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Towards a standard model for networked audio devices

  • Authors: Eales, Andrew , Foss, Richard
  • Date: 2011
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/427151 , vital:72418 , https://www.aes.org/e-lib/online/browse.cfm?elib=16144
  • Description: Different control protocols for networked audio devices typically emphasize particular aspects of a device, such as the representation of parameter data, or a representation of the functional structure of a device. A sophisticated device model must represent parameter data, device structure and the visual presentation of controls. Parameter data should be related to the device structure, while also being represented within a flexible, logical hierarchy. The development of a standard device model is proposed and discussed with reference to the OSC, IEC62379, ACN and X170 control protocols. This abstract model is independent of any specific control protocol, and provides support for interoperability between control protocols. The proposed model is also discussed within the context of an object-based approach to service enumeration and control using an associative, shared memory model.
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  • Date Issued: 2011

Towards a framework for assessing the sustainability of local economic development based on natural resources: honeybush tea in the Eastern Cape Province of South Africa

  • Authors: Polak, James , Snowball, Jeanette D
  • Date: 2017
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/69201 , vital:29445 , https://doi.org/10.1080/13549839.2016.1196348
  • Description: Despite the popularity of local economic development (LED) as a job creation and economic growth strategy in South Africa, many LED projects have not proved to be sustainable in the long-run, especially where human systems interact with biological ones. This article examines the relationship between sustainability and LED within the context of the emerging honeybush tea industry in the Eastern Cape. Data were gathered from provincial as well as local government policy documents and reports, and via key informant interviews. The data were analysed using Connelly’s [(2007). Mapping sustainable development as a contested concept. Local Environment, 12 (3), 259–278] three pronged approach to sustainable development as a lens through which to view the local industry. Findings showed that the industry offers many opportunities for development, including job creation in poorer, rural households; sustainable wild harvesting using a permit system; commercial cultivation; potential to develop social capital; potential for community-based LED; and product diversification. However, there are also corresponding challenges: There is currently no reliable data on the maximum sustainable yield, which is needed to guide quota allocations for entrepreneurial harvesters harvesting from wild stocks; possible biodiversity loss; and enforcing the permit scheme is proving difficult in remote rural areas.
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  • Date Issued: 2017

Towards a Classification of Intrusion Strength

  • Authors: Motara, Yusuf M , Irwin, Barry V W
  • Date: 2005
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/428261 , vital:72498 , https://www.researchgate.net/profile/Yusuf-Mota-ra/publication/267206150_Towards_a_Classification_of_Intru-sion_Strength/links/547485820cf245eb436de34e/Towards-a-Classification-of-Intrusion-Strength.pdf
  • Description: This paper proposes a new term, “intrusion strength”, for use by the se-curity community and those affected by compromised systems. It justi-fies the usefulness of such a term, proposes a preliminary ranking of intrusion strength factors, and concludes by mentioning the work nec-essary to create a full taxonomy of intrusion strength.
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  • Date Issued: 2005

Towards a better grasp of what matters in view of ‘the posts’

  • Authors: O'Donoghue, Rob , Lotz-Sisitka, Heila
  • Date: 2005
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/182693 , vital:43854 , xlink:href="https://doi.org/10.1080/13504620500169593"
  • Description: This response to McKenzie suggests that the issues of representivity, legitimacy and politics, inscribed within an institutional continuism characteristic of modernity within the McKenzie discourse, could well be recast within a reflexive view informed by insights derived with developing social theory. It briefly overviews the struggle for human agency that played out within the deconstructive engagements of the posts and probes how perspectives in social theory are opening the way for a break with features of environmental education as an institutional field. The review points to a reconstituting of the idea of environmental education research from scholastic field of/for environmental awareness and sustainable development, to a reflexive engagement within processes of social reproduction and reorientation in a changing world. A shift such as this would constitute a subtle change in a developing field of research, to situated design decisions of reflexive engagement (research) in social fields constituted within developing cultural contexts of risk.
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  • Date Issued: 2005

