1,720,982 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
Micro- Reactors For Testing Sensor Devices Based On Suspended Carbon Nanotubes
No full textIn this work, we report the fabrication of micro-reactors for the characterization of nano-sensors based on suspended nanoparticle-decorated carbon nanotubes (CNTs/NPs). The capsules were fabricated from a single Kovar® piece, having a small volume chamber (100μl). Gold thin films were sputtered onto Si/SiO2 substrates and the electrodes were patterned using electrochemical deposition, photolithography and wet chemical corrosion. In order to obtain devices based on suspended nanotubes, prior to CNTs deposition, a 1μm wide and 5μm deep gap was milled in the substrate by focused ion beam (FIB). The dielectrophoresis (DEP) technique was used for the deposition of the suspended CNTs over the as obtained patterned electrodes. The sensors were tested using oxygen and nitrogen atmospheres, in the pressure range between 10-5 and 10-1mbar. The small chamber volume allowed the measurement of fast sensor characteristic times, with the sensors showing good sensitivity towards gas and pressure as well as high reproducibility. © The Electrochemical Society.491191197Pan, C., Zhu, J., (2009) J. Mater. Chem., 19, p. 869Rao, C.N.R., Deepak, F.L., Gundiah, G., Govindaraj, A., (2003) Prog. Solid State Chem., 31, p. 5Kuchibhatla, S.V.N.T., Karakoti, A.S., Bera, D., Seal, S., (2007) Prog. Mater Sci., 52, p. 699Fang, X., Bando, Y., Liao, M., Gautam, U.K., Zhi, C., Dierre, B., Liu, B., Golberg, D., (2009) Adv. Mater., 21, p. 2034Velamakanni, A., Ganesh, K.J., Zhu, Y., Ferreira, P.J., Ruoff, R.S., (2009) Adv. Funct. Mater., 19, p. 3926Kolmakov, A., Moskovits, M., (2004) Annu. Rev. Mater. Res., 34, p. 151Chen, Y.Q., Jiang, J., Wang, B., Hou, J.G., (2004) J. Phys. D: Appl. Phys., 37, p. 3319Savu, R., Joanni, E., (2006) Scr. Mater., 55, p. 979Cheng, K.W., Lin, Y.T., Chen, C.Y., Hsiung, C.P., Gan, J.Y., Yeh, J.W., Hsieh, C.H., Chou, L.J., (2006) Appl. Phys. Lett., 88, p. 043115Cao, B., Cai, W., (2008) J. Phys. Chem. C, 112, p. 680Yoshimura, M., Byrappa, K., (2008) J. Mater. Sci., 43, p. 2085Moshkalev, S.A., Verissimo, C., (2007) J. Appl. Phys., 102, p. 044303Valcarcel, M., Simonet, B.M., Cardenas, S., Suarez, B., (2005) Anal. Bioanal. Chem., 382, p. 1783Brahim, S., Colbern, S., Gump, R., Moser, A., Grigorian, L., (2009) Nanotechnology, 20, p. 235502Gelamo, R.V., Rouxinol, F.P., Verissimo, C., Vaz, A.R., De Moraes, M.A.B., Moshkalev, S.A., (2009) Chem. Phys. Lett., 482, p. 302Van Leeuwen, M., Heijnen, J.J., Gardeniers, H., Oudshoorn, A., Noorman, H., Visser, J., Van Der Wielen, L.A.M., Van Gulik, W.M., (2009) Chem. Eng. Sci., 64, p. 455Iijima, S., (1991) Nature, 354, p. 56Shin, W.C., Besser, R.S., (2006) J. Micromech. Microeng., 16, p. 731Shen, G., Chen, P.C., Ryu, K., Zhou, C., (2009) J. Mater. Chem., 19, p. 828Comini, E., Baratto, C., Faglia, G., Ferroni, M., Vomiero, A., Sberveglieri, G., (2009) Prog. Mater Sci., 54, p. 1Goldoni, A., Petaccia, L., Lizzit, S., Larciprete, R., (2010) J. Phys.: Condens. Matter., 22, p. 013001Abgrall, P., Nguyen, N.T., (2008) Anal. Chem., 80, p. 2326Dai, L., Soundarrajan, P., Kim, T., (2002) Pure Appl. Chem., 74, p. 1753Tiggelaar, R.M., Van Male, P., Berenschot, J.W., Gardeniers, J.G.E., Oosterbroek, R.E., De Croon, M.H.J.M., Schouten, J.C., Elwenspoek, M.C., (2005) Sens. Actuators, A, 119, p. 196Leon, J., Flacker, A., Vaz, A.R., Verissimo, C., Moraes, M.B., Moshkalev, S.A., (2010) J. Nanosci. Nanotechnol., 10, p. 6234Gelamo, R.V., Rouxinol, F.P., Verissimo, C., Vaz, A.R., De Moraes, M.A.B., Moshkalev, S.A., (2009) Chem. Phys. Lett., 482, p. 306Gelamo, R.V., Rouxinol, F.P., Verissimo, C., De Moraes, M.A.B., Moshkalev, S.A., (2010) Sens. Lett., 8, p. 48
Formation Of Reliable Electrical And Thermal Contacts Between Graphene And Metal Electrodes By Laser Annealing
