Auflistung nach Titel
Anzeige der Dokumente 196-215 von 6879
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Acceleration and spatial diffusion of galactic cosmic rays
(Univ. Bochum, 2005)In the present work analytical solutions of the transport equation for hadronic cosmic rays are calculated. With these, it is possible for the first time to fit the energy spectra of the cosmic protons measured at the ... -
Accessories in Kaiserstuhl carbonatites and related rocks as accurate and faithful recorders of whole rock age and isotopic composition
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; ; ; (International Journal of Earth Sciences, 2021-12-09)
The accessories perovskite, pyrochlore, zirconolite, calzirtite and melanite from carbonatites and carbonate-rich foidites from the Kaiserstuhl are variously suited for the in situ determination of their U–Pb ages and Sr, ... -
Accretion and emission close to supermassive black holes in quasars and AGN - Modeling the UV-X-spetrum
(Univ. Hamburg, 2006)With the last generation of X-ray satellites, such as XMM-Newton and Chandra, our knowledge about the X-ray properties of Active Galactic Nuclei (AGN) has greatly improved. Detailed spectroscopy and long-term observations ... -
Accretion, winds and jets - high-energy emission from young stellar objects
(Univ. Hamburg, 2009)This thesis deals with the high-energy emission from young stellar objects, which are on the one hand still actively accreting from their disk, and on the other hand are no longer deeply obscured by their natal cloud. Stars ... -
Accumulation of germanium (Ge) in plant tissues of grasses is not solely driven by its incorporation in phytoliths
(Biogeochemistry, 2020-02-20)Ge/Si ratios of plant phytoliths have been widely used to trace biogeochemical cycling of Si. However, until recently, information on how much of the Ge and Si transferred from soil to plants is actually stored in phytoliths ... -
Accuracy of fully coupled and sequential approaches for modeling hydro- and geomechanical processes
; ; ; (Computational Geosciences, 2020-07-12)
Subsurface flow and geomechanics are often modeled with sequential approaches. This can be computationally beneficial compared with fully coupled schemes, while it requires usually compromises in numerical accuracy, at ... -
Accuracy of sand beach topography surveying by drones and photogrammetry
; ; ; ; (Geo-Marine Letters, 2020-01-23)
Beaches are characterized by high morphodynamic activity, and high-frequency measurements are needed to understand their states and rates of change. Ideally, beach survey methods should be at once accurate, rapid and ... -
Ackerbauern und mobile Tierhalter in Zentral- und Nord-Benin - Landnutzungskonflikte und Landesentwicklung
(Reimer Verlag Berlin, 2002)Die Verschlechterung der Beziehungen zwischen mobilen Tierhaltern und sesshaften Gruppen ist in vielen Regionen der Dritten Welt feststellbar. Die vorliegende Fallstudie zeigt den Prozess und die Ursachen der Veränderungen ... -
Added value of an atmospheric circulation pattern‐based statistical downscaling approach for daily precipitation distributions in complex terrain
; ; ; (International Journal of Climatology, 2023-06-10)
Abstract Reliable prediction of heavy precipitation events causing floods in a world of changing ...
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Adoption of multiple sustainable land management practices among irrigator rural farm households of Ethiopia
; ; (Land Degradation & Development, 2021-09-29)
Using a household and plot‐level survey conducted in Ethiopia, this study analyses the difference in farmers' adoption of sustainable land management (SLM) practices between their rainfed and irrigated plots. The paper ... -
Advanced algorithms of inversion of GPS radio limb sounding data
(Scientific Technical Report / Geoforschungszentrum Potsdam; 2001, 06) -
Advanced methods for analysing and modelling multivariate palaeoclimatic time series
(Univ. Potsdam, 2007)The separation of natural and anthropogenically caused climatic changes is an important task of contemporary climate research. For this purpose, a detailed knowledge of the natural variability of the climate during warm ... -
Advanced methods to investigate hydro‐morphological processes in open‐water environments
; (Earth Surface Processes and Landforms, 2021-05-06)
Hydro‐morphology describes the interactions between water and sediments in fluvial systems and the corresponding processes across all spatial and temporal scales. The results are natural and anthropogenically influenced ... -
Advances in New Zealand's Tephrochronostratigraphy Using Marine Drill Sites: The Neogene
; ; ; ; ; (Geochemistry, Geophysics, Geosystems, 2023-07-27)
Abstract Three volcanic arcs have been the source of New Zealand's volcanic activity since the ...
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Advances in understanding calcite varve formation: new insights from a dual lake monitoring approach in the southern Baltic lowlands
; Dräger, Nadine; ; ; Pinkerneil, Sylvia; ; Lindemann, Christin; ; Brademann, Brian; Kaszubski, Michał; ; ; ; ; (Boreas, 2021-02-09)
We revise the conceptual model of calcite varves and present, for the first time, a dual lake monitoring study in two alkaline lakes providing new insights into the seasonal sedimentation processes forming these varves. ... -
Aeolian sedimentation in the Rhine and Main area from the Late Glacial until the Mid-Holocene
Tolksdorf, Johann Friedrich;; ; Klasen, Nicole; Schneider, Birgit; Masberg, Peter (E&G – Quaternary Science Journal; Vol.59, No. 1-2)
Äolische Sedimente (sandiger Löss, Flugsand) wurden durch pedologische und geochronologische Methoden (OSL) mit dem Ziel untersucht, hieraus Aussagen zur stratigraphischen Abfolge und zum Ablagerungsalter zu gewinnen und ... -
Aerobic methanotrophy within the pelagic redox-zone of the Gotland Deep (central Baltic Sea)
Schmale, O.; Blumenberg, M.; Kießlich, K.; Jakobs, G.; Berndmeyer, C.; Labrenz, M.;; Rehder, G. (Biogeosciences, 2012-12-05)
Water column samples taken in summer 2008 from the stratified Gotland Deep (central Baltic Sea) showed a strong gradient in dissolved methane concentrations from high values in the saline deep water (max. 504 nM) to ... -
Aerosol-Cloud-Precipitation Interactions in the Context of Convective Self-Aggregation
; (Journal of Advances in Modeling Earth Systems, 2019)
We investigate the sensitivity of self-aggregated radiative-convective-equilibrium cloud-resolving model simulations to the cloud condensation nuclei (CCN) concentration. Experiments were conducted on a long (2,000-km × 120-km) ... -
After 100 years: a detailed view of an eumalacostracan crustacean from the Upper Jurassic Solnhofen Lagerstätte with raptorial appendages unique to Euarthropoda
; ; Schweigert, Günter; ; (Lethaia, 2020)
The Solnhofen Konservat-Lagerstätte yields a great number of remarkably preserved fossils of eumalacostracan crustaceans that help us understand the early radiation of several groups with modern representatives. One fossil ...