Toward visualised network intrusion detection

  • Authors: van Riel, J.P , Irwin, Barry V W
  • Date: 2006
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/428238 , vital:72496 , https://www.cs.ru.ac.za/research/g02v2468/publications/vanRiel-SATNAC2006.pdf
  • Description: To deal with the large volume of network data, contemporary solutions seek to automate the process of detecting intrusive activity. However, intrusion detection systems can produce an overwhelming number of alerts, and many false alarms can obscure serious intrusion attempts. To overcome these difficulties, this paper suggests combining dedicat-ed sensor network monitoring with visualisation. With the aim of evaluat-ing intrusion detection systems, we introduce the idea of using graph-ical representations to superimpose alert information over raw network traffic.
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  • Date Issued: 2006

Tourism entrepreneurship: the contours of challenges faced by female-owned BnBs and Guesthouses in Mthatha, South Africa

  • Authors: Hlanyane, Tabisa Monalisa , Acheampong, Kofi Owusu
  • Date: 2017
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/11260/6563 , vital:46659 , https://www.ajhtl.com/uploads/7/1/6/3/7163688/article_50_vol_6__4__2017.pdf
  • Description: The purpose of the study was to investigate and discover the facts about the challenges of female entrepreneurs who are the owners of bed and breakfasts and guesthouses in Mthatha, and to find out whether these challenges have an impact in their business performance. By way of using a semi-structured survey, women who own guesthouses and bed and breakfast establishments were targeted by way of a purposive snowball sampling technique. The primary data collected indicated that female-entrepreneurs in Mthatha face a number of challenges including limited access to finance, seasonality, balancing work and family life, corruption/bribery, poor infrastructure, inability to attend seminars and workshops to network, poor customer service and lack of awareness to the required training/skills to function effectively. However, such women remain resilient to the aforementioned challenges, largely motivated by such factors linked to flexibility, the quest to remain independent and the belief in the opportunity and financial incentives that their operation represents. This study has implications for entrepreneurship and economic growth in South Africa and how vulnerable businesses including women’s require continuous support from government and private sector to remain competitive and economically sustainable.ackground:Context-specific factors influence adherence to antiretroviral therapy (ART) among pregnant womenliving with HIV. Gaps exist in the understanding of the reasons for the variable outcomes of the prevention ofmother-to-child transmission (PMTCT) programme at the health facility level in South Africa. This study examinedadherence levels and reasons for non-adherence during pregnancy in a cohort of parturient women enrolled in thePMTCT programme in the Eastern Cape, South Africa.Methods:This was a mixed-methods study involving 1709 parturient women in the Eastern Cape, South Africa. Weconducted a multi-centre retrospective analysis of the mother-infant pair in the PMTCT electronic database in 2016.Semi-structured interviews of purposively selected parturient women with self-reported poor adherence (n= 177)were conducted to gain understanding of the main barriers to adherence. Binary logistic regression was used todetermine the independent predictors of ART non-adherence.Results:A high proportion (69.0%) of women reported perfect adherence. In the logistic regression analysis, afteradjusting for confounding factors, marital status, cigarette smoking, alcohol use and non-disclosure to a family memberwere the independent predictors of non-adherence. Analysis of the qualitative data revealed that drug-related side-effects, being away from home, forgetfulness, non-disclosure, stigma and work-related demand were among the mainreasons for non-adherence to ART.Conclusions:Non-adherence to the antiretroviral therapy among pregnant women in this setting is associated withlifestyle behaviours, HIV-related stigma and ART side-effects. In order to eliminate mother-to-child transmission of HIV,clinicians need to screen for these factors at every antenatal clinic visit.Keywords:Adherence, Non-adherence, HIV, Antiretroviral therapy, Elimination of mother-to-child transmission,Prevention of mother-to-child transmission, Stigma, South Africa
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  • Date Issued: 2017

