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.
Skin pigmentation problems occur because the body produces either too much or too little melanin. Melanin is the pigment in skin produced by specific cells (melanocytes). It is triggered by an enzyme called tyrosinase, which creates the color of our skin, eyes, and hair.