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  • 1
    Electronic Resource
    Electronic Resource
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 12 (2002), S. 404-433 
    ISSN: 0961-5539
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This study considers both a single and multi-mode viscoelastic analysis for wire-coating flows. The numerical simulations utilise a finite element time-stepping technique, a Taylor-Petrov-Galerkin/pressure-correction scheme employing both coupled and decoupled procedures between stress and kinematic fields. An exponential Phan-Thein/Tanner model is used to predict pressure-drop and residual stress for this process. Rheometrical data fitting is performed for steady shear and pure extensional flows, considering both high and low density polyethylene melts. Simulations are conducted to match experimental pressure-drop/flowrate data for a contraction flow. Then, for a complex industrial wire-coating flow, stress and pressure drop are predicted numerically and quantified. The benefits are extolled of the use of a multi-mode model that can incorporate a wide-range discrete relaxation spectrum to represent flow response in complex settings. Contrast is made between LDPE and HDPE polymers, and dependency on individual relaxation modes is identified in its contribution to overall flow behaviour.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 7 (1997), S. 751-766 
    ISSN: 0961-5539
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Considers the filling stage of an injection moulding process for polymer melts through a transient finite element method. Presents results for a thin-walled cup-shaped mould problem. Adopts a generalized Newtonian formulation for inelastic non-isothermal incompressible flow under cooling conditions. Gives some attention to the transient aspects of the problem, including the motion of the melt front and the numerical deformation patterns that develop. Advocates a localized remeshing technique that tracks the moving front effectively.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Physics, Section B 221 (1983), S. 357-380 
    ISSN: 0550-3213
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1710-1712 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ion implantation has been employed to produce superposed planar waveguide structures in LiNbO3. This was achieved by constructing two optical barriers at different depths beneath the crystal surface using 1.1 and 2.2 MeV He+. The composite refractive index profile was compared with those of the two individual barriers, by means of a dark mode analysis technique based on a calculation of the reflectivity function at the coupling prism. The profiles were found to be directly additive except for a noticeable annealing effect of the first implanted barrier, and a range enhancement of the second barrier. These effects were confirmed by varying the order and temperature of the implantations. The implications of these results to possible device construction have been discussed.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Carbon nanotubes might be usefully employed in nanometre-scale engineering and electronics. Electrical conductivity measurements on the bulk material, on individual multi-walled and single-walled nanotubes and on bundles of single-walled nanotubes have revealed that they may behave as metallic, ...
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 2863-2867 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Multiple energy He+ ion implantation to increase the width of the implantation-induced refraction index barrier in LiB3O5 (LBO) is reported. Improvements in planar waveguide transmission (coupling and propagation) at the HeNe laser wavelength of 633 nm, from 5% to 45% for TE polarized light, and from 10% to 28% for TM polarized light in a ∼5-mm-long LBO planar waveguide are shown. Annealing is found to increase the transmission (coupling and propagation) at the wavelength of 633 nm of multiple-energy implanted planar LBO waveguides by as much as 24% for TE polarized light and 71% for TM polarized light. Channel waveguides in LBO fabricated by multiple-energy ion implantation through a gold wire mask and their use for second-harmonic generation are reported. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 2695-2699 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Second-harmonic generation (SHG) has been successfully performed in ion-implanted planar waveguides in KTiOPO4. The waveguides were formed by helium implantation, and SHG was achieved using type 2 zero order mode phase matching at a wavelength of ∼1.07 μm. The results indicate that the high nonlinearity of the material remains in the guiding region after ion implantation. The conversion efficiency in a typical guide is estimated at ∼25% for ∼1 μJ pulsed excitation. At a lower input power level, the harmonic green output from the waveguide is 20 times higher than that from the bulk for the same amount of fundamental power. This clearly demonstrates the advantage of using waveguides in achieving frequency doubling for integrated optical devices.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1287-1289 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is demonstrated that in optical waveguides formed by ion implantation in LiNbO3, the lower modes for the extraordinary index exist in a buried region of enhanced index, and so may be unable to couple with a surface prism. This is because a shallow region of slightly reduced index near to the surface necessitates the tunnelling of power to these "missing modes.'' The number of such modes can be inferred from a comparison of data for two different wavelengths, and confirmation of this together with an estimation of their positions may be obtained by surface stripping. By taking them into account it has been possible to model the profile index by using a stepped base to the optical well.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 11 (1981), S. 0 
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Previous reports suggest that blood monocytes and tissue epithelioid cells in patients with sarcoidosis are‘activated’, but few studies have been undertaken on human alveolar macrophages. In the present study, bronchoulveolar lavage samples have been obtained from eighteen patients with sarcoidosis and these have been compared with twenty controls and twenty-nine patients with non-granulomatous chronic inflammatory interstitial lung disease (cryptogenic fibrosing alveolitis). Assessment of the functional state of the macrophages was made by measurements of C3b receptor sites on the cell membrane, intra and extracellular lysosomal enzyme (β-D-glucosaminidase) and the degree of spreading of macrophages on glass.C3b receptor sites and intracellular levels of lysosomal enzyme were significantly reduced in sarcoidosis compared to controls; levels of extracellular enzyme in the lavage supernatant fluid and macrophage spreading were similar to controls. These features suggest that alveolar macrophages from patients with sarcoidosis are not “activated”. By contrast, in cryptogenic fibrosing alveolitis. macrophages show a greater extracellular intracellular ratio of lysosomal enzyme and more spreading, suggestive of ‘activation’.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 11 (1981), S. 0 
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A simple filter paper technique for estimating nasal secretory activity (NSA) was studied in 179 healthy adults. The technique was reproducible and NSA correlated independently with age and race (P 〈 0.001 in each case) but not with sex or smoking habits. Subjects with a past history of atopic disease (asthma, rhinitis or eczema) produced significantly more nasal secretion than those without such a history (P〈0.03). Among the former there was no significant difference in quantity of secretion recovered between those with and those without a past history of rhinitis.Increased NSA appears to be a marker of the atopic state and its measurement could be of value in the management of patients with allergic nasal disorders.
    Type of Medium: Electronic Resource
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