1,720,956 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Sedimentation and its effects on selected small dams in Lusaka province, Zambia
Get PDFMSC NATURAL RESOURCESIn Zambia, the need to conserve water resources through technologies that can easily be managed by the local communities has resulted in the construction of small dams. However, small dams are adversely impacted by sedimentation due to soil erosion in the catchment area. The aim of this study was to assess the water storage capacity loss for the selected small dams due to sedimentation in Lusaka Province. The studied small dams were; Lwiimba, Silverest, Morester and Katondwe dam. Data was collected by bathymetric survey for each small dam using hydrographic boat with echo sounding. The shape and area of each reservoir were determined by mapping reservoir perimeter with a boat equipped with DGPS, by taking several position points along the shore line. The initial storage capacity data were collected from the dam owners and through interviews with three key informants on the effects of sedimentation on dam uses and on the existence of sediment control measures. Analysis of data involved determination of reservoir surface area and storage capacities using the Area and Volume tool under ArcGIS 3-D Spatial Analyst. The deposited sediment volume was estimated by subtracting the measured storage capacities from the initial storage capacities of reservoirs. Thematic analysis was applied in analysing the effects of sedimentation on dam uses and the existence of sediment control measures. Results of the study revealed that the measured reservoir storage capacities for Lwiimba, Silverest, Morester and Katondwe dams were 101,051.43 m3, 368,331.5 m3, 14,724.32 m3 and 10,714.88 m3, respectively. The estimated sediment volumes equivalent to storage capacity loss for each dam were; Lwiimba (99,044.57 m3), Silverest (379,480.5 m3), Morester (13,805.68 m3) and Katondwe dam with 9,937.12 m3.The accumulation of these sediment volumes have led to capacity losses, drying of reservoirs especially in the dry season and reduced life spans of the dams. The estimated rates of sedimentation for Silverest dam was found to be 14,595.40 m3yr-1. At this rate, the reservoir lifespan was 26 years; Lwiimba (2,200.99 m3yr-1), with the lifespan of 46 years; Katondwe (283.92 m3yr-1), 38 years, and for Morester dam the rate was 251.01 m3yr-1 giving a lifespan of about 58 years. Natural vegetation cover was found to be the main sediment control measure used in the catchments to reduce sediment deposition by runoff. It is concluded that the studied small dams are seriously affected by high rates of sedimentation from the time of their construction. This calls for periodic dredging of deposited sediment in small dams in order to increase reservoir storage capacity for sustainable use of the water resources. More sedimentation studies need to be conducted in Zambia
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
An integrated framework for hydrology-hydrodynamic modelling of the Barotse floodplains, upper Zambezi river basin.
Get PDFThesis of Doctor of Philosophy in Integrated Water Resources Management.In recent years the demand for improved assessments tools to help in understanding the wetland hydrological and hydrodynamic processes for the Barotse floodplains is ever increasing especially with the advent of climate change/variability. Despite several studies in the Upper Zambezi Basin, there was an absence of an integrated online (internal) framework for coupling hydrology and hydrodynamic model to be used to improve modelling of the Barotse floodplains. The objectives of this study were: (i) To investigate the mechanisms of groundwater-surface water interaction in the Barotse floodplains, (ii) To develop a rainfall runoff hydrologic model for Upper Zambezi River basin focusing on modelling Barotse floodplain, (iii) To develop an integrated hydrologic-hydrodynamic online (internal) coupling modelling framework for Barotse floodplains and (iv) To test and evaluate the performance of an online one-way Barotse Coupled Hydrological-Hydrodynamic Model developed based on the framework in objective iii. The study used field data sets, models, remote sensing data, and secondary data to address the objectives at hand. Based on the study objectives, the study has shown that the interaction between groundwater and surface water does occur in the Barotse Floodplain as evidenced by hydro-chemical and isotopic results. Such kind of groundwatersurface water interaction in floodplain, among other factors play a role in the hydrological and hydrodynamic modelling of the Barotse floodplains system. This postulation is partly supported by the results of simulated flows generated by wflow hydrological model, for the upstream gauge stations the results were closely matched the observed flow as indicated by the evaluation statistics; Chavuma, nse =0.738; kge = 0.738; pbias = 2.561 and rsr = 0.511; Watopa, nse=0.684; kge = 0.816; pbias = 10.577 and rsr = 0.557; Lukulu, nse=0.736; kge = 0.795; pbias = 10.437 and rse = 0.509. However, despite that wflow model was able to simulate the upstream hydrology very well, wflow model statistical objective function results of the downstream Barotse Floodplain gauge station (at Senanga) were not as good as the upstream results as indicated by evaluation statistics: nse = 0.132; kge = 0.509; pbias = 37.740 and rse = 0.923. The observed inaccuracy in goodness of fit between observed and simulated at Senanga Gauge Station maybe attributed to model forcing data as well as to the fact the representation of both floodplain channels hydrodynamics and hydrological processes are necessary to correctly capture floodplain dynamics for groundwater dependent systems. This aspect also suggested that standalone hydrological models are not very suitable in modelling the flows of the of groundwater-surface water dependant tropical floodplains. To this effect, one-way online (internal) hydrologic-hydrodynamic coupling framework for Barotse Floodplain has been developed in this study. The coupled model output relatively performed better than a standalone hydrological results. The significant improvements in coupled model results were observed at the downstream gauge station at Senanga with noticeable improvement in nse which improved from 0.132 to 0.535, kge improved from 0.509 to 0.699 and pbias from 37.724 to 21.495 indicating reduced model over estimation. The water levels results output from the online Barotse hydrologic-hydrodynamic model coupling also relatively matched the observed water levels as demonstrated by the statistical goodness of fit objective functions results: Mongu, kge 0.792, rse 0.762, nse 0.55; Senanga; kge 0.6707, rsr 0.827, nse 0.503 and Lukulu, kge 0.630, RSR 0.644, nse 0.301. In addition to water levels comparisons, the simulated results
of coupled mode inundation area were compared with MODIS MOD09A1 imagery. The statistical objective functions were nse 0.637, kge 0.731, rsr 0.502 and pbias 25.234. In general terms, the statistical results of the simulated and observed data sets (flow, water level and inundated area) of the on-line hydrological-hydrodynamic coupled model falls within what is deemed to be a good performing model indicating that the integrated framework for online coupling of hydrology-hydrodynamic models for the Barotse floodplain was a successful in coupling the two models used in this study
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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