Browsing Faculty of Natural Sciences by Title
Now showing items 875-894 of 2567
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Fitting sinusoids to observations of rotating spotted stars
(Oxford University Press, 2007)It is assumed that K blocks (e.g. seasons) of observations are available, and the parameters characterizing a fixed-frequency sinusoidal variability (mean light level, amplitude, phase) are constant within each of the ... -
Flavonoid and phenolic acid profiles of dehulled and whole vigna subterranea (l.) Verdc seeds commonly consumed in South Africa
(MDPI, 2022)Bambara groundnut (BGN) is an underexploited crop with a rich nutrient content and is used in traditional medicine, but limited information is available on the quantitative characterization of its flavonoids and phenolic ... -
A flexible method for estimating luminosity functions via Kernel Density Estimation
(IOP Publishing, 2020)We propose a flexible method for estimating luminosity functions (LFs) based on kernel density estimation (KDE), the most popular nonparametric density estimation approach developed in modern statistics, to overcome ... -
The flexible, extended coil of the pdz-binding motif of the three deadly human coronavirus e proteins plays a role in pathogenicity
(MDPI, 2022)The less virulent human (h) coronaviruses (CoVs) 229E, NL63, OC43, and HKU1 cause mild, self-limiting respiratory tract infections, while the more virulent SARS-CoV-1, MERS-CoV, and SARS-CoV-2 have caused severe outbreaks. ... -
Floor control arbitration for a hybrid voice/text web-board
(Telkom, 2003)We have built a hybrid voice/text web–board that utilizes floor control for handling resources such as microphone and interface events. The aim of this research is to determine the most appropriate floor control mechanism ... -
Fly ash-based geopolymer building materials for green and sustainable development
(MPDI, 2020)This study reports on formulations and conditions for producing fly ash-based geopolymers with a view to showing that the compressive strength required for construction applications can be obtained without the addition of ... -
The fore ground transfer function for H I intensity mapping signal reconstruction: MeerKLASS and precision cosmology applications
(Oxford University Press, 2023)Blind cleaning methods are currently the preferred strategy for handling foreground contamination in single-dish H I intensity mapping surv e ys. Despite the increasing sophistication of blind techniques, some signal loss ... -
Foreground contamination in Lyα intensity mapping during the epoch of reoinization
(IOP Science, 2014)The intensity mapping of Lyα emission during the epoch of reionization will be contaminated by foreground emission lines from lower redshifts. We calculate the mean intensity and the power spectrum of Lyα emission at z ... -
Foreground modelling via Gaussian process regression: an application to HERA data
(Oxford University Press, 2020)The key challenge in the observation of the redshifted 21-cm signal from cosmic reionization is its separation from the much brighter foreground emission. Such separation relies on the different spectral properties of the ... -
Forensic parameters and genetic structure based on Y-chromosome short tandem repeats in Lesotho populations
(Forensic Science International: Genetics Supplement Series, 2019)Lesotho is a landlocked country with approximately 2.2 million inhabitants. Over 97% of the population is represented by the Southern Sotho people (Sotho-Tswana group), followed by a number of minorities mostly from the ... -
Forensic science international: genetics supplement series
(ScienceDirect, 2019)We have designed a buffer for preservation of DNA in biological material at room temperature. In this work we evaluated the integrity of DNA from saliva, stored for 4 years and blood stored for 4 months at room temperature. ... -
Forest canopy gaps offer a window into the future: The case of subtropical coastal forests within an urban matrix in South Africa
(INST NACIONAL INVESTIGACION TECHNOLOGIA AGRARIA ALIMENTARIA, 2021)Alien and indigenous species emergence patterns within canopy gaps in urban subtropical forests are poorly understood. This study compared canopy gap floristics in relation to abiotic and physical characteristics across ... -
Foreword to special section: groundwater in Africa
(Wiley-Blackwell, 2010) -
Forming the Moon from terrestrial silicate-rich material
(Elsevier, 2013)Recent high-precision measurements of the isotopic composition of lunar rocks demonstrate that the bulk silicate Earth and the Moon show an unexpectedly high degree of similarity. This is inconsistent with one of the ... -
The “four sigma” limit for significant periodicities
(Springer Verlag, 2010)Most of the pulsations which have been observed in sdB stars have very low amplitudes. Detection of modes from photometric observations is usually performed by noting the most prominent peaks in a periodogram or, ... -
Fracture development and fractal characteristics of overburden rock under repeated mining
(Spinger, 2021)The purpose of this paper is to provide scientific basis for the stability evaluation of overburden rock of repeated mining goaf under the expressway. The objectives of the present study are to reveal the development of ... -
FRAGS: Estimation of coding sequence substitution rates from fragmentary data
(BMC, 2004)Rates of substitution in protein-coding sequences can provide important insights into evolutionary processes that are of biomedical and theoretical interest. Increased availability of coding sequence data has enabled ... -
A framework and toolkit for the collection and analysis of QoS statistics for voice traffic in Next Generation Networks
(Telkom, 2000)The multi-service, multi-architecture nature of NGNs is so complex that the management of services, in addition to networks, emerges as a research challenge. Despite QoS limitations, VoIP (as opposed to VoATM), dominates ... -
A framework and toolkit for the collection and analysis of QoS statistics for voice traffic in Next Generation Networks
(Telkom, 2000)The multi-service, multi-architecture nature of NGNs is so complex that the management of services, in addition to networks, emerges as a research challenge. Despite QoS limitations, VoIP (as opposed to VoATM), dominates ... -
A framework for assessing the performance of pulsar search pipelines
(Oxford Unviersity Press, 2016)In this paper, we present a framework for assessing the effect of non-stationary Gaussian noise and radio frequency interference (RFI) on the signal to noise ratio, the number of false positives detected per true positive ...