1,721,611 research outputs found
Constant-curvature bending response of thin glass: Analytical, numerical and experimental study of “clamp-bending” tests
Full text linkNew generation thin, lightweight and damage-resistant glass, having impressively impact resistance and ability to be bent up to small radii, appears to be the optimal material for extremely deformable structural elements. Its structural use and design require an accurate evaluation of its mechanical properties. However, standard methods to test the glass strength, as the Four-Point Bending and the Coaxial Double Ring test, cannot be used for thin glass, due to its high deformability. Here, an innovative test is proposed, consisting into deforming a thin element into a costant-curvature shape, by prescribing a rotation on two opposite edges of a rectangular plate, while allowing the adjustment of the distance between the supporting hinges. This produces a deformation into an arch of a circle and to a constant stress distribution, allowing to determine the thin glass strength with very simple formulas. An innovative experimental setup, recently proposed for twisting tests on thin glass, has been adapted for constant-curvature bending tests, based on the results of both analytical modelling and numerical analyses. This has been used to perform an experimental campaign, comprising 15 destructive tests on chemically tempered thin glass
Bonvesin da la Riva e l'exemplum i Giobbe
No full textBonvesin da la Riva e le fonti bibliche. In particolare, il volgare O (Vulgare de Passione Sancti Iob), dove l'autore mette in atto una strategia volta a rendere comprensibile e fonte di insegnamento morale e religioso il racconto del libro biblixo di Giobbe, eliminandone le parti più "scandalose" e traendone il tradizionale esempio di "pazienza"
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
L’HISTOIRE DE LA PHARMACIE: RECHERCHE ET ENSEIGNEMENT – FERRARE (ITALIE)
No full textEn Italie, l’Histoire de la Pharmacie est un sujet très négligé dans la recherche et l’enseignement. Depuis l’année 2008, après l’exposition des trésors des bibliothèques de la ville et de l’Université de Ferrare, nous avons commencé à étudier le développement des médicaments à partir de la période de la Renaissance dans la grandeur de la cour des Este jusqu’aux siècles suivants. En outre, nous poursuivons cette recherche afin de découvrir des nouveaux remèdes.
Aujourd’hui, l’enseignement de l’Histoire de la Pharmacie à l’Université de Ferrare, compte finalement 200 élèves qui font partie d’une didactique agréable grâce à l’interaction entre historiens et chercheurs, qui créent ainsi un travail synergique entre la tradition et les nouveaux remèdes. Les chercheurs exploitent comme ressources didactiques les laboratoires historiques - scientifiques suivants: la Pharmacie Navarra-Bragliani du XVIII siècle et la Collection de Chimie pharmaceutique, la Bibliothèque Ariostea et ses précieux livres et le Théâtre Anatomique du 1735, le Musée Anatomique Tumiati du XVIII siècle et la Collection des Sciences Physiques comprenant les instruments physiques et chimiques de Antonio Campana
Progress and challenges of implantable neural interfaces based on nature-derived materials
Full text linkNeural interfaces are bioelectronic devices capable of stimulating a population of neurons or nerve fascicles and recording electrical signals in a specific area. Despite their success in restoring sensory-motor functions in people with disabilities, their long-term exploitation is still limited by poor biocompatibility, mechanical mismatch between the device and neural tissue and the risk of a chronic inflammatory response upon implantation.
In this context, the use of nature-derived materials can help address these issues. Examples of these materials, such as extracellular matrix proteins, peptides, lipids and polysaccharides, have been employed for decades in biomedical science. Their excellent biocompatibility, biodegradability in the absence of toxic compound release, physiochemical properties that are similar to those of human tissues and reduced immunogenicity make them outstanding candidates to improve neural interface biocompatibility and long-term implantation safety. The objective of this review is to highlight progress and challenges concerning the impact of nature-derived materials on neural interface design. The use of these materials as biocompatible coatings and as building blocks of insulation materials for use in implantable neural interfaces is discussed. Moreover, future perspectives are presented to show the increasingly important uses of these materials for neural interface fabrication and their possible use for other applications in the framework of neural engineering
Adolescenti digital natives: l’esperienza soggettiva tra pratiche e appartenenze.
No full textIl presente lavoro affronta le pratiche di comunicazione digitalmente mediata di un gruppo di adolescenti di origine straniera che vivono in una grande città italiana (Milano), in Italia almeno dalla frequentazione della scuola secondaria inferiore. Il campione è composto da 20 soggetti (10 maschi e 10 femmine) di età compresa fra i 15 e i 19 anni, studenti di istituti tecnici. I dati sono stati raccolti attraverso interviste individuali, focus group e la tecnica del virtual shadowing. L'articolo analizza i modelli psicosociali di acculturazione caratteristici di questi giovani transculturali digital natives. In particolare, le dinamiche culturali identitarie vengono collocate all’interno della dimensione transgenerazionale, focalizzando l'attenzione sulle differenze tra nativi e migranti digitali. A tal fine è stata approfondita l'analisi del senso di appartenenza culturale così come viene rappresentata e vissuta attraverso i contesti sociali mediati dalle tecnologie digitali. In conclusione, i differenti piani individuati attraverso cui si sviluppano i processi di definizione identitaria tipici di questi giovani (individuali, sociali, politici, cognitivi, esperienziali, affettivi) sono stati interpretati alla luce delle più recenti teorie psicosociali dell’acculturazione
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