List of Titles

Quick View

Dudu Pukwana-In the Township and District Six

- Cook, Richard

Authors: Cook, Richard
Subjects: McGregor, Chris--1936-1990 , Pukwana, Dudu , District Six , Abrahams, Brian , Jazz , Jazz musicians
Language: English
Type: Article
Identifier: vital:13521 , http://hdl.handle.net/10962/d1006098 , McGregor, Chris--1936-1990 , Pukwana, Dudu , District Six , Abrahams, Brian , Jazz , Jazz musicians
Description: Photocopied article from the newspaper The Sunday Times about 2 new recordings by Dudu Pukwana and Brian Abrahams' District Six.
Full Text:

Quick View

Education Methods - Handling complex information

- TUC Education

Authors: TUC Education
Subjects: TUC Education
Language: English
Type: text
Identifier: http://hdl.handle.net/10962/118229 , vital:34609
Description: This note looks briefly at a key problem confronting trade union educators: how to handle topics which involve complex information. There are several different parts to this problem: The range of topics facing trade union educators is immense, and growing all the time. Safety, pensions, compulsory tendering, new technology, the list seems to be endless. Trade union education must develop an approach that allows us to take all these and other issues on board in an effective and rational way. Many participants on trade union courses don't have highly- developed 'information skills', such as looking up a reference book, using an index, or gutting a document for key points. There is a shortage of tutors with detailed knowledge of complex topics, and Of subject experts with educational experience.
Full Text:

Quick View

Education Methods - Role playing

- TUC Education

Authors: TUC Education
Subjects: TUC Education
Language: English
Type: text
Identifier: http://hdl.handle.net/10962/118311 , vital:34616
Description: This note is a practical guide to what role playing is and how to do it on trade union courses. 'Role playing' is not just a method of education: it is something you do every day. One minute, you're a parent , seeing the kids off to school. Then you're off to work, and you're a driver, passenger, or pedestrian. Go to the branch meeting and you are a union activist. So in your daily life you take on a number of different roles, and get used to switching between them. Used properly, role plays can help you to run a lively, active, arid effective course. Role playing involves everyone, helps them to develop skills, and gives them practice in applying Information to problems. Because your course is a 'safe' environment where you do not pay a price for making n ml stake, a role play can give people confidence in trying out new ideas. So you could try to get participants to Improve the way they run union meetings; talk to members, management, or journal lets; or work on a negotiating team.
Full Text:

Quick View

Effect of bovine serum albumin and single walled carbon nanotube on the photophysical properties of zinc octacarboxy phthalocyanine

- Ogbodu, Racheal O, Nyokong, Tebello

Authors: Ogbodu, Racheal O , Nyokong, Tebello
Language: English
Type: Article
Identifier: vital:7321 , http://hdl.handle.net/10962/d1020566
Description: This work reports on the photophysical parameters of the conjugate between zinc octacarboxy phthalocyanine (ZnOCPc) and bovine serum albumin (BSA) represented as ZnOCPc–BSA (1) which was further adsorbed onto single walled carbon nanotubes (SWCNT) represented as (ZnOCPc–BSA–SWCNT 2). ZnOCPc (without BSA) was also adsorbed on SWCNT represented as ZnOCPc–SWCNT (3). The presence of BSA resulted in the increase in singlet oxygen quantum yield (ΦΔ) for 1 (at ΦΔ = 0.44) and 2 (at ΦΔ = 0.41) compared to ΦΔ = 0.21 for ZnOCPc alone. For complex 3 which did not contain BSA singlet oxygen quantum yield decreased. , Original publication is available at http://dx.doi.org/10.1016/j.saa.2013.10.064
Full Text: false

Quick View

Effects of differently shaped silver nanoparticles on the photophysics of pyridylsulfanyl-substituted phthalocyanines

