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Sodium depth profiles were determined in water-leached glass samples with molar composition 20Na2 O · 10RO · x Al2 O3 · (70 - x)SiO2 (RO = CaO, MgO, and ZnO) using secondary ion mass spectrometry. The leaching of sodium ions decreases with increasing Al2 O3 content in all three glass systems. For x = 0 the leaching is hardly affected by the nature of the divalent cation. For x = 5 and 10 the corrosion resistance is highest for the glass containing ZnO, and for the glasses containing ZnO and MgO, respectively. These glasses correspond to those with the smallest fraction of NBOs. From all these results it is concluded that the nonbridging oxygen atoms play an important role in promoting the leaching of a glass. 相似文献
3.
L BRUNO CHANDRASEKAR K GNANASEKAR M KARUNAKARAN R CHANDRAMOHAN 《Bulletin of Materials Science》2016,39(6):1435-1440
The effect of ‘Al’ concentration on spin-dependent tunnelling in strained non-magnetic symmetric double-barrier semiconductor has been theoretically investigated. The separation between spin-up and spin-down components, barrier transparency, polarization efficiency and tunnelling lifetime were calculated using the transfer matrix approach. The separation between spin-up and spin-down resonances and tunnelling lifetime were reported for the first time in the case of InAs/Ga1?y Al y As heterostructures for various ‘Al’ concentrations and for various barrier widths. Cent percentage polarization can be obtained in this strained non-magnetic double-barrier semiconductor even without any external field. 相似文献
4.
MARIA PIA FANTI BRUNO MAIONE BIAGIO TURCHIANO 《International journal of control》2013,86(6):2523-2542
Linear positive systems are utilized in various scientific areas such as economic modelling, behavioural science, stochastic processes etc. A recent study has focused on some sufficient conditions for the controllability of these systems. A full characterization is provided of the controllability for discrete-time single-input positive systems. Necessary and sufficient conditions are derived using a digraph-theoretic approach. The main results show that strong constraints are to be imposed on the digraph associated with the pair (A, b) to ensure the controllability of the system. 相似文献
5.
DOMENICO GABRIELE STEFANO CURCIO MASSIMO MIGLIORI BRUNO DE CINDIO 《Journal of food process engineering》2004,27(6):464-475
The rheological behavior of liquorice solutions at different concentrations (ranging between 30 and 60 Brix) and temperatures (in the range between 25 and 80C) has been investigated performing both dynamic tests in the linear viscoelastic region and steady shear tests, in 0.1–100 s?1 shear rate range, by using a stress controlled rheometer (DSR 200, Rheometric Scientific, USA) and parallel plate geometry (φ = 40 mm). Small amplitude oscillations has shown the presence of both moduli also at the lowest tested concentration, with G′ greater than G″, except for the 30 Brix sample. It has been found that experimental viscosity data show a good agreement with a power law model, thus allowing the estimation of both the friction factor and the pressure drops in a typical pipeline used for liquorice solution conveying. It has been observed that the assumption of Newtonian behavior can lead to the erroneous design of the apparatuses that have to process liquorice extracts. 相似文献
6.
We studied oxidative changes of ground pork meat filled into plastic or aluminum trays, sterilized at 121 or 131°C and stored up to 56 days at 20 or 37°C in the dark or exposed to light, respectively. Sterilization temperature did not influence either thiobarbituric acid reactive substances (TBARS) of the samples or ethane concentrations in headspace of trays. An increase of storage temperature from 20 to 37°C increased TBARS and ethane concentrations regardless of filling method and packaging material. No changes in double-bond indices were observed. Nitrogen flushing in combination with light protection reduced lipid oxidation up to 85–95% 相似文献
7.
FRANCALANZAL ABBONDANNO U AMORINI F BARLINI S BINI M BOUGAULT R BRUNO M CARDELLA G CASINI G AGOSTINO M D' De FILIPPO V De SANCTIS j GERACI E GIUSSANI A GRAMEGNA F GUIOT B KRAVCHUK V La GUIDARA E LANZALONE G 《核技术(英文版)》2013,(5):82-88
The experimental data concerning the 58Ni+48Ca reaction at Elab(Ni)=25A MeV, collected by using the CHIMERA 4n device, have been analyzed in order to investigate the competition among different reaction mechanisms for central collisions in the Fermi energy domain. As a main criterion for centrality selection we have chosen the flow angle (Snow) method, making an event-by-event analysis that considers the shape of events, as it is determined by the eigenvectors of the experimental kinetic-energy tensor. For the selected central events (8~ow〉60~) some global variables, good to characterize the pattern of central collisions have been constructed. The main features of the reaction products were explored by using different constraints on some of the relevant observables, like mass and velocity distributions and their correlations. Much emphasis was devoted, for central collisions, to the competition between fusion-evaporation processes with subsequent identification of a heavy residue and a possible multifragmentation mechanism of a well defined (if any) transient nuclear system. Dynamical evolution of the system and pre-equilibrium emission were taken into account by simulating the reactions in the framework of transport theories. Different approaches have been envisaged (dynamical stochastic BNV calculations + sequential SIMON code, QMD, CoMD, etc.). Preliminary comparison of the experimental data with BNV calculations shows reasonable agreement with the assumption of sequential multifragmentation emission in the mass region of IMFs close to the heavy residues. Possible deviations from sequential processes were found for those IMFs in the region of masses intermediate between the mass of heavy residues and the mass of light IMFs. Further simulations are in progress. The experimental analysis will be enriched also by information obtained inspecting the IMF-IMF correlation function, in order to elucidated the nature of space-time decay property of the emitting source associated with events having the largest IMF multiplicity. 相似文献
8.
An apparatus for absolute thermal expansion measurements has been developed and operated to 2843°C. Thermal expansion characteristics have been measured for niobium carbide, zirconium carbide, tantalum carbide, and the carbide solutions 8TaC·ZrC, 4TaC·ZrC, TaC·ZrC, and TaC·4ZrC. Supporting evidence for a high temperature inversion in the monocarbides of zirconium and tantalum has been observed. Evidence of analogous behavior for other carbides is also reported. 相似文献
9.
MARIA PIA FANTI BRUNO MAIONE BIAGIO TURCHIANO 《International journal of control》2013,86(5):1947-1965
A full characterization of structurally fixed modes for systems described by Rosenbrock's polynomial matrices is given. The constraints imposed on the feedback structure are quite general, so that the decentralized-control problem can be viewed as a particular case. The results are obtained in the digraph-theory framework and provide computationally efficient tests. 相似文献
10.
BRUNO ANDO SALVATORE BAGLIO SALVATORE GRAZIANI NICOLA PITRONE 《International Journal of Electronics》2013,100(7):791-806
The notion of noise-activated systems has been well known since the 1950s. A number of natural phenomena have been investigated by means of this theory and an improvement in the performance of several systems has also been achieved. Recently the stochastic resonance (SR) phenomenon was introduced as an innovative approach for both understanding the behaviour and improving the performance of several classes of systems. In the present work some new results regarding the influence of forcing signal parameters on the persistence of the SR condition are given. Both theoretical results and numerical simulations have been carried out to emphasize the suitability of the proposed noise tuning methodology. 相似文献