• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 10701
  • 1692
  • 1609
  • 882
  • 584
  • 497
  • 287
  • 201
  • 176
  • 149
  • 141
  • 126
  • 124
  • 96
  • 91
  • Tagged with
  • 20881
  • 5589
  • 3163
  • 3005
  • 2635
  • 2092
  • 1563
  • 1504
  • 1493
  • 1401
  • 1305
  • 1254
  • 1118
  • 1105
  • 997
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
641

An evaluation of skills development in a sample of metal and engineering firms in Gauteng

Ribeiro, Marisa Ferreira January 2009 (has links)
Includes abstract. / Includes bibliographical references (leaves 121-127). / The metal and engineering industry is one of the most significant contributors to South Africa’s manufacturing employment and economic performance. In recent times though debate regarding the industry has centered on reported critical skills shortages, alluding to decreased employment and performance. Studies confirmed that skills shortages at artisan, technical, engineering and management levels existed with artisans representing the most critical skills shortage in the industry. This study evaluates the nature and extent of skills development taking place in a sample of metal and engineering firms located in the industry’s most significant province, Gauteng. Research was conducted through interviews with skills development representatives from a non-randomly selected sample of firms belonging to three categories in the metals beneficiation value chain, namely: raw material processing firms; intermediate product producing firms and finished product producing firms.
642

Investigating the relationship between land use and soil moisture variation in Suid Bokkeveld, South Africa

Umulisa, Viviane January 2015 (has links)
This study investigated the spatial variability of soil moisture as well as changes within the soil profile of different land use types in the Suid Bokkeveld, situated to the south-west of the Nothern Cape, South Africa. This area has been experiencing harsh weather conditions that affect local agricultural production and multiple livelihood activities. The primary aim of the research was to analyse the influence of land use adopted in response to weather and climate change by studying the effects of soil moisture variations in the area. The study found that, together with depth and soil particle size, different types of land use contribute to soil moisture variations. Out of the five types of land uses that were investigated, rooibos cultivated farms had the highest soil moisture variability. The second highest variability was found in grazing cultivated farms and the lowest in natural and grazing never cultivated land, respectively. The results confirm that the shift from rooibos tea and wheat cultivation to grazing has contributed to a reduction in soil moisture variations. The grazing cultivated and fallow system could therefore be an effective land use types to ensure water and soil conservation, reduce land degradation and adapt to weather and climate change. The significance of this study lies in it being one of the first explorations into soil moisture in this area. Other forcing factors will need to include building a comprehensive and integrated understanding of soil moisture variability based on multiple influencing factors.
643

Visualising climate change: the case of the intergovernmental panel on climate change's cover images

Claassens, Katrine Brink January 2016 (has links)
Climate change is an increasingly urgent problem. How it is communicated and represented are of interest to those seeking to understand action or inaction on the issue. There is increasing interest on how it is being communicated visually. This research speaks to the growing body of literature on the visual communication of climate change in order to contribute to the wider critical literature addressing the role of images in the communication of climate change. It does so by considering a neglected site of climate change imagery: the Intergovernmental Panel on Climate Change's (IPCC) report covers. The IPCC's report covers from the first ones in 1990, to the latest ones of 2014, are investigated in this quantitative and qualitative case study where the subject matter, both literal and symbolic of this (hitherto unexamined) body of images, is interrogated. This dissertation sought to identify and investigate what, exactly, the IPCC is using to visually represent and communicate climate change outside the realm of its scientific graphs and diagrams. It sought to compare these findings with the larger lexicon of climate change imagery and look at how the IPCC negotiates the communicational and representational problems inherent in the visual communication of climate change. The question ultimately asked was whether the IPCC's cover images are effective representations of climate change. What was found was that the IPCC images departed significantly from standard climate imagery. The conclusions drawn from the initial content and thematic analysis was that the IPCC images are frequently too banal, bland and decontextualized to be effective representations or communicators of climate change but do offer some potentially effective avenues overlooked in other representations.
644

Barriers and enablers to uptake and implementation of system of rice intensification: a case study of Mwea irrigation scheme in Kenya

