395 research outputs found
I miei archivi videoteatrali : Anna Maria Monteverdi intervista Fernando Mastropasqua
No full textIntervista al prof. Mastropasqua in relazione al suo Archivio audiovisivo privato, una fonte inesauribile per ogni ricerca e studio: catalogati in ordine alfabetico (da Antonello Aglioti a Friederich Zelnik), i materiali del suo ricchissimo archivio incrociano teatro, cinema, operetta, varietà, danza attraverso regi-strazioni video e audio, tra vinili audiocassette e dvd, testimoniando le ricerche trasversali di Mastropasqua, tra antropologia, teatro dell’avanguardia e teatro classico; la ricerca tea-trale è testimoniata dal Living, da Carmelo Bene, Luca Ronconi, Peter Brook senza trascu-rare la vasta raccolta di video testimonianze, documentari e interviste. I film ispirati al tea-tro sono quelli di Ernst Lubitsch, di Peter Greenaway fino a Tom Stoppard, Trevor Nunn, Lars von Trier e Kenneth Branag
The interplay of roughness and adhesion in viscoelastic sliding contacts
No full textGarantire un controllo efficace dell'adesione nei materiali viscoelastici rappresenta una sfida cruciale nella tribologia moderna, con implicazioni significative in un ampio spettro di applicazioni ingegneristiche, tra cui mescole per battistrada di pneumatici per una maggiore aderenza ed efficienza, pinze robotiche morbide con adesione reversibile, adesivi strutturali e sensibili alla pressione, sistemi adesivi bio-ispirati e dispositivi MEMS. Nonostante i risultati sperimentali abbiano evidenziato come l'interazione tra l'adesione dell'interfaccia e la viscoelasticità influenzi il comportamento di contatto delle interfacce reali, gli attuali approcci analitici e numerici possono descrivere con precisione solo condizioni senza adesione in presenza di movimento relativo tra solidi o richiedono potenziali interatomici locali ad hoc per imitare gli effetti adesivi. Le osservazioni di fenomeni quali perdite isteretiche, isteresi di adesione e forza adesiva dipendente dalla velocità sottolineano ulteriormente i limiti di questi modelli esistenti, che spesso si basano sulla separazione di scala o ipotizzano un comportamento puramente elastico. Basandosi su un'estensione precedentemente sviluppata del criterio di frattura di Griffith ai materiali isteretici, questa tesi estende ulteriormente il quadro al caso multi-contatto irregolare e lo utilizza per studiare il comportamento di contatto e attrito di diversi profili irregolari multiscala in presenza di adesione interfacciale, attraverso l'intero spettro viscoelastico del materiale. Sfruttando la metodologia degli elementi di contorno basata sull'uso della funzione di Green, le equazioni di chiusura energetica sono state ottenute imponendo, su ciascun bordo di contatto, un equilibrio tra il lavoro delle sollecitazioni interne e quello dell'adesione in presenza di variazioni infinitesimali virtuali del dominio di contatto. Partendo dall'ipotesi di forze adesive a raggio infinitamente corto, l'approccio proposto estende i concetti classici di frattura per tenere conto della dissipazione di energia non conservativa derivante dalle sollecitazioni viscoelastiche. La struttura matematica e fisica di questa formulazione energetica si discosta significativamente dai casi elastici equivalenti, consentendo un trattamento coerente degli effetti di isteresi sia di massa che interfacciali. I risultati mostrano un marcato aumento dell'area di contatto, della forza adesiva e dell'attrito, in particolare a velocità di scorrimento intermedie, determinato dalla coesistenza dell'isteresi di adesione indotta dalla viscoelasticità su piccola scala ai bordi dei contatti e dell'isteresi di massa generata dalla viscoelasticità su larga scala, a conferma dei risultati di precedenti studi simili su un penetratore sinusoidale. Affrontando l'interazione fondamentale tra viscoelasticità, rugosità e adesione, questo lavoro stabilisce una base teorica unificata che spiega le principali osservazioni sperimentali e supporta la progettazione razionale di materiali viscoelastici con proprietà adesive e tribologiche su misura.Ensuring effective control of adhesion in viscoelastic materials represent a crucial challenge in modern tribology, with significant implications across a broad spectrum of engineering applications, including tire tread compounds for enhanced grip and efficiency, soft robotic grippers with reversible adhesion, structural and pressure-sensitive adhesives, bio-inspired adhesive systems and MEMS devices. Despite experimental results have highlighted how the interaction between interface adhesion and viscoelasticity affects the contact behavior of real interfaces, current analytical and numerical approaches can accurately describe only adhesiveless conditions in presence of relative motion between solids or require ad hoc local interatomic potentials to mimic adhesive effects. Observations of phenomena such as hysteretic losses, adhesion hysteresis and velocity-dependent adhesive strength further underline the limitations of these existing models, which often rely on scale separation or assume purely elastic behavior. Building upon a previously developed extension of Griffith’s fracture criterion to hysteretic materials, this thesis further extends the framework to the rough multi-contact case and employs it to investigate the contact and friction behaviour of several multiscale rough profiles in the presence of interface adhesion, across the entire viscoelastic spectrum of the material. Exploiting the boundary element methodology based on the use of the Green's function, the energy closure equations were obtained by imposing, at