Showing items 37061 - 37080 of 63263

Morena re go lebogela letsatsi je

A new species of the fish genus Pontinus (Scorpaeniformes: Scorpaenidae) from off Natal, South Africa

  • Authors: Eschmeyer, William N , J.L.B. Smith Institute of Ichthyology
  • Date: 1983-05
  • Subjects: Fishes -- South Africa , Scorpionfishes -- South Africa
  • Language: English
  • Type: text , book
  • Identifier: http://hdl.handle.net/10962/69991 , vital:29605 , Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB)) Periodicals Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB))
  • Description: Online version of original print edition of the Special Publication of the J.L.B. Smith Institute of Ichthyology; No. 28 , Pontinus nigerimum is described as a new species, the first of this genus from the Indian Ocean. This species is known only from one specimen collected off Natal in 146 m . It is characterized by having a black band encircling the base of the long supraocular tentacles.
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  • Date Issued: 1983-05

Bold man saves tree

Elizabeth Lydia Pocock with Elizabeth (Bessie)

  • Subjects: Pocock family -- Photographs Pocock, Elizabeth (Bessie) -- Photographs Pocock, Elizabeth Lydia -- Photographs
  • Type: Image
  • Identifier: http://hdl.handle.net/10962/33095 , vital:24112 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017. , PIC/M 6485
  • Description: Elizabeth Lydia Pocock with Elizabeth (Bessie). , Probably donated by the Pocock Family
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Urban-rural contrasts in Arbor Week in South Africa

  • Authors: Guthrie, G , Shackleton, Charlie M
  • Date: 2006
  • Language: English
  • Type: Article
  • Identifier: vital:6631 , http://hdl.handle.net/10962/d1006823
  • Description: Trees provide people with environmental benefits. Greening projects have been implemented worldwide, but many of them have frustratingly low participation levels. In South Africa, tree-planting campaigns such as the national Arbor Week are generally aimed at schools. Because of the remoteness of rural schools, there are urban / rural disparities in standards of education, infrastructure and support provided at schools, and hence we hypothesized that these disparities would be mirrored in tree-planting activities associated with national Arbor Week. In the study reported here, 236 urban and rural schools were assessed by means of postal surveys and subsampled via direct interviews, as to their participation in Arbor Week activities, the provision of trees, constraints to participation, and the perceived benefits of planting trees. Very few urban schools had never participated in any Arbor Week activities, whereas one-fifth of rural ones had never participated in any way. Urban schools participated in a greater number of Arbor Week activities than rural schools, including tree-planting, displaying posters and having speeches. Thus, overall information about Arbor Week is lacking in rural areas compared to urban ones. Rural schools derived more benefits from planting trees, with shade and education being the primary benefits overall. Rural schools were supplied with trees by NGOs, whereas urban schools received trees from individual or company donations. The major constraints to tree-planting are livestock damage, water shortages, vandalism and theft. These obstacles need to be addressed in a holistic fashion in order to improve the participation and success of National Arbor Week as a vehicle for tree-planting and environmental awareness.
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  • Date Issued: 2006

Katisha

Facilities management competencies and performance : A case of a property company in the city of Johannesburg

  • Authors: Matheba, Neo Elias
  • Date: 2022-04
  • Subjects: Property -- South Africa , Real estate management
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/58555 , vital:59812
  • Description: Facilities management (FM) as a profession continues to evolve in the same manner and pace as the rest of the world. from being a profession hidden in the janitor rooms to being elevated to the senior executive position where influence on strategic organisational decisions is possible, FM professionals are required to possess virious skills, knowledge and qualifications to be considered competent and effective. the reserch seekd to establish the current qualifications and skills of the FM professionals in the Joburg property Company (JPC), thier attitudes and perceptions regarding FM qualification and training, the important competency requirements and practising levels, as well as the knowledge and application of strategic performance measures within the JPC to achieve its business objectives. , Thesis (MA) -- Faculty of Engineering, the Built Environment, and Technology, 2022
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  • Date Issued: 2022-04

Ntendene

Die musikale potensiaal van die kleuter en die ontwikkeling van 'n sillabus vir pre-primêre musiekopvoeding met besondere verwysing na die Dalcroze-, Kodaly-, en Orff-metodes

