2,440 research outputs found
UTPA News - Steven P. Schneider
No full textSteven P. Schneider is Professor of English at The University of Texas-Pan American, where he also serves as Director of New Programs and Special Projects for the College of Arts and Humanities. Steven is a founding member of the South Texas Literacy Coalition in the Rio Grande Valley and is the recipient of two Big Read grants from the National Endowment for the Arts. He has used the Borderlines: Drawing Border Lives traveling exhibit to promote the teaching of culturally relevant literature and creativity. Steven offers a variety of workshops on these topics to both high school and college students and teachers. Steven Schneider has published his poetry widely and given readings throughout the United States, including public performances at the Iowa Summer Writing Festival, the Fort Kearny Writers\u27 Conference, the UTPA Summer Creative Writing Institute, and the South Texas Literary Festival. He has also been interviewed and read his work on NETV. Steven Schneider\u27s poems and essays have been published in national and international journals, including Critical Quarterly, Prairie Schooner, Tikkun, The Literary Review, and featured in American Life in Poetry. He is the author of several books, including two collections of poetry, Prairie Air Show and Unexpected Guests, a scholarly book entitled A.R. Ammons and the Poetics of Widening Scope and the editor of Complexities of Motion: New Essays on A.R. Ammons\u27s Long Poems. He is a winner of an Anna Davidson Rosenberg Award for Poetry and a Nebraska Arts Council Fellowship.https://scholarworks.utrgv.edu/utpamedia/1246/thumbnail.jp
Age and geochemistry of the Charlestown Group, Ireland: implications for the Grampian orogeny, its mineral potential and the Ordovician timescale
Full text linkAccurately reconstructing the growth of continental margins during episodes of ocean closure has important implications for understanding the formation, preservation and location of mineral deposits in ancient orogens. The Charlestown Group of county Mayo, Ireland, forms an important yet understudied link in the Caledonian-Appalachian orogenic belt located between the well documented sectors of western Ireland and Northern Ireland. We have reassessed its role in the Ordovician Grampian orogeny, based on new fieldwork, high-resolution airborne geophysics, graptolite biostratigraphy, U–Pb zircon dating, whole rock geochemistry, and an examination of historic drillcore from across the volcanic inlier. The Charlestown Group can be divided into three formations: Horan, Carracastle, and Tawnyinah. The Horan Formation comprises a mixed sequence of tholeiitic to calc-alkaline basalt, crystal tuff and sedimentary rocks (e.g. black shale, chert), forming within an evolving peri-Laurentian affinity island arc. The presence of graptolites Pseudisograptus of the manubriatus group and the discovery of Exigraptus uniformis and Skiagraptus gnomonicus favour a latest Dapingian (i.e. Yapeenian Ya 2/late Arenig) age for the Horan Formation (equivalent to c. 471.2–470.5 Ma according to the timescale of Sadler et al., 2009). Together with three new U–Pb zircon ages of 471.95–470.82 Ma from enclosing felsic tuffs and volcanic breccias, this fauna provides an important new constraint for calibrating the Middle Ordovician timescale. Overlying deposits of the Carracastle and Tawnyinah formations are dominated by LILE- and LREE-enriched calc-alkaline andesitic tuffs and flows, coarse volcanic breccias and quartz-feldspar porphyritic intrusive rocks, overlain by more silicic tuffs and volcanic breccias with rare occurrences of sedimentary rocks. The relatively young age for the Charlestown Group in the Grampian orogeny, coupled with high Th/Yb and zircon inheritance (c. 2.7 Ga) in intrusive rocks indicate that the arc was founded upon continental crust (either composite Laurentian margin or microcontinental block). Regional correlation is best fitted to an association with the post-subduction flip volcanic/intrusive rocks of the Irish Caledonides, specifically the late-stage development of the Tyrone Igneous Complex, intrusive rocks of Connemara (western Ireland) and the Slishwood Division (Co. Sligo). Examination of breccia textures and mineralization across the volcanic inlier questions the previous porphyry hypothesis for the genesis of the Charlestown Cu deposit, which are more consistent with a volcanogenic massive sulfide (VMS) deposit.</p
Mathematics
