Nanoscale research in South Africa: A mapping exercise based on scientometrics

This article reports the findings of a scientometric analysis of nanoscale research in South Africa during the period 2000–2005. The ISI databases were identified as the most appropriate information platform for the objectives of the investigation and have been interrogated for the identification of South African authors publishing in the field. The article identifies trends over time, major institutional contributors, journals in which South African authors publish their research, international collaborators and performance in comparison to four comparator countries (India, Brazil, South Korea and Australia). The major findings of the investigation are as follows: nanoscale research in South Africa is driven by individual researchers interests up to date and it is in its early stages of development; the country’s nanoscale research is below what would one expect in light of its overall publication output; the country’s nano-research is distributed to a number of Universities with subcritical concentration of researchers.     

Research emphasis and collaboration in Africa

Scientific co-authorship of African researchers has become a fashionable topic in the recent scientometric literature. Researchers are investigating the effects, modes, dynamics and motives of collaboration in a continental research system which is in an embryonic stage and in different stages of development from country to country. In this article we attempt to provide some additional evidence by examining both patterns of collaboration at country and continental levels and the scientific disciplines emphasised. Our findings indicate that the continent’s research emphasises medical and natural resources disciplines to the detriment of disciplines supporting knowledge based economies and societies. Furthermore, we identify that the collaborative patterns in Africa are substantial higher than in the rest of the world. A number of questions related to research collaboration and its effects are raised.     

Is fundamentalism a threat to science? Evidence from scientometrics

This article aims to provide scientometric evidence in order to confirm or refute the statement that the “rise in literalist religious thinking in the 1990s devastated science in the Islamic world by promoting the idea that all knowledge could be found in the Koran” published in a Special Report in the New Scientist and to map the literature related to fundamentalism over time and space during the last ten years. We find that despite the rise of fundamentalism, science was thriving in eight Islamic countries (Iran, Jordan, Indonesia, Egypt, Turkey, Malaysia, Morocco, and Pakistan) during the period and hence the statement is refuted. The mapping of the “fundamentalist” literature indicates that there are a constant number of articles per year (60 to 70) covering disciplines ranging from religion and sociology to political sciences and international relations. The center of research is revealed to be the Anglo-Saxon world with epicenter the USA. Finally, we identify that the debate of fundamentalism versus science is in an embryonic stage.     

Positive emotions in psychotherapy theory, research, and practice: New kid on the block?

This article introduces the Special Section, which explores the potential importance of positive emotions in our theory, research, and practice. The authors propose that the peripheral role that psychotherapy theory, research, and practice has allotted to the variable "positive emotion" can be understood in terms of the foundational axioms of our discipline. The authors argue that psychotherapy has implicitly adopted an attitude of caution and suspicion toward the potential therapeutic value of experiencing positive emotions, an all embracing attitude toward the therapeutic value of experiencing negative emotions, and an identity focused on healing psychological wounds at the expense of promoting psychological well-being. The authors trace the adoption of these axioms to Judeo-Christian ideas of human nature and to the identity formation process of psychotherapy, and the authors speculate on the sociopolitical forces that have promoted a shift in our theorizing in the last few decades. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Scientometrics of a pandemic: HIV/AIDS research in South Africa and the World

The HIV/AIDS pandemic is of international interest with the 2008 Nobel Prize in physiology or medicine having being awarded for the discovery of the virus that causes AIDS. South Africa has a particular interest in the field of HIV/AIDS research as it is the country with the largest number of HIV infections in the world and the issue has created a number of political and scientific debates. This investigation identifies the state of HIV/AIDS related research in South Africa vis-a-vis the rest of the world using evaluative scientometrics in order to inform relevant policy. South Africa is identified as producing an increasing number of HIV/AIDS related publications, making it one of the most prolific fields in the country. The rest of the world appears to have stabilized its research efforts after the development of highly active antiretroviral therapies. The USA is identified as the main producer of HIV/AIDS research while Europe appears to under-emphasise the issue. Comparison of the world??s most prolific universities with those in South Africa identifies that the latter has a fragmented system. A number of policy issues are discussed.     

Energy-Efficient Routing for Connection-Oriented Traffic in Wireless Ad-Hoc Networks

We address the problem of routing connection-oriented traffic in wireless ad-hoc networks with energy efficiency. We outline the trade-offs that arise by the flexibility of wireless nodes to transmit at different power levels and define a framework for formulating the problem of session routing from the perspective of energy expenditure. A set of heuristics are developed for determining end-to-end unicast paths with sufficient bandwidth and transceiver resources, in which nodes use local information in order to select their transmission power and bandwidth allocation. We propose a set of metrics that associate each link transmission with a cost and consider both the cases of plentiful and limited bandwidth resources, the latter jointly with a set of channel allocation algorithms. Performance is measured through call blocking probability and average energy consumption and our detailed simulation model is used to evaluate the algorithms for a variety of networks.     

