Het computersimulatieproject 1985 - 2005

microworlds - microwerelden - learning objects

(products / applets / applications)

(Engelstalige zowel als Nederlandstalige versies van simulatie applicaties)

Thes applications are mostly developed with JavaTHESIS, some with HyperTHESIS or SuperTHESIS and some with the MacTHESIS system. Some programs are built with WebLib; but most with SimLib. One program is developed with the old RLCS-system.


AORTA is a model about arteriosclerosis. Medical students can familiarize themselves with some basic concepts from hemodynamics and some aspects of arteriosclerosis. In using this microworld an answer is given to questions like 'What happens if the total peripheral resistance of the circulation is increased?' The opposite can also be an educational goal, namely the question as to what is the cause of the deviating picture of the diastolic pressure in the aorta. 'Can the cause of a decreased diastolic pressure in the aorta be a decreased compliance of the aorta? Yes or no?' Students learn to handle notions like compliance and total peripheral resistance and changes there in.

Screndump of AORTA, MacTHESIS zw/wit versie.


Screendump Aorta, version JavaTHESIS.


Screendump, Web-versie Arts, Expert system, Min & Oosterloo, java pilot-project, R. Min (applet).


AXON is a model about the action potential (the 'voltage' or 'output') in a nerve, in relation to a stimulus (the 'input'). In 1952 Hodgkin and Huxley published a quantitative model of the electrical and electrochemical phenomena in the environment of the membrane of a nerve fiber based on their theory. The original model of Hodgkin and Huxley was not a mathematical model but an electric circuit consisting of capacitors and resistors. however, it is very simple to transfer this model into a mathematical model. Although some of the aspects of the conductivity of the cell membrane were not described correctly by Hodgkin and Huxley, their model is still very useful for the education of medical students and biology students as it can be used as a simplified version of the correct model thus helping the students to build a conceptual 'framework' model which can be filled with the complete and correct conceptual model in a later phase of their education. It can also be used as a demonstration for the experimental research techniques used in cell physiology (Oorsprong: Hodgkin & Huckly, Univ. of Limburg & R. Min).

Screendump Axon, Biology.


Screendump BEEN, animatieversie Rik Min. Orthop., Therap., Control regulation, P. Veltink, Univ. Twente, Bio Medical Engineering, in samenwerking met het Roesink, M. Drent, M. Gielians, E. Spoelma and R. Min.


BOILER is a model that is able to simulate the working of a solar boiler installation consisting of a collector, a storage vessel, a heat exchanger with a pump which runs through the collector and storage vessel and a possibility for tapping. The simulation enables students to become familiar with the characteristics of a solar boiler and to gain insight into the influences of different interventions in the model around the installation. A lot of interventions are possible. For example, students can change the intensity of the sun-rays, the heat capacity of the collector, the reflexion of the collector, the primary pump, the outside temperature and the load of the boiler vessel (model: Wessels & Tung).

Screendump, BOILER, web-version 1, in combination with the real, conceptual model and other stuff all together in a complex, higher order e-learning environment


Screendump web-version a + instruction.


Screendump web-version b + instruction.


CARDIO is a model to study the control mechanisms of human bloodpressures. The model simulatates the blood pressure regulation under normal and abnormal conditions. The model allows the simulation of pathological conditions, such as myocardial infarct, renal artery stenosis or renal insufficiency. Therapeutic interventions in abnormal conditions can also be simulated. The program allows the application of drugs like cardiac glycosides, diuretics or vasodilator. It is original a model developed by T. Coleman. This microworld enables students to experiment with the basic principles of blood pressure regulation for a healthy young man. The program simulates an experimental laboratory where hemodynamic research can be done, variables can be registered, and where interventions in the model can be made without real-life complications. With this model the student can do a series of experiments, such as the simulation of heart failure, hypertension, renal failure, exceptional blood loss, selective venous constriction, and selective arterial constriction. (Coleman, Uni. of Mississippi, Univ. of Limburg & R. Min).

