1,721,251 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
Formation Of A Supramolecular Gel Between α-cyclodextrin And Free And Adsorbed Peo On The Surface Of Colloidal Silica: Effect Of Temperature, Solvent, And Particle Size
No full textAqueous solutions of a-cyclodextrin (α-CD) complex spontaneously with poly(ethylene oxide) (PEO), forming a supramolecular structure known as pseudopolyrotaxane. We have studied the formation of the complex obtained from the threading of α-CD onto PEO, both free in solution and adsorbed on colloidal silica. The kinetics of the reaction were studied by gravimetric methods and determined as a function of temperature and solvent composition for the PEO free in solution. PEO was then adsorbed on the surface of colloidal silica particles, and the monomers were displaced by systematically varying the degree of complexation, the concentration of particles, and the molecular weight of the polymer. The effect of the size of the silica particles on the yield of the reaction was also studied. With the adsorbed PEO, the complexation was found to be partial and to take place from the tails of the polymer. The formation of a gel network containing silica at high degrees of complexation was observed. Small-angle X-ray and neutron scattering experiments were performed to study the configuration of the polymeric chains and confirmed the partial desorption of the polymer from the surface of the silica upon complexation.202191249129Szejtli, J., (1996) Comprehensive Supramolecular Chemistry, 3, p. 12. , Atwood, J. L., Davies, J. E. D., MacNicol, D. D, Vogtle, P., Eds.Pergamon: ExeterWenz, G., (1994) Angew. Chem., Int. Ed. Engl., 33, p. 803Rusa, C.C., Luca, C., Tonelli, A.E., (2001) Macromolecules, 34, p. 1318Rusa, C.C., Bullions, T.A., Fox, J., Porbeni, F.E., Wang, X., Tonelli, A.E., (2002) Langmuir, 18, p. 10016Harada, A., Li, J., Kamachi, M., (1993) Nature, 364, p. 516Lo Nostro, P., Lopes, J.R., Ninham, B.W., Baglioni, P., (2002) J. Phys. Chem. B., 106, p. 2166Fujita, H., Ooya, T., Yui, N., (1999) Macromolecules, 32, p. 2534Harada, A., (1996) Coord. Chem. Rev., 148, p. 115Szejtli, J., (1998) Chem. Rev., 98, p. 1743Huh, K.M., Ooya, T., Lee, W.K., Sasaki, S., Kwon, I.C., Jeong, S.Y., Yui, N., (2001) Macromoleculea, 34, p. 8657Li, J., Harada, A., Kamaohi, M., (1994) Polym. J., 26, p. 1019Sabadini, E., Cosgrove, T., Taweepreda, W., (2003) Langmuir, 19, p. 4812Fleer, G.J., Cohen Stuart, M.A., Scheutjens, J.M.H.M., Cosgrove, T., Vincent, B., (1993) Polym. Interfaces, , Chapman and Hall: LondonJoseph, J., (2001), PhD Thesis, University of BristolKing, S.M., Small-angle neutron scattering (1999) Modern Techniques for Polymer Characterisation, p. 171. , Dawkins, B. R. A. P. a. J. V., Ed.John Wiley and Sons, Ltd: New YorkLo Nostro, P., Lopes, J.R., Cardelli, C., (2001) Langmuir, 17, p. 4610Chou, S.I., Shah, D.O., (1981) J. Colloid Interface Sci., 80, p. 49Van Der Beek, G.P., Cohen Stuart, M.A., Cosgrove, T., (1991) Langmuir, 7, p. 327Lafuna, F., Wong, K., Cabane, B., (1991) J. Colloid Interface Sci., 143, p. 9Killmann, E., Maier, H., Kaniut, P., Gutling, N., (1985) Colloids Surf., 15, p. 261Hone, J.H.E., Cosgrove, T., Saphiannikova, M., Obey, T.M., Marshall, J.C., Crowley, T.L., (2002) Langmuir, 18, p. 855Amu, T.C., (1982) Polymer, 23, p. 1775Candia, F., Vittoria, V., Bianchi, U., Paltrone, E., (1972) Macromolecules, 5, p. 493Dormidontova, E.E., (2002) Macromolecules, 35, p. 987Rusa, C.C., Tonelli, A.E., (2000) Macromolecules, 33, p. 1813Taweepreda, W., (2004), Ph.D. Thesis, University of Bristol, in preparation. Similar results for β-CD have also been published recently by Maccarrone et al. Physica B, in pressnot
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
No full textWe 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
More On Polypseudorotaxanes Formed Between Poly(ethylene Glycol) And α-cyclodextrin
No full textA new interpretation for the mechanism associated with the spontaneous threading of α-CD, onto a PEG chain followed by the supramolecular hydrogel formation, is described. Beyond a specific stoichiometry, the complexation of α-CD and PEG results in the formation of a two-phase system. Besides the phase separation, for PEG with a molecular weight higher than 6000 Da, part of the polymer chains are unthreaded by the α-CD, leading to the formation of a supramolecular hydrogel. The kinetics for the complexation and the determination of the yield for equilibrated systems consisting of PEG (linear and star) are used to investigate the number of α-CD threaded before and after the phase separation. The results are compared with the prediction obtained from the application