A Simple Model Giving the Annual Yield in Weight from a Fishery in a Steady State

1993 ◽  
pp. 35-38
Author(s):  
Raymond J. H. Beverton ◽  
Sidney J. Holt
Keyword(s):  
Steady State ◽  
Simple Model

Mathematical modelling of salt purification by recrystallization. Countercurrent arrangement

1986 ◽  
Vol 51 (11) ◽  
pp. 2481-2488
Author(s):  
Benitto Mayrhofer ◽  
Jana Mayrhoferová ◽  
Lubomír Neužil ◽  
Jaroslav Nývlt
Keyword(s):  
Steady State ◽  
Simple Model ◽  
Mathematical Modelling ◽  
Distribution Coefficient ◽  
Mother Liquor ◽  
Equilibrium Temperature ◽  
Operating Conditions ◽  
Limiting Case

The paper presents a simple model of recrystallization with countercurrent flows of the solution and the crystals being purified. The model assumes steady-state operating conditions, an equilibrium between the outlet streams of each stage, and the same equilibrium temperature and distribution coefficient for all stages. With these assumptions, the model provides the basis for analyzing the variation in the degree of purity as a function of the number of recrystallization stages. The analysis is facilitated by the use of a diagram constructed for the limiting case of perfect removal of the mother liquor from the crystals between the stages.

scholarly journals THE RICH AND THE POOR IN A SIMPLE MODEL OF GROWTH AND DISTRIBUTION

2016 ◽  
Vol 20 (7) ◽  
pp. 1934-1952 ◽  
Author(s):  
Kirill Borissov
Keyword(s):  
Economic Growth ◽  
Steady State ◽  
Simple Model ◽  
Disposable Income ◽  
State Equilibrium ◽  
Positional Concerns ◽  
The Poor ◽  
The Rich ◽  
Intertemporal Equilibrium ◽  
Unique Steady State

We consider a model of economic growth with altruistic agents who care about their consumption and the disposable income of their offspring. The agents' consumption and the offspring's disposable income are subject to positional concerns. We show that, if the measure of consumption-related positional concerns is sufficiently low and/or the measure of offspring-related positional concerns is sufficiently high, then there is a unique steady-state equilibrium, which is characterized by perfect income and wealth equality, and all intertemporal equilibira converge to it. Otherwise, in steady-state equilibria, the population splits into two classes, the rich and the poor; under this scenario, in any intertemporal equilibrium, all capital is eventually owned by the households that were the wealthiest from the outset and all other households become poor.

TWO TEMPERATURE DESCRIPTION OF RNA-LIKE POLYMER

2008 ◽  
Vol 22 (10) ◽  
pp. 785-790
Author(s):  
K. G. SARGSYAN
Keyword(s):  
Steady State ◽  
Simple Model ◽  
Simple System ◽  
Mean Square ◽  
End Distance ◽  
End To End ◽  
Polymer State ◽  
Two Temperature ◽  
Non Equilibrium

The two-temperature description of the RNA-like molecule is invented. Instead of equilibrium treatment of the polymer state, the steady state viewpoint is proposed. The molecule is considered as being in an adiabatic steady state, which is a non-equilibrium one. The general approach to the molecule in such a steady state is discussed and the simple model with saturating bonds is considered. The relation between mean square end-to-end distance and the number of monomers is derived for the simple system under condition T>Θ. The obtained relation depends on additional so-called disorder temperature.

Heat Transfer Enhancement in Ventilated Brake Disk Using Double Airfoil Vanes

2011 ◽  
Vol 3 (4) ◽  
Author(s):  
A. Nejat ◽  
M. Aslani ◽  
E. Mirzakhalili ◽  
R. Najian Asl
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Steady State ◽  
Simple Model ◽  
Transfer Enhancement ◽  
Brake Disk ◽  
Pumping Efficiency ◽  
Angular Velocities ◽  
The Heat Transfer Coefficient ◽  
Novel Design

The aim of this research is to enhance the heat transfer of ventilated brake disks using modified vanes. The investigated braking scenario is a hold braking deceleration during a downhill drive. A simple model for computing the steady state vane’s temperature is presented. The heat transfer coefficient (HTC) of the brake disk’s ventilation is estimated by means of a verified CFD computation. A novel design for the vanes is proposed using an airfoil profile to improve the air pumping efficiency increasing the flow velocity between vanes. For further improving the ventilating capacity, a secondary airfoil vane is introduced to the primary airfoil vane design. The computed results estimate 17% to 29% improvement in HTC number for new vane design at different disk’s angular velocities.

Extending the Theory of Creep to Viscoplasticity

1994 ◽  
Vol 116 (1) ◽  
pp. 67-75 ◽  
Author(s):  
A. D. Freed ◽  
K. P. Walker ◽  
M. J. Verrilli
Keyword(s):  
Steady State ◽  
Simple Model ◽  
Power Law ◽  
Copper Alloy ◽  
Theoretical Framework ◽  
Kinetics Equation ◽  
Creep Theory ◽  
Material Functions

A viscoplastic theory is developed that reduces to creep theory analytically under steady-state conditions. A fairly simple model is constructed from this theoretical framework by defining material functions that have close ties to the physics of inelasticity; consequently, the model is characterized easily. The computational characteristics of the model are enhanced, in general, by converting the kinetics equation from a hyperbolic relationship to a power-law relationship. The resulting model is applied to copper and to the copper alloy, NARloy Z.

scholarly journals Using FDFD Technique in Two-Dimensional TE Analysis for Modeling Clutter in Wall Penetrating Radar

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
David Insana ◽  
Carey M. Rappaport
Keyword(s):  
Fourier Transform ◽  
Steady State ◽  
Simple Model ◽  
Finite Difference ◽  
Two Dimensional ◽  
Electromagnetic Modeling ◽  
Field Interaction ◽  
State Frequency ◽  
Small Targets ◽  
2D Images

Finite difference frequency domain (FDFD) computational electromagnetic modeling is implemented to perform a two-dimensionalTEzanalysis for the application of wall penetrating radar (WPR). Resolving small targets of interest, embedded in a strong clutter environment of unknown configuration, is difficult. Field interaction between clutter elements will dominate the received fields back-scattered from the scene. Removing the effects of clutter ultimately relies on the accuracy of the model. Analysis starts with a simple model that continues to build based on the dominant scattering features of the scene. FDFD provides a steady state frequency response to a discrete excitation. Taking the fast Fourier transform of the wideband response of the scene, at several external transmit/receive locations, produces 2D images of the clutter, which are used to mature the model.

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