Institution
University of Potsdam
Education•Potsdam, Germany•
About: University of Potsdam is a education organization based out in Potsdam, Germany. It is known for research contribution in the topics: Population & Computer science. The organization has 9629 authors who have published 26740 publications receiving 759745 citations. The organization is also known as: Universität Potsdam.
Papers published on a yearly basis
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TL;DR: From a snapshot of a quantum evolution, it can be decided whether or not a channel is consistent with a time (in)dependent Markovian evolution, for which a computable measure of "Markovianity" is introduced.
Abstract: We investigate what a snapshot of a quantum evolution--a quantum channel reflecting open system dynamics--reveals about the underlying continuous time evolution. Remarkably, from such a snapshot, and without imposing additional assumptions, it can be decided whether or not a channel is consistent with a time (in)dependent Markovian evolution, for which we provide computable necessary and sufficient criteria. Based on these, a computable measure of "Markovianity" is introduced. We discuss how the consistency with Markovian dynamics can be checked in quantum process tomography. The results also clarify the geometry of the set of quantum channels with respect to being solutions of time (in)dependent master equations.
512 citations
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TL;DR: There are discernible differences in climate impacts between 1.5 °C and 2 °C of warming as discussed by the authors, and the extent of countries' near-term mitigation ambition will determine the success of the Paris Agreement's temperature goal.
Abstract: There are discernible differences in climate impacts between 1.5 °C and 2 °C of warming. The extent of countries' near-term mitigation ambition will determine the success of the Paris Agreement's temperature goal.
510 citations
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University of Bern1, University of Tübingen2, University of Freiburg3, Technische Universität Darmstadt4, University of Ulm5, University of Münster6, Xavier University7, Smithsonian Institution8, Free University of Berlin9, Max Planck Society10, University of Würzburg11, Smithsonian Tropical Research Institute12, University of Jena13, Technische Universität München14, University of Göttingen15, Karlsruhe Institute of Technology16, University of Potsdam17
TL;DR: Biodiversity loss explained indirect effects in a region of intermediate productivity and was most damaging when land‐use objectives favoured supporting and cultural services, and functional composition shifts, towards fast‐growing plant species, strongly increased provisioning services in more inherently unproductive grasslands.
Abstract: Global change, especially land-use intensification, affects human well-being by impacting the delivery of multiple ecosystem services (multifunctionality). However, whether biodiversity loss is a major component of global change effects on multifunctionality in real-world ecosystems, as in experimental ones, remains unclear. Therefore, we assessed biodiversity, functional composition and 14 ecosystem services on 150 agricultural grasslands differing in land-use intensity. We also introduce five multifunctionality measures in which ecosystem services were weighted according to realistic land-use objectives. We found that indirect land-use effects, i.e. those mediated by biodiversity loss and by changes to functional composition, were as strong as direct effects on average. Their strength varied with land-use objectives and regional context. Biodiversity loss explained indirect effects in a region of intermediate productivity and was most damaging when land-use objectives favoured supporting and cultural services. In contrast, functional composition shifts, towards fast-growing plant species, strongly increased provisioning services in more inherently unproductive grasslands.
507 citations
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TL;DR: The competition between charge extraction and recombination is quantified by using a single parameter θ, and it is demonstrated that this parameter is directly related to the fill factor of many different bulk-heterojunction solar cells.
Abstract: Among the parameters that characterize a solar cell and define its power-conversion efficiency, the fill factor is the least well understood, making targeted improvements difficult. Here we quantify the competition between charge extraction and recombination by using a single parameter θ, and we demonstrate that this parameter is directly related to the fill factor of many different bulk-heterojunction solar cells. Our finding is supported by experimental measurements on 15 different donor:acceptor combinations, as well as by drift-diffusion simulations of organic solar cells in which charge-carrier mobilities, recombination rate, light intensity, energy levels and active-layer thickness are all varied over wide ranges to reproduce typical experimental conditions. The results unify the fill factors of several very different donor:acceptor combinations and give insight into why fill factors change so much with thickness, light intensity and materials properties. To achieve fill factors larger than 0.8 requires further improvements in charge transport while reducing recombination.
507 citations
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TL;DR: The accumulated evidence demonstrates that microsaccades serve both perceptual and oculomotor goals and although in some cases their contribution is neither necessary nor unique, micros Accades are a malleable tool conveniently employed by the visual system.
506 citations
Authors
Showing all 9969 results
Name | H-index | Papers | Citations |
---|---|---|---|
Cyrus Cooper | 204 | 1869 | 206782 |
Markus Antonietti | 176 | 1068 | 127235 |
Marc Weber | 167 | 2716 | 153502 |
Peter Capak | 147 | 679 | 70483 |
Heiner Boeing | 140 | 1024 | 92580 |
Alisdair R. Fernie | 133 | 1010 | 64026 |
Klaus-Robert Müller | 129 | 764 | 79391 |
Claudia Felser | 113 | 1198 | 58589 |
Guochun Zhao | 113 | 406 | 40886 |
Matthias Steinmetz | 112 | 461 | 67802 |
Jürgen Kurths | 105 | 1038 | 62179 |
Peter Schmidt | 105 | 638 | 61822 |
Erwin P. Bottinger | 102 | 342 | 42089 |
Knud Jahnke | 94 | 352 | 31542 |
Gerd Gigerenzer | 94 | 533 | 52356 |