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  • 1
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    The Financial Crisis and the Systemic Failure of the Economics Profession (2009)
    In:  Critical review: a journal of politics and society
    Details
    Publication Date: 2023-07-18
    Description: Economists not only failed to anticipate the financial crisis; they may have contributed to it — with risk and derivatives models that, through spurious precision and untested theoretical assumptions, encouraged policy makers and market participants to see more stability and risk sharing than was actually present. Moreover, once the crisis occurred, it was met with incomprehension by most economists because of models that, on the one hand, downplay the possibility that economic actors may exhibit highly interactive behavior; and, on the other, assume that any homogeneity will involve economic actors sharing the economist’s own putatively correct model of the economy, so that error can stem only from an exogenous shock. The financial crisis presents both an ethical and an intellectual challenge to economics, and an opportunity to reform its study by grounding it more solidly in reality.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 2
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    Desert Soils in Lower Wadi Howar (2007)
    Leidorf
    Details
    Publication Date: 2021-03-29
    Description: The analysis of desert soils near archaeological sites allowed new insights in the environmental and living conditions of the early inhabitants of the Wadi Howar (NW Sudan) and their interactions with their environment. It also provided us with more information about the soil genesis in arid regions. Further studies should concentrate on dating the described indicators of a more humid climate in the eastern Sahara during the Holocene.
    Description: Begleitende bodenkundliche Studien im Rahmen archäologischer Untersuchungen zur Besiedelungsgeschichte des Nordwest-Sudans im Holozän
    Description: The field work was possible within the scope of the Sonderforschungsbereich 389 ACACIA (Arid Climate Adaption and Cultural Innovation in Africa) of the University of Cologne, sub-project A2 »Wadi Howar: Siedlungsraum und Verkehrsweg am Südrand der Libyschen Wüste.« This project owes its funding to the Deutsche Forschungsgemeinschaft (DFG ).
    Description: research
    Keywords: 551 ; VP 400 ; VOA 000 ; TWC 500 ; VPO 000 ; VOI 230 ; Aride Regionen {Bodenkunde} ; Bodenuntersuchung, Bodenanalyse ; Klimaschwankungen und Klimaänderungen im Quartär ; Westafrika, Sudan und Guinealänder {Bodenkunde} ; Salzböden, Wüstenböden ; Sudan ; Archaeology ; climate change ; human impact ; Sudan 〈Nordwest〉 ; Wadi Howar ; Archäologische Stätte ; Wüstenboden ; Holozän ; Klimaänderung ; 38.61 ; 38.69 ; 38.19
    Language: English
    Type: article , publishedVersion
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  • 3
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    Thermal properties of gas hydrate bearing sediments and effects of phase transitions on the transport of heat deduced from temperature logging at Mallik, NWT, Canada (2005)
    GFZ, Helmholtz-Zentrum
    Details
    Publication Date: 2023-08-29
    Description: Detailed knowledge about the thermal properties of rocks containing gas hydrate is required in order to quantify processes involving the formation and decomposition of gas hydrate in nature. This work investigates the influence of methane hydrate on the transport of heat in hydrate-bearing rocks. Both the thermal conductivity of gashydrate bearing sediments and the thermal effects of phase transitions are analyzed. In the framework of the Mallik 2002 program three wells penetrating a continental gas hydrate occurrence under permafrost were successfully equipped with permanent fiberoptic distributed temperature sensing cables. Temperature data were collected over a period of 21 months after completion of the wells. The analysis of the disturbed well temperatures after drilling revealed a strong effect of phase transitions on temperature changes. For the first time, the effects of induced temperature changes within a gas hydrate deposit were monitored in-situ. The resulting temperature gradient anomalies could be successfully utilized to determine the base of the gas hydrate occurrences and the permafrost layer at about 1103-1104±3.5 m and 599-604±3.5 m below ground level respectively. At the end of the 21-month observation period, the well temperature returned close to equilibrium with the formation temperature. At the base of the gas hydrate occurrences a temperature of 12.3 ◦C was measured, which is about 0.7 K below the stability temperature predicted by thermodynamic calculations considering a pressure gradient of 10.12 kPa m〈sup〉−1〈/sup〉 and a sea-water salinity of 35 ppt. Under the stated conditions, the base of the stability zone of methane hydrate at Mallik would lie at about 1140 m below ground level. Thermal conductivity profiles were calculated from the geothermal data as well as from a petrophysical model derived from the available logging data and application of mixing-law models. The results indicate, that variations of thermal conductivity are mainly lithologically controlled with a minor influence from hydrate saturation. The results of the geometric mean model showed the best agreement to the thermal conductivity profiles derived from geothermal data. Average thermal conductivity values of the hydrate-bearing intervals range between 2.35 W m〈sup〉−1〈/sup〉 K〈sup〉−1〈/sup〉 and 2.77 W m〈sup〉−1〈/sup〉 K〈sup〉−1〈/sup〉 . A simplified numerical model of conductive heat flow was set up in order to assess the temperature effect of phase transitions within the gas hydrate bearing strata. Within the model the mobilization of latent heat during the phase transition was considered (enthalpy method), taking into account the stability conditions for methane hydrate at Mallik (pressure, temperature, pore fluid and gas phase composition) as well as effects of hydrate decomposition on the thermal rock properties. The modelling results indicate, that the regeneration of hydrate after the recovery of stability conditions is inhibited.
