476 research outputs found
In the shadow of the church: the building of mosques in early medieval Syria
No full textIn his book In the Shadow of the Church: The Building of Mosques in Early Medieval Syria Mattia Guidetti examines the establishment of Muslim religious architecture within the Christian context in which it first appeared in the Syrian region, contributing to the debate on the transformation of late antique society to a Muslim one. He scrutinizes the slow process of conversion to Islam of the most important town centers by looking at religious places of both communities between the seventh and the eleventh century. The author assesses the relevancy of churches by analyzing the location of mosques and by researching phenomena of transfer of marble material from churches to mosques
Parametric autoresonance with time-delayed control
No full textEl artículo "Parametric autoresonance with time-delayed control", publicado en Physical Review E el 28 de enero de 2025, por Somnath Roy, Mattia Coccolo y Miguel A. F. Sanjuán, explora la influencia de un retraso temporal constante en sistemas autorresonantes paramétricos. Estos sistemas no lineales son impulsados por una fuerza con modulación paramétrica en frecuencia y una retroalimentación retardada negativa que mantiene el bloqueo de fase adiabático con la frecuencia de excitación. Este bloqueo de fase conduce a un crecimiento continuo de la amplitud, independientemente de las variaciones en los parámetros.
El estudio identifica un umbral crítico para la intensidad del retraso: por encima de este umbral, la autorresonancia se mantiene; por debajo, se debilita. Para analizar la interacción entre el retraso temporal y la estabilidad de la autorresonancia, los autores emplean métodos de perturbación de múltiples escalas para obtener resultados analíticos, los cuales son corroborados mediante simulaciones numéricas. El objetivo final es comprender y controlar la estabilidad de la autorresonancia a través de los parámetros de retraso temporal.
Este trabajo aporta una comprensión más profunda de cómo los retrasos temporales afectan la dinámica de sistemas autorresonantes y ofrece herramientas analíticas y numéricas para predecir y controlar su comportamiento. Las conclusiones podrían tener aplicaciones en campos donde la autorresonancia y el control de sistemas no lineales son relevantes.Investigamos cómo una demora temporal constante influye en un sistema autorresonante paramétrico. Este es un sistema no lineal impulsado por una fuerza con modulación paramétrica en frecuencia y una realimentación retardada negativa que mantiene el bloqueo de fase adiabático con la frecuencia de excitación. Este bloqueo de fase da lugar a un crecimiento continuo de la amplitud, independientemente de los cambios en los parámetros. Nuestro estudio revela un umbral crítico para la intensidad del retraso; por encima de este umbral, la autorresonancia se mantiene, mientras que por debajo de él, la autorresonancia se debilita. Examinamos la interacción entre el retraso temporal y la estabilidad de la autorresonancia, utilizando métodos de perturbación de múltiples escalas para obtener resultados analíticos, los cuales son corroborados mediante simulaciones numéricas. En última instancia, el objetivo es comprender y controlar la estabilidad de la autorresonancia a través de los parámetros de retraso temporal
Phase control of escapes in the fractional damped Helmholtz oscillator
No full textWe analyze the nonlinear Helmholtz oscillator in the presence of fractional damping, a characteristic feature in several physical situations. In our specific scenario, as well as in the non-fractional case, for large enough excitation amplitudes, all initial conditions are escaping from the potential well. To address this, we incorporate the phase control technique into a parametric term, a feature commonly encountered in real-world situations. In the non-fractional case it has been shown that, a phase difference of φOPT≈π, is the optimal value to avoid the escapes of the particles from the potential well. Here, our investigation focuses on understanding when particles escape, considering both the phase difference φ and the fractional parameter α as control parameters. Our findings unveil the robustness of phase control, as evidenced by the consistent oscillation of the optimal φ value around its non-fractional counterpart when varying the fractional parameter. Additionally, our results underscore the pivotal role of the fractional parameter in governing the proportion of bounded particles, even when utilizing the optimal phase
RESVERATROL-INDUCED AUTOPHAGY CONTRIBUTES TO THE INHIBITION OF EPSTEIN BARR VIRUS REPLICATION IN BURKITT’S LYMPHOMA CELLS
No full textRESVERATROL-INDUCED AUTOPHAGY CONTRIBUTES TO THE INHIBITION OF EPSTEIN BARR VIRUS REPLICATION IN BURKITT’S LYMPHOMA CELLS
De Leo Alessandra (a), Colavita Francesca (a), Arena Giuseppe (b), Mattia Elena (a)
(a) Dip. di Scienze di Sanità Pubblica e Malattie Infettive “Sanarelli”, Univ. di Roma “Sapienza”
(b) Casa Sollievo della Sofferenza Hospital, CSS-Mendel Institute, Roma
Presenting author: De Leo Alessandra, [email protected]
We have previously examined the antiviral activity of resveratrol on the replication of Epstein Barr Virus (EBV), the etiologic agent of infectious mononucleosis and associated with several types of malignancies of epithelial and lymphoid origin.
