scholarly journals Performance of a Bog Hydrological System Dynamics Simulation Model in an Ecological Restoration Context: Soomaa Case Study, Estonia

Water ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2217
Author(s):  
Oskars Java ◽  
Marko Kohv ◽  
Asko Lõhmus
Keyword(s):  
System Dynamics ◽  
Simulation Model ◽  
Ecological Restoration ◽  
Dynamics Simulation ◽  
Absolute Difference ◽  
Management Scenarios ◽  
Groundwater Levels ◽  
Hydrological System ◽  
Dynamics Models ◽  
Relative Comparisons

We describe how a bog hydrology simulation model, developed in the System Dynamics environment, predicts the changes in the groundwater levels that result from drainage ditch closure and partial thinning of the surrounding forest stand. Five plots were selected in an area that was subjected to such ecological restoration, and the observed groundwater levels were compared with the simulated ones. Across the plots, the mean difference between the observed and simulated groundwater curves varied between 0.88 and 2.63 cm, and the RMSE between 0.28 and 0.71. Although the absolute difference between the predicted vs. observed values was greater in the plots with ditch closure, the curves co-varied more closely there over time. Therefore, hydrological System Dynamics models can be particularly useful for relative comparisons and risk-mapping of novel management scenarios.

A system dynamics simulation model for water conflicts in the Zhanghe River Basin, China

2021 ◽  
pp. 1-17
Author(s):  
Liang Yuan ◽  
Weijun He ◽  
Dagmawi Mulugeta Degefu ◽  
Zhongchi Wan ◽  
Thomas Stephen Ramsey ◽  
...  
Keyword(s):  
System Dynamics ◽  
Simulation Model ◽  
River Basin ◽  
Dynamics Simulation ◽  
Water Conflicts ◽  
System Dynamics Simulation

With the Backlash Dynamics Simulation of a Crank-Slider Mechanism of the Internal Combustion Engine

2012 ◽  
Vol 215-216 ◽  
pp. 1081-1084
Author(s):  
Shao Jun Bo ◽  
Kui Ji ◽  
Juan Tian
Keyword(s):  
System Dynamics ◽  
Combustion Engine ◽  
Dynamics Simulation ◽  
Kinematic Pair ◽  
Body System ◽  
Nonlinear Characteristics ◽  
Preliminary Study ◽  
Multi Body ◽  
Dynamics Models ◽  
Crank Mechanism

On the basis of flexible multi-body system dynamics theory, we built flexible multi-body system dynamics models which include a backlash, and to a slider-crank mechanism as the research object, we made a preliminary study on the effect on the flexible components and the backlash of the kinematic pair on mechanical system dynamics characteristics. To consider the backlash of the kinematic pair and component of flexible space can show a preliminary research on the dynamic simulation, and focus on the backlash, friction and gravity field to influence in the dynamic characteristics of the system. The simulation results show that, due to the existence of backlash made the two components frequent collision in the process of the stretching, clearance, flexible and friction are closed, make the system nonlinear characteristics increased.

System dynamics simulation model for inventory optimisation of manufacturers: a case study in electrical industry

2019 ◽  
Vol 1 (1) ◽  
pp. 1
Author(s):  
Farimah Mokhatab Rafiei ◽  
Maryam Mofarrahi ◽  
Syed Ahmad Helmi ◽  
Masoud Rahiminezhad Galankashi
Keyword(s):  
System Dynamics ◽  
Simulation Model ◽  
Dynamics Simulation ◽  
Electrical Industry ◽  
System Dynamics Simulation

scholarly journals Contingencies of Violent Radicalization: The Terror Contagion Simulation

Systems ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 90
Author(s):  
Timothy Clancy ◽  
Bland Addison ◽  
Oleg Pavlov ◽  
Khalid Saeed
Keyword(s):  
System Dynamics ◽  
Simulation Model ◽  
Future Development ◽  
Policy Development ◽  
Dynamics Simulation ◽  
Mass Violence ◽  
Testing Environment ◽  
Root Cause ◽  
The Future ◽  
System Dynamics Simulation

This paper builds confidence in the terror contagion hypothesis that violent radicalization leading to predatory mass violence operates as a system. Within this system, the contingent values of key root causes create channels within which violent ideologies and terrorism emerge. We built a system dynamics simulation model capable of replicating historical reference modes and sophisticated enough to test the contingent values of these propositions. Of 16 propositions, we identified six root-cause propositions that must simultaneously exist, act in concert and explain the dynamics of their interaction which generate a terror contagion. Other propositions can strengthen or weaken an existing contagion but not eliminate it. We use an experiment to demonstrate how changing the contingent values of these propositions creates downward channels. This experiment helps reconcile the swarm vs. fishermen debate over the true root causes of violent radicalization. Within these channels, the contingent values can favor swarm or fishermen manifestations. The simulation and experimentation results enable the future development of the terror contagion hypothesis, provide a testing environment for research on violent radicalization, and provide a pathway to policy development in the combating of terrorism that arises from violent radicalization.

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