Pulverization phenomenon

Abrasive wear can be classified into three types. Gouging abrasion is a high stress phenomenon that is likely to be accomplished by high comprehensive stress and impact. Grinding abrasion is a high stress abrasion that pulverizes fragments of the abrasive that become sandwiched between metal faces. And erosion is a low-stress scratching abrasion. 

Observations on metal hydride materials that undergo similar large volume changes have shown that the pulverization process does not continue indefinitely. Instead, there is a characteristic terminal particle size for each particular material, and particles below this size do not fracture further. Experiments on Li alloy electrodes have shown that electrochemical cycling is significantly improved if the initial particle size is very small, consistent with the terminal particle size phenomenon. With all of these problems in mind, a Si nanowire (SiNW)-based electrode was envisioned. While NW and nanorod materials have been used in Li-battery applications, the... 

G.i Iris Absolut/Ol E absolue/essence d iris The rhizomes (subterranean stems) of the - orris flower are the starting material for the most expensive - fragrance and - flavor raw material. After harvesting, the rhizomes have to be washed, decorticated and stored for three years fresh material is practically odorless. The material is then pulverized and steam-distilled with an extremely low yield (<0.1%). The resulting - essential oil solidifies in the receiver to a wax-like, cream-colored mass, which explains why this product is frequently termed orris concrete or orris butter. This phenomenon is due to the high content (85-90%) of - myristic acid, which is removed by alkaline washing of the orris oil in ether solution to yield orris absolute. 

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