Catalytic resonance theory: superVolcanoes, catalytic molecular pumps, and oscillatory steady state

2019 ◽  
Vol 9 (18) ◽  
pp. 5058-5076 ◽  
Author(s):  
M. Alexander Ardagh ◽  
Turan Birol ◽  
Qi Zhang ◽  
Omar A. Abdelrahman ◽  
Paul J. Dauenhauer
Keyword(s):  
Steady State ◽  
Electronic Properties ◽  
Catalytic Reactions ◽  
External Stimulus ◽  
Forced Oscillations ◽  
Resonance Theory ◽  
Stimulus Waveform

Catalytic reactions on surfaces with forced oscillations in physical or electronic properties undergo controlled acceleration consistent with the selected parameters of frequency, amplitude, and external stimulus waveform.

scholarly journals Catalytic Resonance Theory: SuperVolcanoes, Catalytic Molecular Pumps, and Oscillatory Steady State

2019 ◽  
Author(s):  
M. Alexander Ardagh ◽  
Turan Birol ◽  
Qi Zhang ◽  
Omar Abdelrahman ◽  
Paul Dauenhauer
Keyword(s):  
Steady State ◽  
Forced Oscillation ◽  
Oscillation Amplitude ◽  
Catalytic Reactions ◽  
Forced Oscillations ◽  
Heat Of Reaction ◽  
Turnover Frequency ◽  
Resonance Theory ◽  
Intermediate Energies ◽  
Oscillation Frequencies

Catalytic reactions on surfaces with forced oscillations in physical or electronic properties undergo controlled acceleration consistent with the selected parameters of frequency, amplitude, and external stimulus waveform. In this work, the general reaction of reversible A-to-B chemistry is simulated by varying the catalytic (heat of reaction, transition state and intermediate energies) and oscillation parameters (frequency, amplitude, endpoints, and waveform) to evaluate the influence on the overall catalytic turnover frequency and steady state extent of conversion. Variations of catalytic cycle energies are shown to comprise a superVolcano of superimposed individual Balandin-Sabatier volcano plots, with variations in linear scaling relationships leading to unique turnover frequency response to forced oscillation of the catalyst surface. Optimization of catalytic conditions identified a band of forced oscillation frequencies leading to resonance and rate enhancement as high as 10,000x above the static Sabatier maximum. Dynamic catalytic reactions conducted at long times achieved oscillatory steady state differing from equilibrium consistent with the imposed surface oscillation amplitude acting as a ‘catalytic pump’ relative to the Gibbs free energy of reaction.

scholarly journals Catalytic Resonance Theory: SuperVolcanoes, Catalytic Molecular Pumps, and Oscillatory Steady State

2019 ◽  
Author(s):  
M. Alexander Ardagh ◽  
Turan Birol ◽  
Qi Zhang ◽  
Omar Abdelrahman ◽  
Paul Dauenhauer
Keyword(s):  
Steady State ◽  
Forced Oscillation ◽  
Oscillation Amplitude ◽  
Catalytic Reactions ◽  
Forced Oscillations ◽  
Heat Of Reaction ◽  
Turnover Frequency ◽  
Resonance Theory ◽  
Intermediate Energies ◽  
Oscillation Frequencies

Catalytic reactions on surfaces with forced oscillations in physical or electronic properties undergo controlled acceleration consistent with the selected parameters of frequency, amplitude, and external stimulus waveform. In this work, the general reaction of reversible A-to-B chemistry is simulated by varying the catalytic (heat of reaction, transition state and intermediate energies) and oscillation parameters (frequency, amplitude, endpoints, and waveform) to evaluate the influence on the overall catalytic turnover frequency and steady state extent of conversion. Variations of catalytic cycle energies are shown to comprise a superVolcano of superimposed individual Balandin-Sabatier volcano plots, with variations in linear scaling relationships leading to unique turnover frequency response to forced oscillation of the catalyst surface. Optimization of catalytic conditions identified a band of forced oscillation frequencies leading to resonance and rate enhancement as high as 10,000x above the static Sabatier maximum. Dynamic catalytic reactions conducted at long times achieved oscillatory steady state differing from equilibrium consistent with the imposed surface oscillation amplitude acting as a ‘catalytic pump’ relative to the Gibbs free energy of reaction.

