Pore Structure

Dullien, F. A. L.

doi:10.1016/b978-0-12-223651-8.50007-9

Cited by 456 publications

(137 citation statements)

References 70 publications

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“…The Euler-Poincaré characteristic (EPC) is used to quantify the connectivity of the pore space, i.e. the number of non-redundant closed-loop paths in the pore space geometry [52]. We used the method described in [53] for calculating the EPC on the segmented 3D images.…”

Section: Selection Of Three 100 3 Voxels Cubesmentioning

confidence: 99%

“…Finally, the specific surface area (SSA) describes the available liquid/solid interface where bacteria can attach and live. It is defined as the liquid/solid interface area per unit mass [52] and was straightforwardly calculated as the ratio between boundary solid sites and total solid sites of the cube images. In order to easily compare the ten cubes and SP , we normalized the SSA by the SSA of a sphere of equivalent porosity (figure 2d).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Modeling the effect of soil meso- and macropores topology on the biodegradation of a soluble carbon substrate

Vogel

Makowski

Garnier

et al. 2015

Advances in Water Resources

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International audienceSoil structure and interactions between biotic and abiotic processes are increasingly recognized as important for explaining the large uncertainties in the outputs of macroscopic SOM decomposition models. We present a numerical analysis to assess the role of meso- and macropore topology on the biodegradation of a soluble carbon substrate in variably water saturated and pure diffusion conditions . Our analysis was built as a complete factorial design and used a new 3D pore-scale model, LBioS, that couples a diffusion lattice-Boltzmann model and a compartmental biodegradation model. The scenarios combined contrasted modalities of four factors: meso- and macropore space geometry, water saturation, bacterial distribution and physiology. A global sensitivity analysis of these factors highlighted the role of physical factors in the biodegradation kinetics of our scenarios. Bacteria location explained 28% of the total variance in substrate concentration in all scenarios, while the interactions among location, saturation and geometry explained up to 51% of it

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Section: Selection Of Three 100 3 Voxels Cubesmentioning

confidence: 99%

Section: Accepted Manuscriptmentioning

confidence: 99%

Modeling the effect of soil meso- and macropores topology on the biodegradation of a soluble carbon substrate

Vogel

Makowski

Garnier

et al. 2015

Advances in Water Resources

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“…For details of these theories and their application I refer to the monographs by Bourbie et.al, Dullian and Schön or a comprehensive summary of the theoretical and practical implication of this concept with respect to seismic analysis published by Mavko et.al. (Bourbie et al, 1987;Dullien, 1992;Schön, 1998;Mavko et al, 1998). In this section some key properties of porous media are summarized with respect to the importance for seismic wave propagation.…”

Section: Marine Sedimentsmentioning

confidence: 99%

Acquisition and Inversion of Dispersive Seismic Waves in Shallow Marine Environments

