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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Optics Communications 41 (1982), S. 121-125 
    ISSN: 0030-4018
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 37 (1985), S. 171-179 
    ISSN: 1432-0649
    Keywords: 42.55D ; 42.60B ; 58.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The performance of a compact uv photo-preionized TE laser is studied in the pressure range 1–5 bar. As the pressure is increased, the laser pulse shape is little altered, but both the peak power and the total output pulse energy increase significantly with pressure, even for constant input electrical energy. For various gas mixtures and excitation source capacitors the measurements suggest approximate output energy scaling with the product of the source charge per unit electrode area [C.m−2] and the molecular partial pressure [CO2+N2+CO]. This is explained in terms of the pressure-dependent discharge impedance. An input-energy-related discharge instability limits the optimum laser pressure to 1.5–2.5 bar, and we show that, at constant input energy, the instability boundary depends on the molecular partial pressure alone. The pre-ionization photo-electron yield varies negligibly with pressure, but the discharge tolerance to added oxygen decreases asp −3 top −4, dependent on gas mixture. Nevertheless sealed operation for 〉105 shots has been obtained with a 5% CO2∶5% CO∶3% N2∶2% H2∶85% He gas mixture at a total pressure of 5 bar.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    BT technology journal 16 (1998), S. 138-151 
    ISSN: 1573-1995
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Improvements in system technologies continue apace — with new developments in software methods arguably outstripping even the breakneck progress in hardware power described by 'Moore's Law'. The software developments are timely, since they offer solutions to the urgent problems of increasing customer demands, complexity of network technologies, and more competitive markets. The increasing availability of cheap computing power, with developments in object orientation and artificial intelligence, offer the possibility of a more holistic approach to network performance planning and management. The most fundamental aspects of network performance (functionality, reliability, and cost) can now feasibly be considered simultaneously and interactively. Common, comprehensive network models are within sight, which could be utilised by network planners, installers, repair staff, marketeers and at point-of-sale. The resulting improvements in productivity and service quality could be immense. Specific examples of 'intelligent' access network planning tools, produced using rapid application development techniques within BT, are described to illustrate their potential.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    BT technology journal 18 (2000), S. 32-41 
    ISSN: 1573-1995
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The optimal design of telecommunications network infrastructure demands consideration of many complex factors such as type, number and position of components and cable paths. The difficulty of producing a consistent and cost-effective solution increases with network size and complexity. A genetic optimisation system, GenOSys, developed at BT, can generate different network configurations and evaluate them rapidly to arrive at an optimal or near-optimal solution. GenOSys has been employed with great success in new site planning offices of networkBT for more than a year. This paper reviews the operation of GenOSys and summarises the key steps in the practical application of the algorithms. In addition, the business benefits provided by the GenOSys planning tool in the working environment are analysed.
    Type of Medium: Electronic Resource
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