Directory

The isee Directory is home to a variety of simulations published by our customers. You can search to see what is there by specifying by Title, Description, Keywords or Author. The default page lists a selection that may be of interest.

You can also log in to manage your own simulations or use Stella® Online to build models and CLDs.


We found 200 items

#1 - Lactase Enzyme Simulation with Data Analysis

by Jon Darkow - 677497 runs
Play

#2 - Photosynthesis Model

by Jon Darkow - 101690 runs
Play

#3 - Population dynamics of white footed mouse

by Jon Darkow - 71749 runs
Play

#4 - Evolution and Natural Selection

by Jon Darkow - 61455 runs
Play

#5 - Information Processing and Neurophysiology Model

by Jon Darkow - 36863 runs
Play

The main dependent variable measured in the model is the membrane potential (millivolts) of two different neurons in a series. You will be able to add excitatory and inhibitory neurotransmitters, and compare how these modulate electrical impulses of the two neurons. Additionally, you will be able to compare the effects of three neurotoxins: Tetrodotoxin, botulinum toxin, and sarin nerve gas. While extremely lethal, these toxins are very instructive in understanding neurons because of the specific way the toxins act. Each toxin modifies or inhibits a specific molecule in neurons that help process and transmit information.

#6 - Lactase with Variable Sample Sizes

by Jon Darkow - 37277 runs
Play

Arrayed Lactase Model

#7 - Cellular Respiration Accounting Model

by Jon Darkow - 19808 runs
Play

The purpose of the model is to understand how glucose is metabolized, and how the energy stored in its chemical bonds is transfered.

#8 - Lac Operon with Monod Bump

by Jon Darkow - 18027 runs
Play

#9 - Evolution of LAP Allele in Mussels

by Jon Darkow - 17446 runs
Play

#10 - Limiting Nutrients in Aquatic Ecosystems

by Jon Darkow - 14820 runs
Play

Experiment with a variety of nutrients that are limited by different degrees in four different ecosystems.

#11 - College Loans

by isee systems - 10384 runs - 174 downloads
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Each year, the cost of a college education continues to rise and more and more students must turn to student loans to complete their education. But as graduates leave college to embark on their careers, they face an almost Sisyphean struggle with student debt, forever facing an uphill battle while carrying a heavy burden, only to find they are getting nowhere! Whether you are graduating from college or just entering, we hope this model will enable you to better understand student loans and help plan for your future.

#12 - Water Potential and Osmosis

by Jon Darkow - 20862 runs
Play

Factors that affect the flow across a semi-permeable membrane.

#13 - Diffusion of a Spherical Cell

by Jon Darkow - 9210 runs
Play

Why are cells small? This model allows users to see how the size of a sphere affects the rate of diffusion.

#14 - Administration routes

by Ichie Hara - 10659 runs
Play

observe three type of plasma concentration curve, and combine three of them

#15 - Oral Absorption

by Sara Rosenbaum - 6668 runs - 43 downloads
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This model is based on first order absoprtion in a 1-compartment model

#16 - Zombie Apocalypse

by isee systems - 6083 runs - 25 downloads
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This is our first model in the From Imagination to Simulation series. It is a nod to the Halloween season and investigates a zombie apocalypse! Our fascination with zombies continually grows with the help of movies, TV shows, and books that give a wide range of zombie possibilities. But what are the dynamics behind a zombie epidemic? This model will specifically look at the spread of a zombie outbreak and examine some of the variables that help and hinder the rate of infection. We hope you will continue to see the benefits and versatility of Systems Thinking and enjoy our new series, From Imagination to Simulation! Continue to ponder those out-of-the-ordinary problems. They may seem unrealistic, but perhaps some of their dynamics may resonate with reality. Check out our zombie apocalypse model to see if there is any chance for human survival!

#17 - Recombination and Gene Linkage

by Jon Darkow - 14913 runs
Play

#18 - Pharmacokinetics: An IV Injection in a 1-Compartment Model

by Sara Rosenbaum - 4785 runs - 39 downloads
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#19 - Vacation

by isee systems - 4250 runs - 19 downloads
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Do you ever feel like work is taking over your life? Burnout is generally characterized as a state of mental and physical exhaustion resulting in low productivity and de-personalization and is most likely caused by prolonged stress that does not dissipate. There are many different aspects that affect both the building and dissipation of burnout. This model focuses on workloads and vacations to see how they contribute to both your level of burnout and productivity. Use this model to ask questions about your workload and any benefits you would receive from taking a vacation. What happens when you suddenly have a bigger workload? What happens when work piles up? Does vacation increase or decrease your stress levels?

#20 - Mulitple Bolus Injections Pharmacokinetics

by Sara Rosenbaum - 3543 runs - 17 downloads
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This model shows the typical plasma concentration profile associated with the administration of several doses of a drug over time. It demonstrates the determinants of the fluctuation in the plasma concentrations, the accumulation of the drug over the course of therapy and the resting steady state plasma concentrations.

#21 - Intravenous Infusion

by Sara Rosenbaum - 3546 runs - 16 downloads
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This model demonstrates the pharmacokinetic characteristics of constant continuous drug administration.

#22 - Photosynthesis with Variable Sample Sizes

by Jon Darkow - 3679 runs - 17 downloads
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Sample sizes of Photosynthesis stocks in an array

#23 - White-Eyed Genetics

by Jon Darkow - 8824 runs
Play

White-eyed is an allele that results in a fly white eyes. Wild-type variants have red eyes. The goal of this simulation is to determine the pattern of inheritance for the white-eyed phenotype. Is yellow body dominant or recessive? Sex-linked or autosomal? Complete, incomplete, or codominant?

#24 - Nonlinear Pharmacokinetics and Phenytoin

by Sara Rosenbaum - 2657 runs - 14 downloads
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Nonlinear or capacity limited pharmacokinetics can occur whenever a process involved in the absorption, distribution or elimination of a drug becomes saturated. This model demonstrates nonlinear elimination (metabolism) using phenytoin as the model drug. Specifically, it demonstrates how increasing doses of the drug produce disproportionate increases in the plasma concentration. It also demonstrates how the model parameters, Km and Vmax influence of the plasma concentration -time profile.

#25 - Apterous Genetics

by Jon Darkow - 33286 runs
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Apterous is an allele that results in a fly without wings. Wild-type variants have normally functioning wings. The goal of this simulation is to determine the pattern of inheritance for the apterous phenotype. Is apterous dominant or recessive? Sex-linked or autosomal? Complete, incomplete, or codominant?

#26 - Extinction Vortex

by Jon Darkow - 4681 runs
Play

#27 - Multiple Oral Doses Pharmacokinetics

by Sara Rosenbaum - 2607 runs - 14 downloads
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Most commonly people take oral doses of a drug over an extended period. This model demonstrates the unique plasma concentration profile associated with this type of drug administration. The model assumes first-order drug absorption with no lag time. Simulations can be carried out to observe how the rate and extent of absorption (bioavailability) affect the profile.

