Linked Life Data

19051298

Source:http://linkedlifedata.com/resource/pubmed/id/19051298

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2009-3-25
pubmed:abstractText
The key techniques for determining orientation angle (OA) and interlayer space (d002) of pyrocarbon were investigated by analyzing selected area electron diffraction (SAED) patterns. A series of algorithms, which mainly include the five-point center-determined technique, the integral factor for the ellipse detection, the background subtraction operation and the Gaussian multipeak fitting algorithm, were designed for intensity sampling, data correction, and data fitting. The contribution ratio of the reflection intensity to the average d002 was considered. The algorithms were programmed and applied to evaluate SAED patterns of pyrocarbon in C/C composites by chemical vapor infiltration. Results showed that the proposed techniques can be effectively used to measure various SAED patterns, with a beam stop image or not, of pyrocarbon. The azimuthal intensities along the (002) arcs essentially obey the Gaussian distribution, although this is not obvious for the lower textural pyrocarbon. It is necessary for accurate OA to use the Gaussian multipeak fitting algorithm.
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Apr
pubmed:issn
1097-0029
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
72
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
338-42
pubmed:year
2009
pubmed:articleTitle
Research on precision-calibration techniques for selected area electron diffraction patterns of pyrocarbon.
pubmed:affiliation
School of Mechatronic, Northwestern Polytechnical University, 710072 Xi'an, China. qilehua@nwpu.edu.cn
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't