1,721,009 research outputs found
Impact factor of Geriatrics & Gerontology Journals in 2003
No full textThe changes of Impact Factor (IF) values reported by Journal of Citation Reports (JCR) regarding the Journals of Geriatrics & Gerontology and those of Medicine, General and Internal are considered in the period from 2000 to 2003. The last category shows greater values of IF which are also more stable in the time with respect to Geriatrics & Gerontology. A faster transition of the research results into clinical geriatric practice is to advise in the next future
Air-guiding photonic crystal fibers with modified honeycomb lattice
No full textAir-guiding has been demonstrated in a modified honeycomb photonic crystal fiber. The confinement losses and dispersion properties are numerically investigated by means of the finite element method (FEM). A guided mode with more than 98% of power propagating in air has been found over a wavelength range of about 200 nm. By means of a proper design, confinement losses lower than 0.1 dB/Km at λ = 1.55 μm can be obtained with ten cell rings and an air filling fraction of 74.4%
Polarization splitter based on a square-lattice photonic-crystal fiber
No full textA three-core polarization splitter based on a square-lattice photonic-crystal fiber is presented. The component separates the input field into two orthogonally polarized beams that are coupled to the horizontal and vertical output ports. The splitter has been designed through modal and beam propagation analysis by employing high-performance codes based on the finite-element method. Results obtained for a device length of 20 mm show extinction ratios as low as -23 dB with bandwidths as great as 90 nm. (c) 2006 Optical Society of America
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
Amplificatore basato sulle perdite di curvatura di una fibra drogata con erbio a cladding depresso
No full textSviluppo di un microscopio ottico a scansione di campo vicino per la caratterizzazione di fibre a cristallo fotonico
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