No full textA new approach for electrical and thermal improvement of contacts between carbon nanostructures (multi-wall carbon nanotubes - MWCNTs and multi-layer graphene - MLG) and metal electrodes by localized laser heating is presented. The nanostructures were deposited over electrodes using the dielectrophoresis (DEP) technique. A focused laser beam was used for direct heating the samples in ambient atmosphere. The Raman spectroscopy was used to determine the process temperature by observations of the graphitic G-line downshift. In the laser annealing experiments, the G-line position was found first to downshift linearly with laser power indicating gradual heating of the sample proportional to the absorbed power. However, with increasing power the shift was found to saturate at levels that depend on the metal and the contact area. This saturation was attributed to gradual increase of the contact area and improvement of the thermal contacts between the nanostructures and metal electrode that can occur during sample heating. The maximum sample temperature in the beginning of the annealing process was always higher for MLG samples, due to smaller area of contact established between rigid multi-layer graphene and initially rough metal surface. The final result is the increased heat losses to the electrodes and, subsequently, the reduction of the samples temperature. The main advantage of this method, when compared with traditional and rapid thermal annealing, is that the thermal treatment is localized in a small pre-determined region, allowing individually controlled annealing process. © 2014 Elsevier B.V. All rights reserved.1215558Léonard, F., Talin, A.A., (2011) Nat. Nanotechnol., 6, pp. 773-783Robinson, J.A., Labella, M., Zhu, M., Hollander, M., Kasarda, R., Hughes, Z., Trumbull, K., Snyder, D., (2011) Appl. Phys. Lett., 98, pp. 0531031-0531033Xia, F., Perebeinos, V., Lin, Y.-M., Wu, Y., Avouris, P., (2011) Nat. Nanotechnol., 6, pp. 179-184Knoch, J., Chen, Z., Appenzeller, J., (2012) IEEE Trans. Nanotechnol., 11, pp. 513-519Krupke, R., Hennrich, F., Kappes, M.M., Löhneysen, H.V., (2004) Nano Lett., 4, pp. 1395-1399Leon, J., Flacker, A., Vaz, A.R., Verissimo, C., Moraes, M.B., Moshkalev, S.A., (2010) J. Nanoscience. Nanotechnol., 10, pp. 6234-6239Gelamo, R.V., Rouxinol, F.P., Verissimo, C., Vaz, A.R., Moraes, M.A.B., Moshkalev, S.A., (2009) Chem. Phys. Lett., 482, pp. 302-306Savu, R., Silveira, J.V., Flacker, A., Vaz, A.R., Joanni, E., Pinto, A.C., Gobbi, A.L., Moshkalev, S.A., (2012) Rev. Sci. Instrum., 83. , 055104-6Ermakov, V., Alaferdov, A., Vaz, A., Baranov, A.V., Moshkalev, S., (2013) Nanotechnology, 24, pp. 1553011-15530110Lee, J.-O., Park, C., Kim, J.-J., Kim, J., Park, J.W., Yoo, K.-H., (2000) J. Phys. D: Appl. Phys., 33, pp. 1953-1956Rouxinol, F., Gelamo, R., Amici, R.G., Vaz, A., Moshkalev, S., (2010) Appl. Phys. Lett., 97, pp. 2531041-2531043Huang, F.M., Yue, K.T., Tan, P.H., Zhang, S.L., Shi, Z.J., Zhou, X.H., Gu, Z.N., (1998) J. Appl. Phys., 84, pp. 4022-4024Cancado, L.G., Takai, K., Enoki, T., Endo, M., Kim, Y.A., Mizusaki, H., Jorio, A., Primenta, M.A., (2006) Appl. Phys. Lett., 88, p. 163106Moshkalev, S.A., J. Nanoelectr. Optoelectr., , in pressHsu, I.-K., Pettes, M.T., Aykol, M., Shi, L., Cronin, S.B., (2010) J. Appl. Phys., 108, p. 08430
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
Electrical Characterization Of Platinum Thin Films Deposited By Focused Ion Beam
No full textDual beam FIB (focused ion beam)/SEM (scanning elelctron microscope) systems are commonly used for imaging, selective etch and deposition of materials like platinum. The paper presents the results of electrical characterization of platinum thin films deposited by focused ion beam. For measurements, two types of test structures were fabricated: (i) 150×150 μm and 20×20 μm squares with thickness of 5, 10, 30 and 100 nm, and (ii) 30 μm long resistors with variable cross - section (50 nm × 50nm to 1 μm × 1μm). The Pt film resistivity has been measured by a four points probe method, to give the value of ∼10 × 10 -4 Ω.cm. © The Electrochemical Society.91235241Selinger, R.L., Fleming, W.P., (1974) Journal of Applied Physics, 45, pp. 1416-1422Go, M.S.H., Focused ion beam fabrication of junctions in the charge density wave conductor NbSe, (2001), M.S. thesis, Delft Univ. of Technol, Delft, The NetherlandsTao, T., Ro, J.S., Melngailis, J., Xue, Z., Kaesz, H.D., (1990) J. Vac. Sci. Technol, B 8 (6), pp. 1826-1829van der Pauw, L.J., (1958) Phillips Res. Rep, 13, pp. 1-9Tay, M., Li, K., Wu, Y., (2005) J. Vac. Sci. Technol, B 8 (23 4), pp. 1412-1416Kanagawa, T., Hobara, R., Matsuda, I., Tanikawa, T., Natori, A., Hasegawa, S., (2003) Physical Review Letters, 91 (3)Smith, S., Walton, A.J., Bond, S., Ross, A.W.S., Stevenson, J.T.M., Gundlach, A.M., (2003) IEEE Transactions on Semiconductor Manufacturing, 16 (2), pp. 199-206Ko, D., Park, Y.M., Kim, S., Kim, Y., (2007) Ultramicroscopy, 107, pp. 368-373Salvadori, M.C., Vaz, A.R., Farias, R.J.C., Cattani, M., (2004) Surface Review and Letters, 11 (2), pp. 223-22
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
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