1,720,976 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
Fabrication of PLA/COW dung-based biocomposite
Full text linkVarious environmental drawbacks such as reduction in land fill space and nonbiodegradability lead to systematically investigate the replacing of synthetic composites by using biocomposites. Biocomposites possess suitable characterizations such as light weight, combustible, nontoxic, and biodegradability behavior. However, the final product of the biocomposites carries certain drawbacks in terms of mechanical, physical and thermal properties. In order to determine their characteristic, this research aided to figure out the possibility of applying cow dung (CD) as filler to prepare polylactic acid (PLA) biocomposite. The main objective of this research is to obtain a suitable composition ratio based on the filler and the hosting polymer. The CD of two different sizes, namely 4.00 mm and 0.5 mm were blended with PLA. PLA/CD biocomposites with different CD ratios (0-60 wt.%) were fabricated using an internal Brabender mixer (W50EHT-3zones) followed by a 40 tones hydraulic compression moulding. The results showed that the addition of CD led to improve flexural properties compared to tensile and impact strength. Biocomposites with 4.00 mm CD (bigger filler) mainly showed higher mechanical properties than those of 0.5 mm CD (smaller filler). Scanning electron microscopy (SEM) of tensile and impact fractured surfaces indicated that the bigger fillers had stronger adhesion and bonding with the matrix. Moreover, the cavities and rough surface of biocomposites increased with the filler content addition. This led to lower mechanical and physical properties of the biocomposites and increased water uptake during water absorption test accordingly. Dynamic mechanical analysis (DMA) technique was also followed to determine both storage and loss modulus of the samples. Neat PLA indicted the lowest storage modulus, while the filler content addition generally improved the storage modulus. Results of hermogravimetric analysis (TGA) indicated that the addition of the filler content prolonged the major degradation temperature. This was due to the higher resistance of the CD filler to the degradation temperature, which induced higher thermal stability of CD compared to the neat PLA
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
Polysaccharide-based magnetic nanocomposites as drug carriers for potential colorectal cancer treatment
No full textColorectal cancer is one of the most diagnosed malignant diseases in the world. The green-based, multifunctional, and highly biocompatible polysaccharide-based magnetic nanocomposites (PMNCs) as smart drug carriers can satisfy targeted cancer treatments to circumvent off-target cytotoxicity from conventional chemotherapy. This comprehensive research has sought to introduce five different green-based 5-Fluorouracil (5-FU) drug carriers, including Fe3O4 nanoparticles stabilized with Punica granatum fruit peel extract (Fe3O4/P. granatum/5-FU), rice straw cellulose fiber (CF/5-FU), magnetic cellulose fiber (MC/5-FU), cellulose nanocrystals (CNC/5-FU), and chitosan-coated magnetic CNC (CH/MCNC/5-FU) bionanocomposites. For this aim, spherical Fe3O4 nanoparticles was produced by a facile co-precipitation technique and using four different weight percentages of Punica granatum fruit peel extract as a green stabilizer. Then, the rod-shaped CF was isolated from rice straw waste by employing bleaching and alkali treatments. Fe3O4 nanoparticles were supported onto the CF matrix to fabricate MC nanoocmposites. The needle-like CNC was isolated from rice straw cellulose by the acid hydrolysis process. In addition, the ionic gelation method and the sodium tripolyphosphate cross-linker were used to fabricate layer-by-layer bionanocomposites of CH/MCNC/5-FU. The successful fabrication of the samples with desired physiochemical properties was indicated by X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersion X-ray spectroscopy (EDX), dynamic light scattering (DLS), thermogravimetric analysis (TGA), vibrating-sample magnetometry (VSM) of the swelling analysis, and ultraviolet-visible (UV) spectroscopy. The use of 2 weight % extract as stabilizer and capping agent appropriately decreased the size of spherical Fe3O4 NPs with enhanced stability and anticancer effects. Compared to CF/5-FU formulation, CNC/5-FU showed higher crystallinity, smaller size, and prolonged drug release at targeted pH media. The PMNCs samples of MC/5-FU and CH/MCNC/5-FU showed multifunctional physiochemical properties and also magnetic and heat-responsive manner. The use of chitosan coating in CH/MCNC/5-FU improved drug encapsulation efficiency and controlled drug release at various pH and heat induction conditions. From images of TEM and SEM, the size of all the synthesized samples was estimated to be below 80 nm, showing their potential usage in nanodrug delivery systems. In in vitro anticancer assay, the fabricated Fe3O4/P. granatum/5-FU, CF/5-FU, and CNC/5-FU desirably exhibited negligible damage against CCD112 normal cells and appropriate anticancer actions against HCT116 colorectal cancer cells. MC/5-FU with magnetic targeting and heat induction improved the anticancer effects, guide ability, and tolerable toxicity in targeted drug delivery systems. Further, CH/MCNC/5-FU showed not only high biocompatibility but also caused enhanced selectivity and elimination of the cancer cells. In conclusion, the fabricated the fabricated Fe3O4 nanoparticles, polysaccharides, PMNCs as innovative, low-cost, and topical nanodrug formulations could offer promising potential to tackle most, if not all, of the conventional drug delivery issues in colorectal cancer therapy
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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