Refine
Year of publication
- 2024 (2)
- 2023 (34)
- 2022 (159)
- 2021 (153)
- 2020 (309)
- 2019 (211)
- 2018 (287)
- 2017 (249)
- 2016 (216)
- 2015 (197)
- 2014 (127)
- 2013 (89)
- 2012 (61)
- 2011 (67)
- 2010 (49)
- 2009 (132)
- 2008 (68)
- 2007 (34)
- 2006 (58)
- 2005 (121)
- 2004 (113)
- 2003 (36)
- 2002 (21)
- 2001 (13)
- 2000 (13)
- 1999 (15)
- 1998 (8)
- 1997 (12)
- 1996 (8)
- 1995 (35)
- 1994 (46)
- 1993 (35)
- 1992 (39)
- 1991 (25)
- 1990 (16)
- 1989 (27)
- 1988 (21)
- 1987 (23)
- 1986 (16)
- 1985 (12)
- 1984 (15)
- 1983 (30)
- 1982 (9)
- 1981 (8)
- 1980 (10)
- 1979 (14)
- 1978 (8)
- 1977 (11)
- 1976 (7)
- 1975 (3)
- 1974 (2)
- 1973 (2)
- 1972 (1)
- 1971 (2)
- 1970 (1)
Document Type
- Postprint (3288) (remove)
Language
- English (2341)
- German (925)
- Multiple languages (11)
- French (9)
- Portuguese (1)
- Slovak (1)
Keywords
- Germany (62)
- Deutschland (44)
- Außenpolitik (35)
- European Union (35)
- USA (34)
- Europäische Union (31)
- Europe (25)
- climate change (23)
- model (22)
- diffusion (21)
Institute
- Mathematisch-Naturwissenschaftliche Fakultät (481)
- WeltTrends e.V. Potsdam (322)
- Institut für Biochemie und Biologie (287)
- Institut für Chemie (236)
- Humanwissenschaftliche Fakultät (223)
- Extern (205)
- Department Psychologie (194)
- Strukturbereich Kognitionswissenschaften (163)
- Institut für Geowissenschaften (139)
- Institut für Physik und Astronomie (137)
„Menschen benötigen Platz zum Leben.“ In dieser Erkenntnis liegt noch nichts Besonderes oder gar Aufregendes. Erst die Tatsache, dass die menschliche Bevölkerung seit jeher zunimmt, aber der zur Verfügung stehende Platz konstant bleibt bzw. die Ressourcen in ihrem Bestand sogar abnehmen, macht dieses Thema wesentlich gehaltvoller. Offensichtlich ist außerdem: „Population growth seems to affect everything but is seldom held responsible for anything.“ (McKee 2003: 10) Dies ist der Hauptgrund dafür, dass gerade die Thematik der Bevölkerungsentwicklung internationale Beachtung und Aufmerksamkeit verdient.
"Woher kommt eigentlich ...?" : Sprachberatung und Sprachgeschichte an der Universität Potsdam
(2005)
'Gelegenheitsdichtung'
(2010)
We present novel experimental evidence on the availability and the status of exhaustivity inferences with focus partitioning in German, English, and Hungarian. Results suggest that German and English focus-background clefts and Hungarian focus share important properties, (É. Kiss 1998, 1999; Szabolcsi 1994; Percus 1997; Onea & Beaver 2009). Those constructions are anaphoric devices triggering an existence presupposition. EXH-inferences are not obligatory in such constructions in English, German, or Hungarian, against some previous literature (Percus 1997; Büring & Križ 2013; É. Kiss 1998), but in line with pragmatic analyses of EXH-inferences in clefts (Horn 1981, 2016; Pollard & Yasavul 2016). The cross-linguistic differences in the distribution of EXH-inferences are attributed to properties of the Hungarian number marking system.
