uniformity ratio of illuminance
1.Ratio of the average illuminance on the working plane after a specified period of use of a lighting installation to the average illuminance obtained under the same conditions for a new installation.
6.Compared to SnMCM-41 with comparable mole ratio of Si/Sn (Si/Sn≈100) prepared by the mechanical commixture of nanometer SnO2 with MCM-41，the impregnation of MCM-41 with SnCl4 solution as well as the hydrothermal synthesis route，there are differences in the uniformity of pore distributions and sizes, big discrepancy in specific surface areas, and varied coordination forms of surface tin species.
8.Droplet distribution uniformity, drift and coverage ratio are main indices of appraisingspray quality.
9.The polarization grade of three lamps for the laboratory and the polarization error of two illuminance meters are measured.
10.In the conceptions of Ackerman steering ratio and steering gear armknuckle arm ratio, the equations for calculating the steering linkage reduction ratio are derived. The influence of steering linkage reduction ratio upon the uniformity of steering force and some main influential factors are discussed in this paper.
