Many people believe that slabs on ground typically should have some reinforcing, but most slabs in North America are unreinforced concrete and perform well. If reinforcing is utilized, the amount that should be used depends on what is to be accomplished.
Micelles are lipid molecules that arrange themselves in a spherical form in aqueous solutions. The formation of a micelle is a response to the amphipathic nature of fatty acids, meaning that they contain both hydrophilic regions (polar head groups) as well as hydrophobic regions (the long hydrophobic chain). Micelles contain polar head groups that usually form the outside as the surface of micelles.
The Purpose of Jewels in Watches. When a watchmaker speaks of the jewels in a watch, he or she is not talking about the decorative jewels that may adorn the exterior of the watch case; the watchmaker is referring to jewels which are used within the mechanism of the watch itself. The purpose of the jewels in the watch is to reduce friction. Jewels provide a very smooth, very hard, long-lasting bearing surface at various points within the watch in order to reduce friction and increase running efficiency.