Undulator Spectra: Computer Simulations and Modeling

1986 ◽  
Author(s):  
Roman Tatchyn ◽  
Anthony D. Cox ◽  
Syed Qadri
Keyword(s):  
Computer Simulations ◽  
Simulations And Modeling

Reflections on Government’s Accountability in Complex Socio-Economic Realities (In the Post-Political Era)

2014 ◽  
pp. 302-324
Author(s):  
Lech W. Zacher
Keyword(s):  
Computer Simulations ◽  
Government Performance ◽  
Government Accountability ◽  
Qualitative And Quantitative ◽  
Effective Functioning ◽  
New Approaches ◽  
Present Complex ◽  
Quantitative Analyses ◽  
New Challenges ◽  
Simulations And Modeling

Government accountability is important for more rational and effective functioning of authorities and societies. The actual assessment of government performance in the present complex and diverse socio-economic realities is not possible without qualitative and quantitative analyses. Additionally, new approaches and methods in synchronization with ICTs, computer simulations, and modeling enable the improvement of execution of the governments. This chapter advocates that multicriterial and multilevel assessment of governments should be enriched by recognition and analyses of contexts in which they act. Government characteristics and the present contexts are diverse and their responses to new challenges are limited and differentiated.

Computer simulations and modeling-assisted ToxR screening in deciphering 3D structures of transmembrane α-helical dimers: ephrin receptor A1

2010 ◽  
Vol 7 (1) ◽  
pp. 016014 ◽  
Author(s):  
P E Volynsky ◽  
E A Mineeva ◽  
M V Goncharuk ◽  
Ya S Ermolyuk ◽  
A S Arseniev ◽  
...  
Keyword(s):  
Computer Simulations ◽  
3D Structures ◽  
Ephrin Receptor ◽  
Simulations And Modeling

A High Resolution Study of G.P. Zones in Aluminum - 4.2 at % Silver

1982 ◽  
Vol 40 ◽  
pp. 722-723 ◽  
Author(s):  
R. Gronsky
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Computer Simulations ◽  
Structural Characteristics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Resolution Study

The phenomenon of clustering in Al-Ag alloys has been extensively studied since the early work of Guinierl, wherein the pre-precipitation state was characterized as an assembly of spherical, ordered, silver-rich G.P. zones. Subsequent x-ray and TEM investigations yielded results in general agreement with this model. However, serious discrepancies were later revealed by the detailed x-ray diffraction - based computer simulations of Gragg and Cohen, i.e., the silver-rich clusters were instead octahedral in shape and fully disordered, atleast below 170°C. The object of the present investigation is to examine directly the structural characteristics of G.P. zones in Al-Ag by high resolution transmission electron microscopy.

Multislice calculations for quasi-periodic and non-periodic objects

1990 ◽  
Vol 48 (4) ◽  
pp. 138-139
Author(s):  
R. Herrera ◽  
A. Gómez
Keyword(s):  
Electron Diffraction ◽  
Computer Simulations ◽  
Periodic Table ◽  
Amorphous Materials ◽  
Space Group ◽  
Essential Step ◽  
Shape Effects ◽  
Atomic Scattering ◽  
Diffraction Patterns ◽  
Periodic Continuation

Computer simulations of electron diffraction patterns and images are an essential step in the process of structure and/or defect elucidation. So far most programs are designed to deal specifically with crystals, requiring frequently the space group as imput parameter. In such programs the deviations from perfect periodicity are dealt with by means of “periodic continuation”.However, for many applications involving amorphous materials, quasiperiodic materials or simply crystals with defects (including finite shape effects) it is convenient to have an algorithm capable of handling non-periodicity. Our program “HeGo” is an implementation of the well known multislice equations in which no periodicity assumption is made whatsoever. The salient features of our implementation are: 1) We made Gaussian fits to the atomic scattering factors for electrons covering the whole periodic table and the ranges [0-2]Å−1 and [2-6]Å−1.

Computer simulations for the TEM bend contour technique

1996 ◽  
Vol 54 ◽  
pp. 134-135
Author(s):  
Vladimir Yu. Kolosov ◽  
Anders R. Thölén
Keyword(s):  
Computer Simulations ◽  
Real Space ◽  
Advantages And Disadvantages ◽  
Short Overview ◽  
Diffraction Contrast ◽  
Beam Method ◽  
Convergent Beam ◽  
Contour Technique

In this paper we give a short overview of two TEM applications utilizing the extinction bend contour technique (BC) giving the advantages and disadvantages; especially we consider two areas in which the BC technique remains unique. Special attention is given to an approach including computer simulations of TEM micrographs.BC patterns are often observed in TEM studies but are rarely exploited in a serious way. However, this type of diffraction contrast was one of the first to be used for analysis of imperfections in crystalline foils, but since then only some groups have utilized the BC technique. The most extensive studies were performed by Steeds, Eades and colleagues. They were the first to demonstrate the unique possibilities of the BC method and named it real space crystallography, which developed later into the somewhat similar but more powerful convergent beam method. Maybe, due to the difficulties in analysis, BCs have seldom been used in TEM, and then mainly to visualize different imperfections and transformations.

Assessing "Dissimilarity From the Group": Evidence From Computer Simulations

2005 ◽  
Author(s):  
Natalie J. Allen ◽  
David Stanley ◽  
Helen Williams ◽  
Sarah J. Irwin
Keyword(s):  
Computer Simulations
Sign in / Sign up

Export Citation Format

Share Document