• Hemiballismus - Wikipedia

    Ballismus or ballism (called hemiballismus or hemiballism in its unilateral form) is a very rare movement disorder.It is a type of chorea caused in most cases by a decrease in activity of the subthalamic nucleus of the basal ganglia, resulting in the appearance of flailing, ballistic, undesired movements of the limbs.

  • طرق لمعالجة الخامات - rkhi.in

    أبحاث ومعالجة المعادن - هيئة المساحة الجيولوجية السعوديةتهدف إلى المساهمة في تنمية ودعم صناعة التعدين من خلال تطبيق أحدث التقنيات المناسبة لمعالجة …

  • Ball mill - Wikipedia

    A ball mill is a type of grinder used to grind and blend materials for use in mineral dressing processes, paints, pyrotechnics, ceramics and selective laser sintering.It works on the principle of impact and attrition: size reduction is done by impact as the balls drop from near the top of the shell.