#28 - Transformation Simulation

by Jon Darkow - 5170 runs
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Simulation allows students to test the transformation principle. Two major goals of the experiment are: 1. Allow users to see that supernatant from heat-killed bacteria can transform the genes of another bacterium. 2. What transforms the inheritance of the bacteria is DNA, not RNA or proteins.

#29 - Change the dosing interval

by Ichie Hara - 2904 runs
Play

interval & dosing, regularly or irregularly

#30 - Pharmacokinetics: An IV Injection on a Two Compartment Model

by Sara Rosenbaum - 1933 runs - 20 downloads
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This model shows the profile of a drug after an intravenous injection when the drug displays two compartment characteristics

#31 - macrolab

by David Wheat - 2170 runs
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macrolab

#32 - Macromodel

by Pervin Dadashova - 3222 runs
Play

Model for the public policy testing

#33 - The Power of The Missing Middle

by isee systems - 1449 runs - 19 downloads
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Systems Thinking at Large takes a closer look at the suprising win for Trump. Focusing on the missing middle population and their possible power in the voting booth.

#34 - Closed Loop

by Christopher Quick - 15015 runs
Play

Mininimal closed-loop model of the cardiovascular system

#35 - Multiple Intermittent Infusions Pharmacokinetics

by Sara Rosenbaum - 1328 runs - 3 downloads
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The model shows the unique plasma concentration-time profile associated with the administration of a drug using multiple short infusions. It demonstrates the influence of the duration of the infusion and allows the user to practice the calculation of a suitable dose and dosing interval to achieve desired peak and trough plasma concentrations of a drug.

#36 - Steady State in Freshwater Ecosystems

by Jon Darkow - 12215 runs
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#37 - macrolab2017

by David Wheat - 4725 runs
Play

#38 - Limits to Growth Archetype

by John Hayward - 1157 runs - 92 downloads
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Shifting loop dominance in a limits-to-growth archetype is examined using the Hayward/Boswell Loop Impact Method.

#39 - Urban Business Expansion

by John Hayward - 1174 runs - 58 downloads
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The business sector of the Three Stock Urban Dynamics model is examined using the Hayward/Boswell Loop Impact Method.

#40 - Evolving Bits

by Jon Darkow - 1311 runs
Play

Diversity and selection for the basis of evolution. This simple model tries to illustrate these concepts.

#41 - Evolution with Heterozygous Advantage

by Jon Darkow - 1654 runs
Play

Evolution of Populations: Genetic Drift, Natural Selection, and Mutations

#42 - Sigmoidal Emax Model of Drug Response

by Sara Rosenbaum - 1054 runs - 37 downloads
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This is the model that is most commonly used to for the time course of drug effects in man. It assumes that the response is driven by the blood or plasma concentrations of the drug. When the model parameters are known, it can be used to predict response at anytime time after any dose.

#43 - Humanitarian Aid

by isee systems - 969 runs - 37 downloads
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A look at disaster relief under uncertain local government scenarios. It looks at how long it might take to establish clean water thru flying in bottled water and constructing wells. There is also the impact on spread of disease and survival due to lack of water. Created by Mark Heffernan and George McDonnel

#44 - Guns At School

by isee systems - 4536 runs
Play

This interface explores the public policy issue of gun violence at schools. As a policymaker, you can explore different initiatives to see which are most effective at reducing this violence.

#45 - Headcount Strategy

by isee systems - 801 runs - 80 downloads
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Explore a consulting firm’s headcount strategy. Understand the relationship between growth rates, promotion times, headcount pyramid ratios, and attrition rates. This model is based on actual work that was done with a very well-known consulting company (here, code-named TWBC, Inc.). The firm's strategic goals were well-articulated, and each made sense when written down in a list on a piece of paper. However, when subjected to the more rigorous, dynamic scrutiny that an iThink modeling effort provides, the goals (as is too often the case) turned out to be in conflict with one another--stimulating actions that worked at cross-purposes. Efforts to achieve one goal drove the firm farther away from achieving the others. The subsequent analysis conducted with the model also pointed the way toward resolving the internal strategic inconsistencies and putting the firm back onto a strategically sound growth path.

#46 - Growth Factors, Cyclins, and Cancer

by Jon Darkow - 21012 runs
Play

Explores the feedback loops that regulate the cell cycle. Model focuses on manipulating stimuli (growth factors), to stimulate the cell cycle feedback loops.

#47 - HPV and Adaptive Immune Response

by Jon Darkow - 3185 runs
Play

#48 - Campus sexual assault

by Peter Hovmand - 877 runs - 24 downloads
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A very simple, one stock, simulation of campus sexist attitudes toward rape and initimate partner violence. The model was originally developed in 1998 and later translated into Stella. The model has a number of modeling errors, but at the time, proved useful for gaining insight into the dynamics of the system and developing an innovative prevention program.

#49 - Housing Supply and Demand

by isee systems - 712 runs - 77 downloads
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Use this learning lab to investigate the housing crisis. Play with interest rates as if you are Chairman of the Federal Reserve and see the impact on housing supply and demand. What happens when banks relax mortgage requirements and more people qualify to buy homes?

#50 - Weight Loss Sim

by Corne - 1017 runs
Play

This simulation gives the user the ability to specify their own current condition (weight, age, height etc.), choose their exercise regime and eating plans. The simulator then gives a projection for the user's weight for the next year (at a weekly resolution). Please take note that most of the pictures are navigation buttons to different screens, so remember to click on the pictures. I have personally used this simulator to successfully lose more than 20 kg. Hope you find this as valuable as I did. Good luck with your weight journey!

#51 - Kent CC Cohort Test

by Whole Systems Partnership - 1273 runs
Play

Kent CC Test Cohort Model - Jan 18 v 1.4.2

#52 - The Laundry Detergent Game

by Billy Schoenberg - 714 runs - 45 downloads
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Congratulations! You've just been hired by the major grocery chain The Price Shopper as head of marketing. Your job is to turn around The Price Shopper's dismal sales of laundry detergent. The big-wigs have given you 12 months and a marketing budget of up to $10,000 per month to spend as you please. They'll decide to keep you, or send you to the cleaners based on how much profit you bring in over the year. Do you think you can make the big MONEY?

#53 - Pulmonary Edema

by Christopher Quick - 5872 runs
Play

This model predicts collection of fluid in the lungs.

