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  • 11
    Electronic Resource
    Electronic Resource
    A highly sensitive nuclear recoil detector based on superfluid3He-B (1995)
    Springer
    Journal of low temperature physics 101 (1995), S. 9-16 
    Details
    ISSN: 1573-7357
    Keywords: 29.40.Ym 67.57.Bc 95.55.Vj 95.35.+d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The excitations in superfluid3He have a dispersion curve in which the energy minimum does not coincide with the momentum minimum. As a result, when a mechanical resonator moves through a gas of such excitations, normal and Andreev scattering processes introduce a large asymmetry into the momentum exchange and the mechanical resonator experiences a very large drag force. A gas of such excitations is thus very easy to detect even at very low densities. We have exploited this effect to monitor the increase in excitation density in a small volume caused by a particle interaction. The working volume is filled with superfluid3He-B at around 100 μK. A particle undergoing an interaction in the volume releases a shower of quasiparticle excitations which can be detected by the increase in damping on a vibrating wire resonator. A small hole in the container allows the excitations to leak out into the outside colder liquid to reset the working liquid to the resting state. Using an existing experiment we can detect nuclear recoil interactions depositing energies as low as 500 eV. Two simple modifications should allow us to detect interactions in the 10 eV range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00754556
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  • 12
    Electronic Resource
    Electronic Resource
    Specular and diffuse scattering of quasiparticles by a macroscopic object moving through superfluid3He-B (1996)
    Springer
    Journal of low temperature physics 102 (1996), S. 103-116 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract When a wire resonator is moving in superfluid3He-B at low temperature, there is a drag force due to scattering of thermally excited quasiparticles. The form of the graph of the drag force against the wire velocity depends strongly on the type of scattering at the wire surface. The force always rises linearly at zero velocity, and it tends to a limiting value at high wire velocity. However the graph is much more sharply curved if the scattering is diffuse than if it is specular. Here we present an analytic study of the form of the graph, by making estimates of the effect of Andreev reflection of scattered quasiparticles in the superflow round the wire. We show that the differences between diffuse and specular scattering can be understood intuitively, by considering the geometrical restrictions imposed by Andreev reflection on the scattering at the wire surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00755112
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  • 13
    Electronic Resource
    Electronic Resource
    The Broadband Access Facility (2000)
    Springer
    BT technology journal 18 (2000), S. 39-41 
    Details
    ISSN: 1573-1995
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The deployment of broadband access networks will revolutionise many aspects of society in the early years of the next millennium. Manufacturers, telecommunications providers and cable television operators world-wide are investing heavily on research into networks that provide broadband multimedia services to customers. BT has developed a prototype of a full service access network that can connect customers via optical fibre, digital subscriber line or radio technologies. This paper describes the physical implementation of the prototype network and the wide range of services that it can support. This prototype network, referred to as the 'broadband access facility' is enabling BT and its partners to understand the best access architectures for a given environment through practical testing. The network now serves as an experimental platform, that can be used for communicating broadband concepts, designing operational processes, developing management solutions and testing advanced applications. The full service access networks (FSAN) initiative is a collaboration involving fourteen of the world's leading telecommunications network operators and major equipment manufacturers. Its vision is to create a shared requirements specification for access systems supporting narrowband and broadband services. This common specification will mean that broadband network components can be developed for world markets, thus raising volumes and driving down unit costs. The common system specification is based around an ATM/SDH (asynchronous transfer mode/synchronous digital hierarchy) core network, with local optical fibre distribution via an ATM PON (passive optical network). DSL (digital subscriber line) systems maximise reuse of existing copper plant. The exact DSL system used depends upon where the optical system is terminated, e.g. in the local exchange, cabinet, kerb or home. Hence this broadband access system can support a range of access architectures — this flexibility is fundamental to the consensus achieved in FSAN.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026532712829
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  • 14
    Electronic Resource
    Electronic Resource
    Electrocardiographic changes associated with the prone position (1992)
    Springer
    Journal of clinical monitoring and computing 8 (1992), S. 92-93 
    Details
    ISSN: 1573-2614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01618095
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  • 15
    Electronic Resource
    Electronic Resource
    Delivery of IP over Broadband Access Technologies (2000)
    Springer
    BT technology journal 18 (2000), S. 58-73 
    Details
    ISSN: 1573-1995
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper provides an overview of the broadband access technologies that can be used to deliver IP-based services. It describes BT's architecture for delivery of IP services over asymmetric digital subscriber line (ADSL) and then explains the evolution of this wire-line delivery mechanism towards higher bandwidth hybrid fibre/copper access architectures using APON and VDSL.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026732611877
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  • 16
    Electronic Resource
    Electronic Resource
    Polyblends of cement concrete and organic polymers (1974)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science: Macromolecular Reviews 9 (1974), S. 127-162 
    Details
    ISSN: 0076-2083
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1974.230090103
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  • 17
    Electronic Resource
    Electronic Resource
    Thermodynamic interactions of branched polyethylene in polar and nonpolar systems (1968)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 12 (1968), S. 789-803 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The thermodynamic properties of polymer solutions are frequently described in terms of the Flory-Huggins equation. This equation includes a parameter χ, which depends upon the intermolecular forces acting between the molecules in a solution. The experimental determination of χ was performed by an improved microtechnique and extended to a wide range of polar and nonpolar diluents of polyethylene. Careful correlations are prescribed for calculating χ from pure-component properties; they are based on an extension of the Hildebrand-Scatchard theory of solutions and on the theory of intermolecular forces. Polar (τ) and nonpolar (δ) solubility parameters are presented for a variety of solvents. For polyethylene - nonpolar solvent systems we have emphasized the factor deciding the sign of heat of mixing, while for polyethylene-polar solvent systems we have determined the contribution of dipole-induced dipole interactions ψ (δτ) in interchange-energy density B and, hence, χ.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1968.070120416
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  • 18
    Electronic Resource
    Electronic Resource
    An application of high speed membrane osmometry to the unfractionated vinylpyrrolidone-vinyl acetate copolymers (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 5 (1967), S. 851-854 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.110050923
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