24,866 research outputs found

    The promise and practice of e-learning within complex tertiary environments

    Get PDF
    In advance of a change in learning management systems at a tertiary institution in New Zealand, the authors undertook a research study, the purpose of which was to provide a ‘snap-shot’ of existing online instructional practice within their School. They sought to identify existing pedagogical and technical issues and staff attitudes and preparedness for the new software. Although they found considerable staff good will toward e-learning, a number of problems were identified in the study. Findings from research have been organized and are discussed within five categories, including vision, skills, incentives, resources, and action plan. Conclusions describe plans for reorganizing how and in what manner e-learning can be supported within complex social environments, such as universities, when resources are limited

    Passively cooled glass CO2 laser tubes for severe environments

    Get PDF
    The objective of this effort was to design a glass CO2 laser tube that could survive the Titan 3 C launch environment and at the same time provide adequate thermal conductivity to maintain the wall of the laser tube below approximately equal to 50 C for efficient lasing. The approach that was taken to satisfy these requirements was to pot the tube in an aluminum heat sink using a space qualified polyurethane potting material. Two configurations of the laser tube successfully passed the complete Titan 3 C qualification level sine and random vibration specification and satisfied the thermal requirements. Fabrication details and test results are presented that indicate this could be a practical solution for laser tubes used in a severe environment and where flowing coolants are impractical or undesirable

    Potential utilization of scallop viscera for solid waste management and as feedstuff for swine

    Get PDF
    Waste management has been identified as a major problem which will threaten the economic security of Florida's seafood industry within the next ten years (1). One of the primary concerns is treatment and disposal of solid wastes resulting from seafood processing. Utilization of scallop viscera as silage, much like that developed for waste fish and fish offal (3,4), could represent a practical solid waste treatment option which offers the additional benefit of a protein feed supplement for production of swine. (27pp.

    “Measuring Silences” in the Translation of Awa Thiam\u27s La Parole aux Négresses

    Get PDF
    An overlooked, yet significant text in the genealogy of intersectionality and Black feminist theory is Awa Thiam’s 1978 text La Parole aux Négresses. This paper examines the ways that the English translation, Speak Out, Black Sisters: Feminism and Oppression in Black Africa,though widening the audience for Thiam’s work, engages in various practices of erasure that undermine Thiam’s academic authority, theoretical contributions, activist insights, and ultimately, her own voice. Namely, I contend that these practices, which scholars have linked to receptions and English translations of Black Francophone texts in particular, include de-formalization, domestication, de-philosophizing, untracing, and invisibilisation. I seek not just to focus on the “negative” aspect of these silences, but also to enact a partial restitution of Thiam’s insights from the original French text. Further, re-engaging with her text, contributions, and insights calls for more reflexivity around the politics of translation, English language hegemony, and recognition of African feminist scholarship

    Insights from the Outskirts: Chemical and Dynamical Properties in the outer Parts of the Fornax Dwarf Spheroidal Galaxy

    Full text link
    We present radial velocities and [Fe/H] abundances for 340 stars in the Fornax dwarf spheroidal from R~16,000 spectra. The targets have been obtained in the outer parts of the galaxy, a region which has been poorly studied before. Our sample shows a wide range in [Fe/H], between -0.5 and -3.0 dex, in which we detect three subgroups. Removal of stars belonging to the most metal-rich population produces a truncated metallicity distribution function that is identical to Sculptor, indicating that these systems have shared a similar early evolution, only that Fornax experienced a late, intense period of star formation (SF). The derived age-metallicity relation shows a fast increase in [Fe/H] at early ages, after which the enrichment flattens significantly for stars younger than ~8 Gyr. Additionally, the data indicate a strong population of stars around 4 Gyr, followed by a second rapid enrichment in [Fe/H]. A leaky-box chemical enrichment model generally matches the observed relation but does not predict a significant population of young stars nor the strong enrichment at late times. The young population in Fornax may therefore originate from an externally triggered SF event. Our dynamical analysis reveals an increasing velocity dispersion with decreasing [Fe/H] from sigma_sys 7.5 km/s to >14 km/s, indicating an outside-in star formation history in a dark matter dominated halo. The large velocity dispersion at low metallicities is possibly the result of a non-Gaussian velocity distribution amongst stars older than ~8 Gyr. Our sample also includes members from the Fornax GCs H2 and H5. In agreement with past studies we find [Fe/H]=-2.04+-0.04 and a mean radial velocity RV=59.36+-0.31 km/s for H2 and [Fe/H]=-2.02+-0.11 and RV=59.39+-0.44 km/s for H5. Overall, we find large complexity in the chemical and dynamical properties, with signatures that additionally vary with galactocentric distance.Comment: 21 pages, 18 figures, 4 tables, accepted for publication in A&

    Managing Feedlot Cattle to Reduce Nutrient Waste

    Get PDF
    Management opportunities can reduce feed costs and the cost of excess nutrient waste outputs. The key to controlling excess nutrient output is controlling nutrient intakes. The question becomes whether nutrient excretion can be reduced without negatively impacting animal performance