Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 616-635 of 4825
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Cheap 0.36 dB broadband multipath LNA
(Institution of Engineering and Technology (IET), 2012)A two-path low-noise amplifier (LNA) designed for the planned MeerKAT radio telescope is presented. The LNA has a noise figure (NF) of less than 0.36 dB and input return loss of less than 12 dB from 0.7 to 1.8 GHz. It ... -
Chebyshev collocation method for the solution of a system of second-order boundary value problems
(SAS International Publications, 2016)In this paper, we present a new numerical approach based on Chebyshev polynomials of the first kind for solving a system of second-order boundary value problems associated with obstacle, unilateral and contact problems. ... -
Checklist of acanthocephalan parasites of South Africa
(Pensoft, 2018)Twenty-one species of acanthocephalans, representative of thirteen genera from ten families of seven orders and three classes, are included in this updated checklist of acanthocephalans in South Africa. Although South ... -
Chemical additives enhance the activity of a Bt‐based biopesticide targeting the beet webworm larvae
(Wiley, 2020)Spoladea recurvalis (Fbr.) (Lepidoptera: Crambidae) larvae can cause up to 100% foliage loss on amaranths during severe outbreaks. The Bacillus thuringiensis Subsp. kurstaki product Halt® is a biologically safe biopesticide ... -
Chemical and physical characterization of spent coffee ground biochar treated by a wet oxidation method for the production of a coke substitute
(Elsevier, 2020)Coke production relies on the availability, cost and quality of coking coal. Depleting coking coal resources and environmental pressure force the metallurgical industry to search for alternative methods to produce coke. ... -
Chemical and structural characterization of char development during lignocellulosic biomass pyrolysis
(Elsevier, 2017)The chemical and structural changes of three lignocellulosic biomass samples during pyrolysis were investigated using both conventional and advanced characterization techniques. The use of ATR-FTIR as a characterization ... -
Chemical Composition and Dry Matter Yield of Cowpea (Vigna unguiculate L Walp) Haulms as Fodder for Ruminants
(Kamla-Raj, 2016)The purpose of the study was to determine chemical composition and dry matter yield of cowpea haulms (Sejwaleng, Lebudu and Morathathane) grown in Limpopo Province, South Africa. Randomized complete block design was used ... -
The chemical composition and fluxes of atmospheric wet deposition at four sites in South Africa
(Elsevier, 2016)South Africa is the economic hub of southern Africa and is regarded as an important source region of atmospheric pollutants. A nitrogen dioxide (NO2) hotspot is clearly visible from space over the South African Mpumalanga ... -
Chemical composition, main sources and temporal variability of PM1 aerosols in southern African grassland
(EGU, 2014)Southern Africa is a significant source region of atmospheric pollution, yet long-term data on pollutant concentrations and properties from this region are rather limited. A recently established atmospheric measurement ... -
Chemical composition, nitrogen degradability and in vitro ruminal biological activity of tannins in vines harvested from four tropical sweet potato (Ipomoea batatas L.) varieties
(Wiley, 2016)This study investigated the potential of vines from four sweet potato varieties (Tia Nong 57, Tia Nong 66, Ligwalagwala and Kenya) as alternative feed resources for ruminant livestock. The chemical composition [neutral ... -
Chemical Evaluation of South African Prickly Pear Cladodes Varieties as Fodder for Ruminants Grown in Mara ADC, South Africa
(Kamla-Raj, 2016)The aim of the study was to determine the chemical composition of South African prickly pears cladodes varieties as fodder for ruminants in Mara ADC, South Africa. The experimental field was divided into four replications ... -
Chemical oxidative polymerization of m-phenylenediamine and its derivatives using aluminium triflate as a co-catalyst
(Elsevier, 2013)Aromatic diamine monomers, including m-phenylenediamine (mPD), 2-methyl-m-phenylenediamine (2Me-mPD), 4-methyl-m-phenylenediamine (4Me-mPD) and trimethyl-mphenylenediamine (tMe-mPD), were polymerized by chemical oxidation ... -
Chemical toxicity of surface-based drinking water sources due to natural uranium pollutant around Princess Gold Mine Environs in Roodepoort, South Africa
(Springer, 2016)The activity level of natural uranium pollutant in surface-based water around Princess Gold Mine in Roodepoort, South Africa was measured using inductively coupled plasma mass spectrometry. The highest activity level of ... -
Chemically oxidative polymerization of aromatic diamines: the first use of aluminium-triflate as a co-catalyst
(Elsevier, 2013)Aromatic diamine monomers, including o-phenylenediamine (oPD), p-phenylenediamine (pPD), 4,4′-diaminodiphenylenemethane (DADPM) and benzidine (BZN), were polymerized by chemical oxidation using sodium persulfate, potassium ... -
Chemoprotective properties of rooibos (Aspalathus linearis), honeybush (Cyclopia intermedia) herbal and green and black (Camellia sinensis) teas against cancer promotion induced by fumonisin B1 in rat liver
(Elsevier, 2009)The chemoprotective properties of unfermented and fermented rooibos (Aspalathus linearis) and honeybush (Cyclopia intermedia) herbal teas, and green and black teas (Camellia sinensis) were investigated against fumonisin ... -
Chicken diseases and their ethno-botanical treatments among the rural poor in southern Zambia, Africa
(Fundación CIPAV, Cali, Colombia, 2017)Village chicken production is widespread among rural farmers in Zambia because such chickens provide immediate proteins and cash to poor rural communities. Furthermore village chickens are very resistant to common diseases ... -
Chimaeric virus-like particles derived from consensus genome sequences of human rotavirus strains co-circulating in Africa
(PLOS, 2014)Rotavirus virus-like particles (RV-VLPs) are potential alternative non-live vaccine candidates due to their high immunogenicity. They mimic the natural conformation of native viral proteins but cannot replicate because ... -
Chitosan composite biomaterials for bone tissue engineering: a review
(Springer, 2020)The bone is a highly dynamic tissue with the remarkable ability to remodel and is in a continuous cycle of resorption and renewal as a result of internal mediators and external mechanical demands. Researchers have doubled ... -
Chlorinated, brominated and fluorinated organic pollutants in African Penguin eggs: 30 years since the previous assessment
(Elsevier, 2015)The African Penguin population has drastically declined over the last 100 years. Changes in food availability due to over-fishing and other oceanographic changes seem to be major causes. However, it has also been 30 years ... -
Chlorinated, brominated, and fluorinated organic pollutants in Nile crocodile eggs from the Kruger National Park, South Africa
(Elsevier, 2014)Repeated annual episodes of Nile crocodile deaths in two isolated areas of the Kruger National Park prompted the investigation of possible organohalogen pollutant involvement. Crocodile eggs were collected close to one of ...