No abstract

This versatile bridge circuit based on the multivibrator has a number of desirable features. Its output may be telemetered, recorded on magnetic tape or integrated. The circuit has been applied to an advanced system of temperature measurement.

Green-Schwarz action of Type IIB string on AdS 3 × S 3 is constructed via coset superspace approach. The construction relies exclusively on symplectically Majorana-Weyl spinor formalism, thus permitting it easier to prove κ-symmetry for on-shell Type IIB supergravity backgrounds.

We study theoretically the effects of exciton bound states on the reflectivity of semiconductor superlattices and thin films. We consider direct gap semiconductors and assume extrinsic potentials near surfaces to model the exciton interactions. Using a multistep method and the 4 × 4 transfer matrix approach, we solve analytically the polariton exciton equations for s-polarized light. Results are presented for the A n=1 excitonic transition of CdS and interpreted in terms of exciton bound states and Fabry-Pérot resonances of the transverse modes. We find that for the superlattice the reflectivity peaks of the high-energy bound states are notably enhanced as compared with the corresponding ones of the single isolated film.

No abstract