Hives on dark skin. Hives are a skin reaction that causes red or white itchy welts. The welts vary in size and appear and fade repeatedly as the reaction runs its course. Chronic hives are a condition in which the welts last more than six weeks or recur over months or years.Chronic hives usually aren't life-threatening. But the condition can be very uncomfortable and interfere with sleep and daily activities. Often, the cause of chronic hives is not clear.In some cases, chronic hives are a sign of an underlying health problem, such as thyroid disease or lupus. You can try various treatments to relieve your symptoms. For many people, antihistamine and anti-itch medications provide relief from chronic hives.hronic hives are a condition in which the welts last more than six weeks or recur over months or years. Chronic hives usually aren't life-threatening. But the condition can be very uncomfortable and interfere with sleep and daily activities. Often, the cause of chronic hives is not clear.
longitudinal magnetization. 1  of a material or medium in a manner in which the magnetic flux is essentially parallel to the long axis of the influencing field. 2  In magnetic recording, 3  of a material or medium essentially in the same direction as the material or medium is traveling.
Polarization is the aligning of vibrations in a transverse wave, usually by filtering out waves of other directions. Polarized light waves only travel vertically or horizontally -- when combined at right angles they block each other out and no net light can be detected.olarization is possible only when the direction of vibration is perpendicular to the direction of the wave travel, such is in light. In sound waves, the dire â¦ ction of vibration (compression) is the same direction as the direction of the travel of the sound wave, and therefore polarization is not possible.