No full text"Inservice education"--Final (unnumbered) p. of each document.; Includes bibliographical references.T. Teaching mathematics : elementary & middle grades / prepared by Steven P. Meiring (19 p.) -- K. Kindergarten mathematics / principal authors, James B. Wesson, Steven P. Meiring (18 p.) -- 1. First grade mathematics (18 p.) ; 2. Second grade mathematics (15 p.) ; 3. Third grade mathematics (18 p.) / principal author, C. Winston Smith, Jr. -- 4. Fourth grade mathematics (21 p.) ; 5. Fifth grade mathematics (19 p.) / principal author, James B. Wesson -- 6. Sixth grade mathematics (19 p.) ; 7. Seventh grade mathematics (23 p.) / principal author, William R. Speer -- 8. Eighth grade mathematics (19 p.) ; 8E. Eighth grade enrichment mathematics / principal author, James E. Schultz.A series of eleven monographs describing mathematics learning in the elementary and middle grades. These documents identify appropriate outcomes for each grade level and discuss teaching methods for helping students achieve those outcomes
Petrochemistry and hydrothermal alteration within the Tyrone Igneous Complex, Northern Ireland: implications for VMS mineralization in the British and Irish Caledonides
No full textAlthough volcanogenic massive sulfide (VMS) deposits can form within a wide variety of rift-related tectonic environments, most are preserved within suprasubduction affinity crust related to ocean closure. In stark contrast to the VMS-rich Appalachian sector of the Grampian-Taconic orogeny, VMS mineralization is rare in the peri-Laurentian British and Irish Caledonides. Economic peri-Gondwanan affinity deposits are limited to Avoca and Parys Mountain. The Tyrone Igneous Complex of Northern Ireland represents a ca. 484–464 Ma peri-Laurentian affinity arc–ophiolite complex and a possible broad correlative of the Buchans-Robert’s Arm belt of Newfoundland, host to some of the most metal-rich VMS deposits globally. Stratigraphic horizons prospective for VMS mineralization in the Tyrone Igneous Complex are associated with rift-related magmatism, hydrothermal alteration, synvolcanic faults, and high-level subvolcanic intrusions (gabbro, diorite, and/or tonalite). Locally intense hydrothermal alteration is characterized by Na-depletion, elevated SiO2, MgO, Ba/Sr, Bi, Sb, chlorite–carbonate–pyrite alteration index (CCPI) and Hashimoto alteration index (AI) values. Rift-related mafic lavas typically occur in the hanging wall sequences to base and precious metal mineralization, closely associated with ironstones and/or argillaceous sedimentary rocks representing low temperature hydrothermal venting and volcanic quiescence. In the ca. 475 Ma pre-collisional, calc-alkaline lower Tyrone Volcanic Group rift-related magmatism is characterized by abundant non-arc type Fe-Ti-rich eMORB, island-arc tholeiite, and low-Zr tholeiitic rhyolite breccias. These petrochemical characteristics are typical of units associated with VMS mineralization in bimodal mafic, primitive post-Archean arc terranes. Following arc-accretion at ca. 470 Ma, late rifting in the ensialic upper Tyrone Volcanic Group is dominated by OIB-like, subalkaline to alkali basalt and A-type, high-Zr rhyolites. These units are petrochemically favorable for Kuroko-type VMS mineralization in bimodal-felsic evolved arc terranes. The scarcity of discovered peri-Laurentian VMS mineralization in the British and Irish Caledonides is due to a combination of minimal exploration, poor-preservation of upper ophiolite sequences, and limited rifting in the Lough Nafooey arc of western Ireland. The geological and geochemical characteristics of the Tyrone Volcanic Group of Northern Ireland and peri-Gondwanan affinity arc/backarc sequences of Ireland and northwest Wales represent the most prospective sequences in the British and Irish Caledonides for VMS mineralization
Unified mathematical treatment of complex cascaded bipartite networks: The case of collections of journal papers
Full text linkIn this study, a mathematical treatment is proposed for analysis of entities and relations among entities in
complex networks consisting of cascaded bipartite networks. This treatment is applied to the case of
collections of journal papers. In this case, entities are distinguishable objects and concepts, such as papers,
references, paper authors, reference authors, paper journals, reference journals, institutions, terms, and term
definitions. Relations are associations between entity-types such as papers and the references they cite, or
paper authors and the papers they write. An entity-relationship model is introduced that explicitly shows
