In this paper we propose a method to improve thewaveguides for optical communications based on 2-dimen-sional photonic crystals. To this purpose a standard channelwaveguide is sandwiched between two omnidirectionalChigrin-type 1D dielectric layer stacks. The combination oftotal internal reflection and photonic band gap reflectionenables improved confinement of optical si...

Seismic data are considered crucial sources of that help identify the litho-fluid facies distributions in reservoir rocks. However, different mostly have similar responses to seismic attributes. In addition, anisotropy negatively affects predictors extracted from data. Accordingly, this study aims at estimating zero-offset acoustic and shear impedances based on partial-stack inversion by two me...

the chah morra cu occurrence is located 15 to 20 km north of toroud village, south of shahrood. in this area, cu deposits are hosted by the andesitic sequence and most of rocks in this area are composed of andesite. veins contain minerals such as digenite, bornite, covellite, malachite, cuprite, tenorite, native copper and fe oxide and hydroxides. also some orthomagmatic magnetite and chalcopyr...