Results 261 to 270 of about 13,168,725 (351)

Long-Term Speech Outcomes in Moderate-to-Severe Childhood Speech Sound Disorder: A Systematic Review. [PDF]

Int J Lang Commun Disord
Garrett AJ, Tukel S, Morgan AT.
europepmc   +1 more source

Addition of early vocational advice to usual primary care on sickness absence in employed adults: exploratory findings from the discontinued WAVE Randomised Controlled Trial.

Health Technol Assess
Wynne-Jones G, Lewis M, Sowden G, Madan I, Walker-Bone K, Chew-Graham CA, Bromley K, Jowett S, Parsons V, Mansell G, Cooke K, Saunders B, Harrison R, Lawton SA, Wathall S, Pemberton J, Hammond J, Cooper C, Foster ANE.   +18 more
europepmc   +1 more source

Inverse design of frustrated Lewis pairs for direct catalytic CO₂ hydrogenation: refining and expanding design rules. [PDF]

Chem Sci
Das S, Laplaza R, Worakul T, Corminboeuf C.   +3 more
europepmc   +1 more source

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Assessment of the method for calculating the Lewis number of H2/CO/CH4 mixtures and comparison with experimental results

International Journal of Hydrogen Energy, 2017
Denis Lapalme, R. Lemaire, P. Seers
semanticscholar   +3 more sources

Lewis number and preferential diffusion effects in lean hydrogen–air highly turbulent flames

The Physics of Fluids, 2022
Unsteady three-dimensional direct numerical simulations of highly turbulent, complex-chemistry, lean hydrogen-air flames were performed by changing the equivalence ratio [Formula: see text], root mean square velocity [Formula: see text], and turbulence ...
H. Lee, P. Dai, M. Wan, A. Lipatnikov
semanticscholar   +1 more source

Effects of strain rate and Lewis number on forced ignition of laminar counterflow diffusion flames

Combustion and Flame, 2021
Forced ignition is one of the most fundamental and important combustion problems. It is used in advanced engines and closely related to fire safety and accidental explosion.
Shumeng Xie, Zhanbin Lu, Zheng Chen
semanticscholar   +1 more source

Identification of the extinction mechanism of lean limit hydrogen flames based on Lewis number effect

, 2021
The conventional flame stretch analysis showed some technical limitations in describing the observed extinction mechanism without considering the heat transfer characteristics related to flame flow patterns.
J. Jeon, Doyoung Shin, W. Choi, S. J. Kim   +3 more
semanticscholar   +1 more source

High-Lewis number premixed flame instabilities

2021
Lean premixtures of high-molecular weight practical fuels typically have an associated Lewis number (Le) in excess of one and are susceptible to diffusive-thermal instabilities depending on the heat loss and hydrodynamic strain. These instabilities may lead to incomplete combustion, an increase in undesirable emissions and complex pressure oscillations.
Yi Ma, Howard Pearlman
openaire   +1 more source