direct links between entity-types and possible useful indirect relations. From this a matrix formulation and
generalized matrix arithmetic are introduced that allow easy expression of relations between entities and
calculation of weights of indirect links and co-occurrence links. Occurrence matrices, equivalence
matrices, membership matrices and co-occurrence matrices are described. A dynamic model of growth
describes recursive relations in occurrence and co-occurrence matrices as papers are added to the paper
collection. Graph theoretic matrices are introduced to allow information flow studies of networks of papers
linked by their citations. Similarity calculations and similarity fusion are explained. Derivation of feature
vectors for pattern recognition techniques is presented. The relation of the proposed mathematical
treatment to seriation, clustering, multidimensional scaling, and visualization techniques is discussed. It is
shown that most existing bibliometric analysis techniques for dealing with collections of journal papers are
easily expressed in terms of the proposed mathematical treatment: co-citation analysis, bibliographic
coupling analysis, author co-citation analysis, journal co-citation analysis, Braam-Moed-vanRaan (BMV)
co-citation/co-word analysis, latent semantic analysis, hubs and authorities, and multidimensional scaling.
This report discusses an extensive software toolkit that was developed for this research for analyzing and
visualizing entities and links in a collection of journal papers. Additionally, an extensive case study is
presented, analyzing and visualizing 60 years of anthrax research through a collection of journal papers.
When dealing with complex networks that consist of cascaded bipartite networks, the treatment presented
here provides a general mathematical framework for all aspects of analysis of static network structure and
network dynamic growth. As such, it provides a basic paradigm for thinking about and modeling such
networks: computing direct and indirect links, expressing and analyzing statistical distributions of network
characteristics, describing network growth, deriving feature vectors, clustering, and visualizing network
structure and growth
Les évidences défaites de Steven Millhauser
Full text linkFrom his first novel, Edwin Mullhouse (1972), to his latest collection of short stories, We Others (2011), the American writer Steven Millhauser recurrently ponders the complex relations that can be established between language, fiction and reality. Through various narratological, stylistic and discursive processes, the author creates minute gaps between the real and the usual categories of the understanding, thus examining the act of nomination, the performativity of language, and the artifice of fiction. As he reveals how reality sometimes « refuses to accept any language » (Dangerous Laughter, p. 101), the author seems to highlight the limits of fiction writing. Yet his writing goes beyond the postmodern assumption that language cannot (re)present anything but itself. Indeed, what truly sets the writing in motion is a thwarted desire of nomination, from failure to failure. Paradoxically, language can fully flourish only when faced with the unspeakable. The apparent weakness of language — its inability to express reality in its most singular manifestation — ultimately becomes its real chance. The work of fiction, as presented by the author, does not seek to incarnate or to embody the world — it tries to open up new perspectives on the real while remaining language. Steven Millhauser thus carefully invents a new kind of realism capable of inscribing in the text what the author himself defines as « the blazing thing that deserves the name of reality.
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Magnetic properties of an analog compound for cytochrome P-450
Full text linkThis thesis describes a Mossbauer effect and electron
paramagnetic resonance study of iron (III) tetraphenylporphyrinatobenzenethiolate
benzene thiol, an analog compound
for bacterial cytochrome P-450. The compound is unusual in
that it provides a model for the two ferric reaction states
of cytochrome P-450. The iron in the model compound exhibits
a gradual low spin to high spin transition over the
temperature range 77 to 300 K.
Mossbauer spectra for several samples shows that the
material, as prepared, consists of at least two species.
At 4.2 K the Mossbauer pattern consists of a superposition
of two low spin quadrupole doublets (ΔE₁. = 0.282 cm/sec,
δ₁ = 0.038 cm/sec, ΔE₁ = 0.175 cm/sec, δ₂ = 0.053 cm/sec).
