The Three-Phase Structure of Random Butene-1/Ethylene Copolymers

2016 ◽  
Vol 31 (5) ◽  
pp. 647-654 ◽  
Author(s):  
M. L. Di Lorenzo ◽  
R. Androsch ◽  
I. Stolte ◽  
M. C. Righetti
Keyword(s):  
Phase Structure ◽  
Ethylene Copolymers ◽  
Three Phase

Three-phase structure invariants and structure factors determined with the quantitative convergent-beam electron diffraction method

1999 ◽  
Vol 55 (2) ◽  
pp. 188-196 ◽  
Author(s):  
R. Høier ◽  
C. R. Birkeland ◽  
R. Holmestad ◽  
K Marthinsen
Keyword(s):  
Electron Diffraction ◽  
Phase Structure ◽  
Diffraction Method ◽  
Convergent Beam Electron Diffraction ◽  
Beam Electron ◽  
Structure Factors ◽  
Refinement Method ◽  
Three Phase ◽  
Phase Sensitive ◽  
Convergent Beam

Quantitative convergent-beam electron diffraction is used to determine structure factors and three-phase structure invariants. The refinements are based on centre-disc intensities only. An algorithm for parameter-sensitive pixel sampling of experimental intensities is implemented in the refinement procedure to increase sensitivity and computer speed. Typical three-beam effects are illustrated for the centrosymmetric case. The modified refinement method is applied to determine amplitudes and three-phase structure invariants in noncentrosymmetric InP. The accuracy of the results is shown to depend on the choice of the initial parameters in the refinement. Even unrealistic starting assumptions and incorrect temperature factor lead to stable results for the structure invariant. The examples show that the accuracy varies from 1 to 10° in the electron three-phase invariants determined and from 0.5 to 5% for the amplitudes. Individual phases could not be determined in the present case owing to spatial intensity correlations between phase-sensitive pixels. However, for the three-phase structure invariant, stable solutions were found.

Three-phase structure of the East Asia summer monsoon during Heinrich Stadial 4 recorded in Xianyun Cave, southeastern China

2021 ◽  
Vol 274 ◽  
pp. 107267
Author(s):  
Xin Zhang ◽  
Wanyin Qiu ◽  
Xiuyang Jiang ◽  
Hsun-Ming Hu ◽  
Haiyan Xiao ◽  
...  
Keyword(s):  
East Asia ◽  
Summer Monsoon ◽  
Phase Structure ◽  
Southeastern China ◽  
East Asia Summer Monsoon ◽  
Three Phase

Observations of a three-phase structure in high-modulus PAN-based carbon fibres

1973 ◽  
Vol 8 (2) ◽  
pp. 286-290 ◽  
Author(s):  
D. J. Johnson ◽  
D. Crawford ◽  
B. F. Jones
Keyword(s):  
Phase Structure ◽  
Carbon Fibres ◽  
High Modulus ◽  
Three Phase
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