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  • 1
    Online Resource
    Online Resource
    Verbesserung der Durchlässigkeit in geothermischen Reservoiren : BMU-Projekt ... ; Endbericht 01.06.2004 - 31.8.2007 (2007)
    Aachen
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: Online-Ressource (139 S., 12,8 MB) , Ill., graph. Darst.
    URL: https://edocs.tib.eu/files/e01fb08/586077952.pdf
    URL: https://doi.org/10.2314/GBV:586077952
    URL: https://edocs.tib.eu/files/e01fb08/586077952l.pdf
    DOI: 10.2314/GBV:586077952
    Language: German
    Note: Förderkennzeichen BMU 0329940. - Literaturverz , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Auch als gedr. Ausg. vorhanden , Systemvoraussetzungen: Acrobat reader.
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    GEOMAR CATALOGUE
    Link to Library Catalog
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  • 2
    Online Resource
    Online Resource
    Erstellung statistisch abgesicherter thermischer und hydraulischer Gesteinseigenschaften für den flachen und tiefen Untergrund in Deutschland : Phase 2 - westliches Nordrhein-Westfalen und bayerisches Molassebecken ; Abschlussbericht 01.09.2006 - 31.05.2009 (2009)
    Aachen
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: Online-Ressource (202 S., 35,4 MB) , Ill., graph. Darst., Kt.
    URL: https://edocs.tib.eu/files/e01fb10/624354296.pdf
    URL: https://doi.org/10.2314/GBV:624354296
    URL: https://edocs.tib.eu/files/e01fb10/624354296l.pdf
    DOI: 10.2314/GBV:624354296
    Language: German
    Note: Förderkennzeichen BMU 0327563 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden. - Auch als gedr. Ausg. vorhanden , Systemvoraussetzungen: Acrobat reader.
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    GEOMAR CATALOGUE
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  • 3
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    Component parts of the World Heat Flow Data Collection
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Area/locality; Conductivity, average; Depth, bottom/max; Depth, top/min; ELEVATION; Heat flow; LATITUDE; LONGITUDE; Method comment; Number; Sample, optional label/labor no; Temperature gradient
    Type: Dataset
    Format: text/tab-separated-values, 284 data points
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    DATA PANGAEA
  • 4
    Electronic Resource
    Electronic Resource
    Analysis of conductive and convective heat transfer in a sedimentary basin, demonstrated for the Rheingraben (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 100 (1990), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The identification and quantification of conductive and convective components in the heat transfer of a sedimentary basin is demonstrated for the Rheingraben. Three different methods of varying complexity as well as three independent data sets are employed: (1) energy budget considerations based on hydraulically perturbed thermal data from shallow boreholes (〈 500 m), (2) 1-D vertical Peclet number analysis of thermal data from 22 deep boreholes (〉 1000 m), and (3) 2-D finite difference modelling of the fully coupled fluid flow and heat transport equations on a vertical cross-section of the entire Rheingraben. Energy budget considerations yield a conductive basal heat flow density of 84 + 40/–10 mW m−2, and in good agreement with this Peclet number analysis, gives median values in the range 90 ± 35 mW m−2. In the first case, the basement is formed by low permeable, tertiary sediments at about 500 m depth, and in the second by the transition from the sedimentary graben fill to the crystalline basement at depths of between 2000 and 4000 m. It is shown how results from numerical modelling support the flow field assumptions made by methods (1) and (2), as well as the value of 80 ± 10 mW m−2 for average basal heat flow density entering the graben from below. Conversely, the Peclet number range Pe≤ 1.2 inferred from method (2) can be applied for a (at least partial) calibration of the fully coupled hydrothermal model calculations. This technique is suggested as a potentially interesting thermal method for constraining regional-scale permeability.An interpretation of heat transport is presented that satisfies the experimentally established patterns of both temperature and heat flow density in the Rheingraben. Moreover, it is demonstrated that the thermal anomalies along the western rim of the graben (such as Pechelbronn, France or Landau, Germany) can be convincingly explained by a basin-wide, deep rooted E–W groundwater circulation that locally enhances a background basal heat flow density of about 80 mW m−1 on average by 50 per cent and at individual sites by as much as 120 per cent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1990.tb00693.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Fibrinolytic activity of human gingiva in the presence or absence of plaque bacteria (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 27 (1992), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Activators of fibrinolysis are found in the gingival connective tissue and in the sulcular epithelium. The influence of plaque bacteria and the related inflammatory reaction on the fibrinolytic activity has been evaluated in the human gingiva. An autohistographic technique was applied to sections taken from three groups of 6 specimens each: group A from clinically healthy sites with plaque index = 1 and no bleeding on probing; group B from areas with unambiguous visual signs of gingivitis, with plaque index = 2–3 and bleeding on probing; group C from sites previously treated with professional toothcleaning twice a week for 3 months and with chlorhexidine mouthrinses twice a day for the final 3 wk, in order to obtain a virtually complete elimination of the plaque bacteria. In group C the plaque index was 0 and there was no bleeding on probing. Connective tissue fibrinolytic activity was present in all the sections from the three groups. The sulcular fibrinolytic activity was observed in all the sections taken from the specimens of groups A and B. In contrast, no fibrinolytic activity was observed over the sulcular area in any section taken from the specimens of group C. Therefore, this study does not support previous claims that healthy sulcular epithelium is capable of releasing activators of fibrinolysis. It can be concluded that the presence of any amount of plaque bacteria is associated with sulcular fibrinolytic activity. Contrarily, the elimination of plaque bacteria is associated with the absence of any detectable sign of fibrinolytic activity in the gingival sulcus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0765.1992.tb02083.x
