scholarly journals A dynamic reaction model of an inshore-offshore fishery with taxation as a control instrument

2014 ◽  
Vol 10 (4) ◽  
pp. 13-20
Author(s):  
Jayjayanti Ray ◽  
◽  
Tarun Pradhan
Keyword(s):  
Reaction Model ◽  
Dynamic Reaction ◽  
Control Instrument

CAPITAL THEORETIC ANALYSIS OF A HOLLING–TANNER-TYPE PREY–PREDATOR FISHERY WITH TAXATION AS A CONTROL INSTRUMENT

2009 ◽  
Vol 02 (02) ◽  
pp. 151-165
Author(s):  
TAPASI DAS ◽  
R. N. MUKHERJEE ◽  
K. S. CHAUDHURI
Keyword(s):  
Sensitivity Analysis ◽  
Global Stability ◽  
Reaction Model ◽  
Fishing Effort ◽  
Dynamic Interaction ◽  
Optimal Harvesting ◽  
Theoretic Analysis ◽  
Dynamic Reaction ◽  
Dynamic Variable ◽  
Control Instrument

The level of fishing effort expands or contracts in a dynamic reaction model of a fishery accordingly as the net economic revenue (i.e. perceived rent) to the fishermen is positive or negative. A dynamic reaction model reflects this dynamic interaction between the perceived rent and the effort in a fishery. The combined harvesting of a prey–predator fishery is assumed to be regulated by an external authority by imposing a tax per unit biomass of both the species. The fishing effort is taken to be a dynamic variable of time, which is proportional to the instantaneous capital invested in the fishery. The steady states of the system along with their local as well as global stability are considered. The optimal harvesting policy with the tax as a control instrument is discussed. The results are numerically discussed and graphically illustrated. Sensitivity analysis of the parameters is carried out. The paper ends with concluding remarks.

scholarly journals A Dynamic Model for Fishery Resource with Reserve Area and Taxation

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Hai-Feng Huo ◽  
Hui-Min Jiang ◽  
Xin-You Meng
Keyword(s):  
Fish Population ◽  
Reaction Model ◽  
Dynamic Reaction ◽  
Fishery Resource ◽  
Control Instrument ◽  
Optimal Harvest ◽  
Over Exploitation ◽  
Theoretical Results ◽  
Resource System ◽  
Optimal Harvest Policy

The present paper deals with a dynamic reaction model of a fishery. The dynamics of a fishery resource system in an aquatic environment consists of two zones: a free fishing zone and a reserve zone. To protect fish population from over exploitation, a control instrument tax is imposed. The existence of its steady states and their stability are studied. The optimal harvest policy is discussed next with the help of Pontryagin's maximum principle. Our theoretical results are confirmed by numerical simulation.

REGULATION OF A PREY-PREDATOR FISHERY BY TAXATION: A DYNAMIC REACTION MODEL

2003 ◽  
Vol 11 (02) ◽  
pp. 173-187 ◽  
Author(s):  
T. K. KAR ◽  
K. S. CHAUDHURI
Keyword(s):  
Dynamical System ◽  
Prey Species ◽  
Social Benefit ◽  
Reaction Model ◽  
Fishing Effort ◽  
Dynamic Interaction ◽  
Theoretic Approach ◽  
Dynamic Reaction ◽  
Growth Equations ◽  
Gross Rate

In a fully dynamic model of an open-access fishery, the level of fishery effort expands or contracts according as the net economic revenue (i.e., perceived rent) to the fisherman is positive or negative. A model reflecting this dynamic interaction between the perceived rent and the effort in a fishery, is called a dynamic reaction model. In this paper, we study a dynamic reaction model, in which the prey species is subjected to harvesting in the presence of a predator and a tax. It is also assumed that the gross rate of investment of capital in the fishery is proportional to the perceived rent. With this capital theoretic approach, the dynamical system consisting of the growth equations of the two species and also of the fishing effort is formulated. The steady state is determined and its stability is discussed. The object is to maximize the monetary social benefit as well as prevent the predator from extinction, keeping the ecological balance.

PENGARUH PIJAT STIMULASI OKSITOSIN TERHADAP INVOLUSI UTERUS PADA IBU MASA NIFAS DENGAN PERSALINAN NORMAL DI BIDAN PRAKTIK MANDIRI (BPM) WILAYAH KERJA PUSKESMAS TERISI KABUPATEN INDRAMAYU TAHUN 2016

2018 ◽  
Vol 5 (2) ◽  
pp. 1-12
Author(s):  
Intan Anggita
Keyword(s):  
Control Group ◽  
Chi Square ◽  
Control Group Design ◽  
Group Design ◽  
Control Instrument ◽  
Variable Control ◽  
Post Test

ABSTRAK Penelitian ini dilatar belakangi oleh meningkatnya angka kematian ibu nifas yang disebabkan oleh perdarahan salah satu cara untuk mengatasi perdarahan itu dengan cara melakukan pijat oksitosin pijatan ini dapat merangsang hormone oksitosin yang menyebabkan kontraksi uterus sehingga proses involusi berjalan normal. Tujuan penelitian ini untuk mengidentifikasi pengaruh pijat stimulasi oksitosin pada ibu nifas yang dipijat oksitosin dan yang tidak dipijat oksitosin. Penelitian ini merupakan penelitian Quasi eksperimen dengan metode post test only control group design. Sampel dalam penelitian ini diambil dengan cara consecutive sample.sampel berjumlah 45 orang yang terdiri dari 15 orang sebagai responden yang di intervensi dan 30 orang sebagai variable control. Instrument penelitian yang digunakan berupa lembar observasi untuk mengamati penurunan TFU di hari 1,2,3 dan 5 .Hasil dari penelitian ini ada pengaruh pijat stimulasi oksitosin terhadap involusi uterus pada ibu masa nifas di BPM wilayah kerja Puskesmas Terisi Kabupaten Indramayu Tahun 2016. Melalui uji statistic Chi-Square dengan nilai p

Intensification of cooling in a batch reactor with an exothermic reaction by nonisothermal control in stable pseudostationary states

1984 ◽  
Vol 49 (11) ◽  
pp. 2566-2578 ◽  
Author(s):  
Josef Horák ◽  
Petr Beránek ◽  
Dagmar Maršálková
Keyword(s):  
Batch Reactor ◽  
Exothermic Reaction ◽  
Reaction Model ◽  
Order Reaction ◽  
Zero Order ◽  
Coolant Temperature ◽  
Inlet Temperature ◽  
Adaptive Parameter ◽  
Zero Order Reaction ◽  
Set Up

An algorithm is set up and tested for the temperature control of a batch reactor consisting in jump changes in the inlet temperature of entering coolant. This temperature is so chosen that its difference from the temperature of the reaction mixture is near the highest difference at which the stable pseudostationary state of the system still exists. For the prediction of the new coolant inlet temperature, a zero-order reaction model is used with an adaptive parameter estimated from the experimentally established value of the maximum of the reaction mixture overheating at the previous coolant temperature.

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