Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 1216-1235 of 4825
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Discovery of very high energy gamma-ray emission coincident with molecular clouds in the W 28 (G6.4-0.1) field
(EDP Sciences, 2008)Aims. Observations of shell-type supernova remnants (SNRs) in the GeV to multi-TeV γ-ray band, coupled with those at millimetre radio wavelengths, are motivated by the search for cosmic-ray accelerators in our Galaxy. The ... -
Discovery of very high energy y-ray emission from Centaurus A with HESS.
(IOP Publishing, 2009)We report the discovery of faint very high energy (VHE; E > 100 GeV) γ-ray emission from the radio galaxy Centaurus A in observations performed with the High Energy Stereoscopic System (H.E.S.S.) experiment, an imaging ... -
Discovery of very high energy γ-ray emission from the BL Lacertae object PKS 0301-243 with H.E.S.S.
(EDP Sciences, 2013)The active galactic nucleus PKS 0301−243 (z = 0.266) is a high-synchrotron-peaked BL Lac object that is detected at high energies (HE, 100 MeV < E < 100 GeV) by Fermi/LAT. This paper reports on the discovery of PKS 0301−243 ... -
Discovery of very-high-energy gamma-ray emission from the vicinity of PSR J1913+1011 with HESS
(EDP Sciences, 2008)The HESS experiment, an array of four Imaging Atmospheric Cherenkov Telescopes with high sensitivity and large field-of-view, has been used to search for emitters of very-high-energy (VHE, >100 GeV) $\gamma$-rays along the ... -
Discovery of VHE emission towards the Carina arm region with the H.E.S.S. telescope array: HESS J1018-589
(EDP Sciences, 2012)The Carina arm region, containing the supernova remnant SNR G284.3–1.8, the high-energy (HE; E > 100 MeV) binary 1FGL J1018.6–5856 and the energetic pulsar PSR J1016–5857 and its nebula, has been observed with the H.E.S.S. ... -
Discovery of VHE gamma-rays from the high-frequency-peaked BL Lacertae object RGB J0152+017
(EDP Sciences, 2008)Aims. The BL Lac object RGB J0152+017 (z=0.080) was predicted to be a very high-energy (VHE; >100 GeV) $\gamma$-ray source, due to its high X-ray and radio fluxes. Our aim is to understand the radiative processes by ... -
Discovery of VHE y-ray emission and multi-wavelength observations of the BL Lacertae object 1RXS J101015.9-311909
(EDP Science, 2012)1RXS J101015.9 − 311909 is a galaxy located at a redshift of z = 0.14 hosting an active nucleus (called AGN) belonging to the class of bright BL Lac objects. Observations at high (HE, E > 100 MeV) and very high (VHE, E > ... -
Discovery of VHE y-rays from the BL Lacertae object PKS 0548-322
(EDP Sciences, 2010)Aims. PKS 0548-322 (z=0.069) is a "high-frequency-peaked'' BL Lac object and a candidate very high energy (VHE, E >100 GeV) $\gamma$-ray emitter, due to its high X-ray and radio flux. Observations at the VHE band provide ... -
Discrete Morrey spaces and their inclusion properties
(Wiley, 2018)We discuss discrete Morrey spaces and their generalizations, and we prove necessary and sufficient conditions for the inclusion property among these spaces through an estimate for the characteristic sequences -
The discrete twofold Ellis–Gohberg inverse problem
(Elsevier, 2017)In this paper a twofold inverse problem for orthogonal matrix functions in the Wiener class is considered. The scalar-valued version of this problem was solved by Ellis and Gohberg in 1992. Under reasonable conditions, the ... -
Discussing the future of amphibians in research
(Nature, 2019)Amphibians have been used as experimental organisms for centuries. Recent years have seen a renewed interest in amphibians as models of human development and disease and an urgent need to understand and mitigate the impacts ... -
Discussion of “Industrial statistics: the challenges and the research”
(Taylor & Francis, 2016)Firstly, we want to congratulate David M. Steinberg on a well-thought-out and thought-provoking article. Steinberg's article provides a balanced though critical review of the current state of research in industrial ... -
Disseminating genetically modified (gm) maize technology to smallholder farmers in the Eastern Cape province of South Africa: extension personnel's awareness of stewardship requirements and dissemination practices
(2016)Advice and technical information from extension services are critica l in promoting new technologies and their adoption by farmers. This study determined extension personnel’s awareness of GM ... -
Dissipative particle dynamics investigation of the transport of salicylic acid through a simulated in vitro skin permeation model
(MDPI, 2018)Permeation models are often used to determine diffusion properties of a drug through a membrane as it is released from a delivery system. In order to circumvent problematic in vivo studies, diffusion studies can be ... -
Dissolution kinetics of silver nanoparticles : behaviour in simulated biological fluids and synthetic environmental media
(Elsevier, 2022)Silver nanoparticles offer a wide range of benefits including their application in several fields such as medical, food, health care, consumer, and industrial purposes. However, unlocking this potential requires a ... -
Dissolution of titanium dioxide nanoparticles in synthetic biological and environmental media to predict their biodurability and persistence
(Elsevier BV, 2022)Investigating the biodurability and persistence of titanium dioxide nanoparticles (TiO2 NPs) is of paramount importance because these parameters influence the particles' impact on human health and the environment. Contrary ... -
Distance moduli of open cluster NGC 6819 from Red Giant Clump stars
(Elsevier, 2016)In this paper we study Kepler open cluster NGC 6819 using Kepler data of Red Giant Clump (RGC) single member (SM) stars. The Kepler data spans a period of 4 years starting in 2009. In particular, we derive distance moduli ... -
A distributed approach to speech resource collection
(Pattern recognition association of South Africa (PRASA), 2013)We describe the integration of several tools to enable the end-to-end development of an Automatic Speech Recognition system in a typical under-resourced language. Google App Engine is employed as the core environment for ...