3,909 research outputs found

    Internal structure and origin of the double reefs of North Bohol and the Olango reef flat (Philippines)

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    Nine holes were drilled with a submersible hydraulic drill into the slopes and reef flats of the Caubyna and Calituban reefs as well as of Olango Flat. The maximum depth of core penetration was 11 m. 14C ages showed that the Caubyan and Caltituban reefs were formed within the last 6,000 years. Corals settled on a pre-existing relief prallel to the island of Bohol, building a framework for other carbonate-producing organisms. The reef flat south of Olango has a different structure. Formation took place during a Pleistocene high sea level, e.g. 125,000 years ago

    Rögnvaldur Hannesson, Ecofundamentalism: A Critique of Extreme Environmentalism

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    Abstract. Professor Rögnvaldur Hannesson, an authority on natural resource management, has written a well-argued, even if polemical, book against ecofundamentalism, which, for him, puts nature before man. He cogently discusses the difficulties in applying notions of sustainability and biodiversity to the human condition and suggests that in the foreseeable future mankind should continue mainly to use fossil fuels as energy sources. Hannesson regards models of global warming as scientific, but as too uncertain for mankind radically to alter its way of life.Keywords. Environmental economics, Resource economics.JEL. Q20, Q30, Q50

    Möglichkeiten und Grenzen der Online-Marktforschung

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    Mit der Verbreitung des Internets ist fĂŒr die klassische Marktforschung eines weites Feld neuer Anwendungsbereiche und Instrumente entstanden. Einerseits ist das Internet selber zum begehrten Untersuchungsobjekt geworden. Anderseits eröffnet das Internet aufgrund seiner medienimmanenten Vorteile wie AlokalitĂ€t, AsynchronitĂ€t und Ökonomie völlig neue Möglichkeiten in bezug auf die Datenerhebung und -auswertung. Ziel des vorliegenden Beitrags ist es, Möglichkeiten, aber auch Grenzen online-basierter Marktforschung aufzuzeigen. So werden zunĂ€chst ausgewĂ€hlte Internet-Dienste, die als Medien im Rahmen der Marktforschung fungieren können, vorgestellt sowie Instrumente und Anwendungsbereiche der Online-Marktforschung nĂ€her beleuchtet. Darauf aufbauend werden die mit Online-Marktforschung verbundenen Besonderheiten und Problembereiche erörtert, gefolgt von einem abschließenden Fazit

    A mechanism for exocyst-mediated tethering via Arf6 and PIP5K1C-driven phosphoinositide conversion

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    Polarized trafficking is necessary for the development of eukaryotes and is regulated by a conserved molecular machinery. Late steps of cargo delivery are mediated by the exocyst complex, which integrates lipid and protein components to tether vesicles for plasma membrane fusion. However, the molecular mechanisms of this process are poorly defined. Here, we reconstitute functional octameric human exocyst, demonstrating the basis for holocomplex coalescence and biochemically stable subcomplexes. We determine that each subcomplex independently binds to phosphatidylinositol 4,5-bisphosphate (PI(4,5)P(2)), which is minimally sufficient for membrane tethering. Through reconstitution and epithelial cell biology experiments, we show that Arf6-mediated recruitment of the lipid kinase PIP5K1C rapidly converts phosphatidylinositol 4-phosphate (PI(4)P) to PI(4,5)P(2), driving exocyst recruitment and membrane tethering. These results provide a molecular mechanism of exocyst-mediated tethering and a unique functional requirement for phosphoinositide signaling on late-stage vesicles in the vicinity of the plasma membrane

    Sharing emotions and space - empathy as a basis for cooperative spatial interaction

