The Experts below are selected from a list of 240 Experts worldwide ranked by ideXlab platform
Gilles Bourque - One of the best experts on this subject based on the ideXlab platform.
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a rapid compression machine study of the oxidation of propane in the Negative temperature Coefficient regime
Combustion and Flame, 2008Co-Authors: S. M. Gallagher, Darren Healy, Henry J. Curran, John M. Simmie, Wayne K. Metcalfe, Gilles BourqueAbstract:Abstract The oxidation of propane has been studied in the temperature range 680–970 K at compressed gas pressures of 21, 27, and 37 atm and at varying equivalence ratios of 0.5, 1.0, and 2.0. These data are consistent with other experiments presented in the literature for alkane fuels in that, when ignition delay times are plotted as a function of temperature, a characteristic Negative Coefficient behavior is observed. In addition, these data were simulated using a detailed chemical kinetic model. It was found that qualitatively the model correctly simulated the effect of change in equivalence ratio and pressure, predicting that fuel-rich, high-pressure mixtures ignite fastest, while fuel-lean, low-pressure mixtures ignite slowest. Moreover, reactivity as a function of temperature is well captured, with the model predicting Negative temperature Coefficient behavior similar to the experiments. Quantitatively the model is faster than experiment for all mixtures at the lowest temperatures (650–750 K) and is also faster than experiment throughout the entire temperature range for fuel-lean mixtures.
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A rapid compression machine study of the oxidation of propane in the Negative temperature Coefficient regime
Combustion and Flame, 2008Co-Authors: S. M. Gallagher, Darren Healy, Henry J. Curran, John M. Simmie, Wayne K. Metcalfe, Gilles BourqueAbstract:The oxidation of propane has been studied in the temperature range 680-970 K at compressed gas pressures of 21, 27, and 37 atm and at varying equivalence ratios of 0.5, 1.0, and 2.0. These data are consistent with other experiments presented in the literature for alkane fuels in that, when ignition delay times are plotted as a function of temperature, a characteristic Negative Coefficient behavior is observed. In addition, these data were simulated using a detailed chemical kinetic model. It was found that qualitatively the model correctly simulated the effect of change in equivalence ratio and pressure, predicting that fuel-rich, high-pressure mixtures ignite fastest, while fuel-lean, low-pressure mixtures ignite slowest. Moreover, reactivity as a function of temperature is well captured, with the model predicting Negative temperature Coefficient behavior similar to the experiments. Quantitatively the model is faster than experiment for all mixtures at the lowest temperatures (650-750 K) and is also faster than experiment throughout the entire temperature range for fuel-lean mixtures. © 2007 The Combustion Institute.
Chang-soo Park - One of the best experts on this subject based on the ideXlab platform.
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Coherence Free All Optical Microwave Notch Filter with Negative Coefficient Based on Polarization Modulation in an Electro-optic Phase Modulator
OFC NFOEC 2007 - 2007 Conference on Optical Fiber Communication and the National Fiber Optic Engineers Conference, 2007Co-Authors: Choong Keun Oh, Chang-soo ParkAbstract:We propose a coherence-free all-optical microwave notch filter with Negative and positive Coefficients from single optical source based on polarization modulation. The experimental result shows the stable notch filter characteristics with FSR of 3.97 GHz.
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Tunable Photonic Microwave Notch Filter With Negative Coefficient Based on Polarization Modulation
IEEE Photonics Technology Letters, 2007Co-Authors: Choong Keun Oh, Chang-soo ParkAbstract:A novel tunable photonic microwave notch filter with Negative and positive Coefficients is proposed and experimentally demonstrated. The Coefficients can be achieved by polarization modulation along with an electrical signal. The two polarization-modulated signals, which have a relative time delay, are combined, and detected by a photodetector. The transfer response of the filter shows a very stable operation irrespective of the coherence length of the source used. Moreover, the free spectral range of the filter, which shows a sharp notch, can be changed by using a tunable differential group delay generator over the range of 3.16-4.31 GHz
