1,720,972 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Effect Of Plasticizers On A Pvc Sensing Phase For Evaluation Of Water Contamination By Aromatic Hydrocarbons And Fuels Using Infrared Spectroscopy
No full textThe effects of di-2-ethylhexylsebacate (DOS), di-2-ethylhexylphthalate (DOP) and 2-nitro-phenyl-octylether (NPOE) plasticizers on a PVC sensing phase for evaluation of water contamination by aromatic hydrocarbons and fuels were investigated. The performance of each film was assessed by means of figures of merit obtained from analytical curves constructed in different wavenumbers. A mixture design (simplex centroid) with the BTEX compounds was performed in order to evaluate cross-interferences and interaction effects. For preparation of the sensing phase, a mixture of PVC with 25% of the plasticizer and 0.3% of the stabilizer Tinuvin P (2-2′-hydroxy-5-tert-octylphenyl-benzotriazol) dissolved in THF was used. The results show that NPOE and DOP plasticizers present similar performances, while DOS provides better values of sensitivity and detection limit for all compounds. With the use of DOS the detection limits were 2.4, 0.4, 1.5 and 1.2 mg L -1 for BTEX, respectively. Regarding the study of multi-component interactions, it was observed that benzene and xylenes do not show interferences from the other analytes of the mixture at the wavenumbers of 676 and 1522 cm -1, respectively. Ethylbenzene and toluene undergo spectral interferences and interaction effects in all peaks evaluated, requiring a multivariate calibration for their determination. In the analysis of water contaminated by fuels, a 3-D plot as a function of benzene, toluene and xylenes concentrations as well as the principal component analysis of the spectral data presented well-defined groups for each kind of contamination (gasoline A, gasoline C, diesel and diesel with 2% of biodiesel). These results demonstrate the potential of the proposed method, employing a PVC sensing phase, with transmittance measurements in the mid-infrared, for determination of contamination of waters by aromatic hydrocarbons. In conclusion, PVC films plasticized with DOS can be useful for studies of water contamination based on transmittance measurements in the mid-infrared region, avoiding the drawbacks of ATR methods. © 2009 Elsevier B.V. All rights reserved.1391222230Albuquerque, J.S., Pimentel, M.F., Silva, V.L., Raimundo Jr., I.M., Rohwedder, J.J.R., Pasquini, C., Silicone sensing phase for detection of aromatic hydrocarbons in water employing near-infrared spectroscopy (2005) Anal. Chem., 77, pp. 72-77Lima, K.M.G., Raimundo Jr., I.M., Pimentel, M.F., Improving the detection limits of near infrared spectroscopy in the determination of aromatic hydrocarbons in water employing a silicone sensing phase (2007) Sens. Actuators B, 125, pp. 229-233Heglund, D.L., Tilotta, D.C., Determination of volatile organic compounds in water by solid phase microextration and infrared spectroscopy (1996) Environ. Sci. Technol., 30, pp. 1212-1219Jakusch, M., Mizaikoff, B., Kellner, R., Towards a remote IR fiber-optic sensor system for the determination of chlorinated hydrocarbons in water (1997) Sens. Actuators B, 83, pp. 38-39Yang, J., Ramesh, A., Membrane-introduced infrared spectroscopic chemical sensing method for the detection of volatile organic compounds in aqueous solutions (2005) Analyst, 130, pp. 397-403Flavin, K., Hughes, H., Dobbyn, V., Kirwan, P., Murphy, K., Steiners, H., Mizaikoff, B., Mcloughlin, P., A comparison of polymeric materials as pre-concentrating media for use with ATR/FTIR sensing (2006) Int. J. Environ. Anal. Chem., 