The quadrupole splitting, ΔE₂, of the first component was
broadened by paramagnetic hyperfine structure and has been
described here by a model relaxation calculation. The EPR
spectra at 4.2 K for the two low spin components were
similar and could not be resolved from data for polycrystalline
samples. The g tensor at 4.2 K is 2.363, 2.240,
1.965. As temperature is increased both these low spin
components interconvert to a high spin species with Tc,₁
near 120 K and T
c,₂ near 225 K. The Mossbauer and EPR data
for the model compound are compared with similar data for
the bacterial cytochrome P450 as reported by Gunsalas and
co-workers. The data presented here are consistent with
the results from other model compounds that contain sulfur
as one of the axial ligands and which indicate probable
sulfur ligation in the low spin ferric reaction state of
cytochrome P450
M. Patrick Graham & Steven L. McKenzie (ed.), The Chronicler as Author. Studies in Text and Texture, Sheffield, Sheffield Academic Press, 1999, (Journal for the Study of the Old Testament, Supplement Series, 263), ISBN 1-84127-057-1
No full textRobert Philippe de. M. Patrick Graham & Steven L. McKenzie (ed.), The Chronicler as Author. Studies in Text and Texture, Sheffield, Sheffield Academic Press, 1999, (Journal for the Study of the Old Testament, Supplement Series, 263), ISBN 1-84127-057-1. In: Revue d'histoire et de philosophie religieuses, 80e année n°2, Avril-juin 2000. p. 297
Agricultural growth linkages in Ethiopia: Estimates using fixed and flexible price models
Full text link"Accelerating growth and poverty reduction, and the ultimate achievement of structural transformation, are the critical policy challenges in present day Ethiopia. This paper examines relevant growth options in terms of their impact on overall growth and poverty reduction in the country. It deploys a fixed-price semi-input-output model and a flexible-price economy-wide multi-market model for that purpose. The paper finds that agricultural growth can induce higher overall growth and faster poverty reduction than non-agricultural growth, although the latter can also have large growth effects in some cases. Among sub-sectors within agriculture, staple crops have stronger growth linkages. Decomposition of these effects also reveals that consumption linkages are much stronger than production linkages, i.e., the impact of increased consumption demand due to growth (agricultural and non-agricultural) is much larger than that of the corresponding expansion in input demand. Moreover, non-agricultural sectors have to grow in order to match growing supply of agricultural products and increasing demand for non-agricultural products. Otherwise, falling relative prices of agricultural products may dampen the realized gains in growth and poverty reduction." from Authors' AbstractPoverty reduction, Agricultural growth, Linkages, Staple food crops, non-agricultural sector, agricultural products, Prices,
Effect of Ramping-Up Rate on Film Thickness for Spin-On Processing
No full textSpin-on processing is used in many industries to deposit very thin coatings on flat substrates, including silicon wafers, flat-panel displays, and precision optical components. A liquid precursor solution is first dispensed onto the surface of the substrate; this fluid then spreads out very evenly over the surface due to large rotational forces caused by spinning of the substrate. When looking for an optimum coating procedure process engineers can adjust many variables including the peak spin speed, the ramping rate to reach that speed, the spinning time, as well as allowing for dynamic solution dispense before ramping up, though most protocols focus on the peak spin speed as the primary controlling variable. Engineers often construct spin-speed versus thickness correlations that enable predictable adjustment of spin-speed to achieve a desired thickness. Yet, rather little attention has been paid to the importance of the acceleration rate used to reach the desired peak speed. We show here that ramping rate is also important in helping establish the final coating thickness. We present a numerical model of the fluid flow on a spinning wafer when the spin-speed is ramping linearly up to a desired peak speed and then held constant. It is shown that the coating may “set” into its final thickness before the spin-speed reaches its peak value. In these cases then the peak spin-speed parameter is no longer the primary variable that defines the final coating thickness. This also impacts the interpretation of critical exponents found when fitting spin-speed vs. thickness data. We perform parallel experimental measurements for different ramping-up times and confirm the results from the numerical model. Both experimental and theoretical results support use of the simplified model put forth by Meyerhofer over 25 years ago (J. Appl. Phys. 49 (1978) 3993-3997).This is the Author's accepted manuscript of an article published in Journal of Materials Science: Materials in Electronics. The final publication is available at Springer via http://dx.doi.org/10.1007/s10854-005-4973-6Peer reviewe
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