1,720,964 research outputs found
Spontaneous Periodic Diameter Oscillations In Inp Nanowires: The Role Of Interface Instabilities
No full textWe have observed that thin InP nanowires generated by vapor-liquid-solid growth display spontaneous periodic diameter oscillations when large group III supersaturations are used. Diameter variations are associated with a large number of stacking faults and crystallographic phase changes(wurtzite/zinc- blende); also the axial distance between oscillations depends on the indium precursor flow used during the run. We attribute the morphology changes to a substantial deformation of the triple phase line (vapor-liquid-solid) at the catalyst nanoparticle edge originated from multistep nucleation during growth. The deformation alters the mechanical force balance acting on the nanoparticle during growth in such a way that the particle displaces from the nanowire top and wets the nanowire sidewall. Subsequently, as catalytic growth occurs at the sidewall, the associated increase in diameter will eventually push the NP back to its original wire-top position until the onset of a new instability at the triple phase line. © 2012 American Chemical Society.131913Yan, R., Gargas, D., Yang, P., (2009) Nat. Photonics, 3, pp. 569-576Duan, X., Huang, Y., Cui, Y., Wang, J., Lieber, C.M., (2001) Nature, 409, pp. 66-69Moreau, A.L.D., Janissen, R., Santos, C.A., Peroni, L.A., Stach-Machado, D.R., De Souza, A.A., De Souza, A.P., Cotta, M.A., (2012) Biosen. Bioelectron., 36, pp. 62-68Mokkapati, S., Jagadish, C., (2009) Mater. Today, 12, pp. 22-32Chau, R., Doyle, B., Datta, S., Kavalieros, J., Zhang, K., (2007) Nat. Mater., 6, pp. 810-812Wagner, R., Ellis, W., (1964) Appl. Phys. Lett., 4, pp. 89-90Wallentin, J., Ek, M., Wallenberg, L.R., Samuelson, L., Deppert, K., Borgström, M.T., (2010) Nano Lett., pp. 4807-4812Caroff, P., Dick, K., Johansson, J., Messing, M., Deppert, K., Samuelson, L., (2008) Nat. Nanotechnol., 4, pp. 50-55Algra, R.E., Verheijen, M.A., Borgström, M.T., Feiner, L.-F., Immink, G., Van Enckevort, W.J.P., Vlieg, E., Bakkers, E.P.A.M., (2008) Nature, 456, pp. 369-372Wallentin, J., Ek, M., Wallenberg, L.R., Samuelson, L., Borgström, M.T., (2012) Nano Lett., 12, pp. 151-155Thelander, C., Caroff, P., Plissard, S., Dey, A.W., Dick, K.A., (2011) Nano Lett., 11, pp. 2424-2429Chiaramonte, T., Tizei, L.H.G., Ugarte, D., Cotta, M.A., (2011) Nano Lett., 11, pp. 1934-1940Zianni, X., (2010) Appl. Phys. Lett., 97, p. 233106Diedenhofen, S.L., Janssen, O.T.A., Grzela, G., Bakkers, E.P.A.M., Gómez Rivas, J., (2011) ACS Nano, 5, pp. 2316-2323Plissard, S.R., Slapak, D.R., Verheijen, M.A., Hocevar, M., Immink, G.W.G., Weperen, I., Van Nadj-Perge, S., Bakkers, E.P.A.M., (2012) Nano Lett., 12, pp. 1794-1798Ross, F.M., (2010) Rep. Prog. Phys., 73, p. 114501Joyce, H.J., Wong-Leung, J., Gao, Q., Tan, H.H., Jagadish, C., (2010) Nano Lett., 10, pp. 908-915Glas, F., Harmand, J.-C., Patriarche, G., (2007) Phys. Rev. Lett., 99, pp. 3-6Oh, S.H., Chisholm, M.F., Kauffmann, Y., Kaplan, W.D., Luo, W., Rühle, M., Scheu, C., (2010) Science (New York), 330, pp. 489-493Tizei, L.H.G., Craven, A.J., Zagonel, L., Tencé, M., Stéphan, O., Chiaramonte, T., Cotta, M.A., Ugarte, D., (2011) Phys. Rev. Lett., 107, pp. 1-5Dubrovskii, V.G., Cirlin, G.E., Sibirev, N.V., Jabeen, F., Harmand, J.C., Werner, P., (2011) Nano Lett., 11, pp. 1247-1253Dayeh, S.A., Yu, E.T., Wang, D., (2009) Nano Lett., 9, pp. 1967-1972Plante, M.C., Lapierre, R.R., (2009) J. Appl. Phys., 105, p. 114304Mohammad, S.N., (2008) Nano Lett., 8, pp. 1532-1538Kobayashi, Y., Kobayashi, N., (1992) Jpn. J. Appl. Phys., 31, p. 71Kobayashi, N., Benchimol, J.L., Alexandre, F., Gao, Y., (1987) Appl. Phys. Lett., 51, p. 1907Paiman, S., Gao, Q., Tan, H.H., Jagadish, C., Pemasiri, K., Montazeri, M., Jackson, H.E., Zou, J., (2009) Nanotechnology, 20, p. 225606Watanabe, Y., Hibino, H., Bhunia, S., Tateno, K., Sekiguchi, T., (2004) Phys. e, 24, pp. 133-137Tsao, J.Y., (1992) Materials Fundamentals of Molecular Beam Epitaxy, p. 301. , 1 st ed. Academic Press: New YorkNebol'Sin, V., Shchetinin, A., (2003) Inorg. Mater., 39, pp. 899-903Dubrovskii, V.G., (2011) Tech. Phys. Lett., 37, pp. 53-57Rudolph, D., Hertenberger, S., Bolte, S., Paosangthong, W., Spirkoska, D., Döblinger, M., Bichler, M., Koblmüller, G., (2011) Nano Lett., 11, pp. 3848-3854Yu, X., Wang, H., Lu, J., Zhao, J., Misuraca, J., Xiong, P., Von Molnár, S., (2012) Nano Lett., 12, pp. 5436-544
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
Spatial Modulation Of Above-the-gap Cathodoluminescence In Inp Nanowires
No full textWe report the observation of light emission on wurtzite InP nanowires excited by fast electrons. The experiments were performed in a scanning transmission electron microscope using an in-house-built cathodoluminescence detector. Besides the exciton emission, at 850 nm, emission above the band gap from 400 to 800 nm was observed. In particular, this broad emission presented systematic periodic modulations indicating variations in the local excitation probability. The physical origin of the detected emission is not clear. Measurements of the spatial variation of the above-the-gap emission points to the formation of leaky cavity modes of a plasmonic nature along the nanowire length, indicating the wave nature of the excitation. 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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
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
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