Qualitative Comparison of Proton Beams and Other Radiotherapy Beams

2020 ◽  
pp. 73-82
Author(s):  
Kenta Takada
Author(s):  
H. Kohl

High-Resolution Electron Microscopy is able to determine structures of crystals and interfaces with a spatial resolution of somewhat less than 2 Å. As the image is strongly dependent on instrumental parameters, notably the defocus and the spherical aberration, the interpretation of micrographs necessitates a comparison with calculated images. Whereas one has often been content with a qualitative comparison of theory with experiment in the past, one is currently striving for quantitative procedures to extract information from the images [1,2]. For the calculations one starts by assuming a static potential, thus neglecting inelastic scattering processes.We shall confine the discussion to periodic specimens. All electrons, which have only been elastically scattered, are confined to very few directions, the Bragg spots. In-elastically scattered electrons, however, can be found in any direction. Therefore the influence of inelastic processes on the elastically (= Bragg) scattered electrons can be described as an attenuation [3]. For the calculation of high-resolution images this procedure would be correct only if we had an imaging energy filter capable of removing all phonon-scattered electrons. This is not realizable in practice. We are therefore forced to include the contribution of the phonon-scattered electrons.


2008 ◽  
Author(s):  
J. Michael Norris ◽  
Michael Lewis ◽  
Michael Dorsey ◽  
Robert Kimbrough ◽  
Robert R. Holmes ◽  
...  

2012 ◽  
Vol 22 (1) ◽  
pp. 15-24 ◽  
Author(s):  
Christina Deatcu ◽  
Thorsten Pawletta

Author(s):  
Katrina Burgess

This book examines state–migrant relations in four countries with a long history of migration, regime change, and democratic fragility: Turkey, the Dominican Republic, Mexico, and the Philippines. It uses these cases to develop an integrative theory of the interaction between “diaspora-making” by states and “state-making” by diasporas. Specifically, it tackles three questions: (1) Under what conditions and in what ways do states alter the boundaries of political membership to reach out to migrants and thereby “make” diasporas? (2) How do these migrants respond? (3) To what extent does their response, in turn, transform the state? Through historical case narratives and qualitative comparison, the book traces the feedback loops among migrant profiles, state strategies of diaspora-making, party transnationalization, and channels of migrant engagement in politics back home. The analysis reveals that most migrants follow the pathways established by the state and thereby act as “loyal” diasporas but with important deviations that push states to alter rules and institutions.


2019 ◽  
Vol 46 (7) ◽  
pp. 3278-3284 ◽  
Author(s):  
Fatima Padilla‐Cabal ◽  
Peter Kuess ◽  
Dietmar Georg ◽  
Hugo Palmans ◽  
Lukas Fetty ◽  
...  

2011 ◽  
Vol 56 (24) ◽  
pp. 7725-7735 ◽  
Author(s):  
Xiaodong Zhang ◽  
Wei Liu ◽  
Yupeng Li ◽  
Xiaoqiang Li ◽  
Michelle Quan ◽  
...  

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