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Search Results: 1 - 10 of 3454 matches for " Tara Chaves "
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High Latitude HI in NGC 2613: Buoyant Disk-Halo Outflow
Judith A. Irwin,Tara Chaves
Physics , 2002, DOI: 10.1086/345891
Abstract: We combine new VLA D array HI data of NGC 2613 with previous high resolution data to show new disk-halo features in this galaxy. The global HI distribution is modeled in detail using a technique which can disentangle the effects of inclination from scale height and can also solve for the average volume density distribution in and perpendicular to the disk. The model shows that the galaxy's inclination is on the low end of the range given by Chaves & Irwin (2001) and that the HI disk is thin (z_e = 188 pc), showing no evidence for halo. Numerous discrete disk-halo features are observed, however, achieving z heights up to 28 kpc from mid-plane. One prominent feature in particular, of mass, 8X10^7 Msun and height, 22 kpc, is seen on the advancing side of the galaxy at a projected galactocentric radius of 15.5 kpc. If this feature achieves such high latitudes because of events in the disk alone, then input energies of order ~ 10^{56} ergs are required. We have instead investigated the feasibility of such a large feature being produced via buoyancy (with drag) within a hot, pre-existing X-ray corona. Reasonable plume densities, temperatures, stall height (~ 11 kpc), outflow velocities and ages can indeed be achieved in this way. The advantage of this scenario is that the input energy need only be sufficient to produce blow-out, a condition which requires a reduction of three orders of magnitude in energy. If this is correct, there should be an observable X-ray halo around NGC 2613.
Chandra Observation of the Edge-on Galaxy NGC 3556 (M 108): Violent Galactic Disk-halo Interaction Revealed
Q. Daniel Wang,Tara Chaves,Judith Irwin
Physics , 2003, DOI: 10.1086/379010
Abstract: We present a 60 ks Chandra ACIS-S observation of the isolated edge-on spiral NGC 3556, together with a multiwavelength analysis of various discrete X-ray sources and diffuse X-ray features. Among 33 discrete X-ray sources detected within the I_B = 25 mag per square arcsec isophote ellipse of the galaxy, we identify a candidate for the galactic nucleus, an ultraluminous X-ray source that might be an accreting intermediate-mass black hole, a possible X-ray binary with a radio counterpart, and two radio-bright giant HII regions. We detect large amounts of extraplanar diffuse X-ray emission, which extends about 10 kpc radially in the disk and >~ 4 kpc away from the galactic plane. The diffuse X-ray emission exhibits significant substructures, possibly representing various blown-out superbubbles or chimneys of hot gas heated in massive star forming regions. This X-ray-emitting gas has temperatures in the range of ~ 2-7 x 10^6 K and has a total cooling rate of ~ 2 x 10^40 erg/s. The energy can be easily supplied by supernova blast-waves in the galaxy. These results demonstrate NGC 3556 as being a galaxy undergoing vigorous disk-halo interaction. The halo in NGC 3556 is considerably less extended, however, than that of NGC 4631, in spite of many similarities between the two galaxies. This may be due to the fact that NGC 3556 is isolated whereas NGC 4631 is interacting. Thus NGC 3556 presents a more pristine environment for studying the disk-halo interaction.
Vozes do Camboja: formas locais de responsabiliza??o por atrocidades sistemáticas
Urs, Tara;
Sur. Revista Internacional de Direitos Humanos , 2007, DOI: 10.1590/S1806-64452007000200004
Abstract: this article seeks to defend three propositions. first, the extraordinary chambers in the courts of cambodia (informally known as the khmer rouge trials) is unlikely to achieve any of the primary goals put forward by its proponents. second, the court runs the risk of doing harm. third, it becomes apparent that other culturally-specific processes have a greater chance at making a long-term impact and satisfying victims.
The environmental feasibility of algae biodiesel production
Tara Shirvani
Applied Petrochemical Research , 2012, DOI: 10.1007/s13203-012-0015-5
Abstract: Microalgae can grow in waste or seawater, have vastly superior biomass yields per hectare and, most importantly, the CO2 removed from the atmosphere during photosynthetic growth of the plant offsets CO2 released during fuel combustion. Algae-based fuel products are more promising than first-generation biofuels, as they exclude land use and food security issues, but require a mass production breakthrough to be viable. Through a life cycle approach, we evaluate whether algal biodiesel production can be a viable fuel source once the energy and carbon intensity of the process are managed accordingly. Currently, algae biodiesel production is 2.5 times as energy intensive as conventional diesel. Biodiesel from advanced biomass can only realize its inherent environmental advantages of GHG emissions reduction once every step of the production chain is fully optimized and decarbonized. In the case of Saudi Arabia which operates on a 100 % fossil-based electricity and heat grid, the inherent environmental advantages of producing algae biodiesel would be heavily overshadowed by the nation’s carbon-intensive energy and power sector.
