1,724,282 research outputs found
Astronomische Nachrichten, nos 3883-3897
No full textAstronomische Nachrichten, nos 3883-3897. In: Bulletin astronomique, tome 22, 1905. pp. 121-128
Acousto-optic frequency switching for single-camera planar Doppler velocimetry
Full text linkA single-camera Planar Doppler velocimetry system has been demonstrated, in
which illumination beams at two closely-spaced optical frequencies are derived
from a single Argon-ion laser. The frequency of one beam lies on an absorption
line of iodine vapour, and the other just off the absorption line. The beams
sequentially illuminate a plane within a seeded flow and the Doppler-shifted
scattered light passes through an iodine cell onto a single solid-state camera.
Light scattered from the measurement plane from the beam with its wavelength set
to be off the absorption line is not affected by its passage through the cell,
and provides a reference image, while that from the beam on the absorption line
encodes the velocity information as a variation in transmission dependent upon
the Doppler shift. The complex imaging system required for conventional PDV is
eliminated, since superposition of the reference and signal images is automatic.
The two beams are generated by an optical arrangement incorporating an acoustio-
optic modulator, and are transmitted to the region of interest by a single mode
optical fibre, which ensures both a smooth Gaussian illumination profile and co-
linearity of the beams. The system is demonstrated using a spinning disc and a
velocity resolution of +/-1 ms-1 is achieved
Linked collectors and determiners for: Les spermaphytes de l'Herbier du Centre National de Floristique de Côte d'Ivoire: troisième partie..
No full textNatural history specimen data linked to collectors and determiners held within, "Les spermaphytes de l'Herbier du Centre National de Floristique de Côte d'Ivoire: troisième partie.". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/447944f5-3897-46ec-ad05-9b9d7a3ae39c">https://bionomia.net/dataset/447944f5-3897-46ec-ad05-9b9d7a3ae39c</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/447944f5-3897-46ec-ad05-9b9d7a3ae39c">https://gbif.org/dataset/447944f5-3897-46ec-ad05-9b9d7a3ae39c</a>. Formatted as a Frictionless Data package
[Atchison, Topeka & Santa Fe Ry. Co., Road No. 3897]
No full textVerso: Negative No. 9813, The Baldwin Locomotive Works, Santa Fe Locomotive, Class 14-54-1/4-F, 409, Road No. 3897, Built for Atchison, Topeka, & Santa Fe Ry., Railway Co.'s Class 380
Linked collectors and determiners for: Les spermaphytes de l'Herbier du Centre National de Floristique de Côte d'Ivoire: troisième partie..
No full textNatural history specimen data linked to collectors and determiners held within, "Les spermaphytes de l'Herbier du Centre National de Floristique de Côte d'Ivoire: troisième partie.". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/447944f5-3897-46ec-ad05-9b9d7a3ae39c">https://bionomia.net/dataset/447944f5-3897-46ec-ad05-9b9d7a3ae39c</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/447944f5-3897-46ec-ad05-9b9d7a3ae39c">https://gbif.org/dataset/447944f5-3897-46ec-ad05-9b9d7a3ae39c</a>. Formatted as a Frictionless Data package
Characterization of study population (weighted sample<sup>a</sup>, n = 3897).
No full textCharacterization of study population (weighted samplea, n = 3897).</p
Un nuevo dato sobre la leyenda de Alejandro Magno en España: el manuscrito 3897 de la Biblioteca Nacional de Madrid
Full text linkEl autor nos presenta la relación entre el manuscrito 3897 de Andrés de Cepeda y Lira, y el Libro de Alexandre, ambos en la Biblioteca Nacional de Madrid y escritos en castellano, dedicados a relatar la vida del emperador griego, Alejandro Magno. La obra de Cepeda es dedicada al duque de Osuna, propietario en su día del manuscrito, lo cual puede indicar que el autor tuvo la posibilidad de acceder a la biblioteca del duque y conocer el manuscrito y poder, de alguna manera, servirse de él para confeccionar su propio texto.The author presents us the relationship between Andrés de Cepeda y Lira's 3897 manuscripts and the Alexandre's Book, both at the National Library of Madrid and written in Spanish, dedicated to telling the life of the Greek emperor, Alexander the Great. The work of Cepeda is dedicated to the Duke of Osuna, owner of the manuscript, which may indicate that the author had the possibility of access to the library of the Duke and know the manuscript and could, in some way, use it to build your own text.peerReviewe
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
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