Klein

Bohlen²,

Theilen³

et al. 2005

Mar Geophys Res

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ZusammenfassungDie Kenntnis der elastischen Eigenschaften mariner Sedimente, insbesondere die Scherwellengeschwindigkeit, ist eine wichtige Information für die Untersuchung der Stabilität von Meeresböden. Dies ist insbesondere für geotechnische Anwendungen im flachmarinen Bereich von Bedeutung, aber auch für die Untersuchung von Hangstabilitäten der Kontinentalrän-der und für die Gashydratforschung von Interesse.Seismische Experimente in der Ostsee sowie die Analyse eines Datensatzes aus der Nordsibirischen Laptevsee konnten zeigen, dass dispersive seismische Wellenfelder mit Hilfe einer nahe der Meeresoberfläche geschleppten seismischen Quelle (Airgun) angeregt werden können. AbstractThe knowledge of the shear wave velocity structure of shallow marine sediments is an important information for the assessment of sediment stability. This is of interest for marine geotechnical applications as well as investigations of sea-floor stability of continental shelves and margins and in gashydrate research. The derivation of seismic velocities with special interest on the shear wave velocity from the analysis and inversion of dispersive seismic waves is investigated in this work.Dispersive waves are excited by surface towed airguns and the acquisition was achieved with two different configurations. Firstly, the stationary-receiver method comprises of an ocean bottom seismometer station (OBS) and excitation with a surface towed airgun. Secondly, a towed-acquisition system includes a streamer towed at ten meters above the sea bed and excitation with an airgun. Two different wave types could be observed with either of the two acquisition systems. Interface waves, namely of the Scholte wave type, propagating along the sea floor and guided waves in the water column, denoted as acoustic guided waves despite of their sediment interaction at the sea bed. The both wave types were observed in certain environments indicating the limitations in the acquisition of these wave types depending on the sediment properties. These limitations as well as the difference in dispersion sensitivity to variations of the seismic properties give rise for separate treatment of both wave types. While the dispersion sensitivity of Scholte waves as well as other interface waves is dominant for shear wave velocity variations, the variation of the dispersion of acoustic guided waves is affected by variations of compressional and shear wave velocity as well as density to a smaller extend. The difference in velocity and frequency range of interest for both wave types, i.e. the ranges of most variations in the dispersion characteristics, also affect the required acquisition configuration and parameters. While a long offset recording (exceeding 800 m) is required for acoustic guided waves, the fulfillment of the spatial sample criteria sometimes limits the feasibility to adequately acquire the dispersive wavefield. This is most dominant for the Scholte wave measurements in very soft marine sediments.The derivation of the shear wave velocity structure was inve...

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“…50 Nevertheless, from the Keynesian perspective, these institutional reforms are one-sided and insufficient, since EU-wide coordination is limited to the balanced budgets and sustainable debt levels that are the key concerns of German economic thinking. 51 Thus, the reforms appear as a means to impose the economic model of austerity on other Eurozone members, even more so since Germany has refused to endorse a more encompassing approach to policy coordination, including demand management and wage and social policies. The latter are said to be conducive to overcoming the macroeconomic imbalances in the Eurozone, without placing the burden of adjustment completely on the deficit countries.…”

Section: The Character and Origin Of The Crisismentioning

confidence: 99%

“…According to Dullien and Guérot, contemporary (macro) economic thinking in Germany could be classified as "new classical economics," a school that "builds on neo-classical microeconomics, with a strong influence on rational expectations." 31 From this perspective, financial markets function efficiently through the interplay of rational actors so that market prices reflect the fair value of assets at any time. In the goods and labor markets, output and employment are determined by the supply side rather than aggregate demand.…”

Section: Microeconomic Flexibility Rather Than Macroeconomic Managementmentioning

confidence: 99%

Germany and its Eurozone Crisis Policy: The Impact of the Country's Ordoliberal Heritage

Hillebrand

2015

German Politics and Society

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This article looks critically at the widely held view that Germany has not done enough to help overcome the Eurozone crisis. According to this line of argument, Germany has refused to comprehensively bail out crisis countries, offer mutual support in order to counter speculative attacks or endorse demand-side growth policies. This is allegedly because of a more narrowly defined national self-interest, increased EU-skepticism, and hegemonic ambitions. This article takes the perspective that such criticisms are primarily rooted in a Keynesian reading of the Eurozone troubles, whereas German policies are informed by another rationale: the ideas of so-called ordoliberalism. Generally, this traditional German school emphasizes the importance of principles, rule-based behavior, and long-term goals-and it believes in the (microeconomic) functioning of markets. Consequently, ordoliberals perceive the crisis as resulting from unsustainable debt levels and a lack of competitiveness in southern Europe, concomitant with a failure of Eurozone institutions. Based on this diagnosis, policy proposals are primarily targeted at debt reduction, as well as structural and EU institutional reforms. While Germany's crisis policy thus appears rational from an ordoliberal perspective, it is considered to be at variance with, and inadequate from the viewpoint of a Keynesian approach.

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Pore Structure

Cited by 456 publications

References 70 publications

Modeling the effect of soil meso- and macropores topology on the biodegradation of a soluble carbon substrate

Modeling the effect of soil meso- and macropores topology on the biodegradation of a soluble carbon substrate

Acquisition and Inversion of Dispersive Seismic Waves in Shallow Marine Environments

Germany and its Eurozone Crisis Policy: The Impact of the Country's Ordoliberal Heritage

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