scholarly journals STATIC STRAINING AND LONGITUDINAL OSCILLATIONS OF UNDERGROUND PIPELINE BUILT ON BLOCK FOUNDATION

2021 ◽  
pp. 123-133
Author(s):  
A. B. Struk ◽  
M. I. Vaskovskyi ◽  
I. P. Shatskyi ◽  
M. V. Makoviichuk
Keyword(s):  
Steady State ◽  
Stress State ◽  
Differential Equations ◽  
Analytical Solutions ◽  
Equivalent Stress ◽  
Forced Oscillations ◽  
Underground Pipeline ◽  
Underground Pipelines ◽  
Block Foundation ◽  
Static Tensile

The article considers the issues of forecasting the strength of underground pipelines, which are operated on seismically active sections of the route, composed of relatively rigid mobile blocks. According to the literature, the problems of the influence of the interaction of base faults on the stress state of the pipeline have not been studied to date. The aim of the work is to develop a model for the analysis of abnormal stresses in the underground pipeline on a damaged basis caused by static or time-harmonious mutual movement of its blocks along the axis of the pipe in the presence of several faults. Boundary value problems for differential equations of static tensile-compression and steady-state longitudinal oscillations of a tubular rod with discontinuous right-hand sides are formulated. Based on the analytical solutions of these problems for the cases of antisymmetric and symmetric displacement of the foundation blocks, the distributions of axial displacement and equivalent stress in the pipe, depending on the distance between faults and the frequency of forced oscillations, are investigated.

scholarly journals Characterization of Two BAHD Acetyltransferases Highly Expressed in the Flowers of Jasminum sambac (L.) Aiton

Plants ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 13
Author(s):  
Yuting Wang ◽  
Hongliang Zhang ◽  
Chao Wan ◽  
Xian He ◽  
Jinfeng Huang ◽  
...  
Keyword(s):  
Steady State ◽  
Ectopic Expression ◽  
Catalytic Reactions ◽  
Total Emission ◽  
Emission Pattern ◽  
Jasminum Sambac ◽  
The Tropics ◽  
Encoding Genes

Volatile benzenoid compounds are found in diverse aromatic bouquets emitted by most moth-pollinated flowers. The night-blooming Jasminum sambac is widely cultivated worldwide in the tropics and subtropics for ornamental and industrial purposes owing to its fragrant flowers. Benzylacetate is a characteristic constituent in jasmine scent which makes up to approximately 20–30% of the total emission in the headspace or extract, but the biosynthesis enzymes and the encoding genes have not yet been described. Here, we identify two cytosolic BAHD acyltransferases specifically expressed in the petals with a positive correlation closely to the emission pattern of the volatile benzenoids. Both JsBEAT1 and JsBEAT2 could use benzylalcohol and acetate-CoA as substrates to make benzylacetate in vitro. The recombinant GST-JsBEAT1 has an estimated apparent Km of 447.3 μM for benzylalcohol and 546.0 μM for acetate-CoA, whereas in the instance of the His-JsBEAT2, the Km values are marginally lower, being 278.7 and 317.3 μM, respectively. However, the catalytic reactions by the GST-JsBEAT1 are more efficient than that by the His-JsBEAT2, based on the steady-state kcat parameters. Furthermore, ectopic expression of JsBEAT1 and JsBEAT2 in the transgenic P. hybrida plants, driven by a flower-specific promotor, significantly enhances the biosynthesis of benzylbenzoate and benzylacetate, as well as the total VOCs.

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