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Localized ridge augmentation using guided tissue regeneration in humans. A report of nine cases. (1993)
    Copenhagen : Munksgaard International Publishers
    Clinical oral implants research 4 (1993), S. 0 
    Details
    ISSN: 1600-0501
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Nine localized buccal ridge deformities were treated combining the use of barrier membranes and resorbable space-making material. After elevating flaps, the bone defects were completely filled with calcium carbonate and a fibrin-fibronectin sealing system (FFSS). Membranes (Gore-Tex aug-mentation material) were then shaped and positioned to cover the calcium carbonate overlapping the surrounding bone. The flaps were sutured, taking care to avoid any compression on the treated area. The membranes were removed 4 to 5 months postoperatively: in all cases the membranes were tightly adapted to the regenerated tissues and force was required to separate them from the underlying tissues. The defects were filled with hard, bone-like tissue. The histology from one case, taken 1 year post-operatively, confirmed the regeneration of bone and revealed the presence of a few residual particles of calcium carbonate in the sample. The clinical appearance of the treated areas was satisfactory for colour. texture and form. The horizontal deficiencies were almost completely resolved in all cases, while the vertical component showed incomplete filling in some cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0501.1993.040406.x
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Bacterial colonization of barrier material and periodontal regeneration (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 23 (1996), S. 0 
    Details
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract The objective of this study was to evaluate the relationship between the presence of bacteria on the tooth-facing surface of ePTFE barriers and the clinical outcome of membrane supported reconstructive periodontal surgery. 20 systemically healthy subjects affected by chronic periodontitis were enrolled. One tooth site per patient, associated with an angular bony defect and a probing attachment loss of 〉4 mm. was selected to be treated by means of a guided tissue regeneration procedure using an ePTFE barrier membrane. Antibiotics (Augmentin 1 g/day) for 2 weeks were prescribed. In addition to the use of chlorhexidine for post-surgical plaque control, all patients were recalled once a week for professional tooth cleaning. The barrier material was harvested for SEM analysis after 4–6 weeks. Professional tooth cleaning and reinforcement of selperformed oral hygiene measures were given at 1 month intervals after membrane removal. For each treated site, the difference in probing attachment loss between baseline examination and a follow-up examination after 6 months of healing was calculated. The results of the SEM-analysis revealed that bacterial colonization was evident in the collar area of all the retrieved membranes. In the mid part of the membranes 30 out of 60 microscopic fields (50%) demonstrated microbial colonization, and in the most apical part 9 out of 60 fiels (15%). Regression analysis indicated that gain in probing attachment level was positively-correlated to initial attachment loss and negatively correlated to microbial colonization of the mid part of the membranes. It was concluded that bacterial colonization in the mid part of the ePTFE membrane reduced the potential gain in probing attachment following GTR–therapy with almost 50%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-051X.1996.tb00534.x
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Variation of Permeability with Porosity in Sandstone Diagenesis Interpreted with a Fractal Pore Space Model (2000)
    Springer
    Pure and applied geophysics 157 (2000), S. 603-619 
    Details
    ISSN: 1420-9136
    Keywords: Key Words: Permeability, sandstone, fractals, diagenesis.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —Permeability is one of the key rock properties for the management of hydrocarbon and geothermal reservoirs as well as for aquifers. The fundamental equation for estimating permeability is the Kozeny-Carman equation. It is based on a capillary bundle model and relates permeability to porosity, tortuosity and an effective hydraulic pore radius which is defined by this equation. Whereas in clean sands the effective pore radius can be replaced by the specific surface or by the grain radius in a simple way, the resulting equations for permeability cannot be applied to consolidated rocks. Based on a fractal model for porous media, equations were therefore developed which adjust the measure of the specific surface and of the grain radius to the resolution length appropriate for the hydraulic process. These equations are calibrated by a large data set for permeability, formation factor, and porosity determined on sedimentary rocks. This fractal model yields tortuosity and effective pore radius as functions of porosity as well as a general permeability-porosity relationship, the coefficients of which are characteristic for different rock types. It can be applied to interpret the diagenetic evolution of the pore space of sedimentary rocks due to mechanical and chemical compaction with respect to porosity and permeability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00001110
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  • 9
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    Improved interpretation of t2 distributions from nmr relaxation measurements for a better prediction of low permeabilities (2007)
    Details
    Publication Date: 2017-04-04
    Description: see Abstract Volume
    Description: Istituto Nazionale di Geofisica e Vulcanologia, Italy (INGV) Centre National de la Recherche Scientifique (CNRS) ExxonMobil Upstream Research Company
    Description: Unpublished
    Description: Erice, Italy
    Description: open
    Keywords: rock physics, geomechanics, thermo-hydro-mechanical coupling, natural hazards ; 04. Solid Earth::04.01. Earth Interior::04.01.04. Mineral physics and properties of rocks
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
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    PAPER (OA)
  • 10
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    Analysis of conductive and convective heat transfer in a sedimentary basin, demonstrated for the Rheingraben (1989)
    In:  EPIC3Geophys J
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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    PAPER (OA)
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