1,212 research outputs found
11 Foot Unitary Plan Tunnel Facility Optical Improvement Large Window Analysis
The test section of the 11 by 11-foot Unitary Plan Transonic Wind Tunnel (11-foot UPWT) may receive an upgrade of larger optical windows on both the North and South sides. These new larger windows will provide better access for optical imaging of test article flow phenomena including surface and off body flow characteristics. The installation of these new larger windows will likely produce a change to the aerodynamic characteristics of the flow in the Test Section. In an effort understand the effect of this change, a computational model was employed to predict the flows through the slotted walls, in the test section and around the model before and after the tunnel modification. This report documents the solid CAD model that was created and the inviscid computational analysis that was completed as a preliminary estimate of the effect of the changes
The Ship Goes Both Ways: Cross-cultural Writing by Joy Damousi, Antigone Kefala, Eleni Nickas and Beverley Farmer
The focus of this paper is writerly and academic women primarily from the Greek/Australian Diaspora, who relate experiences of love, loss, grief and âoutside belongingâ in their academic and writerly work. The diasporic/transnational expe riences of Greek migrant women, provides fertile writing ground for people making the ânew worldâ of Australia home. This Australia, is a land already disturbed and haunted by a hostile tale of settlement, where its indigenous culture remains insufficiently valued and understood, let alone the habits and practices, grief âs and longings of migrants and refugees. In contrast to Pierre Bourdieuâs fixed and stable notion of habitus, field and agency, Cultural theorist Elspeth Probyn talks about an âoutside belongingâ felt by people who move between social, cultural, and geographic worlds. Australia is a land filled, it seems, with people located from, âoutside belongingâ, reconsidered here through writerly transnational exchange between Greece and Australia. With specific diegetic intention, this paper charts the journeys of these writers through the metaphor of a ship that goes both ways. Helen Nickasâ anthology Motherâs from the Edge (2006) narrates, through allegory, humour and grief, the experiences of Greek migrant women who have travelled to the ânew worldâ of Australia. Her more recent autobiography Athina and her Daughters: a memoir of two worlds (2009), unpacks this territory with intimate and historical detail. Beverley Farmer travels in the opposite direction to the new âold worldâ of Greece. Her early writing as with Charmian Clift who precedes her, is doused in the harrowing, peppered with wit and metaphor, loss and longing, as she culturally navigate a foreign land. Such writing produces a textual and cultural richness that I argue could be better represented and dispersed in contemporary Australian literary (and cultural) studies
Changes in Understorey Pasture Composition in Agroforestry Regimes in New Zealand
Long term Agroforestry trials were established in the North and South Islands of New Zealand between 1971-76. They compared a range of final tree stockings of Pinus radiata planted into pasture with open pasture control plots and were measured for tree growth parameters and agricultural production. This paper presents the results of pasture species changes over the period of tree age 10-22 years. Pasture species composition under Pinus radiata changed with time, dependent primarily on the rate of canopy closure. Changes occurred relatively rapidly in high tree stocked areas of 400 stems per hectare (sph) in the North Island trials where ryegrass (Lolium perenne L) and white clover (Trifolium repens L) were replaced with annual and native grass until canopy closure resulted in loss of all pasture by tree age 13 years. In lower tree stocked areas these changes occurred more slowly so that by tree age 19 years, pasture species such as Yorkshire Fog (Holcus lanatus) and annual grasses (Poa Species) still contributed to the ground cover. In the South Island trials, pasture persisted longer into the tree rotation. Open pasture (0 sph) retained similar pasture species to that at the trial commencement in all locations. A point analysis technique at one North Island site gave a good measure of ground surface cover over time
The Effects of Shelterbelts on Adjacent Pastures and Soils in a Temperate Climate
