For a typical steel framed 30 ft by 30 ft office building bay, the fre-quency will be in the 5-8 Hz range. Frequency is a function of span (the longer the span, the lower the frequen-cy) and weight supported (the heavier the floor and the supported contents, the lower the frequency).
The following medical conditions are some of the possible causes of Skin color changes. There are likely to be other possible causes, so ask your doctor about your symptoms. 1  Causes of skin whitening:  Vitiligo.
What we did know was that skin color, like hair and eye color, is the result of more than one gene. Lots of genes work together to determine our coloring. We also knew of a few changes in genes that could make people have albinism (where they don't really have any pigment).