State system for ensuring the uniformity of measurements. State verification schedule for measuring means of spectral, integral and reduced regular transmittance and optical density within the wavelength range from 0,2 to 50,0 um, diffused and regular reflections within the wavelength range from 0,2 to 20,0 um
Polymer composites. Determination of the fracture resistance of adhesive joints under cleavage conditions by means of double cantilever beam and tapered double cantilever beam