Cronfa at Swansea University
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    53078 research outputs found

    On the Smoothness of the Noncommutative Pillow and Quantum Teardrops

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    Local competition and metapopulation processes drive long-term seagrass-epiphyte population dynamics

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    Buoyancy regulation in Phaeocystis globosa Scherffel colonies

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    What Is Cyberterrorism? Findings From a Survey of Researchers

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    This article reports on a recent survey designed to capture understandings of cyberterrorism across the global research community. Specifically, it explores competing views, and the importance thereof, amongst the 118 respondents on three definitional issues: First, the need for a specific definition of cyberterrorism for either policymakers or researchers; Second, the core characteristics or constituent parts of this concept; and, Third, the value of applying the term cyberterrorism to a range of actual or potential scenarios. The article concludes by arguing that while a majority of researchers believe a specific definition of cyberterrorism necessary for academics and policymakers, disagreement around what this might look like has additional potential to stimulate a rethinking of terrorism more widely

    JOLED: A mid-air display based on electrostatic rotation of levitated Janus objects

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    Temperature dependence on the mass susceptibility and mass magnetization of superparamagnetic Mn–Zn–ferrite nanoparticles as contrast agents for magnetic imaging of oil and gas reservoirs

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    The mass susceptibility (χmass) and mass magnetization (Mmass) were determined for a series of ternary manganese and zinc ferrite nanoparticles (Mn–Zn ferrite NPs, MnxZn1−xFe2O4) with different Mn:Zn ratios (0.08 ≤ x ≤ 4.67), prepared by the thermal decomposition reaction of the appropriate metal acetylacetonate complexes, and for the binary homologs (MxFe3−xO4, where M = Mn or Zn). Alteration of the Mn:Zn ratio in Mn–Zn ferrite NPs does not significantly affect the particle size. At room temperature and low applied field strength the mass susceptibility increases sharply as the Mn:Zn ratio increases, but above a ratio of 0.4 further increase in the amount of manganese results in the mass susceptibility decreasing slightly, reaching a plateau above Mn:Zn ≈ 2. The compositional dependence of the mass magnetization shows less of a variation at room temperature and high applied fields. The temperature dependence of the mass magnetization of Mn–Zn ferrite NPs is significantly less for Mn-rich compositions making them more suitable for downhole imaging at higher temperatures (>100 °C). For non-shale reservoirs, replacement of nMag by Mn-rich Mn–Zn ferrites will allow for significant signal-to-noise enhancement of 6.5× over NP magnetite

    An Emulated PV Source Based on an Unilluminated Solar Panel and DC Power Supply

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    This paper provides a review on various PV simulator technologies as well as presents a novel equivalent photovoltaic (PV) source that was constructed by using un-illuminated solar panels and a DC power supply that operates in current source mode. The constructed PV source was used for testing photovoltaic converters and various maximum power point tracking (MPPT) algorithms required for capturing the maximum possible output power. The mathematical model and electrical characteristics of the constructed PV source were defined and analysed. The constructed PV source has the advantages of high bandwidth over the switching circuit based PV simulators. The constructed PV source has been used for testing various power electronics converters and various control techniques effectively in laboratory environments for researchers and university student


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