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  • Nature Publishing Group  (5)
  • American Institute of Physics (AIP)  (2)
  • 2000-2004  (2)
  • 1960-1964  (5)
  • 1930-1934
  • 1
    Electronic Resource
    Electronic Resource
    Strength of plasma sprayed turbine-blade coatings using an advanced spallation technique (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 6523-6529 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present an application of the spall technique for studying the strength, homogeneity, and adhesion of plasma sprayed coatings on a metal substrate. We used a flyer plate impact and a pulsed high-power proton beam to generate short, intense pressure pulses. To study adhesion it is necessary to provide a spall fracture at the interface. This was realized due to the bell-shaped power profile in the ion beam cross section. As a result, the spall fracture inside the samples occurred in tests with the ion beam, at different distances from the surface, including the interface between the coating and the substrate. Using a line-imaging laser-Doppler velocimeter, we were able to measure the free surface velocity histories for a range of load parameters in each experiment. The results of the measurements demonstrate the great influence of annealing on the homogeneity and strength of the coating and a lesser influence of the substrate temperature at coating on the adhesion. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1353556
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  • 2
    Electronic Resource
    Electronic Resource
    Hydrogen response mechanism of Pt–GaN Schottky diodes (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 1222-1224 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Besides silicon carbide, group-III nitrides are also suitable large-band-gap semiconductor materials for high-temperature gas sensor devices. Exposing GaN-based Schottky diodes with catalytically active platinum electrodes to hydrogen, we observed a decrease of the rectifying characteristics which we attribute to a decrease in Schottky barrier height. Current–voltage and elastic recoil detection measurements were used to investigate the H-sensing behavior of such devices. Our results indicate an interfacial effect as the origin of the sensor response to hydrogen. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1450044
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  • 3
    Electronic Resource
    Electronic Resource
    ‘Impact Contamination’ of the Mokoia Carbonaceous Chondrite (1964)
    [s.l.] : Nature Publishing Group
    Nature 204 (1964), S. 567-567 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The foregoing observation indicates that in the course of the impact of a given meteorite, foreign bodies can penetrate to considerable depth, particularly in the case of the porous and soft carbonaceous stones. Beside this physical penetration process, illustrated by this work, distillation of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/204567a0
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  • 4
    Electronic Resource
    Electronic Resource
    Anomalous Contrast in Electron Micrographs of Negative Stained Specimens (1964)
    [s.l.] : Nature Publishing Group
    Nature 201 (1964), S. 590-591 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The physical basis of this method is not yet understood and many authors have tried various interpretations25. By spraying single droplets of a phosphotungstate solution on to a specimen already prepared in the usual way itbecame possible to compare the brightness of embedded and free-lying ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/201590a0
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  • 5
    Electronic Resource
    Electronic Resource
    in vivo Destruction of Exogenously Applied Indolyl-3-Acetic Acid as Influenced by Naturally Occurring Phenolic Acids (1963)
    [s.l.] : Nature Publishing Group
    Nature 200 (1963), S. 761-763 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THERE is quite a controversy in the literature as to the growth activity of certain naturally occurring phenolic acids. While Vendrig and Buffel1'2 have stated that caffeie acid may be a very important growth substance, there is another possibility, that the phenols may act in vivo as inhibitors or ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/200761a0
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  • 6
    Electronic Resource
    Electronic Resource
    Interpretation of Micro-Structures in Carbonaceous Meteorites (1962)
    [s.l.] : Nature Publishing Group
    Nature 196 (1962), S. 929-932 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE considerable number and variety of microscopical objects within the Orgueil and several other carbonaceous stones were interpreted by some authors1 o2 as of likely organic origin. These conclusions have been contested8 and critically discussed4'5. The aim of the present article is to attempt ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/196929a0
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  • 7
    Electronic Resource
    Electronic Resource
    Dissolved Gases in East African Lakes (1963)
    [s.l.] : Nature Publishing Group
    Nature 198 (1963), S. 569-569 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN my opinion the suggestion that the carbon dioxide in Lake Kivu is of juvenile origin, whereas the methane is biogenic, is unacceptable on the ground that the concentration of the latter within the neighbouring Lakes Tanganyika and Nyasa is some 5-6 orders of magnitude lower (see Table 1 of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/198569a0
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