ESR of Cu and Gd as a Probe of Chemical Reaction Rates in R-Ba-Cu-O (R=Y, Gd) and Related Systems

1999 ◽  
pp. 439-442
Author(s):  
Kazushi Sugawara ◽  
Keiji Yamamoto ◽  
Katsuyoshi Hotta ◽  
Haruo Hirose
Keyword(s):  
Chemical Reaction ◽  
Reaction Rates ◽  
Chemical Reaction Rates

Chemical-Reaction Rates in Non-equilibrium Viscous Compressible Flows

2008 ◽  
Author(s):  
E.V. Kustova ◽  
E. A. Nagnibeda ◽  
D. Giordano ◽  
Takashi Abe
Keyword(s):  
Chemical Reaction ◽  
Compressible Flows ◽  
Reaction Rates ◽  
Viscous Compressible Flows ◽  
Chemical Reaction Rates ◽  
Non Equilibrium

Ignition and combustion of a hydrogen jet in air with finite chemical reaction rates

1974 ◽  
Vol 10 (1) ◽  
pp. 56-62
Author(s):  
V. K. Baev ◽  
V. I. Golovichev ◽  
V. I. Dimitrov ◽  
V. A. Yasakov
Keyword(s):  
Chemical Reaction ◽  
Reaction Rates ◽  
Ignition And Combustion ◽  
Chemical Reaction Rates

Investigation of Sensitivity of Complex Reacting Systems to Chemical Reaction Rates

1972 ◽  
Author(s):  
John H. Schaibly ◽  
Russell E. Duff
Keyword(s):  
Chemical Reaction ◽  
Reaction Rates ◽  
Reacting Systems ◽  
Chemical Reaction Rates

scholarly journals On the segregation of chemical species in a clear boundary layer over heterogeneous land surfaces

2011 ◽  
Vol 11 (20) ◽  
pp. 10681-10704 ◽  
Author(s):  
H. G. Ouwersloot ◽  
J. Vilà-Guerau de Arellano ◽  
C. C. van Heerwaarden ◽  
L. N. Ganzeveld ◽  
M. C. Krol ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Chemical Reaction ◽  
Wind Direction ◽  
Rain Forest ◽  
Reaction Rates ◽  
Heterogeneous Surface ◽  
Background Wind ◽  
Homogeneous Surface ◽  
Surface Conditions ◽  
Chemical Reaction Rates

Abstract. Using a Large-Eddy Simulation model, we have systematically studied the inability of boundary layer turbulence to efficiently mix reactive species. This creates regions where the species are accumulated in a correlated or anti-correlated way, thereby modifying the mean reactivity. We quantify this modification by the intensity of segregation, IS, and analyse the driving mechanisms: heterogeneity of the surface moisture and heat fluxes, various background wind patterns and non-uniform isoprene emissions. The heterogeneous surface conditions are characterized by cool and wet forested patches with high isoprene emissions, alternated with warm and dry patches that represents pasture with relatively low isoprene emissions. For typical conditions in the Amazon rain forest, applying homogeneous surface forcings and in the absence of free tropospheric NOx, the isoprene-OH reaction rate is altered by less than 10%. This is substantially smaller than the previously assumed IS of 50% in recent large-scale model analyses of tropical rain forest chemistry. Spatial heterogeneous surface emissions enhance the segregation of species, leading to alterations of the chemical reaction rates up to 20%. The intensities of segregation are enhanced when the background wind direction is parallel to the borders between the patches and reduced in the case of a perpendicular wind direction. The effects of segregation on trace gas concentrations vary per species. For the highly reactive OH, the differences in concentration averaged over the boundary layer are less than 2% compared to homogeneous surface conditions, while the isoprene concentration is increased by as much as 12% due to the reduced chemical reaction rates. These processes take place at the sub-grid scale of chemistry transport models and therefore need to be parameterized.

A stochastic theory of chemical reaction rates. I. Formalism

1989 ◽  
Vol 56 (5-6) ◽  
pp. 879-893 ◽  
Author(s):  
Bernard Gaveau ◽  
James T. Hynes ◽  
Raymond Kapral ◽  
Michel Moreau
Keyword(s):  
Chemical Reaction ◽  
Stochastic Theory ◽  
Reaction Rates ◽  
Chemical Reaction Rates
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