In this paper, alkali-activated fly ash (geopolymer) samples were microstructurally analysed after thermal shock. The prepared samples were heated at 1000 °C, and then quenched in water to room temperature. X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS) were used to analyse the samples. The colour of the interior and exterior section of samples were different, where the former was darker than the latter. XRD results showed that hematite forms in small quantities in both interior and exterior sections. EDS analyses showed the presence of iron-rich points in both sections; however, there were many accumulated iron points in the interior section. It was concluded that, to reduce free energy of the system, dissoluble iron during geopolymerisation diffuses through molten channels when geopolymer is being heated and forms accumulated iron regions.
Oxygen-selective mixed ionic-electronic conducting (MIEC) ceramic membrane technology enables clean coal combustion and membrane reactor for green chemical synthesis. To be practical in these applications that involve CO2 presence, the membrane materials should have simultaneously high CO2 resistance and oxygen permeation fluxes. This work probed these properties for the perovskite oxide family of La0.6X0.4FeO3-δ (X=Mg, Ca, Sr, or Ba), i.e., La0.6Mg0.4FeO3-δ (LMF), La0.6Ca0.4FeO3-δ (LCF), La0.6Sr0.4FeO3-δ (LSF), and La0.6Ba0.4FeO3-δ (LBF) in the hollow fiber membrane geometry that is highly suitable for industrial application. LCF hollow fiber displayed the best balance in CO2 resistance and oxygen permeation fluxes.
The Stephan's Quintet (hereafter SQ) is a template source to study the impact of galaxies interaction on the physical state and energetics of their gas. We report on IRAM single-dish CO observations of the SQ compact group of galaxies. These observations follow up the Spitzer discovery of bright mid-IR H2 rotational line emission (L(H2) ≈ 1035 W) from warm (102 - 3 K) molecular gas, associated with a 30 kpc long shock between a galaxy, NGC 7318b, and NGC 7319's tidal arm. We detect CO(1-0), (2-1) and (3-2) line emission in the inter-galactic medium (IGM) with complex profiles, spanning a velocity range of ≈1000 km s-1. The spectra exhibit the pre-shock recession velocities of the two colliding gas systems (5700 and 6700 km s-1), but also intermediate velocities. This shows that much of the molecular gas has formed out of diffuse gas accelerated by the galaxy-tidal arm collision. CO emission is also detected in a bridge feature that connects the shock to the Seyfert member of the group, NGC 7319, and in the no…
Literature-based discovery systems aim at discovering valuable latent connections between previously disparate research areas. This is achieved by analyzing the contents of their respective literatures with the help of various intelligent computational techniques. In this paper, we review the progress of literature-based discovery research, focusing on understanding their technical features and evaluating their performance. The present literature-based discovery techniques can be divided into two general approaches: the traditional approach and the emerging approach. The traditional approach, which dominate the current research landscape, comprises mainly of techniques that rely on utilizing lexical statistics, knowledge-based and visualization methods in order to address literature-based discovery problems. On the other hand, we have also observed the births of new trends and unprecedented paradigm shifts among the recently emerging literature-based discovery approach. These trends are likely to shape the fu…
Using taxation statistics, we first derive consistently defined Gini coefficients for the period 1942-2013 for Australia as a whole as well as its eight states and territories. While income inequality exhibited a downward trend until 1979, it has since been on the rise not only over time, but also across states and territories. We then proceed to examine the effect of inequality on economic growth after controlling for changes arising from investment in physical and human capital using available panel data across all states and territories (1986-2013). We find that inequality adversely affects economic growth with a couple of years delay, an outcome consistent with similar studies undertaken in the United States and Europe. Our findings suggest that policymakers can address rising income inequality by implementing measures that support, and enhance, human capital accumulation given its long-run economic and social benefits.
Over the past decade, anthologies – also called ‘readers’ – of design history and theory have proliferated across publishers’ catalogues. These books perform important pedagogical functions: they define fields and establish canons of authoritative texts, authors and concepts. While detractors argue that the easy availability of textual sources online means that we no longer need anthologies, the opposite argument can be made: the overwhelming volume of electronic information sharpens the need for concise, edited selections. This paper examines the practices of selecting, editing and publishing anthologies and the reasons for their increasing popularity, particularly in design education, at the present time.
Abstract not available.
Based on the structure of the nitrogenase FeMo cofactor (FeMoco), it is reported that Fe deposited on MoS2 2D sheets exhibits high selectivity towards the spontaneous fixation of N2 against chemisorption of CO2 and H2O. DFT predictions also indicate the ability of this material to convert N2 into NH3 with a maximum energy input of 1.02 eV as an activation barrier for the first proton–electron pair transfer.
Purpose: Fused deposition modeling (FDM) has become an increasingly important process among the available additive manufacturing technologies in various industries. Although there are many advantages of FDM process, a downside of its industrial application is the attainable dimensional accuracy with tight tolerance without compromising the mechanical performance. This paper aims to study the effects of six FDM operating parameters on two conflicting responses, namely dynamic stiffness and dimensional stability of FDM produced PC-ABS parts. This study also aims to determine the optimal process settings using graphical optimization that satisfy the dynamic mechanical properties without compromising the dimensional accuracy.
Design/methodology/approach: The regression models based upon IV-Optimal response surface methodology (RSM) are developed to study the variation of dimensional accuracy and dynamic mechanical properties with changes in process parameter settings. Statistical analysis was conducted to establi…
Clinical aggression is increasingly being recognised as an area of concern. In Victoria, health services are each responsible for ensuring workforce development strategies are in place for the prevention and management of clinical aggression and that staff are aware of these strategies and skilled in their application. The Department of Health and Human Services (DHHS) is undertaking a project to standardise approaches to training in the prevention and management of clinical aggression in mental health services (including emergency departments) in Victoria. This document is a step toward this intent by developing minimum training standards for preventing and managing clinical aggression including a practice model for physical restraint.