86 (6), pp. 401-415Gobel, R., Krska, R., Kellner, R., Seitz, R.W., Tomellini, S.A., Investigation of different polymers as coating materials for IR/ATR spectroscopic trace analysis of chlorinated hydrocarbons in water (1994) Appl. Spectrosc., 48, pp. 678-683Janotta, M., Karlowatz, M., Vogt, F., Mizaikoff, B., Sol-gel based mid-infrared evanescent wave sensors for detection of organophosphate pesticides in aqueous solution (2003) Anal. Chim. Acta, 496, pp. 339-348Eartan-Lamontagne, M.C., Lowry, S.R., Seitz, W.R., Tomellini, S.A., Polymer-coated tapered cylindrical ATR elements for sensitive detection of organic solutes in water (1995) Appl. Spectrosc., 49 (8), pp. 1170-1173Walsh, J.E., Maccraith, B.D., Meaney, M., Vos, J.G., Regan, F., Lancia, A., Artjushenko, S., Sensing of chlorinated hydrocarbons and pesticides in water using polymer coated mid-infrared optical fibres (1996) Analyst, 121, pp. 789-792Regan, F., Walsh, F., Walsh, J., Development of plasticised PVC sensing films for the determination of BTEX compounds in aqueous samples (2003) Int. J. Environ. Anal. Chem., 83, pp. 621-631McCue, R.P., Walsh, J.E., Walsh, F., Regan, F., Modular fibre optic sensor for the detection of hydrocarbons in water (2006) Sens. Actuators B, 114, pp. 438-444Silva, A.M.S., Pimentel, M.F., Raimundo Jr., I.M., Almeida, Y.M.B., A PVC sensing for determination of BTEX in water employing mid-infrared spectroscopy (2008) Vib. Spectrosc., 46, pp. 39-44Titow, W.V., (1984) PVC Technology. 4th ed., , Elsevier Applied Science, OxfordGäther, R., Müller, H., (1984) Plastic Additives Handbook. 2nd ed., , Hanser, New YorkRabello, M., (2000) Aditivação de Polímeros, , Ed. Artiliber, São PauloNeto, B.B., Scarminio, I.S., Bruns, R.E., Fazer Experimentos, C., (2003) Pesquisa e Desenvolvimento na Ciência e na Indústria, , 2a ed, Ed. Unicamp, Campinas, São PauloCornell, J.A., (1990) Experiments with Mixtures: Designs Models and the Analysis of Mixtures Data, , Wiley, New YorkScheffé, H., Simplex-centroid design for experiments with mixtures (1963) J. Roy. Stat. Soc. B, 25, pp. 235-263Coscione, A.R., de Andrade, J.C., May, G.M., O modelamento estatístico de misturas: experimento tutorial usando voltametria de redissolução anódica (2005) Quim. Nova, 28 (6), pp. 1116-1122Reis, C., de Andrade, J.C., Planejamento experimental para misturas usando cromatografia em papel (1996) Quim. Nova, 19 (3), pp. 313-319Rocha, G.B., Freire, R.O., Simas, A.M., Stewart, J.J.P., RM1: A reparameterization of AM1 for H, C, N, O, P, S, F, Cl, Br, and I (2006) J. Comput. Chem., 27, pp. 1101-1111Armstrong, R.D., Covington, A.K., Proud, W.G., Solvent properties of PVC membranes (1988) J. Electroanal. Chem., 257, pp. 155-169Armstrong, R.D., Todd, M., The role of PVC in ion selective electrode membranes (1987) J. Electroanal. Chem., 237, pp. 181-185Armstrong, R.D., Wang, H., Todd, M., Solvent properties of PVC membranes (1989) J. Electroanal. Chem., 266, pp. 173-17
Variations on the Author
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Near And Mid Infrared Optical Sensors [sensores ópticos Com Detecção No Infravermelho Próximo E Médio]