#54 - Tragedy of the commons

by Billy Schoenberg - 13 runs
Play

#55 - Tryptophan Operon: A repressible system

by Jon Darkow - 8050 runs
Play

#56 - Supply and demand model

by Yaroslav Vorobiov - 541 runs - 146 downloads
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Supply and demand model

#57 - Stella Architect B.M. Sample

by Armando Izquierdo - 444 runs - 51 downloads
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Este modelo es un primer intento de utilizar el "Business Canvas" desarrollado por Alexander Osterwalder e Yves Pigneur, para explicar su carácter sistémico mediante la simulación de un modelo de negocio genérico utilizando Stella Architect. El objetivo principal es mostrar el vínculo entre los conceptos del pensamiento sistémico y la práctica del "Systems Dynamics" con el ampliamente difundido "Business Canvas". En la narrativa utilizada para describir la construcción del diagrama "Stock & Flow", se denomina entre parentesis el tipo de componente (Stock, Flow, Converter, o Conector) correspondiente a los principales elementos del modelo de negocio. La simulación permite visualizar la naturaleza sistémica de un modelo de negocio representado mediante el "Business Canvas".

#58 - Irreversible Drug Effects - Proton Pump Inhibitors

by Sara Rosenbaum - 466 runs - 1 download
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Some drugs act by binding covalently to their receptors. As a result, the target is destroyed and its function returns only when it has been replaced by newly synthesized product. The target may be a protein, DNA, an enzyme, or a cell at any stage of development. This model has been applied to the action of the proton pump inhibitors, which bind to and destroy the H+,K+-ATPase pumps in the parietal cells of the gastric mucosa. Normal proton secretion is restored only when the pumps are replaced by newly synthesized functioning pumps (i.e., the usual turnover time of the system).

#59 - Circadian Clock in the Mouse

by Jon Darkow - 2605 runs
Play

Transcriptional Translational Feedback Loop in the Mouse

#60 - Tick Tock: The Biological Clock and Circadian Rhythm

by Jon Darkow - 741 runs
Play

Explore gene expression of the transcriptional-translational feedback loop (TTFL) of the mouse circadian rhythm.

#62 - Indirect Effect Model 1

by Sara Rosenbaum - 435 runs - 6 downloads
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Some drugs do not directly produce the measured drug response. Instead they act upstream, and either increase or decrease the amount of the entity that directly mediates the response (response variable). Indirect effect Model I can be used for drugs that inhibit the synthesis of the response variable. An example is warfarin which inhibits the synthesis of clotting factors.

#63 - Amalgamated Industries

by isee systems - 740 runs - 9 downloads
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#64 - Turchin’s Metaethnic Frontier Theory of Imperial Growth

by John Hayward - 268 runs - 43 downloads
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A country builds its empire by attacking its neighbours and taking over both their land and their people. The larger the empire becomes, the more resources they have available to take further territory by force. However the further they expand, the harder they find it to keep expanding due to the geographical and organisational logistics involved. Additionally the empire finds it harder to maintain social cooperation among its people, its asabiya.

#65 - Aquatic Trophic Productivity Model

by Ryan Bellmore - 739 runs
Play

The ATP model is a dynamic food web simulation model.

#66 - Extended Agrarian Society (from Dynamic Systems)

by Paul Fisher - 294 downloads
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This model is an extension of the Simple Agrarian Society model from Dynamic Systems. The extensions are to add a CO2 cost to the industrialization, an impact of CO2 on global temperature, an impact of global temperature on drought frequency, and impact of drought on food production and an impact of global temperature on polar sea ice.

#67 - Bathtub

by Anne Gallagher - 537 downloads
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Introducing modeling through the bathtub model

#68 - interface-tutorial-start

by documentation - 629 downloads
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Starting model for interface building tutorial.

#69 - Overshoot and Collapse For ISAT 420

by Rod MacDonald - 550 runs - 13 downloads
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Simple Overshoot and Collapse Model

#70 - Dynaville

by Valerie Gacogne - 744 runs
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Dynaville simule l'évolution des habitants d'un territoire à un horizon de 10 ans (ménages, déplacements...), selon différents scénarios de logements, d'emplois et d'évolution de son attractivité.

#71 - Pattern with recessive single band

by Jon Darkow - 10274 runs
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#72 - Inventory Workforce Model

by John Hayward - 286 runs - 106 downloads
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Oscillations in an Inventory Workforce model are examined using the Hayward/Boswell Loop Impact Method.

#73 - Choosing the Future

by Peter Victor - 474 runs
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Users can run 3 long term scenarios for the Canadian economy featured in Managing without Growth (2nd edition) and create their own

#74 - Abastecimento de Água

by Mariana Lago - 454 downloads
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Demanda de água gera novos investimentos em infraestrutura de abastecimento

#75 - Model 21. Emax Model of Drug Response With an Effect Compartment

by Sara Rosenbaum - 372 runs - 9 downloads
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This model demonstrates how an effect compartment can be added to a pharmacokinetic model to accommodate a delay in drug response caused by a slow distribution of a drug to its site of action. The simulation also explains hysteresis

#76 - mse-litsim

by Lorenzo Andrade - 779 runs
Play

Modelo de Simulación de Escenarios MSE-LITSIM

#77 - Phenology of the Karner Blue Butterfly

by Jon Darkow - 1605 runs
Play

Karner Blue butterfly is an endangered species. Habitat loss and climate change are contributing factors to the reduction in the butterflies' population sizes. Climate change can alter the timing of lifecycles. When climate change disproportionally affects the timing of life cycles of species in an ecosystem asynchrony within a food web occurs.

#78 - Automation

by isee systems - 213 runs - 24 downloads
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Innovation often raises concerns about job losses, increasingly so in the past century with widespread automation and advanced artificial intelligence. Should we start to fear for our job security or will the creative potential in society maintain the labor force? Explore this model to see some of the interesting possibilities!

#79 - Collins Theory of Geopolitics - Effect of War

by John Hayward - 304 runs - 27 downloads
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The spread of an empire according to the theory of Randall Collins and equations of Peter Turchin

#80 - Dairy Cows

by isee systems - 189 downloads
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Agriculture offers many modeling opportunities. In this Systems in Focus, we look at the life cycle of a dairy herd, including milk production. This model could be used as the basis for methane production control, trade agreements about milk and how that impacts herd size, increasing production with demand, etc. Visit https://iseesystems.com/resources/systems-in-focus/agriculture/ for more information.

#81 - Transit Compartment of Drug Action

by Sara Rosenbaum - 274 runs - 13 downloads
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Change image Submit your own comment on the simulation. Share Comment upgrade hosting plan delete simulation Transit Compartment Model of Drug Response By Sara Rosenbaum Sim URL: https://forio.com/simulate/sarar/transit-compartment-model Sim access:Other authors can download source model Sim plan: Simulate Free Sim stats:This sim has been run 326 times. This simulation was uploaded to Forio Simulate with the isee NetSim software. More information can be found at iseesystems.com. Your Rating: 1 star2 star3 star4 star5 star Average Rating: rating(1) Click here to edit the description A delay in response to a drug can occur when it takes a long time for the drug’s initial effect to be translated into the final response (a long transduction process). The delayed response profile can be captured using a series of transit compartments.

