1,720,958 research outputs found
Characterization Of Si:o:c:h Films Fabricated Using Electron Emission Enhanced Chemical Vapour Deposition
No full textSilicon-based polymers and oxides may be formed when vapours of oxygen-containing organosilicone compounds are exposed to energetic electrons drawn from a hot filament by a bias potential applied to a second electrode in a controlled atmosphere in a vacuum chamber. As little deposition occurs in the absence of the bias potential, electron impact fragmentation is the key mechanism in film fabrication using electron-emission enhanced chemical vapour deposition (EEECVD). The feasibility of depositing amorphous hydrogenated carbon films also containing silicon from plasmas of tetramethylsilane or hexamethyldisiloxane has already been shown. In this work, we report the deposition of diverse films from plasmas of tetraethoxysilane (TEOS)-argon mixtures and the characterization of the materials obtained. The effects of changes in the substrate holder bias (VS) and of the proportion of TEOS in the mixture (XT) on the chemical structure of the films are examined by infrared-reflection absorption spectroscopy (IRRAS) at near-normal and oblique incidence using unpolarised and p-polarised, light, respectively. The latter is particularly useful in detecting vibrational modes not observed when using conventional near-normal incidence. Elemental analyses of the film were carried out by X-ray photoelectron spectroscopy (XPS), which was also useful in complementary structural investigations. In addition, the dependencies of the deposition rate on VS and XT are presented. © 2007 Elsevier B.V. All rights reserved.5165803806Wang, J., de Moraes, M.A.B., Landers, R., Trasferetti, B.C., (2002) Plasmas Polym., 7, p. 227de Moraes, M.A.B., Durrant, S.F., Rouxinol, F.P.M., (2001) Thin Solid Films, 398-399, p. 591Gelamo, R.V., Bica de Moraes, M.A., Trasferetti, B.C., Rouxinol, F.P.M., Davanzo, C.U., (2005) Chem. Mater., 17, p. 5789Greenler, R.G., (1966) J. Chem. Phys., 44, p. 310Berreman, D.W., (1963) Phys. Rev., 130, p. 2193Kirk, C.T., (1988) Phys. Rev., B, 38, p. 1255Jurgens-Kowal, T.A., Rogers, J.W., (1998) J. Phys. Chem., B, 102, p. 2193Wolfe, D.M., Hinds, B.J., Wang, F., Lucovsky, G., Ward, B.L., Xu, M., Nemanich, R.J., Maher, D.M., (1999) J. Vac. Sci. Technol., A, Vac. Surf. Films, 17, p. 2170Smith, A.L., (1977) Applied Infrared Spectroscopy, p. 286. , Wiley, New YorkLucovsky, G., Tsu, D.V., (1987) J. Vac. Sci. Technol., A, Vac. Surf. Films, 5, p. 2231Silverstein, R.M., Bassler, G.C., Morrill, T.C., (1967) Spectrometric Identification of Organic Compounds, , John Wiley, New York (Ch. 3)Pliskin, W.A., (1977) J. Vac. Sci. Technol., 14, p. 1054Nilsen, K., Wautier, H., Danforth, S.C., (1986) Ceramic Powder Science, Advances in Ceramics, 21, p. 537. , Messing G., Mazdiyani K., McCauley J., and Haber R. (Eds), American Ceramic Society, Westerville, OHAlmeida, R.M., Pantano, C.G., (1990) J. Appl. Phys., 68, p. 4225Durrant, S.F., Castro, S.G., Cisneros, J.I., Cruz, N.C., Bica de Moraes, M.A., (1996) J. Vac. Sci. Technol., 14, p. 118Yasuda, H., Marsh, H.C., Bumgarner, O., Morosoff, N., (1975) J. Appl. Polym. Sci., 19, p. 2845Nefedov, V.I., Salyn, Ya.V., Leonhardt, G., Scheibe, R., (1977) J. Electron Spectrosc., 10, p. 121Wagner, C.D., Riggs, W.M., Davis, L.E., Moulder, J.F., (1979) Handbook of X-ray Photoelectron Spectroscopy, pp. 52.f. , Muilenberg G.E. (Ed), Perkin-Elmer Corp, Eden Prairie, MinnesotaWagner, C.D., (1978) J. Vac. Sci. Technol., 15, p. 518Lee, H.J., Yang, C.S., Chi, C.K., (2004) Mat. Sci. Forum, 449, p. 473Mabboux, P.Y., Gleason, K.K., (2005) J. Electrochem. Soc., 152, pp. F7Oh, K.S., Yu, Y.H., Choi, C.K., Lee, K.M., (2006) J. Korean Phys. Soc., 48, p. 168
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
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
