1,721,040 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
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
Discrete trinuclear copper(II) compounds as building blocks: the influence of the peripheral substituents on the magnetic coupling in oxamato-bridged complexes
No full textCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE MINAS GERAIS - FAPEMIGTwo new trinuclear copper(ii) complexes without end-capping ligands, (Bu4N)2[Cu(dmso)2{Cu(dnopba)(dmso)}2] (1) and (Bu4N)2[Cu(dmso)2{Cu(dcopba)(dmso)}2] (2) [dnopba = 4,5-dinitro-ortho-phenylenebis(oxamate), dcopba = 4,5-dichloro-ortho-phenylenebis(oxamate), Bu4N+ = tetra-n-butylammonium and dmso = dimethylsulfoxide], were synthesized and their structures were determined by single crystal X-ray diffraction. The crystal structures of 1 and 2 consist of two outer bis(oxamato)(dmso)cuprate(ii) units which act as bidentate ligands toward a trans-bis(dmso)copper(ii) inner entity leading to centrosymmetric tricopper(ii) complexes with copper-copper separations across the oxamate bridges of 5.1916(3) (1) and 5.1776(3) Å (2). The peripheral copper(ii) ions in 1 and 2 are five-coordinate in somewhat distorted square pyramidal environments with a dmso molecule filling the apical position whereas the inner copper(ii) ion is six-coordinate in an elongated octahedral environment with two dmso molecules in the axial sites. The investigation of their magnetic properties in the temperature range 2.0-300 K shows the occurrence of a strong intramolecular antiferromagnetic coupling between the copper(ii) ions through the oxamate bridges [J1 = -296(1) (1) and -334(1) cm-1 (2), the Hamiltonian being defined as H = -J1(SCu2·SCu1 + SCu2·SCu1′)], which leads to a low-lying spin doublet at low temperatures. Density functional theory calculations (DFT) have been used to substantiate these magnetic couplings and also to analyse the influence exerted on these interactions by the type of substituent at the 4,5-positions from the phenylene ring of the bis(oxamate) ligand. This journal isTwo new trinuclear copper(ii) complexes without end-capping ligands, (Bu4N)2[Cu(dmso)2{Cu(dnopba)(dmso)}2] (1) and (Bu4N)2[Cu(dmso)2{Cu(dcopba)(dmso)}2] (2) [dnopba = 4,5-dinitro-ortho-phenylenebis(oxamate), dcopba = 4,5-dichloro-ortho-phenylenebis(oxamate), Bu4N+ = tetra-n-butylammonium and dmso = dimethylsulfoxide], were synthesized and their structures were determined by single crystal X-ray diffraction. The crystal structures of 1 and 2 consist of two outer bis(oxamato)(dmso)cuprate(ii) units which act as bidentate ligands toward a trans-bis(dmso)copper(ii) inner entity leading to centrosymmetric tricopper(ii) complexes with copper-copper separations across the oxamate bridges of 5.1916(3) (1) and 5.1776(3) Å (2). The peripheral copper(ii) ions in 1 and 2 are five-coordinate in somewhat distorted square pyramidal environments with a dmso molecule filling the apical position whereas the inner copper(ii) ion is six-coordinate in an