1,958 research outputs found
Deep boundary current disintegration in Drake Passage
No full textThe fate of a deep boundary current that originates in the Southeast Pacific and flows southward along the continental slope of South America is elucidated. The current transports poorly ventilated water of low salinity (a type of Pacific Deep Water; PDW), into Drake Passage. East of Drake Passage, the boundary current breaks into fresh anticyclonic eddies, nine examples of which were observed in mooring data from December 2009 to March 2012. The observed eddies appear to originate mainly from a topographic separation point close to 60°W, have typical diameters of 20–60 km and accompanying Rossby numbers of 0.1–0.3. These features are likely to be responsible for transporting PDW meridionally across the ACC, explaining the near-homogenization of Circumpolar Deep Water properties downstream of Drake Passage. This mechanism of boundary current breakdown may constitute an important process in the Southern Ocean overturning circulation
The Effect of a Guided Aural Reinforcement Model on Perceived Improvement in Intonation of Middle School Trombone Players
No full textvii, 80 leaves. Advisor: C. David HarrisThe purpose of this study was to examine the effect of a guided aural reinforcement model on perceived improvement in intonation of middle school trombone players. Based on their responses to the Watkins-Farnum performance test and a
questionnaire, subjects were matched by grade-level equivalent-pairs and then assigned by rank-order to control and experimental groups.
All subjects taking part in the investigation were given a researcher-designed pretest to determine initial skill level of intonation performance. Following the pretest, all subjects received nine periods of instruction on trombone. The experimental group practiced with a pre-recorded guided aural intonation component as a part of each lesson instruction period. The control group received instruction which included, for this school district, a traditional method of learning intonation rather than the prerecorded guided aural intonation component. A researcher-designed posttest was administered to all subjects following the nine periods of instruction.
Pretests and posttests were recorded and later evaluated by a panel of experts. Reliability of coefficient tests and ANOVAs were used to determine inter-evaluator reliability. Results yielded a high degree of reliability among evaluators.
Statistical t-tests were used to determine significant (p=.05) differences between the
gain scores of students in the control and experimental groups. Results indicated no
significant gain score differences between the control and experimental groups on part I (unison test). Analysis of gain scores for part II (interval test) and part III (melodic test)
portions of the pretests/posttests revealed significant differences between the control
and experimental groups with regard to improvement in intonation performance. As a result of practice with the guided aural reinforcement model, the experimental group demonstrated improvement in intonation performance which was significantly greater than the control group. Additional research possibilities and educational implications have been included
Carbon Tariffs: Impacts on Technology Choice, Regional Competitiveness, and Global Emissions
No full textCarbon regulation is intended to reduce global emissions, but there is growing concern that such regulation may simply shift production to unregulated regions, potentially increasing overall carbon emissions in the process. Carbon tariffs have emerged as a possible mechanism to address this concern by imposing carbon costs on imports at the regulated region's border. Advocates claim that such a mechanism would level the playing field whereas opponents argue that such a tariff is anti-competitive. This paper analyzes how carbon tariffs affect technology choice, regional competitiveness, and global emissions through a model of imperfect competition between "domestic" (i.e., carbon-regulated) firms and "foreign" (i.e., unregulated) firms, where domestic firms have the option to offshore production and the number of foreign entrants is endogenous. Under a carbon tariff, results indicate that foreign firms would adopt clean technology at a lower emissions price than domestic producers, with the number of foreign entrants increasing in emissions price only over intervals where offshore foreign firms hold this technology advantage. Further, domestic firms would only offshore production under a carbon tariff to adopt technology strictly cleaner than technology utilized domestically. As a consequence, under a carbon tariff, foreign market share is non-monotonic in emissions price, and global emissions conditionally decrease. Without a carbon tariff, foreign share monotonically increases in emissions price, and a shift to offshore production results in a strict increase in global emissions.Carbon regulation; Carbon leakage; Technology choice; Imperfect competition
Improved strategies for variational calculations for helium
No full textThe aim of this work is to apply trial functions constructed from Hylleraas functions with three independent sets of nonlinear scale factors to variational calculations for helium and helium-like ions. The ground state and low-lying Rydberg energy levels of these ions have been calculated to several orders of magnitude greater accuracy than previous work in this area while using an equal, or in most cases, a reduced number of basis functions. Each of the three sectors of the basis set is found to describe a different scale of coordinate space corresponding to the asymptotic, intermediate, and close-ranged distances between particles. The incorporation of the third, close-ranged sector, allows the basis set to better model complex correlation effects between the nucleus and the two electrons in the atomic three-body problem. Optimization of the basis set parameters is achieved through standard variational techniques and the validity of the wave functions near the electron-nucleus and electron-electron coalescence points is tested using the Kato cusp conditions. The tripled basis set is also applied to the 1/ Z perturbation expansion as a case study. A multiple-precision package, MPFUN90 written by David H. Bailey, was used to alleviate numerical instabilities which arose for certain states.Dept. of Physics. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2004 .N57. Source: Masters Abstracts International, Volume: 43-01, page: 0225. Adviser: G. W. F. Drake. Thesis (M.Sc.)--University of Windsor (Canada), 2004
David F. Drake Sustainable Operations Management: An enduring stream or a passing fancy? Sustainable Operations Management: An enduring stream or a passing fancy?