  • Authors: Hendrikse, Salomé
  • Date: 1982
  • Language: Afrikaans
  • Type: Thesis , Masters , MMus
  • Identifier: vital:2667 , http://hdl.handle.net/10962/d1006147
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  • Date Issued: 1982

Rhodeo, Vol. 27, No. 1

  • Date: 1973-02-22
  • Subjects: Grahamstown -- Newspapers , Journalism, Students -- South Africa , Rhodes University -- Activate , Rhodes University -- Students , Student newspapers and periodicals -- South Africa
  • Language: English
  • Type: Text
  • Identifier: vital:14643 , http://hdl.handle.net/10962/d1019515
  • Description: Rhodeo is the Independent Student Newspaper of Rhodes University. Located in Grahamstown, Rhodeo was established in 1947, and renamed in 1994 as Activate. During apartheid Rhodeo became an active part of the struggle for freedom of expression as part of the now defunct South African Student Press Union. Currently Activate is committed to informing Rhodes University students, staff and community members about relevant issues, mainly on campus. These issues range from hard news to more creative journalism. While Activate acts as a news source, one of its main objectives it to be accessible as a training ground for student journalists. The newspaper is run entirely by the students and is published twice a term. Activate is a free newspaper which receives an annual grant from the Rhodes University Student Representative Council, however, majority of its revenue is generated through advertising.
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  • Date Issued: 1973-02-22

Chelsea Point, Marine Drive, Port Elizabeth

Angowele mtapasia

The development of a set of guidelines for the revision of psychological tests and the use of revised psychological tests

  • Authors: Cronje, Johan Herman
  • Date: 2020
  • Subjects: Psychological tests
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: http://hdl.handle.net/10948/46350 , vital:39567
  • Description: The psychological testindustry has produced a wide variety of psychological tests that are used by professionals to facilitate measurement and decision-making. Tests are updated and revised periodically in order to remain current, valid and reliable in what is a competitive psychometric industry. Despite the prevalence of test revisions, especially in recent years, a number of authors have commented on the lack of comprehensive guidelines for test revision. Guidelines shouldcover aspects such as what the different types of revision are, when to embark on a revision, whatprocessto followand how test users should use revised tests. Test revision differs from test construction in a number of ways. There are external factors that affect the regularity with which a test should be revised. Test revision also involves more role players than test construction, including the opinions of those test users who may be resistant to any change in the previous test edition. Finally, revised tests sometimes have to contend with requirements from the test publisher who purchased the test or distribution rights from the developer. Test revision is expensive and time consuming, which leaves little scope for experimentation or trial-and-error. The availability of expertise, as well as the human and financial resources required to complete test revisionscan make such projects unaffordable, especiallyforprofessionals indeveloping countries, such as South Africa.It may be more feasible for such professionalsto collaborate with international revision projects. By doing so they cangain experience in test revision, contribute indigenous information that could shapethe revision ofan international test, increase opportunities to engage with international users, and potentially source international funding for research in their own country. The current studydevelopeda comprehensive and practical set of 30 guidelines to assist those involved in test revision. These guidelines were peer-reviewed and refined. Finally, the guidelines were field-tested using a case study of a recently revised ivdevelopmentaltest, the Griffiths III. Professionals from South Africa, including the present researcher,formed part of the international team for the extensive revision of the Griffiths III, which makes this test an ideal case study from both the perspectives of the developed test revision guidelines as well as collaboration of professionals from a developing country in an international test revision. The knowledge gainedfrom the development of guidelines and international collaboration in test revision is reflected on.
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  • Date Issued: 2020

A structural investigation of the short stories of Katherine Mansfield with special reference to the idea of the true and false self

