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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 32 for “"light-off"”.
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The use of chemiluminesence for light-off detection of flames
A fast response method for detection of light-off in gaseous flames and liquid spray flames has been developed. The method used chemiluminescent signals from the 2Σ - ²π OH system centered at 309 nm and the ²Δ - ²π CH system centered at 430 nm to indicate the presence of a flame. Spectral scans …
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Effects of engine operating conditions on catalyst light-off and combustion variability
… engine generations. At the same time, trade-offs can limit important design parameters necessitating fundamental understanding of the parameters involved. Toxic tail pipe emissions of gasoline engines are often associated with the efficiency of three-way catalytic converters and the time they …
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Impact of retarded spark timing on engine combustion, hydrocarbon emissions, and fast catalyst light-off
… (HC) emissions, feed gas enthalpy, and catalyst light-off. Engine experiments were conducted at cold engine conditions for various ignition timings and air/ fuel ratios. Chemical and thermal energy of the exhaust gas was tracked from cylinder-exit to the catalytic converter inlet using a variety …
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Decoherence, Master Equation for Open Quantum Systems, and the Subordination Theory
… of a form of anomalous decoherence that sheds light into the spectroscopy of blinking quantum dots. The system studied is a two-state system, interacting with an external environment that has the effect of establishing an interaction between the two states, via a coherence generating coupling, …
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An Enhanced Transient Solid Oxide Fuel Cell Performance Model
… of electrolysis, and the electrochemical light off phenomenon. One key result of the electrochemical light off simulations was that the realization that electrochemical parameters such as cell potential may be used as dynamic control variables during transitional heating of the cell. …
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Effects of secondary air injection during cold start of SI engines
… converter-in emissions and improving catalyst lightoff performance during cold start. An experimental study was performed to develop a more fundamental understanding of the effects of SAI on exhaust gas emissions and catalyst light-off characteristics during cold start of a modem SI engine. The …
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Filtered Rayleigh Scattering with an Application to Force Component Decomposition
… technique that makes use of the scattering of light off particles that are much smaller than the wavelength of light that hits them (i.e., Rayleigh scattering of air molecules). The scattered laser light is altered after encountering particles in predictable ways that can be related to changes …
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Ageing Mechanisms in Automotive Catalysts
… Labcat test system, and correlation with the light-off activity of cored catalyst samples in the Horiba SIGU 2000 examined using the QUB global catalyst model. Static ageing was also conducted in the laboratory, using the BAT equation to calculate ageing times for ageing temperatures relating …
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Nanocrystalline perovskites for catalytic combustion and oxygen separation
… Ni > Co, with LaMnO3 showing the lowest light-off temperature of 420⁰C. The intrinsic catalytic activity at 650C decreased in the order: Ni > Co > Fe > Mn. Substitution of Group IIA metals for La3+ was found to increase the reaction rate of LalxAxMnO3, while higher valency dopants did not …
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Performance evaluation of diesel particulate filters on heavy-duty vehicles
… trapped particulate matter prior to the DPF light-off temperature being reached, however there was no significant impact on white smoke emissions at any temperature range. The DPF light-off temperature was determined to be between 330°F and 450°F for the Engelhard DPX and between …
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Evaluation of aged woodstove catalysts
Woodstove emission of atmospheric pollutants has been a growing concern in the last two decades, and catalytic combustors have been used in woodstoves to reduce emissions. Field tests of EPA-certified catalytic stoves have demonstrated that emission factors increase substantially after a few …
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A Custom Reflectance Goniometer and its Usage in the Development of Gain Reflectors for Electronic-Paper Applications
… to automate the collection of data reflected light off of e-paper substrates. Next, aluminum gain reflectors were fabricated and tested. Master molds were used to create daughters which were in turn laminated in Per-MX onto glass slides and then coated in aluminum. These substrates′ reflection …
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Circadian rhythms in Lhc gene expression in pharbitis nil chois
… nil Lhc gene expression was detected in constant light. This rhythm was initiated or reset to a constant phase by the initial light-on signal received by the plants, and was detectable for at least five days in constant light. The rhythm continued to be detectable for 2 cycles in constant …
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Partial and Total Oxidation of Methane in Monolithic Catalysts at Short Contact Times
… of the reactors at transient conditions such as light-off and shut-down. The objective of this work is to study total and partial oxidation of methane over Pt, Pd, and Rh catalysts for a wide range of operating conditions. Therefore, an experimental setup, which is easily applicable for modelling …
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Reducing cold start hydrocarbon emissions from port fuel injected spark ignition engines with improved management of hardware & controls
… flow reactor exhaust manifold for fast catalyst light-off. For the first cycle of cranking, delaying the intake valve opening (IVO) creates a pressure difference across the valve, resulting in strong but brief shear flow to facilitate atomization; delayed IVO also produces a cooler charge due to …
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Circadian activation of the hypothalamic-pituitary-adrenal axis may affect central, but not peripheral, effect of lithium in conditioned taste aversion learning in rats
… chloride) was performed at night (shortly after light-off) when the HPA activity shows its circadian increase. Intraperitoenal injection of lithium chloride (0.15 M, 3 ml/kg or 12 ml/kg) at night induced CTA formation and the HPA axis activation and increased c-Fos expression in both the …
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Dynamic surface temperature measurement on the first stage turbine blades in a turbofan jet engine test rig
… The investigation concentrated on the light-off starting transient and the transients obtained during accelerating and decelerating between power settings. During starting and acceleration transients, the blade surface temperature gradient was observed to reverse. This phenomenon was …
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Structure sensitivity of H2/D2 Isotopic Exchange on Pt/Al2O3 catalysts
… (from 0 to equilibrium conversion) by performing light-off experiments and differential analysis (low conversions) by performing Arrhenius experiments in the low and high coverage regions.
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The use of chemiluminescence for detection of ignition, temperature, and fuel-to-air ratio of flames
… OH and CH signals were recorded by performing light-off ignition and intermittent ignition flame tests. These signal histories were compared to histories obtained using the original apparatus. The fuel-to-air ratio and temperature detection method was investigated by recording the spectra of …
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Catalytic properties, densification and mechanical properties of nanocrystalline yttria-zirconia-based materials
… and 25 wt% Mn203-doped 7YZ showed remarkably low light-off temperatures of 3750C and 3580C, respectively. These catalysts were highly attractive as they were competitive with the much more expensive supported noble metal catalysts. Their catalytic activity could be attributed to the availability …
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