Gicheru, Mercy Njeri January 2016 (has links)
It already seems preposterous to be able to sufficiently meet global food demand of the expected nine billion people by 2050 while at the same time maintain our emissions levels below 2ᵒC by the end of the century. This is more so for a continent such as Africa where much of this population is expected to arise from considering the fact that the continent is ranked to have the highest proportion of food insecure population. In order to overcome this challenge, we will need a total revolution of our agricultural production systems to systems that not only focus on increasing food production but also build our resilience to climate change. An example of one such practice is System of Rice Intensification (SRI) which is acclaimed to increase rice production while at the same time reducing the pressure on scarce water resources, minimizing agricultural greenhouse gases emissions and improving the farmers' households' adaptive capacity to climate change impacts by increasing their income. However, despite the success attributed to SRI, its uptake across Sub Saharan Africa is arguably low. This is puzzling considering the high proportion of food insecurity in the region and the region's susceptibility to damage from increased severity and frequency of climate extreme events such as droughts and floods due to its geographical positioning and the limited adaptive capacity of its people. In this work, the researcher sought to understand the barriers and enablers to the adoption of the System of Rice intensification in Mwea irrigation scheme (MIS) in Kenya. The findings show that most barriers to the uptake of SRI in MIS occur during the dissemination of SRI. Further critical barriers to the uptake of SRI in MIS were identified as follows: lack of formal SRI training, high costs of rice production, failure to involve key stakeholder institutions such as SACCOs while marketing SRI and farmer's age. Moreover, the study also depicted that most barriers to SRI adoption were intertwined, thus focusing on a single barrier would be myopic. Furthermore, enablers to the uptake of SRI in MIS are tied to the benefits of SRI pre-empted by lead farmers. This correlation implies that the benefits of SRI are key motivators for SRI adoption. Other enablers include training. However, informal training on SRI through social networks which play a crucial role at disseminating climate adaptation activities amongst small scale farmers, is marked with a lot of inconsistencies which makes it a barrier for SRI uptake. In this regard, we advise that SRI trainers clearly highlight the activities involved in SRI and their resultant benefits during initial SRI information dissemination.
645

Assessing the vulnerability of South Africa's national protected areas to climate change

Coldrey, Kevin 18 February 2019 (has links)
Protected areas should be reviewed under expected future climate conditions so that conservation and expansion strategies can be developed appropriately. An assessment of the vulnerability of protected areas to climate change is a necessary step in developing such strategies. Indeed, a vulnerability assessment is an important step in developing adaptation strategies for conservation. This is important as substantial climate change has already been experienced at a park level in South Africa. The aim of this study was to develop a method for assessing the relative vulnerability of protected areas to climate change and to apply this to South Africa’s 19 national parks. The method includes identifying and quantifying potential impacts of climate change on each focal protected area, carried out by developing and/or using projections for species, ecosystems, infrastructure, tourism and neighbouring communities. Potential impacts were combined with measures of each park’s adaptive capacity to develop an overall park vulnerability score. This study has taken vulnerability assessment at a protected area level further than has been attempted before by assessing not only the biophysical but also the socioeconomic impacts of climate change on a protected area, quantifying the potential changes (potential impacts) and developing a relative index. The results indicate that climate change has the potential to contribute significantly to the threats faced by South Africa’s national parks. Apart from a potentially devastating impact on species and ecosystems, the effects on tourism demand, community relations and infrastructure are of concern. Not surprisingly, the most vulnerable parks are largely coastal, where tourist infrastructure is at risk of both flooding and sea-level rise, and there are higher population densities. Furthermore, coastal ecosystems are expected to transform significantly which will have consequences for range-restricted species. Management strategies need to take heed of the magnitude of potential impacts identified in this study and work towards developing adaptation pathways.
646

A historical perspective on wind data: time, space and vector relationships between ship log data and Cape Royal Astronomical Observatory wind data between 1834 and 1854

