1,721,049 research outputs found
Nanoimprinting of Mesoporous Titania: Direct Patterning and Refractive Index Control in the Visible
Full text link[EN] Porous materials and nanocomposites have emerged as promising media for constructing high performance, tunable, responsive, and versatile optical platforms, with applications spanning diffractive and waveguide optics, metasurfaces, photonic sensors, and structural coatings. Despite their potential, achieving precise control over the structural and optical properties of these materials has remained a significant challenge, often requiring complex fabrication processes and post-lithography processing steps that limit scalability, sustainability, and practical implementation. In this work, upon the use of nanoimprinting of refractive index (NIRI) is reported to directly pattern mesoporous titania (pTiO2) and achieve localized, compression-based modulation of refractive index. Two formulations of sol-gel derived pTiO2 thin films are interrogated, revealing tunable refractive indices ranging from n approximate to 1.5 to n approximate to 2.2 at visible wavelengths in response to nanoimprinting-induced compression. Using a variety of micro-patterned stamps, the direct fabrication of planar diffractive and gradient index optics is demonstrated without any curing, etching, or post-lithography processing steps. These findings demonstrate that direct imprinting of pTiO(2) is a sustainable and effective method for controlling refractive index and fabricating optical devices, paving the way for future advancements in the development of compression-tuned optical materials and their diverse applications.This project was funded by the National Science Foundation (2047015); PROMETEO Program (CIPROM/2022/14) - Generalitat Valenciana; and the Spanish Ministerio de Ciencia e Innovacion (MCIN/AEI/10.13039/501100011033) through the PID2019-106965RB-C21 project. M. P. gratefully acknowledges the generous support from the United States Department of Defense Science, Mathematics, and Research for Transformation scholarship program funded by OUSD/R&E, National Defense Education Program/BA-1 Basic Research.Panipinto, M.;Martínez-Gómez-Aldaraví, Andrea;Ortiz de Zárate-Díaz, David;García-Rupérez, Jaime;Ryckman, JD. (2025). Nanoimprinting of Mesoporous Titania: Direct Patterning and Refractive Index Control in the Visible. Advanced Optical Materials. 13(27). https://doi.org/10.1002/adom.202501401S132
CREACIÓN DE PÁGINAS WEB CON CONTENIDO MULTIMEDIA UTILIZANDO JOOMLA 3.3
No full textLas páginas web multimedia son uno de los principales medios de los que disponemos hoy en día para hacer llegar nuestro mensaje a cualquier lugar del mundo, ya seamos una empresa, un grupo de música, un fotógrafo, o simplemente un particular que quiere compartir sus inquietudes.
En este libro se verá cómo podemos crear de forma sencilla una página web con contenidos multimedia haciendo uso del "Sistema de Gestión de Contenidos" Joomla 3.3, mediante el cual no es necesario disponer de conocimientos de programación web. A la hora de crear este documento se ha prestado especial atención al hecho de que pueda ser utilizado por cualquier persona, independientemente de los conocimientos previos que disponga en los temas de la creación web o la informática.García Rupérez, J. (2015). CREACIÓN DE PÁGINAS WEB CON CONTENIDO MULTIMEDIA UTILIZANDO JOOMLA 3.3. Editorial Universitat Politècnica de València. https://riunet.upv.es/handle/10251/67699EDITORIA
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
Estudio de los fenómenos de onda lenta y dispersión en estructuras periódicas de fotónica integrada
Full text linkEl desarrollo de las tecnologías ópticas de transmisión permite disponer hoy en día de grandes anchos de banda y elevadas velocidades de transmisión, lo que permite proporcionar servicios de una calidad cada vez mayor a un mayor número de usuarios. Para dar un paso más en el campo de las comunicaciones ópticas es necesario el desarrollo de dispositivos fotónicos que puedan realizar directamente en el dominio óptico las tareas de procesado de la red, sin necesidad de una conversión al dominio eléctrico que limite la velocidad de transmisión final. Una de las posibles alternativas para conseguir este tipo de dispositivos de procesado óptico es el uso de estructuras periódicas como los cristales fotónicos.
En esta tesis doctoral se ha estudiado la utilización de estructuras periódicas para la realización de funciones de procesado directamente en el dominio óptico, como el guiado, la creación de líneas de retardo y compensadores de dispersión ultracompactos, o la implementación de una puerta lógica XOR basada en elementos de onda lenta. Además de estas funcionalidades, también se han estudiado diversos aspectos de interés de este tipo de estructuras periódicas, como son la influencia de la longitud finita en guías de cristal fotónico, el uso de estructuras de onda lenta para la mejora de los efectos no lineales de los materiales, o el incremento de las pérdidas de propagación en las regiones de baja velocidad de grupo. También se ha propuesto una nueva configuración de cristal fotónico consistente en una red de columnas de Silicio en un medio de sílice, la cual proporciona una serie de ventajas respecto a las configuraciones de agujeros en un medio de alto índice utilizadas habitualmente.
Se han podido fabricar y caracterizar diversas muestras de algunas de las estructuras estudiadas teóricamente, lo que ha permitido comprobar que su comportamiento real se ajusta a los resultados obtenidos en la fase de diseño. Comentar que, tanto en la fase de diseño como en la de fGarcía Rupérez, J. (2008). Estudio de los fenómenos de onda lenta y dispersión en estructuras periódicas de fotónica integrada [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/2963Palanci
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
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
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