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Browsing Faculty of Natural Sciences@PUK by Title

Now showing items 271-290 of 543

Land-use suitability modelling as an input for spatial planning in Tlokwe local municipality, North-West province, South Africa

Cilliers, Dirk Petrus; Drewes, Johannes Ernst (Department of Urban and Regional Planning, University of the Free State, Bloemfontein, South Africa, 2010)
Laser induced and controlled chemical reaction of carbon monoxide and hydrogen

Strydom, Christiena Adriana; Du Plessis, Anton; Uys, Hermann; Botha, Lourens R. (American Institute of Physics, 2011)

Bimolecular chemical reaction control of gaseous CO and H2 at room temperature and atmospheric pressure, without any catalyst, using shaped femtosecond laser pulses is presented. High intensity laser radiation applied to ...
Latitudinal Gradients of galactic cosmic rays during the 2007 solar minimum

Heber, B; Ferreira, Stephanus; Potgieter, Marthinus S; Gieseler, J; Dunzlaff, P; Gómez-Herrero, R; Klassen, A; Müller-Mellin, R; Mewaldt, R A (IOP Publishing Limited, 2008)
Lessons from parasitic flatworms about evolution and historical biogeography of their vertebrate hosts

Du Preez, Louis; Verneau, Olivier; Badets, Mathieu (Elsevier Masson SAS, 2009)
Limits on energy dependence of the speede of light from a flare of the active galaxy PKs 2155-304

De Jager, Ocker; Raubenheimer, Barend; Venter, Christo; Holleran, Mathew; Busching, I; Aharonian, F (PubMed, 2008)
Linolenic acid and folate in wild-growing African dark leafy vegetables (morogo)

Van der Walt, Anna M; Loots, Du Toit; Bezuidenhout, Cornelius C; Ibrahim, Mohamed IM (Cambridge University Press, 2008)
The lion, the ape and the donkey: Cursory observations on the misinterpretaion and misrepresentation of environmental impact assessment (EIA) in the chronicles of Fuel Retailers

Retief, Francois; Kotzé, L J (Scottsville, South Africa : School of Law, University of Natal, 2008)
Localizing the VHE y-ray source at the Galactic centre

Aharonian, F; Raubenheimer, B C; Vincent, P; De Jager, Ocker Cornelis; Van Eldik, C; Vivier, M; Völk, H J; Hermann, G; Busching, Ingo; Hoffmann, A; Hofverberg, P; Venter, Christo (Wiley-Blackwell, 2010)
Long-term neutron monitor observations and the 2009 cosmic ray maximum

Moraal, Harm; Stoker, Pieter Helenius (American Geophysical Union, 2010)
Long term measurements of sulfur dioxide, nitrogen dioxide, ammonia, nitric acid and ozone in Africa using passive samplers

Adon, M; Ourabi, Al; Castera, P; Delon, C; Gardrat, E; Lavenu, F; Mougin, E; Pienaar, Jacobus Johannes; Sigha-Nkamdjou, L; Tathy, J P (Copernicus Publications, 2010)
Longitudinal variation of the pickup-proton-injection efficiency and rate at the heliospheric termination shock

Potgieter, Marthinus S; Ferreira, Stephanus E S; Fahr, H J; Scherer, K (EDP sciences, 2008)
Low equivalent weight short-side-chain perfluorosulfonic acid ionomers in fuel cell cathode catalyst layers

Bessarabov, Dmitri; Holdcroft, Steven; Lei, Chao; Navessin, Titichai; Xie, Zhong; Ye, Siyu (Elsevier, 2011)

The morphology and fuel cell performance of cathode catalyst layers (CCLs) using low equivalent weight (EW) short-side-chain (SSC) perfluorosulfonic acid ionomers have been investigated in this work. The results were ...
Magnetospheric electric field variations caused by storm-time shock fronts

Kokorowski, M; Stoker, Pieter; Moraal, Harm; Collier, A B; Smith, D M; Woodgerg, L (Elsevier Science Limited, 2008)
Malaria control Insecticide Residues in Breast Milk: The Need to Consider Infant Health Risks

Bouwman, Hindrik; Kylin, Henrik (PubMed Central, 2009)
Malgachebates peyrierasi n. gen., n. sp. (Acari: Oribatida: Plasmobatidae) from Madagascar

Theron, Pieter Daniel; Cleva, Régis; Fernandez, Nestor (Taylor & Francis, 2011)

Malgachebates peyrierasi n. gen. n. sp., collected from Ankarongambe Forest Station, Tamatave province, mid-eastern Madagascar, is described and illustrated based on adult specimens. The new genus is easily distinguishable ...
Maluti Mystery: A systematic review of Amietia vertebralis (Hewitt, 1927) and Strongylopus hymenopus (Boulenger, 1920) (Anura: Pyxicephalidae)

Du Preez, Louis H; Tarrant, Jeanne (Magnolia Press, 2008)

The taxonomic status of Amietia vertebralis and Strongylopus hymenopus, two frogs restricted to the Maluti-Drakensberg highlands in southern Africa, is unclear. Here, morphological examination and phylogenetic analyses ...
Manufacture and optimization of tubular ceramic membrane supports

Krieg, Henning; Bissett, Hertzog; Zah, J. (Elsevier Science Limited, 2008)
The meaning of place-making in planning: historical overview and implications for urban and regional planning

Roos, Vera; Puren, Karen; Jordaan, Tarina (University of the Free State, 2008)
Measurement of effective gas diffusion coefficients of catalyst layers of PEM fuel cells with a Loschmidt diffusion cell

Bessarabov, Dmitri; Shen, Jun; Zhou, Jianqin; Astrath, Nelson G.C.; Navessin, Titichai (Elsevier, 2011)

In this work, using an in-house made Loschmidt diffusion cell, we measure the effective coefficient of dry gas (O2–N2) diffusion in cathode catalyst layers of PEM fuel cells at 25 °C and 1 atmosphere. The thicknesses of ...
Measurements of aerosol charging states in Helsinki, Finland

Kulmala, M.; Laakso, L.; Vana, M.; Gagné, S.; Leppä, J.; Petäjä, T.; McGrath, M.J; Kerminen, V.-M. (Copernicus Publications, 2011)

The charging state of aerosol populations was measured with an Ion-DMPS in Helsinki, Finland between December 2008 and February 2010. Based on the charging states, we calculated the ion-induced nucleation fraction to be ...