Electronic and geometric structure analysis of neutral and anionic metal nitric chalcogens: The case of MNX series (M=Li, Na, Be and X=O, S, Se, Te)

2019 ◽  
Vol 40 (19) ◽  
pp. 1740-1751 ◽  
Author(s):  
Isuru R. Ariyarathna ◽  
Evangelos Miliordos
Keyword(s):  
Structure Analysis ◽  
Geometric Structure

Semantic Correspondence with Geometric Structure Analysis

2021 ◽  
Vol 17 (3) ◽  
pp. 1-21
Author(s):  
Rui Wang ◽  
Dong Liang ◽  
Xiaochun Cao ◽  
Yuanfang Guo
Keyword(s):  
Structure Analysis ◽  
Geometric Structure ◽  
Ratio Method ◽  
Distance Ratio ◽  
Image Correspondence ◽  
Similar Images ◽  
Real World Datasets ◽  
Permutation Problem ◽  
Smoothness Term ◽  
Symmetric Structures

This article studies the correspondence problem for semantically similar images, which is challenging due to the joint visual and geometric deformations. We introduce the Flip-aware Distance Ratio method (FDR) to solve this problem from the perspective of geometric structure analysis. First, a distance ratio constraint is introduced to enforce the geometric consistencies between images with large visual variations, whereas local geometric jitters are tolerated via a smoothness term. For challenging cases with symmetric structures, our proposed method exploits Curl to suppress the mismatches. Subsequently, image correspondence is formulated as a permutation problem, for which we propose a Gradient Guided Simulated Annealing (GGSA) algorithm to perform a robust discrete optimization. Experiments on simulated and real-world datasets, where both visual and geometric deformations are present, indicate that our method significantly improves the baselines for both visually and semantically similar images.

Geometric structure analysis of document images: a knowledge-based approach

2000 ◽  
Vol 22 (11) ◽  
pp. 1224-1240 ◽  
Author(s):  
Sung-Bae Cho ◽  
Yoon-Chul Choy ◽  
Kyong-Ho Lee
Keyword(s):  
Structure Analysis ◽  
Geometric Structure ◽  
Document Images ◽  
Knowledge Based

200kv superconducting cryo electron microscope

1987 ◽  
Vol 45 ◽  
pp. 642-643
Author(s):  
M. Iwatsuki ◽  
Y. Kokubo ◽  
Y. Harada ◽  
J. Lehman
Keyword(s):  
Electron Microscope ◽  
Structure Analysis ◽  
Organic Materials ◽  
Strong Interactions ◽  
Specimen Preparation ◽  
Great Effort ◽  
Electron Microscopic ◽  
Crystal Fields ◽  
Special Skill ◽  
Long Time

In recent years, the electron microscope has been significantly improved in resolution and we can obtain routinely atomic-level high resolution images without any special skill. With this improvement, the structure analysis of organic materials has become one of the interesting targets in the biological and polymer crystal fields.Up to now, X-ray structure analysis has been mainly used for such materials. With this method, however, great effort and a long time are required for specimen preparation because of the need for larger crystals. This method can analyze average crystal structure but is insufficient for interpreting it on the atomic or molecular level. The electron microscopic method for organic materials has not only the advantage of specimen preparation but also the capability of providing various information from extremely small specimen regions, using strong interactions between electrons and the substance. On the other hand, however, this strong interaction has a big disadvantage in high radiation damage.

Crystal structure analysis in (3 d) dimensions

1989 ◽  
Vol 16 (1) ◽  
pp. 119-123
Author(s):  
D. Kucharczyk
Keyword(s):  
Crystal Structure ◽  
Structure Analysis ◽  
Crystal Structure Analysis

The geometric structure and optical response of gaseous endohedral magnesium-fullerenes

2003 ◽  
Vol 50 (15-17) ◽  
pp. 2691-2704 ◽  
Author(s):  
M. Aichinger ◽  
S. A. Chin ◽  
E. Krotscheck ◽  
H. A. Schuessler
Keyword(s):  
Geometric Structure ◽  
Optical Response

RETRIEVE – a system for XRPD phase and structure analysis

2009 ◽  
Vol 2009 (30) ◽  
pp. 209-214 ◽  
Author(s):  
P. S. Dubinin ◽  
I. S. Yakimov ◽  
O. E. Piksina ◽  
Y. I. Yakimov ◽  
A. N. Zaloga
Keyword(s):  
Structure Analysis
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