of the Poisson distribution and reveal the ratio between α-CD and PEG in each step of the process. Additionally, the kinetics for the hydrogel formation and its inner structure are investigated by using the proton NMR spin-spin relaxation of water. © 2013 American Chemical Society.291546644669Harada, A., Kamachi, M., Cyclodextrin-based supramolecular polymers (1990) Macromolecules, 23, pp. 2821-2823Wenz, G., Han, B.H., Müller, A., Cyclodextrin rotaxanes and polyrotaxanes (2006) Chem. Rev., 106, pp. 782-817Harada, A., Takashima, Y., Yamaguchi, H., Cyclodextrin-based supramolecular polymers (2009) Chem. Soc. Rev., 38, pp. 875-882Harada, A., Okada, M., Kawaguchi, Y., Kamachi, M., Macromolecular recognition: New cyclodextrin polyrotaxanes and molecular tubes (1999) Polym. Adv. Technol., 10, pp. 3-12Harada, A., Supramolecular assemblies through macromolecular recognition by cyclodextrins (1996) Supramol. Sci., 3, pp. 19-23Ceccato, M., Lonostro, P., Baglioni, P., α-cyclodextrin/polyethylene glycol polyrotaxane: A study of the threading process (1997) Langmuir, 13, pp. 2436-2439Sabadini, E., Cosgrove, T., Taweepreda, W., Complexation between α-cyclodextrin and poly(ethylene oxide) physically adsorbed on the surface of colloidal silica (2003) Langmuir, 19, pp. 4812-4816Sabadini, E., Cosgrove, T., Inclusion complex formed between star-poly(ethylene glycol) and cyclodextrins (2003) Langmuir, 19, pp. 9680-9683Dreiss, C.A., Cosgrove, T., Newby, F.N., Sabadini, E., Formation of a supramolecular gel between α-cyclodextrin and free and adsorbed PEO on the surface of colloidal silica: Effect of temperature, solvent, and particle size (2004) Langmuir, 20, pp. 9124-9129Huh, K.M., Ooya, T., Lee, W.K., Sasaki, S., Kwon, I.C., Jeong, S.Y., Yui, N., Supramolecular-structured hydrogels showing a reversible phase transition by inclusion complexation between poly(ethylene glycol)-grafted dextran and α-cyclodextrin (2001) Macromolecules, 34, pp. 8657-8662Li, J., Harada, A., Kamachi, M., Transition during inclusion complex formation between α-cyclodextrin and high molecular weight poly(ethylene glycol)s in aqueous solution (1994) Polym. J., 26, pp. 1019-1026Cardoso, M.V.C., Carvalho, L.V.C., Sabadini, E., Solubility of carbohydrates in heavy water (2012) Carbohydr. Res., 353, pp. 57-61Harada, A., Li, J., Kamachi, M., Kitagawa, Y., Katsube, Y., Structures of polyrotaxane model (1998) Carbohydr. Res., 305, pp. 127-129Pozuelo, J., Mendicuti, F., Mattice, W.L., Inclusion complexes of chain molecules with cycloamyloses. 2. Molecular dynamics simulations of polyrotaxanes formed by poly(ethylene glycol) and α-cyclodextrins (1997) Macromolecules, 39, pp. 3385-3690Rusa, C., Tonelli, A.E., Separation of polymers by molecular weight through inclusion compound formation with urea and α-cyclodextrin hosts (2000) Macromolecules, 33, pp. 1813-1818Huang, L., Allen, E., Tonelli, A., Inclusion compounds formed between α-cyclodextrins and nylon 6 (1999) Polymer, 40, pp. 3211-3221Turro, N.J., Yekta, A., Luminescent probes for detergent solutions. A simple procedure for determination of the mean aggregation number of micelles (1978) J. Am. Chem. Soc., 100, pp. 5951-5952Tait, C.N., Davies, D.M., Polypseudorotaxanes from scratch (2002) Langmuir, 18, pp. 2453-2454Weickenmeier, M., Wenz, G., Threading of cyclodextrins onto a polyester of octanedicarboxylic acid and polyethylene glycol (1997) Macromol. Rapid Commun., 18, pp. 1109-1115Lo Nostro, P., Giustini, L., Fratini, E., Ninham, B.W., Ridi, F., Baglioni, P., Threading, growth, and aggregation of pseudopolyrotaxanes (2008) J. Phys. Chem. B, 112, pp. 1071-1081Bonini, M., Rossi, S., Karlsson, G., Almgren, M., Lo Nostro, P., Baglioni, P., Self-assembly of α-cyclodextrin in water. 1. Cryo-TEM and dynamic and static light scattering (2006) Langmuir, 22, pp. 1478-1484Nelson, A., Jack, K.S., Cosgrove, T., Kozak, D., NMR solvent relaxation in studies of multicomponent polymer adsorption (2002) Langmuir, 18, pp. 2750-2755Sierra-Martin, B., Choi, Y., Romero-Cano, M.S., Cosgrove, T., Vincent, B., Fernández-Barbero, A., Microscopic signature of a microgel volume phase transition (2005) Macromolecules, 38, pp. 10782-10787Sabadini, E., Egídio, F.C., Fujiwara, F.Y., Use of water spin-spin relaxation rate to probe the solvation of cyclodextrin (2008) J. Phys. Chem. B, 112, pp. 3328-3332Travelet, C., Schlatter Hébraud, P., Brochon, C., Lapp, A., Hadziioannou, G., Formation and self-organization kinetics of α-CD/PEO-based pseudopolyrotaxanes in water. A specific behavior at 30 C (2009) Langmuir, 25, pp. 8723-874
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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