Scipedia

    Methodological Approaches to Study Interactivity in Communication Journals

    No full text
    The aim of this paper is to map out the research around the concept of interactivity, as well as to point out the dominant streams and underresearched areas. It is based upon the content analysis of methods employed in articles published in five topranking communication journals over five year period (200610). The review of methods applied in research of interactivity is based upon distinction between social interactivity, textual interactivity and technical interactivity. This classification is further developed by adding the category of levels of interactivity (low, medium and high) which allows further classification of different mediated practices. This leads to specification of nine theoretical subsets of interactivity as the main categories of the analysis of research articles. Within this matrix we have situated diverse methods that respond to conceptually different types and levels of audience/users interactivity. The analysis shows that scholarly focus lies within the low textual and the high social interactive practices, whereas the high technical and high textual interactivity are underresearched areas. Investigations into the audience/users relations with texts are mainly orientated towards content analyses and surveys. High social interaction research is reviving the application of ethnographic methods, while the possibilities of technical interactivity are embraced not as an object but as a tool for research

    Diseño sísmico de marcos no dúctiles de concreto reforzado con disipadores de energía histeréticos: Definición de parámetros de diseño

    Get PDF
    En este trabajo los autores resumen los resultados de un estudio paramétrico dedicado a evaluar, mediante análisis estáticos no lineales (pushover), parámetros globales de diseño sísmico que puedan insertarse transparentemente al Apéndice A de NTCS-04 y al Manual de Obras Civiles (MOC-2008) vigentes, para marcos de concreto reforzado no dúctiles con dispositivos de disipación de energía por histéresis montados en contraventeo chevrón. Para ello se diseñaron marcos cuyas alturas oscilaron entre 5 y 25 niveles utilizando diferentes balances de rigidez entre el sistema contraviento-dispositivo histerético y el marco resistente a momento (α). También, se consideraron diferentes balances de rigidez elástica entre el disipador histerético y los contravientos de soporte (β). Además, a partir de los resultados observados en distintas investigaciones experimentales con este tipo de dispositivos, se evaluaron las pendientes posteriores a fluencia (K2) de los disipadores, incluyendo aquéllos que se idealizan como elastoplásticos perfectos, y para pendientes de 3% y 5%. Por último, se consideraron dos ángulos de inclinación de los contravientos con respecto al eje horizontal (θ): 40° y 45°, considerando alturas de entrepiso y claros típicos usados en la práctica ingenieril mexicana. De los resultados obtenidos en el estudio se definen balances "óptimos" de rigidez α y β que lideran a obtener mecanismos últimos satisfactorios donde los disipadores por histéresis fluyen primero y desarrollan su máxima ductilidad por desplazamiento μ, mientras que en el marco de concreto reforzado se desarrollan solamente fluencias incipientes en los extremos de las vigas. Finalmente, se hacen comentarios adicionales en relación con: (a) las relaciones entre la capacidad de ductilidad global (Q) del sistema y la ductilidad local de los disipadores histeréticos (μ) para una combinación determinada de α, β, K2 y θ, (b) las distorsiones de entrepiso y su relación con el balance de rigidez seleccionado α y, (c) factores de sobrerresistencia (R) para fines de diseño

    Evaluacion de la erosión en limos loessicos compactados a través de ensayos de filtración

    Get PDF
    El limo arenoso de las formaciones loéssicas se caracteriza por su alta sensibilidad a los cambios de humedad. Esta condición lo cataloga como internamente inestable. A pesar de calificación, se constituye, en un material aplicable a diversas construcciones (viales e hidráulicas). Algunas referencias bibliográficas cuestionan la aplicación de estos materiales en obras de infraestructura debido a su potencialidad de erosión. En otros casos, se indica que, para un adecuado funcionamiento el sistema debe contar con filtros de protección. En particular, los limos arenosos estudiados pueden considerarse incluidos en el grupo de aquellos materiales pasibles de sufrir procesos de sufusión, o inestabilidad interna de la estructura del suelo. En consecuencia, es de interés entender bajo qué condiciones se produce la erosión y que magnitud puede alcanzar. Si se aplica un filtro, el mismo debe actuar controlando la perdida de material y asegurando la estabilidad del flujo. Este estudio muestra los resultados experimentales del análisis del fenómeno de erosión en limos loéssicos con bajo nivel de compactación. Se han efectuado ensayos de filtración para la evaluación de la erosión y para el estudio de comportamiento de los sistemas suelo-filtro. La metodología de ensayo aplicada procura el seguimiento de los lineamientos de estudio que actualmente se discuten a nivel mundial. Los estudios se han concentrado en el análisis de la influencia de variables tales como: grado de compactación, gradiente hidráulico y composición del material de filtro. Los resultados obtenidos permiten establecer lineamientos de recomendaciones de aplicación en referencia al comportamiento esperado y la constitución de los sistemas de filtro, a fin de controlar adecuadamente la sufusión

    cybermedia economics: revenue model and sources of financing

    Get PDF
    The paper proposes an approach to the study of the economics of cybermedia, with the aim of describing the structure and economic logic of communications and cultural industries on the Internet. Given the breadth of the subject, the article analyzes the economics of cybermedia by studying the competitive model of the industry, describing the main actors involved in this market and analysing the business and financing model of cybermedia, with a focus on revenue structure

    The need for end-user customization of the journal-sets of the subject categories in the Scimago Journal Ranking Database for more appropriate league lists. A case study for the library & information science field