#82 - Tolerance-Nicotine- Hypothetical Antagonist

by Sara Rosenbaum - 342 runs - 3 downloads
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Tolerance may be defined as a process that results in a reduction in the response to a specific drug concentration following repeated drug exposure. One model for tolerance assumes that the drug produces a hypothetical metabolite that opposes its action.

#83 - my new model

by Creative Learning Exchange - 325 downloads
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This model was copied from Emily Brzozowski: Educational outcomes in relation to resource allocation

#84 - Tolerance- Precursor Pool Model

by Sara Rosenbaum - 260 runs - 4 downloads
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Tolerance may be defined as a process that results in a reduction in the response to a specific drug concentration following repeated drug exposure. Tolerance could occur if an endogenous compound that plays an essential role in the response chain becomes depleted during response. This model assumes the drug stimulates the production of a response variable which becomes then becomes depleted.

#85 - Evolving Bits N=40

by Jon Darkow - 747 runs
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#86 - Energy Demand Lab

by isee systems - 150 runs - 53 downloads
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This simple model explores the demand dynamics for a state's energy usage. For three sectors (residential, industrial, and agricultural) you can adjust the size of initial user base, the growth rate for the number of users, and the rate for the change in demand per user.

#87 - Dodds Stella Modeling

by Henry Dodds - 262 downloads
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a SICK model, YEET!

#88 - Indirect Effect Model 2

by Sara Rosenbaum - 225 runs - 2 downloads
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Some drugs do not directly produce the measured drug response. Instead they act upstream, and either increase or decrease the amount of the entity that directly mediates the response (response variable). Indirect effect Model 2 can be used for drugs that inhibit the degradation of the response variable. As a result they increase the amount of the response variable.

#89 - Indirect Effect Model 4

by Sara Rosenbaum - 169 runs - 4 downloads
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Some drugs do not directly produce the measured drug response. Instead they act upstream, and either increase or decrease the amount of the entity that directly mediates the response (response variable). Indirect effect Model IV can be used for drugs that stimulate the degradation of the response variable. As a result they decrease the amount of the response variable.

#90 - Model 27. Hematological Toxicity of Anticancer Drugs

by Sara Rosenbaum - 196 runs - 8 downloads
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This model shows the typical effect of several anticancer drugs on the number of circulating neutrophils. The drugs destroy neutrophils as they develop in the bone marrow, and its takes several days for their action to affect the circulating neutrophils. The model demonstrates how inter-individual variability in pharmacokinetics and pharmacodynamics can effect the magnitude and duration of this response.

#91 - Business Cycle Dynamics

by isee systems - 182 runs - 23 downloads
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Business cycles are a fact of life for many industries. Market demand peaks one year only to plummet a year or two later. In this case study of a semiconductor business, Henk Akkermans, Professor of Supply Network Dynamics at Tilburg University, explores different policy options for order handling, production planning and capacity management to reduce oscillation and improve system performance.

#92 - Tesing Unknown Enzymes

by Jon Darkow - 2617 runs
Play

#93 - Salmon Simulator

by James Pratt - 528 runs
Play

Simulation of salmon populations with harvesting using the Tucannon River (WA) as an example. Simulation accompanies the text Modeling the Environment, 2nd ed. by Andrew Ford. Used with permission.

#94 - Bricks to Clicks

by isee systems - 153 runs - 32 downloads
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Experience the dynamics of making a business shift from traditional to e-commerce. Simulate different scenarios for how you’ll allocate spending on marketing versus infrastructure. You will see one of the more common dynamics in making a business shift, what Systems Thinkers refer to as the "worse before better" dynamic. If initial investments are made in the infrastructure quality rather than in marketing, total customers will actually fall for awhile. But if increasing amounts are spent on marketing (once the infrastructure is in place) then total customers will begin to explode. And the transition becomes successful!

#95 - Limited Enthusiasm Model of Church Growth

by John Hayward - 194 runs - 22 downloads
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A model of the growth of the Christian Church in periods of religious revival. The growth mechanism is similar to the spread of an infectious disease.

#96 - Le budget de la ville de Quimper

by Valerie Gacogne - 703 runs
Play

#97 - Model 20. DDI Drug-Drug Interactions - Pharmacodynamic

by Sara Rosenbaum - 281 downloads
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This model demonstrates the interaction between two agonists and allows the efficacy (Emax) of one to be varied

#98 - Test LSystem

by Bernt Saxin - 561 runs
Play

Testmodell

#99 - Feebates

by James Pratt - 538 runs
Play

Model of fees and rebates for air pollution control based on differing vehicle types. Model orginally developed by Andrew Ford to accompany Modeling the Environment, 2nd Ed., Island Press (2010) . Used with permission.

#100 - MM1-2_Growing

by Creative Learning Exchange - 389 downloads
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Model Mysteries Chapter 1: Growing, Growing, Gone Model 2: Zombie Chickens

#101 - Simulator private

by Camilo Benitez - 1412 runs
Play

#102 - Educational Outcomes

by Emily Brzozowski - 247 downloads
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Educational outcomes in relation to resource allocation

#103 - Diagrama causal innovacion

by Randiel - 199 downloads
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diagrama para representar el ciclo de innovacion

#104 - Mammoth Game

by Johanna Lockhart - 210 downloads
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Extinction of Mammoths

#105 - Process with Complete Quality Control Feedback Mechanisms

by Anthony Dowidowicz - 15 downloads
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This model depicts a process with exogenous inflows where the efficacy of the process descreases in proportion to time spent in the process. It is followed by a quality control mechanism with sensitivities and specificities which also decrease with time spent in the quality process. This bounded process and quality control is then checked against a gold standard which then adjusts as necessary in alignment with larger policy goals and feeds a larger data set. This model represents a realistic vision of what frontline quality control mechanisms should exist in the healthcare delivery system. It can be used as a tool for policy making to determine what acceptable rates of efficacy and outcome can be tolerated as quality based payments grow in popularity.

#106 - MM-1-1_Growing_linear

by Creative Learning Exchange - 375 downloads
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Model Mysteries Chapter 1: Growing, Growing, Gone Model 1: Zombie Chickens

#107 - SDGs Interactions, v2

by Dave Zelinka - 98 runs - 12 downloads
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This is the second version of the simulation that analyzes the interactions among the six Sustainable Development Goals (SDGs) that are the focus of the Second Annual Multi-stakeholder Forum on Science, Technology, and Innovation for the Sustainable Development Goals (STI Forum). The interface can be used to understand the trade-off due to the complex interplay among the set of six SDGs

#108 - Mammoth

by victor melendez - 204 downloads
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feedback loop

m a m m o t h

#109 - Dynamic Modelling of Lionfish Invasion in the Caribbean Sea and Atlantic Ocean

by Gian Wieck - 244 runs
Play

The dynamic model shall explain the rapid diffusion of the lionfish - an invasive species - throughout the Caribbean Sea and the Atlantic Ocean. The interface contains two explanatory models - a simple diffusion model and more realistic convection model - as well as a policy game to manage the regional countermeasures of local decision makers.