Touching matters: affective entanglements in Coronatime

  • Authors: Bozalek, Vivienne , Newfield, Denise , Romano, Nike , Carette, Lieve , Naidu, Katharine , Mitchell, Veronica , Noble, Alex
  • Date: 2020
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/160357 , vital:40438 , https://0-doi.org.wam.seals.ac.za/10.1177/1077800420960167
  • Description: This article troubles touch as requiring embodied proximity, through an affective account of virtual touch during coronatime. Interested in doing academia differently, we started an online Barad readingwriting group from different locations. The coronatime void was not a vacuum, but a plenitude of possibilities for intimacy, pedagogy, learning, creativity, and adventure. Although physically apart, we met daily through Zoom, and we touched and were touched by each other and the texts we read. A montage of writing fragments and a collective artwork, based on the Massive_Micro project, highlight virtual touching. Undone, redone, and reconfigured, we became a diffractive human/nonhuman multiplicity.
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  • Date Issued: 2020

Topsoil transfer from natural renosterveld to degraded old fields facilitates native vegetation recovery:

  • Authors: Ruwanza, Sheunesu
  • Date: 2020
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/148639 , vital:38758 , https://doi.org/10.3390/su12093833
  • Description: The transfer of soils from intact vegetation communities to degraded ecosystems is seen as a promising restoration tool aimed at facilitating vegetation recovery. This study examined how topsoil transfer from intact renosterveld to degraded old fields improves vegetation diversity, cover, and composition. Transferred topsoil were overlaid on 30 quadrats, each measuring 1 m2, in May 2009. Eight years following the initial soil transfer, vegetation diversity in the soil transfer site showed an increase towards the natural site compared to the old field site where no soil transfer was administered. Both species richness and cover for trees and shrubs in the soil transfer site increased towards the natural site, though this was not the case for herbs and grasses. One-way analysis of similarity (ANOSIM) showed significant (R = 0.55) separation in community composition between sites. The study concludes that soil transfer from intact renosterveld to degraded old fields is a promising restoration technique because it increases species diversity and cover and facilitates vegetation recovery. A significant restoration implication of this study is that soil transfer introduces key renosterveld native tree and shrub species that can facilitate successful restoration and act as restoration foci or nurse plants.
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  • Date Issued: 2020

Top-Down Synthesis of a Lamivudine-Zidovudine Nano Co-Crystal

  • Authors: Witika, Bwalya A , Smith, Vincent J , Walker, Roderick B
  • Date: 2021
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/183172 , vital:43918 , xlink:href="https://doi.org/10.3390/cryst11010033"
  • Description: Lamivudine (3TC) and zidovudine (AZT) are antiretroviral agents used to manage HIV/AIDS infection. A wet media milling top-down approach was used to develop and produce nano co-crystals of 3TC and AZT. Micro co-crystals were prepared by solvent evaporation and subsequently milled in the presence of two surfactants, viz., sodium lauryl sulfate (SLS) and α-tocopheryl polyethylene glycol succinate 1000 (TPGS 1000). Optimisation was undertaken using design of experiments (DoE) and response surface methodology (RSM) to establish and identify parameters that may affect the manufacturing of nano co-crystals. The impact of SLS and TPGS 1000 concentration, milling time, and number of units of milling medium on the manufacturing of nano co-crystals, was investigated. The critical quality attributes (CQA) monitored were particle size (PS), Zeta potential (ZP), and polydispersity index (PDI). Powder X-ray diffraction, Fourier transform infrared spectroscopy, differential scanning calorimetry, transmission electron microscopy, energy dispersive X-ray spectroscopy scanning electron microscopy, and cytotoxicity assays were used for additional characterization of the optimised nano co-crystal. The mean PS, PDI, and ZP of the optimised top-down nanocrystal were 271.0 ± 92.0 nm, 0.467 ± 0.073, and −41.9 ± 3.94 mV, respectively. In conclusion, a simple, inexpensive, rapid, and precise method of nano co-crystal manufacturing was developed, validated, and optimised using DoE and RSM, and the final product exhibited the target CQA.
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  • Date Issued: 2021

