scholarly journals Experimental and theoretical study of processes leading to steady-state sound in annular thermoacoustic engines

2005 ◽  
Vol 72 (1) ◽  
Author(s):  
G. Penelet ◽  
V. Gusev ◽  
P. Lotton ◽  
M. Bruneau
Keyword(s):  
Steady State ◽  
Theoretical Study ◽  
Thermoacoustic Engines

scholarly journals Theoretical study of the generation of soap films: role of interfacial visco-elasticity

2013 ◽  
Vol 739 ◽  
pp. 124-142 ◽  
Author(s):  
Jacopo Seiwert ◽  
Benjamin Dollet ◽  
Isabelle Cantat
Keyword(s):  
Steady State ◽  
Liquid Film ◽  
Capillary Number ◽  
Theoretical Study ◽  
Surfactant Solution ◽  
Constant Thickness ◽  
Interfacial Rheology ◽  
Soap Films ◽  
Elastic Case

AbstractIn this work, we study theoretically the thickness of a liquid film (typically made of a surfactant solution) pulled out of a bath at constant speed in the absence of gravity, when it features a viscous or an elastic interfacial rheology. We show that a purely viscous rheology does not lead to the extraction of a steady state film of constant thickness. In contrast, the thickness of the film is well defined in the elastic case, which allows us to compute it. This thickness depends on the capillary number of the experiment, and on the elasticity of the interface. It is always lower than or equal to that obtained for an incompressible interface predicted by Frankel (Mysels, Shinoda and Frankel, Soap Films: Studies of their Thinning and a Bibliography, 1959), which is recovered in the limit of an arbitrary large elasticity.

scholarly journals Ultrafast dynamics of carriers and phonons of photoinjected double-plasma in aluminium nitride

2021 ◽  
Vol 67 (2 Mar-Apr) ◽  
pp. 318
Author(s):  
C. Gonçalves Rodrigues ◽  
R. Luzzi
Keyword(s):  
Steady State ◽  
Aluminum Nitride ◽  
Electric Fields ◽  
Scientific Community ◽  
Theoretical Study ◽  
Operator Method ◽  
Ultrafast Dynamics ◽  
Transient Transport ◽  
Nonequilibrium Temperature ◽  
Statistical Operator

Aluminum nitride is attracting great interest of the industry and scientific community due to its interesting properties. In this paper is performed a theoretical study on the ultrafast transient transport properties of photoinjected carriers in wurtzite AlN subjected to electric fields up to 80 kV/cm. For this, the Nonequilibrium Statistical Operator Method was used. The evolution towards the steady state of drift velocity of carriers (electrons and holes) and nonequilibrium temperature (carriers and phonons) subpicosecond scale were determined.

scholarly journals Surfing the Hyperbola Equations of the Steady-State Farquhar–von Caemmerer–Berry C3 Leaf Photosynthesis Model: What Can a Theoretical Analysis of Their Oblique Asymptotes and Transition Points Tell Us?

2019 ◽  
Vol 82 (1) ◽  
Author(s):  
Jon Miranda-Apodaca ◽  
Emilio L. Marcos-Barbero ◽  
Rosa Morcuende ◽  
Juan B. Arellano
Keyword(s):  
Steady State ◽  
Theoretical Analysis ◽  
Nitrogen Assimilation ◽  
Theoretical Study ◽  
Mesophyll Conductance ◽  
Leaf Photosynthesis ◽  
Rectangular Hyperbola ◽  
Quadratic Equations ◽  
Transition Points ◽  
Limiting Values

AbstractThe asymptotes and transition points of the net CO2 assimilation (A/Ci) rate curves of the steady-state Farquhar–von Caemmerer–Berry (FvCB) model for leaf photosynthesis of C3 plants are examined in a theoretical study, which begins from the exploration of the standard equations of hyperbolae after rotating the coordinate system. The analysis of the A/Ci quadratic equations of the three limitation states of the FvCB model—abbreviated as Ac, Aj and Ap—allows us to conclude that their oblique asymptotes have a common slope that depends only on the mesophyll conductance to CO2 diffusion (gm). The limiting values for the transition points between any two states of the three limitation states c, j and p do not depend on gm, and the results are therefore valid for rectangular and non-rectangular hyperbola equations of the FvCB model. The analysis of the variation of the slopes of the asymptotes with gm casts doubts about the fulfilment of the steady-state conditions, particularly, when the net CO2 assimilation rate is inhibited at high CO2 concentrations. The application of the theoretical analysis to extended steady-state FvCB models, where the hyperbola equations of Ac, Aj and Ap are modified to accommodate nitrogen assimilation and amino acids export via the photorespiratory pathway, is also discussed.

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