All-optical logic device is a vital element in ultra high speed all-optical networks. If the element is programmable then the device become more sophisticated and user friendly. In this study, a compact all-optical pr...
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All-optical logic device is a vital element in ultra high speed all-optical networks. If the element is programmable then the device become more sophisticated and user friendly. In this study, a compact all-optical programmable Boolean logic unit (PBLU) is proposed using two cascaded semiconductor optical amplifiers on the Mach-Zehnder interferometer arms-based switches. PBLU can perform any of the 16-Boolean all-optical logical operations (False, AB, A (B) over bar, A, (A) over barB, B, A circle plus B, A + B, (A) over bar(B) over bar, A circle dot B, (B) over bar, A + (B) over bar, (A) over bar, (A) over bar + B, (A) over bar + (B) over bar, True) according to the programming input. The performance of the circuit is evaluated through numerical simulation, which confirms its feasibility in terms of the choice of the critical parameters.
The technique of linear parametric programming has been applied to derive sets of internally consistent thermodynamic data for 21 condensed phases of the quaternary system CaO-Al2O3-SiO2-H2O (CASH) (Table 4). This was...
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The technique of linear parametric programming has been applied to derive sets of internally consistent thermodynamic data for 21 condensed phases of the quaternary system CaO-Al2O3-SiO2-H2O (CASH) (Table 4). This was achieved by simultaneously processing:a) calorimetric data for 16 of these phases (Table 1), and b) experimental phase equilibria reversal brackets for 27 reactions (Table 3) involving these phases. Calculation of equilibrium P-T curves of several arbitrarily picked reactions employing the preferred set of internally consistent thermodynamic data from Table 4 shows that the input brackets are invariably satisfied by the calculations (Fig. 2a). By contrast, the same equilibria calculated on the basis of a set of thermodynamic data derived by applying statistical methods to a large body of comparable input data (Haas et al. 1981; Hemingway et al. 1982) do not necessarily agree with the experimental reversal *** of some experimentally investigated phase relations not included into the linear programming input database also appears to be remarkably successful. Indications are, therefore, that the thermodynamic data listed in Table 4 may be used with confidence to predict geologic phase relations in the CASH system with considerable accuracy. For such calculated phase diagrams and their petrological implications, the reader’s attention is drawn to the paper by Chatterjee et al. (1984).
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