1,720,957 research outputs found
Lecheate physico-chemical parameters removal efficiency and possible alternative treatment options to Kiteezi landfill treatment facility
No full textA thesis submitted to the Directorate of Research and Graduate Training in partial fulfilment of the requirements for the award of the Degree of Master of Science in Integrated Watershed Management of Makerere University.Sanitary landfills generate large quantities of highly polluted leachate, which is a major environmental, economic and social concern. Further, the treatment of landfill leachate constitutes a challenge that may vary considerably depending on the age of the landfill. This study was aimed at evaluating the removal efficiency and determine a best treatment option for the landfill leachate to meet Uganda's national standards for safe effluent discharge to the surrounding environment. The specific objectives were to; determine the efficiency of the current treatment plant at Kiteezi in terms of leachate quality and determine the best treatment option for the treatment of the leachate from the Kiteezi landfill. The performance evaluation of the Kiteezi activated sludge facility included, a weekly assessment of the physico-chemical parameter reduction efficiency of the raw, and treated leachate from March 5 to July 23, 2020. The best treatment option was established by comparing two treatment options: lateritic soil and activated carbon amended with sand, by varying the combination of their particle sizes (0.25-0.5 mm, 0.5-1 mm, and 1-4 mm) with their column lengths (30 cm, 45 cm, 60 cm, and 75 cm).The study showed that the current Kiteezi landfill activated sludge treatment was only effective for the treatment of the turbidity (90.4 ± 6.4 %). This was due probably to the halving of the total phosphorus (TP) and total suspended solids (TSS), which were very high in the raw leachate. For other Physico-chemical parameters, the values in the effluent increased. For example, the value of the pH was 8.75 ± 0.13 at the inlet and 9.67 ± 0.17 at the outlet. The concentration of total nitrogen (TN) was 190 ± 50.2 mg/L and increased to 6,749 ± 1,595 mg/L. For the chemical oxygen demand (COD) and the color of the leachate, their values remained more or less the same before and after treatment; color was 15,182 ± 2,649 PtCo at the inlet and 16,008 ± 1,710 PtCo at the outlet, and COD was 31,362 ± 5,844 mg/L at the inlet and 32,218 ± 963 mg/L at the outlet. This poor treatment efficiency could be due to the composition of the sludge as well as the lack of oxygen in the aeration tank. For the best treatment option, this study showed that lateritic soil was more effective than activated carbon in reducing all the Physico-chemical parameters of the leachate. The effluent quality met the effluent discharge standards set by the National Environment Management Authority of Uganda. The maximum reduction efficiency was achieved with the combination column length of material of 75 cm associated with particle size range 0.25-0.5 mm.REFORM INTRA AFRICA MOBILITY SCHEM
Dynamique migratoire et developpement territorial dans la commune littorale de thiaroye sur mer (Senegal)
No full text<p>Cette contribution fait la corrélation entre migration et développement territorial. La zone d'étude Thiaroye sur mer est une commune littorale, urbaine composée majoritairement de pêcheurs, de commerçants et d'artisans. A l'image des autres communes du Sénégal, elle se retrouve confrontée à des problèmes de chômage, d'équipements, d'aménagement, de développement territorial, etc. Cet article se base sur des enquêtes de terrain auprès des migrants de la commune, mais aussi chez les personnes ressources comme les autorités et les familles. Elles se sont effectuées avec l'outils kobocollect et le traitement des données s'est appuyé sur le logiciel Excel et la cartographie sur Quantum Gis. Les migrants dans la commune de Thiaroye sur mer sont essentiellement des adultes âgés entre 30-35 ans et sont majoritairement des hommes 87% avec un niveau d'étude primaire. Les résultats ont montré que la majorité des migrants à Thiaroye sont soit pêcheurs (26%) soit des commerçants (25%). Ces deux secteurs d'activités englobent la moitié des expatriés de la commune. Cela témoigne des difficultés que ces activités rencontrent. Cependant, la migration a des impacts positifs sur ces activités notamment la pêche avec l'achat de matériels de pêche (moteur, pirogue, filet…). Pour réduire le chômage, les migrants investissent dans l'élevage avec l'achat de bétail pour la pratique de l'élevage 23 %, le commerce 29 %, la pêche et aviculture 18 % chacune et le maraichage 12 %. </p>
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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