Browsing Research Output by Title

Now showing items 13419-13438 of 13460

    • X-ray and gamma-ray polarization in leptonic and hadronic jet models of blazars 

      Zhang, H.; Böttcher, M. (IOP Science, 2013)
      We present a theoretical analysis of the expected X-ray and γ-ray polarization signatures resulting from synchrotron self-Compton emission in leptonic models compared to the polarization signatures from proton synchrotron ...

    • X-ray and gamma-ray variability of NGC 1275 

      Chitnis, Varsha; Chandra, Sunil; Shukla, Amit; Singh, K.P.; Jayashree, Roy (MDPI, 2020)
      Gamma-ray emission from the bright radio source 3C 84, associated with the Perseus cluster, is ascribed to the radio galaxy NGC 1275 residing at the centre of the cluster. Study of the correlated X-ray/gamma-ray emission ...

    • X-ray diffraction parameters and reaction rate modeling for gasification and combustion of chars derived from inertinite-rich coals 

      Everson, Raymond C.; Okolo, Gregory N.; Neomagus, Hein W.J.P.; Dos Santos, Jaen-Mari (Elsevier, 2013)
      An investigation was undertaken to determine the effect of carbon structural properties on the reactivity of chars derived from inertinite-rich coal. The structures of chars were characterized by X-ray diffraction and ...

    • X-ray polarimetry with the Polarization Spectroscopic Telescope Array (PolSTAR) 

      Krawczynski, Henric S.; Böttcher, Markus; Stern, Daniel; Harrison, Fiona A.; Kislat, Fabian F. (Elsevier, 2016)
      This paper describes the Polarization Spectroscopic Telescope Array (PolSTAR), a mission proposed to NASA’s 2014 Small Explorer (SMEX) announcement of opportunity. PolSTAR measures the linear polarization of 3–50 keV ...

    • Xenobiotic/medium chain fatty acid: CoA ligase - a critical review on its role in fatty acid metabolism and the detoxification of benzoic acid and aspirin 

      Van der Sluis, Rencia; Erasmus, Elardus (Taylor & Francis, 2016)
      Introduction: Activation of fatty acids by the acyl-CoA synthetases (ACSs) is the vital first step in fatty acid metabolism. The enzymatic and physiological characterization of the human xenobiotic/medium chain fatty acid: ...

    • Xenopus laevis as UberXL for nematodes 

      Schoeman, Anneke L.; Joubert, Tracy-Lee; Du Preez, Louis H.; Svitin, Roman (Taylor & Francis, 2020)
      The effect of invasive species on local parasite dynamics is often overlooked. The African Clawed Frog Xenopus laevis (Daudin, 1802) (Anura: Pipidae) is a global invader, with established populations on four continents and ...

    • The y-ray spectrum of the core of Centaurus A as observed with H.E.S.S. and Fermi-LAT 

      Abdalla, H.; Barnard, M.; Böttcher, M.; Garrigoux, T.; Ivaschenko, A.; Krüger, P.P.; Ndiyavala, H.; Pekeur, N.W.; Seyffert, A.S.; Spanier, F.; Sushch, I.; Van der Walt, D.J.; Van Rensburg, C.; Venter, C.; Wadiasingh, Z.; Zacharias, M.; H.E.S.S. Collaboration; Fermi LAT (EDP Sciences, 2018)
      Centaurus A (Cen A) is the nearest radio galaxy discovered as a very-high-energy (VHE; 100 GeV–100 TeV) γ-ray source by the High Energy Stereoscopic System (H.E.S.S.). It is a faint VHE γ-ray emitter, though its VHE flux ...

    • Yahweh’s ‘lord’ and unrestrained evil: an Exegesis of Psalm 110 

      Persaud, Aran J.E. (AOSIS, 2015)
      This article consists of an exegetical investigation of Psalm 110 and assumes that the psalms function in one sense as prayers, which can be prayed authentically by modern worshippers. Consequently, the specific images of ...