elongated octahedral environment with two dmso molecules in the axial sites. The investigation of their magnetic properties in the temperature range 2.0-300 K shows the occurrence of a strong intramolecular antiferromagnetic coupling between the copper(ii) ions through the oxamate bridges [J1 = -296(1) (1) and -334(1) cm-1 (2), the Hamiltonian being defined as H = -J1(SCu2·SCu1 + SCu2·SCu1′)], which leads to a low-lying spin doublet at low temperatures. Density functional theory calculations (DFT) have been used to substantiate these magnetic couplings and also to analyse the influence exerted on these interactions by the type of substituent at the 4,5-positions from the phenylene ring of the bis(oxamate) ligand.43391458614595CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE MINAS GERAIS - FAPEMIGCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE MINAS GERAIS - FAPEMIGSem informaçãoSem informaçãoSem informaçãoKahn, O., (1996) Magnetism: A Supramolecular Function, , NATO ASi Ser. C, Kluwer, Dordrecht, GermanyWinpenny, R.E.P., (2001) Adv. Inorg. Chem., 52, p. 1Gatteschi, D., Sessoli, R., Villain, J., (2006) Molecular Nanomagnets, , Oxford University Press, UKGruselle, M., Train, C., Boubekeur, P., Gredin, P., Ovanesyan, N., (2006) Coord. Chem. Rev., 250, p. 2491Clemente-León, M., Coronado, E., Martí-Gastaldo, C., Romero, F.M., (2011) Chem. Soc. Rev., 40, p. 473Thompson, L.K., Waldman, O., (2005) Coord. Chem. Rev., 249, p. 2677Marvaud, V., Herrera, J.M., Barilero, T., Tuyèras, F., Garde, R., Scuiller, A., Decroix, C., Desplanches, C., (2003) Monatsh. Chem., 134, p. 149Beltran, L.M.C., Long, J.R., (2005) Acc. Chem. Res., 38, p. 325Decurtins, S., Pellaux, R., Antorrena, G., Palacio, F., (1999) Coord. Chem. Rev., 190-192, p. 841Armentano, D., Mastropietro, T.F., De Munno, G., Rossi, P., Lloret, F., Julve, M., (2008) Inorg. Chem., 47, p. 3772Pardo, E., Train, C., Gontard, G., Boubekeur, K., Fabelo, O., Liu, H., Dkhil, B., Verdaguer, M., (2011) J. Am. Chem. Soc., 133, p. 15328Marinescu, G., Andruh, M., Lloret, F., Julve, M., (2011) Coord. Chem. Rev., 255, p. 161Verdaguer, M., Bleuzen, A., Marvaud, V., Vaissermann, J., Seuleiman, M., Desplanches, C., Scuiller, A., Villain, F., (1999) Coord. Chem. Rev., 190-192, p. 1023Ohba, M., Okawa, H., (2000) Coord. Chem. Rev., 198, p. 313Lescouëzec, R., Toma, L.M., Vaissermann, J., Verdaguer, M., Delgado, F.S., Ruiz-Pérez, C., Lloret, F., Julve, M., (2005) Coord. Chem. Rev., 249, p. 2691Tanase, S., Reedijk, J., (2006) Coord. Chem. Rev., 250, p. 2501Kahn, O., (1987) Struct. Bonding, 68, p. 89Stumpf, H.O., Ouahab, L., Pei, Y., Grandjean, D., Kahn, O., (1993) Science, 261, p. 447Kahn, O., Stumpf, H., Pei, Y., Sletten, J., (1993) Mol. Cryst. Liq. Cryst., 233, p. 231Stumpf, H.O., Pei, Y., Kahn, O., Renard, J.P., (1993) J. Am. Chem. Soc., 115, p. 6738Costa, R., García, A., Ribas, J., Mallah, T., Journaux, Y., Sletten, J., Solans, X., (1993) Inorg. Chem., 32, p. 3733Tercero, J., Díaz, C., Ribas, J., Mahia, J., Maestro, M.A., (2002) Inorg. Chem., 