In a cellular context that allows in vitro EBV activation and lytic cycle progression through mechanisms closely resembling those that in vivo initiate and enable productive infection, we found that RV inhibited EBV lytic genes expression and the production of viral particles in a dose-dependent manner
Fractional damping effects on the transient dynamics of the Duffing oscillator
No full textWe consider the nonlinear Duffing oscillator in presence of fractional damping which is characteristic in different physical situations. The system is studied with a smaller and larger damping parameter value, that we call the underdamped and overdamped regimes. In both we have studied the relation between the fractional parameter, the amplitude of the oscillations and the times to reach the asymptotic behavior, called asymptotic times. In the overdamped regime, the study shows that, also here, there are oscillations for fractional order derivatives and their amplitudes and asymptotic times can suddenly change for small variations of the fractional parameter. In addition, in this latter regime, a resonant-like behavior can take place for suitable values of the parameters of the system. These results are corroborated by calculating the corresponding Q-factor. We expect that these results can be useful for a better understanding of fractional dynamics and its possible applications as in modeling different kind of materials that normally need complicated damping terms
Does Independence Affect Regulatory Performance? The case of national competition authorities in the European Union
No full textDespite having always been assumed to be true, a relationship between the independence of regulatory agencies and their performance has never been formally tested. This paper aims at verifying whether formal regulatory independence affects the performance of national competition authorities in the EU member states. The author presents and discusses a statistical analysis which shows that greater formal independence leads competition authorities to investigate more cases and to issue more decisions
Caterina Colombini (1304 ca.-1387) o della cugina sedotta. Una ‘ricostruzione’ della figura di Caterina attraverso i testi letterari, in Le vestigia dei gesuati. L’eredità culturale del Colombini e dei suoi seguaci, a cura di I. Gagliardi, Firenze, Firenze University Press, 2020, pp. 57-71 ISBN 978-88-5518-227-0
No full textIn this essay the author demonstrates that it is possible to reconstruct the figure of Caterina Colombini (1340?-1387) – Giovanni Colombini's cousin – through a group of texts: the hagiography of Caterina, the letters sent to her by Giovanni Colombini and, finally, Giovanni's biography written by Feo Belcari. The author divides his text into four parts: the first part analyzes the content of Caterina's hagiography; the second examines the linguistic form of the hagiographic text; in the third, the author analyzes the latent meaning of the window, a symbolic place where Giovanni and Caterina converse on divine topics; in the last part, to conclude, the teachings that Giovanni gives to Catherine and her spiritual daughters – the Gesuate – are analyzed
La differenza italiana e l'aporetica del "non"
No full textIn this paper, the author discuss a recent volume on Antonio
Rosmini’s thought, and in particular around the relationship
between Rosmini and Fichte and the notion of nothingness and
nothingness of love
The album of Mattia De Rossi’s drawings. Projects for the Galleria Colonna ai Santi Apostoli
No full textThe study proposed here on Mattia De Rossi, a pupil of Gian Lorenzo Bernini and his most trusted collaborator, is part of an investigation that the author is doing on the figure of the architect, making use of an obvious investigative tool: his drawings.
In particular, the exceptional discovery of a bound volume of about 200 drawings of Mattia is a resource of great effectiveness for the study of his professional figure. Among the sheets of the collection, those relating to the construction site of the Galleria Colonna in the eponymous palace in Piazza SS. Apostoli in Rome, are presented.
These drawings explain the important contribution of Mattia and the creative process that led him to the definitive version of the central hall of the gallery. The drawings are also the only graphic documents related to the project of the Galleria Colonna, now only partially known through hypothetical reconstructions.
The case of the Palazzo Colonna is similar to other projects included in the volume, which enlighten us on De Rossi's career, and which explain his position in several important Roman buildings of the second half of seventeenth centur
A Choreographic Dialogue with Caribbean Poetry: The Sacredness of the Feminine in Walcott's Omeros (1990)
No full textThe aim of this paper is to show how the poetry and art of Caribbean writer Derek Walcott (1930-2017) tends to manifest and substantiate the desirable cultural transformation promoted by the work of the American anthropologist and scholar Riane Eisler. The recognition and the exaltation of symbols connected to the feminine world stand at the core of Walcott’s masterpiece Omeros. In a creative mutual dialogue between different genres and identities, the Caribbean author materialises Eisler’s attempts to forge a type of society based on a new partnership ethic. In a second perspective, this paper analyses how Walcott’s work opens the path to possible creative interdisciplinary approaches in the world of the arts. In my own contribution, as a professional dancer and choreographer, I have tried to “give voice” through movements to some episodes relating to the feminine included in Omeros
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