    • The year of jubilee: a hermeneutic for social and moral transformation in South Africa 

      Barry, Stephen (AOSIS, 2011)
      This article aims to show that the Old Testament concept of the year of jubilee is neither an anachronistic, nor a peripheral de- tail of Scripture. It is an integral part of it and indeed one her- meneutical tool for ...

    • Yeats's manuscripts and authorial intention. 

      Meihuizen, Nicholas (Taylor & Francis, 2014)
      The undermining of authorial intention through intertextuality and its consequent implications can sometimes lead to false assumptions about, not simply the meaning of texts, but the strategies used by authors in conveying ...

    • Yeats, Vendler, and Byzantium 

      Meihuizen, Nicholas (Edinburgh University Press, 2014)
      Helen Vendler, in her magisterial Our Secret Discipline: Yeats and Lyric Form (2007), provides us with the tools with which to register the traditional formal elements of poetry, and she does so for the most part with her ...

    • Yeats’s manuscripts and authorial intention. 

      Meihuizen, Nicholas (Taylor & Francis, 2014)
      The undermining of authorial intention through intertextuality and its consequent implications can sometimes lead to false assumptions about, not simply the meaning of texts, but the strategies used by authors in conveying ...

    • Yes/No/Maybe: a boolean attempt at feedback 

      Louw, H.; Van Rooy, B. (South African Association for Language Teaching (SAALT), 2010)
      This paper describes an experiment in which Boolean feedback (a kind of checklist) was used to provide feedback on the paragraph structures of first year students in an Academic Literacy course. We begin by introducing the ...

    • Yes/No/Maybe: A Boolean attempt at feedback 

      Henk Louw; Bertus van Rooy ((SAALT/SAVTO) South African Association of Language Teaching / Suid-Afrikaanse Vereniging vir Taalonderrig // Sabinet, 2010)
      This paper describes an experiment in which Boolean feedback (a kind of checklist) was used to provide feedback on the paragraph structures of first year students in an Academic Literacy course. We begin by introducing the ...

    • Yes/No/Maybe: A boolean attempt at feedback 

      Louw, Henk; Van Rooy, Albertus Jacobus (Africa Journals Online, 2010)

    • YHWH'S personal identity – a philosophical perspective 

      Gericke, J.W. (Unisa Press/SASNES (South African Society for Near Eastern Studies) / Sabinet, 2012)
      In this article a new riddle for Hebrew Bible theologians is introduced. It concerns the philosophical problem of YHWH's personal identity within the world in the text. Given theological pluralism in the deity's profile, ...

    • Yo-Yo Intermittent Recovery Test thresholds to determine positional internal match loads of semi-professional soccer players 

      Sparks, Martinique; Coetzee, Ben; Gabbett, J. Tim (Taylor & Francis, 2016)
      The aim of this study was to use heart rates and Yo-Yo Intermittent Recovery test level 1 (Yo-Yo IR1)-derived thresholds to determine the positional internal match loads of semi-professional soccer players. Players completed ...

    • 'You learn from going through the process': the perceptions of South African school leaders about action research 

      Wood, Lesley; Govender, Bernadette (SAGE, 2013)
      In South Africa, the under-resourced and socially challenging contexts in which the majority of schools function, calls for leadership that has the vision to look beyond seemingly insurmountable problems. South African ...

    • ‘You Were the (Divine) Cherub’: a potential challenge to Yhwh's Sole Divinity in Ezekiel 28.14 

      Lee, Lydia (Sage, 2016)
      According to the Masoretic vocalizations, Ezek. 28.14 directly identifies the king of Tyre as 'the anointed covering cherub'. Hector Patmore has recently suggested that the Masoretic vocalizations and accentuation produce ...

    • You, me, and meaning: an integrative review of connections between relationships and meaning in life 

      O’Donnell, Maeve B.; Bentele, Christof N.; Grossman, Hannah B.; Le, Yunying; Jang, Hoon; Steger, Michael F. (Taylor & Francis, 2014)
      Social relationships are seen to be vital to human functioning, both in terms of psychological functioning and physical health. Relationships are a cornerstone of well-being. For instance, having positive relationships has ...