1,721,376 research outputs found
Catchment parameter analysis in flood hydrology using GIS applications
Full text linkCITATION: Gericke, O. J. & Du Plessis, J. A. 2012. Catchment parameter analysis in flood hydrology using GIS applications. Journal of the South African Institution of Civil Engineering, 54(2):15-26.The original publication is available at http://www.scielo.org.zaENGLISH ABSTRACT: The use of Geographical Information Systems (GIS) has permeated almost every field in the
engineering, natural and social sciences, offering accurate, efficient, reproducible methods for
collecting, viewing and analysing spatial data. GIS do not inherently have all the hydrological
simulation capabilities that complex hydrological models do, but are used to determine many
of the catchment parameters that hydrological models or design flood estimation methods
require. The purpose of this study was to perform catchment parameter analysis using GIS
applications available in the ArcGISTM environment. The paper will focus on the deployment of
special GIS spatial modelling tools versus conventional manual methods used in conjunction
with standard GIS tools to estimate typical catchment parameters, e.g. area, average catchment
and watercourse slopes, main watercourse lengths and the catchment centroid. The manual
catchment parameter estimation methods with GIS-based input parameters demonstrated an
acceptable degree of association with the special GIS spatial modelling tools, but proved to
be sensitive to biased user-input at different scale resolutions. GIS applications in an ArcGISTM
environment for the purpose of catchment parameter analyses are recommended to be used as
the standard procedure in any proposed hydrological assessment.http://www.scielo.org.za/scielo.php?script=sci_abstract&pid=S1021-20192012000200002&lng=en&nrm=iso&tlng=enPublisher's versio
SUNSAT: South Africa’s first satellite in space
Full text linkThe original publication is available at http://www.satnt.ac.za/CITATION: Schoonwinkel, A., Milne, G. W., Du Plessis, J. & Mostert, S. 2002. SUNSAT: Suid-Afrika se eerste satelliet in die ruimte. Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie, 21(3):90-100, doi: 10.4102/satnt.v21i3.233.AFRIKAANSE OPSOMMING: Die SUNSAT-satelliet is as navorsing- en ontwikkelingsprogram aan die Universiteit van Stellenbosch bedryf van 1992 tot 2001. Dit
het nuwe tegnologie vir Suid-Afrika verwerf en internasionaal ’n nuwe werkverrigtingsvlak ten opsigte van mikrosatelliete se
beeldwaarnemingsvermoëns daargestel. SUNSAT het ook internasionale amateurradiokommunikasie en ruimtewetenskaplike
eksperimente ondersteun. Tydens die ontwikkelingsfase het meer as 100 nagraadse studente hul tesisonderwerpe op SUNSAT geskoei,
en ’n gepaardgaande wetenskapbewusmakingsprogram het meer as 50 000 skoliere bereik. Hierdie artikel gee ’n oorsig oor die
samestelling van die satelliet en sluit af met ’n toekomsvisie vir satelliettegnologie in Suid-Afrika.ENGLISH ABSTRACT: The SUNSAT satellite was conducted as a research and development programme at Stellenbosch University from 1992 till 2001. It obtained new technology for South Africa and set new performance levels internationally with regard to micro-satellites. SUNSAT also supported amateur radio communications internationally, as well as space physics experiments. During the development phase more than 100 postgraduate students based their theses on SUNSAT, and a supplementary science awareness programme reached more than 50 000 learners. This article provides an overview of the satellite configuration and concludes with a vision for satellite technology in South Africa.http://www.satnt.ac.za/index.php/satnt/article/view/233Publisher's versio
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Scoping phase comparison of development opportunities by making use of publicly available sustainability information
Full text linkCITATION: Du Plessis, J. A. & Bam, W. G. 2017. Scoping phase comparison of development opportunities by making use of publicly available sustainability information. Procedia Manufacturing, 7:207-214, doi:10.1016/j.promfg.2017.02.026.The original publication is available at https://www.sciencedirect.comWith sustainable business strategies and sustainability reporting now a norm, the public domain has in recent years been flooded with sustainable development information from a wide range of organizations. Although this information is generally retrospective in nature, an opportunity exists to make use of this information to compare the impact of different development opportunities prospectively, based on the performance of similar industries elsewhere. This paper therefore evaluates the potential of using publicly available sustainability information to enhance scoping phase decision-making by policymakers in order to prioritize projects that have the most potential for creating sustainable outcomes. The paper outlines a concept model for using sustainability information to compare development opportunities, followed by an analysis of five prominent international sustainability reporting frameworks at the hand of specific criteria to establish which framework would be most suitable to serve as basis for such a model.https://www.sciencedirect.com/science/article/pii/S235197891730032XPublisher's versio
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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