- D’Souza, Sarah, Mashazi, Philani N, Britton, Jonathan, Nyokong, Tebello

Authors: D’Souza, Sarah , Mashazi, Philani N , Britton, Jonathan , Nyokong, Tebello
Language: English
Type: Article
Identifier: vital:7290 , http://hdl.handle.net/10962/d1020353
Description: This paper reports on the photophysical behavior of (2-pyridylsulfanyl)phthalocyaninato zinc(II) and 2,9(10),16(17),23(24)-tetra-(2-pyridylsulfanyl)phthalocyaninato zinc(II) in the presence of differently shaped silver nanoparticles (nanospheres, nanotriangles and nanoflowers). The presence of shaped nanoparticles increased both triplet quantum yields and lifetimes of the tetra-substituted mercaptopyridine zinc phthalocyanine in DMSO. It is apparent from this work that the shape of the silver nanoparticle used is of little consequence in influencing photophysical behavior of the phthalocyanines. , Original publication is available at http://dx.doi.org/10.1016/j.poly.2015.06.038
Full Text: false

Quick View

Effects of number of ring substituents on the physicochemical properties of zinc aminophenoxy phthalocyanine-single walled carbon nanotube conjugate

- Ogbodu, Racheal O, Nyokong, Tebello

Authors: Ogbodu, Racheal O , Nyokong, Tebello
Language: English
Type: Article
Identifier: vital:7319 , http://hdl.handle.net/10962/d1020564
Description: This work reports on the linking of zinc monoaminophenoxy (ZnMAPPc) or zinc tetraaminophenoxy phthalocyanine (ZnTAPPc) complexes to single walled carbon nanotubes (SWCNTs) through either covalent or non-covalent (adsorption) bonding. The functionalized complexes showed better thermal stability when compared to the SWCNT-COOH, ZnMAPPc and ZnTAPPc alone as confirmed by thermogravimetric analyses. The covalently linked ZnMAPc-SWCNT showed higher electron transfer rate constant and photoinduced electron efficiency when compared to adsorbed complexes. ZnMAPPc-SWCNT complexes (linked and adsorbed) showed better photophysical and photochemical properties when compared to ZnTAPPc-SWCNT complexes. The triplet, singlet oxygen and florescence quantum yields of ZnMAPPc (or ZnTAPPc) decrease upon linking or adsorption onto SWCNTs. , Original publication is available at http://dx.doi.org/10.1016/j.jphotochem.2013.09.015
Full Text: false

Quick View

Effects of Redox Mediators on the Catalytic Activity of Iron Porphyrins towards Oxygen Reduction in Acidic Media

- He, Qinggang, Wu, Gang, Liu, Ke, Khene, M Samson, Li, Qing, Mugadza, Tawanda, Deunf, Elise, Nyokong, Tebello, Chen, Shaowei W

Authors: He, Qinggang , Wu, Gang , Liu, Ke , Khene, M Samson , Li, Qing , Mugadza, Tawanda , Deunf, Elise , Nyokong, Tebello , Chen, Shaowei W
Language: English
Type: Article
Identifier: vital:7291 , http://hdl.handle.net/10962/d1020354
Description: The effects of different redox mediators on the oxygen reduction reaction (ORR) catalyzed by an iron porphyrin complex, iron(III) meso-tetra(N-methyl-4-pyridyl)porphine chloride [FeIIITMPyP], in 0.1 M triflic acid were investigated by cyclic voltammetry (CV) and spectroelectrochemistry in conjunction with density functional theory (DFT) calculations. The formal potentials of the FeIIITMPyP catalyst and the redox mediators, as well as the half-wave potentials for the ORR, were determined by CV in the absence and presence of oxygen in acidic solutions. UV/Vis spectroscopic and spectroelectrochemical studies confirmed that only the 2,2′-azino-bis(3-ethylbenzothiazioline-6-sulfonic acid)diammonium salt (C18H24N6O6S4) showed effective interactions with FeIIITMPyP during the ORR. DFT calculations suggested strong interaction between FeIIITMPyP and the C18H24N6O6S4 redox mediator. The redox mediator caused lengthening of the dioxygen iron bond, which thus suggested easier dioxygen reduction. Consistent results were observed in electrochemical impedance spectroscopic measurements for which the electron-transfer kinetics were also evaluated. , Original publication is available at http://dx.doi.org/10.1002/celc.201402054
Full Text: false

Quick View

Effects of ZnO nanohexagons and nanorods on the fluorescence behavior of metallophthalocyanines

