Upper layer temperature structure of the western tropical Atlantic

1994 ◽  
Vol 99 (C9) ◽  
pp. 18225 ◽  
Author(s):  
Robert L. Molinari ◽  
Elizabeth Johns
Keyword(s):  
Temperature Structure ◽  
Tropical Atlantic ◽  
Upper Layer Temperature

Generation of 4H and 6H Structures During the Hexagonal-Rhombohedral Transformation in Dy2Co17

1975 ◽  
Vol 33 ◽  
pp. 38-39
Author(s):  
C. W. Allen ◽  
D. L. Kuruzar
Keyword(s):  
Elevated Temperatures ◽  
Layer Structure ◽  
Transition Element ◽  
Temperature Structure ◽  
Allotropic Transformation ◽  
Layer Plane ◽  
Planar Defects ◽  
Topologically Close Packed ◽  
Transformation Mechanisms ◽  
Shear Transformation

The rare earth/transition element intermetallics R2T17 are essentially topologically close packed phases for which layer structure models have already been presented. Many of these compounds are known to undergo allotropic transformation of the type at elevated temperatures. It is not unexpected that shear transformation mechanisms are involved in view of the layering character of the structures. The transformations are evidently quite sluggish, illustrated in furnace cooled Dy2Co17 by the fact that only rarely has the low temperature rhombohedral form been seen. The more usual structures observed so far in furnace cooled alloys include 4H and 6H in Dy2Co17 (Figs. 1 and 2) . In any event it is quite clear that the general microstructure is very complicated as a consequence of the allotropy, illustrated in Fig. 3. Numerous planar defects in the layer plane orientation are evident as are non-layer plane defects inherited from a high temperature structure.

Direct phase determination in electron crystallography: small organic molecules

1992 ◽  
Vol 50 (2) ◽  
pp. 1166-1167
Author(s):  
Douglas L. Dorset
Keyword(s):  
Organic Molecules ◽  
Data Sets ◽  
Temperature Structure ◽  
3D Analysis ◽  
Intensity Data ◽  
Electron Crystallography ◽  
Phase Determination ◽  
Measured Intensity ◽  
3D Data

The quantitative use of electron diffraction intensity data for the determination of crystal structures represents the pioneering achievement in the electron crystallography of organic molecules, an effort largely begun by B. K. Vainshtein and his co-workers. However, despite numerous representative structure analyses yielding results consistent with X-ray determination, this entire effort was viewed with considerable mistrust by many crystallographers. This was no doubt due to the rather high crystallographic R-factors reported for some structures and, more importantly, the failure to convince many skeptics that the measured intensity data were adequate for ab initio structure determinations.We have recently demonstrated the utility of these data sets for structure analyses by direct phase determination based on the probabilistic estimate of three- and four-phase structure invariant sums. Examples include the structure of diketopiperazine using Vainshtein's 3D data, a similar 3D analysis of the room temperature structure of thiourea, and a zonal determination of the urea structure, the latter also based on data collected by the Moscow group.

Barrier layers and tropical Atlantic SST biases in coupled GCMs

2008 ◽  
Author(s):  
W. -P. Breugem ◽  
P. Chang ◽  
C. J. Jang ◽  
J. Mignot ◽  
W. Hazeleger
Keyword(s):  
Tropical Atlantic ◽  
Barrier Layers

ANALYTICAL AND EXPERIMENTAL STUDIES OF THE TEMPERATURE STRUCTURE WITHIN THE ART CORE

1957 ◽  
Author(s):  
H. F. Poppendiek ◽  
N. D. Greene ◽  
L. D. Palmer ◽  
G. L. Muller ◽  
G. M. Winn
Keyword(s):  
Experimental Studies ◽  
Temperature Structure

Phylogenetic dynamics of Tropical Atlantic Forests

2021 ◽  
Author(s):  
Écio Souza Diniz ◽  
Markus Gastauer ◽  
Jan Thiele ◽  
João Augusto Alves Meira-Neto
Keyword(s):  
Tropical Atlantic
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