307 research outputs found
Bedrock Geology Map of the Cavity Lake Fire Area: Cook County, Northeastern Minnesota
No full textThis map is the result of three and a half days of mapping in the Cavity Lake burn area on
Gabimichigami Lake. It is the third map in a series of maps produced by the Precambrian Research Center Field Camp for the summer of 2007. The mapping area included portions of the Ogishkemuncie Lake and Gillis Lake U.S.G.S. 7.5' Quadrangles. Mapping was performed primarily on Gabimichigami Lake,and extended north to Agamok Lake and east to Howard Lake and Peter Lake. The field area was split into two study areas: the basal contact of the Duluth Complex (Tuscarora intrusion),and the structural elements of the meta-sediments associated with the collapse of an Archaean caldera. The area was previously mapped by Gruner in 1938 in a large-scale regional mapping project of the structural geology of the Knife Lake area of north-eastern Minnesota. The purpose of this mapping was two-fold: 1) a capstone project for field camp students that provided hands on geologic experience in a serene wilderness setting, and 2) to assist in the larger goal of the state of Minnesota to remap the Boundary Waters Canoe Area.Costello, Daniel E; Gál, Benedek; Hoaglund, Steven Arthur; Putz, Amanda J; Jirsa, Mark A. (2007). Bedrock Geology Map of the Cavity Lake Fire Area: Cook County, Northeastern Minnesota. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/257360
U-Pb geochronology of the Duluth Complex and related hypabyssal intrusions: investigating the emplacement history of a large multiphase intrusive complex related to the 1.1 Ga Midcontinent Rift.
No full textUniversity of Minnesota M.S. thesis. July 2010. Major: Geological Sciences. Advisor: James D. Miller Jr. 1 computer file (PDF); vii, 103 pages. Ill. (some col).Paces and Miller (1993) precisely established the main intrusive periods that
created the Duluth Complex and related intrusions associated with the 1.1 Ga
Midcontinent Rift in NE Minnesota. They did not, however, resolve differences in
emplacement ages within and between major intrusive units due to a small number of
dated samples. New high-precision U-Pb baddeleyite and zircon ages from five mafic
intrusions related to the Duluth Complex builds on the work of Paces and Miller (1993).
Ages from three intrusions that span the entire range of Duluth Complex layered
series intrusive activity indicate that the layered series and anorthositic series were
synchronously emplaced around 1098 Ma. Moreover, zircon ages obtained from the
perceived oldest (Partridge River, 206Pb/238U age 1095.94 ± 0.18 Ma) and youngest (Bald
Eagle, 206Pb/238U age 1095.64 ± 0.19 Ma) layered series intrusions suggest the bulk of
layered series activity occurred within a period of 670 ka. The Tuscarora intrusion (early
layered series) has a distinctly older 207Pb/206Pb baddeleytie age than the Partridge River
intrusion (1098.81 ± 0.32 and 1097.98 ± 0.37 Ma, respectively). However, in light of
new information regarding the incompatibility between zircon and baddeleyite ages, its
temporal relationship with other layered series intrusions remains unclear.
Zircon ages obtained from two early Beaver Bay Complex (BBC) intrusions indicate Duluth Complex and BBC magmatism likely overlap. The Houghtaling Creek
troctolite is indistinguishable from the other layered series intrusions. Moreover, the
Wilson Lake ferrogabbro, long interpreted to be older than the Houghtaling Creek, is
distinctly younger (207Pb/206Pb zircon ages 1095.75 ± 0.92 and 1098.62 ± 0.50 Ma,
respectively). There still exists an approximate 2 Ma gap between early Beaver Bay and
Duluth Complex, and late BBC.