Tools to enrich vulnerability assessment and adaptation planning for coastal communities in data-poor regions: application to a case study in Madagascar

Too big to fail?: the case of the New York Times: journalism next

  • Authors: Garman, Anthea
  • Date: 2015
  • Language: English
  • Type: text , article
  • Identifier: vital:38353 , http://hdl.handle.net/10520/EJC175792
  • Description: Andrew Phelps, the Senior Product Manager for The New York Times and one of the investigators involved in the leaked Innovation Report, (the paper's investigation on changes needed to cope with the digital world) was the keynote speaker at the Menell Media Exchange (MMX15) in South Africa this year. Here are some highlights from his talk to a crowded room of journalists from across the country and journalism spectrum.
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  • Date Issued: 2015

Toasting women of the 50s

  • Authors: Thomas, Cornelius
  • Date: 2001-06-01
  • Subjects: Rathebe, Dolly Jazz musicians -- South Africa Jazz -- South Africa --20th century
  • Type: article
  • Identifier: http://hdl.handle.net/10962/41080 , vital:25052 , 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. , MS 20 037
  • Description: Photocopied article from the newspaper The Daily Dispatch about Dolly Rathebe, a jazz musician.
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  • Date Issued: 2001-06-01

To be Xhosa or not to be Xhosa… that is the question:

  • Authors: De Klerk, Vivian A
  • Date: 2010
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/158096 , vital:40148 , https://doi.org/10.1080/01434630008666401
  • Description: It has long been recognised that indigenous languages are endangered because of powerful social, political and economic pressures. In South Africa, the legacy of apartheid has left its indigenous languages particularly vulnerable, and since 1994 huge efforts have been made to reverse the situation. Despite the new language policy and accompanying legislation, it would seem that many Xhosa speakers themselves want English, and not Xhosa,for their children. This paper reports on a multi-faceted quantitative and qualitative survey in and around Grahamstown in the Eastern Cape Province, which focused on the steady trickle of speakers of Xhosa into English-medium schools in thearea, and examined the reasons underlying decisions to send Xhosa children to these schools and the subsequent linguistic and psycho-social effects of the move on the children.
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  • Date Issued: 2010

Time-resolved luminescence of low sensitivity quartz from crystalline rocks

  • Authors: Chithambo, Makaiko L , Preusser, F , Ramseyer, K , Ogundare, F O
  • Date: 2007
  • Language: English
  • Type: text , article
  • Identifier: vital:6801 , http://hdl.handle.net/10962/d1004164 , https://doi.org/10.1016/j.radmeas.2006.07.005
  • Description: preprint , Time-resolved luminescence spectra of low sensitivity natural quartz from crystalline rocks are presented. The luminescence was pulse-stimulated at width using 470 nm blue light from quartz separated from plutonic, metamorphic, volcanic and hydrothermal samples. Measurements were made at 20 °C. All samples show evidence of a short lifetime component less than long although in several cases too weak in intensity to be evaluated accurately. On the other hand, the value of the principal lifetime component varies considerably being about in metamorphic quartz, in plutonic quartz, and in one example of hydrothermal quartz. The results illustrate a new feature of luminescence from quartz for which lifetimes less than or greater than have never been reported at room temperature before. It is argued that the thermal provenance of the quartz and so the annealing it will have experienced influences the size of the observed lifetime. In particular, the results are explained in terms of a model consisting of three luminescence centers with the dominant lifetime linked to preferential recombination at one center depending on the thermal history of the sample and hence the hole concentration of the center.
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  • Date Issued: 2007

Time-resolved luminescence from quartz: an overview of contemporary developments and applications

