A test of the dipole model for the rotating magnetic white dwarf Feige 7

A centered dipole model for the high field magnetic white dwarf GRW + 70 deg 8247

The Astrophysical Journal ◽

10.1086/166184 ◽

1988 ◽

Vol 327 ◽

pp. 222 ◽

Cited By ~ 46

Author(s):

D. T. Wickramasinghe ◽

Lilia Ferrario

Keyword(s):

White Dwarf ◽

High Field ◽

Dipole Model

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A dipole model for magnetic white dwarf BPM 25114

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/183.3.533 ◽

1978 ◽

Vol 183 (3) ◽

pp. 533-538 ◽

Cited By ~ 11

Author(s):

B. Martin ◽

D. T. Wickramasinghe

Keyword(s):

White Dwarf ◽

Dipole Model

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A New Defect in Polyethylene Single Crystals

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100070795 ◽

1973 ◽

Vol 31 ◽

pp. 70-71

Author(s):

E. L. Thomas ◽

S. L. Sass

Keyword(s):

Single Crystals ◽

Screw Dislocation ◽

Small Distance ◽

Dipole Model ◽

Dislocation Dipole ◽

Chain Folding ◽

Black And White ◽

Polymer Crystal ◽

Different Types

In polyethylene single crystals pairs of black and white lines spaced 700-3,000Å apart, parallel to the [100] and [010] directions, have been identified as microsector boundaries. A microsector is formed when the plane of chain folding changes over a small distance within a polymer crystal. In order for the different types of folds to accommodate at the boundary between the 2 fold domains, a staggering along the chain direction and a rotation of the chains in the plane of the boundary occurs. The black-white contrast from a microsector boundary can be explained in terms of these chain rotations. We demonstrate that microsectors can terminate within the crystal and interpret the observed terminal strain contrast in terms of a screw dislocation dipole model.

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