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  • 1
    Electronic Resource
    Electronic Resource
    Measurements in a heated turbulent wall jet on a concave wall (1994)
    Springer
    Mineralium deposita 29 (1994), S. 291-297 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The paper contains the results of extensive single-point hot-wire and resistance-thermometer measurements in a wall jet on a heated concave wall with an external free stream. It is found that the turbulence in the inner (wall) and outer layers is sensitive to the distortion produced by the curved wall, broadly confirming current views of these effects. The effect on the turbulence of streamline curvature is stabilising in the outer layer, destabilising in the inner. Consequently the point of zero shear stress is closer to the point of maximum mean velocity than in flat and convex wall jets with which these new results are compared. The rate of growth is about 80% of that of the equivalent flat wall flow, and about half that of the convex wall flow. Changes in the wall shear stress and heat flux, which are increased relative to the flat wall flow, are significant but less than the changes in the corresponding convex wall flow. The greatest changes occur in the triple products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01816693
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  • 2
    Electronic Resource
    Electronic Resource
    Resistometric and Mössbauer studies on structural relaxation in (Ni,Fe)75Si10B15 metallic glasses (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 2091-2099 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structural relaxation in (Ni,Fe)75Si10B15 metallic glasses has been studied by measuring resistivity changes and Mössbauer spectra. The sign and magnitude of resistivity changes due to the relaxation depend strongly on the Ni/Fe ratio. The isothermal resistivity changes fit well the nonlinear kinetic form, indicating that the fluctuation of local environments of Ni and Fe atoms is very large and Ni and Fe atoms in Ni-Fe-Si-B metallic glasses are mobile compared with Co and Fe atoms in Co-Fe-Si-B metallic glasses. The compositional dependence and kinetic parameters for reversible resistivity changes and Mössbauer spectra strongly support that the reversible structural relaxation corresponds to the reversible short-range ordering between Ni and Fe atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346563
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  • 3
    Electronic Resource
    Electronic Resource
    Generation of ultralong pulse ArF emission in dynamic mixtures of He plasma jet with Ar/F2 neutral gas (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 1378-1380 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ultralong pulse ((approximately-greater-than)40 μs) fluorescence of ArF excimer molecules at 193 nm has been generated by dynamically mixing a pulse discharge excited He jet with neutral Ar/F2 gas located downstream in a vacuum chamber. Rapid cooling of the high temperature He plasma through neutral gas collisions and efficient energy transfer to Ar gas create Ar metastable atoms, which form ArF excimer molecules through harpoon reactions with F2, in relatively field-free space. The fluorescence intensity increased with increasing F2 concentration up to ∼10% F2 in Ar with 2-atm backing pressure. In a preliminary experiment with an ArF probe laser, this mixture showed an amplification gain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107543
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  • 4
    Electronic Resource
    Electronic Resource
    Small-angle X-ray scattering study of lamellar microdomains in a block copolymer (1991)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 24 (1991), S. 679-684 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Lamellar microdomains formed in the solvent-cast films of a poly[styrene-block-(ethylene-alt-propylene)] (SEP) diblock polymer were studied by small-angle X-ray scattering (SAXS). The SAXS profiles, displaying a series of peculiar scattering maxima which cannot be ascribed to the higher-order diffraction maxima from a regular lamellar spacing, were analyzed based on a model of the one-dimensional paracrystal with a preferential orientation. The results suggest that these maxima are due to higher-order scattering maxima from single lamellar microdomains. The maxima suggest that the relative standard deviation for the distribution of the polystyrene lamellar size is much smaller than that of the lamellar spacing, giving rise to a situation in which the oscillation of the particle factor with scattering vector h persists up to high h values while that of the lattice factor damps to unity at low h values. The SAXS result was interpreted as being due to a bending distortion of the polystyrene lamella with a smaller thickness and a narrower thickness distribution than those of the poly(ethylene-alt-propylene) lamella. A study by transmission electron microscopy tends to support this result.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889890012109
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  • 5
    Electronic Resource
    Electronic Resource
    Observation of shape change in the raman spectrum of graphite irradiated by electron beam (1990)
    Springer
    Journal of materials science 9 (1990), S. 19-21 
