Effect of the degree of crystallinity on the electrochemical behavior of Mg65Cu25Y10 and Mg70Zn25Ca5 bulk metallic glasses

The effect of varying the percent crystallinity on the electrochemical behavior of Mg65Cu25Y10 and Mg70Zn25Ca5 bulk metallic glasses was studied. The alloys were heat-treated to achieve desired microstructures ranging from fully amorphous to fully crystalline, providing a systematic basis for subsequent testing. Potentiodynamic experiments in 0.01 M sodium chloride (NaCl) were used, whereby both the amorphous and partially crystallized samples were observed to have more noble corrosion potentials and lower anodic kinetics. However, this was accompanied by more rapid cathodic kinetics relative to their fully crystalline counterparts, meaning that corrosion rates were not significantly lower in the amorphous state. To describe the electrochemical response as a function of the degree of crystallinity, differential scanning calorimetry (DSC), scanning electron microscopy, x-ray diffraction (XRD), and electrical conductivity measurements were undertaken, where it was found that crystallinity alone is not necessarily the controlling factor and microchemistry that evolves upon devitrification, plays a key role in the electrochemical response of these materials.

Tentatively exploring the learning potentialities of postgraduate distance learners’ interactions with other people in their life contexts

Despite much discussion about the various modes of interaction that are possible within distance education, little attention has been paid to the interactions that occur between distance learners and other people in their life contexts about the academic content of their studies. This paper presents some preliminary findings from a study exploring this topic through the eyes of distance learners enrolled in Australian postgraduate coursework programs. It includes a categorisation of these interactions and the forms of learning they produce as well as a discussion of the potential implications for distance education theory and design.

An algorithm for determination of rank and degree of contribution of sMRI volumetric features in depression detection

Brain volume changes at structural level appear to have utmost importance in depression biomarkers studies. However, these brain volumetric findings have very minimal utilization in depression detection studies at individual level. Thus, this paper presents an evaluation of volumetric features to identify the relevant/optimal features for the detection of depression. An algorithm is presented for determination of rank and degree of contribution (DoC) of structural magnetic resonance imaging (sMRI) volumetric features. The algorithm is based on the frequencies of each feature contribution toward the desired accuracy limit. Forty-four volumetric features from various brain regions were adopted for evaluation. From DoC analysis, the DoC of each volumetric feature for depression detection is calculated and the features that dominate the contribution are determined.

Pathway from vocational education and associate degree to higher education: Chinese international students in Australia

Understanding factors influencing international students' decision to engage in international education is essential for education providers to better cater for students' educational expectations and enhance their attractiveness to international students. Whilst there has been extensive research on the reasons why international students undertake cross-border higher education, international students' motivations for enrolling in vocational education and associate degree programmes are still under-researched. Drawing on semi-structured interviews with 30 international students from China, this research found that pathway to higher education appears to be the most important factor motivating international students to undertake vocational education and associate degree programmes. In addition, prospect of immigration, English language proficiency, previous academic performance, agent's recommendations and relatives' and friends' advice are amongst the important factors that students take into account in their decision to choose vocational education and associate degree programmes. This research also examines why Chinese international students have chosen vocational education programmes in a dual-sector university over vocational education colleges. It found that the flexibility to articulate to higher education, international reputation of the programme, practical training and favourable location are key issues that these students draw on when making their decision to study in a dual-sector university.

Use and perceptions of worked example videos for first-year students studying mathematics in a primary education degree

Worked example videos have great potential to be useful for students when learning mathematics as they can work through the questions at their own pace, pausing as needed, but still learn from the way the demonstrator thinks and solves problems. We created worked example videos each week for a mathematics subject taught in the first year of a primary education degree and investigated student perceptions and their usage patterns. An additional aspect of this undertaking was the inclusion of subtitles to make the videos accessible to hearing impaired and ESL students. This report will reflect on the process of creating these videos, as well as some initial findings on their success.