Browsing Faculty of Natural Sciences by Title
Now showing items 2044-2063 of 2571
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Review: Acid mine drainage (AMD) in abandoned coal mines of Shanxi, China
(MDPI, 2020)Excessive exploitation and massive coal mine closures have brought about extensive goafs in Shanxi where 8780 coal mines have been abandoned in the last 20 years. Acid mine drainage (AMD) poses severe environmental impact ... -
Review: groundwater management and groundwater/surface-water interaction in the context of South African water policy
(Springer Verlag, 2011)Groundwater/surface-water interaction is receiv¬ing increasing focus in Africa due to its importance to ecologic systems and sustainability. In South Africa's 1998 National Water Act (NWA), water-use licenses, including ... -
Review: Groundwater recharge estimation in northern China karst regions
(SpringerLink, 2022)Reliable estimates of groundwater recharge are crucial for the groundwater resources evaluating and sustainable utilization plans formulating. To protect the precious karst groundwater resources, this paper critically ... -
Review: Groundwater resource potential and status of groundwater resource development in Ethiopia
(Springer Nature, 2019)The groundwater resources potential of Ethiopia is estimated to be about 40 billion cubic meters. Groundwater has been used as the main source of water supply since the 1970s for the main cities, towns and dispersed rural ... -
Review: Karst springs in Shanxi, China
(Springerlink, 2019)China is one of a few countries in the world where karst is intensively developed and karst water is heavily utilized as water supply sources. Shanxi is such a Province with the largest karst distribution in places in ... -
Reviewing evidence of marine ecosystem change off South Africa
(National Inquiry Services Centre, 2013)Recent changes have been observed in South African marine ecosystems. The main pressures on these ecosystems are fishing, climate change, pollution, ocean acidification and mining. The best long-term datasets are for trends ... -
Revised SWIRE photometric redshifts
(Oxford University Press, 2013)We have revised the Spitzer Wide-Area Infrared Extragalactic survey (SWIRE) Photometric Redshift Catalogue to take account of new optical photometry in several of the SWIRE areas, and incorporating Two Micron All Sky ... -
A revision of the genus Strongylodesma Lévi (Porifera: Demospongiae: Latrunculiidae) with descriptions of four new species
(Cambridge University Press, 2009)The sponge genus Strongylodesma is reviewed and redefined, and now accommodates eight closely related species. The type species of Strongylodesma Le´vi is redescribed and an additional two new species are described from ... -
Revisiting the [C ii]158𝝁��m line-intensity mapping power spectrum from the EoR using non-uniform line-luminosity scatter
(Oxford University Press, 2023)Detecting the line-intensity mapping (LIM) signal from the galaxies of the Epoch of Reionization is an emerging tool to constrain their role in reionization. Ongoing and upcoming experiments target the signal fluctuations ... -
Rhodolith bed discovered off the south African coast
(MDPI, 2020)Rhodolith beds have not previously been recorded in South Africa. A multidisciplinary research effort used remote sampling tools to survey the historically unexplored continental shelf off the Eastern Cape coast of South ... -
Risk factors of inconsistent condom use among sexually active youths: Implications for human immunodeficiency virus and sexual risk behaviours in Malawi
(SAGE, 2017)This study examines the risk associated with inconsistent use of condoms as a risk factor for human immunodeficiency virus/sexually transmitted infections (HIV/STIs) and sexual risk behaviours. The Malawi Demographic ... -
Risk factors of preterm delivery of low birth weight (plbw) in an African population
(Academic Journals, 2010)More than 20 million infants in the world (15.5% of all births) are born with low birth weight. Ninety-five percent of them are in developing countries. The objective of this study was to examine different factors which ... -
Risk factors of preterm delivery of low birth weight (plbw) in an African population
(Academic Journals, 2010)More than 20 million infants in the world (15.5% of all births) are born with low birth weight. Ninety-five percent of them are in developing countries. The objective of this study was to examine different factors which ... -
Ritalinic acid stimulates human sperm motility and maintains vitality in vitro
(Korean Society for Sexual Medicine and Andrology, 2020)To evaluate the in vitro impact of ritalinic acid (RA), a major metabolite of methylphenidate (drug to treat attention-deficit hyperactivity disorder), on sperm motility, vitality and oxidative stress. Materials and Methods: ... -
Riverine dominance of a nearshore marine demersal food web: evidence from stable isotope and C/N ratio analysis
(National Inquiry Services Centre (NISC), 2016)The Thukela Bank, KwaZulu-Natal, supports a diverse ecosystem and South Africa’s only prawn fishery. Oceanographic studies suggest riverine input is not important for the biology of this system, whereas biological studies ... -
A robust numerical solution to a time-fractional Black–Scholes equation
(Springer Nature, 2021)Dividend paying European stock options are modeled using a time-fractional Black–Scholes (tfBS) partial differential equation (PDE). The underlying fractional stochastic dynamics explored in this work are appropriate for ... -
A robust spectral method for pricing of American put options on zero-coupon bonds
(Global-Science Press, 2018)American put options on a zero-coupon bond problem is reformulated as a linear complementarity problem of the option value and approximated by a nonlinear partial differential equation. The equation is solved by an ... -
A robust spectral method for solving Heston’s model
(Springer Verlag, 2014)In this paper, we consider the Heston’s volatility model (Heston in Rev. Financ. Stud. 6: 327–343, 1993]. We simulate this model using a combination of the spectral collocation method and the Laplace transforms method. ... -
Role and merits of green based nanocarriers in cancer treatment
(MPDI, 2021)The use of nanocarriers for biomedical applications has been gaining interests from researchers worldwide for the delivery of therapeutics in a controlled manner. These “smart” vehicles enhance the dissolution and the ... -
Role of cytocentrifugation combined with nuclear fast picroindigocarmine staining in detecting cryptozoospermia in men diagnosed with azoospermia
(Seoul: Korean Society for Sexual Medicine and Andrology, 2022)Azoospermia is defined as the absence of spermatozoa in the pellet of a centrifuged semen sample. In fact, when a basic semen analysis fails to detect sperm in the ejaculate, there is still the possibility of detecting ...