A non-linear state space approach to model groundwater fluctuations

2006 ◽  
Vol 29 (7) ◽  
pp. 959-973 ◽  
Author(s):  
W.L. Berendrecht ◽  
A.W. Heemink ◽  
F.C. van Geer ◽  
J.C. Gehrels
Keyword(s):  
State Space ◽  
State Space Approach ◽  
Non Linear ◽  
Groundwater Fluctuations ◽  
Linear State ◽  
Space Approach

Decadal changes in the productivity of New England fish populations

2019 ◽  
Vol 76 (9) ◽  
pp. 1528-1540 ◽  
Author(s):  
Adrien Tableau ◽  
Jeremy S. Collie ◽  
Richard J. Bell ◽  
Cóilín Minto
Keyword(s):  
New England ◽  
State Space ◽  
Environmental Changes ◽  
Reproductive Rate ◽  
Short Term ◽  
State Space Approach ◽  
Linear State ◽  
Northeast Us ◽  
Time Invariant ◽  
Space Approach

The Northwest Atlantic continental shelf is a large ecosystem undergoing rapid environmental changes, which are expected to modify the productivity of natural marine resources. Current management of most fished species assumes stationary production relationships or time-invariant recruitment rates. With linear state-space models, we examined the evidence of dynamic productivity for 25 stocks of the Northeast US shelf. We expanded the suite of options available within the state-space approach to produce robust estimates. Fifteen of the stocks exhibited time-varying productivity or changes in their maximum reproductive rate. Few productivity time series are related across the whole region, though adjacent stocks of the same species exhibited similar trends. Some links to region-wide environmental variables were observed. We demonstrate that fish recruitment can often be better predicted over a short-term horizon by accounting for dynamic productivity, which could be valuable for fisheries management. Improving predictions by incorporating environmental covariates or covariance among the stocks must be considered case by case and with caution, as their relationships may change over time.

GENERALIZED THEORY OF MAGNETO-THERMO-VISCOELASTIC SPHERICAL CAVITY PROBLEM UNDER FRACTIONAL ORDER DERIVATIVE: STATE SPACE APPROACH

2020 ◽  
Vol 9 (11) ◽  
pp. 9769-9780
Author(s):  
S.G. Khavale ◽  
K.R. Gaikwad
Keyword(s):  
State Space ◽  
Fractional Order ◽  
Order Derivative ◽  
Laplace Inversion ◽  
State Space Approach ◽  
Spherical Region ◽  
Fractional Order Derivative ◽  
Numerical Laplace Inversion ◽  
Mathcad Software ◽  
Space Approach

This paper is dealing the modified Ohm's law with the temperature gradient of generalized theory of magneto-thermo-viscoelastic for a thermally, isotropic and electrically infinite material with a spherical region using fractional order derivative. The general solution obtained from Laplace transform, numerical Laplace inversion and state space approach. The temperature, displacement and stresses are obtained and represented graphically with the help of Mathcad software.

scholarly journals A Bayesian State-Space Approach to Mapping Directional Brain Networks

2020 ◽  
pp. 1-24
Author(s):  
Huazhang Li ◽  
Yaotian Wang ◽  
Guofen Yan ◽  
Yinge Sun ◽  
Seiji Tanabe ◽  
...  
Keyword(s):  
State Space ◽  
Brain Networks ◽  
State Space Approach ◽  
Space Approach
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