41, p. 5373Pardo, E., Ruiz-García, R., Cano, J., Ottenwaelder, X., Lescouëzec, R., Journaux, Y., Lloret, F., Julve, M., (2008) Dalton Trans., p. 2780Dul, M.C., Pardo, E., Lescouëzec, R., Journaux, Y., Ferrando-Soria, J., Ruiz-García, R., Cano, J., Ruiz-Pérez, C., (2010) Coord. Chem. Rev., 254, p. 2281Julve, M., Verdaguer, M., Charlot, M.F., Kahn, O., (1984) Inorg. Chim. Acta, 82, p. 5Hauser, J., Bonin, M., Hursthouse, M.B., Price, D., Decurtins, S., (2010) Dalton Trans., 39, p. 4937Rodríguez-Fortea, A., Alemany, P., Alvarez, S., Ruiz, E., Scuiller, A., Decroix, C., Marvaud, V., Julve, M., (2001) Inorg. Chem., 40, p. 5868Pardo, E., Verdaguer, M., Herson, P., Rousselière, H., Cano, J., Julve, M., Lloret, F., Lescouëzec, R., (2011) Inorg. Chem., 50, p. 6250Verdaguer, M., Kahn, O., Julve, M., Gleizes, A., (1985) Nouv. J. Chim., 9, p. 325Cano, J., Alemany, P., Lloret, F., Alvarez, S., (1999) J. Chem. Soc., Dalton Trans., p. 1669Fortea, F.R., Vallejo, J., Julve, M., Lloret, F., De Munno, G., Armentano, D., Pardo, E., (2013) Inorg. Chem., 52, p. 4777Vallejo, J., Pascual-Alvarez, A., Cano, J., Castro, I., Julve, M., Lloret, F., Krzystek, J., Pardo, E., (2013) Angew. Chem., Int. Ed., 52, p. 14075Pardo, E., Morales-Osorio, I., Julve, M., Lloret, F., Cano, J., Ruiz-García, R., Pasán, J., Journaux, Y., (2004) Inorg. Chem., 43, p. 1873Pardo, E., Train, C., Lescouëzec, R., Journaux, Y., Pasán, J., Ruiz-Pérez, C., Delgado, F.S., Paulsen, C., (2010) Chem. Commun., 46, p. 2322Grancha, T., Tourbillon, C., Ferrando-Soria, J., Julve, M., Lloret, F., Pasán, J., Ruiz-Pérez, C., Pardo, E., (2013) CrystEngComm, 15, p. 9312Castellano, M., Ruiz-García, M., Cano, J., Julve, M., Lloret, F., Journaux, Y., De Munno, G., Armentano, D., (2013) Chem. Commun., 49, p. 3534Ferrando-Soria, J., Castellano, M., Ruiz-García, R., Cano, J., Julve, M., Lloret, F., Ruiz-Pérez, C., Pardo, E., (2013) Chem.-Eur. J., 19, p. 12124Castellano, M., Ferrando-Soria, J., Pardo, E., Julve, M., Lloret, F., Mathonière, C., Pasán, J., Cano, J., (2011) Chem. Commun., 47, p. 11035Castellano, M., Fortea-Pérez, F.R., Stiriba, S.E., Julve, M., Lloret, F., Armentano, D., De Munno, G., Cano, J., (2011) Inorg. Chem., 50, p. 11279Castellano, M., Fortea-Pérez, F.R., Bentama, A., Stiriba, S.E., Julve, M., Lloret, F., De Munno, G., Cano, J., (2013) Inorg. Chem., 52, p. 7645Ferrando-Soria, F., Khajavi, H., Serra-Crespo, P., Gascon, J., Kaptjein, F., Julve, M., Lloret, F., Pardo, E., (2013) Adv. Mater., 24, p. 5625Ferrando-Soria, J., Serra-Crespo, P., De Lange, M., Gascon, J., Kapteijn, F., Julve, M., Cano, J., Pardo, E., (2012) J. Am. Chem. Soc., 134, p. 15301Do Pim, W.D., Oliveira, W.X.C., Ribeiro, M.A., De Faria, E.N., Teixeira, I.F., Stumpf, H.O., Lago, R.M., Julve, M., (2013) Chem. Commun., 49, p. 10778Grancha, T., Ferrando-Soria, J., Cano, J., Lloret, F., Julve, M., De Munno, G., Armentano, D., Pardo, E., (2013) Chem. Commun., 49, p. 5942Fortea-Pérez, F.R., Schlegel, I., Julve, M., Armentano, D., De