Browsing by Title
Now showing items 7053-7072 of 35422
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Determination and the no-free-lunch paradox
(MIT Press, 2011)We discuss the no-free-lunch NFL theorem for supervised learning as a logical paradox—that is, as a counterintuitive result that is correctly proven from apparently incontestable assumptions. We show that the uniform prior ... -
Determination of a safe distance for atomic hydrogen depositions in hot-wire chemical vapour deposition by means of CFD heat transfer simulations
(Tech Science Press, 2020)A heat transfer study was conducted, in the framework of Computational Fluid Dynamics (CFD), on a Hot-Wire Chemical Vapour Deposition (HWCVD) reactor chamber to determine a safe deposition distance for atomic hydrogen ... -
Determination of antibiotic residues in fish sold in the supermarkets around Mafikeng, North West Province
(North-West University (South Africa), 2019)Aquaculture production has grown in the past decade, leading to a concurrent substantial growth in the use of antibiotics by the industry. The primary aim of this study was to determine antimicrobial residue levels of ... -
Determination of coal mine impacts on surface water bodies (Olifants River)
(North-West University (South Africa), 2019)The purpose of the study was to determine the impact of a coal mine on the water quality quaternary catchment B11J. The study area is situated in quaternary catchment B11J of the Olifants Water Management Area. The objectives ... -
Determination of Corrosion Inhibition Efficiency Using HPHT Autoclave by Gingko biloba on Carbon Steels in 3.5% NaCl solution Saturated with CO2
(ESG, 2014)Leaves extract of Gingko biloba (GBE) was characterized using mass spectrometry (MS) and Fourier transform infrared spectroscopy (FTIR) methods. The influence of GBE on corrosion of carbon steels (J55,N80, P110SS and C110 ... -
The determination of dioxin-like POPs in sediments and fish of the Vaal Triangle region, Gauteng, South Africa
(North-West University, 2006)Water resources in South Africa are scarce, and should therefore be protected against pollutants, also from persistent organic pollutants (POPs). This is emphasised by the Stockholm Convention on POPs, which aims at ... -
Determination of factors that influence reproductive conditions in cows in the rural farms of the Ngaka Modiri Molema District of the North West Province
(Kamla-Raj, 2016)Reproductive disorders in communal farming remain answerable to economic losses and poor reproductive performance. The aim of this study was to identify factors that influence the prevalence of reproductive conditions in ... -
Determination of fatigue characteristics of NBG18 graphite
(North-West University, 2007)The topic of this research thesis is the determination of the fatigue characteristics of NBG18 graphite, which is the preferred material for the graphite structures of a high temperature gas-cooled nuclear reactor (HTR). ... -
The determination of flow and habitat requirements for selected riverine macroinvertebrates
(North-West University (South Africa), Potchefstroom Campus, 2016)The focus of the Department of Water and Sanitation (DWS) has changed from one which addresses the quality and quantity of water resources in isolation to one which integrates these attributes with that of aquatic ecosystem ... -
Determination of lovastatin, mevastatin, rosuvastatin and simvastatin with HPLC by means of gradient elution
(Avoxa, 2019)A novel HPLC method with UV detection was developed and validated in skin penetration (in vitro) studies to identify and quantify lovastatin, mevastatin, rosuvastatin and simvastatin. A Venusil XBP C18 (2), 150 x 4.6 mm, ... -
Determination of metal concentrations in vegetation, soil, dust, and water in the vicinity of a cement factory in North West province, South Africa
(North-West University, 2012)On a per capita basis, cement is the second most widely consumed product in the world and its demand is increasing globally due to population growth and urbanisation. Manufacturing plants produce cement kiln dust (CKD) ... -
Determination of mineral matter and elemental composition of individual macerals in coals from Highveld mines
(SAIMM, 2016)A number of conventional and advanced analytical techniques (proximate and ultimate analysis, low-temperature oxygen-plasma ashing, X-ray diffraction, X-ray fluorescence spectrometry, coal petrography, and light-element ... -
The determination of Mpumalanga's competitive economic sectors for effective export promotion
(North-West University, 2012)Research has shown that South African regions have been experiencing reasonable export growth, as well as growth in the gross domestic product (GDP), population and skills level. South Africa’s provinces have been experiencing ... -
Determination of nitosoamines by DP polarography and investigation of kinetics of electroreduction of N–Nitrosodimethylamine by voltammetric techniques
(2005)This study has two aspects. One concerns the development of a sensitive differential pulse polarographic (DPP) method and its use to conduct a preliminary study of natural waters to detect the presence of nitrosoamines, ... -
Determination of nuclear forensic signatures from lead ratios and REEs in uranium ore samples using ICP‐MS and LIBS
(North-West University (South Africa), 2021)The aim of this study was to determine nuclear forensic signatures from lead ratios and resolve rare earth elements (REE) signatures in uranium samples and water using inductively coupled plasma mass spectroscopy (ICP-MS) ... -
Determination of Orbital Parameters of Kepler Binary Stars Using Time-delay Method on 1646 Pulsatina δScuti Stars
(North-West University (South Africa), 2018)A binary system is a pair of stars that are held together in closed orbits around their common centre of gravity, under the influence of their mutual gravitation. The night sky presents a variety of double stars, ranging ... -
Determination of organic pollution in Phongola and Vaal Rivers, and the possible effects to wildlife—a comparison
(North-West University (South Africa), 2020)The aquatic environment is impacted by a wide range of anthropogenic activities, these include application of agricultural products like herbicides, insecticides and pesticides, and fertilisers; sewage; and industrial ... -
Determination of REE in uranium bearing-material for nuclear forensics purposes using ICP-MS
(North-West University (South Africa), 2023)Nuclear forensics is a scientific discipline that focuses on nuclear or radioactive material and aims to provide information on the intended use, history, and even origin of the material. It examines and evaluates the ... -
Determination of salivary efavirenz by liquid chromatography coupled with tandem mass spectrometry
(Elsevier, 2010)A novel and robust screening method for the determination of the non-nucleoside reverse transcriptase inhibitor, efavirenz (EFV), in human saliva has been developed and validated based on high performance liquid chromatography ... -
Determination of the factors affecting the food security status of households in Bophelong, South Africa
(Clute Institute [for academic research], 2013)This study investigates the food security status of households in the township of Bophelong, South Africa. The results are based on a household survey using questionnaires. A Logistic regression model was estimated based ...