Shock fitting applied to the prediction of high-speed rotor noise

A shock fitting method applied to the transonic small disturbance (TSD) potential equation is described. This method is then applied to a simple, two dimensional (2-D) rotating disturbance which is analogous to a shock radiating from the tip of a rotor blade in high speed hover. A comparison is made between the results of this method and the more standard shock capturing method. This comparison makes it clear that the effect of the results on the acoustic signature of the 2-D model is significant, and similar results can be expected when the method is extended to the three dimensional (3-D) case

White space: hegemonic representations of American Indians

This thesis argues that American Indian stereotypes within American social and cultural space serve to maintain hegemony over America’s Indigenous populace. Designations of the ‘Noble Savage’ and its derivatives, as a result of cultural appropriation, continue to misrepresent and perpetuate ideals of the American Indian ‘other’. Furthermore, by subjugating aspects of Indian-ness to white cultural identity, offers a narrative that reinforces cultural hegemony. This thesis extends Antonio Gramsci’s concept of cultural hegemony as a theoretical framework to analyse how cultural appropriation seeks to become validated within public discourse. This thesis will present three distinct case studies representative of appropriated American Indian cultural images and artefacts naturalised as aspects of white American culture. Alejandro G. Iñárritu’s 2015 film The Revenant, outlines the centrality of the American frontier as hegemonic narrative in the American consciousness, and augments American Indian culture to white culture; the Washington R*dskins sporting mascot, extends the discussion of appropriation through issues of representation and ownership, framed by hegemonic discourse of strong white masculinity; and the ‘Hipster Headdress’ offers a gender contrast to previous case studies through a feminine narrative which tests issues of objectification and sexualisation in the maintenance of stereotypical depictions of American Indians. By presenting American Indian representation via cultural appropriation, it is possible to argue the importance of cultural hegemony in describing and sanctioning this process, through ideological depictions of Indian-ness and the space they inhabit

Well-being, economic growth and social recession.

The third opinion piece for the Redefining Prosperity, fourth seminar "Wellbeing Policy.

Transport, atom blockade and output coupling in a Tonks-Girardeau gas

Recent experiments have demonstrated how quantum-mechanical impurities can be created within strongly correlated quantum gases and used to probe the coherence properties of these systems [S. Palzer, C. Zipkes, C. Sias, and M. K\"ohl, Phys. Rev. Lett. 103, 150601 (2009).]. Here we present a phenomenological model to simulate such an output coupler for a Tonks-Girardeau gas that shows qualitative agreement with the experimental results for atom transport and output coupling. Our model allows us to explore nonequilibrium transport phenomena in ultracold quantum gases and leads us to predict a regime of atom blockade, where the impurity component becomes localized in the parent cloud despite the presence of gravity. We show that this provides a stable mixed-species quantum gas in the strongly correlated limit

Alumina bearing in gas-lubricated gyros

Friction and wear properties of alumina bearings for use in gas-lubricated gyroscope

Return to society.

The Labour government faces the abyss. The Conservative party cannot break from the discredited orthodoxies of its past. It has failed to win people’s trust and can only hope for an election victory on a minority of the vote. Bereft of a credible economic strategy it will divide the country. The politics of both parties now belong to the past, not to the future. As Gramsci said, ‘the crisis consists precisely in the fact that the old is dying and the new cannot be born.’1 The MPs expenses scandal, the constitutional crisis and the profiteering of the banking oligarchy, are all morbid symptoms of this interregnum. We do not know what the next election will bring nor can we predict the fate of the Labour party. The task now is to begin building a progressive left movement that unlike New Labour will break with the legacy of Thatcherism and establish a new hegemony

Expanding the application of the Eu-oxybarometer to the lherzolitic shergottites and nakhlites: Implications for the oxidation state heterogeneity of the Martian interior

Experimentally rehomogenized melt inclusions from the nakhlite Miller Range 03346 (MIL 03346) and the lherzolitic shergottite Allan Hills 77005 (ALH 77005) have been analyzed for their rare earth element (REE) concentrations in order to characterize the early melt compositions of these Martian meteorites and to calculate the oxygen fugacity conditions they crystallized under. D(Eu/Sm)pyroxene/melt values were measured at 0.77 and 1.05 for ALH 77005 and MIL 03346, respectively. These melts and their associated whole rock compositions have similar REE patterns, suggesting that whole rock REE values are representative of those of the early melts and can be used as input into the pyroxene Eu-oxybarometer for the nakhlites and lherzolitic shergottites. Crystallization fO_2 values of IW + 1.1 (ALH 77005) and IW + 3.2 (MIL 03346) were calculated. Whole rock data from other nakhlites and lherzolitic shergottites was input into the Eu-oxybarometer to determine their crystallization fO_2 values. The lherzolitic shergottites and nakhlites have fO_2 values that range from IW + 0.4 to 1.6 and from IW + 1.1 to 3.2, respectively. These values are consistent with some previously determined fO_2 estimates and expand the known range of fO_2 values of the Martian interior to four orders of magnitude. The origins of this range are not well constrained. Possible mechanisms for producing this spread in fO_2 values include mineral/melt fractionation, assimilation, shock effects, and magma ocean crystallization processes. Mineral/melt partitioning can result in changes in fO_2 from the start to the finish of crystallization of 2 orders of magnitude. In addition, crystallization of a Martian magma ocean with reasonable initial water content results in oxidized, water-rich, late-stage cumulates. Sampling of these oxidized cumulates or interactions between reduced melts and the oxidized material can potentially account for the range of fO_2 values observed in the Martian meteorites

Quantifying temporal and spatial variations in sediment, nitrogen and phosphorus transport in stream inflows to a large eutrophic lake

High-frequency sampling of two major stream inflows to a large eutrophic lake (Lake Rotorua, New Zealand) was conducted to measure inputs of total suspended sediment (TSS), and fractions of nitrogen and phosphorus (P). A total of 17 rain events were sampled, including three during which both streams were simultaneously monitored to quantify how concentration–discharge (Q) relationships varied between catchments during similar hydrological conditions. Dissolved inorganic nitrogen (DIN) concentrations declined slightly during events, reflecting dilution of groundwater inputs by rainfall, whereas dissolved inorganic P (PO₄–P) concentrations were variable and unrelated to Q, suggesting dynamic sorptive behaviour. Event loads of total nitrogen (TN) were predominantly DIN, which is available for immediate uptake by primary producers, whereas total phosphorus (TP) loads predominantly comprised particulate P (less labile). Positive correlations between Q and concentrations of TP (and to a lesser extent TN) reflected increased particulate nutrient concentrations at high flows. Consequently, load estimates based on hourly Q during storm events and concentrations of routine monthly samples (mostly base flow) under-estimated TN and TP loads by an average of 19% and 40% respectively. Hysteresis with Q was commonly observed and inclusion of hydrological variables that reflect Q history in regression models improved predictions of TN and TP concentrations. Lorenz curves describing the proportions of cumulative load versus cumulative time quantified temporal inequality in loading. In the two study streams, 50% of estimated two-year loads of TN, TP and TSS were transported in 202–207, 76–126 and 1–8 days respectively. This study quantifies how hydrological and landscape factors can interact to influence pollutant flux at the catchment scale and highlights the importance of including storm transfers in lake loading estimates