Browsing by Author "Wang, G"

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    PublicationOpen Access
    Accelerated membrane durability testing of heavy duty fuel cells
    (IOP Publishing, 2014-11-19) Macauley, N; Alavijeh, A. S; Watson, M; Kolodziej, J; Lauritzen, M; Knights, S; Wang, G; Kjeang, E
    Regular durability testing of heavy duty fuel cell systems for transit bus application requires several thousand hours of operation, which is costly and time consuming. Alternatively, accelerated durability tests are able to generate failure modes observed in field operation in a compressed time period, by applying enhanced levels of stress. The objective of the present work is to design and validate an accelerated membrane durability test (AMDT) for heavy duty fuel cells under bus related conditions. The proposed AMDT generates bus relevant membrane failure modes in a few hundred hours, which is more than an order of magnitude faster than for regular duty cycle testing. Elevated voltage, temperature, and oxidant levels are used to accelerate membrane chemical stress, while relative humidity (RH) cycling is used to induce mechanical stress. RH cycling is found to significantly reduce membrane life-time compared to constant RH conditions. The role of a platinum band in the membrane is investigated and membranes with Pt bands demonstrate a considerable life-time extension under AMDT conditions, with minimal membrane degradation. Overall, this research serves to establish a benchmark AMDT that can rapidly and reliably evaluate membrane stability under simulated heavy duty fuel cell conditions.
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    PublicationOpen Access
    Translation and Psychometric Evaluation of the Difficulties in Emotion Regulation Scale-Short Form among Sri Lankans
    (School of Psychology. Faculty of Humanities and Sciences, SLIIT, 2025-10-10) Weerasinghe, S. A; Goh, Y; Izadikah, Z; Wang, G; Ireland, M. J
    The Difficulties in Emotion Regulation Scale-Short Form (DERS-SF) is a widely used measure to assess six areas of difficulties in emotion regulation. However, the psychometric properties of the scale have not been evaluated in the Sri Lankan population. This study aimed to evaluate the psychometric properties, specifically the reliability and factor structure of the scale, to establish relevance to Sinhalesespeaking Sri Lankans. Following the translation, data was gathered online from a convenience sample of 101 participants. The DERS-SF showed excellent reliability (Cronbach’s α = .93; Omega Total ωT = .93). A confirmatory factor analysis revealed that a five-factor structure excluding the awareness subscale had be_er fit indices, reflecting cultural differences in how emotion regulation difficulties are conceptualised. This structure appeared more suitable for use in future research and screening for emotion regulation difficulties in the Sri Lankan population. Additionally, high scores of the DERS-SF,particularly among the younger participants compared to the older participants, underscored the need for programs to teach strategies of emotion regulation.