Institution
Johannes Kepler University of Linz
Education•Linz, Oberösterreich, Austria•
About: Johannes Kepler University of Linz is a education organization based out in Linz, Oberösterreich, Austria. It is known for research contribution in the topics: Thin film & Quantum dot. The organization has 6605 authors who have published 19243 publications receiving 385667 citations.
Papers published on a yearly basis
Papers
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TL;DR: A scattering theory for grazing incidence diffraction is derived for the case of highly strained, uncapped nanostructures in this article, which allows us to determine shape, strain fields, and interdiffusion in semiconductor quantum dots grown in the Stranski\char21{}Krastanov mode.
Abstract: We give a detailed account of an x-ray diffraction technique which allows us to determine shape, strain fields, and interdiffusion in semiconductor quantum dots grown in the Stranski\char21{}Krastanov mode. A scattering theory for grazing incidence diffraction is derived for the case of highly strained, uncapped nanostructures. It is shown that strain resolution can be achieved by ``decomposing'' the dots in their iso-strain areas. For a selected iso-strain area, it is explained how lateral extent, height above the substrate and radius of curvature can be determined from the intensity distribution around a surface Bragg reflection. The comparison of intensities from strong and weak reflections reveals the mean material composition for each strain state. The combination of all these strain resolved functional dependences yields tomographic images of the dots showing strain field and material composition.
134 citations
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Johannes Kepler University of Linz1, Temple University2, University of British Columbia3, University of Arkansas4, Indiana University5, Drexel University6, University of Minnesota7, University of Graz8, Zeppelin University9, Graz University of Technology10, Georgia State University11, University of Liechtenstein12, University of Bonn13
134 citations
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TL;DR: In this article, the authors used currency demand and DYMIMIC approaches to estimate the size of the shadow economy in 22 Transition and 21 OECD countries over 2001/2002.
Abstract: Using the currency demand and DYMIMIC approaches estimates are presented about the size of the shadow economy in 22 Transition and 21 OECD countries. Over 2001/2002 in 21 OECD countries is the average size of the shadow economy (in percent of official GDP) 16.7% of "official" GDP and of 22 Transition countries 38.0%. The average size of the shadow economy labor force (in percent of the population of working age) of the year 1998/99 in 7 OECD-countries is 15.3% and in 22 Transition countries is 30.2%. An increasing burden of taxation and social security contributions combined with rising state regulatory activities are the driving forces for the growth and size of the shadow economy (labor force).
134 citations
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01 Sep 2010
TL;DR: Gessel walks are lattice walks in the quarter plane as discussed by the authors which start at the origin of the set and consist only of steps chosen from the set, and they are an algebraic function.
Abstract: Gessel walks are lattice walks in the quarter plane $\set N^2$ which start at the origin $(0,0)\in\set N^2$ and consist only of steps chosen from the set $\{\leftarrow,\swarrow,
earrow,\to\}$. We prove that if $g(n;i,j)$ denotes the number of Gessel walks of length $n$ which end at the point $(i,j)\in\set N^2$, then the trivariate generating series $G(t;x,y)=\sum_{n,i,j\geq 0} g(n;i,j)x^i y^j t^n$ is an algebraic function.
134 citations
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TL;DR: This survey article presents difference field algorithms for symbolic summation that can be solved completely automatically for large scale summation problems for the evaluation of Feynman diagrams in QCD (Quantum ChromoDynamics).
Abstract: In this survey article we present difference field algorithms for symbolic summation. Special emphasize is put on new aspects in how the summation problems are rephrased in terms of difference fields, how the problems are solved there, and how the derived results in the given difference field can be reinterpreted as solutions of the input problem. The algorithms are illustrated with the Mathematica package Sigma by discovering and proving new harmonic number identities extending those from Paule and Schneider, 2003. In addition, the newly developed package EvaluateMultiSums is introduced that combines the presented tools. In this way, large scale summation problems for the evaluation of Feynman diagrams in QCD (Quantum ChromoDynamics) can be solved completely automatically.
134 citations
Authors
Showing all 6718 results
Name | H-index | Papers | Citations |
---|---|---|---|
Wolfgang Wagner | 156 | 2342 | 123391 |
A. Paul Alivisatos | 146 | 470 | 101741 |
Klaus-Robert Müller | 129 | 764 | 79391 |
Christoph J. Brabec | 120 | 896 | 68188 |
Andreas Heinz | 108 | 1078 | 45002 |
Niyazi Serdar Sariciftci | 99 | 591 | 54055 |
Lars Samuelson | 96 | 850 | 36931 |
Peter J. Oefner | 90 | 348 | 30729 |
Dmitri V. Talapin | 90 | 303 | 39572 |
Tomás Torres | 88 | 625 | 28223 |
Ramesh Raskar | 86 | 670 | 30675 |
Siegfried Bauer | 84 | 422 | 26759 |
Alexander Eychmüller | 82 | 444 | 23688 |
Friedrich Schneider | 82 | 554 | 27383 |
Maksym V. Kovalenko | 81 | 360 | 34805 |