Brown, Alexa January 2017 (has links)
This dissertation assesses the extent to which data from the Climatological Database for the World's Oceans (CLIWOC) reflect newly digitized historical wind data captured at the Royal Astronomical Observatory (RAO) in Cape Town, South Africa from 1834-1854. This follows the historical precipitation reconstructions for Southern Africa by Hannaford et al. (2015), using wind data from the CLIWOC database. This project also forms part of a bigger project that is recovering and digitising historical instrumental meteorological data for Southern Africa that have never been analysed before. For Southern Africa, the opportunity to compare historical instrumental data seldom arises due to the paucity of reliable data. However, there is an opportunity to analyse and compare two different wind data sources for a twenty-one year cross over period for south western Africa. Wind, as an indicator of atmospheric conditions, has not been assessed extensively in South African, therefore this project fills an academic gap in historical climatology for the region, and provides newly digitised historical data. Digitisation and pre-processing steps ensure that the RAO dataset is comparable to the CLIWOC dataset. This is done by replicating wind direction and speed measurement conversions and formatting (Garcia-Herrera et al., 2005), and by mirroring the available time steps of data in each dataset (eliminating data were the other dataset has erroneous or missing data). Spatially scattered data recorded over the sea compared to data recorded at a fixed position introduces inherent limitations, error and noise into the data comparison. Therefore, to eliminate as many uncertainties as possible and minimise the noise in the data, the CLIWOC data are refined further by a) a single observation per day, b) separating three regions of differing seasonal synoptic air flow regimes (west coast, south west peninsula and south coast) and c) all analyses based on seasonally grouped data. Temporal, spatial and vector relationships are established for each season using scatter plot graphs and Pearson correlations. The different relationships between the data are derived from corresponding wind data (i.e. data of the same day and time), in each dataset for wind speed and wind direction separately. No significant correlation (all p values>0.05) or signal is evident over time, or as the difference in distance changes. However, seasonality is represented consistently in the wind vector distribution heat maps. Significant findings include the observations of anomalous north westerly winds in summer at the RAO, where the CLIWOC data did not pick up similar data for the corresponding region on the west coast. Historical wind data used herein prove to be reliable by the expected seasonal synoptic flow patterns and characteristics seen in each study region. There is no correlation between the datasets over time and space and the data do not present any clear signals or return events over time. Although corresponding data do not show any correlations, there are typical synoptic flow regimes in each study region which prove that wind data was recorded correctly. Therefore, the datasets are mutually exclusive, but accurate in their intrinsic value. It is only the anomalous summer north westerlies at the RAO which question the reliability of the data, as the same wind regimes were not identifiable in the corresponding CLIWOC data. This anomaly was noted but not studied further. This project highlights the major inconsistencies and limitations in the CLIWOC data. Researchers in the future should use CLIWOC data appropriately to suit the research question and be aware of the inconsistencies that may introduce noise.
647

Ethical consumption among Cape Town students: a qualitative study

McMahon, Molly January 2016 (has links)
Much of current research on ethical consumption biases the North - South relationship of Northern consumers being considered ethical based on their purchasing of items from Southern producers. This establishes the dominant perspective of ethics needing to be expressed toward the distant other and to be based in a specific object, often typified by Fair Trade. These conditions of ethics have led to the assumption that Southern consumers lack ethics in their consumption. Thus this research seeks to expand the current understanding of ethical consumption to include ethics at home and ethics of care, as well as expand the demographic of ethical consumption studies to include Southern consumers. The aim of this research is to add to the developing understanding of Southern ethical consumption through the exploration of ethics in grocery shopping among students. Students from various universities in the Cape Town area were observed while grocery shopping and interviewed about their shopping habits and their thoughts on ethics and values, particularly in terms of consumption and food. Twenty - eight students were interviewed, and of those, 23 were also observed shopping. At the conclusion of this study, it is evident that students, as Southern consumers, do express ethical consideration in their consumption habits. This is based on both perspectives of ethical goods and ethical practices. However, they are more apt to act on the ethics of care at home than on the ethics of care at a distance. The strongest trends among students are thrift, care at home and care for self, as well as a significant draw toward s shopping local and supporting local producers based in their communities and nationally. The implications of this research are that it adds to the literature through its theorization within the Global South, its focus on ethical consumption as a practice instead of solely object - based and the discussion of students as a research demographic. Overall, this study demonstrates how Southern consumers do express ethics in their shopping choices particularly through care at home.
648

