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  • 1990-1994  (7)
  • 1925-1929  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Marker and radioactive silicon tracer studies of PtSi formation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2232-2241 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Marker and radioactive 31Si experiments have been performed to investigate atomic diffusion during PtSi formation. The marker work used a thin metallic layer (Ti, Co, Ni) as a marker. Analysis of the marker displacement indicated growth dominated by silicon diffusion (∼90%). The interpretation of data from the radioactive tracer experiments is less clear cut. However, when examined in conjunction with the marker results, it would appear that either PtSi growth took place by silicon substitutional diffusion or by a mixed interstitial mechanism (i.e., a mixture of interstitial and interstitialcy diffusion). Arguments are presented to suggest that silicon vacancy diffusion during silicide growth is the most likely mechanism. This interpretation is found to be generally consistent with other recently published work on PtSi formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351616
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Pt2Si formation: Diffusion marker and radioactive silicon tracer studies (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 230-236 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The moving species during the formation of first-phase platinum silicide, Pt2Si, by thermal annealing is identified with inert markers (Ti, Co, Ge, As) and radioactive 31Si as a tracer. Rutherford backscattering spectrometry is utilized to monitor the flow of atoms past the marker during the silicide forming reaction, while the position of the tracer after the reaction is determined by using sputter depth profiling and radioactivity measurements. Experiments with thin-film structures employing a reference marker at the substrate silicon/amorphous silicon interface and a mobile marker near the amorphous silicon/platinum interface clearly show a shift of the latter marker towards the surface of the sample. The radioactive tracer, initially embedded in nonradioactive silicon and metal, is moved from this position and concentrates at the sample surface. The outcome of both marker and tracer studies is consistent with a picture in which platinum diffuses during the formation of Pt2Si.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345286
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The Seamless Web: Media and Power in the Post-Modern Global Village (1991)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of popular culture 25 (1991), S. 0 
    Details
    ISSN: 1540-5931
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Ethnic Sciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0022-3840.1991.2502_69.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The Raman Effect with Liquid Oxygen, Nitrogen, and Hydrogen (1929)
    [s.l.] : Nature Publishing Group
    Nature 123 (1929), S. 160-160 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN some experiments we recently made to see if a Raman effect could be observed with homopolar molecules, we found that the spectrum of the light scattered by liquid air included six sharp and clearly defined lines not included in the irradiating light, which was that from the mercury arc. The ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/123160a0
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A singular perturbation problem in needle crystals (1990)
    Springer
    Archive for rational mechanics and analysis 109 (1990), S. 139-171 
    Details
    ISSN: 1432-0673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00405240
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    On the Oxygen Spectral Line λ= 5577·35 Å.U (1926)
    [s.l.] : Nature Publishing Group
    Nature 118 (1926), S. 441-441 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A NUMBER of investigators, including Merton, Barratt, Johnson, Cameron and others, have shown that the spectrum of an element in the gaseous state can be profoundly modified if an electric discharge be passed through it when one or other of the rare gases helium, neon, argon is mixed in excess ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/118441a0
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of 12-O-tetradecanoylphorbol-13-acetate (TPA) on substance P-induced histamine release from rat peritoneal mast cells (1990)
    Springer
    Inflammation research 30 (1990), S. 140-142 
    Details
    ISSN: 1420-908X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract 12-O-tetradecanoylphorbol-13-acetate (TPA, 1 to 30 ng/ml) produced a dose-related inhibition of substance P (SP)-induced histamine release from rat peritoneal mast cells. TPA itself induced some histamine release over this concentration range (maximum release about 20% of total). Maximum inhibition of SP-induced release by TPA required preincubation with TPA for at least 10 min. The inhibitory action of TPA was observed in the absence as well as in the presence of extracellular calcium (0.4 mM). Inhibition of diacylglycerol kinase by R 59022 or of diacylglycerol lipase by RHC 80267 reduced SP-induced histamine release. Oleolylacetylglycerol (OAG, 50 μM) inhibited histamine release induced by SP but was less potent than TPA. It is concluded that protein kinase C activation in rat peritoneal mast cells is associated with inhibition of SP-induced histamine release.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01969021
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Smooth static solutions of the Einstein/Yang-Mills equations (1991)
    Springer
    Communications in mathematical physics 143 (1991), S. 115-147 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We consider the Einstein/Yang-Mills equations in 3+1 space time dimensions withSU(2) gauge group and prove rigorously the existence of a globally defined smooth static solution. We show that the associated Einstein metric is asymptotically flat and the total mass is finite. Thus, for non-abelian gauge fields the Yang-Mills repulsive force can balance the gravitational attractive force and prevent the formation of singularities in spacetime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02100288
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    On the periodic solutions of a forced second-order equation (1991)
    Springer
    Journal of nonlinear science 1 (1991), S. 225-245 
    Details
    ISSN: 1432-1467
    Keywords: nonlinear oscillations ; shooting methods ; homoclinic chaos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Summary We study the equations for two-dimensional irrotational motion induced in a rectangular tank of water which is forced to oscillate horizontally in a periodic fashion (“shallow water sloshing”). The problem reduces to a second-order non-autonomous ordinary differential equation. We rigorously show the existence of many solutions obtained previously by numerical computations, and in addition we show that there are many other bounded solutions. We use simple shooting to obtain irregular solutions of the kind obtained by the methods of dynamical systems. In addition, we obtain a kind of “kneading” theory whereby we can order the initial conditions according to the pattern of “spikes” exhibited by the solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01209067
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    Paper (German National Licenses)
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