120,522 research outputs found
Trasformazioni urbane tra criticità irrisolte e sfide moderne
No full textAncora una volta una riflessione sulla città è al centro dell’attenzione di tanti studiosi. Come potrebbe essere diversamente? Oggetto di studio così importante, così mutevole e così determinante per la vita degli esseri umani, la città è un organismo in continua trasformazione: da sempre si discute della sua nascita e della sua evoluzione nei vari periodi storici, ponendo enfasi sull’urbanizzazione, sulla sua crescita e sul suo sviluppo, sulla memoria e sulle tracce di umanità e di cultura che in essa possono scorgersi. Le città sono tutte diverse, ma se prendiamo in considerazione solo una di queste, sarà percepita in modo diverso da ciascuno dei suoi fruitori. Esiste quella ideale, ovvero la migliore tra le città? La felicità dipende sempre dal reddito? Quali indicatori possono assicurare che una determinata città sia ideale e garantisca condizioni di vivibilità oppure quali aspetti la rendono invivibile e hanno l’effetto di lanciare un allarme verso chi le abita e le amministra? Queste apparentemente banali domande richiedono in verità risposte articolate, sia perché ci riferiamo ad un ambito contraddistinto da asimmetrie informative, sia perché entrano appunto in gioco le plurime visioni degli individui.Once again a reflection on the city is at the center of the attention of many scholars. How could it be otherwise? An object of study so important, so changeable and so decisive for the life of human beings, the city is an organism in continuous transformation: its birth and its evolution in various historical periods have always been discussed, placing emphasis on urbanization, its growth and development, on memory and on the traces of humanity and culture that can be seen in it. Cities are all different, but if we consider just one of them, it will be perceived differently by each of its users. Is there the ideal one, that is the best of the cities? Does happiness always depend on income? What indicators can ensure that a certain city is ideal and guarantee conditions of livability or what aspects make it unlivable and have the effect of sounding an alarm to those who live and manage them? These apparently banal questions actually require articulated answers, both because we are referring to an area characterized by information asymmetries, and because the multiple visions of individuals come into play
Dal Comune alla Repubblica: annotazioni sull'evoluzione del diritto statutario genovese in Età moderna
No full textIl saggio tratta dell'evoluzione del diritto statutario genovese evidenziando il passaggio nel Cinquecento da un ordinamento di tipo ancora cittadino ad una Repubblica regionale. Si analizzano in particolare il processo di revisione legislativa degli statuti quattrocenteschi, le influenze esterne e le trasformazioni sociali che hanno modellato la legislazione genovese dalla riforma istituzionale del 1528 agli ultuimi anni dell'Antico regime
Reversible photoswitching of dye-doped core-shell nanoparticles
No full textGenovese D, Montalti M, Prodi L, et al. Reversible photoswitching of dye-doped core-shell nanoparticles. Chemical Communications. 2011;47(39): 10975.We present a simple and versatile mechanism for the reversible photoswitching of dye-doped core-shell nanoparticles. Photochromic dithienylethenes are incorporated into the outer shell, close enough to the dyes entrapped in the core to efficiently quench them by energy transfer when photoconverted with UV light. The emission can be switched back on by irradiation with lambda > 450 nm
Novel Insulating Material from renewable resources
No full textSilicate-Lignin Foam Composites as eco-friendly insulating materials
Silvia Bordoni, Inorganic and Physical Chemistry Dept, University of Bologna
Laura Genovese, ICIE Architecture Lab for technology transfer in Constructions, Bologna
Organic-inorganic composite materials have been extensively studied for a long time, since they combine advantages of the inorganic material (i.e. rigidity, thermal stability) and of the organic phase, which is, in most of cases, a polymer (i.e. flexibility, ductility and processability (1).
Among several organic/inorganic hybrid materials, the polymer/silica nano- and meso-composites are the most commonly reported in literature and have attracted both academic and industrial interests. Besides the common applications, including coating, catalysts, devices and sensors, this type of composites can be also employed to realize innovative construction materials (2).
Here we report a formulation from renewable sources of a novel thermal- insulating material, able to offer an eco-friendly alternative to the conventional light-weighed synthetic products. The designed material is an organic-inorganic composite of lignosulfonate, as the main waste product of cellulose-production, dispersed into a silicate matrix with the addition of non-food corn starch, acting as gluing agent. The further addition of esterification promoters, foaming and coupling agents, polyol acids as pH-regulators, fungi preservatives and Kenaf fibers as reinforcing agents, confers the tailored targeted features. Addition of a suitable coupling agent (APTES) promotes linkage between the polyol groups of glycerol or the surfactant lignosulfonate with silanol and siloxane moieties of the silicate substrate. The resulting blended biopolymers-microporous silica material (40m) appears as a single phase rigid foam, which conjugates low-density (0.25-0.35g/cm3), low conductivity (λ= 0.02-0.05 W/m2K) and acceptable mechanical properties (3). These features make the composite useful for bored-brick filler or as small insulating panels in building applications. Recent efforts to reduce hydrophilicity and then biodegradability by starch acetylation and to introduce benign polycarboxylic acids as alternative expanding promoters, more efficient plasticizers or foam stabilizers and rheology modifiers, will be also presented.