#110 - Indirect Effect Model 3

by Sara Rosenbaum - 115 runs - 7 downloads
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Some drugs do not directly produce the measured drug response. Instead they act upstream, and either increase or decrease the amount of the entity that directly mediates the response (response variable). Indirect effect Model III can be used for drugs that stimulate the production of the response variable. As a result they increase the amount of the response variable.

#111 - Wolves and Trees

by isee systems - 13 runs - 32 downloads
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Keystone species are defined as a plant or animal that plays a unique role in the way the ecosystem functions. But what would happen if that species were removed? What ripple effects would be caused by the absence of this species? We can examine these questions by looking at the wolf population in Yellowstone National Park. Wolves once flourished in Yellowstone and its surrounding areas. However, soon after the area was settled, misperceptions caused by fear and hatred fueled a large extermination effort of the wolves. For nearly 70 years, wolves were absent from Yellowstone. During this time, the ecosystem changed and diminished until scientists realized the value of the wolves and reintroduced them to Yellowstone. This model, built in iThink, uses storytelling to understand the dynamics of this keystone species. What animals were affected by their presence or absence. See how wolves play a part in not only population control of their prey but other animals and even plants far down the trophic levels.

#112 - qq

by kateK - 245 downloads
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This model was copied from Anne Wong: To investigate how rate of evaporation of water is affected by different factors

#113 - Airport Runway Capacity

by isee systems - 142 runs - 62 downloads
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Examine the implications of an increasing number of landing airplanes on a fixed capacity runway.

#114 - The Leaky Bucket

by Larissa M. Ramos - 204 downloads
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Suppose we have a bucket sitting under a tap with water flowing into it at a constant rate. The bucket has a hole in the bottom, so water leaks out over time. The rate at which water flows out of the hole won't be constant because the water pressure at the bottom depends on the height of the water in the bucket. Therefore, if the bucket is nearly empty, only a trickle will escape, but if the bucket is full, the extra weight of the water will push the water out of the hole much faster. Also, if the hole is bigger, the water will flow out much faster. For this model, we're going to assume that the outflow rate is proportional to the volume of water in the bucket multiplied by the size of the whole: Out_flow = Volume_In_bucket * Size_of_hole

#115 - Trial

by Kirsten Gail Miaga - 193 downloads
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#116 - Emergency Room

by Billy Schoenberg - 275 runs
Play

This simulation shows the basic dynamics of a hospital emergency room. Patients arrive, are treated and leave. You are able to control the average arrivial rate and average treatment time. This simulation was made using the 3rd party developer API embedded within Stella Architect.

#117 - Integrated Population System

by Paul Fisher
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This model is a second extension of the Simple Agrarian model from Dynamic Systems that modifies the simple agrarian society model to include drought, industry produced CO2 and ice sheet dynamics. Primarily this is published as a test of porting form Stella 10.1 and learning how the new Stella Online operates. At some point a user interface and story will be added and the starting conditions calibrated to approximate treating Earth as an industrialized, agrarian society.

#118 - ab

by kateK - 239 downloads
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This model was copied from Anne Wong: To investigate how rate of evaporation of water is affected by different factors

#119 - Product Development Simulator

by Billy Schoenberg - 653 runs
Play

The Bass Model or Bass Diffusion Model was developed by Frank Bass and it consists of a simple differential equation that describes the process of how new products get adopted in a population. The model presents a rationale of how current adopters and potential adopters of a new product interact.

#120 - The Leaky Bucket

by Jen Loveland-Rose - 194 downloads
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Suppose we have a bucket sitting under a tap, with water flowing into it at a constant rate. The bucket has a hole in the bottom, so water leaks out over time. The rate at which water flows out of the hole will not be constant because the water pressure at the bottom depends on the height of the water in the bucket. Therefore if the bucket is full, the extra weight of the water will push the water out of the hole faster. Also if the hole is bigger the water will flow faster. For this model, we're going to assume that the outflow rate is proportional to the volume of the water in the bucket multiplied by the size of the hole.

#121 - Multiple Retailer Supply Chain

by isee systems - 72 runs - 57 downloads
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Experience the dynamics of overshooting/undershooting inventory typical in the retail industry. Tour this supply chain model to understand the structure from the factory through multiple retailers to the consumer.

#122 - Population

by Billy Schoenberg - 225 downloads
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Sample population model with graph

#123 - Supply Chain-Collection Center of Tomato

by ernesto lagarda - 150 downloads
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The model was developed in a company of the Agri-food sector and considers the distribution link in the collection center of the Tomato Roma product for export to Rio Rico AZ, in 2017 by students of the Technological Institute of Sonora of the Department of Industrial Engineering.

#124 - BacterialGrowth

by Daniel Edward McMahon - 190 downloads
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Yo listen up, here's the story About a little guy that lives in a blue world And all day and all night and everything he sees is just blue Like him, inside and outside Blue his house with a blue little window And a blue Corvette And everything is blue for him And himself and everybody around 'Cause he ain't got nobody to listen I'm blue da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa I'm blue da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa I have a blue house with a blue window Blue is the color of all that I wear Blue are the streets and all the trees are too I have a girlfriend and she is so blue Blue are the people here that walk around Blue like my Corvette, it's in and outside Blue are the words I say and what I think Blue are the feelings that live inside me I'm blue da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa I'm blue da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa I have a blue house with a blue window Blue is the color of all that I wear Blue are the streets and all the trees are too I have a girlfriend and she is so blue Blue are the people here that walk around Blue like my Corvette, it's in and outside Blue are the words I say and what I think Blue are the feelings that live inside me I'm blue da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa I'm blue da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa Da ba dee da ba daa, da ba dee da ba daa, da ba dee da ba daa

#125 - The Dynastic Cycle

by John Hayward - 203 runs - 13 downloads
Download Model Play

The model of Feichtinger, Forst and Piccardi.

#126 - ING DE LA INFORMACIÓN EMPRESARIAL

by Daniela - 264 downloads
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diagrama forrester de un parque industrial

#127 - Energy (2002)

by isee systems - 5 runs - 45 downloads
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Can Energy Prices Really Be Passed on to the Consumer? Energy literally fuels every aspect of today's economy. When energy costs increase, many businesses will increase prices thereby "passing on" the cost to consumers. This story helps to explain some of the broader reaching impacts of such a policy. This model was created by Steve Peterson.

