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.
CHEMICALS USED IN PULP &PAPER MANUFACTURING AND COATING. While there are about 3000 or so different types of chemicals which can be used in papermaking, in practice only about 200 individual chemicals are typically used, each satisfying a specific need. It gives paper a greasy or soapy feel. and enables it to take a high finish. A calcium salt that is used for a variety of purposes including: building materials. Pigment coating Binder. Used for chelation (removal of transition metals from pulp). Used for chelation (removal of transition metals from pulp).