A reasonable estimate based on the geometry of layered series intrusions indicate
that over 16,000 km3 of mafic magma intruded during layered series emplacement (excluding unknowable amounts of erosion). With over 16,000 km3 of mafic magma
being intruded over a period of 670 ka, emplacement rates were at least 0.024 km3/yr,
which is similar to estimates for other large continental flood basalt provinces.Hoaglund, Steven Arthur. (2010). U-Pb geochronology of the Duluth Complex and related hypabyssal intrusions: investigating the emplacement history of a large multiphase intrusive complex related to the 1.1 Ga Midcontinent Rift.. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/93624
Arthur Danto's philosophy of art
No full textThe thesis is a critical examination of Danto's philosophy of art. It begins with his
article 'The Artworld' where he proposes a special is of artistic identification to
distinguish artworks. Danto's idea of the artworld is discussed, a historical and
contextual theory of art, which arose from his attempt to explain the difference
between Warhol's Brillo Boxes sculpture and an indiscernible stack of everyday
Brillo boxes. It is argued that Danto unsuccessfully attempts to shore up his artworld
concept with the special is.
The technique of comparing indiscernible counterparts, from Danto's
book The Transfiguration of the Commonplace, is examined. It is argued that the
technique is philosophically redundant, but it is a redundant premise which has been
added to a valid inference (Danto's historical and contextual view of art: his artworld
theory) therefore, this does not make the original inference invalid.
Danto's treatment of metaphor, expression, and style is shown to result
in four claims. First, artworks embody rhetorical ellipsis. Second, artworks share
features of metaphor: they are intensional (with an s) in structure and cannot be
paraphrased. Third, a work of art expresses what it is a metaphor for by the way it
depicts its subject. Fourth, artworks embody style.
The conclusion, has two parts. The first part gives a summary of the
criticism of Danto's theory of art: (1) there are logical inconsistencies in his concept
of the is of artistic identification and in his use of indiscernible counterparts, (2) his
theory suffers by being over-inclusive and (3) he uses circular arguments. The
second part is based on a response to the criticism: it provides a definition of art.
This has three elements. First, an argument is proposed for a spectrum of artistic
presence in which all human activity and artefacts can be placed. Second, there is an
acceptance of Danto's view of art (or artistic presence) being both intentional (with
a t) and intensional (with an s); however, by applying these concepts to a spectrum,
the problem of over-inclusiveness is avoided. Finally, it is argued there can he no
wholly non-circular account of art
Ambivalent elites and conservative modernizers : studying sideways in transnational contexts ; paper for the conference 'Alltag der Globalisierung. Perspektiven einer transnationalen Anthropologie', January 16-18, 2003, Institute of Cultural Anthropology and European Ethnology, Johann Wolfgang Goethe University, Frankfurt am Main
No full textSpacially dispersed transnational professional communities can be perceived of as cultural formations living in a global frame of reference, transgressing existing political and cultural boundaries. In their capacity as members of local technical and knowledgebased elites, they take part in circulating and connecting cultural meanings that are both locally produced, and continuously re-working non- local flows. I argue that those elites can be described as actors at cultural interfaces, taking part in shaping and mediating social change. The aim is twofold: one, to point to mutually opposed tendencies, and ambivalences in the framework of a „culture of change“, and two, to look into the question how such situations and groups can be methodologically approached
In search of American Jewish culture
No full textThe author focuses on areas where the specifically Jewish contribution has been little explored. he surveys popular music, musical theatre, and drama, focusing on key figures including Bob Dylan, Arthur Miller and others. the author alsoTackles the issue of race and American Jewish culture, as well as focusing on stage and film adaptations of Anne Frank's diary and on Steven Spielberg's Schindler's lis
Macroplastic pollution in freshwater environments: Focusing public and policy action
No full textUnderstanding and managing plastic pollution is an increasingly important environmental priority for policy makers, businesses and scientists. Awareness of the potential damage to the world's oceans has grown but there is less attention given to freshwater ecosystems. Yet, rivers are the dominant source of plastic pollution to the marine environment, as well as a potential sink, accumulating plastic from multiple sources. Actions to reduce the presence of macroplastics in rivers is fundamental to conserving both freshwater and marine environments, but there is limited understanding of potential pollution sources, vectors and storage. Importantly, there are only a handful of studies examining the typologies of freshwater macroplastic pollution, often using different categories and collection methods. This impedes setting priorities for scientific investigation and mitigation measures. The present study identifies the most prevalent macroplastic items in freshwater environments in Europe, with a focus on consumer plastic items, i.e. those that could potentially be reduced by targeted actions by the public, as well as industrial and government intervention. Our analysis addresses the differences between reported macroplastics in freshwater and marine environments as well as those estimated from litter rates. Our results identify a macroplastic “top ten”, i.e. those dominant plastic typologies that require a more focused effort to reformulate their use and management, as well as setting a common baseline for a more consistent data gathering and reporting approach.