The development impact of solar cookers: A review of solar cooking impact research in South Africa

Solar cooking is often considered “a solution looking for a problem”. Solar cookers have long been presented as an interesting solution to the world's problem of dwindling fuel wood sources and other environmental problems associated with wood fuel demand for cooking. However, recent GTZ field work in South Africa showed different benefits instead: the use of solar cookers resulted in appreciable fuel and time savings as well as increased energy security for households using commercial fuels. These observations are based on field tests in South Africa that started in 1996 to investigate the social acceptability of solar cookers and to facilitate local production and commercialisation of the technology. Impact studies and use rate studies have been carried out by a number of different organisations since the inception of the project and although commercialisation of the technology has not been achieved to its fullest potential, impact studies indicate that solar cookers have a positive development impact on households through fuel-, energy- and time savings. The article aims to summarise the findings of the various studies and present an overview of use rates and impact data. A variety of factors influence solar cooker use rates, which in turn determine impacts. Some factors are related to the user, some to the environment in which the cooker is used and some to the cooker itself. Ultimately, the data shows that on average, only 17% of solar cooker owners do not use their stoves after purchase and that active solar cooker users utilise their stoves on average for 31% of their cooking incidences. Since the majority of solar stove buyers actually use their stoves and obtain real benefits, this suggests that that solar cookers are indeed not a solution looking for a problem but a solution worth promoting.     

Multiobjective analysis in modeling the petrochemical industry

The structuring of the petrochemical industry has been considered both as a single objective and as a multiobjective problem. Three objective functions have been considered: The maximization of the thermodynamic availability change, the minimization of the lost work and the minimization of the feedstock consumption. The first two objectives aim at structuring the industry for “optimum” energy utilization, while the third aims at the optimum utilization of raw materials. The single objective analysis provided three optimum structures that constitute bounds of the actual performance of the petrochemical industry. The multiobjective analysis on the other hand provides the process designer a set of alternative solutions and subjective criteria have to be used in order to select the “best”.     

The behaviour of aged three‐way catalytic converters in the different modes of legislated cycles

Automotive three‐way catalytic converters are routinely applied today in the elimination of carbon monoxide, urburned or partially burned hydrocarbons and nitrogen oxides from gasoline engine exhaust gas. Catalyst activity in this case is only indirectly assessed by means of the measurement of overall emissions during a legislated driving cycle. The specific structure of the driving cycles embodied in a legislated emissions test procedure, significantly affects catalyst performance. In addition, catalyst behaviour is affected by the levels of raw engine emissions and catalyst inlet temperatures. The latter are strongly influenced by exhaust system design. The above explain easily the difficulties arising when one wants to discriminate between the behaviour of different catalysts in a specific test procedure. The advent of reliable mathematical models of three‐way catalytic converter operation allows for a detailed analysis of catalyst performance over the full legislated cycle, which gives more insight into the catalytic activity itself. In this paper, a specific experimental and computational case study is employed to demonstrate the role of mathematical modelling in the detailed analysis of aged catalyst performance during the US and EU legislated test procedures. Copyright © 2000 John Wiley & Sons, Ltd.     

Directed Evolution of Phi Class Glutathione Transferases Involved in Multiple-Herbicide Resistance of Grass Weeds and Crops

The extensive application of herbicides in crop cultivation has indisputably led to the emergence of weed populations characterized by multiple herbicide resistance (MHR). This phenomenon is associated with the enhanced metabolism and detoxifying ability of endogenous enzymes, such as phi class glutathione transferases (GSTFs). In the present work, a library of mutant GSTFs was created by in vitro directed evolution via DNA shuffling. Selected gstf genes from the weeds Alopecurus myosuroides and Lolium rigidum, and the cereal crops Triticum durum and Hordeum vulgare were recombined to forge a library of novel chimeric GSTFs. The library was activity screened and the best-performing enzyme variants were purified and characterized. The work allowed the identification of enzyme variants that exhibit an eight-fold improvement in their catalytic efficiency, higher thermal stability (8.3 °C) and three-times higher inhibition sensitivity towards the herbicide butachlor. The crystal structures of the best-performing enzyme variants were determined by X-ray crystallography. Structural analysis allowed the identification of specific structural elements that are responsible for k_cat regulation, thermal stability and inhibition potency. These improved novel enzymes hold the potential for utilization in biocatalysis and green biotechnology applications. The results of the present work contribute significantly to our knowledge of the structure and function of phi class plant GSTs and shed light on their involvement in the mechanisms of MHR.