Terminal settling velocity of solids in the pseudoplastic non-Newtonian liquid system – Experiment and ANN modeling

The terminal settling velocity (TSV) of solid particles is experimentally determined in fluidizing columns. In monodispersed (single component) systems, the bed expansion behavior has been experimented with using pseudoplastic liquids. The terminal velocity is calculated from the plot of bed voidage (ε) vs. liquid velocity and extrapolating to ε = 1.0. An empirical correlation is developed for determining the TVS with acceptable statistical accuracy. Successful applicability of ANN modeling has been reported. After comparing with existing literature, it was found that the present work yielded better results (based on the statistical error parameters) than the previous literature

Improved performance of the Hopfield and little neural network models with time delayed dynamics

We report the results of simulation of neural network models with the synaptic connections constructed using the Hebb's rule and the dynamics determined by the internal field, which has a weighted contribution from the time delayed signals. We consider both the asynchronous (or Glauber; Hopfield) and synchronous (Little) dynamics. Our numerical results and the finite size variation study (for sizes N within the range 250 ≤N≤4000) support the previous indication [Sen and Chakrabarti, Phys. Lett. A162, 327 (1992)] of improved performance in the recall and overlap properties in the thermodynamic limit. It is identified that the time delayed term in the dynamics allows the network to come out of the spurious valleys in the "energy landscape" (defined without the delay term; Hopfield model). In an approximate analytical study of such models in the extreme dilution limit, the role of the time delayed term to suppress the (spin glass-like) noise is also indicated

A new photoluminescent Cu<SUP>I</SUP><SUB>2</SUB>N<SUB>6</SUB> chromophore

A novel CuI2N6 chromophore has been isolated with 2,2'-bis[(4R)-phenyl]-1,3-oxazoline (L) in the optically pure triple-stranded helicate [Cu2L3](ClO4)2, which displays photoluminescence in methanol at room temperature (emission maximum λem = 385 nm; quantum yield Φ = 1.6 x 10-4; lifetime τ ≈ 2 ns) as well as at 77 K (λem = 430 nm; τ = 0.89 ± 0.13 s)