1,720,955 research outputs found
Biodegradation Potential of Oil-based Drill Cuttings Encapsulated with Cement in the Soil Environment
Get PDFBiodegradation potential of slabs made from oil-based drill cuttings encapsulated with cement in a soil environment has been experimentally investigated. Results of soil analyses show that physico-chemical and biological characteristics of the soil environment as; pH (5.6 – 3.9), temperature (27.7 – 39.5 oC), redox potential (-114mV – (-80mV), total organic carbon (12.7% - 7.3%), sulphate (0.7 – 0.2mg/l), nitrate (6.7 – 2.2mg/l), moisture content (82-89%) and total microbial count (105 – 1013 cfu/g). Experimental results shows a mass loss of oil base drill cuttings encapsulated with cement slab during the period of the study, indicating approximate linear relationship between mass loss and time. When the log of mass-loss is plotted against time, an approximate linear relationship is obtained confirming a first-order chemical reaction for the biodegradation process. Results of the analyses of the soil sample indicate an environment that has the potential to degrade cement encapsulated oil based drill cuttings. @JASEM
J. Appl. Sci. Environ. Manage. Dec, 2011, Vol. 15 (4) 643 - 64
Physico-chemical analyses and corrosion effect of produced water on low carbon steel
No full textThe corrosion effect of produced water on low carbon has been investigated using the weight loss technique. The composite produced water sample was found to contain pH (5.3), turbidity (82 NTU), conductivity (8920 Ns/cm), salinity (2394 mg/L), total iron (1.28 mg/L), carbonate (140 mg/L), nitrate (42.74 mg/L) and suphate (nil mg/L). At an exposure time in hours of 120, 240, 360, 480, 600, and 720, the corresponding calculated corrosion rates in many of the coupons were 0.077, 0.153, 0.204, 0.345, 0.352, and 0.370 respectively. Physico-chemical characteristics of the composite produced water sample used for the study has a higher concentration compared with DPR standard for discharge of produced formation water into surface environment.It was assumed that the corrosion of the coupons was due to presence of high chemical matters in the produced water sample.Keywords: corrosion, produced water, environment, rock, salinity, dissolved oxygen.Global Journal of Pure and Applied Sciences Vol. 11(4)2005: 511-51
Electricity consumers attitudes, knowledge and behaviour towards the use of energy saving bulbs in Warri, Nigeria: Implications for governmental action
Get PDFThis paper studies the electricity consumers attitudes, knowledge and behaviour towards the use of energy saving bulbs in Warri, Nigeria using the survey method. The survey randomly selected 400 respondents for the study, and information on their energy consumption and willingness to use energy saving bulbs were solicited using a well structured questionnaire. Results indicate a large majority (77%) of respondents agree that they do not practice any energy saving behaviour in their homes whilst 23% agreed that they practice energy saving in their homes. With respect to their willingness to use energy saving bulbs, 51% of the respondents are extremely willing to consume the product, and 49% were extremely unwilling to use energy saving bulbs. If energy saving bulbs costs consumers 10% more than candescent bulbs, 91% of respondents indicated they are extremely unwilling to consume it, while 53% were willing to consume same. Thus, it appears that respondents will respond to a price differential between energy saving bulbs and non-energy saving bulbs. The findings of this paper spells out the implications for governmental policy and action
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
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