each contact edge, a balance between the work of internal stresses and that of adhesion under virtual infinitesimal variations of the contact domain. Moving from the assumption of infinitely short-range adhesive forces, the proposed approach extends classical fracture concepts to account for non-conservative energy dissipation arising from viscoelastic stresses. The mathematical and physical structure of this energy formulation significantly departs from equivalent elastic cases, allowing for a consistent treatment of both bulk and interfacial hysteresis effects. The results shows a marked increase in contact area, adhesive strength and friction, particularly at intermediate sliding velocities, driven by the coexistence of adhesion hysteresis induced by small-scale viscoelasticity at the edge of the contacts and bulk hysteresis generated by large-scale viscoelasticity, supporting the findings of previous similar studies for a sinusoidal indenter. By addressing the fundamental interplay between viscoelasticity, roughness and adhesion, this work establishes a unified theoretical foundation that explains key experimental observations and supports the rational design of viscoelastic materials with tailored adhesive and tribological properties
Alberobello
No full textScheda relativa al culto di San Nicola e alle testimonianze storico-artistiche nella città di Alberobell
Adelfia
No full textScheda relativa al culto di San Nicola e alle testimonianze storico-artistiche nella città di Adelfi
Noci
No full textScheda relativa al culto di San Nicola e alle testimonianze storico-artistiche nella città di Noc
Gioia del Colle
No full textScheda relativa al culto di San Nicola e alle testimonianze storico-artistiche nella città di Gioia del Coll
PGC1α: Friend or Foe in Cancer?
No full textThe PGC1 family (Peroxisome proliferator-activated receptor γ (PPAR γ) coactivators) of transcriptional coactivators are considered master regulators of mitochondrial biogenesis and function. The PGC1α isoform is expressed especially in metabolically active tissues, such as the liver, kidneys and brain, and responds to energy-demanding situations. Given the altered and highly adaptable metabolism of tumor cells, it is of interest to investigate PGC1α in cancer. Both high and low levels of PGC1α expression have been reported to be associated with cancer and worse prognosis, and PGC1α has been attributed with oncogenic as well as tumor suppressive features. Early in carcinogenesis PGC1α may be downregulated due to a protective anticancer role, and low levels likely reflect a glycolytic phenotype. We suggest mechanisms of PGC1α downregulation and how these might be connected to the increased cancer risk that obesity is now known to entail. Later in tumor progression PGC1α is often upregulated and is reported to contribute to increased lipid and fatty acid metabolism and/or a tumor cell phenotype with an overall metabolic plasticity that likely supports drug resistance as well as metastasis. We conclude that in cancer PGC1α is neither friend nor foe, but rather the obedient servant reacting to metabolic and environmental cues to benefit the tumor cell
Lissotriton italicus (Peracca, 1893) (Tritone italiano)
No full textExecutive summary
Handbooks for monitoring species and habitats of Community interest (Council Directive
92/43/EEC) in Italy: animal species
The Habitats Directive requires Member States to implement surveillance of the conservation status
of habitats and species of Community Interest. The aim of this handbook is to outline the methodological
instruments for implementing a monitoring program of the Italian animal species, as required by art. 17,
with particular reference to data collection at site level.
The European guidelines require the assessments to be carried out by compiling information on
specific parameters at biogeographical scale. For each animal species, four parameters have to be
considered and combined to obtain an overall assessment of conservation status for each
biogeographical region at national level: "Range" (based on actual distribution), "Population", “Habitat
for the species” and "Future Prospects". Monitoring programs need to collect data dealing with the first
three parameters at a local level.
In this handbook, a monitoring form is presented for each animal taxon (species, subspecies or
species group) of Community interest occurring in Italian terrestrial and inland water environments.
Altogether, the volume contains 151 forms, referring to 215 terrestrial and inland water animal taxa.
Further species, which will be reported in the IV National Report under a common name due to
difficulties in recognizing them in the field or their doubtful status, are mentioned and discussed as well.
Monitoring methods have been defined with the support of five national Scientific Societies, and
reviewed by personnel of the Italian Regions and Autonomous Provinces. The monitoring forms thus
report the most effective available techniques and provide an operational guidance for data collection
and monitoring scheduling with the aim of standardizing data collection efforts across Italy. A
standardized basis of information is indeed important for assembling data at national level and producing
comparable assessments on the conservation status and future prospects of each animal taxon
T-lymphocyte subpopulations at high altitudes. Morococha, Peru - 4560 meters above sea-level.
No full textPutignano
No full textScheda relativa al culto di San Nicola e alle testimonianze storico-artistiche nella città di Putignan
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