Search results for "Principi"
showing 10 items of 580 documents
Kinetics of 4-Methoxybenzyl Alcohol Oxidation in Aqueous Solution in a Fixed Bed Photocatalytic Reactor
2010
WOS: 000280384800004
Polymeric scaffolds based on blends of poly-l-lactic acid (PLLA) with poly-d-l- lactic acid (PLA) prepared via thermally induced phase separation (TI…
2012
Porous scaffolds based on blends of high crystalline Poly-L-lactic acid (PLLA) with low crystalline poly-D-L-lactic acid (PLA) were prepared via Ther- mally Induced Phase Separation (TIPS), with the aim of exploring the possibility to control the degradation behaviour of the PLA-based scaffold, simultaneously pre- serving the morphological characteristics required for tissue engineering applica- tions. Porous foams with different PLLA/PLA weight ratios (from 95/5 to 60/40) were produced and characterised in terms of pore size, porosity, and thermal properties. The scaffolds present an open porosity, with average pore sizes ranging from 30 to 70 lm. Results showed that, when dealing with a P…
On the calculation of free energy of mixing for aqueous polymer solutions with group-contribution models
2010
Abstract Liquid–liquid phase separation processes are currently used as a route to prepare polymeric porous structures for various applications (membranes and scaffolds for tissue engineering). In membrane and foam fabrication technologies, binary and mainly ternary polymer solutions are used. Membrane morphology is strongly affected by phase equilibria of processing solution. In order to achieve a better control of membrane morphology and to explore a wide quantity of solvents, a predictive tool addressing experimentals would be strongly advisable. In this paper, group contribution models were chosen to test the applicability on a PLLA–dioxane–water ternary polymer solution, whose experime…
Photocatalytic oxidation of trans-ferulic acid to vanillin on TiO2 and WO3-loaded TiO2 catalysts
2015
Abstract The photocatalytic oxidation of trans-ferulic acid to vanillin in water has been studied by using various TiO2 and WO3-loaded TiO2 samples as catalysts. Different values of selectivity were obtained depending on the physico-chemical properties of the single samples and a vanillin selectivity of 10% was reached in the presence of the commercial TiO2 Merck. Higher selectivity values were obtained by impregnation of TiO2 with H2WO4 followed by calcination. The increased production of vanillin exhibited by the obtained WO3-loaded TiO2 powders was attributed to a reduced further oxidation of the aldehyde caused by the presence of the practically inactive tungsten trioxide hydrate on the…
No-Flow Temperature in Injection Molding Simulation
2010
Most injection molding simulation packages use the no-flow temperature (NFT) as a means of determining whether the polymer flows or is solid. The NFT is not well defined, and a standard method for measuring it does not exist. A sensitivity analysis of the filling stage has been carried out with two different packages [VISI Flow (Vero Software Limited, Gloucestershire, UK) and Moldflow (Autodesk, Inc., San Rafael, CA)] to estimate the influence of the NFT on the main processing parameters. The NFT has a large influence on the thickness of the frozen layer, but it does not appreciably affect the filling pressure. Because the NFT affects the frozen layer, an effect on the estimation of shrinka…
The use of master curves to describe the simultaneous effect of cooling rate and pressure on polymer crystallization
2003
In a previous work a master-curve approach was applied to experimental density data to explain isotactic polypropylene (iPP) behaviour under pressure and high cooling rates. Suitable samples were prepared by solidification from the melt under various cooling rate and pressure conditions with the help of a special apparatus based on a modified injection moulding machine. The approach here reported is more general than the case study previously shown, and is suitable to be applied to several materials and for different measures related to crystalline content. The proposed simple model is able to predict successfully the final polymer properties (density, micro-hardness, crystallinity) by supe…
Cilvēka cieņas kā vispārējā tiesību principa piemērošanas metodoloģija Satversmes tiesas procesā
2022
Bakalaura darba nosaukums: “Cilvēka cieņa kā vispārējā tiesību principa piemērošanas metodoloģija Satversmes tiesas procesā”. Bakalaura mērķis ir: aplūkot cilvēka cieņu kā vispārējo tiesību principu un kā tā tiek piemērota Satversmes tiesā. Galvenais secinājums, kas izdarīts darba ietvaros, ka clvēka cieņa, balstoties uz tās saistību ar pamatnormu, proti, to, ka tā izreit no pamatnormas, kā arī to, ka pēc sava satura tā izteic Latvijas tiesiskās sistēmas augstāko vērtību - cilvēku - tā ir uzskatāma par vispārējo tiesību principu, kā arī Cilvēka cieņa kā vispārējs tiesību princips kalpo tikai par ārējā normatīvā tiesību akta materiālās satversmības pārbaudes mērauklu, jo cilvēka cieņa nenosa…
Concorso apparente di reati e istanze di ne bis in idem sostanziale
2022
In questo volume si analizzano le implicazioni sulla questione del concorso apparente di reati, delle decisioni degli ultimi anni della Corte EDU e della Corte di Giustizia dell’UE, relative al principio di ne bis in idem tra illeciti (sostanzialmente) penali (pur se formalmente amministrativi). In tal senso, nel primo capitolo ci si sofferma sul problema della distinzione tra concorso formale e apparente di reati dal codice Zanardelli a oggi. Nel secondo capitolo si esamina la giurisprudenza assai copiosa delle Sezioni Unite della Cassazione sul concorso apparente di reati, sia nelle enunciazioni teoriche sia nelle scelte concrete, per verificare quali criteri, al di là delle affermazioni …
El beneficiario en el contrato a favor de tercero
2022
La noción de contrato a favor de tercero, clásica en la doctrina civilista moderna, presenta la extraña característica de resultar aparentemente clara por su enunciado y, a la vez, tendente a tornarse huidiza y esfumarse. La mayoría de la doctrina que estudia la figura analizada, reconoce como contrato a favor de tercero aquel concertado por las partes del mismo, en interés directo o indirecto de un tercero que, pese a no intervenir en modo alguno en la formación de este, le es atribuido un derecho subjetivo tendente a exigir su cumplimiento. La existencia de las partes contractuales y de un tercero beneficiario condiciona un conjunto de relaciones internas que remarcan la complejidad del i…
La sorte dei contratti dei calciatori professionisti nell’emergenza Covid-19
2020
The essay focuses on the impact generated by the spread of the Coronavirus (COVID-19) and by the subsequent numerous regulatory actions. It takles the world of sports and the football players’ contracts in relation to the global pandemic. It analyses all the different Italian Governament decrees enacted in order to regulate sports matters, stressing their effects. The author exam- ines the civil aspects concerning the modi cation or the interruption of ser- vices due under the contract by the player and by the sports society.