1,720,998 research outputs found
Magnificence of marble. Bartolomé Ordóñez and Diego de Silóe ; sculpture of the Renaissance in Naples.
No full textIn only a few years, between 1513 and 1518, Bartolomé Ordóñez and de Siloe transformed Naples into one of the great European capitals of sculpture, bringing the treatment of marble into an unprecedented flower. The aristocracy considered Carrara marble, long-lasting and evocative of a Classical past, the material best suited to represent their ‘magnificence’.
Ordóñez and de Siloe developed their art between Florence and Rome, in contact with Donatello, Michelangelo, Andrea Sansovino and Raphael. The two ‘eagles’ from Burgos created a particularly expressive style, in which the influence of models from the Italian Renaissance fused with that of Antiquity.
The works of these two great sculptors were to prove decisive in the dissemination of the Renaissance in Spain
Integrazioni documentarie per il giovane Andrea da Salerno. I polittici di San Valentino Torio e di Buccino
No full textRecensioni, interventi, questioni di metodo. Scritti da quotidiani e periodici 1962-1988
No full textDipartimento di Discipline storiche “Ettore Lepore” dell’Università degli Studi di Napoli Federico II, del Dipartimento di Filosofia e Politica dell’Istituto Universitario Orientale di Napoli, del Dipartimento di Studio delle Componenti Culturali, Umane e Relazionali del Territorio della Seconda Università di Napoli
Experimental analysis of a pulse tube based new prototype for cells cryopreservation
No full textCells cryopreservation is crucial for the treatment of several diseases, but the survival rate of the cells is significantly affected by the cooling process. Currently, programmable freezers based on liquid nitrogen technology are usually adopted but these solutions may cause the death of the cells due to undesired crystallization, membrane damage or osmotic shock. In the recent years, pulse tube refrigerators have attracted a lot of interest in many applications because of their intrinsic characteristics. Despite more gradual, the cooling rate of a similar refrigerator needs to be carefully controlled to meet the desired requirements of cells cryopreservation. Therefore, at the premises of Sapienza University of Rome a pulse tube-based prototype has been designed for cells cryopreservation and an experimental tests campaign has been conducted to assess the performance of the system for the scope. A new control logic, able to adjust the supplied voltage to electric heaters for the conditioning of the temperature inside the stand tubes, has been implemented and different configurations evaluated with cooling rate varying in the range 0.5°C/min to 1.5°C/min. The analysis has shown that the proposed control logic is able to cool down the stem cells in all the investigated range with a maximum temperature difference between the mean temperature of the tubes and the theoretical temperature of −7.65°C for the configuration with copper plate and −4.09°C for the configuration with aluminium plate which represents a safe condition. On the contrary, the copper plate allows approximating better the real cooling curve with the theoretical one and achieving a lower temperature variance at cooling rates higher than 1.25°C/min. Although some further efforts are needed to tune the system up, the present work has demonstrated that a pulse tube refrigerator can be technically and commercially adopted as a viable solution for stem cells cryopreservation
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
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
Robust motion control of aerial manipulators
Full text linkAerial manipulators are composed of a robotic arm installed on an unmanned aerial vehicle and are used in several applications because of their inherent ability in performing complex tasks. In real-world applications, these systems are required to be robust against exogenous disturbances, such as wind, to guarantee the desired level of accuracy in the execution of the tasks. In this paper, the reference scenario consists of an aerial manipulator with a camera mounted on the end-effector of the robotic arm, and the goal is to track a fast-moving target. A control system architecture able to assure that the tracking error remains bounded even in the presence of external disturbances is illustrated. The proposed approach is based on the compensation of the dynamic coupling between the robotic arm and the unmanned aerial vehicle. Stability is analytically proved, and the effectiveness of the proposed control solution is shown with some simulations
Design and validation of an attitude and heading reference system for an aerial robot prototype
No full textIn this paper we consider the design and the experimental validation of an attitude and heading reference system for a miniature aerial robot prototype based on measurements obtained from a low cost off-the-shelf inertial measurement unit. Different estimation algorithms to process the raw inertial data are implemented and validated in real indoor flight tests by employing, as a reference, the accurate attitude estimation obtained from a vision based motion tracking system. The proposed experiments allow to accurately evaluate the performance of the different estimation algorithms and the effects of disturbances, such as vehicle accelerations, vibrations and non ideal magnetic fields, in a typical scenario of application for the considered unmanned vehicle prototype
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
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