Munno, G., Stiriba, S.E., (2013) J. Organomet. Chem., 743, p. 102Stumpf, H.O., Pei, Y., Ouahab, L., Le Berre, F., Codjovi, E., Kahn, O., (1993) Inorg. Chem., 32, p. 5687Neels, A., Stoeckli-Evans, H., Chavan, S.A., Yakhmi, J.V., (2001) Inorg. Chim. Acta, 326, p. 106Cangussu, D., Nunes, W.C., Pereira, C.L.M., Pedroso, E.F., Mazali, I.O., Knobel, M., Alves, O.L., Stumpf, H.O., (2008) Eur. J. Inorg. Chem., 24, p. 3802Oliveira, W.X.C., Ribeiro, M.A., Pinheiro, C.B., Nunes, W.N., Julve, M., Journaux, Y., Stumpf, H.O., Pereira, C.L.M., (2012) Eur. J. Inorg. Chem., 34, p. 5685Cador, O., Price, D., Larionova, J., Mathonière, C., Kahn, O., Yakhmi, J.V., (1997) J. Mater. Chem., 7, p. 1263Cador, O., Vaz, M.G.F., Stumpf, H.O., Mathonière, C., Kahn, O., (2001) Synth. Met., 122, p. 559Simões, T.R.G., Mambrini, R.V., Reis, D.O., Marinho, M.V., Ribeiro, M.A., Pinheiro, C.B., Ferrando-Soria, J., Julve, M., (2013) Dalton Trans., 42, p. 5778Pedroso, E.F., Pereira, C.L.M., Dos Santos, H.F., De Oliveira, L.F.C., Nunes, W., Knobel, M., Stumpf, H.O., (2008) J. Magn. Magn. Mater., 320, p. 200Pereira, C.L.M., Pedroso, E.F., Doriguetto, A.C., Ellena, J., Boubekeur, K., Filali, Y., Journaux, Y., Stumpf, H.O., (2011) Dalton Trans., 40, p. 746Fettouhi, M., Ouahab, L., Boukhari, A., Cador, O., Mathonière, C., Kahn, O., (1996) Inorg. Chem., 35, p. 4932Rüffer, T., Bräuer, B., Meva, F.E., Walfort, W., (2008) Dalton Trans., p. 5089Becke, A., (1993) J. Chem. Phys., 98, p. 5648Lee, C., Yang, W., Parr, R., (1988) Phys. Rev. B: Condens. Matter, 37, p. 785Schafer, A., Horn, H., Ahlrichs, R., (1992) J. Chem. Phys., 97, p. 2571Schafer, A., Huber, C., Ahlrichs, R., (1994) J. Chem. Phys., 100, p. 5829Ruiz, E., Cano, J., Alvarez, S., Alemany, P., (1999) J. Comput. Chem., 20, p. 1391Ruiz, E., Rodríguez-Fortea, A., Cano, J., Alvarez, S., Alemany, P., (2003) J. Comput. Chem., 24, p. 982Ruiz, E., Llunell, M., Cano, J., Rabu, P., Drillon, M., Massobrio, C., (2006) J. Phys. Chem. B, 110, p. 115Tomasi, J., Mennucci, B., Cammi, R., (2005) Chem. Rev., 105, p. 2999(2011) Agilent Technologies: CrysAlisPro Software System, , Xcalibur Ccd System Agilent Technologies UK Ltd, Oxford(1999) COLLECT, , Nonius Nonius BV, Delft, The NetherlandsOtwinowski, Z., Minor, W., (1997) Methods in Enzymology, Macromolecular Crystallography, Part A, 276, pp. 307-326. , ed. C. W. Carter Jr. and R. M. Sweet, Academic Press, New YorkPalatinus, L., Chapuis, G., (2007) J. Appl. Crystallogr., 40, p. 786Altomare, A., Cascarano, G., Giacovazzo, C., Guagliardi, A., (1994) J. Appl. Crystallogr., 27, p. 435Sheldrick, G., (2008) Acta Crystallogr., Sect. A: Fundam. Crystallogr., 64, p. 112Farrugia, L.J., (1997) J. Appl. Crystallogr., 30, p. 565Macrae, C.F., Bruno, I.J., Chisholm, J.A., Edgington, P.R., McCabe, P., Pidcock, E., Rodríguez-Monge, L., Wood, P.A., (2008) J. Appl. Crystallogr., 41, p. 466Addison, A.W., Rao, T.N., Reedijk, J., Van Rijn, J., Verschoor, G.C., (1984) J. Chem. Soc., Dalton Trans., p. 