    Description: thesis
    Keywords: ddc:551 ; gas hydrate
    Language: English
    Type: doc-type:book , publishedVersion
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  • 4
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    On the Relation between Subglacial Tills and the Substratum in Western Allgäu (Germany) (1993)
    Geozon Science Media
    Details
    Publication Date: 2022-08-05
    Description: Korngrößen-, Kies- und Schwermineralanalysen würmzeitlicher Grundmoränen-Ablagerungen des Rheingletschers im baden-württembergischen Alpenvorland zeigen einen meist relativ niedrigen Einfluß des aus Molasse bestehenden Substrats auf die Zusammensetzung dieser Sedimente. Auf Grund theoretischer Überlegungen und großmorphologischer Beobachtungen wird geschlossen, daß auch die Aufnahme präexistierender quartärer Ablagerungen untergeordnet war und daß die Petrographie der Moränen-Ablagerungen hauptsächlich bestimmt wird vom während der letzten Vorland-Vergletscherung vom Rheingletscher ins Vorland transportierten Schutt.
    Description: research
    Keywords: ddc:551.7
    Language: English
    Type: doc-type:article , publishedVersion
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  • 5
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    Miscellanea Palaeontologica 3 (1992)
    Fachbereich Geowissenschaften, FU Berlin, Berlin
    In:  Herausgeberexemplar
    Details
    Publication Date: 2024-04-17
    Description: Prof. Dr. B. KREBS zum 60. Geburtstag. ... 3 ; Inhalt. ... 7 ; HAHN, G. & HAHN, R.: Nachweis des Septomaxillare bei Pseudobolodon krebsi n. sp. (Multituberculata) aus dem Malm Portugals. ... 9 ; BONAPARTE, J.F.: Approach to the Significance of the Late Cretaceous Mammals of South America. ... 31 ; KOENIGSWALD, W. von: Differenzierung im Zahnschmelz der Marsupialia im Vergleich zu den Verhältnissen bei den Placentalia (Mammalia). ... 45 ; STORCH, G. & MARTIN, T.: Eomanis krebsi, ein neues Schuppentier aus dem Mittel-Eozän der Grube Messel bei Darmstadt (Mammalia: Pholidota).... 83 ; ROTHAUSEN, K.: Die Schritte der Tetrapoden in die Meere des frühen Känozoikums. ... 99 ; FAHLBUSCH, V.: Fossile Kleinsäuger - gerät ihre Erforschung in die Sackgasse? ... 113 ; BUFFETAUT, E.: The significance of dinosaur remains in marine sediments: an investigation based on the French record. ... 125 ; RICHTER, A.: Der problematische Lacertilier llerdaesaurus (Reptilia, Squamata) aus der Unter-Kreide von Una und Galve (Spanien). ... 135 ; ZINKE, J. & RAUHUT, O.: Small theropods (Dinosauria, Saurischia) from the Upper Jurassic and Lower Cretaceous of the Iberian Peninsula. ... 163 ; RAUHUT, O. & KRIWET, J.: Teeth of a big Theropod Dinosaur from Porto das Barcas (Portugal).... 179 ; KOHRING, R. & REITNER, J.: Zur Eischalenstruktur von Varanus komodoensis OuwENS 1912. ... 187 ; LiLLEGRAVEN, J. A.: Age of upper reaches of Hanna Formation, northern Hanna Basin, south-central Wyoming. ... 203 ; WERNER, C.: Die kontinentale Wirbeltierfauna aus der unteren Oberkreide des Sudan (Wadi Milk Formation). ... 221 ; HEINRICH, W.-D.: Biostratigraphische Aussagen der Säugetierpaläontologie zur Alterstellung pleistozäner Travertinfundstätten in Thüringen. ... 251 ; FECHNER, G.: Der 'mitteloligozäne’ Septarienton bei Bad Freienwalde (nordöstl. Mark Brandenburg) und seine Dinoflagellaten-Zysten-Flora. ... 