1,720,956 research outputs found
Spectral Bandwidth Analysis Of High Sensitivity Refractive Index Sensor Based On Multimode Interference Fiber Device
Full text linkFiber optic structures based on multimode interference were investigated to the refractive index (RI) sensing. The proposed device is a singlemode-multimode-singlemode (SMS) structure, where the multimode section is a coreless fiber (MMF). The numerical analyses were carried out by beam propagation and modal expansion methods. Ultra-high sensitivity was obtained: 827 nm/RIU over a RI range of 1.30-1.44 and a maximum sensitivity of 3500 nm/RIU for RI∼1.43, considering △RI = 0.01. The dependence of spectral bandwidth was investigated taking into account the multimode fiber diameter and the coupling efficiency between modes at the input junction singlemode- multimode. © 2012 SPIE.8421Aguilar-Soto, J.G., Antonio-Lopez, J.E., Sanchez-Mondragon, J.J., May-Arrioja, D.A., Fiber optic temperature sensor based on multimode interference effects (2011) Proceedings of XVII Reunión Iberoamericana de Óptica & X Encuentro de Óptica, Láseres y Aplicaciones, Journal of Physics: Conference Series, 274, pp. 1-4Nguyen, L.V., Hwang, D., Moon, S., Moon, D.S., Chung, Y., High temperature fiber sensor with high sensitivity based on core diameter mismatch (2008) Optics Express, 16 (15), pp. 11369-11375Hatta, A.M., Rajan, G., Semenova, Y., Farrell, G., SMS fibre structure for temperature measurement using a simple intensity-based interrogation system (2009) Electronics Lett., 45 (21)Silva, S., Pachon, E.G.P., Franco, M.A.R., Hayashi, J.G., Malcata, F.X., Frazão, O., Jorge, P., Cordeiro, C.M.B., Ultra-high sensitivity-temperature fiber sensor based on multimode interference Applied Optics, , accepted to publicationWang, P., Brambilla, G., Ding, M., Semenova, Y., Wu, Q., Farrell, G., Investigation of single-mode-multimode-single-mode and single-mode-tapered-multimode-single-mode fiber structures and their application for refractive index sensing (2011) J. Opt. Soc. Am. B, 28 (5), pp. 1180-1186Wu, Q., Semenova, Y., Wang, P., Farrell, G., High sensitivity SMS fiber structure based refractometer-analysis and experiment (2011) Optics Express, 19 (9), pp. 7937-7944Jin, Y.X., Chan, C.C., Zhao, Y., Dong, X.Y., Refractive index measurement by using multimode interference (2011) Proceedings of 21st International Conference on Optical Fiber Sensors, Proc. of SPIE, 7753, pp. 77535FZhang, C., Li, E., Peng, L.V., Wang, W., A wavelength encoded optical fiber sensor based on multimode interference in a coreless silica fiber (2009) Proceedings of International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, Proc. SPIE SPIE, 7157, pp. 71570HWang, P., Brambilla, G., Ding, M., Semenova, Y., Wu, Q., Farrell, G., High-sensitivity, evanescent field refractometric sensor based on a tapered, multimode fiber interference (2011) Opt. Lett., 36, pp. 2233-2235Mehta, A., Mohammed, W., Johnson, E.G., Multimode interference-based fiber-optic displacement sensor (2003) IEEE Photon. Technol. Lett., 15, pp. 1129-1131Hatta, A.M., Semenova, Y., Wu, Q., Farrell, G., Strain sensor based on a pair of single-mode-multimodesingle-mode fiber structures in a ratiometric power measurement scheme (2010) Appl. Opt., 49, pp. 536-541Silva, S., Frazão, O., Viegas, J., Ferreira, L.A., Araújo, F.M., Malcata, F.X., Santos, J.L., Temperature and strain-independent curvature sensor based on a singlemode/multimode fiber optic structure (2011) Meas. Sci. Technol., 22, p. 085201Soldano, L.B., Pennings, E.C.M., Optical multi-mode interference devices based on self-imaging: Principles and applications (1995) J. Lightwave Technol., 13 (4), pp. 615-62
