the 31,095 students enrolled in GDOE
schools, 10,300 are enrolled in one
is a single, unified school district serving more than 30,000 students in 40 schools.
In Figure 4, the GDOES
depth profile results of tantalum, phosphorus, oxygen, copper, calcium, hydrogen, and nitrogen on one graph, are shown.
Chemical analysis of the anodic oxide layer was conducted using GDOES
The top surface analysis of the samples was studied by glow discharge optical emission spectroscopy (GDOES
)  using a GD Profiler 2 from Horiba/Jobin Yvon.
These samples were only used for measuring chemical profiles by glow discharge optical emission spectrometry (GDOES
Depth profiles in graphs, valuated by GDOES
, show steady transition of chemical composition from coating to base material.
Glow discharge optical emission spectrometry (GDOES
) was used to obtain an in-depth profile of composition.
The chemical composition of pure Al on the surface and substrate under this coating was measured by glow discharge optical emission spectroscopy (GDOES
) using Spectrumat GDS-750 device (see Tab.
Keywords Chromate conversion, Fractional factorial design, Zinc coating, GDOES