    Details
    ISSN: 1573-4811
    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/BF00722856
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of rounding side-corners on aerodynamic forces and turbulent wake of a cube placed on a ground plane (1991)
    Springer
    Experiments in fluids 11 (1991), S. 58-64 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper describes the experimental study of a flow past a cube with rounded side-corners placed in a ground plane under the condition of δ/D 〈 1, where δ is the thickness of the upstream boundary layer. The experiment was carried out in an N.P.L. type wind-tunnel having a working section of 500 mm×500 mm × 2,000 mm at a Reynolds number 4.74×104. The suface-pressure distribution on the cube was measured, and the drag coefficient was determined from the surface-pressure distribution. Furthermore, two kinds of vortices generated around the cube were observed. The distribution of velocities and turbulent intensities in the turbulent wake behind the cube with rounded side corners were measured, and compared with those of a two-dimensional cylinder. As a result, it was found that the drag coefficient decreases rapidly in the range of 0 ≦ 2R/D ≦ 0.3, and the Strouhal number for the arch-vortex shedding increases as the radius of the corner increases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00198432
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  • 7
    Electronic Resource
    Electronic Resource
    Measurements in a heated turbulent wall jet on a concave wall (1990)
    Springer
    Experiments in fluids 8 (1990), S. 291-297 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The paper contains the results of extensive single-point hot-wire and resistance-thermometer measurements in a wall jet on a heated concave wall with an external free stream. It is found that the turbulence in the inner (wall) and outer layers is sensitive to the distortion produced by the curved wall, broadly confirming current views of these effects. The effect on the turbulence of streamline curvature is stabilising in the outer layer, destabilising in the inner. Consequently the point of zero shear stress is closer to the point of maximum mean velocity than in flat and convex wall jets with which these new results are compared. The rate of growth is about 80% of that of the equivalent flat wall flow, and about half that of the convex wall flow. Changes in the wall shear stress and heat flux, which are increased relative to the flat wall flow, are significant but less than the changes in the corresponding convex wall flow. The greatest changes occur in the triple products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00187232
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  • 8
    Electronic Resource
    Electronic Resource
    Formation and Magnetic Properties of Fe-Nitrides by N〈sub〉2〈/sub〉〈sup〉+〈/sup〉 -Implantantion into α-Fe Single Crystal Film (1991)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 53-55 (Jan. 1991), p. 598-603 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/58/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.53-55.598.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    A diurnal variation of vasoactive intestinal peptide (VIP) mRNA under a daily light-dark cycle in the rat suprachiasmatic nucleus (1991)
    Springer
    Histochemistry and cell biology 95 (1991), S. 525-528 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary We detected a diurnal change of vasoactive intestinal peptide (VIP) messenger RNA (mRNA) in the rat suprachiasmatic nucleus (SCN) using the in situ hybridization technique combined with computed image analysis. The amount of VIP mRNA was greatest at 02.00 h, the next largest level was seen at 20.00 h during the dark phase and smallest at 14.00 h during the light phase. We also confirmed that the onset of the fluctuation of mRNA occurred 2–6 h prior to the diurnal variation of the content of VIP-like immunoreactivity by semiquantitative immunocytochemistry. These findings suggest that light stimulus from the retina is a primarily influence on the transcription of VIP mRNA and induces a diurnal variation of VIP synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315750
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  • 10
    Electronic Resource
    Electronic Resource
    Hot isostatic pressing of Y-TZP powder compacts (1990)
    Springer
    Journal of materials science 25 (1990), S. 4634-4638 
    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 fundamental study of hot isostatic pressing (HIPing) was performed on Y-TZP powder compacts, and the effect of the various HI Ping process variables (time, temperature and pressure) was examined on the densification behaviour. The results were analysed using Ashby's HIPing model, which was found to be applicable for this system. The densification was found to be governed by the grain-boundary diffusion of cations. The use of grain-boundary transport characteristics determined in this study enabled HIP maps to predict the densification behaviour of HIPing within an accuracy of a factor of three for all stages of densification, except for the results at low HIPing pressure and the region of near full density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01129918
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