University of Potsdam

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.

Risk Attitudes of Nascent Entrepreneurs: New Evidence from an Experimentally-Validated Survey

Abstract: The influence of risk aversion on the decision to become self-employed is a much discussed topic in the entrepreneurial literature. Conventional wisdom asserts that the role model of an entrepreneur requires to make risky decisions in uncertain environments and hence that more risk-averse individuals are less likely to become an entrepreneur. Empirical tests of this assumption are scarce however, mainly because reliable measures for risk-aversion are not available. We base our analysis on the most recent waves of the German Socio-Economic Panel (SOEP) which allow us to use experimentally-validated measures of risk attitudes. Most importantly and in contrast to previous research, we are able to examine whether the decision of starting a business is influenced by objectively measurable risk attitudes at the time when this decision is made. Our results show that in general individuals with lower risk aversion are more likely to become self-employed. Sensitivity analysis reveals, however, that this is true only for people coming out of regular employment, whereas for individuals coming out of unemployment or inactivity risk attitudes do not seem to play a role in the decision process.

Scenarios of freshwater fish extinctions from climate change and water withdrawal

Abstract: Reductions in river discharge (water availability) like those from climate change or increased water withdrawal, reduce freshwater biodiversity. We combined two scenarios from the Intergovernmental Panel for Climate Change with a global hydrological model to build global scenarios of future losses in river discharge from climate change and increased water withdrawal. Applying these results to known relationships between fish species and discharge, we build scenarios of losses (at equilibrium) of riverine fish richness. In rivers with reduced discharge, up to 75% (quartile range 4–22%) of local fish biodiversity would be headed toward extinction by 2070 because of combined changes in climate and water consumption. Fish loss in the scenarios fell disproportionately on poor countries. Reductions in water consumption could prevent many of the extinctions in these scenarios.

Landslide erosion controlled by hillslope material

Abstract: Landslide erosion is a primary control of landscape relief. A wide-ranging analysis of landslide geometry shows that soil-based landslides are generally less voluminous than landslides that involve the failure of bedrock, and provides refined metrics for estimating the volume of a landslide from the area of the failure

Intrinsic non-radiative voltage losses in fullerene-based organic solar cells

Abstract: The conversion efficiency of organic solar cells suffers from their low open-circuit voltages. Here, the authors expose a link between electron-vibrations coupling and non-radiative recombinations, derive a new limit for the efficiency of organic solar cells, and redefine their optimal optical gap.