How do teachers characterise their teaching for conceptual understanding and procedural fluency?: a case study of two teachers
- Authors: Junius, Daniel Franscius , Danie Junius
- Date: 2013
- Subjects: Mathematics -- Study and teaching (Secondary) -- Namibia Mathematics -- Study and teaching -- Case studies
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: vital:1360 , http://hdl.handle.net/10962/d1001426
- Description: Over many years the practice or art of teaching Mathematics posed itself as, not only being different from the practice of teaching any other subject, but to have many challenges and opportunities that ask for exploration and understanding. Just after independence in 1990, Namibia has embarked upon a reform process for the entire education system. Many changes were brought about to create a uniform, equal system for all. However, many challenges still remain to be addressed. Mathematics education remains one of the key areas where Namibian teachers can contribute towards the improvement of the subject. Unsatisfactory results, under-qualified teachers, and a negative disposition towards Mathematics are some of the challenges. These challenges are not unique to Namibia. Across the globe psychologists, philosophers and educators continue to engage in debates and research projects in search of answers and solutions for the improvement of Mathematics education. Despite encountering numerous obstacles, many teachers are dedicated and achieve outstanding results with their learners. This thesis reports on a research project that focused on the Mathematics teaching practice of two teachers whose experiences can make a positive contribution to the improvement of Mathematics teaching in Namibia. Furthermore, this case study investigated and attempted to understand the Mathematics teaching practices of two proficient teachers who each claimed to have a specific and unique approach to teaching Mathematics. The one claimed to be mainly procedural in her Mathematics teaching, while the other one claimed to teach mainly in a conceptual manner. Both achieve very good results with their classes and attribute their own teaching orientations to a process of several experiences they went through as students and in their careers. The study revealed that both claims are substantiated and that each teacher was consistent in her claimed approach. Many challenges and constraints were encountered by both teachers, but in their unique and specific ways each teacher’s chosen teaching approach supported them to overcome these. It was evident from the findings that each teacher’s practice came about as an evolutionary process over an extended period of time. As many challenges and limitations are universal, it is believed that in sharing experiences, teachers can benefit from each other by improving their practice. It was clearly stated by both participants that the re-thinking of and reflecting on their own practices provided them with new insights and motivation. Peer support and sharing of practices contribute positively towards the improvement of the teachers’ classroom practices.
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- Date Issued: 2013
How much its own and to what end?: SADC and the culture of security and regional organisation in Southern Africa
- Authors: Bischoff, Paul, 1954-
- Date: 2013
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/161650 , vital:40650 , ISBN 9781134118656
- Description: This book aims to examine the conceptions and practices of security adopted by Regional Organisations (ROs) across the globe. Since the end of the Cold War, there has been an increased focus on regions as a relevant realm for security, with actors within regional contexts identifying a significant degree of interdependency between one another. As a consequence, international security has taken on a distinct regionally institutionalised character, as seen by the increase in calls for greater utilisation of ‘Chapter VIII: Regional Arrangements’ of the UN, in order to create a devolved UN-led system of global security management. However, the idea of a system of global security management is a remote prospect, because divergence seems to be as important as commonality in terms of regional security.
