1,721,317 research outputs found
Replication data for: Curriculum Reforms and Infant Health
No full textDursun, Bahadir, Eren, Ozkan, and Nguyen, My, (2024) “Curriculum Reforms and Infant Health.” Review of Economics and Statistics 106:2, 394–408
Adsorption Isotherm Measurement and Correlation of Toluene and n-Hexane on Activated Carbon in an Aqueous Solution / by Nguyen My Anh Hoa, QD 501 .H678 2005
Full text linkThenumber of hazardous waste disposals reported has increased in recentyearsdue to improper
management of chemical generated by chemical and petrochemical industries. Volatile organic
compounds are one of the major pollutants to the environment. Two of the volatile organics
compounds selected for this study are toluene and n-hexane are The adsorption measurement in
aqueous solutions has been carried out by using batch system at 35°C, 55°C and 65°C with the
range of initial concentration between 10 to 200ppm. There are three types of activated carbon
that have been used, which are Granular Activated Carbon (GAC) 2.5mm, Granular Activated
Carbon 0.25mm, and Powder Activated Carbon.
The objectives of this study are to determine the adsorption isotherms of toluene and n-hexane
on activated carbon through the adsorption process, to investigate the effect of temperature on
the adsorption capacity of toluene and n-hexane, and to model the experimental adsorption
isotherm databy using the established adsorption isotherm equations on activated carbon.
The equilibrium concentrations have been analyzed using UV-Vis Spectrophotometer and Gas
Chromatography with Purge and Trap after the solutions were adsorbed for 24 hours.
The toluene adsorption isotherm has the S-shaped form and of type V isotherm based on the
classification of Brunaeur, Deming, Deming and Teller (BDDT). Among the three temperature
conditions, it is found that the adsorption favors the lowest temperature (35°C). This indicates
that adsorption process is exothermic, lower the temperature will shift the adsorption
equilibrium to adsorption rather than desorption. GAC 2.5 mm is found to have the highest
adsorption capacityamongthe others. It is impossible to carry out the experimentwith n-hexane
due to its high volatility. The amount of n-hexane is considered negligible in aqueous solution
and adsorption process does not require.
Freundlich isotherm is the most popular model which is widely used in the correlation of liquid
adsorption. Sips isotherm which is the combination between Langmuirand Freundlichequation
is an alternative model. However, the techniques were not successful with toluene isotherm
measurement
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
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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