  • Authors: Geldenhuys, M F
  • Date: 1974
  • Subjects: Mansfield, Katherine, 1888-1923 -- Criticism and interpretation , Short stories , Self in literatur
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: vital:2296 , http://hdl.handle.net/10962/d1011969
  • Description: A survey of the available literature on Katherine Mansfield has shown that, in the five decades which have elapsed since the author's death, critical interest has gradually, but significantly, altered its direction. Despite the workmanlike assessments of such critics as David Daiches in Britain and Andre Maurois in France, and the recognition of her mastery of the short story form by such fellow practitioners of the art as H.E. Bates and Elizabeth Bowen, the mainstream of criticism tended, in the first decades after the author's death, to centre less upon the characteristics of the work itself than upon a cult- like fascination, initiated, perhaps, by the perceptive but over-interested pen of Middleton Murry. Only more recently has this tendency been superseded by a more rigorous scrutiny of the stories themselves; thus the excellence of the author 's technique has now become a major concern. Recent recognition has been accorded, too, to the fact that the stories were in the vanguard of their time with regard to the choice of, as well as the treatment of, theme. Intro. p. 1-2.
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  • Date Issued: 1974

Surface modifications of InAs: effect of chemical processing on electronic structure and photoluminescent properties

  • Authors: Eassa, Nahswa Abo Alhassan Eassa
  • Date: 2012
  • Subjects: Indium arsenide , Chemical processes , Photoluminescence
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: http://hdl.handle.net/10948/8714 , vital:26423
  • Description: In this thesis, the effects of various chemical treatments on the surface modification of bulk InAs are investigated. The study focuses on the chemical processes that occur upon the exposure of the surface to sulphur-, chlorine- and bromine-containing solutions and oxygen, and the resulting changes to the electronic structure of the surface, as deduced from photoluminescence (PL) measurements, X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), Raman scattering and scanning electron microscopy (SEM). Three processing treatments were evaluated: i) treatment with sulphur-based solutions (Na2S:9H2O, (NH4)2S + S, [(NH4)2S / (NH4)2SO4] + S); ii) etching in halogen-based solutions (bromine-methanol and HCl: H2O); and iii) thermal oxidation. A significant overall enhancement in PL response was observed after chemical treatment or thermal oxidation, which is associated with a reduction in surface band bending. These changes correlate with the removal of the native oxide, in addition to the formation of well-ordered layers of In-S (or In-As)O as a passivating layer, indicating that electronic passivation occurs at the surface. The passivating effect on sulphide treated surfaces is unstable, however, with an increase in band bending, due to reoxidation, observed over periods of a few days. The lowest re-oxidation rate was observed for ([(NH4)2S / (NH4)2SO4] + S). Etching in HCl:H2O and Br-methanol solutions of appropriate concentrations and for moderate times (1 min) resulted in smooth and defect-free InAs surfaces. Etching completely removed the native oxides from the surface and enhanced the PL response. The adsorption of bromine and chlorine onto the InAs surface led to the formation of As-Brx , In-Brx, As-Clx and In-Clxcompounds (x = 1, 2, 3), as inferred from changes in the In 3d3/2; 5/2 and As 3d core level binding energies. The etch rate was found to decrease because of strong anisotropic effects. The improvements in surface properties were reversed, however, if the concentrations of the etchants increased or the etch time was too long. In the worst cases, pit formation and inverted pyramids with {111} side facets were observed. Surface treatments or thermal oxidisation significantly enhanced the PL intensity relative to that of the as-received samples. This was due to a reduction in the surface state density upon de-oxidation, or in some cases, to the formation of a well ordered oxide layer on the surface. The overall increase in PL intensity after treatment is ascribed to a reduction in band bending near the surface. This allows several welldefined peaks not observed or reported previously for bulk InAs (with a carrier concentration n~2x1016 cm-3), to be studied. A combination of PL and XPS measurements before and after the various treatments was used to identify the chemical nature of the impurities giving rise to bound exciton recombination in InAs (111).
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  • Date Issued: 2012

Rhodes University College - Administrative buildings and Clock Tower

  • Subjects: Rhodes University -- Buildings -- Photographs Rhodes University -- History -- Photographs
  • Type: Image
  • Identifier: http://hdl.handle.net/10962/40912 , vital:25038 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017. , PIC/M 6580on
  • Full Text: false

Can perceptions of environmental and climate change in island communities assist in adaptation planning locally?

