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Institution

University of Bremen

EducationBremen, Germany
About: University of Bremen is a education organization based out in Bremen, Germany. It is known for research contribution in the topics: Population & Glacial period. The organization has 14563 authors who have published 37279 publications receiving 970381 citations. The organization is also known as: Universität Bremen.


Papers
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Proceedings ArticleDOI
24 Mar 2009
TL;DR: An incremental clone detection algorithm is presented, which detects clones based on the results of the previous revision's analysis, and creates a mapping between clones of one revision to the next, supplying information about the addition and deletion of clones.
Abstract: Finding, understanding and managing software clones - passages of duplicated source code - is of large interest in research and practice. There is an abundance of techniques to detect clones. However, all these techniques are limited to a single revision of a program. When the code changes, the analysis must be run again from scratch even though only small parts may have changed. In this paper, we present an incremental clone detection algorithm, which detects clones based on the results of the previous revision's analysis. Moreover, it creates a mapping between clones of one revision to the next, supplying information about the addition and deletion of clones. Our empirical results demonstrate that the incremental technique requires considerably less time than a non-incremental approach if the changes do not exceed a certain fraction of the source code. An incremental analysis is useful for on-the-fly detection and evolutionary clone analysis. On-the-fly detection may be integrated in an IDE and allows to re-run clone detection immediately when a programmer saves his changes or even while he/she is typing. In evolutionary clone analysis, many revisions of a system need to be analyzed in order to understand how clones evolve.

213 citations

Journal ArticleDOI
TL;DR: In this article, the impact of particle precipitation on the chemical composition of the atmosphere has been studied, and there are a number of observations as well as model studies concerning especially the auroral impact and large solar particle events.
Abstract: Precipitation of energetic particles into the atmosphere greatly disturbs the chemical composition from the upper stratosphere to the lower thermosphere. Most important are changes to the budget of atmospheric nitric oxides (NOx = N, NO, NO2) and to atmospheric reactive hydrogen oxides (HOx = H, OH, HO2), which both contribute to ozone loss in the stratosphere and mesosphere. The impact of energetic particle precipitation on the chemical composition of the atmosphere has been studied since the 1960s, and there are a number of observations as well as model studies concerning especially the auroral impact and large solar particle events. Changes to the NOx budget due to energetic particle precipitation can be quite long-lived during polar winter and can then be transported down into the lower mesosphere and stratosphere, where NOx is one of the main participants in catalytic ozone destruction. Energetic particle precipitation can also affect temperatures and dynamics of the atmosphere from the source region down to the stratosphere and possibly even down to the surface, due to a coupling of chemical composition changes affecting atmospheric heating and cooling rates, the mean circulation, and wave propagation and breaking. Thus, energetic particle precipitation impacts have been implemented in chemistry-climate models reaching from the surface up to the mesosphere or lower thermosphere. However, there are still a number of open questions in the theoretical description of the energetic particle precipitation impact; the most important are uncertainties in the formation rate of different NOx species due to energetic particle precipitation, and the complex coupling between chemical changes, atmospheric heating and cooling rates, and atmospheric dynamics.

213 citations

Journal ArticleDOI
TL;DR: Results of the author’s studies on the effect of the pesticide Aldicarb on the Gamasina are summarized, which document various patterns of population development following pesticide application.

212 citations

Journal ArticleDOI
TL;DR: The sedimentary and biogeographic history of the tropical siliciclastic Sunda Shelf is reviewed in this article, where the authors describe particular depositional segments as part of a genetic succession of zones from land to the deep sea based on literature data, field observations, and calculation of hydro-isostatic adjustment effects on changing relative sea level.

212 citations

Journal ArticleDOI
TL;DR: In this article, satellite-retrieved summertime NO2 columns and bottom-up emission estimates show larger decreases in the Ohio River Valley, where power plants dominate NO2 emissions, than in the northeast U.S. urban corridor.
Abstract: [1] Nitrogen oxide (NOx) emissions resulting from fossil fuel combustion lead to unhealthy levels of near-surface ozone (O3). One of the largest U.S. sources, electric power generation, represented about 25% of the U.S. anthropogenic NOx emissions in 1999. Here we show that space-based instruments observed declining regional NOx levels between 1999 and 2005 in response to the recent implementation of pollution controls by utility companies in the eastern U.S. Satellite-retrieved summertime nitrogen dioxide (NO2) columns and bottom-up emission estimates show larger decreases in the Ohio River Valley, where power plants dominate NOx emissions, than in the northeast U.S. urban corridor. Model simulations predict lower O3 across much of the eastern U.S. in response to these emission reductions.

212 citations


Authors

Showing all 14961 results

NameH-indexPapersCitations
Roger Y. Tsien163441138267
Klaus-Robert Müller12976479391
Ron Kikinis12668463398
Ulrich S. Schubert122222985604
Andreas Richter11076948262
Michael Böhm10875566103
Juan Bisquert10745046267
John P. Sumpter10126646184
Jos Lelieveld10057037657
Michael Schulz10075950719
Peter Singer9470237128
Charles R. Tyler9232531724
John P. Burrows9081536169
Hans-Peter Kriegel8944473932
Harald Haas8575034927
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
2023343
2022709
20212,106
20202,309
20192,191
20181,965