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  • 1
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    High Angular Resolution and Young Stellar Objects: Imaging the Surroundings of MWC 158 by Optical Interferometry (2022)
    EDP SCIENCES
    Details
    Publication Date: 2024-04-04
    Description: This book is a collection of 19 articles which reflect the courses given at the Collège de France/Summer school “Reconstruction d'images − Applications astrophysiques“ held in Nice and Fréjus, France, from June 18 to 22, 2012. The articles presented in this volume address emerging concepts and methods that are useful in the complex process of improving our knowledge of the celestial objects, including Earth.
    Keywords: image reconstruction ; astrophysical applications ; thema EDItEUR::P Mathematics and Science::PH Physics
    Language: English
    Format: image/jpeg
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    E-BOOK
  • 2
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    Biogenic Silica Dissolution In Southern Ocean Sediments (2003)
    In:  EPIC3EGS-AGU-EUG Joint Assembly, 6-11 April, Nice, France.
    Details
    Publication Date: 2019-07-17
    Description: Biogenic silica (BSi) is a major component in marine geochemical cycles and asuitable proxy for paleoproductivity. The Southern Ocean plays a key role in thebiochemical cycle of silicon. For questions of opal preservation and to assess theglobal biogenic silica cycle it is important to understand the processes controling BSidissolution.Continuously stirred flow-through experiments were used to determine the kineticsand solubility of biogenic silica. Use of flow through reactors allow quantificationof dissolution rates and saturation concentrations under well defined conditions.Dissolution rates of sediment samples in stirred flow-through reactors were measuredas a function of the degree of undersaturation by varying the silica acid concentrationsor the flow rate of the inflow solution. Sediment samples were selected from differentregions of the Southern Ocean, e.g. Weddel Sea, Scotia Sea, Polar Front Zone.New and published information about BSi dissolution kinetics will be considered ina regional context. For this purpose detailed information of diatom assemblages andclay mineralogy are considered. Furthermore an up to date compilation of diffusivesilicic acid fluxes and BSi content in surface sediments is presented. The combinationof results from laboratory measurements and regional distribution of parameterseffecting the benthic silica cycle helps us to decipher processes regulating the BSiburial and provides a more detailed understanding of the dissolution of BSi in surfacesediments within certain regions of the Southern Ocean.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Format: application/pdf
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    PAPER (OA)
  • 3
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    Quartärgeologische Kartierung im Land Hadeln (2001)
    In:  EPIC368. Conference of the Arbeitsgemeinschaft Nordwestdeutscher Geologen, 5-8 June, Bremerhaven, Germany.
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 4
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    Feldversuche in Oberflächengewässern zur Durchlässigkeit. (2002)
    In:  EPIC3Diplomarbeit
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Thesis , notRev
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  • 5
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    Das Küstenholozän und seine Basisfläche im westlichen Land Hadeln (2001)
    In:  EPIC3Diplomkartierung
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Thesis , notRev
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  • 6
    Electronic Resource
    Electronic Resource
    SOLVENTS HAVING HIGH DIELECTRIC CONSTANTS. XIV. SOLUBILITIES AND REACTIONS OF SEVERAL TYPICAL INORGANIC AND ORGANIC COMPOUNDS IN N-METHYLACETAMIDE1 (1963)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 67 (1963), S. 281-283 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100796a015
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  • 7
    Electronic Resource
    Electronic Resource
    Van der Waals and capacitive forces in atomic force microscopies (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 5245-5248 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this article we show that in the atomic force microscopy experiments performed on a metallic surface, there is always a long range electrostatic force in addition to the van der Waals forces. This capacitive force is due to the contact potential between the tip and the surface and exists even without external applied potential. We have calculated this capacitive force for a real geometry of the tip–sample system and compared it to the van der Waals force calculated for the same geometry. We conclude that the electrostatic force is always dominant for a tip–surface distance larger than half of the tip radius of curvature. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371506
