Dynamic investigation of an ancient masonry bell tower with operational modal analysis: a non-destructive experimental technique to obtain the dynamic characteristics of a structure

This paper shows the results of an experimental analysis on the bell tower of “Chiesa della Maddalena” (Mola di Bari, Italy), to better understand the structural behavior of slender masonry structures. The research aims to calibrate a numerical model by means of the Operational Modal Analysis (OMA) method. In this way realistic conclusions about the dynamic behavior of the structure are obtained. The choice of using an OMA derives from the necessity to know the modal parameters of a structure with a non-destructive testing, especially in case of cultural-historical value structures. Therefore by means of an easy and accurate process, it is possible to acquire in-situ environmental vibrations. The data collected are very important to estimate the mode shapes, the natural frequencies and the damping ratios of the structure. To analyze the data obtained from the monitoring, the Peak Picking method has been applied to the Fast Fourier Transforms (FFT) of the signals in order to identify the values of the effective natural frequencies and damping factors of the structure. The main frequencies and the damping ratios have been determined from measurements at some relevant locations. The responses have been then extrapolated and extended to the entire tower through a 3-D Finite Element Model. In this way, knowing the modes of vibration, it has been possible to understand the overall dynamic behavior of the structure.

La (autoantonimia) al-ḍdad en las lenguas, según la teoría “el esquema básico de la referencia”

En nuestro artículo, vamos a analizar qué quiere decir de autoantonimia (al-ḍdad), las razones de su aparición en la lengua según las opiniones de los antiguos lingüistas árabes, y, finalmente, vamos a escoger algunas palabras autoantónimas, tanto en la lengua árabe como en la lengua española, dando explicaciones de su aparición según nuestra teoría “el esquema básico de la referencia”, que es una teoría desarrollada a partir del legado árabe y la teoría cognitiva, por eso hemos usado la terminología de la gramática cognitiva. Según esta teoría, el signo lingüístico es la interacción entre cuatro componentes: la percepción, la imaginación, la comprensión y la simbolización. Nuestra teoría pretende ser la base de una lingüística moderna y holística, muy diferente de la lingüística tradicional. Es el primer artículo académico sobre el tema de las palabras autoantónimas en la lengua española.

Social Changes Reflected in Specialized Languages: Lexical Re-/deconstruction in Lesbian Studies

One of the most important factors of recognition, belonging and identification in scientific communities is their specialized language: doctors, mathematicians and anthropologists feel they are part of a group with which they can interact because they share a common “language”. While ideology is present in all academic registers, it is in human sciences where its presence (or absence) leads to more visible linguistic phenomena. An interesting example is that of lesbian studies: as non-heterosexual members of society have become less stigmatized, lesbian studies have developed a language of their own. In our paper, we shall explore the mechanisms used in the creation of specific vocabulary in this academic area, paying special attention to the refashioning or deconstruction of meaning of established terms as a result of changes in social perception or the challenging of pre-determined meanings.