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- Date Issued: 2013
Hydrellia lagarosiphon Deeming (Diptera: Ephydridae), a potential biological control agent for the submerged aquatic weed, Lagarosiphon major (Ridl.) Moss ex Wager (Hydrocharitaceae)
- Authors: Martin, Grant D , Coetzee, Julie A , Baars, Jan-Robert
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/103912 , vital:32322 , https://doi.org/10.4001/003.021.0118
- Description: The leaf-mining fly, Hydrellia lagarosiphon Deeming (Diptera: Ephydridae), was investigated in its native range in South Africa, to determine its potential as a biological control agent for Lagarosiphon major (Ridl.) Moss ex Wager (Hydrocharitaceae), an invasive submerged macrophyte that is weedy in many parts of the world. The fly was found throughout the indigenous range of the plant in South Africa. High larval abundance was recorded at field sites with nearly all L. major shoots sampled ontaining larvae, with densities of up to 10 larvae per shoot. Adults laid batches of up to 15 eggs, usually on the abaxial sides of L. major leaves. The larvae mined internally, leaving the epidermal tissues of the upper and lower leaves intact. The larvae underwent three instars which took an average of 24 days and pupated within the leaf tissue, from which the adults emerged. Impact studies in the laboratory showed that H. lagarosiphon larval feeding significantly restricted the formation of L. major side branches. Based on its biology and damage caused to the plant, Hydrellia lagarosiphon could be considered as a useful biological control candidate for L. major in countries where the plant is invasive.
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- Date Issued: 2013
Identification of a uniquely southern African clade of coastal pipefishes Syngnathus spp.
- Authors: Mwale, Monica , Kaiser, Horst , Barker, Nigel P , Wilson, A B , Teske, Peter R
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/445499 , vital:74393 , https://doi.org/10.1111/jfb.12130
- Description: The taxonomic status of two southern African coastal pipefish species, Syngnathus temminckii and Syngnathus watermeyeri, was investigated using a combination of morphological and genetic data. Morphological data showed that S. temminckii is distinct from the broadly distributed European pipefish Syngnathus acus, and a molecular phylogeny reconstructed using mitochondrial DNA recovered S. temminckii and S. watermeyeri as sister taxa. The southern African species share an evolutionary origin with north‐eastern Atlantic Ocean and Mediterranean Sea species, including S. acus. These data support the existence of a distinct southern African clade of Syngnathus pipefishes that has diverged in situ to form the two species present in the region today.
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- Date Issued: 2013
Identity and origins of introduced and native Azolla species in Florida
- Authors: Madeira, Paul T , Center, Ted D , Coetzee, Julie A , Pemberton, Robert W , Purcell, Matthew F , Hill, Martin P
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/419313 , vital:71634 , xlink:href="https://doi.org/10.1016/j.aquabot.2013.07.009"
- Description: Azolla pinnata, an introduced aquatic fern, is spreading rapidly causing concern that it may displace native Azolla. It is now present in the Arthur R. Marshall Loxahatchee National Wildlife Refuge, the northernmost portion of the Florida Everglades. Because A. pinnata subspecies are native to Africa, Southeast Asia, and Australia, determining the actual geographic origin of the Florida exotic is important to the discovery of efficacious biological control agents. Both the exotic and native Azollas were examined using morphological and molecular criteria. Both criteria distinguished three A. pinnata subspecies with the Florida exotic matching the Australian A. pinnata subsp. pinnata. Molecular divergence between the A. pinnata subspecies indicates the three types should be considered separate species. The Florida native was characterized by both molecular and morphological methods as Azolla caroliniana. The discovery of a previously uncharacterized Ecuadorian Azolla, which appears to be a paternal ancestor of A. caroliniana, indicates that A. caroliniana is a hybrid species.
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- Date Issued: 2013
Impact of insecticides on the reproductive potential of false codling moth, Thaumatotibia leucotreta (Meyrick, 1913)(Lepidoptera: Tortricidae)
- Authors: Fullard, T , Hill, Martin P
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/406092 , vital:70238 , xlink:href="https://hdl.handle.net/10520/EJC141302"
- Description: False codling moth, Thaumatotibia leucotreta(Meyrick, 1913) (Lepidoptera: Tortricidae), is animportant pest on citrus in South Africa. Several new insecticides were screened for theirpotential negative impacts onT. leucotreta’s reproduction through topical insecticide applica-tions and detached fruit bioassays. Detached fruit bioassays showed that the registeredstandard concentration of Delegate®20 g/100 l and DPX-HGW86 35 ml/100 l caused femalesto oviposit significantly fewer eggs (P= 0.0016) than the controls. The same was found forthe registered concentration of Coragen® (P is less than 0.0001). Topical insecticide trials showed thatonly concentrations of Coragen®, at the registered field rate and above had an effect on themoths’ reproductive output (P is less than 0.0001). Alsystin®and Meothrin™, which were used asindustry standards, did not negatively affect the reproductive output of the moths duringtopical or detached fruit bioassay trials. This study helps to better understand the impor-tance of the application mode,i.e.directly on moths or fruit and implies secondary benefits tosome insecticide applications.
