1,721,025 research outputs found
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
The occurrence, transport mechanisms, and removal of silver nanoparticles in the water environment
Full text linkThere is a heightened concern from communities on silver nanoparticles (AgNPs) disposal from industrial products into the water environment because of their toxicity to aquatic habitats. Aeration and coagulation methods to remove AgNPs have limitations such as complicated procedure involvement and the use of toxic materials. Hence, adsorption has the potential to be a simple and greener method to remove AgNPs. The aim of this study was to evaluate the occurrence, transport mechanisms, and removal of AgNPs in water environment. Water samples were collected from two sewage treatment plants (STPs), Melana River, and Skudai River. Effects of AgNPs on bacteria isolated from the rivers and STPs were also investigated. Transport mechanism of AgNPs in river was evaluated using constructed river model as a pilot study. AgNPs removal from the water via two different activated carbons derived from oil palm shell (ACfOPS) and coconut shell (ACfCS) were examined. In this respect, adsorption mechanism of AgNPs onto the proposed activated carbons was evaluated using physio-chemical approaches. In terms of kinetic behaviors, evaluation of nine kinetic adsorption models using six statistical indicators were scrutinized. Specific analytical methods namely UV-Vis spectrophotometer, FTIR, FESEM and SEM-EDX, and molecular analysis have been employed to gather the objectives. This study found that the concentration of AgNPs in the rivers and STPs ranges from 0.1 to 10.2 mg/L and 0.1 to 20.0 mg/L, respectively. AgNPs have antibacterial capability against all examined bacteria depending on their size and bacteria types. In the transport mechanism inspection, this study found that about 95% of the entering AgNPs into the river system was transmitted via the effluent. ACfOPS and ACfCS removed up to 99% of AgNPs from the water. The interaction mechanism between AgNPs and the activated carbon surface was mainly due to electrostatic force interaction via binding Ag+ with O- presented in the activated carbon to form AgO. Experimental adsorption data can be best described using the mixed 1,2-order kinetic model. Furthermore, this study also found that the proposed model outperformed existing kinetic models that share the same number of parameters. Findings from this study are useful for the monitoring of AgNPs in water environment and providing a method to remove AgNPs
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
Penilaian keberaliran hidraulik untuk makroliang buatan melalui kaedah wooding dan penyelesaian songsang
Full text linkThe present study was carried out to investigate artificial macropore as an alternative structural measure to reduce surface runoff. Disturbed soils were sampled to determine soil texture and conduct soil column experiment. Initial water content, saturated hydraulic conductivity, residual water content, dry bulk density, and organic matter contents were measured from undisturbed soil samples. Field infiltration was measured by using tension disc infiltrometer with three different pressure heads i.e. -5, -2, and 0 cm H2O. Wooding's solution was then used to estimate unsaturated hydraulic parameters. The result of Wooding’s solution was then used as initial estimates of optimized van Genuchten-Mualem hydraulic parameters by inverse solution using cumulative infiltration data. Soil column experiment, 20 cm in diameter and 20 cm in height, was carried out to investigate water flow in the soil with an artificial macropore for sandy clay loam and loam soil. HYDRUS 2D/3D was employed to design an artificial macropore and to simulate the water flow. Determination coefficients (R2) for cumulative infiltration from observation and simulation are found to be 0.98-0.99. In addition, R2 for drainage from observation and simulation are in the order of 0.99. Increasing macropore diameters (0, 5, 8 and 10 cm) for the both soil textures were found to increase total drainage and cumulative infiltration. Increasing macropore lengths (0, 10, 20 and 10 cm) for the both soil texture were found to increase total drainage and cumulative infiltration. Increasing initial water contents (12%, 20% and 25%) for the sandy clay loam and loam soil (15%, 20% and 25%) were found to increase total drainage but to decrease the cumulative infiltration. Artificial macropore in sandy clay loam and loam soil proved to infiltrate much water compared without macropore. The study on hydraulic conductivity using Wooding and inverse solutions succesfully revealed that an artificial macropore has the potential to be an alternative structural measure to reduce surface runoff
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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