No abstract

This article presents part of the findings of a wider empirical study focusing on memories of three generations in Mexico. The study investigated the relationships between the three generational groups, their access to, and reception of, different media technologies, and how these affected the construction of their media memories. The authors show how social class, gender and age, and different media technologies (such as radio, television and the internet) interact to form media memories of ‘global’ events. Access to, and familiarity with, these material support systems combined with the social distribution of specific kinds of cognitive dispositions are the key conditions for making sense of media messages. Contesting some assumptions about the ‘globality’ of media messages and experiences, this article’s conclusions and findings provide empirical evidence of a more complex situation. The study found only a limited ‘global’ effect on the lower social classes, who form the majority of the population; in contrast, it was the privileged social classes of peripheral countries who ‘behaved’ in a global way and expressed their memories as ‘global’.

Debido a la sencillez de su registro y a la facilidad relativa de su análisis, los microtremores se han convertido en una herramienta de gran utilidad para los estudios de microzonificación sísmica. El método SPAC propuesto por Aki (1957) permite obtener información sobre la estratigrafía del sitio en estudio, a partir de registros de microtremores obtenidos con un arreglo instrumental. El efecto de sitio, caracterizado por el periodo dominante y la amplificación, se estima con la estratigrafía obtenida. En este artículo se presentan las generalidades del método SPAC, su aplicación a registros de un arreglo instrumental en Ciudad Universitaria, México, y se realiza una comparación con los resultados obtenidos con el método de F-K por Kagawa (1996). La estructura de velocidades obtenida en este trabajo es consistente con la obtenida por Kagawa (1996). También se concluye que el método SPAC es más eficiente que el método F-K, pues requiere menor número de arreglos y menor número de estaciones por arreglo para obtener los mismos resultados. También se presenta la función de transferencia del modelo de velocidades obtenido, y se compara con la función de transferencia del modelo de velocidades de Kagawa, y también con la obtenida con cocientes espectrales de datos de terremotos. Este ejemplo muestra que a partir de registros de microtremores y el método SPAC es posible realizar una estimación confiable de la estructura de velocidades.

In the librarianship literature, blended librarians are integral professionals with the theoretical knowledge of Library and Information Science and simultaneous competences allowing them to deal with printed and digital information; they also have the knowledge on the use and management of information and communication technologies (ICTs). Considering the aforementioned, this paper debates: 1) the ideas of innovation and technological innovation models; 2) the disruptive technological innovation and its connection with the current library and information science scenario; and 3) the blended librarian and its challenges in the information systematization for access, retrieval and information services in a digital world context.

Guadalajara, Jalisco, is the second largest city in Mexico with around 4.5 million inhabitants. A high seismic hazard exists in the city due to forces produced by the interaction between the Rivera, Cocos and North American plates and the smaller Jalisco Block. Guadalajara is one of the largest cities built over pumice soil deposits. Furthermore, the near‐surface phreatic level causes a high susceptibility to liquefaction. All these features can cause extreme earthquake site effects. Due to the fragile inner structure of pumice sands, traditional geotechnical tests are inappropriate to characterize the seismic response. Therefore, we propose the use of surface wave analysis methods (multichannel analysis of surface waves and refraction microtremor), which we applied in 33 sites to define the soil classification in terms of VS30 (the average shear wave velocity between the surface and 30 m depth), the bedrock depth and the fundamental period. From the soil classification, we construct a microzonation map consisting of four geotechnical zones, which we superimpose on the known construction systems within the city. The comparison between the construction period of the buildings and the fundamental frequencies of the soil indicates a high vulnerability to resonance in 1‐ to 4‐storied old buildings constructed of adobe and unreinforced masonry within zones II and III, followed by a medium vulnerability to seismic resonance in compact buildings of 1–4 stories within zone I and 1–12 stories within zones II and IV.