Beautiful Death: the Nineteenth-Century Fascination with Antigone
Tara Beaney
Opticon1826 , 2009, DOI: 10.5334/opt.070902
Abstract: This article investigates the reception of Sophocles’ Antigone in early nineteenth-century Germany, a period in which interest in ancient Greek tragedy flourished, with Antigone being particularly prominent. The essay considers two influential figures of the period who regarded the work highly: the philosopher G.W.F. Hegel (1770-1831) and the poet Friedrich H lderlin (1770- 1843). In discussing their attitudes towards Antigone, the article raises the long-standing philosophical problem of how tragic representations of suffering and death, such as Antigone’s self-sacrifice, can arouse aesthetic pleasure and fascination. To address this problem, a sociohistorical approach is taken, exploring how the topos of female death may have appealed to the imagination of these important thinkers. The story of Antigone has a peculiar persistence. Since Sophocles wrote the tragedy nearly two and a half thousand years ago, it has been repeatedly translated, adapted and interpreted, retaining its potential to captivate new audiences and readers. This phenomenon itself has attracted a wealth of critical studies, notably George Steiner’s Antigones (1984). Moreover, as any survey of critical interest in Antigone reveals, the story has been discussed in a wide range of discourses, from philosophy to politics to psychoanalysis and, more recently, feminism. In this article, my focus is on an intriguing confluence within the play, namely that of tragic death and femininity. I consider the reception of Antigone in Germany around the 1800s, when the tragedy was particularly popular, and I ask the question: to what extent was the fascination with this tragedy a fascination with Antigone’s death?
Wasted? Managing Decline and Marketing Difference in Third Tier Cities
JURA : Journal of Urban and Regional Analysis , 2012,
Abstract: Third-tier cities are neglected in the research literature. Global and second-tier cities provide the positive, proactive applications of city imaging and creative industries strategies. However, small cities – particularly those who reached their height and notoriety through the industrial revolution – reveal few strategies for stability, let alone growth. This study investigates an unusual third-tier city: Oshawa in Ontario Canada. Known as the home of General Motors, its recent economic and social development has been tethered to the arrival of a new institution of higher education: the University of Ontario Institute of Technology. Yet this article confirms that simply opening a university is not enough to commence regeneration or renewal, particularly if an institution is imposed on unwilling residents. Therefore, an alternative strategy – involving geosocial networking – offers a way for local businesses and organizations to attract customers and provide a digital medication to analogue injustice and decay.
Welcoming Undergraduates to Special Collections
Tara Wenger
Kansas Library Association College and University Libraries Section Proceedings , 2012, DOI: 10.4148/culs.v1i0.1617
Abstract: Special Collections libraries and librarians have increasingly strived to provide more access and openness to their collections and services. However, not all students have received the message. If “perception is reality” we need to change the perception of research libraries as an intimidating place, even when we believe we are welcoming to all. Kenneth Spencer Research Library, the rare books and manuscripts library of the University of Kansas, adopted two major initiatives during the summer with the express purpose of making our library more welcoming and accessible. Spencer Library staff has worked hard over the years to engage with faculty and students and promote use of our collections. As the number of class requests increase, we are making progress but still encounter assumptions that students will not be welcomed and it will be a confusing and intimidating process. In addition to bringing students into the building, we must show them once they arrive that we are a modern facility, even if our collections are historical. A warm, welcoming presence and an efficient mode of operation can go a long way toward getting students to give you the benefit of the doubt as you show them how special collections can inform their own research.
The Sixth Canadian Conference on International Health: Shifting Global Environments for Health and Development
Tara Kiran
University of Toronto Medical Journal , 2000, DOI: 10.5015/utmj.v77i2.1110
Co-production in Professional Practice: A Sociomaterial Analysis
Tara Fenwick
Professions & Professionalism , 2012, DOI: 10.7577/pp.v2i1.323
Abstract: Co-production, typically defined as services and products that are planned and delivered in full conjunction with clients, has become a popular policy discourse and prescription for professional practice across a wide range of public services. Literature tends to herald the democratic and even transformative potential of co-production, yet there is little empirical evidence of its processes and negotiations at the front lines of everyday practice. This article adopts a socio-material theoretical frame of professional knowing-in-practice to analyse these negotiations, drawing from a case study of community policing. The argument is situated in terms of implications of these co-production practices for professional learning.
Mobile Learning: the iPodification of Universities.
Tara Brabazon
Nebula , 2007,
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