  • Authors: Chithambo, Makaiko L , Pagonis, Vasilis , Ankjærgaard, Christina
  • Date: 2016
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/124743 , vital:35658 , https://doi.org/10.1016/j.physb.2015.10.014
  • Description: Time-resolved optical stimulation of luminescence has become established as a key method for measurement of optically stimulated luminescence from quartz, feldspar and α-Al2O3:C, all materials of interest in dosimetry. The aim of time-resolved optical stimulation is to separate in time the stimulation and emission of luminescence. The luminescence is stimulated from a sample using a brief light pulse and the emission monitored during stimulation in the presence of scattered stimulating light or after pulsing, over photomultiplier noise only. Although the use of the method in retrospective dosimetry has been somewhat limited, the technique has been successfully applied to study mechanisms in the processes leading up to luminescence emission. The main means for this has been the temperature dependence of the luminescence intensity as well as the luminescence lifetimes determined from time-resolved luminescence spectra. In this paper we review some key developments in theory and applications to quartz including methods of evaluating lifetimes, techniques of evaluating kinetic parameters using both the dependence of luminescence intensity and lifetime on measurement temperature, and of lifetimes on annealing temperature. We then provide an overview of some notable applications such as separation of quartz signals from a quartz–feldspar admixture and the utility of the dynamic throughput, a measure of luminescence measured as a function of the pulse width. The paper concludes with some suggestions of areas where further exploration would advance understanding of dynamics of luminescence in quartz and help address some outstanding problems in its application.
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  • Date Issued: 2016

Time-dependent characterization of graphene quantum dots and graphitic carbon nitride quantum dots synthesized by hydrothermal methods

  • Authors: Nxele, Siphesihle Robin , Nyokong, Tebello
  • Date: 2022
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/230917 , vital:49831 , xlink:href="https://doi.org/10.1016/j.diamond.2021.108751"
  • Description: We report on the facile synthesis of graphene quantum dots (GQDs), nitrogen-doped quantum dots (NGQDs) and graphitic carbon nitride quantum dots (gCNQDs) by the bottom-up hydrothermal synthetic process. The time is varied to study its effects on the structural, hydrodynamic and optical properties of these nanostructures. The techniques used to characterize these nanostructures were transmission electron microscopy, X-ray diffractometry, dynamic light scattering, and zetametry (zeta potential), and by energy dispersive X-ray, UV/vis, fluorescence, Fourier transform infrared, Raman and X-ray photoelectron spectroscopies. For gCNQDs and NGQDs, Raman spectroscopy showed an increase in disorder with synthesis time, indicating introduction of more triazine groups for the former and increase in doping with the N atoms for the latter, hence higher temperatures are recommended. For GQDs, Raman spectra showed an increase in the spatial order of the π-conjugated structure with synthesis time. Considering all the techniques employed in this work, the synthesis times of 6h and 8 h are recommended for GQDs and NGQDs.
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  • Date Issued: 2022

Ties that bind: the ambiguous role played by social capital in black working class first-generation South African students’ negotiation of university life

  • Authors: Vincent, Louise , Hlatshwayo, M
  • Date: 2018
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/141722 , vital:37999 , DOI: 10.20853/32-3-2538
  • Description: In this article we examine the ambiguous role that social capital plays in first generation Black working class South African students’ negotiation of entry into an elite higher education institutional environment. First generation student experiences have a particular relevance in South Africa where student enrolment increased by 193 000 between 1993 and 2004, with many of the new entrants first-generation students. South African research on first-generation working class Black students has focused on the low proportion of these students who reach university at all and among those who do enter university, the significant number who perform poorly or drop out before completing their degrees. The role played by social capital (social networks, close friends, associations, clubs and other affiliations) in these students’ experiences of negotiating their entry into university has been little explored.
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  • Date Issued: 2018

Three new pentacyclic triterpenoids from twigs of Manniophyton fulvum (Euphorbiaceae)

