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.

scholarly journals Optical shape analysis based on discrete Fourier transform and second-order moment analysis of the brightness distribution for the detection of sub-micron range tracks in nuclear emulsion

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Atsuhiro Umemoto ◽  
Tatsuhiro Naka ◽  
Toshiyuki Nakano ◽  
Ryuta Kobayashi ◽  
Takuya Shiraishi ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Discrete Fourier Transform ◽  
Nuclear Emulsion ◽  
Optical Microscope ◽  
Brightness Distribution ◽  
Second Order ◽  
Moment Analysis ◽  
Order Moment ◽  
Fine Grained ◽  
Nano Imaging

Abstract To recognize sub-micron-range low-energy tracks recorded in a super-fine-grained nuclear emulsion (Nano Imaging Tracker), an elliptical fitting method was devised to analyze anisotropic images taken by an optical microscope. We report on this newly developed method using a discrete Fourier transform and second-order moment analysis of the brightness distribution. We succeeded in lowering the ellipticity threshold, thereby improving the selection efficiency and angular resolution. Notably, the success of detecting carbon 30 keV tracks is the first such achievement in the world, where the incident direction of carbon 30 keV ions was determined with an accuracy of 41$^\circ$ and an efficiency of $1.7 \pm 0.1\%$.

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
Sign in / Sign up

Export Citation Format

Share Document