System Analysis at Universität Trier

Flashcards and summaries for System Analysis at the Universität Trier

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What is DT and what is it depending on ? 

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Definition Mass Balance Concept

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What are model builders 
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Steps of model validation 

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What is a state variable ? 

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what are the  5 main behavioural  pattern of environmental systems ? 

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Steps in building a model 
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What are implications of nonlinearities in models ? 

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Rules of building a model 

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Definition dynamic equilibrium 

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Exploratory analysis 
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What is a system function ?

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Exemplary flashcards for System Analysis at the Universität Trier on StudySmarter:

System Analysis

What is DT and what is it depending on ? 
DT = Delta Time
It is the time interval between calculations in your model simulation and it determined based on following information =

  • The nature, processes and objectives of the model 
  • The available data for the model
  • The time boundaries of the model

System Analysis

Definition Mass Balance Concept
The total mass of any system remains constant under all transformations 

System Analysis

What are model builders 
  • Flows
  • Stocks 
  • Convertors

System Analysis

Steps of model validation 
  • Observe real world system to develop understanding 
  • Check structural validity and predictive validity 
  • Time series analysis, scatterplots or regression analysis 

System Analysis

What is a state variable ? 
Concentrations (in a common currency) that depend on space and time 

System Analysis

what are the  5 main behavioural  pattern of environmental systems ? 
  • Logistic growth 
  • Linear growth 
  • Exponential growth 
  • Overshoot and collaps 
  • Oscillation 

System Analysis

Steps in building a model 
  • Identify the scientific problem 
  • Determine the relevant variables and processes 
  • Develop mathematical formulation 
  • Numerical implementation 

System Analysis

What are implications of nonlinearities in models ? 
Oscillatory behaviours
Nonlinear behaviour dramatically affects an ecosystem 

System Analysis

Rules of building a model 
  • keep system diagrams as simple as possible 
  • Relationships  between elements must be mathematically defined 
  • Observe conservation law and maintain consistency in units 
  • Reservoir values only changed by inflow and outflow

  • System diagrams show relationship in a system
  • System model quantify relationships in a system and allow system to be explored experimentally

System Analysis

Definition dynamic equilibrium 
System processes moves in opposing directions at equivalent rates, balancing their effects 

System Analysis

Exploratory analysis 
  • Role of particular system elements in the overall model behaviour 
  • Which model elements have big impact on overall model and which have limited impact
  • What are the synergistic effects
  • How does model react to disturbance 
  • Which changes in parameters cause the model to run out of control ? 






System Analysis

What is a system function ?
A time dependent process linking two elements or the aggregate effect of multiple processes  and interactions 

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