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- Date Issued: 2013
Impacts of a sub-lethal dose of glyphosate on water hyacinth nutrients and its indirect effects on Neochetina weevils
- Authors: Katembo, Naweji , Hill, Martin P , Byrne, Marcus J
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/417726 , vital:71481 , xlink:href="https://doi.org/10.1080/09583157.2013.839982"
- Description: A sub-lethal dose of a herbicide under field conditions was applied to determine if it stimulates an increase in water hyacinth nutrients, thereby increasing feeding intensity by Neochetina spp. weevils used as biocontrol agents of the weed. Nitrogen (N) and carbon (C) were measured and compared between sprayed plants and control plants. At one site (Delta Park), N levels were lower in the sprayed plants compared to the control plants both in the leaves and the crown. At the second site (Farm Dam), leaf N was also lower in the sprayed plants than in the control plants, while no difference was found in crown N. Mean number of feeding scars per cm2 at Delta Park was significantly higher on the sprayed plants compared to the control plants, while no significant difference was found at Farm Dam. At Delta Park, there was no correlation, however, between the number of weevil feeding scars and leaf N or C:N ratio in sprayed plants. In conclusion, the sub-lethal dose of glyphosate did not directly result in an increase in weevil feeding intensity but it can be recommended in an integrated control system to retard water hyacinth growth while conserving the weevil population.
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- Date Issued: 2013
Implementation of AES-64 connection management for Ethernet Audio/Video Bridging devices
- Authors: Dibley, James , Foss, Richard
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/426875 , vital:72397 , https://www.aes.org/e-lib/online/browse.cfm?elib=17014
- Description: AES-64 is a standard for the discovery, enumeration, connection management, and control of multimedia network devices. This paper describes the implementation of an AES-64 protocol stack and control application on devices that support the IEEE Ethernet Audio/Video Bridging standards for streaming multimedia, enabling connection management of network audio streams.
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- Date Issued: 2013
In search of the Holy Grail: youth media consumption and the construction of citizenship
- Authors: Steenveld, Lynette N
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/158597 , vital:40210 , https://hdl.handle.net/10520/EJC141601
- Description: Rather than support the democratic process, as in the ideal scheme of things it should be doing, journalism has become an alienating, cynicism-inducing, narcoticising force in our political culture, turning people off citizenship rather than equipping them to fulfil their democratic potential.
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- Date Issued: 2013
Influence of nanoparticle materials on the photophysical behavior of phthalocyanines
- Authors: Nyokong, Tebello , Antunes, Edith M
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/190450 , vital:44995 , xlink:href="https://doi.org/10.1016/j.ccr.2013.03.016"
- Description: This review presents recent data on the photophysical behavior of phthalocyanines when conjugated to quantum dots, gold and magnetic nanoparticles. In some cases such conjugates offer the possibility of being used in “combination therapy”, where two or more substances may be used for treating one disease. The review focuses on the effect that the presence of nanoparticles has on the excited and triplet state parameters of the phthalocyanines. Five tables listing these parameters are presented.
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- Date Issued: 2013
Inkcubeko Nendalo: a bio-cultural diversity schools education project in South Africa and its implications for inclusive Indigenous Knowledge Systems (IKS) Sustainability.