- D’Souza, Sarah, Moeno, Sharon, Nyokong, Tebello

Authors: D’Souza, Sarah , Moeno, Sharon , Nyokong, Tebello
Language: English
Type: Article
Identifier: vital:7263 , http://hdl.handle.net/10962/d1020272
Description: This paper looks at the fluorescence behavior of zinc phthalocyanines: 2,(3),9(10),16(17),23(24)-tetrakis-(mercaptoacetic acid phthalocyaninato) zinc(II) (ZnTMAAPc), 2,(3),9(10),16(17),23(24)-tetrakis-(mercaptopropanoic acid phthalocyaninato) zinc(II) (ZnTMPAPc) and (OH)AlPcSmix (the latter contains a mixture of the di-, tri- and tetra-sulfonated derivatives with an average of three sulfonated groups per molecule) in the presence of ZnO nanoparticles. Fluorescence lifetimes of Pc complexes generally decreased in the presence of ZnO nanoparticles, with generally longer lifetimes for ZnO nanohexagons compared to ZnO nanorods. , Original publication is available at http://dx.doi.org/10.1016/j.poly.2014.09.012
Full Text: false

Quick View

Electrocatalytic activity of bimetallic Au–Pd nanoparticles in the presence of cobalt tetraaminophthalocyanine

- Maringa, Audacity, Mashazi, Philani N, Nyokong, Tebello

Authors: Maringa, Audacity , Mashazi, Philani N , Nyokong, Tebello
Language: English
Type: Article
Identifier: vital:7245 , http://hdl.handle.net/10962/d1020250
Description: Au and Pd nanoparticles were individually or together electrodeposited on top of polymerized cobalt tetraaminophthalocyanine (poly-CoTAPc). When Pd and Au nanoparticles are co-deposited together, the electrode is denoted as Au–Pd (co-deposited)/poly-CoTAPc-GCE. X-ray photoelectron spectroscopy (XPS) was used to show the successful deposition of AuNPs, PdNPs and Au–Pd (co-deposited). The scanning electrochemical microscopy showed that Au–Pd (co-deposited)/poly-CoTAPc-GCE (with current range of 9.5–13.5 μA) was more conducting than Au–Pd (co-deposited)-GCE (with current range of 8–12 μA). Electrochemical impedance spectroscopy (EIS) showed that there was less resistance to charge transfer for Au–Pd (co-deposited)/poly-CoTAPc-GCE compared to the rest of the electrodes. Au–Pd (co-deposited)/poly-CoTAPc-GCE showed the best activity for the electrooxidation of hydrazine in terms of limit of detection (0.5 μM), hence shows promise as an electrocatalyst for electrooxidation of hydrazine. , Original publication is available at http://dx.doi.org/10.1016/j.jcis.2014.10.056
Full Text: false

Quick View

Electrocatalytic behahiour of cobalt tetraamino-phthalocyanine in the presence of a composite of reduced graphene nanosheets and of multi-walled carbon nanotubes

- Nyoni, Stephen, Nyokong, Tebello

Authors: Nyoni, Stephen , Nyokong, Tebello
Language: English
Type: Article
Identifier: vital:7309 , http://hdl.handle.net/10962/d1020386
Description: A composite of multi-walled carbon nanotubes (MWCNT) with reduced graphene nanosheets (rGNS-2) was developed in order to minimize the restacking of the latter. The composite was used to modify a glassy carbon electrode (GCE). GCE was further modified with cobalt tetraamino phthalocyanine (CoTAPc). The modified electrode is represented as rGNS-2-MWCNT-CoTAPc-GCE. X-ray photoelectron spectroscopy, transmission electron microscopy, scanning electrochemical microscopy and Raman spectroscopy were used to explore into surface functionalities, morphology and topography of the nanocomposite. The rGNS-2-MWCNT-CoTAPc-GCE had a low limit of detection of 3.32 × 10−8 M towards the detection of paraguat as a test analyte. A mechanism for paraquat detection using an rGNS-2-MWCNT-CoTAPc-GCE is also proposed in this work. , Original publication is available at http://dx.doi.org/10.1016/j.electacta.2014.05.093
Full Text: false

Showing items 28681 - 28700 of 29175