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    Boukricha H, Nguyen N, Wachsmuth I. Sharing emotions and space - empathy as a basis for cooperative spatial interaction. In: Kopp S, Marsella S, Thorisson K, Vilhjalmsson HH, eds. Proceedings of the 11th International Conference on Intelligent Virtual Agents (IVA 2011). LNAI. Vol 6895. Berlin, Heidelberg: Springer; 2011: 350-362.Empathy is believed to play a major role as a basis for humans’ cooperative behavior. Recent research shows that humans empathize with each other to different degrees depending on several modulation factors including, among others, their social relationships, their mood, and the situational context. In human spatial interaction, partners share and sustain a space that is equally and exclusively reachable to them, the so-called interaction space. In a cooperative interaction scenario of relocating objects in interaction space, we introduce an approach for triggering and modulating a virtual humans cooperative spatial behavior by its degree of empathy with its interaction partner. That is, spatial distances like object distances as well as distances of arm and body movements while relocating objects in interaction space are modulated by the virtual human’s degree of empathy. In this scenario, the virtual human’s empathic emotion is generated as a hypothesis about the partner’s emotional state as related to the physical effort needed to perform a goal directed spatial behavior

    The focus of the Journal of Business Chemistry: Good management practices in the chemical industry

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    The chemical industry is one of the major global industries with specific management challenges. It is an industry in transition. Compared with its economic importance and its role in providing solutions for grand societal challenges, this industry as well as companies from pharmaceutical and biotech sectors receive comparatively little attention from management literature. With the Journal of Business Chemistry, we intend to create an international platform for discussions between scholars and practitioners on good management practice in these sectors. We thereby promote an interdisciplinary and transboundary approach and encourage authors and readers to look at developments at the intersection of natural sciences and management

    Zufriedenheitsdynamik und Kundenbindung in Kfz-Kundendienstleistungsprozessen : Ergebnisse einer empirischen Studie

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    Als schwĂ€chstes Glied der Kette Zulieferer - Hersteller - Handel bekommen die vorwiegend klein- und mittelstĂ€ndisch geprĂ€gten Kfz-Betriebe den Wettbewerbsdruck in der Automobilbranche besonders zu spĂŒren: stagnierende Fahrzeug-Inlandsnachfrage, ĂŒberbesetzte HĂ€ndlernetze und faktische Abnahmeverpflichtungen fĂŒhren zu steigenden LagerbestĂ€nden und rĂŒcklĂ€ufigen Umschlagsgeschwindigkeiten. Daraus resultierende LiquiditĂ€tsengpĂ€sse erfordern steigende Verkaufszahlen. Diese sind im gesĂ€ttigten Markt aber nur auf Kosten anderer Anbieter erreichbar, so daß sich viele HĂ€ndler zu massiven PreiszugestĂ€ndnissen und "Rabattschleuderei" vor allem im Intra-Brand-Wettbewerb gezwungen sehen. VerstĂ€rkt durch Reimporte aus anderen EU-LĂ€ndern fĂŒhrt dies bei vielen HĂ€ndlern zu sinkenden DeckungsbeitrĂ€gen, mithin zu Verlusten im NeuwagengeschĂ€ft. Ähnlich negative Entwicklungen kennzeichnen den Kundendienstbereich. Verbesserte ProduktqualitĂ€t, verlĂ€ngerte Serviceintervalle und reparaturfreundliche Konstruktionsprinzipien erfreuen zwar den Konsumenten, verursachen aber Auslastungsprobleme im WerkstattgeschĂ€ft vieler Kfz-Betriebe. Zudem erfordert die steigende technische KomplexitĂ€t der Fahrzeuge einen erhöhten Kapitalbedarf fĂŒr Investitionen in die Werkstatt- und Kundendienstausstattung der Betriebe sowie zusĂ€tzliche Ausgaben fĂŒr Personalschulungsmaßnahmen. Im z.T. hochprofitablen Teile- und ZubehörgeschĂ€ft gehen Marktanteile an Spezialanbieter fĂŒr Reifen, Bremsen, Auspuff, Car-Hifi etc. verloren. Außerdem entsteht zunehmender Konkurrenzdruck durch Einkaufszentren, die schnelldrehende Serviceteile wie z.B. WischerblĂ€tter oder Ölfilter fĂŒr den "Do it yourself"-Bereich preisgĂŒnstig anbieten. Folge der zuvor skizzierten Entwicklung ist eine drastische Verschlechterung der Ertrags- und Renditesituation im Kfz-Handel
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