Submitted: Jun 21, 2013; Accepted: Jul 19, 2013; Published: Jul 25, 2013 Abstract: The article considers the possibility of using acoustic methods for non-destructive testing of strength and composition of building structures. Screening of multiple structures or structures with large geometrical dimensions (long tunnels, large area roofs, etc.) at first stage of testing the directly defined aco...

Metalorganic vapor phase epitaxy (MOVPE) of GaSb/InGaAsSb multilayer thin films and fabrication of bias-selectable dual band photodetectors are reported. For the dual band photodetectors the short wavelength detector, or the upper pGaSb/n-GaSb junction photodiode, is placed optically ahead of the long wavelength one, or the lower photodiode. The latter is based on latticed-matched In0.13Ga0.87A...

A novel multilayer material system consisting of lanthanum and molybdenum nano-layers for both broadband and highly reflecting multilayer mirrors in the energy range between 80 and 130 eV is presented. The simulation and design of these multilayers were based on an improved set of optical constants, which were recorded by extreme ultraviolet (XUV)/soft-x-ray absorption measurements on freestand...

The article presents methods for obtaining micro-holes in the manufacture of fine metal filter elements. analysis results experimental studies samples with holes made by electron beam and electroerosion perforation is carried out. advantages using multilayer structures filters are substantiated. research works out contribute to improving manufacturability products new generations technology, wh...

We have designed and implemented an experiment to measure the angular distributions energy spectra of transition radiation X-rays emitted by fast electrons positrons crossing different radiators. Our was selected among proposals 2021 Beamline for Schools contest, a competition high-school students organized every year CERN DESY, performed at DESY II Test Beam facility area TB21, using high-puri...

High-energy collective electronic excitations (plasmons) in freestanding multilayer graphene are studied by momentum-resolved electron energy-loss spectroscopy (EELS). For normal incidence, only the high-energy plasmon band is excited and we measure a blueshift of the π -plasmon dispersion with increasing thickness. The observed transition between two-dimensional and three-dimensional behavior ...

An experimental setup and procedure for accurate transmittance measurements of candidate filters for the Auger Fluorescence Detector is presented. For this check, we used the Hitachi U-2000 double-beam spectrophotometer (Sph) of the Chemical Department of the University of Athens (UoA). After the calibration of the Sph, we are able to observe transmittance deviations over the area of the filter...

We develop a more general methodology for a dual photoelastic modulator (PEM) system that is used for the determination of the Stokes parameters of an arbitrary light beam. This allows for a degree of arbitrariness in the setting of the retardation amplitudes of both PEMs, thus permitting a robust and effective optimization of the detection system. Various experimental issues are considered and...

We report a passively Q-switched Ho:YVO4 laser pumped at 1.94 μm with multilayer graphene as a saturable absorber. At the absorbed pump power of 9.3 W, the maximum average output power of 2.2 W was obtained in Ho:YVO4 laser with minimum pulse width of 265.2 ns and pulse repetition rate of 131.6 kHz at 2052.1 nm. In addition, a beam quality factor of M2~1.7 was measured at the maximum output lev...

The preparation, characterization, and study of small struct ures are problems of major current activity. 1,2 Many of the physical properties of microstructures such as small particles, muItilayers, or supedattices are strongly connected to their morphology. Structural characterization is mostly accomplished with the use of diffraction (x ray, neutron or electron) and imaging [transmission (TEM...