- Authors: Cocks, Michelle L , Alexander, Jamie K , Dold, Anthony P
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141187 , vital:37951 , DOI: 10.1177/0973408212475232
- Description: South Africa is currently the world’s third most biodiverse country, with one of the highest concentrations of threatened biodiversity in the world. Emerging research reveals the increasing pressure on this biodiversity with many wild resources continuing to be utilised for livelihood purposes even within urban environments. The Rio conventions, particularly the CBD, call for an integrated approach to conservation that incorporates local environmental knowledge and practices. In a bid to market itself as globally competitive, South Africa’s Curriculum 2005 (C 2005) is primarily focused on Western-based scientific knowledge, which sidelines the contribution of indigenous knowledge systems (IKS) and ignores the holistic nature of indigenous worldviews. The Inkcubeko Nendalo programme is designed to revitalise cultural identity, showing children the value of local indigenous knowledge and cultural environmental values.
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- Date Issued: 2013
Insights from experimental economics on local cooperation in a small-scale fishery management system:
- Authors: Aswani, Shankar , Gurney, Georgina G , Mulville, Sara , Matera, Jaime , Gurven, Michael
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/145437 , vital:38438 , DOI: 10.1016/j.gloenvcha.2013.08.003
- Description: Cooperation is central to collective management of small-scale fisheries management, including marine protected areas. Thus an understanding of the factors influencing stakeholders’ propensity to cooperate to achieve shared benefits is essential to accomplishing successful collective fisheries management. In this paper we study stakeholders’ cooperative behavioral disposition and elucidate the role of various socio-economic factors in influencing it in the Roviana Lagoon, Western Solomon Islands. We employed a Public Goods Game from experimental economics tailored to mimic the problem of common pool fisheries management to elucidate peoples’ cooperative behavior. Using Ostrom's framework for analyzing social-ecological systems to guide our analysis, we examined how individual-scale variables (e.g., age, education, family size, ethnicity, occupational status, personal norms), in the context of village-scale variables (e.g., village, governance institutions, group coercive action), influence cooperative behavior, as indexed by game contribution. Ostrom's framework provides an effective window for conceptually peeling back the various socio-economic and governance layers which influence cooperation within these communities.
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- Date Issued: 2013
Institutional Repositories and Regional Collaboration: the Content Pro IRX Implementation at SEALS
- Authors: Clarke, Roelien , Van der Walt, Wynand
- Date: 2013
- Language: English
- Type: Conference paper , text
- Identifier: vital:6977 , http://hdl.handle.net/10962/d1007310
- Description: Paper delivered at the Annual Innovative User Group South Africa (IUGSA) Conference held in Bloemfontein, University of the Free State, 13-15 November 2013
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- Date Issued: 2013
Institutions and economic research: a case of location externalities on agricultural resource allocation in the Kat River basin, South Africa. A Rejoinder
- Authors: Mbatha, Cyril N , Antrobus, Geoffrey G
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/143002 , vital:38184 , https://0-doi.org.wam.seals.ac.za/10.1080/03031853.2013.798069
- Description: In Mbatha and Antrobus (2008), an argument was put forward against an importation or adoption of universal models or general theorems to explain locally prevailing socio-economic conditions and predict outcomes in varied geographical contexts such as in the Kat River basin. In response to this argument a comment in this edition argues that our “results are caused by, metaphorically speaking, comparing apples and oranges. If, however, all of the relevant information is taken into account, a simple economic model may suffice to depict the situation within the KRV.” Here we illustrate that the comment comes from a misreading of basic details in the original discussion and in its construction and presentation of an alternative model of the KRV conditions the comment reiterates our original argument that general models and theorems are likely to fail to explain local intricacies primarily because they are not founded on local historical institutions.