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
Curvature And Temperature Discrimination Using Multimode Interference Fiber Optic Structuresa Proof Of Concept
No full textSinglemode-multimode-singlemode fiber structures (SMS) based on distinct sections of a pure silica multimode fiber (coreless-MMF) with diameters of 125 and 55 μm, were reported for the measurement of curvature and temperature. The sensing concept relies on the multimode interference that occurs in the coreless-MMF section and, in accordance with the length of the MMF section used, two fiber devices were developed: one based on a bandpass filter (self-image effect) and the other on a band-rejection filter. Maximum sensitivities of 64.7 nṁm and 13.08 pm° C could be attained, for curvature and temperature, respectively, using the band-rejection filter with 55 μ m-MMF diameter. A proof of concept was also explored for the simultaneous measurement of curvature and temperature by means of the matrix method. © 2012 IEEE.302335693575Soldano, L.B., Pennings, E.C.M., Optical multi-mode interference devices based on self-imaging: Principles and applications (1995) J. Lightw. Technol, 13, pp. 615-627Frazão, O., Silva, S., Viegas, J., Ferreira, L.A., Araújo, F.M., Santos, J.L., Optical fiber refractometry based on multimode interference (2011) Appl. Opt, 50, pp. E184-188Mohammed, W.S., Smith, P.W.E., Gu, X., All-fiber multimode interference bandpass filter (2006) Optics Letters, 31 (17), pp. 2547-2549. , DOI 10.1364/OL.31.002547Biazoli, C.R., Silva, S., Franco, M.A.R., Frazão, O., Cordeiro, C.M.B., Multimode interference tapered fiber refractive index sensors Appl. Opt., , submittedCastillo-Guzman, A., Antonio-Lopez, J.E., Selvas-Aguilar, R., May-Arrioja, D.A., Estudillo-Ayala, J., Wa, P.L., Widely tunable erbium-doped fiber laser based on multimode interference effect (2010) Opt. Exp, 18, pp. 591-597Li, E., Sensitivity-enhanced fiber-optic strain sensor based on interference of higher order modes in circular fibers (2007) IEEE Photon. Technol. Lett, 19, pp. 1266-1268Gao, R.X., Wang, Q., Zhao, F., Meng, B., Qu, S.L., Optimal design and fabrication of SMS fiber temperature sensor for liquid (2010) Opt. Commun, 283, pp. 3149-3152Gong, Y., Zhao, T., Rao, Y., Wu, Y., All-fiber curvature sensor based on multimode interference (2011) IEEE Photon. Technol. Lett, 23, pp. 679-681Silva, S., Pachon, E.G.P., Franco, M.A.R., Hayashi, J.G., Malcata, F.X., Frazão, O., Jorge, P., Cordeiro, C.M.B., Ultra-high temperaturesensitivity sensor based on multimode interference (2012) Appl. Opt, 51, pp. 3236-3242Wu, Q., Semenova, Y., Hatta, A.M., Wang, P., Farrell, G., Singlemode-multimode-singlemode fiber structures for simultaneous measurement of strain and temperature (2011) Microw. Opt. Technol. Lett, 53, pp. 2181-2185Coelho, L., Kobelke, J., Schuster, K., Frazão, O., Multimode interference in outer cladding large-core air-clad photonic crystal fiber (2012) Microw. Opt. Technol. Lett, 54, pp. 1009-1011Silva, S., Frazão, O., Viegas, J., Ferreira, L.A., Araújo, F.M., Malcata, F.X., Santos, J.L., Temperature and strain-independent curvature sensor based on a singlemode/multimode fiber optic structure (2011) Meas. Sci. Technol, 22, p. 085201Jin, W., Michie, W.C., Thursby, G., Konstantaki, M., Culshaw, B., Simultaneous measurement of strain and temperature: Error analysis (1997) Optical Engineering, 36 (2), pp. 598-609Okamoto, K., (2006) Fundamentals of Optical Waveguides, , NewYork: ElsevierKawano, K., Kitoh, T., (2001) Introduction to Optical Waveguide Analysis, pp. 165-230. , New York: Wiley ch.
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
- …
