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.
Factors responsible for Pigmentation. 1  Melanin may be the pigment which gives the skin its shade. 2  The amount of melanin from the skin is liable for the gentle or dark tone. 3  Pigmented wounds are generally dark within shade due to the fact that melanin can be a lot more centered in one section of the skin.