‘XYZ’ application as a tool for teaching and learning in institutions of higher learning: an exploratory study

Teaching and learning in institutions of higher learning has undergone transformation as a result of rapid development in the field of communication and technologies. The emergence of social networking sites has paved the way for the enhancement of teaching and learning approaches. The focus of this study is on ‘XYZ’ application (the actual name is not disclosed due to confidentiality) that was recently launched in Malaysia. Using a mixed research method, the study investigated the perceptions of undergraduate students in a public university to identify the viability of this application in comparison with other applications and to analyze its effectiveness as a tool for teaching and learning. The findings indicate the application has good features that enhance the effectiveness of the teaching and learning process. However, there is concern about the limited compatibility of this application. The paper ends with recommendations on how the application can be improved

Geochemical, mineralogical and toxicological characteristics of coal fly ash and its environmental impacts

Coal and coal-based products (by-products), along with other fossil fuels should be used with caution because of their impact on human health and the global climate. In the light of the environmental impact these fossil fuels cause, it's essential to understand the elemental configuration of coal-derived samples and their impact on the ecosystem. Some reports in past have described, geochemical and mineralogical physiognomies of fly-ash and their impact on the environment. However, a comprehensive investigation of various aspects of fly ash like geochemistry, mineralogy, morphology, and toxicological effects has been very sparse and the present study reports the above aspects. The ICP-OES studies confirm the presence of various elements (Al, Ca, Fe, Mg, Na, P, S, Si, and Ti) in the samples. The XRD analysis exposed the presence of minerals like Quartz, H-Hematite, Anatase, Muscovite, and Rutile, in addition to the various phases such as amorphous and crystalline in the fly-ash. Specific samples also possessed Ilmenite which is uncommon in many other samples. Chromium and lead, the well-known heavy metals to cause soil and water pollution in the neighbourhood were found to be existing in higher concentrations in the fly-ash samples, whereas cadmium was found to be the least among the toxic elements found in the samples. The samples were subjected to FE-SEM analysis, which reveals the presence of irregularly shaped minerals and unburnt carbon known to reduce the burning efficiency of coal, especially in power plants. Toxicology studies reported in the work suggested that fly-ash is toxic to the environment at higher concentrations than at lower concentrations