No full textOptical chemical sensors with detection in the near and mid infrared region are reviewed. Fundamental concepts of infrared spectroscopy and optical chemical sensors are briefly described, before presenting some aspects on optical chemical sensors, such as synthesis of NIR and IR reagents, preparation of new materials as well as application in determinations of species of biological, industrial and environmental importance.32616351643Kautsky, H., Hirsch, A., (1931) Berichte der Deutschen Chemischen Gesellschaft, 64, p. 2677Bergman, I., (1968) Nature, 218, p. 266Lubbers, D.W., Opitz, N., (1975) Z. Naturforsch., 30 C, p. 532Wolfbeis, O.S., (2008) Anal. Chem., 80, p. 4269Wolfbeis, O.S., (1991) Fiber Optic Chemical Sensors and Biosensors, 1-2. , CRC Press: Boca RatonPasquini, C., (2003) J. Braz. Chem. Soc., 14, p. 198Skoog, D.A., Holler, F.J., Crouch, S.R., (2007) Principles of Instrumental Analysis 6th ed, , Thomson Brooks: USAHerschel, W., (1800) Phil Trans. Roy. Soc. London, PART II, p. 255Herschel, W., (1800) Phil Trans. Roy. Soc. London, PART II, p. 284Jerome, J., Workman, J.R., (1996) Appl. Spectrosc. Rev., 31, p. 251Bums, D.A., Ciurczak, E.W., (2001) Handbook of Near-Infrared Analysis, 2nd Ed., , Marcel Dekker: New YorkKhezri, B., Amini, M.K., Firooz, A.R., (2008) Anal. Bioanal. Chem., 390, p. 1943Jeronimo, P.C.A., Araujo, A.N., Montenegro, M.C.B.S.M., (2007) Talanta, 72, p. 13Ng, S.M., Narayanaswamy, R., (2006) Anal. Bioanal. Chem., 386, p. 1235Newcombe, D.T., Cardwell, T.J., Cattrall, R.W., Kolev, S.D., (1999) Anal. Chim. Acta, 395, p. 27Norris, J., (1989) Analyst, 114, p. 1359Gupta, V.K., Chandra, S., Mangla, R., (2002) Eletrochim. Acta, 47, p. 1519Skibsted, E., Lindemann, C., Roca, C., Olsson, L., (2001) J. Biotechnol., 88, p. 47Taib, M.N., Narayanaswamy, R., (1995) Analyst, 120, p. 1617Cao, W., Duan, Y., (2006) Sens. Actuators, B, 119, p. 363Janata, J., (1990) Principles of Chemical Sensors, , Plenum Press: New YorkSpichiger-Keller, U.E., (1998) Chemical Sensors and Biosensors for Medical and Biological Applications, , Wiley-VCH: WeinheimMcDonagh, C., Burke, C.S., MacCraith, B.D., (2008) Chem. Rev., 108, p. 400Citterio, D., Kawada, T., Yagi, J., Ishigaki, T., Hisamoto, H., Sasaki, S.-I., Suzuki, K., (2003) Anal. Chim. Acta, 482, p. 19Citterio, D., Rásonyi, S., Spichiger, U.E., (1996) Fresenius' J. Anal. Chem., 354, p. 836Citterio, D., Jenny, L., Rásonyi, S., Spichiger, U.E., (1997) Sens. Actuators, B, 38-39, p. 202Czerney, P., Grummt, U.-W., (1997) Sens. Actuators, B, 38-39, p. 395Puyol, M., Encinas, C., Rivera, L., Miltsov, S., Alonso, J., (2007) Sens. Actuators, B, 122, p. 53Puyol, M., Encinas, C., Rivera, L., Miltsov, S., Alonso, J., (2007) Dyes Pigm., 73, p. 383Zhu, X., Fu, S., Wong, W.-K., Wong, W.-Y., (2008) Tetrahedron Lett., 49, p. 1843Zhu, X.-J., Fu, S.-T., Wong, W.-K., Guo, J.-P., Wong, W.-Y., (2006) Angew. Chem., Int. Ed., 45, p. 3150Coskum, A., Yilmaz, M.D., Akkaya, E.U., (2007) Org. Lett., 9, p. 607Zhu, M., Yuan, M., Liu, X., Xu, J., Lv, J., Huang, C., Liu, H., Zhu, D., (2008) Org. Lett., 10, p. 1481Tang, Bo., Huang, H., Xu, K., Tong, L., Yang, G., Liu, X., An, L., (2006) Chem. Commun., 34, p. 3609Basheer, M.C., Alex, S., Thomas, K.G., Suresh, C.H., Das, S., (2006) Tetraedron, 62, p. 605Fabian, J., (1992) Chem. Rev., 92, p. 1197Lu, Y., Han, L., Brinker, C.J., Niemczyk, T.M., Lopez, G.P., (1996) Sens. Actuators, B, 35-36, p. 517Janotta, M., Karlowatz, M., Vogt, F., Mizaikoff, B., (2003) Anal. Chim. Acta, 496, p. 339Flavin, K., Mullowney, J., Murphy, B., Owens, E., Kirwan, P., Murphy, K., Hughes, H., McLoughlin, P., (2001) Analyst, 132, p. 224Barone, P.W., Baik, S., Heller, D.A., Strano, M.S., (2005) Nat. Mater., 4, p. 86Barone, P.W., Parker, R.S., Strano, M.S., (2005) Anal. Chem., 77, p. 1556Jakusch, M., Janotta, M., Mizaikoff, B., (1999) Anal. Chem., 71, p. 4786Gong, S.L., Yu, Z.J., Meng, L.Z., Hu, L., He, Y.B., (2004) J. Appl. Polym. Sci., 93, p. 637Airoudj, A., Debarnot, D., Bêche, B., Poncin-Epaillard, F., (2008) Talanta, 76, p. 314Yang, J., Liang, S.C., (2005) Anal. Chim. Acta, 537, p. 385Huang, G.G., Yang, J., (2005) Biosens. Bioelectron., 