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  • 8
    Electronic Resource
    Electronic Resource
    In situ measurement of large piezoelectric displacements in resonant atomic force microscopy (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 2848-2852 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In resonant atomic force microscopy (AFMR) the calibration of the tip–sample relative displacement remains a major problem. Commonly used PZT piezoceramics exhibit a nonlinear behavior response for large applied voltages. For low voltages applied to the piezoceramics (i.e., small corrugations), the calibration can be performed by measuring the height of known structures. For large displacements, the interferometric heterodyne detection used in the AFMR provides a relative tip–sample displacement up to 10 μm, without removing the piezo-tube from the microscope. From these measurements, it was established that the piezosensitivity is not a constant parameter. Its averaged value during an excursion depends linearly on the applied voltage. With this system, routine controls are very easy and an example is given of the displacement corrections related to the nonlinearity of the piezo-tube for the electrostatic interaction between the tip and a gold surface. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145566
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  • 9
    Electronic Resource
    Electronic Resource
    Ocean-floor hydrothermal metamorphism in the Limousin ophiolites (western French Massif Central): evidence of a rare preserved Variscan oceanic marker (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 23 (2005), S. 0 
    Details
    ISSN: 1525-1314
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The Limousin ophiolite is located at the suture zone between two major thrust sheets in the western French Massif Central. This ophiolitic section comprises mantle-harzburgite, mantle-dunite, wehrlites, troctolites and layered gabbros. It has recorded a static metamorphic event transforming the gabbros into undeformed amphibolites and the magmatic ultramafites into serpentinites and/or pargasite-bearing chloritites. With various thermobarometric methods, it is possible to show that the different varieties of amphibole have registered low-P (c. 0.2 GPa) conditions with temperature ranging from high-T, late-magmatic conditions to greenschist–zeolite metamorphic facies. The abundance of undeformed metamorphic rocks (which is typical of the lower oceanic crust), the occurrence of Ca–Al (–Mg) metasomatism illustrated by the growth of Ca–Al silicates in veins or replacing the primary magmatic minerals, the P–T conditions of the metamorphism and the numerous similarities with oceanic crustal rocks from Ocean Drilling Program and worldwide ophiolites are the main arguments for an ocean-floor hydrothermal metamorphism in the vicinity of a palaeo-ridge. Among the West-European Variscan ophiolites, the Limousin ophiolites constitute an extremely rare occurrence that has not been involved in any HP (subduction-related) or MP (orogenic) metamorphism as observed in other ophiolite occurrences (i.e. France, Spain and Germany).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1525-1314.2005.00610.x
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  • 10
    Electronic Resource
    Electronic Resource
    Specific Incorporation of Precursors into DNA by Feeding Labeled Bacteria to Paramecium aurelia (1964)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 11 (1964), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Studies were carried out on the introduction of labeled precursors into the DNA of Paramecium aurelia (syngen 4, stock 51) by way of the bacteria that are used for food. A thymine-requiring strain of Escherichia coli (15 T−) was labeled by growth in either H3-methyl thymidine or 2-C14 bromouracil, washed free of the exogenous label, and fed to the paramecia. The tritium label from the bacteria was incorporated almost exclusively into the DNA of the paramecia, whereas it was much less specifically incorporated when introduced directly from the medium. The Cu label from bromouracil was also incorporated mainly into the DNA of the paramecia although a small amount appeared in RNA. The formation of labeled food vacuoles was followed. Food vacuoles were formed at a nearly constant rate, with the total number of vacuoles increasing throughout the cycle. The lifetime of the vacuoles was about 2.5 hours. Incorporation of the label into the DXA of the paramecia begins within a few minutes of the formation of the first labeled vacuole. DNA synthesis begins about 1.5 hr after the previous fission (total cell cycle about 5.8 hr) and progresses at a nearly constant rate throughout the remainder of the cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1964.tb01794.x
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