Role of density fluctuations in bimolecular reaction kinetics

1978 ◽  
Vol 28 (1-2) ◽  
pp. 215-218 ◽  
Author(s):  
A.A. Ovchinnikov ◽  
Ya.B. Zeldovich
Keyword(s):  
Reaction Kinetics ◽  
Bimolecular Reaction ◽  
Density Fluctuations

Role of Ti and Y in the nucleation of the primary α-Al of Al7075–Ti–Y natural composites and influence of ultrasonic vibration

2021 ◽  
Vol 112 (8) ◽  
pp. 652-664
Author(s):  
Xiao-Hui Chen ◽  
Lei Liu ◽  
Jinbo Li ◽  
Fayun Zhang
Keyword(s):  
Reaction Kinetics ◽  
Grain Refinement ◽  
Ultrasonic Vibration ◽  
Nano Particles ◽  
Influencing Mechanism ◽  
Ultrasonic Time ◽  
Natural Composites ◽  
Corrosion Pits ◽  
Main Factor

Abstract Al7075–Ti–Y natural composites were prepared by using a combination of ultrasonic vibration and casting. The effects of titanium (Ti) and yttrium (Y) on the nucleation of primary α-Al were studied and the influencing mechanism of Y on the TiAl3 formation was analysed. Furthermore, a reaction kinetics model of TiAl3 under ultrasonic vibration was established. The results showed that the uniformly distributed TiAl3 and Al3Y nano-particles resulted in grain refinement. Y changed the morphology of TiAl3 and the appearance of corrosion pits was related to the fact that Y was dissolved within the TiAl3 structure to form Ti(Al,Y)3. The established model revealed that ultrasonic vibration significantly promoted the formation of TiAl3, and that ultrasonic time was the main factor affecting its growth.

scholarly journals Role of growth rate on the orientational alignment of Escherichia coli in a slit

2017 ◽  
Vol 4 (6) ◽  
pp. 170463 ◽  
Author(s):  
Julian Sheats ◽  
Bianca Sclavi ◽  
Marco Cosentino Lagomarsino ◽  
Pietro Cicuta ◽  
Kevin D. Dorfman
Keyword(s):  
Escherichia Coli ◽  
Growth Rate ◽  
Aspect Ratio ◽  
Density Fluctuations ◽  
Global Alignment ◽  
Similar Amount ◽  
Cell Area ◽  
Nematic Ordering ◽  
Side Walls

We present experimental data on the nematic alignment of Escherichia coli bacteria confined in a slit, with an emphasis on the effect of growth rate and corresponding changes in cell aspect ratio. Global alignment with the channel walls arises from the combination of local nematic ordering of nearby cells, induced by cell division and the elongated shape of the cells, and the preferential orientation of cells proximate to the side walls of the slit. Decreasing the growth rate leads to a decrease in alignment with the walls, which is attributed primarily to effects of changing cell aspect ratio rather than changes in the variance in cell area. Decreasing confinement also reduces the degree of alignment by a similar amount as a decrease in the growth rate, but the distribution of the degree of alignment differs. The onset of alignment with the channel walls is coincident with the slits reaching their steady-state occupancy and connected to the re-orientation of locally aligned regions with respect to the walls during density fluctuations.

Abiotic amidine and guanidine hydrolysis of lamotrigine-N2-glucuronide and related compounds in wastewater: The role of pH and N2-substitution on reaction kinetics

2016 ◽  
Vol 100 ◽  
pp. 466-475 ◽  
Author(s):  
Bozo Zonja ◽  
Antonio Delgado ◽  
J. Luis Abad ◽  
Sandra Pérez ◽  
Damià Barceló
Keyword(s):  
Reaction Kinetics ◽  
Hydrolysis Of ◽  
Related Compounds

Effectiveness of a partially wetted catalyst for bimolecular reaction kinetics

AIChE Journal ◽  
1988 ◽  
Vol 34 (8) ◽  
pp. 1361-1366 ◽  
Author(s):  
Gregory A. Funk ◽  
Michael P. Harold ◽  
Ka M. Ng
Keyword(s):  
Reaction Kinetics ◽  
Bimolecular Reaction
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