1. H.Zou, S. Wu, J.Shen; Chem. Rev. 2008, 108, 3893-3957
2. Common Strategic Framework for Research and Innovation ,“Horizon 2020”.
3. S. Bordoni; An eco-friendly challenge; Festival della scienza, Genova, 2011
University of Bologna
Laura Genovese, ICIE Architecture Lab for technology transfer in Constructions, Bologna
Organic-inorganic composite materials have been extensively studied for a long time, since they combine advantages of the inorganic material (i.e. rigidity, thermal stability) and of the organic phase, which is, in most of cases, a polymer (i.e. flexibility, ductility and processability (1).
Among several organic/inorganic hybrid materials, the polymer/silica nano- and meso-composites are the most commonly reported in literature and have attracted both academic and industrial interests. Besides the common applications, including coating, catalysts, devices and sensors, this type of composites can be also employed to realize innovative construction materials (2).
Here we report a formulation from renewable sources of a novel thermal- insulating material, able to offer an eco-friendly alternative to the conventional light-weighed synthetic products. The designed material is an organic-inorganic composite of lignosulfonate, as the main waste product of cellulose-production, dispersed into a silicate matrix with the addition of non-food corn starch, acting as gluing agent. The further addition of esterification promoters, foaming and coupling agents, polyol acids as pH-regulators, fungi preservatives and Kenaf fibers as reinforcing agents, confers the tailored targeted features. Addition of a suitable coupling agent (APTES) promotes linkage between the polyol groups of glycerol or the surfactant lignosulfonate with silanol and siloxane moieties of the silicate substrate. The resulting blended biopolymers-microporous silica material (40m) appears as a single phase rigid foam, which conjugates low-density (0.25-0.35g/cm3), low conductivity (λ= 0.02-0.05 W/m2K) and acceptable mechanical properties (3). These features make the composite useful for bored-brick filler or as small insulating panels in building applications. Recent efforts to reduce hydrophilicity and then biodegradability by starch acetylation and to introduce benign polycarboxylic acids as alternative expanding promoters, more efficient plasticizers or foam stabilizers and rheology modifiers, will be also presented.
1. H.Zou, S. Wu, J.Shen; Chem. Rev. 2008, 108, 3893-3957
2. Common Strategic Framework for Research and Innovation ,“Horizon 2020”.
3. S. Bordoni; An eco-friendly challenge; Festival della scienza, Genova, 201
La conciliazione in sanità
No full textAd alcuni mesi dall'entrata in vigore, la obbligatorietà della Conciliazione in Sanità non è ancora del tutto nota ai suoi addetti ai lavori. Dal punto di vista concettuale, si tratta di un provvedimento interessante, che raccoglie un'esigenza in Sanità, vale a dire quella di mettere a confronto il Sanitario che forse ha sbagliato e il paziente che ritiene di aver subito un danno. Si tratta, pertanto, di una soluzione più volte auspicata e che potrebbe condurre ad un'utile interazione tra le parti, anche se non sono da sottacere perplessità, soprattutto di carattere pratico-attuativo. E' difficile, infatti, allo stato pensare che nei casi di responsabilità professionale articolata si possano efficacemente raggiungere, nei tempi fissati e con i mezzi che si hanno a disposizione, soluzioni definitive
Long Time Behaviour of a Local Perturbation in the Isotropic XY Chain Under Periodic Forcing
No full textWe study the isotropic XY quantum spin chain with a time-periodic transverse magnetic field acting on a single site. The asymptotic dynamics is described by a highly resonant Floquet–Schrödinger equation, for which we show the existence of a periodic solution if the forcing frequency is away from a discrete set of resonances. This in turn implies the state of the quantum spin chain to be asymptotically a periodic function synchronised with the forcing, also at arbitrarily low non-resonant frequencies. The behaviour at the resonances remains a challenging open problem
Presunta malpractice : casistica settoria dell' Istituto di Medicina Legale di Milano (2002-2006)
No full textLa curiosità sollevata da dati e statistiche relativa alla malpractice in Sanità ha indotto ad eseguire una disamina dei casi autoptici di sospetta responsabilità professionale giunti all’osservazione presso la sala anatomica dell’Istituto di Medicina Legale di Milano nel periodo 2002-2006, che condotto a risultante non in linea con quanto diffuso dai mass media
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