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A wide range of photodetectors has been investigated, at various wavelengths and in various time domain operating conditions (from low frequency modulated cw sources to pulsed sources). The most promising devices, which have been realized, optimized (by us ...
It is now generally recognized that the excitation frequency is an important parameter in radio-frequency (rf) plasma-assisted deposition. Very-high-frequency (VHF) silane plasmas (50-100 MHz) have been shown to produce high quality amorphous silicon films ...
In this study we investigated whether there exists a periodic contractile activity of the radial artery, and we evaluated the impact of such an oscillatory behavior on the mechanical properties of this medium-sized muscular vessel. The internal diameter of ...
In high-resoln. NMR spectra of scalar coupled spins in isotropic phase, it is possible to convert single- into triple-quantum coherences and vice versa by irradiating simultaneously at the frequencies of 3 chem. shifts. A triple resonance condition can be ...
Hydrogenated amorphous silicon has been prepared at a plasma excitation frequency in the very-high-frequency band at 70 MHz with the glow discharge technique at substrate temperatures between 280 and 50-degrees-C. The structural properties have been studie ...
The surface impedance of type-II superconductors in the mixed state has been measured as a function of the magnetic field in the low-frequency limit. At the low magnetic fields close to the lower critical field the surface impedance was observed to be prop ...
A zero-field spontaneous relaxor-ferroelectric transition is reported in Pb(Sc0.5Ta0.5)O3 (PST). This behavior is different from that of other relaxors, where such transitions occur only under the field. A highly disordered PST that has the wide relaxation ...
Low-frequency losses in weakly anharmonic cubic centrosymmetric crystals as a function of permittivity are estimated using phonon kinetics approach. It is shown that very steep dependencies up to the fifth power of permittivity (epsilon'' is-proportional-t ...
Five Ba(B'1/2B1/2'')O3 ceramic compounds (B' = Y3+, Gd3+, Nd3+, In3+; B'' = Ta and B' = Mg2+; B'' = W6+) have been prepared to investigate the origin of microwave losses. Infrared reflectivity and submillimetre transmission measurements as well as low-freq ...
DC-SQUIDs made of refractive materials NbN-MgO-NbN were prepared using thin film preparation techniques. The noise properties of these SQUIDs were investigated. The white energy sensitivity of typical devices is 600h (8mF0/ÃHz). The measured values are co ...
