I wish I could believe you: the frustrating unreliability of some assessment research

Many practitioner researchers strive to understand which assessment practices have the best impact on learning, but in authentic educational settings, it can be difficult to determine whether one intervention, for example the introduction of an online quiz to a course studied by diverse students, is responsible for the observed effect. This paper uses examples to highlight some of the difficulties inherent in assessment research and suggests some ways to overcome them. Problems observed in the literature include: assuming that if two effects are correlated then one must have caused the other; confounding variables obscuring the true relationships; experimental approaches that are too far removed from reality; and the danger that self-reported behaviour and opinion is sometimes different from student’s actual behaviour. Practical solutions include: the use of an experimental or pseudo-experimental approach; the use of mixed methods; and the use of meta-analysis

Mobile moralities: ethical consumption in the digital realm

Ethical consumption, as a realm of production and exchange, as a framework for purchasing decisions and as political activism, is now well established in a range of nations. As a politics, it points to an interconnected but divergent set of concerns centred on issues of environmental sustainability, local and global economic and social justice, and community and individual wellbeing. While the subject of sustained critique, not least because of its apparent privileging of ‘the consumer’ as the locus of change, ethical consumption has garnered increasing attention. This is most recently evident in the development and widening use of ‘ethical consumption apps’ for mobile devices. These apps allow the user to both access ethical information on products and, potentially, to connect with a broader politics of consumption. However, in entering the digital realm ethical consumption also becomes embroiled in the complexities of digital technocultures and their ability to allow users of apps to be connected to each other, potentially building communities of interest and/or activism. This paper explores this emerging intersection of the ethical and the digital. It examines, in particular, whether such digital affordances affect the way ethical consumption itself may be conceived and pursued. Does the ethical consumption app work to collectivise or individualise, help to focus or fragment, speak of timidity or potential in relation to an oppositional politics of consumption? In confronting these issues, this paper suggests that contemporary ethical consumption apps – while full of political potential – remain problematic in that the turn to the digital has tended, so far, to accentuate the already individualising tendencies within a politics of ethical consumption. This speaks also, however, to a similar problematic in the politics of digital technocultures; the use of the digital does not automatically enable - merely through greater connectivity and information availability – forms of radical politics

Jet-edge interaction tones

Motivated by the problem of jet-flap interaction noise, we study the tonal dynamics that occur when a sharp edge is placed in the hydrodynamic nearfield of an isothermal turbulent jet. We perform hydrodynamic and acoustic pressure measurements in order to characterise the tones as a function of Mach number and streamwise edge position. The distribution of spectral peaks observed, as a function of Mach number, cannot be explained using the usual edge-tone scenario, in which resonance is underpinned by coupling between downstream-travelling Kelvin-Helmholtz wavepackets and upstream-travelling sound waves. We show, rather, that the strongest tones are due to coupling between the former and upstream-travelling jet modes recently studied by Towne et al. (2017) and Schmidt et al. (2017). We also study the band-limited nature of the resonance, showing a high-frequency cut-off to be due to the frequency dependence of the upstream-travelling waves. At high Mach number these become evanescent above a certain frequency, whereas at low Mach number they become progressively trapped with increasing frequency, a consequence of which is their not being reflected in the nozzle plane. Additionally, a weaker, low-frequency, forced-resonance regime is identified that involves the same upstream travelling jet modes but that couple, in this instance, with downstream-travelling sound waves. It is suggested that the existence of two resonance regimes may be due to the non-modal nature of wavepacket dynamics at low-frequency.Comment: 21 pages, 15 figure

Hypoxia Upregulates Estrogen Receptor β in Pulmonary Artery Endothelial Cells in a HIF-1α-Dependent Manner

17β-Estradiol (E2) attenuates hypoxia-induced pulmonary hypertension (HPH) through estrogen receptor (ER)-dependent effects, including inhibition of hypoxia-induced endothelial cell proliferation; however, the mechanisms responsible for this remain unknown. We hypothesized that the protective effects of E2 in HPH are mediated through hypoxia-inducible factor 1α (HIF-1α)-dependent increases in ERβ expression. Sprague-Dawley rats and ERα or ERβ knockout mice were exposed to hypobaric hypoxia for 2-3 weeks. The effects of hypoxia were also studied in primary rat or human pulmonary artery endothelial cells (PAECs). Hypoxia increased expression of ERβ, but not ERα, in lungs from HPH rats as well as in rat and human PAECs. ERβ mRNA time dependently increased in PAECs exposed to hypoxia. Normoxic HIF-1α/HIF-2α stabilization increased PAEC ERβ, whereas HIF-1α knockdown decreased ERβ abundance in hypoxic PAECs. In turn, ERβ knockdown in hypoxic PAECs increased HIF-2α expression, suggesting a hypoxia-sensitive feedback mechanism. ERβ knockdown in hypoxic PAECs also decreased expression of the HIF inhibitor prolyl hydroxylase 2 (PHD2), whereas ERβ activation increased PHD2 and decreased both HIF-1α and HIF-2α, suggesting that ERβ regulates the PHD2/HIF-1α/HIF-2α axis during hypoxia. Whereas hypoxic wild-type or ERα knockout mice treated with E2 demonstrated less pulmonary vascular remodeling and decreased HIF-1α after hypoxia compared with untreated hypoxic mice, ERβ knockout mice exhibited increased HIF-2α and an attenuated response to E2 during hypoxia. Taken together, our results demonstrate a novel and potentially therapeutically targetable mechanism whereby hypoxia, via HIF-1α, increases ERβ expression and the E2-ERβ axis targets PHD2, HIF-1α, and HIF-2α to attenuate HPH development

Challenging Classification Bias with Linked Data

Can library classification systems find new ways to deal with charges of bias? Can linked data contribute a more inclusive representation of diverse voices and communities? This panel will discuss the inherent biases present in cataloguing and classification, and consider the potential for linked data to provide a space to highlight and explore the challenging political issues that can arise in our work. These include issues related to jurisdiction, territory, and community with examples drawn from legal classification and the classification of cartographic resources

Exploring tourists’ slow food experience: perspectives from slow tourism

This paper aims to explore tourists’ slow food experience from slow tourism perspective, including authenticity, slowness, and environmental consciousness. Data will be collect in March 2021

MLI: An API for Distributed Machine Learning

MLI is an Application Programming Interface designed to address the challenges of building Machine Learn- ing algorithms in a distributed setting based on data-centric computing. Its primary goal is to simplify the development of high-performance, scalable, distributed algorithms. Our initial results show that, relative to existing systems, this interface can be used to build distributed implementations of a wide variety of common Machine Learning algorithms with minimal complexity and highly competitive performance and scalability