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- Date Issued: 2013
Introducing a Critical Pedagogy of Sexual and Reproductive Citizenship: Extending the ‘Framework of Thick Desire'
- Authors: Macleod, Catriona I , Vincent, Louise
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/434411 , vital:73056 , ISBN 978-1-4899-8025-0 , https://www.taylorfrancis.com/chapters/edit/10.4324/9780203069141-7/introducing-critical-pedagogy-sexual-reproductive-citizenship-catriona-macleod-louise-vincent
- Description: In Michelle Fine’s influential 1988 paper,‘Sexuality, Schooling, and Adolescent Females: The Missing Discourse of Desire’, she examined the “desires, fears, and fantasies”(p. 30) shaping responses to sex education in the United States in the 1980s. Fine’s work encouraged a ‘turn to pleasure’in sexuality education research. This work focused on and critiqued Fine’s idea, elaborated below, of a ‘missing discourse of desire’in the education of young people and of young women in particular (see for instance Allen, 2004, 2005; Connell, 2005; Rasmussen, 2004, 2012; Tolman, 1994; Vance, 1993). Less taken up, however, was a second major thread in Fine’s 1988 paper, namely the ‘absence of entitlement’in which she argued that not only the absence of a discourse of desire but also the absence of “viable life options” for young women combined to produce their vulnerability (Fine, 1988, p. 49). Almost twenty years later, in a 2006 article, Fine, with Sara McClelland, revisited the missing discourse of desire, this time in the context of an educational crusade in the United States advocating Abstinence Only Until Marriage (AOUM) approaches to sexuality education.
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- Date Issued: 2013
Investigation of institutions for the implementation of the Dutywa Agripark Project in Mbashe Local Municipality in Eastern Cape Province, South Africa
- Authors: Ndita, Bongani Herschel
- Date: 2013
- Subjects: Agricultural development projects , Rangelands
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/24587 , vital:63210
- Description: The study investigated local institutions amongst Agri-park project beneficiaries: A case of Dutywa Agri-park in Mbashe Local Municipality. Specifically, the dissertation sought to: investigate formal and informal institutions pertaining to land, rangeland management and support services, extension services amongst Agri-park beneficiaries, and explore options with communities to strengthen these institutions for the application of the Agri-park projects. The role of local institutions in economic development has received steadily increasing attention from researchers, policy makers and development practitioners. , institutions can be defined as the formal and informal rules of the game that have been formulated to rule people‟s behaviour and transactions. Informal rules may include among others, customs, norms and standards, religion, indigenous law while formal rules may include laws, constitutions, policies, markets and firms. This study used a survey design, quantitative and qualitative research methodologies involving the use of questionnaire. The data for this study was collected from 114 households which are Agri-park project beneficiaries, the extension officer, project site manager and local economic development officer. The data were collected through face to face and telephonic interviews. Institutional Analysis and Development (IAD) framework and Statistical Package for Social Sciences (SPSS version 20.0) were used for descriptive analysis in order to identify the existing local institutions and how they should be strengthen. The results showed that a number of local institutions do exist. The main findings of this study were as follows: (1) Project beneficiaries were aware of their stakeholders and that they knew the roles and responsibilities of each stakeholder in the project. (2) Traditional leaders were aware about the project and that they have a major role to play. (3) Project beneficiaries have organized themselves into groups of co-operatives and their co-operatives are registered with the Department of Agriculture. (4) Project initiators are going to transfer the ownership of the project to these communities after it becomes well established. (5) There was a mutual agreement of youth employment rotation in the project between these four communities. (6) The condition of lease agreement for a land where the project currently running is 9 months renewable contract with the rental payment of R 6300.00 per annum. (7) The lease agreement gives the church a property right to reclaim the land should payments not be made. (8) Project beneficiaries possess some agricultural skills and that they have received various training. The study recommended that there is a need to strengthen these rules and regulation for the project to become more efficient and productive in the long-run. , Thesis (MSc) -- Faculty of Science and Agriculture, 2013
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- Date Issued: 2013
Is classical biological control a 20th century" old science" paradigm that is losing its way?
