High-intensity focused ultrasound: Difference between revisions

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{{Multiple issues|orphan = February 2009|expert = Engineering|date = February 2009}}
Andera is what you can call her but she never truly favored that title. I am an invoicing officer and I'll be promoted quickly. For a while I've been in Mississippi but now I'm contemplating other choices. One of the issues she loves most is canoeing and she's been doing it for fairly a while.<br><br>Feel free to surf to my site: love psychic - [http://www.edmposts.com/build-a-beautiful-organic-garden-using-these-ideas/ www.edmposts.com],
 
In [[materials science]], a '''Lomer-Cottrell junction''' is a particular configuration of [[dislocation]]s.
 
When two perfect dislocations along a slip plane, each perfect dislocation can split into two [[Partial_dislocations| Shockley partial dislocations]]: a leading dislocation and a trailing dislocation. When the two leading [[Partial_dislocations| Shockley partials]] combine, they form a separate dislocation with a burgers vector that is not in the slip plane. This is the Lomer-Cottrell dislocation. It is sessile and immobile in the slip plane, acting as a barrier against other dislocations in the plane. The trailing dislocations pile up behind the Lomer-Cottrell dislocation, and an ever greater force is required to push additional dislocations into the pile-up.
 
ex. FCC lattice along {111} slip planes
 
              |leading| |trailing|
:<math>\frac{a}{2}[\text{0 1 1}] \rightarrow \frac{a}{6}[\text{1 1 2}] + \frac{a}{6}[\text{-1 2 1}]</math>
:<math>\frac{a}{2}[\text{1 0 -1}] \rightarrow \frac{a}{6}[\text{1 1 -2}] + \frac{a}{6}[\text{2 -1 -1}]</math>
 
Combination of leading dislocations:
:<math>\frac{a}{6}[\text{1 1 2}] + \frac{a}{6}[\text{1 1 -2}] \rightarrow \frac{a}{3}[\text{1 1 0}]</math>
 
The resulting dislocation is along the crystal face, which is not a slip plane in FCC at room temperature.
 
Lomer-Cottrell dislocation
 
==References==
{{reflist}}
 
[[Category:Materials science]]
 
 
{{engineering-stub}}

Latest revision as of 09:55, 5 January 2015

Andera is what you can call her but she never truly favored that title. I am an invoicing officer and I'll be promoted quickly. For a while I've been in Mississippi but now I'm contemplating other choices. One of the issues she loves most is canoeing and she's been doing it for fairly a while.

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