Curtin University

About: Curtin University is a education organization based out in Perth, Western Australia, Australia. It is known for research contribution in the topics: Population & Zircon. The organization has 14257 authors who have published 48997 publications receiving 1336531 citations. The organization is also known as: WAIT & Western Australian Institute of Technology.

Enhancing Electrocatalytic Activity for Hydrogen Evolution by Strongly Coupled Molybdenum Nitride@Nitrogen-Doped Carbon Porous Nano-Octahedrons

Abstract: Developing highly efficient and affordable noble-metal-free catalysts toward the hydrogen evolution reaction (HER) is an important step toward the economical production of hydrogen. As a nonprecious-metal catalyst for the HER, molybdenum nitride (MoN) has excellent corrosion resistance and high electrical conductivity, but its catalytic activity is still inadequate. Here we report our findings in dramatically enhancing the HER activity of MoN by creating porous MoN@nitrogen-doped carbon (MoN-NC) nano-octahedrons derived from metal–organic frameworks (MOFs). The composite catalyst displays remarkably high catalytic activity, demonstrating a low overpotential of 62 mV at a current density of 10 mA cm–2 (η10), a small Tafel slope of 54 mV dec–1, and a large exchange current density of 0.778 mA cm–2 while maintaining good stability. The enhancement in catalytic properties is attributed to the unique nanostructure of the MoN, the high porosity of the electrode, and the synergistic effect between the MoN and th...

Waist–hip ratio is the dominant risk factor predicting cardiovascular death in Australia

Abstract: Objective To evaluate clinical measures of obesity for their ability to predict death from cardiovascular disease (CVD) and coronary heart disease (CHD), in parallel with conventional cardiovascular risk factors. Design, participants and setting Cross-sectional analysis of an age- and sex-stratified sample of 9206 adults aged 20-69 years from Australian capital cities (1989 Australian Risk Factor Prevalence Survey). Blood pressure, fasting serum lipid levels, smoking, history of heart disease or diabetes, and obesity as measured by body mass index (BMI), waist circumference and waist-hip ratio were recorded. These data were linked with the National Death Index to determine causes of death of the 473 survey subjects who had died to 31 December 2000. Main outcome measures Hazard ratios for the risk factors predicting CVD mortality and CHD mortality. Results Of the modifiable risk factors, obesity, as measured by waist-hip ratio, is a dominant, independent, predictive variable for CVD and CHD deaths in Australian men and women. Self-reported angina/myocardial infarction in both sexes, and cigarette smoking in women, are also independent risk factors. Conclusions Obesity assessed by waist-hip ratio is a better predictor of CVD and CHD mortality than waist circumference, which, in turn, is a better predictor than BMI. The recognition of central obesity is clinically important, as lifestyle intervention is likely to provide significant health benefits.

The impact of a classroom intervention on grade 10 students' argumentation skills, informal reasoning, and conceptual understanding of science

Abstract: The literature provides confounding information with regard to questions about whether students in high school can engage in meaningful argumentation about socio-scientific issues and whether this process improves their conceptual understanding of science. The purpose of this research was to explore the impact of classroom-based argumentation on high school students' argumentation skills, informal reasoning, and conceptual understanding of genetics. The research was conducted as a case study in one school with an embedded quasi-experimental design with two Grade 10 classes (n = 46) forming the argumentation group and two Grade 10 classes (n = 46) forming the comparison group. The teacher of the argumentation group participated in professional learning and explicitly taught argumentation skills to the students in his classes during one, 50-minute lesson and involved them in whole-class argumentation about socio-scientific issues in a further two lessons. Data were generated through a detailed, written pre- and post-instruction student survey. The findings showed that the argumentation group, but not the comparison group, improved significantly in the complexity and quality of their arguments and gave more explanations showing rational informal reasoning. Both groups improved significantly in their genetics understanding, but the improvement of the argumentation group was significantly better than the comparison group. The importance of the findings are that after only a short intervention of three lessons, improvements in the structure and complexity of students' arguments, the degree of rational informal reasoning, and students' conceptual understanding of science can occur. © 2010 Wiley Periodicals, Inc. J Res Sci Teach 47: 952–977, 2010

INTSERVQUAL – an internal adaptation of the GAP model in a large service organisation

Abstract: Explores the extent to which the construct service quality plays in an internal marketing setting. A conceptual model known as the “Internal Service Quality Model” was designed based on the original “GAP Model” developed by Parasuraman. The model evaluated the dimensions, and their relationships, that determine service quality among internal customers (front‐line staff) and internal suppliers (support staff) within a large service organisation, namely, Singapore Airlines. The dependent variable in this study was internal service quality (ISQ), while the independent variables were tangibility, reliability, responsiveness, assurance, and empathy. The results suggest that the perceptions and expectations of internal customers and internal suppliers play a major role in recognising the level of internal service quality perceived. The acceptance of the postulated hypotheses has confirmed the importance of the internal service quality construct, thus acknowledging the usefulness of the INTSERVQUAL instrument and the conceptualised Internal Service Quality Model proposed in this research study.