Reimagining Climate Change: Visualizing the Future of Sustainability

Unknown Date (has links)
The world’s path to climate change is inevitable. Activists and legislators, all around the world, are actively working to slow down this process or stop changes. Technology is moving toward a sustainable future of renewable energy and resources to lighten the impact that the human population has on the climate. Whether or not these efforts will slow down the changing climate is unknown, but the world’s scientists, engineers, and designers are preparing for any scenario that comes our way. This thesis uses graphic design to visualize the future of humanity adapting to climate change. Topics that are explored include controlled-environment agriculture, vertical farming, sustainable food production, advancements in the medical industry, advancements in transportation, and sustainable energy production. These elements will come together, in my projects, to visualize one possible future of living in Arizona, where living conditions have become inhospitable for life as we know today. / Includes bibliography. / Thesis (M.F.A.)--Florida Atlantic University, 2020. / FAU Electronic Theses and Dissertations Collection
649

The late holocene vegetation history of Lake Farm, South Eastern Cape Province, South Africa

Adams, Terence Gilbert January 1994 (has links)
Bibliography: p. 155-175. / Palynological analysis of organic sediments from a freshwater lake near Port Elizabeth (34°S,25°30'E) has provided a high- resolution vegetation history of the area for the last 2200 years. Detailed identification and counting of the fossil pollen resulted in the generation of a pollen diagram. Changing frequencies in fossil pollen over time are represented, and inferences are made regarding environmental conditions which influenced the vegetation. A detailed narrative of vegetation history in response to environmental change is presented, and this is compared to results from related studies. The significance of the Lake Farm study site has been noted in terms of its location as a 'zone of convergence' for a variety of vegetation types. Results of fossil pollen analysis indicate that environmental conditions prior to 1 500BP were drier than at present. Forest and fynbos vegetation were not well-represented in the pollen spectrum at this time, and it is suggested that they were not favoured by these conditions. Environmental conditions ameliorated after 1500BP, becoming more mesic, which favoured the proliferation of both forest and fynbos vegetation types. At present xeric and grassland elements are declining, while shrubs increase, indicating an enhanced human-induced disturbance regime. It is suggested that the partial decline in forest elements at present 1s most likely attributable to human-induced disturbance of the environment. The introduction of exotic trees has been noted (approx. 280BP) and is seen to have coincided with the influx of european settlers to the region. Principal Components Analysis has revealed that the vegetation distribution in the area has been most heavily influenced by human activity and moisture availability. The necessarily subjective interpretation of the statistical results, however, casts some doubt on the validity of the conclusions drawn. The validity of the conclusions drawn from this study becomes apparent not only in terms of what is learned about the history of forests, but also the form any future management should take.
650

Vulnerability of horticulture producers to climate variability and change : the case of Chókwe District, Mozambique

Vilissa, Delfim Julio January 2016 (has links)
Climate change is projected to have continued and globally severe environmental, economic and socioeconomic effects. These effects are forecast to be more severe in the agriculture sector, considering that it is one of the most sensitive industries to climate change. Studies from the Mozambican National Institute for Disaster Management (INGC) suggest that Mozambique is among the countries highly vulnerable to climate change due to its geographical location, in the coastal zone. In addition, the majority of its population is entirely dependent on agriculture activities for food and income. For example, in the Chókwe district, tomato production plays a key role in farmers' livelihood; however, this district is prone to weather variability and climate stresses, affecting the region's agricultural performance and making farmers' livelihood even more precarious. There is indeed limited information on this vulnerability, how farmers cope with the risks as well as their need to manage these stresses. The study conducted includes a survey of 43 farmer households in two villages of Chókwe: Massavasse and Muianga. The study then compares farmers' perceived effects of climate variability with actual climate data observed between 1980 and 2012. Meteorological data was analyzed using R software.

Page generated in 0.0592 seconds