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.
Most significant factor in skin color. Produced by melanocytes in the stratum basale. Two forms: eumelanin=brownish black and pheomelanin= A reddish yellow sulfur containing pigment these determine the different shades of skin. People of different skin colors have the same number of melanocytes.