1,721,388 research outputs found
Design of a compact objective for SWIR applications
Get PDFLately the short-wave infrared (SWIR) has become very important due to the recent appearance on the market of the small detectors with a large focal plane array. Military applications for SWIR cameras include handheld and airborne systems with long range detection requirements, but where volume and weight restrictions must be considered. In this paper we present three different designs of telephoto objectives that have been designed according to three different methods. Firstly the conventional method where the starting point of the design is an existing design. Secondly we will face design starting from the design of an aplanatic system. And finally the simultaneous multiple surfaces (SMS) method, where the starting point is the input wavefronts that we choose. The designs are compared in terms of optical performance, volume, weight and manufacturability. Because the objectives have been designed for the SWIR waveband, the color correction has important implications in the choice of glass that will be discussed in detai
Las ciencias y sus métodos. José Maria García Prada, Manuel González de Lafuente, José Luis Izquieta, José Antonio Lobo, Fernando Muñoz Box, Jésus Pascual Arranz
No full textSalvat B. Pablo. Las ciencias y sus métodos. José Maria García Prada, Manuel González de Lafuente, José Luis Izquieta, José Antonio Lobo, Fernando Muñoz Box, Jésus Pascual Arranz. In: Revue Philosophique de Louvain. Quatrième série, tome 84, n°63, 1986. pp. 411-412
Fernando Muñoz de la Presa, alias Sīdī cAlī: un renegado palentino en el Túnez otomano
No full textEn este artículo se evoca el destino de algunos españoles originarios del nortepeninsular que, víctimas del corso berberisco y cautivos en el Túnez otomano,renegaron de la fe católica y adoptaron una nueva identidad en tierra de islam; másprecisamente, se esboza la peripecia vital del palentino Fernando Muñoz de la Presa,personaje singular que, convertido ya en Sīdī cAlī, logró hacer fortuna en tierrasnorteafricanas. Disponemos para ello de una fuente excepcional en los escritos deltrinitario toledano fray Francisco Ximénez, en especial su Diario de Túnez, así comoen la literatura de redención coetánea y en la documentación del Archivio Storicode Propaganda Fide de Roma. Frente a las evocaciones biográficas de renegadosque conocemos a través de los procesos inquisitoriales, se ofrece aquí un relatovívido y más personal de la conversión de un palentino en el Túnez dieciochista
TRIBUNAL ARBITRAL DE LUIS FERNANDO MUÑOZ DÍAZ VS. CONJUNTO RESIDENCIAL TORRES DE MARSELLA P.H.
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Solid catadioptric telephoto lens design with SMS method
Get PDFTwo new optical structures are designed using the Simultaneous Multiple Surfaces (SMS) method, comprised of 2 reflecting surfaces and 2 refracting surfaces, 800mm focal length, f/8 (aperture diameter 100 mm) and 1.180 diagonal field of view in the SWIR band. The lens surfaces are rotational symmetric and calculated to have good control of non-paraxial rays. We have achieved designs with excellent performance, and with total system length of less than 60 mm
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
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