At the object level . Permissions allowed or denied at the object level apply to the entire object. For example, you can set an object-level permission on an OU object that allows a particular group, such as Account Operators, to create child objects in the OU. At the property level .
Ball mills are used in chemistry and in industry to grind hard solids to a very fine powder. They are very similar to rock tumblers. Basically, the idea is to rotate a container filled with heavy metal balls that crush the substance that you want to grind.
1 Used to test of carboxylic acid and alcohols. 2  It is also used in polymer industry. 3  This reaction is used in the manufacture of paints, varnishes, lacquers, medicines, dyes, soaps and synthetic rubber.  Moreover, chemicals like ether, chloroform and iodoform are made with the help of this particular reaction.