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  • 1
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    Polyphase Magmatism During the Formation of the Northern East Greenland Continental Margin (2021)
    Details
    Publication Date: 2021-09-15
    Description: New marine geophysical data acquired across the partly ice-covered northern East Greenland continental margin highlight a complex interaction between tectonic and magmatic events. Breakup-related lava flows are imaged in reflection seismic data as seaward dipping reflectors, which are found to decrease in size both northward and southward from a central point at 75°N. We provide evidence that the magnetic anomaly pattern in the shelf area is related to volcanic phases and not to the presence of oceanic crust. The remnant magnetization of the individual lava flows is used to deduce a relative timing of the emplacement of the volcanic wedges. We find that the seaward dipping reflectors have been emplaced over a period of 2–4 Ma progressively from north to south and from landward to seaward. The new data indicate a major post-middle Eocene magmatic phase around the landward termination of the West Jan Mayen Fracture Zone. This post-40-Ma volcanism likely was associated with the progressive separation of the Jan Mayen microcontinent from East Greenland. The breakup of the Greenland Sea started at several isolated seafloor spreading cells whose location was controlled by rift structures and led to the present-day segmentation of the margin. The original rift basins were subsequently connected by steady-state seafloor spreading that propagated southward, from the Greenland Fracture Zone to the Jan Mayen Fracture Zone.
    Keywords: 551 ; 559 ; NE Greenland ; seismic reflection ; seaward dipping reflectors ; continent-ocean transition ; rifting ; Greenland Sea
    Language: English
    Type: article
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    CITATION GEO-LEO
  • 2
    Electronic Resource
    Electronic Resource
    Long-term effects of postnatal hypoxia and flunarizine on the dopaminergic system
    Amsterdam : Elsevier
    Pharmacology, Biochemistry and Behavior 46 (1993), S. 867-871 
    Details
    ISSN: 0091-3057
    Keywords: Dopamine ; Flunarizine ; Hypoxia ; Learning behavior ; Long-term effect ; Striatum
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0091-3057(93)90215-F
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  • 3
    Electronic Resource
    Electronic Resource
    In vitro testing of plasma-sprayed hydroxyapatite coatings (1994)
    Springer
    Journal of materials science 5 (1994), S. 219-224 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Hydroxyapatite-coated coupons were tested in various physiological media. Immersion in Ringer's solution showed that heat-treated coatings displayed a weight gain but the assprayed coatings underwent a weight loss. Dissolution of the coating was measured by weighing the specimen before and after ageing. Immersion of hydroxyapatite coatings showed the appearance of small spheres that were identified by X-ray diffraction as hydroxyapatite. Changes in coating morphology were detected and the coating degradation mechanisms are discussed. This paper thus looks at the morphology, composition, crystallinity and dissolution of hydroxyapatite coatings aged in Ringer's solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00121092
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  • 4
    Electronic Resource
    Electronic Resource
    Characterization of the closed porosity in plasma-sprayed alumina (1997)
    Springer
    Journal of materials science 32 (1997), S. 3407-3410 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The porous phase of plasma-sprayed alumina was characterized using mercury intrusion porosimetry, water immersion methods, and small-angle neutron scattering. A comparison of the results shows that the intrusion techniques did not yield a full porous phase characterization. It has been found that while the amount of closed porosity was 1.4%(±0.5%) of the sample volume, this volume accounted for only 60% of the total internal surface area. The smallest void diameter was found to be 10 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018616632261
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  • 5
    Electronic Resource
    Electronic Resource
    Mercury intrusion porosimetry of plasma-sprayed ceramic (1997)
    Springer
    Journal of materials science 32 (1997), S. 3925-3932 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Limitations and corrections for the application of mercury intrusion porosimetry (MIP) in measuring plasma-sprayed ceramic (alumina–titania) deposits are studied. The data reduction procedures of the MIP technique are discussed; the importance of which changes between different machines and samples. Thus, it is proposed that each published result should be accompanied by the specific data reduction procedures and assumptions used so that data may be compared. Preparation of plasma-sprayed ceramic samples has a significant influence on the MIP result. Sample fragmentation into irregular pieces (below about 1.2 mm effective diameter) prior to the MIP measurement resulted in an increase of surface effects such that the surface roughness dominated the MIP data and the measured porosity volume increased. Variation in sample thickness between 0.8 and 4.7 mm did not change the measured porosity. Orientation (parallel or perpendicular to the substrate) of the flat surface did not have a measurable effect on the MIP results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018612815364
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  • 6
    Electronic Resource
    Electronic Resource
    Statistical analysis of microhardness variations in thermal spray coatings (1995)
    Springer
    Journal of materials science 30 (1995), S. 111-117 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A thermal barrier coating system consisting of a NiCoCrAlY bond coat and cerium-stabilized zirconia ceramic coating was sprayed on to a metallic substrate. Ageing at 400 and 800°C for 100, 500, and 1000 h was performed. Microhardness measurements of as-sprayed and heat-treated samples were used to evaluate microstructural variations throughout the thermally sprayed coating after different ageing conditions. Forty readings were taken at both the bond coat and ceramic coating positions within the thermal barrier coating (TBC) system and adjusted by subtracting the two largest and two smallest readings. Both data sets were statistically analysed to assess whether they belonged to Weibull or Gaussian (or “normal”) distributions. This study has established that the homogeneity of coatings, at least as measured by a microhardness test, varies during service and, thus, may influence the lifetime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00352139
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  • 7
    Electronic Resource
    Electronic Resource
    Wear of coatings in wool-severing applications (1992)
    Springer
    Journal of materials science 27 (1992), S. 6687-6694 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Various surface treatments; including thermally sprayed ceramic coatings, titanium nitride (TiN) deposited by physical vapour deposition and nitrogen implantation processes, have been applied to combs and cutters that are used for wool severence. A series of laboratory and field tests have been carried out to evaluate the relative merits of the different treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01165955
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  • 8
    Electronic Resource
    Electronic Resource
    Mode II fracture toughness test for thermally sprayed coatings (1990)
    Springer
    International journal of fracture 43 (1990), S. R57 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00035094
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  • 9
    Electronic Resource
    Electronic Resource
    082 Tyrosine hydroxylase activity and DA-metabolites following early postnatal hypoxia (1992)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 343 (1992), S. 140-140 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332076
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  • 10
    Electronic Resource
    Electronic Resource
    The effect of high-velocity oxygen fuel, thermally sprayed WC–Co coatings on the high-cycle fatigue of aluminium alloy and steel (1998)
    Springer
    Journal of materials science 33 (1998), S. 3095-3100 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Thermally sprayed WC–Co coatings are currently used in numerous contact wear applications in the aircraft, automotive and paper industries. High-cycle fatigue tests were performed at room temperature and 370 °C on SAE 12L14 low-carbon steel and aluminium alloy 2024-T4 thermally sprayed with WC–17 wt% Co using the high-velocity oxygen fuel process. The fatigue life distributions of specimens in the polished, grit-blasted, peened and coated conditions are presented as a function of the probability of failure. Composite beam theory was applied to the coated beam to evaluate the stresses and elastic modulus.The stress–strain curves for the coated and uncoated specimens were used to evaluate the stiffness factor for the aluminium alloy and steel. It is concluded that (i) the coated specimens exhibited significantly high fatigue lives compared with the uncoated specimens, (ii) the mechanisms of deformation for the coated and uncoated aluminium alloy specimens are quite different and (iii) the elastic modulus of the coating plays a significant role in determining the fatigue strength of the coated component. © 1998 Kluwer Academic Publishers
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004339705235
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