171,095 research outputs found
Highly conductive ion tracks in tetrahedral amorphous carbon by irradiation with 30 MeV C-60 projectiles
No full textElectrically conducting ion tracks are produced when high-energy heavy ions pass through a layer of tetrahedral amorphous carbon (ta-C). The tracks are embedded in the insulating ta-C matrix and have a diameter of about 8 nm. Earlier studies showed that the electrical currents through individual tracks produced with Au and U projectiles exhibit rather large track-to-track fluctuations. In striking contrast, 30 MeV C-60 cluster ions are shown to generate conducting tracks of very narrow conductivity distributions. Their current-versus-voltage curves are linear at room temperature. We also investigated ta-C films doped with B, N, Cu and Fe at a concentration of 1 or 2 at.%. In particular, Cu-and Fe-doped samples show increased ion track conductivity.DFG [Ho1125/17-1]; BMBF [05KK4MGA/9]Open-Access-Publikationsfonds 201
Exploiting SML for Experimenting with Algebraic Algorithms: The Example of p-adic Lifting
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Progress in Economics
No full textThe Author discusses the relevance of studying the progress made in economic research and how to assess the existence of different models
Agricultural Productivity and Fertility Rates: Evidence from the Oil Palm Boom in Indonesia
No full textWe analyze the link between agricultural productivity growth and fertility rates, using the oil palm boom in Indonesia as an empirical setting. We find consistent negative effects of oil palm expansion on fertility during the period 1996-2016. This finding appears to be linked to rising farm profits that led to consumption growth, an expansion of the non-agricultural sector, increasing wage returns to education and higher school enrollment. Together, these findings suggest that agricultural productivity growth can play an important role in accelerating the fertility transition, as long as the economic benefits are large enough to translate into local economic development
Germany at the Poles: Exploring Legitimacy
No full textWingens J, Holste S, Gehrke C. Germany at the Poles: Exploring Legitimacy. The Arctic Institute Knowledge Production Series 2025. 27.05.2025
Eine mikroökonomische Analyse des Raubkopierens von Informationsgütern - Ein Marktmodell
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Eine mikroökonomische Analyse des Raubkopierens von Informationsgütern - Ein Marktmodell
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