- published: 10 May 2013
- views: 1286663
In materials science, a dislocation is a crystallographic defect, or irregularity, within a crystal structure. The presence of dislocations strongly influences many of the properties of materials. The theory was originally developed by Vito Volterra in 1905 but the term 'dislocation' was not coined until later by the late Professor Sir Frederick Charles Frank of the Physics Department at the University of Bristol. Some types of dislocations can be visualized as being caused by the termination of a plane of atoms in the middle of a crystal. In such a case, the surrounding planes are not straight, but instead bend around the edge of the terminating plane so that the crystal structure is perfectly ordered on either side. The analogy with a stack of paper is apt: if a half a piece of paper is inserted in a stack of paper, the defect in the stack is only noticeable at the edge of the half sheet.
There are two primary types: edge dislocations and screw dislocations. Mixed dislocations are intermediate between these.
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This dislocation I feelIs so very real
The soup of the day
Is losing appeal
But was it something I said
Or something you ate?
The service 'round here
Is so second rate
The hunger is gone
The hour is late
If heaven is here
Then heaven can wait
I'm driving you home
And you're such a tease
You're pleasure retarded
You do as you please
Travestites are made of this
I look in your eyes
There is something amiss
Travestites are made of this
I look in your eyes
You're a stranger to kiss
I look in your eyes