High pressure spectroscopy of heavily doped ruby

No abstract availabl

Simulation of a Solar Domestic Water Heater

It is useful to introduce a simulation program for function of a simple solar installation in summer days, which embrace way of consuming and various ambient parameters. Numerous simplifications are assumed for performing the simulation with the aid of simple calculators (for example Excell) during a single interval DT. The variations of thermal parameters are calculated with intervals (fractions DT). For simulation of function of the installation during 48 hours, 4 initial hours were ta-ken at 52/DT intervals of time. Designate initial instant T0 and interval DT (1 hour or its fraction 0,5, 0,25, … of hour), the instant T become successively T+DT

Piezoelectric spectroscopic studies of Zn

This paper presents results of experimental and theoretical piezoelectric studies of a group of mixed crystals of the type Zn1 - x - yBexMnySe. The fittings of theoretical to experimental amplitude and phase piezoelectric spectra were performed in a modified Jackson and Amer model. The influence of the surface treatment such as grinding, polishing and etching on the PZE spectra is analysed in the model of surface defects applied for the interpretation of the spectra for energies of photons below the energy gap of the crystal