No full textHydrometra adnexa Drake 1956
No full textHydrometra adnexa Drake, 1956 (Fig. 6) Description. Brachypterous male. BL—8.70; HL—2.70; ANT/POST—1.53/0.85; HW—0.11; ANT I—0.49; ANT II—0.89; ANT III—2.30, ANT IV—1.62; EYE—0.27; PL—1.36; PW—0.44; DIST1—0.50; DIST2—1.05; FORELEG: FEM—2.82; TIB—3.18; TAR I—0.17; TAR II—0.14; TAR III—0.22; MIDLEG: FEM—2.97; TIB— 3.26; TAR I—0.08; TAR II—0.27, TAR III—0.22; HINDLEG: FEM—3.57; TIB—3.12; TAR I—lost; TAR IIlost; TAR III—lost. Head wider near anterior and posterior ends, dark brown, becoming yellowish brown anteriorly and posteriorly (Fig. 6a); ventrally pale yellow on anterior portion and posteriorly to eyes, yellowish brown between eyes; dorsally without denticles; ventrally covered by several black denticles. Clypeus broad, yellowish brown, with anterior margin rounded (Fig. 6b). Eyes bright, reddish brown. Dorsal interocular groove darker than remainder of head, very shallow, shorter than eyes; ventral interocular groove concolorous with venter of head, shallow, shorter than eyes. Bucculae yellowish brown, rounded, not covering base of labium; labium brown, very long, reaching postocular region of head. Antennomere I yellow at base, dark brown towards apex; II brown; III–IV dark brown. Antennomere I wider than others, darker portion with many shining setae; II longer than I, with many shining setae; III very thin, curved, long; IV short, with shining setae longer than those of other articles. Pronotum brownish, with midline pale yellow through entire length, dissipating on anterior part of anterior lobe; a row of deep circular pits adjacent to anterior margin (Fig. 6c). Anterior lobe without black denticles; posterior lobe without row of pits on midline, several very shallow pits randomly distributed on sides of midline. Pleural region of thorax brown, without black denticles, with faint longitudinal pale stripe (Fig. 6d) extending to last abdominal segment. Pro-, meso- and metasterna pale yellow, with a few black denticles. Propleuron with 4 circular pits. All acetabula brown; proacetabulum with 2 pits anterior to cleft and 2 posterior to it; mesoacetabulum with 2 pits anterior to cleft and 3 posterior to it; metacetabulum with 6 pits. Wings brown, with dark brown veins, reaching base of abdominal mediotergite I. Legs long, thin, with a few scattered short setae. Coxae and trochanters pale yellow; femora yellowish; tibiae and tarsi brown. Abdominal mediotergites I–VI brown, shining, glabrous, without black denticles; VII–VIII dull, covered by very a few short black setae. Abdominal laterotergites dark brown with pale brown lateral margins, slightly elevated, lacking black denticles, with white spots on anterior edges. Abdominal sterna II–V pale yellowish, with a few black denticles; VI yellowish brown with a few shining long setae; VII brown with several shining long setae (Fig. 6 e–f). Abdominal segment VIII brown, cylindrical, ventrolaterally compressed in anterior portion; anterior portion with shining long setae very close to segment VII, dorsally ending in a short, sharp, robust, spine-like projection (Fig. 6f). Pygophore concolorous with rest of abdomen, with apex rounded, with shining short setae. Material examined. Colombia, Quindio: 1 brachypterous ♂, Quimbaya, Vereda El Laurel, Reserva La Montaña del Ocaso, 4°34'N 75°51'W, 1032 m. 19.iv.2007, M. Manrique col. (BIOUNAL); 1 brachypterous ♂, Quimbaya, Vereda El Laurel, Reserva La Montaña del Ocaso, 4°34'N 75°51'W, 1024 m. 21.iv.2007, F. Alvarado col. (UPTC); 1 brachypterous ♀, Calarcá, Vereda Pradera. 13.vii.2005, J. Cobos col. (UPTC); 1 brachypterous ♀, Tebaida, Vereda Alto Oso. 17.vii.2005, F. Molano col. (UPTC). Distribution. Colombia: Quindío (this work). Panama: Panama (Drake 1956). Note. The male of this species was previously unknown and we present here the first records from Colombia (Fig. 8).Published as part of Martínez, David Camilo, Galindo-Malagón, Ximena Alejandra, Molano, Fredy & Moreira, Felipe Ferraz Figueiredo, 2019, Descriptions, records, and key to the Hydrometra Latreille, 1796 (Hemiptera: Heteroptera: Hydrometridae) from Colombia, pp. 51-72 in Zootaxa 4577 (1) on pages 61-63, DOI: 10.11646/zootaxa.4577.1.3, http://zenodo.org/record/262859