Introduction To The Specular Reflection And Reflection-absorption Techniques In The Infrared: (1) Reflection-absorption [às Técnicas De Reflexão Especular E De Reflexão-absorção No Infravermelho: (2) Reflexão-absorção]
No full textThis paper is the second part of an article aimed to present theoretical basis as well as some applications of two infrared reflection techniques: specular reflection and reflection-absorption. It is emphasyzcd how much spectral simulation can aid spectral analysis. The usefulness of reflection-absorption spectroscopy as a thin film caracterization technique is stressed. Optical effects such as LO-TO splittings and their observation as Berreman effect are also addressed.24199104Trasferetti, B.C., Davanzo, C.U., (2001) Quim. Nova, 24, p. 99Swalen, J.D., Allara, D.L., Andrade, J.D., Chandross, E.A., Garoff, S., Israelachvilli, J., McCarthy, T.J., Yu, H., (1987) Langmuir, 3, p. 932Parikh, A.N., Allara, D.L., (1992) J. Chem. Phys., 96, p. 927Golden, W.G., (1985) Fourier Transform Infrared Spectroscopy, 4, p. 315. , Ferraro, J. R., Ed.Academic PressSwalen, J.D., Rabolt, J.F., (1985) Fourier Transform Infrared Spectroscopy, 4, p. 283. , Ferraro, J. R., Ed.Academic PressGrosse, P., (1991) Mikrochim. Acta, 11, p. 309Yamamoto, K., Ishida, H., (1997) Vib. Spectrosc., 15, p. 27Yamamoto, K., Ishida, H., (1994) Vib. Spectrosc., 8, p. 1Wendlandt, W.W., Hecht, H.G., (1966) Reflectance Spectroscopy, , Interscience Publishers, New York, cap. 1Born, M., Wolf, E., (1980) Principles of Optics, Sixth (Corrected) Edition, , Cambridge University Press, CambridgeHuang, K., (1951) Proc. Roy. Soc. A, 208, p. 352Durman, R., Fauvre, P., Jayasooriya, U.A., Kettle, F.A., (1987) J. Cryst. and Spectrosc. Research, 17, p. 431Harbecke, B., Heinz, B., Grosse, P., (1985) Appl. Phys. A, 38, p. 263Berreman, D.W., (1963) Phys. Rev., 132, p. 2193Smith, D.Y., Shiles, E., Inokuti, M., (1985) Handbook of Optical Constants of Solids, p. 369. , Palik, E. D., Ed.Academic Press, Inc.OrlandoAllara, D.L., Swalen, J.D., (1982) J. Phys. Chem., 86, p. 2700Allara, D.L., Swalen, J.D., (1985) Langmuir, 1, p. 52Nuzzo, R.G., Dubois, L.H., Allara, D.L., (1990) J. Am. Chem. Soc., 112, p. 558Touwslager, F.J., Sondag, H.M., (1994) Langmuir, 10, p. 1028Tao, Y.-T., Lin, W.-L., Hietpas, G.D., Allara, D.L., (1997) J. Phys. Chem. B, 101, p. 9732Chollet, P.-A., Messier, J., Rosilio, C., (1976) J. Chem. Phys., 64, p. 1042Rabolt, J.F., Burns, F.C., Schlotter, N.E., Swalen, J.D., (1983) J. Chem. Phys., 78, p. 946Ishino, Y., Ishida, H., (1988) Langmuir, 4, p. 1341Chesters, M.A., Cook, M.J., Gallivan, S.L., Simmons, J.M., Slater, D.A., (1992) Thin Solid Films, 210, p. 538Poynter, R.H., Cook, M.J., Chesters, M.A., Slater, D.A., McMurdo, J., Welford, K., (1994) Thin Solid Films, 243, p. 346Suga, K., Rusling, J.F., (1993) Langmuir, 9, p. 3549Sakata, Y., Domen, K., Onishi, T., (1994) Langmuir, 10, p. 2847Lefez, B., Souchet, R., Kartouni, K., Lenglet, M., (1995) Thin Solid Films, 268, p. 45Guillamet, R., Lenglet, M., Adam, F., (1992) Sol. State. Comm., 81, p. 633Tayeb Anki, M.M., Lefez, B., (1996) Appl. Opt., 35, p. 1399Scherübl, Th., Thomas, L.K., (1997) Appl. Spectrosc., 51, p. 844Scherübl, Th., Thomas, L.K., (1994) Fresenius J. Anal. Chem., 349, p. 216Trasferetti, B.C., Davanzo, C.U., Da Cruz, N.C., De Moraes, M.A.B., (2000) Appl. Spectrosc., 54, p. 687Trasferetti, B.C., Davanzo, C.U., Zoppi, R.A., Dados ainda não publicadosGreenler, R.G., (1966) J. Chem. Phys., 44, p. 310Wong, J.S., Yen, Y.S., (1988) Appl. Spectrosc., 42, p. 598Urai, Y., Ohe, C., Itoh, K., (1998) Langmuir, 14, p. 4559Phillip, H.R., (1979) J. Appl. Phys., 50, p. 1053Porter, M.D., Bright, T.B., Allara, D.L., (1986) Anal. Chem., 58, p. 2461Grosse, P., Harbecke, B., Heinz, B., Meyer, R., (1986) Appl. Phys. A, 39, p. 257Udagawa, A., Matsui, T., Tanaka, S., (1986) Appl. Spectrosc., 40, p. 794Yamamoto, K., Masui, A., (1996) Appl. Spectrosc., 50, p. 759Yen, Y.-S., Wong, J.S., (1989) J. Chem. Phys., 93, p. 720
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
- …
