On the Mechanism of Spatial Bifurcations in the Open Flow System

1997 ◽  
Vol 07 (07) ◽  
pp. 1529-1538 ◽  
Author(s):  
Akihiro Yamaguchi
Keyword(s):  
Flow System ◽  
Coupled Map Lattice ◽  
Open Flow ◽  
Analytical Results

The phenomenon of spatial bifurcations in the open flow system (OFS), which is a unidirectionally coupled map lattice, is investigated. The bifurcation conditions are obtained by analyzing the effect of deterministic discretization of the system's state when the OFS is simulated by the computer. The analytical results are examined by application to the OFS with logistic maps.

Design and implementation of automatic control for a condensation-induced depressurization system

2018 ◽  
Vol 233 (9) ◽  
pp. 1146-1158
Author(s):  
Fen Du ◽  
Bo Zhang ◽  
Chao Zhu ◽  
Zhiming Ji ◽  
Chao-Hsin Lin
Keyword(s):  
Control System ◽  
Atmospheric Pressure ◽  
Flow System ◽  
Thermodynamic Cycle ◽  
Saturated Steam ◽  
Low Grade ◽  
Steam Condensation ◽  
Open Flow ◽  
Process Characteristics ◽  
Cascade Arrangement

This study develops a control system to automate the operation of a condensation-induced depressurization technology, which is used to achieve sub-atmospheric pressure in an open-flow system on ground. The continuous depressurization is maintained via an integrated series of chambers inside which vacuum is regenerated by condensing and refilling of saturated steam. The low pressure generated inside the chambers is then used to alternatively extract the air out of a flow system for maintaining its sub-atmospheric pressure. The thermodynamic cycle in such a vacuum chamber consists of three sub-processes: air purging to ambient by steam refilling, depressurization by steam condensation, and air-extraction from a flow application. As one chamber undergoing these consecutive processes, another chamber operates in a coordinated different phase to seamlessly maintain a continuous air-extraction operation. This new system provides a quiet and efficient way of using low-grade energy to generate hypobaric environment for needed applications. A cascade arrangement of a proposed multiple-chamber operation is also illustrated. A control system is designed and implemented to realize the automatic and coordinated operation in a dual-chamber, laboratory-scaled system. Exemplified results on process characteristics such as chamber depressurization and air purging are also provided.

Unidirectionally coupled map lattice as a model for open flow systems

1996 ◽  
Vol 54 (5) ◽  
pp. 5107-5115 ◽  
Author(s):  
Oliver Rudzick ◽  
Arkady Pikovsky
Keyword(s):  
Coupled Map Lattice ◽  
Open Flow ◽  
Flow Systems

scholarly journals Pattern dynamics of a coupled map lattice for open flow

1995 ◽  
Vol 86 (3) ◽  
pp. 428-455 ◽  
Author(s):  
Frederick H. Willeboordse ◽  
Kunihiko Kaneko
Keyword(s):  
Coupled Map Lattice ◽  
Open Flow ◽  
Pattern Dynamics

The synthesis and layer growth of zinc silicon arsenide, ZnSiAs2, by chemical vapor deposition in an open flow system

1977 ◽  
Vol 12 (10) ◽  
pp. 961-968 ◽  
Author(s):  
J.E. Andrews ◽  
A.F. Schreiner ◽  
R.B. Benson ◽  
S. Chevacharoenkul ◽  
W.M. Duncan ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Flow System ◽  
Chemical Vapor ◽  
Layer Growth ◽  
Open Flow

scholarly journals Hydrogen peroxide thermochemical oscillator as driver for primordial RNA replication

2014 ◽  
Author(s):  
Rowena Ball ◽  
John Brindley
Keyword(s):  
Hydrogen Peroxide ◽  
Flow System ◽  
Molecular System ◽  
Rna Replication ◽  
System Model ◽  
Open Flow ◽  
The Mean ◽  
Prebiotic Earth ◽  
Primordial Soup ◽  
Input Amount

This paper presents and tests a previously unrecognised mechanism for driving a replicating molecular system on the prebiotic earth. It is proposed that cell-free RNA replication in the primordial soup may have been driven by self-sustained oscillatory thermochemical reactions. To test this hypothesis a well-characterised hydrogen peroxide oscillator was chosen as the driver and complementary RNA strands with known association and melting kinetics were used as the substrate. An open flow system model for the self-consistent, coupled evolution of the temperature and concentrations in a simple autocatalytic scheme is solved numerically, and it is shown that thermochemical cycling drives replication of the RNA strands. For the (justifiably realistic) values of parameters chosen for the simulated example system, the mean amount of replicant produced at steady state is 6.56 times the input amount, given a constant supply of substrate species. The spontaneous onset of sustained thermochemical oscillations via slowly drifting parameters is demonstrated, and a scheme is given for prebiotic production of complementary RNA strands on rock surfaces.

Spontaneous mirror symmetry breaking: an entropy production survey of the racemate instability and the emergence of stable scalemic stationary states

2020 ◽  
Vol 22 (25) ◽  
pp. 14013-14025 ◽  
Author(s):  
Josep M. Ribó ◽  
David Hochberg
Keyword(s):  
Symmetry Breaking ◽  
Entropy Production ◽  
Mirror Symmetry ◽  
Flow System ◽  
Stationary States ◽  
Open Flow ◽  
Continuous Range ◽  
Non Equilibrium

Stability of non-equilibrium stationary states and spontaneous mirror symmetry breaking, provoked by the destabilization of the racemic thermodynamic branch, is studied for enantioselective autocatalysis in an open flow system, and for a continuous range n of autocatalytic orders.

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