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51.
Ilaria Menapace Eyad Masad Georgios Papavassiliou Emad Kassem 《International Journal of Pavement Engineering》2016,17(10):847-860
This paper introduces an innovative methodology for estimating the ageing of asphalt concrete cores without extracting the binder. Asphalt concrete samples at different ageing stages (unaged, 3-month and 6-month aged) and with different percent air voids (4%, 7% and 10%) were analysed with low-field nuclear magnetic resonance (NMR). The transverse relaxation time T2 and relative hydrogen index (RHI) obtained from NMR measurements were related to the viscosity of the asphalt binder. The samples were analysed during cooling from 70°C to room temperature, showing increase in viscosity with decreasing temperature. There was a clear trend indicating higher viscosities in samples that were aged for a longer period and samples with higher percent air voids. The RHI and T2 values obtained from low-field NMR measurements and the viscosity data calculated from measurements using a dynamic shear rheometer were correlated to develop a model that relates viscosity with RHI. 相似文献
52.
Ilaria Fratoddi Giuseppe Marghella Iole Venditti Daniela Ferro Maria Vittoria Russo 《应用聚合物科学杂志》2013,128(1):304-309
In this work, the use of a film of an organometallic polymer, namely Pt‐DEBP, has been tested for the selective capture of sulfides with the aim of protecting silver object. Ag foils were exposed to different environmental conditions in the presence of Pt‐DEBP films. Scanning electron microscopy, energy dispersive spectrometry, and colorimetric studies allowed to assess that the polymeric layer selectively captures H2S, preventing the tarnishing of the silver substrate over a period at least of 2 months, without any manipulation of the sample. This approach open new perspectives for the prevention of aging effects on silver objects of artistic interest, for which cleaning or coating procedures should be avoid. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 相似文献
53.
Ilaria Adamo Valeria Diella Alessandro Pavese Pietro Vignola Fernando Francescon 《Journal of the European Ceramic Society》2013,33(15-16):3387-3395
The system Na-feldspar (F) and kaolinite (K) was investigated at temperatures of interest in ceramic applications (1200–1280 °C) to study the effects of F/K ratios by weight and crystallinity degree of kaolinite on the final product, micro-structural features and mullite-glass Gibbs energy of formation (ΔGeff). Mullite and glass are the dominant phases; in general, the higher the temperature, the larger the former. An F/K increase promotes the formation of glass and secondary mullite, appearing along with the primary one. ΔGeff was modelled by α(T) × (F/K)2 + β(T) × F/K + γ(T), α, β and γ being linear functions of temperature whose coefficients were determined by fitting the ΔGeff-theoretical to the ΔGeff-obtained from the measured phase compositions. ΔGeff is less affected by temperature than by F/K, whose increase shifts equilibrium towards glass phases. The ΔGeff-curves for ordered and disordered kaolinite intersect one another at F/K ~0.5, a ratio close to that used in industrial practice. 相似文献
54.
According to the Linear Elastic Fracture Mechanics criteria, a numerical model is developed to simulate the failure evolution
of multi-cracked finite plates by means of an incremental loading procedure. A modified crack length control scheme is used
in order to analyse such problems depending on one or more independent parameters. The aim is to provide information about
a discontinuous response, such as the snap-back instability, which can be highlighted only by a deformation controlled process.
The load vs. displacement curve, included possible snap-back branches, is numerically traced by means of a procedure based
on the Displacement Discontinuity Boundary Element Method. With reference to finite plates with ordered crack distributions
in plane strain loading conditions, the model is applied in order to analyse the effects of the crack interaction on the fracture
evolution.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
55.
Complex Price Dynamics in a Financial Market with Imitation 总被引:1,自引:0,他引:1
In this work a simple financial model with fundamentalists and imitators is being considered. In order to describe the price dynamics of the heterogeneous stock market, a synergetic approach is used and some global bifurcations arising in the model are being studied. It is shown that the fundamental equilibrium point P* may be destabilized through a subcritical Neimark–Sacker bifurcation and that two invariant closed curves, one attracting and one repelling, appear when P* is still stable. This particular bifurcation scenario allows us to show some noticeable features of the market that emerge when the imitation effect is emphasized. Among these features are, for instance, the volatility clusters associated with the presence of multistability (i.e. coexistence of attractors) and the hysteresis phenomenon. 相似文献
56.