Heme b in marine cyanobacteria and the (sub-) tropical North Atlantic
No full textHeme b is the iron containing prosthetic group to an important pool of iron proteins known as the hemoproteins. Hemoproteins are functionally diverse, playing key roles in photosynthetic and respiratory electron transfer (e.g. cytochrome b6f, photosystem II, cytochrome bc1) among other fundamental biological processes. Heme b is the most naturally abundant heme structure, but data regarding hemes in the marine environment are limited. An investigation has been conducted to improve our understanding of heme b abundance in marine organisms through laboratory monoculture studies of three marine cyanobacteria grown under varying total iron concentration. The unicellular cyanobacteria Synechococcus sp. WH7803 was examined under three total iron concentrations: 12 nmol L-1 (low), 120 nmol L-1 (medium) and 1200 nmol L-1 (high). The marine diazotrophs (i.e. nitrogen fixers) Crocosphaera watsonii (WH8501) and Trichodesmium erythraeum (IMS101) were studied under six total iron concentrations between 0 and 120 nmol L-1. Cultures were analysed for heme b, chlorophyll a, particulate organic carbon (POC) and particulate organic nitrogen (PON) concentration. Nitrogen fixation rates and biophysical measurements (Fv/Fm and ?PSII) were also obtained for diazotroph cultures. Field data regarding the concentration of heme b, chlorophyll a, POC and PON as well as nitrogen fixation rates were collected during two research cruises in the subtropical North Atlantic (STNA, D346) and tropical North Atlantic (TNA, D361); an oceanographic region known to demonstrate high nitrogen fixation rates and receive significant dust (iron) deposition from the Saharan and Sahel deserts of Western Africa.Cultures of Synechococcus sp. WH7803 showed evidence of iron stress at low iron treatments via reduced maximum growth rates (?max), total biovolume and chlorophyll a concentration. This was also reflected by a significant reduction in cellular heme b content per unit carbon (heme:C) at the lowest iron concentration. An estimated heme b requirement between 1.0 and 1.5 ?mol mol-1 C is proposed for Synechococcus sp. WH7803 in order to facilitate ?max. Chlorophyll a to heme b ratios (chl:heme) were significantly decreased in low iron cultures of Synechococcus sp. WH7803, suggesting b-type hemoproteins were conserved when iron stressed. Cultures of Crocosphaera and Trichodesmium were similarly influenced by the availability of iron, with reduced total biovolume and chlorophyll a concentration reported at low iron treatments. However, heme:C ratios were maintained at approximately 1.5 and 0.5 ?mol mol-1 C for Crocosphaera and Trichodesmium cultures, respectively. A high iron requirement is associated with marine diazotrophs relating to the iron-rich non-heme nitrogenase enzyme complex responsible for nitrogen fixation. Nitrogen fixation rates increased as total iron concentration increased, with Trichodesmium demonstrating four-fold higher rates than Crocosphaera at corresponding iron concentrations. It has been suggested that relatively low heme b contents of Trichodesmium cultures resulted from increased nitrogen fixation activity. Furthermore, heme:C ratios of Crocosphaera and Trichodesmium were typically lower than five eukaryotic phytoplankton previously investigated, potentially related to the allocation of iron for nitrogen fixation. Mean heme:C ratios from cruises in the STNA and TNA were 0.64 and 0.66 ?mol mol-1 C, respectively. Results could imply the region was iron stressed and/or dominated by cyanobacteria. Evidence is also presented suggesting a possible inverse relationship between nitrogen fixation and heme:C ratio in the TNA which could be attributed to natural populations of Trichodesmium