21, p. 408Lee, C.J., Yang, J., (2006) Anal. Biochem., 359, p. 124Lin, H.C., Chou, Y.H., Yang, J., (2008) Anal. Chim. Acta, 606, p. 230Wei, Y.K., Yang, J., (2007) Talanta, 71, p. 2007Lee, C.J., Yang, J., (2008) Talanta, 74, p. 1104Keirsse, J., Boussard-Plédel, C., Loréal, O., Sire, O., Bureau, B., Leroyer, P., Turlin, B., Lucas, J., (2003) Vib. Spectrosc., 32, p. 23Acha, V., Meurens, M., Naveau, H., Agathos, S.N., (2000) Biotechnol. Bioeng., 68, p. 437Lucena, R., Cárdenas, S., Gallego, M., Valcárcel, M., (2006) Analyst, 131, p. 415Bentrup, U., Küpper, L., Budde, U., Lovis, K., Jähnisch, K., (2006) Chem. Eng. Technol., 29, p. 1216Roychoudhury, P., Harvey, L.M., McNeil, B., (2006) Anal Chim. Acta, 571, p. 159Vojinovic, V., Cabral, J.M.S., Fonseca, L.P., (2006) Sens. Actuators, B, 114, p. 1083Buerck, J., Roth, S., Kraemer, K., Mathieu, H., (2003) J. Hazard. Mater., 102, p. 13Göbel, R., Krska, R., Kellner, R., Seitz, R.W., Tomellini, S.A., (1994) Appl. Spectrosc., 6, p. 678Göbel, R., Seitz, R.W., Tomellini, S.A., Krska, R., Kellner, R., (1995) Vib. Spectrosc., 8, p. 141Flavin, K., Hughes, H., Dobbyn, V., Kirwan, P., Murphy, K., Steiner, H., Mizaikoff, B., McLoughlin, P., (2006) Int. J. Environ. Anal. Chem., 86, p. 401Flavin, K., Hughes, H., McLoughlin, P., (2007) Int. J. Environ. Anal. Chem., 87, p. 29Murphy, B., Kirwan, P., McLoughlin, P., (2003) Anal. Bional. Chem., 377, p. 195Murphy, B., Kirwan, P., McLoughlin, P., (2003) Vib. Spectrosc., 33, p. 75Regan, F., Walsh, F., Walsh, J., (2003) Int. J. Environ. Anal. Chem., 83, p. 621Regan, F., MacCraith, B.D., Walsh, J.E., O'Dwyer, K., Vos, J.G., Meaney, M., (1997) Vib. Spectrosc., 14, p. 239Walsh, J.E., MacCraith, B.D., Meaney, M., Vos, J.G., Regan, F., Lancia, A., Artjushenko, S., (1996) Analyst, 121, p. 789McCue, R.P., Walsh, J.E., Walsh, F., Regan, F., (2006) Sens. Actuators, B, 114, p. 438Kraft, M., Jakusch, M., Karlowatz, M., Katzir, A., Mizaikoff, B., (2003) Appl. Spectrosc., 6, p. 591Janotta, M., Katzir, A., Mizaikoff, B., (2003) Appl. Spectrosc., 7, p. 823Heglund, D.L., Tilotta, D.C., (1996) Environ. Sci. Technol., 30, p. 1212Merchman, S.A., Lubbad, S.H., Tilotta, D.C., (1998) J. Chromatogr., A, 829, p. 311Silva, A.M.S., Pimentel, M.F., Raimundo Jr., I.M., Almeida, Y.M.B., (2008) Vib. Spectrosc., 46, p. 39Degrandpre, M.D., Burgess, L.W., (1990) Appl. Spectrosc., 44, p. 273Tobiska, P., Chômât, M., Matejec, V., Berková, D., Hüttel, I., (1998) Sens. Actuators, B, 51, p. 152Bürck, J., Conzen, J.P., Ache, H.J., (1992) Fresenius'J. Anal. Chem., 342, p. 394Conzen, J.P., Bürck, J., Ache, H.J., (1993) Appl. Spectrosc., 47, p. 753Conzen, J.P., Bürck, J., Ache, H.J., (1994) Fresenius'J. Anal. Chem., 348, p. 501Bürck, J., Conzen, J.P., Beckhaus, B., Ache, H.J., (1994) Sens. Actuators, B, 18-19, p. 291Buerck, J., Roth, S., Kraemer, K., Scholz, M., Klaas, N., (2001) J. Hazard Mater., 83, p. 11Mayer, J., Bürck, J., Ache, H.J., (1996) Fresenius J. Anal. Chem., 354, p. 841Zimmermann, B., Bürck, J., Ache, H.J., (1997) Sens. Actuators, B, 41, p. 45Chômât, M., Berkova, D., Matejec, V., Kasik, I., Kuncova, G., Hayer, M., (2002) Sens. Actuators, B, 87, p. 258Skokankova, J., Mrazek, J., Matejec, V., Hayer, M., Kasik, I., Chômât, M., Berkova, D., Raileanu, M., (2006) Mater. Sci. Eng., C, 26, p. 208Blair, D.S., (1997) Anal. Chem., 69, p. 2238Santoyo, A.T., Shlyagin, M.G., Jimenez, F.J.M., Oyarzabal, L.N.R., (2007) Opt. Commun., 271, p. 386Albuquerque, J.S., Pimentel, M.F., Silva, V.L., Raimundo Jr., I.M., Rohwedder, J.J.R., Pasquini, C., (2005) Anal. Chem., 77, p. 72Lima, K.M.G., Raimundo Jr., I.M., Pimentel, M.F., (2007) Sens. Actuators, B, 125, p. 22
- …