Ionic liquids as diathermic fluids for solar trough collectors’ technology: A corrosion study 总被引:1,自引:0,他引:1
Ilaria Perissi Ugo Bardi Stefano Caporali Alessio Fossati Alessandro Lavacchi 《Solar Energy Materials & Solar Cells》2008,92(4):510-517
The AISI 304 and AISI 1018 steels (frequently used in solar collectors’ plants) in contact with four different ionic liquids (ILs) suitable as diathermic fluids, were studied. Immersion tests were performed at 220 °C (the working temperature in such plants) for 10 days. The corrosion morphologies of the steels were investigated by scanning electron microscopy coupled with energy dispersive X-ray (EDX) microanalysis and the content of metals in the solution were detected via ICP-OES. The tests showed that the most performing IL is the ethyl-dimethyl-propyl-ammonium-bis(trifluoromethylsulphonyl)imide. The corrosion properties of the two alloys in contact with such IL were investigated by means of Tafel plots and resistance polarization at room temperature in open-to-air vessels. 相似文献
57.
E. Zanotti M. Bisenberger R. Hertenberger H. Kader G. Graw 《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》1991,310(3):706-707
A light ion detector of 1.7 m active length, appropriate for the use within the vacuum vessel of the Q3D magnetic spectrograph, is described. 相似文献
58.
Ilaria Massarelli Laura Murgia Anna Maria Bianucci Federica Chiellini Emo Chiellini 《International journal of molecular sciences》2007,8(1):13-28
A practical approach for addressing the computer simulation of protein-carbohydrate interactions is described here. An articulated computational protocol was set up and validated by checking its ability to predict experimental data, available in the literature, and concerning the selectivity shown by the Carbohydrate Recognition Domain (CRD) of the human asialoglycoprotein receptor (ASGP-R) toward Gal-type ligands. Some required features responsible for the interactions were identified. Subsequently the same protocol was applied to monomer sugar molecules that constitute the building blocks for alginates and ulvans. Such sugar polymers may supply a low-cost source of rare sugars with a potential impact on several industrial applications, from pharmaceutical to fine chemical industry. An example of their applicative exploitation could be given by their use in developing biomaterial with adhesion properties toward hepatocytes, through interaction with the ASGP-R. Such a receptor has been already proposed as a target for exogenous molecules, specifically in the case of hepatocytes, for diagnostic and therapeutic purposes. The DOCK5.2 program was used to search optimal locations of the above ligands of interest into CRD binding site and to roughly estimate interaction energies. Finally, the binding ΔG of theoretical protein-ligand complexes was estimated by using the DelPhi program in which the solvation free energy is accounted for with a continuum solvent model, by solving the Poisson-Boltzmann equation. The structure analysis of the obtained complexes and their ΔG values suggest that one of the sugar monomers of interest shows the desired characteristics. 相似文献
59.
Nuria Burgos Ilaria Armentano Elena Fortunati Franco Dominici Francesca Luzi Stefano Fiori Francesco Cristofaro Livia Visai Alfonso Jiménez José M. Kenny 《Food and Bioprocess Technology》2017,10(4):770-780
Fully bio-based and biodegradable active films based on poly(lactic acid) (PLA) blended with poly(3-hydroxybutyrate) (PHB) and incorporating lactic acid oligomers (OLA) as plasticizers and carvacrol as active agent were extruded and fully characterized in their functional properties for antimicrobial active packaging. PLA_PHB films showed good barrier to water vapor, while the resistance to oxygen diffusion decreased with the addition of OLA and carvacrol. Their overall migration in aqueous food simulant was determined and no significant changes were observed by the addition of carvacrol and OLA to the PLA_PHB formulations. However, the effect of both additives in fatty food simulant can be considered a positive feature for the potential protection of foodstuff with high fat content. Moreover, the antioxidant and antimicrobial activities of the proposed formulations increased by the presence of carvacrol, with enhanced activity against Staphylococcus aureus if compared to Escherichia coli at short and long incubation times. These results underlined the specific antimicrobial properties of these bio-films suggesting their applicability in active food packaging. 相似文献
60.
Protocatechuic acid activates key components of insulin signaling pathway mimicking insulin activity
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