Search results for " Principi"
showing 10 items of 398 documents
Phenomenological approach to compare the crystallization kinetics of isotactic polypropylene and polyamide-6 under pressure
2001
Reliable experimental data for semicrystalline polymers crystallized under pressure are supplied on the basis of a model experiment in which drastic solidification conditions are applied. The influence of the pressure and cooling rate on some properties, such as the density and microhardness, and on the product morphology, as investigated with wide-angle X-ray scattering (WAXS), is stressed. Results for isotactic polypropylene (iPP) samples display a lower density and a lower microhardness with increasing pressure over a wide range of cooling rates (from 0.01 to 20 °C/s). Polyamide-6 (PA6) samples exhibit the opposite behavior, with the density and microhardness increasing at higher pressur…
Phase separation of polymer blends in solution: A case study
2016
Abstract The phase behavior and phase separation features of the quaternary system poly- l -lactide (PLLA)/poly-rac-lactide (PLA)/dioxane/water were investigated. Experiments were performed with fixed total polymer concentration of 6 wt%, by varying the PLLA/PLA weight ratio. Blend weight compositions examined were 100/0, 80/20, 50/50, 20/80 and 0/100, at fixed dioxane/water weight ratio (87/13). Cloud point measurements reported that the demixing temperatures of blends are close to PLLA in the same mixed solvent, in line with the calculated spinodals. As regards to foam preparation, above the PLA cloud point, morphology is similar to pure PLLA foams; conversely, below PLA cloud point, the …
Papildinātās realitātes spēles mobilām ierīcēm dizaina izstrādes principi
2018
Diplomdarba tēma ir “Papildinātās realitātes spēles mobilām ierīcēm dizaina izstrādes principi”. Darba teorētiskajā daļā tiek apskatīts videospēļu rašanās un dizaina attīstība, spēļu pasaules dizaina veidošanas principi (spēles elementi, mehānika, krāsu izvēle), populārākie un mūsdienu tehnoloģijas, un lietotāja saskarne. Empīriskajā daļā tiek izpētīts spēles “Čūska” dizaina evolūcija, sakot no 1970. gadā veidotiem spēlēm līdz mūsdienīgām. Diplomdarba mērķis ir izpētīt, kādas ir vēsturiskas izmaiņas spēļu dizainā ar tehnoloģijas izmaiņu, ka arī dizaina raksturīgākos spēļu dizaina principus formulēšana. Radošajā daļā tiek izstrādāts dizaina projekts “Papildinātās realitātes spēle “Čūska” diz…
Photoelectrochemical properties of doped lanthanum orthoferrites
2013
Abstract LaFeO 3 powders doped with Sr (20 mol%) and Cu (0-10-20 mol%) were prepared by citrate auto-combustion synthesis and investigated in terms of crystal structure, morphology, surface area and optical properties. All powders showed photocurrent response in the form of a pasted and annealed electrode and as slurry electrode; the highest value was obtained for undoped orthoferrite calcined at 600 °C. Their physical–chemical properties were related to photoelectrochemical behaviour. The position of the quasi-Fermi level of electrons for all the photocatalysts calcined in the range 600–980 °C is about the same within experimental error (between −0.62 and −0.67 V with respect to Ag/AgCl re…
Elemental Bromine Production by TiO2 Photocatalysis and/or Ozonation
2016
Significant production of elemental bromine (Br2 ) was observed for the first time when treating bromide containing solutions at acidic pH, with TiO2 photocatalyst, ozone, or a combination thereof. Br2 selectivities up to approximately 85 % were obtained and the corresponding bromine mass balance values satisfied. The process is general and may be applied at a laboratory scale for green bromination reactions, or industrially as a cheap, safe, and environmentally sustainable alternative to the currently applied bromine production methods.
Characterization of pressure retarded osmosis lab-scale systems
2016
Power generation from salinity gradient is a viable alternative to produce energy from renewable sources. Pressure Retarded Osmosis (PRO) is one of the technologies proposed so far for the exploitation of such energy source. In the present preliminary work, two different geometry modules were tested under atmospheric pressure (i.e. forward osmosis or depressurized-PRO conditions). The first one is a conventional planar geometry cell. The second is a customized cylindrical membrane module, able to mechanically support the osmotic membrane along with the spacers. The latter, thanks to its design, allows membranes and spacers to be easily changed for testing purposes. A novel simplified proced…
LA LEGGE N. 241 DEL 1990 COME PARADIGMA DI RIFERIMENTO: INDAGINE FRA PRINCIPI COSTITUZIONALI, DELL'UNIONE EUROPEA, "LIVELLO LEGISLATIVO", ALLA LUCE D…
2011
Photocatalytic Degradation of Paraquat and Genotoxicity of its Intermediate Products
2007
Abstract The photocatalytic degradation of paraquat (1,1-dimethyl-4,4′-bipyridylium dichloride) aqueous solutions in the presence of polycrystalline TiO2 Degussa P25 irradiated by near-UV light was investigated. The substrate and total organic carbon concentrations were monitored by UV spectroscopy and TOC measurements, respectively: the complete photocatalytic mineralization of paraquat (20 ppm) was achieved after ca. 3 h of irradiation by using 0.4 g l−1 of catalyst amount at natural pH (ca 5.8). On the contrary no significant photodegradation of paraquat was observed in the absence of TiO2 under similar experimental conditions. To evaluate the genotoxicity of paraquat and its intermediat…
ESISTE IL PATERNALISMO PENALE? UN CONTRIBUTO AL DIBATTITO SUI PRINCIPI DI CRIMINALIZZAZIONE
2014
Da tempo si discute se il paternalismo penale costituisca un principio di crimina- lizzazione compatibile con gli assunti di fondo del pensiero liberale. Nell’articolo si sostiene che, in realtà, esso non costituisce un autonomo principio di criminaliz- zazione. Dopo aver distinto tra p. tutorio e p. dispotico, vi si mostra, innanzitutto, come il primo sia manifestazione del principio del danno. Anche il secondo, si sostiene, costituisce un finto avversario per il liberalismo: le incriminazioni che ne costituirebbero espressione o hanno un fondamento moralistico (e andrebbero perciò ‘combattute’ come forme di moralismo giuridico) oppure sviluppano, anche esse, la stessa logica del principio…
Kritiskā domāšana - caurviju prasme kompetencēs balstīta mācību satura īstenošanā sociālajās zinībās 4.klasē
2019
Diplomdarbs “Kritiskā domāšana – caurviju prasme kompetencēs balstīta mācību satura īstenošanā sociālajās zinībās 4. klasē” veltīts kritiskās domāšanas, kā vienas no caurviju prasmēm kompetenču pieejas izglītībā, veicināšanai sociālajās zinībās 4. klasē. Pētījuma mērķis bija, izzinot un analizējot informāciju par kritisko domāšanu, tās pieeju un metodiskajiem paņēmieniem, veikt pētījumu vienā no projekta pilotskolām, kas atspoguļo esošo situāciju, kā arī izstrādāt uzdevumu kopumu sociālajās zinībās 4. klasei. Darba teorētiskajā daļā tika analizēta dažādu autoru zinātniskā, pedagoģiskā, psiholoģiskā literatūra par kompetenču pieejas izglītību, sociālo un pilsonisko jomu, kritiskās domāšanas …