GaN microcrystalline grains were grown by hot-wall chemical vapor deposition on Si (111)substrate. These grains with diameters of 2- 4 μm were detected by scan
The security of civil engineering is an important task due to the economic, social and environmental significance. Compared with conventional sensors, the optic
In the Fresnel transform domain, an effective improvement to the conventional iterative algorithm for designing the diffractive optical elements (DOEs) used for