Direct operation over the UWB optical signal transferred with pseudo-random carrier

Modulation of white light emitted by the thermal source using simple optical systems capable to realize UWB information transfer are considered and realized. The experiments fulfilled permitted to estimate the minimum time resolution of the detection of signal with two-beams interferometer as 3.6 fs. For the effective time encoding method, the system based on Michelson echelon is proposed, its theory is developed using δ-wave approach for any angle of the beam incidence and scattering. Peculiarities of the echelon pulse response are analyzed. In addition, the simple method of digital encoding of the light flow with the pack of thin glasses of different thickness is demonstrated.     

Foundations formed from piles cast in punched holes

Behavioral characteristics of piles cast in punched holes, and also basic positions with regard to the design and installation of these foundations are cited.     

Computer methods of structural analysis

Amorphous metallic brazing alloys are used widely for brazing dissimilar materials, including corrosion-resisting steels. The results of detailed tests carried out in accordance with the GOST standard in tensile, impact, and bend loading are presented, and the results of non-standard torsion tests of brazed joints are also outlined.     

Radiation-induced shift and splitting of resonances in a system of metallic nanoclusters

A microscopic justification has been given for the experimentally observed shift and splitting of maxima of light scattering in silver nanoclusters upon changes in their size. It has been shown that the resonances of metallic nanoclusters can be strongly shifted with allowance for the self-effect in an optical-radiation field. A formula has been derived for the effective polarizability of valence electrons in a spherical metallic nanocluster when the self-effect of electrons in the field of an external optical radiation and the interaction of nanoclusters are taken into account. Using this formula, the optical properties of different optical systems composed of nanoparticles can be described, in particular, conditions were obtained under which the real index of refraction of these systems can take negative values. It has been shown that the shift of resonances in metallic nanoclusters makes it possible to reach an ideal antireflection coating of the surfaces of optical media coated by a layer of nanoparticles.