1349Tercero, J., Díaz, C., Ribas, J., Mahía, J., Maestro, M., Solans, X., (2002) J. Chem. Soc., Dalton Trans., p. 2040Rüffer, T., Bräuer, B., Meva, F.E., Walfort, B., Salvan, G., Powell, A.K., Hewitt, I.J., Caneschi, A., (2007) Inorg. Chim. Acta, 360, p. 3777Dey, S., Sarkar, S., Mondal, B., Zangrando, E., Sutter, J.P., Chattopadhyay, P., (2011) Inorg. Chim. Acta, 376, p. 129Journaux, Y., Sletten, J., Kahn, O., (1986) Inorg. Chem., 25, p. 439Hammett, L.P., (1935) Chem. Rev., 17, p. 125Hammett, L.P., (1937) J. Am. Chem. Soc., 59, p. 96Takahata, Y., Chong, D.P., (2005) Int. J. Quantum Chem., 103, p. 509Hay, P.J., Thibeault, J.C., Hoffmann, R., (1975) J. Am. Chem. Soc., 97, p. 4884This work was supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG), MICINN (Spain) (Project CTQ-2013-44844P) and the Brazilian-Spanish Project HB2012-0290. The authors express sincere thanks to LabCri-UFMG and IFSC-USP for the X-ray facilities, Prof. Dr M. A. Novak from Universidade Federal do Rio de Janeiro for the use of SQUID magnetometer and Prof. Dr Javier Ellena from Universidade de São Paulo, São Carlos, for single crystal X-ray diffraction measurements. We are so grateful to Dr Y. Journaux (Université Pierre et Marie Curie) and Dr R. Ruiz-García (Universitat de Valencia) for fruitful discussions
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
Synthesis, Crystal Structure, Magnetic Properties, Thermodynamic and Electrochemical Studies of the Binuclear Complex[(Oxalato)bis(1,4,8,11-tetraazacyclotetradecane)-Nickel(II))] Nitrate
No full textMagnetic Properties of a New Hexahalorhenate(IV) Compound and Structural Comparison with Its Hexahaloplatinate(IV) Analog
No full textTwo mononuclear complexes of formula (Et3BzN)2[ReCl6] (1) and (Et3BzN)2[PtCl6] (2) (Et3BzN+ = triethylbenzylammonium cation) have been synthesized in good yield (70 and 75 %, respectively) and structurally characterized. From a structural point of view, they both crystallized in the monoclinic centrosymmetric P21/n space group and the two molecular structures are almost perfectly superimposable, with only minor differences in the M–Cl bond lengths. Solid-state direct-current (dc) magnetic susceptibility analysis in the temperature range 1.9–300 K for 1 reveal the occurrence of magnetically isolated rhenium(IV) ions with a significant zero-field splitting (zfs), D = +6.7 cm–1 (2D being the energy gap between the MS = ±3/2 and MS = ±1/2 Kramers doublets). DFT, CASSCF and CASSCF/NEVPT2 theoretical calculations were carried out on the experimental geometry of the complex [ReCl6]2– in 1 to substantiate the parameters defining the zfs tensor. Alternating current (ac) magnetic susceptibility measurements of 1 in the temperature 2.0–10 K show incipient frequency–dependence of the out-of-phase signals below 3.0 K under non-zero applied dc fields supporting a field–dependent Single Ion Single Molecule Magnet (SISMM) behaviour of this rhenium(IV) derivative
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