)

• Heffernan WJB. and Hardie SR. (2009) Electric vehicle charging technologies, charging regimes and the effects on electricity networks.Commissioned by Centre for Advanced Engineering (CAENZ). 7pp. (Reports)

• Heffernan WJB. (2008) Findings regarding AgResearch LED "UFO" Growing Lamp.Commissioned by AgResearch. 4pp. (Reports)

• Heffernan WJB., Frater LP. and Watson NR. (2008) LED Lighting for Industrial, Commercial and Institutional Premises. In. (Conference Contributions - Published)

• Heffernan WJB., Lawrence J. and Watson NR. (2008) Investigation into Heat Pump Power Quality, Undervoltage and Transient Operation.Transpower. Commissioned by Transpower. 66pp. (Reports)

• Heffernan WJB., Frater LP. and Watson NR. (2007) LED replacement for fluorescent tube lighting. In Proceedings of the Australasian Universities Power Engineering Conference (AUPEC) 2007: 6pp. http://dx.doi.org/10.1109/AUPEC.2007.4548064. (Conference Contributions - Published)

• Evans PD. and Heffernan WJB. (2001) Electromagnetic considerations in power electronic converters. Proceedings of the IEEE 89(6): 864-875. http://dx.doi.org/10.1109/5.931478. (Journal Articles)

• Evans PD. and Heffernan WJB. (1995) Transformer for Multimegahertz Power Applications. IEE Proceedings on Electrical Power Applications 142(6): 379-389. http://dx.doi.org/10.1049/ip-epa:19952040. (Journal Articles)

• Evans PD. and Heffernan WJB. (1995) Multi megahertz transformers. In Thirtieth IAS Annual Meeting, IAS '95., Conference Record of the 1995 IEEE 1: 824-832. http://dx.doi.org/10.1109/IAS.1995.530384. (Conference Contributions - Published)

• Heffernan WJB. (1995) Off-line resonant power supplies. In IEE Colloquium (Digest)(13). (Conference Contributions - Published)

• Heffernan WJB. and Evans PD. (1992) Comparative Assessment of Zero Voltage Switched Off-Line Power Converter Topologies. IEE Proceedings B 139(2): 71-85. (Journal Articles)

• Chew WM., Evans PD. and Heffernan WJ. (1991) High frequency inductor design concepts. In PESC Record - IEEE Power Electronics Specialists Conference: 673-678. (Conference Contributions - Published)

• Heffernan WJB. and Evans PD. (1991) High frequency zero voltage switched off-line power converters. In. (Conference Contributions - Published)

• Heffernan WJB., Evans PD., Thompson M. and Robert P. (1990) Three-phase parallel loaded resonant converter with fixed frequency operation. In IEE Conference Publication(324): 115-120. (Conference Contributions - Published)

• HEFFERNAN WJB., EVANS PD., THOMPSON M., ROBERT P. and ENGINEERS IE. (1990) 3 PHASE PARALLEL LOADED RESONANT CONVERTER WITH FIXED FREQUENCY OPERATION. In FOURTH INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND VARIABLE-SPEED DRIVES 324: 115-120. (Conference Contributions - Published)

• Heffernan WJB. and Evans PD. (1989) Practical comparison of high frequency off-line power converter topologies. In PESC Record - IEEE Annual Power Electronics Specialists Conference 2: 979-986. (Conference Contributions - Published)

Student Supervision

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Current
• PhD - McGill E: High fidelity voltage dependent load flow for the assessment of steady state voltage control technologies in low voltage distribution networks with high photovoltaic penetration
• PhD - Mitchell BG: Groundwater flow measurement using electromagnetic fields
• PhD - Nursultanov N: Joule heating of Pinus radiata logs for phytosanitary purposes: An in-depth investigation by experimentation and computational modelling. (2016)
• PhD - Smart T: Determining the Distribution of Power Dissipation and Conductivity During Joule Heating of Pinus radiata Logs (2018)
Completed
• Masters - Fischer S: Dependence on Wood Properties of Log Sterilization by Joule Heating (2014)

Review and Refereeing

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• Journal of Power Electronics ( 2009 - 2023)

Research Groups