  • Authors: Aswani, Shankar , Vaccaro, Ismael , Abernethy, Kirsten Elizabeth , Albert, Simon , de Pablo, Javier Fernández-López
  • Date: 2015
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/123310 , vital:35426 , https://doi.10.1007/s00267-015-0572-3
  • Description: Local perceptions of environmental and climate change, as well as associated adaptations made by local populations, are fundamental for designing comprehensive and inclusive mitigation and adaptation plans both locally and nationally. In this paper, we analyze people’s perceptions of environmental and climate-related transformations in communities across the Western Solomon Islands through ethnographic and geospatial methods. Specifically, we documented people’s observed changes over the past decades across various environmental domains, and for each change, we asked respondents to identify the causes, timing, and people’s adaptive responses. We also incorporated this information into a geographical information system database to produce broad-scale base maps of local perceptions of environmental change. Results suggest that people detected changes that tended to be acute (e.g., water clarity, logging intensity, and agricultural diseases). We inferred from these results that most local observations of and adaptations to change were related to parts of environment/ecosystem that are most directly or indirectly related to harvesting strategies. On the other hand, people were less aware of slower insidious/chronic changes identified by scientific studies. For the Solomon Islands and similar contexts in the insular tropics, a broader anticipatory adaptation planning strategy to climate change should include a mix of local scientific studies and local observations of ongoing ecological changes.
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  • Date Issued: 2015

CHIP: a co-chaperone for degradation by the proteasome

  • Authors: Edkins, Adrienne L
  • Date: 2015
  • Language: English
  • Type: text , book
  • Identifier: http://hdl.handle.net/10962/164863 , vital:41179 , ISBN 978-3-319-11730-0 , DOI: 10.1007/978-3-319-11731-7_11
  • Description: Protein homeostasis relies on a balance between protein folding and protein degradation. Molecular chaperones like Hsp70 and Hsp90 fulfil well-defined roles in protein folding and conformational stability via ATP dependent reaction cycles. These folding cycles are controlled by associations with a cohort of non-client protein co-chaperones, such as Hop, p23 and Aha1. Pro-folding co-chaperones facilitate the transit of the client protein through the chaperone mediated folding process. However, chaperones are also involved in ubiquitin-mediated proteasomal degradation of client proteins. Similar to folding complexes, the ability of chaperones to mediate protein degradation is regulated by co-chaperones, such as the C terminal Hsp70 binding protein (CHIP).
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  • Date Issued: 2015

Assessing penetration enhances for topical corticosteroids

  • Authors: Smith, Eric W , Haigh, John M
  • Date: 1995
  • Language: English
  • Type: Book chapter
  • Identifier: vital:6442 , http://hdl.handle.net/10962/d1006629
  • Description: From introduction: Topical corticosteroids have been used for a wide range of dermatological conditions for the last 4 decades. For many years the topical delivery system was a relatively simple cream or ointment base, with little thought given to improving the formulation as far as drug delivery was concerned. The main emphasis in the initial stages of development was on the alteration of the corticosteroid molecule, in an attempt to produce moieties with a higher intrinsic topical effect with lower mineralocorticoid side effects. Once this avenue of research was exhausted, attention was placed on the lipophilicity of the molecule with the production of various types of esters in an attempt to produce molecules which would pass through the stratum corneum (SC) with reasonable ease. In recent years the nature of the semisolid drug delivery base has received considerable attention.2-5The nature of the vehicle has a profound effect on the rate of release of the topical corticosteroid from the formulation and its passage through the SC. One of the most important aspects of the formulation of the base is the inclusion of substances which aid this trads-SC diffusion, the so-called penetration enhancers.6The modes of action of the various different types of penetration enhancers are reviewed elsewhere in this book. The best method for the assessment of the release of corticosteroids from topical formulations is obviously the clinical tri~. Clinical trials, however, are laborious, costly, and difficult to mount. Patients suffering from dermatological complaints are not ideal subjects for the testing of topical corticosteroid formulations as it is difficult to obtain standardized lesions which are necessary for the comparison of results between formulations. Alternatively, a number of in vitro models exist for this type of assessment, but it is often problematic to obtain correlation with the in vivo situation.
  • Full Text:
  • Date Issued: 1995

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