269 ; FECHNER, G.: Phytoplankton aus ästuarinen Ablagerungen des Miozäns der Bohrung "Groß-Apenburg" (Altmark). ... 283 ; MEHL, D., REITNER, J. & REISWIG, H.M.: Soft tissue organization of the deep water hexactinellid Schaudinnia arctica SCHULZE, 1900 from the Arctic Seamount Vesterisbanken (Central Greenland Sea). ... 301 ; MEHL, D. & ERDTMANN, B.-D.: Sanshapentella dapingi n.gen.n.sp.- a new hexactinellid sponge from the Early Cambrian (Tommotian) of China. ... 315 ; KEUPP, H. & ILG, A.: Paläopathologische Nachlese zur Ammoniten-Fauna aus dem Ober-Callovium der Normandie. ... 321 ; BANDEL, K. & RiEDEL F.: Classification of fossil and Recent Calyptraeoidea (Caenogastropoda) with a discussion on neomesogastropod phylogeny. ... 329 ; BECKER, R.T. & SCHREIBER, G.: Zur Trilobiten-Stratigraphie im Letmather Famennium (nördliches Rheinisches Schiefergebirge). ... 369 ; KOHRING, R. & SCHREIBER, G.: 'Latex-Micro-Molding' als neue Untersuchungsmethode von Bemstein-Inklusen - Vorläufige Mitteilung. ... 389 ; REITNER, J.: Mikrobialith-Porifera-Fazies eines Exogyren/Korallen-Patchreefs des Oberen Korallenooliths im Steinbruch Langenberg bei Oker (Niedersachsen). ... 397 ; MATYSZKIEWICZ, J.: Remarks on the Deposition of Pseudonodular Limestones in the Cracow Area (Oxfordian, Southern Poland). ... 419 ; BARON-SZABO, R.: Palökologie von nordspanischen Korallen des Urgon (Playa de Laga, Prov. Guemica). ... 441 ; SCHLÜTER, T.: Zur Verbreitung, Fazies und Stratigraphie der Karoo in Uganda. ... 453 ; KEUPP, H., BELLAS, S.M., FRYDAS, D. & KOHRING, R.: Aghia Irini, ein Neogenprofil auf der Halbinsel Gramvoüssa/NW-Kreta. ... 469 ; FRYDAS, D.: Stratigraphie und Taxonomie von Silicoflagellaten aus Diatomiten des Ober-Miozän von Zentral-Kreta (Griechenland). ... 483 ; FRYDAS, D.: Bericht über ein neues Silicoflagellaten-Vorkommen aus dem Piacenzium von Kreta, Griechenland. ... 495 ; RÖPSTORF, P. & REITNER, J.: Morphologie einiger Süßwasserporifera (Baikalospongia bacillifera, Lubomirskia baicalensis, Swartschewskia papyraced) des Baikal-Sees (Sibirien, Rußland.). ... 507 ; GLOY, U.: Bibliographie Institut für Paläontologie 1993. ... 527 ;
    Description: thesis
    Description: DFG, SUB Göttingen
    Keywords: ddc:560 ; Paläontologie
    Language: German , English
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  • 6
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    The difference between pollen types and plant taxa: a plea for clarity and scientific freedom (2007)
    Geozon Science Media
    Details
    Publication Date: 2024-02-28
    Description: Dieser Artikel diskutiert den Charakter von Pollentypen. Wir argumentieren, dass Pollentypen und Pflanzentaxa komplett unterschiedliche Entitäten (morphologische bzw. taxonomische) sind, und deswegen unterschiedlich behandelt und dargestellt werden sollten. Allgemeine Probleme der konventionellen Nomenklatur von Pollentypen werden anhand von Beispielen aus der europäischen palynologischen Praxis illustriert. Wir plädieren für Deutlichkeit in der Nomenklatur von Pollentypen und für die wissenschaftliche Freiheit, ‘unkonventionelle‘ Methoden zu benutzen, um Verwirrung zu vermeiden.
    Description: research
    Keywords: ddc:551.7 ; palynological methods ; pollen morphology ; pollen type nomenclature
    Language: English
    Type: doc-type:article , publishedVersion
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