Results 261 to 270 of about 71,544 (304)

Chemiluminescence as a Measurement of Local Equivalence Ratio

38th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2002
Measurements of the chemiluminescence of OH*, CH*, and C2* in laminar laboratory propane/air flames and a liquid-fueled model combustor are presented. Ratios of the emission intensity for the three species are a strong function of equivalence ratio.
Michael Brown, Terrence Meyer, Geoffrey Sturgess, Joseph Zelina, James Gord   +4 more
openaire   +1 more source

Estimation of land equivalent ratios

Journal of Applied Statistics, 1989
The estimation of the land equivalent ratios is proposed to be done by the (sum of) ratios of means of intercrop yield to sole crop yield. The bias and standard error of the estimates are obtained for large samples. Comparisons of the cropping systems have been made on the basis of these estimates and illustrated with field data.
openaire   +1 more source

Impact of Mutation Operators on the Ratio of Equivalent Mutants

2018
Software mutation is a widely used technique of software testing that consists in generating variants of a base program by applying standard modifications to its source code. One of the main obstacles in the use of software mutations is the existence of equivalent mutants, i.e.
Imen Marsit, Mohamed Nazih Omri, Ji Meng Loh, Ali Mili 0001   +3 more
openaire   +1 more source

Control of Flame Oscillations with Equivalence Ratio Modulation

Journal of Propulsion and Power, 1999
A novel technique for controlling oscillating combustion is proposed and demonstrated. For oscillations that exist over a limited range of equivalence ratios, we suggest that periodic modulation around the unstable condition can effectively avoid the oscillating condition, but otherwise produces the desired timeaverage equivalence ratio.
Geo A. Richards, Michael Janus, Edward H. Robey   +2 more
openaire   +1 more source

Premixed flame response to equivalence ratio perturbations

Combustion Theory and Modelling, 2010
This paper studies the heat-release oscillation response of premixed flames to oscillations in reactant stream fuel/air ratio. Prior analyses have studied this problem in the linear regime and have shown that heat release dynamics are controlled by the superposition of three processes: flame speed, heat of reaction, and flame surface area oscillations.
null Shreekrishna, Santosh Hemchandra, Tim Lieuwen   +2 more
openaire   +1 more source

Fuel Equivalence Ratio Imaging for Methane Jets

Applied Spectroscopy, 1993
A 2-D fuel/oxygen equivalence ratio imaging system has been developed. The technique exploits the efficient quenching of the fluorescence of organic molecules by molecular oxygen in order to determine the fuel and oxygen partial pressures simultaneously.
T. Q. Ni, L. A. Melton
openaire   +1 more source

Effect of equivalence ratio on the velocity of rotating detonation

International Journal of Hydrogen Energy, 2015
Abstract Rotating detonation engines having the advantages of high thermal efficiency, high specific impulse and simple structure, are being studied widely. Rotating detonation waves in hydrogen–oxygen mixture are experimentally and numerically studied here.
Yuhui Wang, Jianping Wang
openaire   +1 more source

Flame Emission Spectroscopy for Equivalence Ratio Monitoring

Applied Spectroscopy, 1998
The dependence of UV-visible emission characteristics in hydrocarbon flames as a function of flame equivalence ratio and total flow rate is examined for low-pressure acetylene/oxygen flames used for materials synthesis and for atmospheric-pressure methane/air flames typically seen in industrial boilers and heaters.
A. K. Sandrowitz, J. M. Cooke, N. G. Glumac   +2 more
openaire   +1 more source

Equivalent slenderness ratio for built-up members

Canadian Journal of Civil Engineering, 1993
Built-up struts that buckle about an axis perpendicular to the plane of the connectors should be treated as a "built-up" member as opposed to a "simple" member. This mode of buckling causes shear and moments in the connectors which deform the connectors.
Murray C. Temple, Ghada Elmahdy
openaire   +1 more source

Effects of Ratio Strategies Intervention on Knowledge of Ratio Equivalence for Students With Learning Disability

The Journal of Special Education, 2013
Students with mathematics learning disabilities have a weak understanding of mathematical concepts that underlie success in Algebra I, such as ratios and proportional reasoning. In this study, researchers used a multiple baseline across participants design to evaluate the effects of a intervention based on a instructional trajectory of how students ...
Hunt, Jessica H., Vasquez, Eleazar
openaire   +2 more sources