State system for ensuring the uniformity of measurements. National standard. Standard reference data. Tellurian glasses of system TeO2 + R2O and their fusions. Thermal conductivity in the temperatures range from 300 K to 800 К and concentration of oxides of alkaline R2O
Lasers and laser-related equipment. Test methods for laser beam widths, divergence angles and beam propagation ratios. Part 1. Stigmatic and simple astigmatic beams
