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A covariance analysis of a scalar field in 30 and ID turbulent Bows is performed on the basis of the convectivediffusion equation. Physically distinguished scales for coherent stiumures in the inertialconvective range are obtained.

We extend our previous formulation of low-energy QCD in terms of an effective lagrangean containing operators of dimensionality d ≤ 6 constructed with pseudoscalars and quark fields, describing physics below the scale of chiral symmetry breaking. We include in this paper the vector and axial-vector channels. We follow closely the Extended Chiral Quark Model approach and consistently work in the large-N c and leading log approximation and take into account the constraints from chiral symmetry and chiral symmetry restoration. The optimal fit of all parameters gives further support to a heavy scalar meson with a mass ∼ 1 GeV and a value of the axial pion-quark coupling constant g A 0.55 to 0.66, depending on some assumptions concerning the Weinberg sum rules.

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The design of pulse compressors based on stimulated Brillouin scattering for the generation of subnanosecond pulses at energies approaching the Joule level is an active field of research. Backward stimulated Raman scattering allows for further compression of the pulse up to tens picosecond with production of light at new wavelengths. We present a design of laser with a multiple-cell stimulated scattering pulse compression which can output up to 500mJ per pulse with a 7-ns to 50-ps pulse duration and a 5-Hz pulse repetition rate.