#128 - Business Model Stella Canvas

by Armando Izquierdo - 122 runs - 28 downloads
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A sample of how Stella Architect can be used to simulate and create an interface using as reference the Business Model Canvas developed by Osterwalder & Pigneur

#129 - mans not hot

by clemente - 224 downloads
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man not hot

#130 - Stella project

by Julianne Bantayan - 246 downloads
View

Simulation showing how cyber attacks have grown in various years.

#131 - MNH Strategic Model

by Peter Hovmand - 723 runs
Play

Strategic model of country-level policies to reduce maternal and neonatal mortality.

#132 - Velocidad Un Ferrari

by Patricio javier Mackay - 236 downloads
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Velocidad Un Ferrari se detiene en una luz roja. La luz se vuelve verde. El conductor pisa el acelerador y el carro sale acelerado. Él deja el pie en el acelerador. El carro acelera a 5 millas por hora cada segundo. Pregunta: ¿Qué tan rápido ira el Ferrari 16 segundos después?

#133 - SAVi mockup

by Andrea Bassi - 526 runs
Play

#134 - Introduction to Systems Dynamic Modeling

by Will - 307 downloads
View

Packet provided after interview

#135 - DaisyWorld

by James Pratt - 402 runs
Play

Game model of Daisyworld. Model orginally developed by Andrew Ford to accompany Modeling the Environment, 2nd Ed., Island Press (2010) . Used with permission.

#136 - Factors affecting the rate of evaporation of water

by Anne Wong - 226 downloads
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To investigate how rate of evaporation of water is affected by different factors

#137 - Demographic Fiscal Model of State

by John Hayward - 25 runs - 19 downloads
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An agrarian population can exceed its normal carrying capacity by the formation of a state that helps improve land productivity. As the population and state grow, it becomes harder for state revenue to stay ahead of expenditure. Eventually the state runs out of money and collapses, with a large drop in population numbers.

#138 - STELLA water model

by Armelita - 208 downloads
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#139 - Predator-Prey-LevelA

by Creative Learning Exchange - 42 runs - 2 downloads
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Level A: Up and Down in the Wild: Predator and Prey This lesson allows students to explore the interactions of two animal populations (wolves and moose) within an ecosystem. One animal in the simulation is a predator. The other animal is its prey. Their populations rise and fall (oscillate) over time as they interact and impact one another.

#140 - Spread of Disease

by John Hayward - 117 runs - 50 downloads
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A simple SIR model is examined using the Hayward/Boswell Loop Impact Method.

#141 - The Bass Diffusion Model

by Akshit Shah - 194 downloads
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it is a model for the adoption of a new technology, Given P as the potential adopters of the new technology, and A as the actual adopters, the adoption of new technology takes place due to two process - 1) word of mouth and 2) advertising and any other external influence. the adoption rate AR from potential adopters is AR= WoM + AfA

#142 - Carbon Cycle Model

by Henry Dodds - 248 downloads
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Model of Carbon Cycle

#143 - Housing Interventions to Improve Child Welfare Outcomes

by Social System Design Lab - 246 runs - 4 downloads
Download Model Play

#144 - SanteDentaire

by Valerie Gacogne - 1074 runs
Play

#145 - Shane Goodwin - Carbon Levels

by Shane Goodwin - 124 downloads
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I'm doing this because I want to. Not because Deke told me to.

#146 - Customer-Employee Satisfaction

by isee systems - 103 runs - 37 downloads
Download Model Play

Research shows a strong correlation between employee satisfaction and customer satisfaction. Understand the correlation through this model, which illustrates the causal relationship between the two.

#147 - Service Call Center Dynamics

by isee systems - 25 runs - 13 downloads
Download Model Play

One organization in the service delivery business experienced a situation where the number of delivery requests increased dramatically due to a seasonal promotion. This increase in requests caused an overload on the service delivery staff by not only having more people requesting service, but also because the amount of time spent with each customer increased. This model is designed to describe why this occurred in a way that can be transferable to other service delivery organizations.

#148 - MM2-1_Energy

by Creative Learning Exchange - 303 downloads
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Model Mysteries Chapter 2: Energy Drink Mania Model 1: Basic Model

#149 - ResiMod v.2.5

by Jai Clifford-Holmes - 467 runs
Play

ResiMod was developed by the Association for Water and Rural Development (AWARD), a South African non-profit organisation, with partners. The underlying work was funded by the United States Agency for International Development, under a USAID Southern Africa grant – RFA-674-12-000016 RESilience in the LIMpopo Basin Program (RESILIM). The RESILIM-O part of the programme is implemented by AWARD, in association with project partners.

#150 - Leg VS Asprin

by Abbey McDonald - 122 downloads
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#151 - Crop Selection Dynamics

by Saeed Langarudi - 130 runs
Play

This model replicates dynamics of crop selection in an agricultural system in which there are two groups of farmers: upstream and downstream. Upstream farmers have immediate access to surface water but downstream farmers can use surface water that is remaining after upstream use. Both groups of farmers grow two types of crops. Crop characteristics as well as other assumptions of the model could be changed by model users. Different scenarios for water availability are also available to the users.

#152 - Grit-Affect-Performance

by Raafat - 52 downloads
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A first attempt at conceptualizing the dynamic relationship between emotions and grit and their influence on student performance in cyberlearning environments

#153 - Dosing regimen for renal failure

by Ichie Hara - 3551 runs
Play

compare plasma concentration in renal failure, plan the dosing regimen in renal failure

#154 - Collins Theory of Geopolitics - Logistical Load

by John Hayward - 60 runs - 22 downloads
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The spread of an empire according to the theory of Randall Collins and equations of Peter Turchin. Includes limits to growth due the distance beween the empire's expansion zone and centre.

#155 - Supply Chain: Logistic Service Gas Station

by ernesto lagarda - 127 downloads
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This model was developed by Ernesto Vega and Ernesto Lagarda in 2017 for a Company AGM in Sonora Mexico

#156 - Global Energy Balance and the Greenhouse Effect

by Ashley McCloud - 128 downloads
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The flows of light energy toward and away from the Earth. Energy comes in from sunlight, but some of its reflected back away from Earth, depending on the planet's albedo. The rest is absorbed by the Earth's surface and stored there. The Earth's surface gives infrared blackbody radiation according to the Stefan-Boltzmann law. A balance is reached when the inflowing solar energy exactly equals the outflowing infrared energy.

#157 - Consumo de agua

by esteban - 132 downloads
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Este modelo es sobre cuanto nos demoramos en la ducha y cuanto estamos gastando por dia.

