The first day of school in the China falls on 1 September, or the first Monday following if September 1 is a Friday, Saturday, or Sunday. In northeastern China, schools open on Monday in mid-August after summer vacation.
3) Improper heating profiles setting lead to unbalanced heating zones temperature inside heating furnace, which causes uneven glass temperature on both different parts of the glass sheet and between the top and bottom glass surfaces, thus may brings irregular white haze on glass surfaces.
According to the data of [7], the color change of the glasses is due to redox processes occurring with the participation of bismuth ions during glassmaking. Increasing the phosphorus oxide (V) concentration in the initial mix gives a similar result, but color intensification slows down for molar content above 8.6%.