1,721,353 research outputs found
World Environment Day: Guest Comment
Full text linkWorld Environment Day: Guest Comment by Dr. Swati Sharma, Reader and Staff Incharge, Department of Public Health Dentistry, School of Dental Sciences, Sharda University, Greater Noid
Optimization of carbon electrodes derived from epoxy-based photoresist
Full text linkIn this contribution we report on results from an optimization study of SU-8 photoresist derived carbon electrodes. SU-8 derived carbon tends to be glassy in nature, however, based on the exact pyrolysis strategy and other fabrication parameters employed one can obtain a range of electrical, electrochemical and thermal properties related to the variation of the graphitic content of the thus obtained carbon. Hence, in order to obtain electrodes that emulate or improve upon the performance of commercially available glassy carbon (GC) electrodes, the right choice of pyrolysis conditions, and fabrication parameters such as the polymer patterning method, the nature of the substrate, polymer precursor film thickness and dimensions of the electrodes are all important. Carbon electrodes made employing a variety of pyrolysis times and pyrolysis end temperatures, film thicknesses and substrates are investigated by cyclic voltammetry of a redox probe ([Fe(CN)(6)](4-)), resistance measurements and spectroscopic analysis (Raman and XRD). SU-8 derived carbon electrodes displayed a wide potential stability window even in acidic media comparable to that of commercially available GC electrodes. Finally, these electrodes were applied to the simultaneous detection of traces of Cd(II) and Pb(II) through anodic stripping voltammetry and detection limits as low as 0.7 and 0.8 mu gL(-1) were achieved
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
Study of different treatment methods on chicken feather biomass
No full textChicken feathers (CFs) make up to 10 % of total chicken dry mass and
they have many potential industrial applications. CFs contain protein fibers called
keratin, which is an insoluble protein. Primary sanitization phases are complex because
of the presence of many blood-borne microbes, pathogens, and parasites in raw biomass.
The extraction process of keratins from the unprocessed feathers is also a challenging
task. Prior to the extraction, the cleaning/sanitization of feathers is a very necessary step.
Thus, the present work was conducted to optimize an efficient surfactant for the cleaning
process of the CFs using ionic and non-ionic surfactants. The experiment was conducted
by the washing of feathers with double distilled water (ddH2O), detergents, ether, and
lastly with boiling water. The washed feathers were treated with surfactants (sodium
dodecyl sulfate (SDS), cetrimonium bromide (CTAB) and polyethylene glycol (PEG))
and the effect of each surfactant was analyzed by a microbiological test that indicates the
extent of the presence of different bacteria on the treated feathers. SEM, EDX, FTIR
were used to study the morphology and composition of untreated and treated CFs. SEM
showed no detectable fiber damage after treatment. Cetrimonium bromide (CTAB) (t3)
was one of the best surfactants recommended for the treatment of CFs among all the
surfactants used. The present study described the best treatment method for the CFs
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
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