Critical evaluation of low-order moment expansions for the bonding energy of lattices and defects

1985 ◽  
Vol 32 (10) ◽  
pp. 6125-6130 ◽  
Author(s):  
Randall H. Brown ◽  
A. E. Carlsson
Keyword(s):  
Critical Evaluation ◽  
Bonding Energy ◽  
Order Moment ◽  
Low Order

On the geometry of d-orbitals: W (001) surface

1988 ◽  
Vol 53 (4) ◽  
pp. 661-664 ◽  
Author(s):  
Štěpán Pick
Keyword(s):  
Surface Reconstruction ◽  
Moment Analysis ◽  
Order Moment ◽  
Additional Mechanism ◽  
D Orbitals ◽  
Surface Coupling ◽  
Low Order

Low-order moment analysis of the W (001) surface reconstruction leads to the following conclusions: 1) The d-orbitals participate in the reconstruction-induced surface-surface coupling, the effect being most pronounced for the x2 - y2 orbital. 2) A non-negligible surface-bulk coupling exists and it is due to the (x - y) z orbital. An additional mechanism favouring the zig-zag mode is suggested.

Low‐order moment‐based estimation of shape parameter of CGIG clutter model

2016 ◽  
Vol 52 (18) ◽  
pp. 1561-1563 ◽  
Author(s):  
Han Yu ◽  
Peng‐Lang Shui ◽  
Yu‐Ting Huang
Keyword(s):  
Shape Parameter ◽  
Order Moment ◽  
Low Order

the effects of resonance with Jupiter in the system of short-period comets

1974 ◽  
Vol 22 ◽  
pp. 193-203
Author(s):  
L̆ubor Kresák
Keyword(s):  
Structural Effects ◽  
Order Resonance ◽  
Mean Motion ◽  
Short Period ◽  
The Mean ◽  
Compound Effect ◽  
Low Order

AbstractStructural effects of the resonance with the mean motion of Jupiter on the system of short-period comets are discussed. The distribution of mean motions, determined from sets of consecutive perihelion passages of all known periodic comets, reveals a number of gaps associated with low-order resonance; most pronounced are those corresponding to the simplest commensurabilities of 5/2, 2/1, 5/3, 3/2, 1/1 and 1/2. The formation of the gaps is explained by a compound effect of five possible types of behaviour of the comets set into an approximate resonance, ranging from quick passages through the gap to temporary librations avoiding closer approaches to Jupiter. In addition to the comets of almost asteroidal appearance, librating with small amplitudes around the lower resonance ratios (Marsden, 1970b), there is an interesting group of faint diffuse comets librating in characteristic periods of about 200 years, with large amplitudes of about±8% in μ and almost±180° in σ, around the 2/1 resonance gap. This transient type of motion appears to be nearly as frequent as a circulating motion with period of revolution of less than one half that of Jupiter. The temporary members of this group are characteristic not only by their appearance but also by rather peculiar discovery conditions.

Electron Microscopy of Metal-Matrix Composites

1970 ◽  
Vol 28 ◽  
pp. 404-405
Author(s):  
A. Lawley ◽  
M. R. Pinnel ◽  
A. Pattnaik
Keyword(s):  
Electron Microscopy ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Critical Evaluation ◽  
Elastic Behavior ◽  
Matrix Composites ◽  
Directionally Solidified ◽  
Fracture Characteristics ◽  
Broad Program

As part of a broad program on composite materials, the role of the interface on the micromechanics of deformation of metal-matrix composites is being studied. The approach is to correlate elastic behavior, micro and macroyielding, flow, and fracture behavior with associated structural detail (dislocation substructure, fracture characteristics) and stress-state. This provides an understanding of the mode of deformation from an atomistic viewpoint; a critical evaluation can then be made of existing models of composite behavior based on continuum mechanics. This paper covers the electron microscopy (transmission, fractography, scanning microscopy) of two distinct forms of composite material: conventional fiber-reinforced (aluminum-stainless steel) and directionally solidified eutectic alloys (aluminum-copper). In the former, the interface is in the form of a compound and/or solid solution whereas in directionally solidified alloys, the interface consists of a precise crystallographic boundary between the two constituents of the eutectic.

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