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Quaternary glasses with composition (40-x) Li2O:30B2O3:30Bi2O3: x ZnO have been prepared with x varying from 0 to 6 mol%. The structural investigation of these glasses has been carried out by infrared (IR) absorption spectra. Addition of ZnO in the glass is favorable for the creation of BiO6 units on account of the substitution of B-O bond by Bi-O bond. Changes in density and molar volume in glasses have been studied. Molar volume reduces which is ascribed to the decrease in boron-boron spacing, d<B-B>. Increment in cut off wave length and decrement in. optical band gap energy is observed in Optical absorption spectra with increase in ZnO on account of rise in Non-Bridging Oxygens Electronic polarizability and optical basicity was also studied.

This is an extended work of the authors on coupled logistic maps with delayed linear, or non-linear nearest neighbor coupling. Here we investigate the effect of positive feedback in the coupled map lattices with update rules on (i) the phase diagrams showing non-zero persistence in the μ-ε parameter space, and (ii) on power law exponents of decay of persistence. We find that while feedback is increased the increased non-zero persistence regions in the phase diagram has no noticeable effect on the power law exponents. We also find that the role played by time lag in the absence of feedback, discussed in our previous work, remains intact even with the introduction of feedback. We offer an extensive comparison of without feedback and with feedback plots.

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