A new sedimentary sequence from Lago di Venere on Pantelleria Island, located in the Strait of Sicily between Tunisia and Sicily was recovered. The lake is located in the coastal infra-Mediterranean vegetation belt at 2 m a.s.l. Pollen, charcoal and sedimentological analyses are used to explore linkages among vegetation, fire and climate at a decadal scale over the past 1200 years. A dry period from ad 800 to 1000 that corresponds to the Medieval Warm Period' (WMP) is inferred from sedimentological analysis. The high content of carbonate recorded in this period suggests a dry phase, when the ratio of evaporation/precipitation was high. During this period the island was dominated by thermophilous and drought-tolerant taxa, such as Quercus ilex, Olea, Pistacia and Juniperus. A marked shift in the sediment properties is recorded at ad 1000, when carbonate content became very low suggesting wetter conditions until ad 1850-1900. Broadly, this period coincides with the Little Ice Age' (LIA), which was characterized by wetter and colder conditions in Europe. During this time rather mesic conifers (i.e. Pinus pinaster), shrubs and herbs (e.g. Erica arborea and Selaginella denticulata) expanded, whereas more drought-adapted species (e.g. Q. ilex) declined. Charcoal data suggest enhanced fire activity during the LIA probably as a consequence of anthropogenic burning and/or more flammable fuel (e.g. resinous Pinus biomass). The last century was characterized by a shift to high carbonate content, indicating a change towards drier conditions, and re-expansion of Q. ilex and Olea. The post-LIA warming is in agreement with historical documents and meteorological time series. Vegetation dynamics were co-determined by agricultural activities on the island. Anthropogenic indicators (e.g. Cerealia-type, Sporormiella) reveal the importance of crops and grazing on the island. Our pollen data suggest that extensive logging caused the local extinction of deciduous Quercus pubescens around ad1750.
1945 und die Polen
(2005)
The current series of anniversaries concerning World War II raise the question of how Poland is coming to terms with its past. The article summarises the ongoing Polish debate about the Warsaw Uprising and the changing perspectives on Polish history in society and political circles. The discussion about Poland’s view on its own past has great influence on recent foreign political relations, e.g. with Germany, the Ukraine, or Russia.
Monolithic perovskite silicon tandem solar cells can overcome the theoretical efficiency limit of silicon solar cells. This requires an optimum bandgap, high quantum efficiency, and high stability of the perovskite. Herein, a silicon heterojunction bottom cell is combined with a perovskite top cell, with an optimum bandgap of 1.68 eV in planar p-i-n tandem configuration. A methylammonium-free FA(0.75)Cs(0.25)Pb(I0.8Br0.2)(3) perovskite with high Cs content is investigated for improved stability. A 10% molarity increase to 1.1 m of the perovskite precursor solution results in approximate to 75 nm thicker absorber layers and 0.7 mA cm(-2) higher short-circuit current density. With the optimized absorber, tandem devices reach a high fill factor of 80% and up to 25.1% certified efficiency. The unencapsulated tandem device shows an efficiency improvement of 2.3% (absolute) over 5 months, showing the robustness of the absorber against degradation. Moreover, a photoluminescence quantum yield analysis reveals that with adapted charge transport materials and surface passivation, along with improved antireflection measures, the high bandgap perovskite absorber has the potential for 30% tandem efficiency in the near future.
Abstract. The Sea of Marmara, in northwestern Turkey, is a transition zone where the dextral North Anatolian Fault zone (NAFZ) propagates westward from the Anatolian Plate to the Aegean Sea Plate. The area is of interest in the context of seismic hazard of Istanbul, a metropolitan area with about 15 million inhabitants. Geophysical observations indicate that the crust is heterogeneous beneath the Marmara basin, but a detailed characterization of the crustal heterogeneities is still missing. To assess if and how crustal heterogeneities are related to the NAFZ segmentation below the Sea of Marmara, we develop new crustal-scale 3-D density models which integrate geological and seismological data and that are additionally constrained by 3-D gravity modeling. For the latter, we use two different gravity datasets including global satellite data and local marine gravity observation. Considering the two different datasets and the general non-uniqueness in potential field modeling, we suggest three possible “end-member” solutions that are all consistent with the observed gravity field and illustrate the spectrum of possible solutions. These models indicate that the observed gravitational anomalies originate from significant density heterogeneities within the crust. Two layers of sediments, one syn-kinematic and one pre-kinematic with respect to the Sea of Marmara formation are underlain by a heterogeneous crystalline crust. A felsic upper crystalline crust (average density of 2720 kgm⁻³) and an intermediate to mafic lower crystalline crust (average density of 2890 kgm⁻³) appear to be cross-cut by two large, dome-shaped mafic highdensity bodies (density of 2890 to 3150 kgm⁻³) of considerable thickness above a rather uniform lithospheric mantle (3300 kgm⁻³). The spatial correlation between two major bends of the main Marmara fault and the location of the highdensity bodies suggests that the distribution of lithological heterogeneities within the crust controls the rheological behavior along the NAFZ and, consequently, maybe influences fault segmentation and thus the seismic hazard assessment in the region.
Welchen Aufgaben soll sich die NATO zuwenden? Wo soll sie enden? Als klassisches Militärbündnis verliert sie jedenfalls an Bedeutung. Die gegenwärtige Krise der regionalen Allianz mit globaler Reichweite muss genutzt werden für eine strategische Neuausrichtung der Struktur und Funktion des Bündnisses. Die Rolle der NATO als Werkzeug für multinationale Interventionen entscheidet über die Bildung globaler Koalitionen.