Two trials were conducted to differentiate the direct (exposure) from the indirect (modified soil fertility due to nutrient transfer by grazing animals) effects of farm shelterbelts on associated pasture growth.Soil from close to âunmanagedâshelterbelts with dense shelter to ground level had relatively high potassium (K) levels and, in a glasshouse situation, provided more pasture growth than soil from further distances, or from adjacent to âmanagedâ shelterbelts. Pasture grown in boxes of a common soil implanted at increasing distances from a shelterbelt also produced highest growth rates close to shelter. These results generally explain the pattern of resident pasture growth, except for the closest (5 metre) distance which had the lowest pasture growth.This appears related to relatively low soil moisture levels at these sites, due either to rain shelter or tree root competition effects
Asteroid amphitrite: Surface composition and prospects for the possible Galileo flyby
Studies of the trajectory of the Galileo mission to Jupiter recently revealed that the spacecraft can pass close to one of the largest asteroids (#29 Amphitrite). NASA has therefore altered the mission plan of the Galileo spacecraft to include a possible close flyby of Amphitrite in early December 1986, if the condition of the spacecraft allows. If this option is actually implemented, Amphitrite will become the only asteroid for which any high-spatial resolution images and reflection spectra will be available. To evaluate the value of this data and place Amphitrite in the context of the more than 600 asteroids for which some compositional information exists. Existing data was reexamined, new telescopic spectra of Amphitrite were obtained, and simulated Galileo data sets were constructed
Space station impact experiments
Four processes serve to illustrate potential areas of study and their implications for general problems in planetary science. First, accretional processes reflect the success of collisional aggregation over collisional destruction during the early history of the solar system. Second, both catastrophic and less severe effects of impacts on planetary bodies survivng from the time of the early solar system may be expressed by asteroid/planetary spin rates, spin orientations, asteroid size distributions, and perhaps the origin of the Moon. Third, the surfaces of planetary bodies directly record the effects of impacts in the form of craters; these records have wide-ranging implications. Fourth, regoliths evolution of asteroidal surfaces is a consequence of cumulative impacts, but the absence of a significant gravity term may profoundly affect the retention of shocked fractions and agglutinate build-up, thereby biasing the correct interpretations of spectral reflectance data. An impact facility on the Space Station would provide the controlled conditions necessary to explore such processes either through direct simulation of conditions or indirect simulation of certain parameters
Preliminary results of spectral reflectance studies of tycho crater
The preliminary analysis and interpretation of near infrared spectra obtained for both the interior and exterior deposits associated with the Tycho crater is presented. Specific objectives were: (1) to determine the composition and stratigraphy of the highland crust in the Tycho target site; (2) to determine the likely composition of the primary ejecta which may be present in ray deposits; (3) to investigate the nature of spectral units defined in previous studies; (4) to further investigate the nature and origin of both the bright and dark haloes around the rim crest; and (5) to compare the compositions determined for the Tycho units with those of the Aristarchus crater as well as typical highland deposits. The spectra obtained for the interior areas exhibit similar spectral features. These include relatively strong 1 micron absorption bands whose minima are centered between 0.97 and 0.99 microns and shallow to intermediate continuum slopes. The spectra generally exhibit indications of a 1.3 micron feature consistent with the presence of Fe(2+) bearing plagioclase feldspar. The strong 1 micron absorption features indicate a dominant high Ca clinopyroxene component. Results obtained from the ejecta deposits show that the spectrum of the inner, bright halo is almost identical with those obtained for interior units. The spectrum of the dark halo exhibits a wide, relatively shallow absorption feature centered at 1.01 microns, a 1.3 micron absorption, and a steep continuum slope. This spectrum is interpreted as indicating the presence of pyroxene, Fe-bearing feldspar, and a significant component of Fe-bearing impact melt glass. Finally, the spectra of spots inside Tycho show similarity with certain spectra for Aristarchus. However, the suite of spectra obtained for Tycho exhibits a different trend in terms of band center versus width
Correction of the spectral calibration of the Joint European Torus core light detecting and ranging Thomson scattering diagnostic using ray tracing
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