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During years with normal to less than normal rainfall , there is currently insufficient habitat - managed or natural , public or private to meet the wintering needs of large waterfowl populations . Inasmuch as a body could not be shielded from the radiated heat of the bow shock , it was obviously essential to reduce the intensity of the shock by changing its shape from normal to inclined . For example , Amontons ' law , first stated 300 years ago , says friction is proportional to force applied normal to ( perpendicular to ) a surface . However , for PM the diffusion normal to level sets is first forward and then backward . Glitches can be moved in energy , if not eliminated , by azimuthal ( axis of rotation normal to crystal face ) rotation of one of the crystals in the monochromator .