The Experts below are selected from a list of 8175 Experts worldwide ranked by ideXlab platform

John E. Midwinter - One of the best experts on this subject based on the ideXlab platform.

  • Modelling of transmission nonlinearities and Fibre Parameter optimisation in dense WDM systems with optical amplifiers
    IEE Colloquium on High Speed and Long Distance Optical Transmission, 1996
    Co-Authors: D. Rothnie, W. Zeiler, Polina Bayvel, John E. Midwinter
    Abstract:

    Upgrading standard Fibre (CSMF) using dispersion correcting Fibre (DCF) is an attractively simple and low cost method of breaching dispersion-limited transmission distances. The DCF is designed such that it has high, negative chromatic dispersion and with an appropriate length can compensate for the dispersion which has accumulated in standard Fibre at a particular wavelength. A number of alternative dispersion-management schemes have been proposed and demonstrated for future high bit-rate Fibre networks but in the main these works have concentrated on either CSMF as the compensator for lengths of dispersion shifted Fibre (DSF) or by sections of DSF with alternating dispersion sign. We present simulation results that highlight the improvement of transmission distance by positioning the compensator at the beginning of each span and how the three Kerr nonlinearities, self-phase modulation (SPM), cross-phase modulation (CPM) and four-wave mixing (FWM), are suppressed by the to two important DCF Parameters: dispersion and loss.

D. Rothnie - One of the best experts on this subject based on the ideXlab platform.

  • Modelling of transmission nonlinearities and Fibre Parameter optimisation in dense WDM systems with optical amplifiers
    IEE Colloquium on High Speed and Long Distance Optical Transmission, 1996
    Co-Authors: D. Rothnie, W. Zeiler, Polina Bayvel, John E. Midwinter
    Abstract:

    Upgrading standard Fibre (CSMF) using dispersion correcting Fibre (DCF) is an attractively simple and low cost method of breaching dispersion-limited transmission distances. The DCF is designed such that it has high, negative chromatic dispersion and with an appropriate length can compensate for the dispersion which has accumulated in standard Fibre at a particular wavelength. A number of alternative dispersion-management schemes have been proposed and demonstrated for future high bit-rate Fibre networks but in the main these works have concentrated on either CSMF as the compensator for lengths of dispersion shifted Fibre (DSF) or by sections of DSF with alternating dispersion sign. We present simulation results that highlight the improvement of transmission distance by positioning the compensator at the beginning of each span and how the three Kerr nonlinearities, self-phase modulation (SPM), cross-phase modulation (CPM) and four-wave mixing (FWM), are suppressed by the to two important DCF Parameters: dispersion and loss.

Du Xianghong - One of the best experts on this subject based on the ideXlab platform.

  • Compressive behavior and microstructural properties of tailings polypropylene Fibre-reinforced cemented paste backfill
    Construction and Building Materials, 2018
    Co-Authors: Xin Chen, Xiuzhi Shi, Jian Zhou, Qiusong Chen, Du Xianghong
    Abstract:

    Abstract This experimental study was carried out to investigate the influence of polypropylene (PP) Fibre on the compressive behavior and microstructural properties of tailings (classified as CL – lean clay) cemented paste backfill (CPB). The compressive behavior was determined by the unconfined compressive strength (UCS), and structural changes in CPB were evaluated by macrostructural failure analysis and microstructural tests with scanning electron microscopy (SEM) analysis. Orthogonal tests were designed to research the influences and significance of the cement content, solid mass concentration, Fibre content and Fibre length on CPB. The results indicate that although the Fibre Parameters are not as significant as the cement content and solid mass concentration for CPB strength, they are also important factors for improving the UCS of CPB, and the effect of PP Fibre on the early (3 days curing time) and later (28 days curing time) stage strength of the backfill is much more obvious than that on the medium stage (7 days curing time) strength. And Fibre can enhance the stiffness and ductility of CPB with increasing strain and E50. In addition, the Fibre content is much more important than the Fibre length, there is no linear relationship between UCS and the Fibre Parameters (Fibre content and Fibre length), and the best Fibre Parameter levels are a Fibre content of 0.15% and a Fibre length of 6 mm in this study. Moreover, macrostructural failure analysis and SEM microstructural tests indicated that PP Fibre tend to bridge the cracks, which can reduce the porosity of the CPB matrix and improve its compactness, integrity and residual strength with some calcium silicate hydrate (C-S-H) gelling trapped on its surface.

H Iwata - One of the best experts on this subject based on the ideXlab platform.

Johan J. Hanekom - One of the best experts on this subject based on the ideXlab platform.

  • Modelled temperature-dependent excitability behaviour of a single ranvier node for a human peripheral sensory nerve Fibre
    Biological Cybernetics, 2008
    Co-Authors: Jacoba E. Smit, Tania Hanekom, Johan J. Hanekom
    Abstract:

    The objective of this study was to determine whether the Hodgkin–Huxley model for unmyelinated nerve Fibres could be modified to predict excitability behaviour at Ranvier nodes. Only the model Parameters were modified to those of human, with the equations left unaltered. A model of a single Ranvier node has been developed as part of a larger model to describe excitation behaviour in a generalised human peripheral sensory nerve Fibre. Parameter values describing the ionic and leakage conductances, corresponding equilibrium potentials, resting membrane potential and membrane capacitance of the original Hodgkin–Huxley model were modified to reflect the corresponding Parameter values for human. Parameter temperature dependence was included. The fast activating potassium current kinetics were slowed down to represent those of a slow activating and deactivating potassium current, which do not inactivate. All calculations were performed in MATLAB^TM. Action potential shape and amplitude were satisfactorily predicted at 20, 25 and 37°C, and were not influenced by activation or deactivation of the slow potassium current. The calculated chronaxie time constant was 65.5 μs at 37°C. However, chronaxie times were overestimated at temperatures lower than body temperature.