Acoustic double layer structures in dense magnetized electron-positron-ion plasmas

2011 ◽  
Vol 18 (11) ◽  
pp. 112506 ◽  
Author(s):  
N. Akhtar ◽  
S. Mahmood
Keyword(s):  
Double Layer ◽  
Electron Positron ◽  
Layer Structures

Restricted Rotational Motion of InterlayerWaterMolecules in Vanadium Pentoxide Hydrate, V2O5·n D2O, as Studied by Deuterium NMR

2002 ◽  
Vol 57 (6-7) ◽  
pp. 419-424 ◽  
Author(s):  
Sadamu Takeda ◽  
Yuko Gotoh ◽  
Goro Maruta ◽  
Shuichi Takahara ◽  
Shigeharu Kittaka
Keyword(s):  
Double Layer ◽  
Vanadium Pentoxide ◽  
Rotational Motion ◽  
Interlayer Space ◽  
Layer Structure ◽  
Bond Distance ◽  
Adsorbed Water ◽  
Deuterium Nmr ◽  
Water Molecules ◽  
Layer Structures

The rotational behavior of the interlayer water molecules of deuterated vanadium pentoxide hydrate, V2O5.nD2O, was studied by solid-state deuterium NMR for the mono- and double-layer structures of the adsorbed water molecules. The rotational motion was anisotropic even at 355 K for both the mono- and double-layer structures. The 180° flipping motion about the C2-symmetry axis of the water molecule and the rotation around the figure axis, which makes an angle Ɵ with the C2-axis, occurred with the activation energy of (34±4) and (49±6) kJmol-1, respectively. The activation energies were almost independent of the mono- and double-layer structures of the water molecules, but the angle Ɵ made by the two axes varied from 33° for the monolayer to 25° for the double-layer at 230 K. The angle started to decrease above 250 K (e. g. the angle was 17 at 355 K for the double-layer structure). The results indicate that the average orientation of the water molecules in the two dimensional interlayer space depends on the layer structure and on the temperature. From the deuterium NMR spectrum at 130 K, the quadrupole coupling constant e2Qq/h = 240 kHz and the asymmetry parameter η= 0.12 were deduced. These values indicate the average hydrogen bond distance R(O H) = 2.0 Å for the D2O molecules in the 2D-interlayer space

scholarly journals Observational tests of the bow shock theory of Herbig-Haro objects

1987 ◽  
Vol 122 ◽  
pp. 187-188
Author(s):  
K.-H. Böhm ◽  
A. C. Raga ◽  
J. Solf
Keyword(s):  
Double Layer ◽  
Bow Shock ◽  
Emission Lines ◽  
Low Velocity ◽  
Layer Structures

We discuss four different tests of the bow-shock theory of Herbig-Haro objects, emphasizing especially tests based on position-velocity diagrams and on the appearance of “double layer” structures in the spatial maxima of the high- and low-velocity components of the emission lines. Though this latter effect is surprising, it is a fundamental consequence of the bow shock theory.

Electrical properties of silicon oxide/polyimide double layer structures

2002 ◽  
Author(s):  
A. Lian ◽  
L. Martinu ◽  
J.E. Klemberg-Sapieha ◽  
M.R. Wertheimer
Keyword(s):  
Electrical Properties ◽  
Double Layer ◽  
Silicon Oxide ◽  
Layer Structures

Magnetic properties of two double-layer structures built from hydroxynaphthoic acids and manganese

2005 ◽  
Vol 61 (7) ◽  
pp. m361-m364 ◽  
Author(s):  
Martin U. Schmidt ◽  
Edith Alig ◽  
Lothar Fink ◽  
Michael Bolte ◽  
Robin Panisch ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Double Layer ◽  
Layer Structures
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