    Get PDF
    The open access SCImago Journal & Country Rank (SJR) service -built from data in the subscription-based Elsevier ’s Scopus database- offers bibliographic information and bibliometric indicators for nearly 20,000 journals and other serial publications for 1996-2011. Journals are assigned to 300+ pre-defined subject categories and 26 broad subject areas to produce league lists. The set of 134 journals assigned to the Library and Information Sciences (LIS) subject category and a sample set of 50 other LIS journals, scattered across several other categories, were analyzed in the latest edition (SJR - 2011). Recommendations are made on how SJR could be enhanced by its developers to include simple customization options in the interface to facilitate a more efficient look-up and more valid comparison of the standing of journals and other serials and to reflect the prevailing preferences at the institutions where the rank positions in journal league lists are used to inform career advancement and funding decisions. It is argued that extending the current three-year citation window to five years would be more appropriate for all disciplines, and would also make SJR  comparable to metricsbased journal league lists produced from the open access Microsoft Academic Search  (MAS ), Google Scholar Metrics for Publications (GSMP ), and Eigenfactor.org (EF) data and the subscription-based Journal Citation Reports (JCR), which pioneered the idea of a metrics-based journal league list

    A compressible Lagrangian framework for the simulation of underwater implosion problems

    Get PDF
    The development of efficient algorithms to understand implosion dynamics presents a number of challenges. The foremost challenge is to efficiently represent the coupled compressible fluid dynamics of internal air and surrounding water. Secondly, the method must allow one to accurately detect or follow the interface between the phases. Finally, it must be capable of resolving any shock waves which may be created in air or water during the final stage of the collapse. We present a fully Lagrangian compressible numerical framework for the simulation of underwater implosion. Both air and water are considered compressible and the equations for the Lagrangian shock hydrodynamics are stabilized via a variationally consistent multiscale method. A nodally perfect matched definition of the interface is used and then the kinetic variables, pressure and density, are duplicated at the interface level. An adaptive mesh generation procedure, which respects the interface connectivities, is applied to provide enough refinement at the interface level. This framework is then used to simulate the underwater implosion of a large cylindrical bubble, with a size in the order of cm. Rapid collapse and growth of the bubble occurred on very small spatial (0.3mm), and time (0.1ms) scales followed by Rayleigh-Taylor instabilities at the interface, in addition to the shock waves traveling in the fluid domains are among the phenomena that are observed in the simulation. We then extend our framework to model the underwater implosion of a cylindrical aluminum container considering a monolithic fluid-structure interaction (FSI). The aluminum cylinder, which separates the internal atmospheric-pressure air from the external high-pressure water, is modeled by a three node rotation-free shell element. The cylinder undergoes fast transient deformations, large enough to produce self-contact along it. A novel elastic frictionless contact model is used to detect contact and compute the non-penetrating forces in the discretized domain between the mid-planes of the shell. Two schemes are tested, implicit using the predictor/multi-corrector Bossak scheme, and explicit, using the forward Euler scheme. The results of the two simulations are compared with experimental data

    What is happening to library and information studies in Spanish universities?

    Get PDF
    This article aims to provide an overview of the current state of library and information science (LIS) education in Spanish universities. Data have been gathered from official statistical sources (Spanish Ministry of Education, Culture and Sports and National Institute of Statistics) and universities’ annual reports, in order to complement data provided by members of the Spanish Network of Information and Documentation University Centers and Departments  (RUID). Among other issues, a general decrease in the demand of LIS undergraduate studies and a slight increase in postgraduate studies are observed. Finally, the article presents several reflections on the challenges that these studies are currently facing, and suggests strategies that may be followed to strengthen not only LIS education but also the profession as a whole in this country

    Desarrollo de una metodología simplificada para estudios de microzonificación sísmica

    Get PDF
    En este artículo se presenta el desarrollo de una metodología simplificada para realizar estudios de microzonificación sísmica. La metodología se considera simplificada porque a diferencia de un proyecto de microzonificación convencional, no requiere realizar campañas de ensayos geofísicos que conllevan fondos sustanciales. La metodología propuesta se basa en el uso de capas de suelo equivalentes. Esta consiste en representar un depósito de suelo de múltiples capas mediante otro de una sola capa equivalente, usando la fórmula del periodo natural fundamental de un depósito uniforme. Las capas de suelo equivalentes se definen con información proveniente de los periodos de un mapa de isoperiodos y la velocidad de ondas S obtenida de forma indirecta de un mapa de tipos de perfil de suelo. Como caso de estudio se aplicó la metodología desarrollada a la ciudad de Mayagüez, Puerto Rico. Uno de los aportes principales del estudio es que la metodología desarrollada se puede aplicar a otras localidades donde se cuente con la información de la clasificación sísmica de los tipos de suelo y sus periodos naturales. También para la ciudad de Mayagüez se generó en una plataforma de ArcGIS© un mapa de microzonificación sísmica donde los usuarios interesados pueden acceder a los parámetros que definen el espectro de diseño sísmico de una manera interactiva

    H Index Scholar: the h-index for Spanish public universities’ professors of humanities and social sciences

    Get PDF
    The H-Index Scholar is a bibliometric index that measures the productivity and scientific impact of the academic production in humanities and social sciences by professors and researchers at public Spanish universities. The methodology consisted of counting their publications and citations received in Google Scholar. The main features and characteristics of the index are explained. Despite technical and methodological problems that Google Scholar  might have as a source of information, the authors estimate that they do not affect substantially the calculated h and g indexes, probably being the error lower than 10%. The total population analyzed was 40,993 researchers, but data are displayed only for 13,518 researchers, the ones located in the first tertile of their respective areas
    Scipedia
    Repository Dashboard
    Do you manage Scipedia? Access insider analytics, issue reports and manage access to outputs from your repository in the CORE Repository Dashboard!

    We use cookies to improve our website.

    Learn more