- Authors: Sheppard, Andy , Werner, K , Hill, Martin P , McEvoy, Peter , Fowler, Simon , Hill, Richard
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/425434 , vital:72239 , xlink:href="https://www.fs.usda.gov/research/treesearch/44754"
- Description: For years most countries accepted the benefits of biological control as given, leading to facilitated inside lanes through the regulatory maze. "Successes" led to many passionate disciples over science rationalists. Biocontrol targets continue to be selected on assumptions of good value with little direct evidence. Even when successful, biocontrol has rarely delivered environmental benefits that have been measured. Money flow is still healthy, but is arguably being directed against less impactful targets. Lack of science rigour exposes the field to attacks from an increasing number of critics as values change. A global change driven counter-revolution is underway on the dichotomy of hate between natives and aliens. Will climate change undermine even currently successful biocontrol outcomes? Meanwhile negative direct and indirect impacts of biological continue to fuel dissent. Nowhere is this issue hotter than in Hawaii where "invaders" have massively increased biodiversity, make up nearly all the biomass and create whole new ecosystems. This workshop will entertain a panel discussion around the future for classical biological control of weeds. Does it need to change its paradigm in response to changing societal values, if so can it reinvent itself?
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- Date Issued: 2013
Is Fairtrade in commercial farms justifiable?: its impact on commercial and small-scale producers in South Africa
- Authors: Jari, Bridget , Snowball, Jeanette D , Fraser, Gavin C G
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/69408 , vital:29519 , https://doi.org/10.1080/03031853.2013.847036
- Description: Fairtrade initially was limited to improving the lives of small-scale and peasant farmers, but later on it embraced commercial farmers, which attracted criticism. While there are a number of justifications for the Fairtrade organization's decision, there are authors who feel that meaningful “fair trade” cannot be achieved with the inclusion of commercial farms. This paper investigates the impact of Fairtrade on commercial farms and small-scale farmer cooperatives in South Africa. Fairtrade on South African commercial farms embraces a number of policy concerns related to land reform, BEE and sustainable development. The results of the study show that when commercial farms are included in the Fairtrade model, communities in which these farmers live benefit from developmental projects. In addition, in some instances, farm workers gain shares in the commercial farms, and benefit from the farm owners’ knowledge and capital.
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- Date Issued: 2013
IsiXhosa lexicography: past, present and future
- Authors: Nkomo, Dion , Wababa, Zola
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/67526 , vital:29108 , http://dx.doi.org/10.5788/23-1-1219
- Description: Publisher version , This article presents a panoramic and critical overview of isiXhosa lexicography and its impact on the intellectualisation of this indigenous South African language. The history of isi¬Xhosa lexicography dates back more than two centuries. However, there still exists a need for dic¬tionaries that serve the language-speaking community as practical tools for addressing diverse communication and learning-oriented needs in the current language policy dispensation. The Isi¬Xhosa National Lexicography Unit (XNLU) is currently working on dictionary projects that attempt to address this situation while at the same time not losing sight of the mandate that the Pan South African National Language Board (PanSALB) placed on all the National Lexicography Units (NLUs). For this to happen, the article argues that the NLU needs to put lexicographic prac¬tice into its historical perspective, i.e. conceiving dictionary projects in the light of existing diction¬aries and lexicographic traditions in the language. Over and above that, there is a need to take into account the recent developments in lexicographic research, adopt co-operative lexicographic prac¬tice and develop a dictionary culture among the isiXhosa-speaking community.
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- Date Issued: 2013
Karoo volcanic and intrusive rocks: Lesotho and Eastern Cape
- Authors: Marsh, Julian S
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/144890 , vital:38388
- Description: The Karoo Igneous Province is one of the classic Mesozoic continental flood basalt provinces. At present erosion levels it comprises numerous eroded remnants of an extensive, thick volcanic sequence (largely lava flows) and a well-exposed subvolcanic intrusive complex of dykes and sheets which are particularly abundant in the underlying Karoo sedimentary strata.
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- Date Issued: 2013