  • Authors: Mbeunkeu, Ahri B D , Noundou, Xavier S , Krause, Rui W M , Teinkela, Jean E M , Laatsch, Hartmut , Azebaze, Anatole G B , Vardamides, Juliette C , Tala, Michel F
  • Date: 2018
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/126782 , vital:35922 , https://doi.org/10.1016/j.phytol.2018.06.019
  • Description: Phytochemical investigation of the methanol extracts of the twigs of Manniophyton fulvum has led to the isolation and characterization of three new pentacyclic triterpenoids, designated as 3α,28-dihydroxyfriedelan-1-one (1), manniotaraxerol A (3) and manniotaraxerol B (4), along with fourteen known compounds, 3α-hydroxy-1-oxofriedelane (2), betulinic acid (5), friedelin (S1), taraxerol (S2), a mixture of stigmasterol (S3) and β-sitosterol (S4), herranone (S5), docosanoic acid (S6), ursolic acid (S7), nasutin B (S8), bergenin (S9), stigmasterol-3-O-β-Dglucopyranoside (S10), 1,2-di-O-palmitoyl-3-O-(6-sulfo-α-D-quinovopyranosyl)glycerol (S11), and aridanin (S12). The structures of all compounds were determined by comprehensive spectroscopic analyses (1D and 2D NMR, EI and ESI-MS). 3α,28-Dihydroxyfriedelan-1-one (1), 3α-hydroxy-1-oxofriedelane (2), manniotaraxerol A (3), manniotaraxerol B (4), and betulinic acid (5) were evaluated against HeLa (human cervix adenocarcinoma) cancer cells. Manniotaraxerol A (3) showed weak in vitro cytotoxicity with a cell viability value of 49.3%. Betulinic acid (5) also showed significant cytotoxicity against HeLa cell with a cell viability value of 4.0%; the other compounds were inactive in this test.
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  • Date Issued: 2018

Three new biological control programmes for South Africa: Brazilian pepper, Tamarix and Tradescantia

  • Authors: Byrne, Marcus J , Mayonde, Samalesu , Venter, Nic , Chidawanyika, Frank , Zachariades, Coates , Martin, Grant D
  • Date: 2021
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/414490 , vital:71152 , xlink:href="https://hdl.handle.net/10520/ejc-cristal-v10-n1-a7"
  • Description: Three weed biological control (biocontrol) programmes are described, all of which are considered to be ‘transfer projects’ that were initiated elsewhere, and on which South Africa has piggybacked its biocontrol efforts. Using knowledge and expertise from international collaborators, South African weed researchers are following a long tradition of transfer projects, which has been a largely successful and practical approach to biocontrol. Two Brazilian weeds, the Brazilian pepper tree Schinus terebinthifolia and the spiderwort Tradescantia fluminensis are being targeted, along with the Old-World trees Tamarix ramosissima and T. chinensis. The potential biocontrol agents are described and ranked for the two trees according to what has been discovered elsewhere, while the agent already released against T. fluminensis is rated (as poor), and other potential agents are considered. The addition of molecular techniques, climate matching and remote sensing in transfer projects can increase the chance of successful biocontrol and the inclusion of these techniques in the three new programmes is discussed. Transfer projects are a cost-effective and pragmatic way to pick winning biocontrol programmes.
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  • Date Issued: 2021

This is our story: iconography of carved doors and panels in Òyó Palace

  • Authors: Fọlárànmí, Stephen
  • Date: 2018
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/145698 , vital:38459 , https://0-doi.org.wam.seals.ac.za/10.1162/afar_a_00402
  • Description: This saying or prayer is one of the numerous expressions among the Yorùbá about the door and its significance, not only as a physical and important aspect of their architecture, but also in their language and culture. It also alludes to its pride of place as perhaps the most decorated element of Yorùbá architecture. From private homes, to the homes of the rich, shrines, and palaces, Yorùbá doors are usually imbued with a considerable array of images and icons that proclaims the owner's identity, religion, occupation. The Yorùbá are not unique in this respect. For example, among the Dogon, the door is as important as the house on which it is affixed. The granary, according to Willett (2002: 176), protects the the food stored inside it, while the door is seen or referred to as an element not only for physical protection, but also as a spiritual means of warding off unwanted spirits. It is reasonable, therefore, to expect the door to receive aesthetic attention by embellishment with an array of images.
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  • Date Issued: 2018
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