© 2019 The Author(s
Resuscitating the author: implications of Danto's philosophy for historians of trend-defying architecture
No full textThe paper revisits the often-contested terrain of historiography that is reliant on meta-narratives with specific reference to the writings of philosopher Arthur C. Danto. Architectural historians of-ten position their subjects according overarching views of history (commonly known as meta-narratives), an approach that seems incongruous to the study of architects who defy historical trends in the pursuit of shocking or iconic works. The paper argues that historians of trend-defying architecture can simply index the facts (telling small, unconnected and potentially banal stories), or else follow the lead of an historian like Danto (who is also a philosopher of historiography), who has abandoned the poststructuralist catch-cry 'the author is dead' to pursue a sophisticated kind of indexing that seeks to penetrate the thoughts and words of artists and architects. His approach is a fitting response to an art world that, he argues, exhausted its meta-narratives. The paper discusses Danto's texts in this light, while referring to a recent interview between Danto and the present author, about the implications, for architectural historians, of this seminal work on the analytical philosophy of history
Forgive or Buy Back: An Experimental Study of Debt Relief
No full textA large share of the debt claims owed by the world’s poorest countries has been cancelled through the HIPC (highly indebted poor countries) debt relief initiative. It is believed that, with less debt burden, the HIPC will be able to devote more resources to investment and thus promote their own growth and benefit their creditors in the long run. But does debt forgiveness really provide the best incentive for those countries who suffers from debt overhang? In this paper, we adopt experimental methods to study the impact of two different schemes for relieving debt. The two schemes we consider here are debt forgiveness and debt buyback, with the latter being more market-based since it allows indebted countries to repurchase their own debt on the secondary market at a discount. We find that creditors tend to reduce more debt when the relief takes the form of debt forgiveness than that of buyback. Debtors under the scheme of forgiveness are not significantly more reciprocal than those of buyback. After controlling for the amount of debt relief, creditors are significantly worse off under forgiveness whereas debtors are indifferent between the two schemes. Overall, debt forgiveness yields less desirable outcomes than debt buybacks.Laboratory Experiments
Loss mechanisms in turbine tip clearance flows
No full textThesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2011.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from student submitted PDF version of thesis.Includes bibliographical references (p. 109-110).Numerical simulations of tip clearance ow have been carried out to dene the loss generation mechanisms associated with tip leakage in unshrouded axial turbines. Mix- ing loss between the leakage, which takes the form of a strong embedded streamwise vortex (u=ux 1 in the vortex core), and the mainstream ow is found to be the main source of loss. Vortex line contraction, and consequent vortex core expansion, and also vortex breakdown, are identied as the two important mechanisms that determine mixing loss. Because of these vortex dynamic features, the behavior is dierent from the conventional view of the effect of pressure level on mixing of non- uniform flows. More specifically, it is shown, through control volume arguments and axisymmetric computations, that as a strongly swirling ow passes through a pres- sure rise, the mixed-out loss can either decrease or increase, the latter occurring if the deceleration becomes large enough to initiate vortex breakdown. It is further shown that tip vortices in turbines experience pressure rises large enough to cause vortex breakdown. The effect of pressure distribution on tip leakage losses is illustrated through examination of two turbine blades, one designed with a forward loaded tip and one with an aft loaded tip. The computations show a 16% difference in tip clearance loss between the two, due to the lower pressure rise encountered by the clearance vortex, and hence lower vortex breakdown losses, with the forward loaded blade. Other computational experiments, on the effects of blade loading, incidence, and solidity, are also shown to be consistent with the ideas developed about blade pressure distribution effects on vortex breakdown and hence clearance mixing loss.by Arthur Huang.S.M
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