#158 - Romeo and Juliet-LevelB

by Creative Learning Exchange - 49 runs - 12 downloads
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Students use a simple simulation to explore "what if" questions relating to characters. They can change how characters behave to consider whether a story might have emerged differently. Note that students do not need to read the play, The Tragedy of Romeo and Juliet in order to explore the simulation.

#159 - General Practice Advanced skill simulator

by Whole Systems Partnership - 290 runs
Play

A model to explore changing roles within the advanced skilled workforce for General Practice in the UK.

#160 - NatGas staged modeling guidance

by Michael L Deaton - 288 runs
Play

Adaptation and simplification of Naill's original Fossil2; for intro sys. dyn. course at JMU's Integrated Science and Technology Program

#161 - leidy Montaño

by Leidy Natalia - 106 downloads
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estructuras de edades

m a t h i a s

#162 - Modelo TOC

by Gabriela Silva Vizguerra - 162 downloads
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Simulación de un modelo para aumentar la capacidad de un proceso mediante la explotación de una restricción.

#163 - multiplayer-tutorial-start

by documentation - 297 downloads
Download Model

This is the starting point for the help chapter on building a multiplayer game

#164 - Lav kraftforpris

by Culti Visus - 158 downloads
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lav kraftforpris

#165 - Medical Resident VS Patients

by Abbey McDonald - 131 downloads
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Who will win? The not yet doctor, or the street duo who needs medicine but in a controlled fashion? Who will go home in this TITLE FIGHT? Who will stay in the hospital

#166 - Health Policy Management Flight Simulator

by Shamim - 1663 runs
Play

This is a basic health policy simulator that allows the user a policy lever on where to prioritise health care spending.

#167 - Wetland Forestland hydrology

by Sam Probert - 108 downloads
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Simulates multiple hydrological processes through a forestland and wetland on the Western Boreal Plain, Canada

#168 - Logistic Growth Model and the Butterfly Effect

by Jon Darkow - 662 runs
Play

Model allows users to test the starting population size (N), the carrying capacity of the population (K), and the intrinsic rate of growth (r max). Iterations are discrete, not continuous.

#169 - MM5-D3_Disappeared

by Creative Learning Exchange - 287 downloads
View

Model Mysteries Chapter 5: The Disappeared Dare 3

#170 - Marketing and Customer Segmentation

by Billy Schoenberg - 57 runs
Play

In this game you play the part of Dunkin Donuts in an established market of 1,000,000 coffee drinkers. This market is controlled only by Dunkin Donuts and Starbucks, there is no other competition. The market is segmented into 4 sub-groups: Heavy Regular, Heavy Espresso Base, Occasional Regular Occasional Espresso Base. The occasional coffee drinkers normally order a pastry (donut, cake, etc.) with their coffee more often than the the heavy coffee drinkers, but on an individual by individual basis the heavy coffee drinkers are buying more donuts each month than the occasional coffee drinkers. For this game you are concerned with selling 3 products: Regular Coffee, Espresso Base Coffee, Pastry (donuts, cakes, etc.) For each product you sell you have control over the following decisions: Process Improvement Spending, Taste Improvement Spending, Marketing, Price. Finally you can then also choose to open new stores or close existing stores.

#171 - Rocket Model

by Christopher DiCarlo - 194 downloads
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Rocket Model with Wind Resistance

#172 - Salmon Hypoxia Modeling Lab

by Ryan Bellmore - 347 runs
Play

This model simulates the influence of spawning salmon on dissolved oxygen in southeast Alaskan Rivers.

#173 - Human Ecological Systems (HES)

by Peter Hovmand - 127 runs
Play

The purpose of this model is to (1) demonstrate a way to represent human development that includes individual resources, social networks, and spatial relationships within a single model of a formal feedback theory of development, (2) provide an approach to theory development that begins with a simple model and gradually includes more complex facets of social reality (e.g., social networks, location), and (3) illustrate its application to formally testing and comparing a theory over a wider range of assumptions that can inform the design of data collection and analysis to more accurately reflect the dynamics of human development and outcomes. The approach has a wide range of possible applications in theory development and community intervention design, research, and evaluation. Examples include school-based and community based positive youth development interventions, drug use/addiction and treatment in rural settings, community responses to domestic violence, neighborhood effects and interventions, homelessness, supports for ex-offenders released from prison or jail, and health inequities. Version 1.0 focuses on mainly working out a simple example of interactions between social networks and spatial relationships. The model (right) represents a formal theory of how people will move to be close to their nearest friend. Since friends are determined by a social network where people have different sets of friends, and people are in different locations, movement will depend on an interaction between each individual’s social network, the location of their friends, the distance to their friends, and identifying their nearest friend and comparing one’s present location to the location of one’s nearest friend. The model implements this with a random social network for 100 individuals randomly distributed in 100m by 100m coordinate space.

#174 - MM4-1_Spreading

by Creative Learning Exchange - 275 downloads
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Model Mysteries Chapter 4: Spreading Like Crazy Base model

#175 - MM2-S3_Medicine

by Creative Learning Exchange - 272 downloads
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Model Mysteries Chapter 2: Energy Drink Mania Story 2: Medicine

#176 - MM1-D1_Growing

by Creative Learning Exchange - 262 downloads
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Model Mysteries Chapter 1: Growing, Growing, Gone Model 3: Zombie Chickens Dare

#177 - SR interaction of slbo and trbl

by srrz63 - 10 downloads
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Model of the interaction between Slbo and Trbl. C/EBP encoded by Slbo binds Trbl and is subsequently tagged by uiquitination. This interaction also changes the function of the pseudokinase domain of Trbl. In result, Trbl becomes susceptible to small molecule binding and is degraded.

#178 - Predator-prey-LevelB

by Creative Learning Exchange - 6 runs - 6 downloads
Download Model Play

Level B: Wild Things: Interacting Populations This lesson allows students to explore the interactions of two animal populations (predator and prey) within an ecosystem. Their populations can rise and fall (oscillate) over time as they interact and impact one another.

#179 - Gone with the Wind

by John Hayward - 37 runs - 8 downloads
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The loop impact method of Hayward/Boswell is applied to a single second order balancing loop using the narrative of the love relationship between Rhett and Scarlet from Gone with the Wind.

#180 - MM4-D3_Spreading

by Creative Learning Exchange - 269 downloads
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Model Mysteries Chapter 4: Spreading Like Crazy Dare 3

#181 - Rio Grande

by Aziz - 63 downloads
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Water resources availability in Rio Grande river basin, Western Bahia

#182 - MM2-S2_Sheep

by Creative Learning Exchange - 264 downloads
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Model Mysteries Chapter 2: Energy Drink Mania Story 2: Sheep

#183 - MM3-D3_Mind_the_Gap

by Creative Learning Exchange - 271 downloads
View

Model Mysteries Chapter 3: Mind the Gap Dare 3

#184 - Terrestrial Carbon Cycle

by Ashley McCloud - 94 downloads
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The model is suppose to help, learn and investigate the flow of carbon between the atmosphere and land plants and soils through photosynthesis and respiration. The key questions we want to understand are: ● How does the plant fertilization feedback work? ● Are plants taking up a significant amount of the carbon humans are emitting? ● Can we solve the climate change problem by planting trees to take up our CO​2​?

