Search results for "HQ"
showing 10 items of 276 documents
Long Range Bond-Bond Correlations in Dense Polymer Solutions
2004
The scaling of the bond-bond correlation function $C(s)$ along linear polymer chains is investigated with respect to the curvilinear distance, $s$, along the flexible chain and the monomer density, $\rho$, via Monte Carlo and molecular dynamics simulations. % Surprisingly, the correlations in dense three dimensional solutions are found to decay with a power law $C(s) \sim s^{-\omega}$ with $\omega=3/2$ and the exponential behavior commonly assumed is clearly ruled out for long chains. % In semidilute solutions, the density dependent scaling of $C(s) \approx g^{-\omega_0} (s/g)^{-\omega}$ with $\omega_0=2-2\nu=0.824$ ($\nu=0.588$ being Flory's exponent) is set by the number of monomers $g(\r…
Chiese colonnari e tiranti metallici (Palermo XVI-XVII secolo)
2014
The churches with aisles of arches and columns are an archetype of Sicilian architecture. From the Middle Ages to the 18th century, the preference for this plan resulted in experiments, evolutions and tests concerned with the science of building in a land exposed to the danger of earthquakes. Contrary to the recommendations dispensed and disseminated by the most authoritative treatises, the cases presented illustrate how metal tie-rods were used at construction sites in Palermo during the Modern Age when building these constructions. These elements were able to counter the thrust generated by the arches and vaults or caused by earthquakes on slender and isolated vertical structures like col…
The Role of Professors in the Formation of Finnish Parliamentary Life: The Struggle between Two Conceptions of Parliament
2017
The Frankfurt Parliament (1848–49) was subsequently dismissively referred to as the “Professors’ Parliament” due to its heavy representation of scholars and the academic style of its lengthy discussions. Professors have played a prominent role in the deliberations and development of other European assemblies, too. This article examines the role of professors in the formation of Finnish parliamentary life. It moreover underlines the close relationship between the academia and national politics in late nineteenth-century Finland, starting from the European revolutions of 1848. The article highlights how politically active professors, together with the newspaper press, were crucial in transfe…
Évaluation de la fluidité de la membrane plasmique avec la sonde fluorescente di-4-ANEPPDHQ: Adaptation de la technique de recouvrement de fluorescen…
2011
National audience; Au cours de l’interaction entre plantes et microorganismes, la membrane plasmique joue un rôle essentiel dans l’organisation précoce des mécanismes de réactions de défense mises en place par la plante. L’équipe Dynamique membranaire et réponse aux stress biotiques, de l’UMR Plante-Microbe-Environnement, s’intéresse aux modifications des propriétés du plasmalemme des cellules végétales dans ce type d’interactions. La fluidité membranaire est une de ces propriétés. La technique de retour de fluorescence après photoblanchiment (FRAP), réalisée à l’aide d’un microscope confocal à balayage laser, a été adaptée à l’étude des variations de la fluidité de la membrane plasmique de…
Common mechanisms underlying membrane modifications induced by protein interactions
2022
Il terremoto del 1823 in Sicilia settentrionale: danni e ricostruzioni
2016
Il 5 marzo 1823 si verificò un terremoto che investì gran parte della Sicilia settentrionale. Numerosi danni si verificarono a Palermo, nelle aree limitrofe a sud e ovest della capitale, in alcuni centri delle Madonie e nelle zone situate lungo il litorale e l’immediato entroterra tirrenico da Palermo a Patti (in particolare a Naso). Il contributo intende indagare, attraverso lo studio delle opere degli autori coevi al sisma e soprattutto di una copiosa documentazione archivistica, le modalità attraverso le quali ci si raffrontò con i problemi determinati dal terremoto, dalla gestione dell'emergenza, all'analisi dei danni e delle successive ricostruzioni. Dal quadro tracciato emerge in part…
Terremoto e architettura storica. Palermo e il sisma del 1726.
2015
On September 1st 1726 Palermo was hit by a violent earthquake. Although it did not bring about the destruction of the city, the earthquake caused widespread and extensive damage to the architectural heritage. The local insti- tutions carried out a series of actions involving representatives of the technical culture. These actions affected the subsequent appearance of the urban pattern and influenced the construction methods of the time. Crossing the data taken from chronicles of the time, from maps produced after the earthquake and above all copious archival documents, the research aims to reconstruct the state in which Palermo was after that tragic event, highlighting a number of aspects. …
Rischi da sisma e uso di tecnologie appropriate per proteggere il patrimonio esistente : Earthquake risks and use of appropriate technologies to prot…
2017
Nel corso degli ultimi anni molti sono stati in Italia i dibattiti scientifici concentrati su una provata relazione tra sisma ed abusi edilizi. Le calamità naturali vengono favorite e/o accentuate dall’uso speculativo e distruttivo dell’ambiente e sono ancora più disastrose per quelle costruzioni che non hanno i dovuti requisiti di sicurezza. Alla luce di queste considerazioni il contributo illustrare parte dei risultati della ricerca dal titolo: “Interazione tra rischio sismico e costruito abusivo. Caratteri morfologici e tipologici nelle aree a rischio sismico”, condotta dall’Università di Palermo in collaborazione con l’Istituto dell’Egeo, il Comune di Kos e l’università di Salonicco, al…
Potres i obnova u Dubrovniku 1520. godine
2015
In 1520 the territory of Ragusa republic was struck by a strong earthquake. According to the documents, all the private houses and also the main religious and public buildings in the city were damaged. The totality of the measures taken from government’s units allow to know the modality of emergency management by a strongly centralized state organization, ensuring at the same time individual freedom and social balance. The effects of earthquake create the necessity of a wide reconstruction work, involving both private and public sphere. The private citizens did mainly emergency interventions, in order to resolve static problems, not taking the opportunity for a restyling of their buildings.…
SUSPENDED TERRITORIES AND WINDOWS OF OPPORTUNITIES AFTER CENTRAL ITALY EARTHQUAKE OF 2016
2019
Nowadays cities are experiencing an unprecedented rate of growth, most of peripheral rural regions are facing shrinking phenomena. While globalization promotes strong economic concentrations in a few urban centers, peripherical regions are negatively affected by decreasing population and impending impoverishment, due to the lack of policy and the failure to develop and maintain rural economies. Although natural disasters accelerate these trends, the shock created by these unexpected events may generate a “window of opportunity”, linked both to risk-reduction processes and to transition paths towards more desirable futures. Earthquakes, more than other natural disasters, destabilize local sy…