The Experts below are selected from a list of 138 Experts worldwide ranked by ideXlab platform
J.p. Meunier - One of the best experts on this subject based on the ideXlab platform.
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Characterization of asymmetric graded-index planar optical waveguides from the knowledge of TE/sub 0/-TE/sub 1/ mode cutoff wavelengths
IEEE Photonics Technology Letters, 1991Co-Authors: S.i. Hosain, J.p. MeunierAbstract:The authors have proposed (1991) a simple method for predicting the index Profile Parameter (the Profile exponent q in case of a power law Profile or the aspect ratio S in case of trapezoidal index Profile) of a graded-index optical fiber which is single moded in the 1.3-1.55 mu m wavelength range from a measurement of the LP/sub 11/ and LP/sub 02/ cutoff wavelengths. They extend the method with appropriate modification to determine the asymmetry Parameter sigma , the maximum refractive index n/sub f/ and the characteristic thickness d of the guiding layer of a few-moded graded-index asymmetric planar optical waveguide from a measurement of the TE/sub 0/ and TE/sub 1/ cutoff wavelengths. The method is simple and can give firsthand information about these Parameters with reasonably good accuracy.
Tom E Baldock - One of the best experts on this subject based on the ideXlab platform.
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Hysteresis in the evolution of beach Profile Parameters under sequences of wave climates - Part 2; Modelling
Coastal Engineering, 2018Co-Authors: F. Birrien, Taiyu Shimamoto, A Atkinson, Tom E BaldockAbstract:Disequilibrium-type models for two beach Profile Parameters, P, the shoreline position and net bulk sediment transport, are developed for laboratory experiments that demonstrate morphological hysteresis in the evolution to equilibrium of beach Profiles under sequences of different wave climates. The model principle follows the classical disequilibrium approach but with non-monotonic relationships between the forcing and the chosen beach Profile Parameter at equilibrium, Peq, previously verified and presented in part 1 of this work (Baldock et al., 2017). Two such relationships are required to model beach Profile evolution that exhibits morphological hysteresis. The model coefficients are derived for monochromatic and random wave experiments and subsequently used to model data obtained from cyclic erosive and accretive wave conditions of shorter durations, alternating through multiple cycles. In these conditions equilibrium conditions were not reached and hysteresis does not occur. The model is used to investigate the morphological feedback between the outer and inner bars and the resulting behaviour of the bulk transport, and the relative depth over the bar crest is shown to be an attractor in this case. The model coefficients and morphological time-scales derived from the cyclic experiments are very similar to those derived from the equilibrium experiments for the bulk transport. Normalised mean square model errors range from 1% to 20% when applied to independent data. The data from the cyclic wave conditions can be inverted to derive the conditions expected at equilibrium, which match those observed, indicating a robust model relationship between the forcing and Peq. The relationship between the forcing and Peqcan also be determined directly from the cyclic experiments. This approach may be more robust than determining the relationship from periods where P is stationary since, in a time-series of P versus the forcing, stationary points can occur due to changes in wave conditions, in addition to the instances when P=Peq.
Dhiraj Wadhera - One of the best experts on this subject based on the ideXlab platform.
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statistical models of holland pressure Profile Parameter and radius to maximum winds of hurricanes from flight level pressure and h wind data
Journal of Applied Meteorology and Climatology, 2008Co-Authors: Peter J Vickery, Dhiraj WadheraAbstract:Abstract In many hurricane risk models the inclusion of the Holland B Parameter plays an important role in the risk prediction methodology. This paper presents an analysis of the relationship between B and a nondimensional intensity Parameter. The nondimensional Parameter includes the strong negative correlation of B with increasing hurricane size [as defined by the radius to maximum winds (RMW)] and latitude as well as a positive correlation with sea surface temperature. A weak positive correlation between central pressure deficit and B is also included in the single Parameter term. Alternate statistical models relating B to RMW and latitude are also developed. Estimates of B are derived using pressure data collected during hurricane reconnaissance flights, coupled with additional information derived from the Hurricane Research Division’s H*Wind snapshots of hurricane wind fields. The reconnaissance data incorporate flights encompassing the time period 1977 through 2001, but the analysis was limited to i...
S.i. Hosain - One of the best experts on this subject based on the ideXlab platform.
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Characterization of asymmetric graded-index planar optical waveguides from the knowledge of TE/sub 0/-TE/sub 1/ mode cutoff wavelengths
IEEE Photonics Technology Letters, 1991Co-Authors: S.i. Hosain, J.p. MeunierAbstract:The authors have proposed (1991) a simple method for predicting the index Profile Parameter (the Profile exponent q in case of a power law Profile or the aspect ratio S in case of trapezoidal index Profile) of a graded-index optical fiber which is single moded in the 1.3-1.55 mu m wavelength range from a measurement of the LP/sub 11/ and LP/sub 02/ cutoff wavelengths. They extend the method with appropriate modification to determine the asymmetry Parameter sigma , the maximum refractive index n/sub f/ and the characteristic thickness d of the guiding layer of a few-moded graded-index asymmetric planar optical waveguide from a measurement of the TE/sub 0/ and TE/sub 1/ cutoff wavelengths. The method is simple and can give firsthand information about these Parameters with reasonably good accuracy.
F. Birrien - One of the best experts on this subject based on the ideXlab platform.
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Hysteresis in the evolution of beach Profile Parameters under sequences of wave climates - Part 2; Modelling
Coastal Engineering, 2018Co-Authors: F. Birrien, Taiyu Shimamoto, A Atkinson, Tom E BaldockAbstract:Disequilibrium-type models for two beach Profile Parameters, P, the shoreline position and net bulk sediment transport, are developed for laboratory experiments that demonstrate morphological hysteresis in the evolution to equilibrium of beach Profiles under sequences of different wave climates. The model principle follows the classical disequilibrium approach but with non-monotonic relationships between the forcing and the chosen beach Profile Parameter at equilibrium, Peq, previously verified and presented in part 1 of this work (Baldock et al., 2017). Two such relationships are required to model beach Profile evolution that exhibits morphological hysteresis. The model coefficients are derived for monochromatic and random wave experiments and subsequently used to model data obtained from cyclic erosive and accretive wave conditions of shorter durations, alternating through multiple cycles. In these conditions equilibrium conditions were not reached and hysteresis does not occur. The model is used to investigate the morphological feedback between the outer and inner bars and the resulting behaviour of the bulk transport, and the relative depth over the bar crest is shown to be an attractor in this case. The model coefficients and morphological time-scales derived from the cyclic experiments are very similar to those derived from the equilibrium experiments for the bulk transport. Normalised mean square model errors range from 1% to 20% when applied to independent data. The data from the cyclic wave conditions can be inverted to derive the conditions expected at equilibrium, which match those observed, indicating a robust model relationship between the forcing and Peq. The relationship between the forcing and Peqcan also be determined directly from the cyclic experiments. This approach may be more robust than determining the relationship from periods where P is stationary since, in a time-series of P versus the forcing, stationary points can occur due to changes in wave conditions, in addition to the instances when P=Peq.