#185 - MM7-1_Fixit_Hatfields

by Creative Learning Exchange - 267 downloads
View

Model Mysteries Chapter 7: Fix it Fun Base Model

#186 - Sustainable Zero Waste Tyre Life Cycle

by Aldrich - 46 runs
Play

About 5 million tyres are disposed of every year in New Zealand and 70 per cent end up in a landfill. These tyres occupy a considerable amount of space. Often unaccounted for after disposal, tyre dumps eventually attract rats and other contaminants which may disrupt nearby environmental ecosystems in a way such as soil pollution. The standard is such that there is a difficulty with regards to recycling tyres due to the lack of an efficient system, tools, mechanics or even a commercial product that makes use of used tyres. As a result, tyres are quickly forgotten after disposed. This is an important problem in New Zealand with disastrous longer term environmental effects if not dealt with in the next few years.

#187 - aquarium nitrogen

by Mark Kamakea - 122 downloads
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nitrogen in solution in an aquarium

#188 - Agent Based SD

by Billy Schoenberg - 121 runs
Play

With this model I model the physical locations of all individuals in real space. (X,Y location). Individuals move randomly each day so that they mix. Based on an individuals location relative to each other individuals there is a chance for a person to communicate the infection to another person. To determine if the infection is communicated we draw a random number. If the number is equal to or less then the chance of infection if the other person is the carrier then the person P contracts the infection and can then spread it through the population. What is superior about this model is that we can now EASILY model the attributes of any individuals as a stock arrayed by Individuals and the interaction of people with others as arrayed variables by Individual, Individual. For instance if we wanted to model the time that an individual has had a disease we can do that by creating a stock called time_infected and have an inflow of 1 for each day that an individual is in the infected state.

#189 - Ocean Acidification

by Chris - 178 downloads
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Ocean Acidification

#190 - mm7-2_Fixit_Hatfields_fixed

by Creative Learning Exchange - 258 downloads
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Model Mysteries Chapter 7: Fix it Fun Hatfields - Fixed

#191 - EarthEnergy

by Jill Marie Derwin - 136 downloads
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#192 - PINOcho el mentirososo

by Patricio javier Mackay - 131 downloads
View

Pinocho Cuando Pinocho miente su nariz se alarga 1 centímetro. Y cada vez que pinocho hace una obra buena se le disminuye 5 centímetros. Cada día pinocho miente unas 8 veces y hace una obra buena. Pregunta: Si el lunes en la mañana la nariz de pinocho mide 4cm. ¿Qué tan larga será el sábado en la noche?

#193 - Dairy value chain development in Nicaragua

by Helene Lie - 211 runs - 1 download
Play

Dairy farmers in Matiguás, Nicaragua face feed system constraints that reduce their competitiveness. Conventional value chain analysis methods are unsuited to prioritize upgrading options. System dynamics modeling of the Matiguás dairy value chain was therefore used to quantify and analyse policy impacts. The model was constructed and tested with stakeholders in the Matiguás dairy value chain through group model building.

#194 - University Students Enrollment Growth Model

by Raafat - 25 runs
Play

In response to financial issues, the administration at an undergraduate tuition-dependent university pushed for growth in student enrollment. The faculty, who argued that the quality of education had been declining, resisted the expansion. More students also affected the use of the university’s infrastructure. By actively engaging key stakeholders, we developed a simple system dynamics model of university expansion.

#195 - Testroar

by Roar Kristiansen - 122 downloads
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Dette er en test

#196 - SellPhone solo v2

by Martin Schaffernicht - 1 run
Play

The Sim is part of the book "Growth Dynamics in New Markets". You are the country manager of the mbile phone company NewPhone and try to diffuse mobile telephony in the country Plutonia. Your competitor is RivTel, and they have the same goal. During 123 months, each of the managers can ser the values of five decision variables and try to acheive the highest possible accumulated profits. (https://onlinelibrary.wiley.com/doi/book/10.1002/9781119118305). This version is for playing alone, RivTel is played by the model (v2)

#197 - Simple Global Carbon Cycle Model

by GLOBE Program - 128 runs
Play

The Global Carbon Cycle Model is a 5-box model, which includes five of the major carbon pools (atmosphere, plants, oceans, soils, and fossil fuels), and the fluxes between them. Use the Global Carbon Cycle Model to explore how carbon moves throughout the Earth system, how different pools and fluxes interact, and the impacts of human actions on the carbon cycle. Learn more at www.globe.gov (the GLOBE Program).

#198 - Neurophysiology and Neurotoxicity

by Jon Darkow - 6966 runs
Play

The main dependent variable measured in the model is the membrane potential (millivolts) of a motor neuron and the muscle fiber it innervates. You will be able to add excitatory and inhibitory neurotransmitters, and compare how neurotransmitters modulate the electrical impulses of the motor neuron and the muscle fiber. Additionally, you will be able to compare the effects of four neurotoxins: Tetrodotoxin, botulinum toxin, sarin nerve gas, and VX. While extremely lethal, these toxins are very instructive in understanding neurons because of the specific way the toxins act. Each toxin modifies or inhibits a specific molecule in neurons that help process and transmit information.

#199 - Global Carbon Cycle Model with Feedbacks

by GLOBE Program - 50 runs
Play

The Global Carbon Cycle Model with Feedbacks builds on the Simple Global Carbon Cycle Model by including ecosystem feedbacks as well as new parameters such as CO2 and temperature effects, more carbon pools, and marine biota. Use this model to explore how carbon moves through the Earth system, how the pools and fluxes interact, and how human actions can impact the carbon cycle. Learn more at www.globe.gov (The GLOBE Program) Use this model to explore how carbon moves through the Earth system, how the pools and fluxes interact, and how human actions can impact the carbon cycle. Learn more at www.globe.gov (The GLOBE Program)

#200 - SellPhone duo

by Martin Schaffernicht - 1 run
Play

The Sim is part of the book "Growth Dynamics in New Markets". You are the country manager of the mbile phone company NewPhone and try to diffuse mobile telephony in the country Plutonia. Your competitor is RivTel, and they have the same goal. During 123 months, each of the managers can ser the values of five decision variables and try to acheive the highest possible accumulated profits. (https://onlinelibrary.wiley.com/doi/book/10.1002/9781119118305). This version is for playing as a team of 2, The first player starts a "game" and the second player logs into the game.