The present study considers some of dacarbazine tautomers having resulted from 1,3- and 1,5-proton migration. Density functional approach has been adopted at the level B3LYP/6-311++G(d,p) in order to obtain various geometrical, physicochemical, spectral quantum chemical properties concern. Also local aromaticity imidazole ring 6π-electrons obtained by calculating nucleolus independent shift val...

We consider the minimization of hit error rate (BER) for OFDM systems with orthogonal precoders. For low S N Q we show that the conventional OFDM system is the optimal solution and the optimal precoder is the identity matrix. For high SNR, corresponding to a relatively practical range of BER, there are channel independent solutions for optimal precoders. One such solution is the DFT matrix and ...

We study the problem of finding unitary submatrices of the discrete Fourier transform matrix. This problem is related to a diverse set of questions on idempotents on ZN , tiling ZN , difference graphs and maximal cliques. Each of these is related to the problem of interpolating a discrete bandlimited signal using an orthogonal basis.

PURPOSE The purpose of this study was to assess the relationship between baseline caries experience and the restoration replacement rate in children. METHODS The 5-year New England Children's Amalgam Trial recruited 534 6- to 10-year-old children with 2 or more carious posterior teeth. The association between decoy and longevity of restorations was assessed. Restorations with no follow-up (N ...