Iowa History and Culture : A Bibliography of Materials Published Between 1952 and 1986, 1989
No full textThis bibliography was compiled by two reference librarians, Patricia Dawson and David Hudson with the goal of making it easier of tracking down material on Iowa history and culture. This supplements the Iowa History Reference Guide published in 1952 by William Petersen
Plan Canada - Volume 27, Number 4 (June 1987)
No full textEditorial / David F. Brown -- Institute news|Affaires de l'Institut -- Municipal information systems: Challenges and opportunities / Ross T. Newkirk -- Computer-based tools for generalist planners / Henry Hightower -- Computer applications in planning: City of Calgary / Ernest H. Park & Pat Drake -- Computer applications in planning: City of Toronto / Alan Mitchell -- Do-it-yourself microcomputer software: Halifax / John Heseltine -- Institute report: CIP contributes to the Buildings Revival CoalitionSpecial issue: Computers and planning|Chronique speciale : Des ordinateurs et la planificationhttps://viurrspace.ca/bitstream/handle/10613/21909/PC.27.4.FULL.pdf?sequence=3Editorial / David F. Brown -- Institute news|Affaires de l'Institut -- Municipal information systems: Challenges and opportunities / Ross T. Newkirk -- Computer-based tools for generalist planners / Henry Hightower -- Computer applications in planning: City of Calgary / Ernest H. Park & Pat Drake -- Computer applications in planning: City of Toronto / Alan Mitchell -- Do-it-yourself microcomputer software: Halifax / John Heseltine -- Institute report: CIP contributes to the Buildings Revival Coalitio
The visceral screen: Between the cinemas of John Cassavetes and David Cronenberg, a Barthesian perspective
No full textThe thesis discusses two directors who are never considered together in academic discourse. Cassavetes’ perceived focus on events led by the dynamics of performance and his looseness of technique opposes the calculated compositions of the Cronenberg film, with its aesthetic of horrific images and its gallery of emotionally detached protagonists. Yet it is between such opposing methods of cinematic expression that the ineffable qualities of film aesthetics can be discovered. Cassavetes’ cinema achieves this by revelling in a surplus of activity that exceeds narrative, while the indescribable characteristics of the Cronenberg oeuvre is achieved through a systematic emptying of the image’s meaning through a simultaneous commitment to paring back emotion and portraying of images that are controversial and inconceivable. Taken together, the thesis identifies these aspects of film as ‘the visceral,’ a facet of the moving image that most certainly exists, but is resolutely, and disturbingly resistant to interpretation.
Roland Barthes’ writings are integral to a theory of the visceral. His re-evaluation of Saussurean semiology as a method of analyzing and undoing ideologically-imposed meanings informs readings of sequences from Cassavetes and Cronenberg’s films. Following Barthes, the thesis suggests that the existence of the visceral is realized as a resistance to ideological interpretations of the image, and so cannot be described. Ultimately, the inability of semiology to fully grasp certain aspects of the filmed image is put forward as a rejoinder to theories of the fiction film as principally a narrative medium
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