S. M. Gallagher - One of the best experts on this subject based on the ideXlab platform.
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a rapid compression machine study of the oxidation of propane in the Negative temperature Coefficient regime
Combustion and Flame, 2008Co-Authors: S. M. Gallagher, Darren Healy, Henry J. Curran, John M. Simmie, Wayne K. Metcalfe, Gilles BourqueAbstract:Abstract The oxidation of propane has been studied in the temperature range 680–970 K at compressed gas pressures of 21, 27, and 37 atm and at varying equivalence ratios of 0.5, 1.0, and 2.0. These data are consistent with other experiments presented in the literature for alkane fuels in that, when ignition delay times are plotted as a function of temperature, a characteristic Negative Coefficient behavior is observed. In addition, these data were simulated using a detailed chemical kinetic model. It was found that qualitatively the model correctly simulated the effect of change in equivalence ratio and pressure, predicting that fuel-rich, high-pressure mixtures ignite fastest, while fuel-lean, low-pressure mixtures ignite slowest. Moreover, reactivity as a function of temperature is well captured, with the model predicting Negative temperature Coefficient behavior similar to the experiments. Quantitatively the model is faster than experiment for all mixtures at the lowest temperatures (650–750 K) and is also faster than experiment throughout the entire temperature range for fuel-lean mixtures.
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A rapid compression machine study of the oxidation of propane in the Negative temperature Coefficient regime
Combustion and Flame, 2008Co-Authors: S. M. Gallagher, Darren Healy, Henry J. Curran, John M. Simmie, Wayne K. Metcalfe, Gilles BourqueAbstract:The oxidation of propane has been studied in the temperature range 680-970 K at compressed gas pressures of 21, 27, and 37 atm and at varying equivalence ratios of 0.5, 1.0, and 2.0. These data are consistent with other experiments presented in the literature for alkane fuels in that, when ignition delay times are plotted as a function of temperature, a characteristic Negative Coefficient behavior is observed. In addition, these data were simulated using a detailed chemical kinetic model. It was found that qualitatively the model correctly simulated the effect of change in equivalence ratio and pressure, predicting that fuel-rich, high-pressure mixtures ignite fastest, while fuel-lean, low-pressure mixtures ignite slowest. Moreover, reactivity as a function of temperature is well captured, with the model predicting Negative temperature Coefficient behavior similar to the experiments. Quantitatively the model is faster than experiment for all mixtures at the lowest temperatures (650-750 K) and is also faster than experiment throughout the entire temperature range for fuel-lean mixtures. © 2007 The Combustion Institute.
Hongqian Mu - One of the best experts on this subject based on the ideXlab platform.
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Polarity- and Shape-Switchable UWB Pulse Generation Based on a Photonic Microwave Delay-Line Filter With a Negative Tap Coefficient
IEEE Photonics Technology Letters, 2009Co-Authors: Hongqian MuAbstract:A novel and simple scheme to implement a two- or three-tap photonic microwave filter with one Negative Coefficient for polarity- and shape-switchable ultrawideband (UWB) pulse generation is proposed and demonstrated. The entire system can be reconfigured as a two- or three-tap microwave delay-line filter with one Negative Coefficient realized by operating a balanced photodetector (BPD) as a single photodetector or a BPD for the generation of UWB monocycle or doublet pulses. The polarity of the generated UWB pulses can be switched by tuning the transmission axis of the arbitrary wave plate. The proposed scheme is experimentally demonstrated. Gaussian monocycle and doublet pulses with fractional bandwidths of about 174% and 141% are generated.
Choong Keun Oh - One of the best experts on this subject based on the ideXlab platform.
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Coherence Free All Optical Microwave Notch Filter with Negative Coefficient Based on Polarization Modulation in an Electro-optic Phase Modulator
OFC NFOEC 2007 - 2007 Conference on Optical Fiber Communication and the National Fiber Optic Engineers Conference, 2007Co-Authors: Choong Keun Oh, Chang-soo ParkAbstract:We propose a coherence-free all-optical microwave notch filter with Negative and positive Coefficients from single optical source based on polarization modulation. The experimental result shows the stable notch filter characteristics with FSR of 3.97 GHz.
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Tunable Photonic Microwave Notch Filter With Negative Coefficient Based on Polarization Modulation
IEEE Photonics Technology Letters, 2007Co-Authors: Choong Keun Oh, Chang-soo ParkAbstract:A novel tunable photonic microwave notch filter with Negative and positive Coefficients is proposed and experimentally demonstrated. The Coefficients can be achieved by polarization modulation along with an electrical signal. The two polarization-modulated signals, which have a relative time delay, are combined, and detected by a photodetector. The transfer response of the filter shows a very stable operation irrespective of the coherence length of the source used. Moreover, the free spectral range of the filter, which shows a sharp notch, can be changed by using a tunable differential group delay generator over the range of 3.16-4.31 GHz