Screendump CARDIO, version 5.0x.


Screendump, Web-version Maurice 1.0x, blood pressure regulation.


Screendump, Web-version Maurice 2.0x, blood pressure regulation (2000).


CASCADE is a model about 3 or 5 tanks with water: a water cascade. Between the tanks are some taps. The model simulates the levels in the tanks.

Screendump CASCADE, about the flow of water in tanks. Demonstration program, R. Min.


CONTROL is one of the series of models about the control theory. All the versions are feedback systems: 1st order, 2nd order, with and/or without a PID regulator.

Screendump 2004


Screendump DIFFUSION, 1996.

ECONOMY, training version

ECONOMY is a model about This program is based on a complex small open economy model (the Netherlands) of Miltenburg. It is a product of Enschede UT in cooporation with the Rotterdam University (EUR) and the University of Moskou. The program covers: The Dutch economy and in particular macro-economics. The relations are described in the form of discrete mathematical formula. An aptitude for mathematics and abstract thinking is a prerequisite for understanding the relationships. A simulations of this economic system can be used in a game-like context. The interaction with these game-like simulations can have two positive effects on the students: an increased motivation to learn and the gain of (almost) concrete experience, which is hard to gain in any other way.

Screendump ECONOMIE, a small and open economy (the Netherlands). Model: Miltenburg. Versie Erasmus University Rotterdam, University of Moskow & University of Twente (R. Min) (1999).


Screendump ECONOMIE, WebLib vesie 2002.


Screendump ECONOMIE, versie 2003. (broken link)

ENZYME, WebLib version

ENZYME is een model over enzym kinetiek en chemische reacties. (Enzym kinetics, simulatie met WebLib, Univ. of Limburg & R. Min).

Screendump ENZYME, WebLib versie, 2004


FRAMA is a model about farmacokinetics. Here: drugs and rats.

Screendump FARMA, Mac-versie, 1997


Screendump FARMA, Web-versie met casussen en parallelle instructie.


Screendump FEEDBACK, HyperTHESIS versie, Feedback demonstration program, R. Min.


FLUIDS is a model about fluids and other regulations in the human body. Het model is van Ikeda, Marumo, Shiritako & Sato, Univ. Kioto, Japan; de eerste simulatie versie is gemaakt door R. Min op de University of Limburg te Maastricht.

Screendump FLUIDS, Twentse versie van de water en zout huishouding in het menselijk lichaam. De model-driven simulatie is gebaseerd op het model van Ikeda, Marumo, Shiritako & Sato (1996)


Screendump FLOWSIM, Atari/GEM version, Flow in water; flow in rivers, Waterloopkundig laboratorium, Waterloopkundig laboratorium & W. J. Zwart.


Screendump GLUCOSE, Glucose & Insuline Regulation System, University of Leiden, v.d. Heide & Hoogers.


A model of the electiric activity in the heart and as output: the electrocardiogram ECG. Model: R. Min: the M-equations, Univ. of Delft.

Screendump HART, PDP11/03 (Minc) versie Universiteit van Limburg.


A model of economical activity; een model over de flow van de meerwaarde. Model: R. Min & K. Marx.

Screendump KAPITAAL, JavaTHESIS versie (2005).


LEMMINGEN (BIOLOGY) is a model aangaande diffusie processen (verdringings processen) in de natuur. Biology, Landbouw Universiteit Wageningen, Univ. Twente (P. van Schaick Zillesen).

Screendump LEMMINGEN, zw/wit versie.


Screendump LEMMINGEN, kleuren versie.


Screendump TOENDRA (LEMMINGEN), animatie-versie.


LEREN (LEARNING) is een denk-model over hoe kennis wordt geaccumuleerd c.q. leren geschied (R. Min).

Screendump LEREN (LEARNING), een denk-model over hoe kennis wordt geaccumuleerd c.q. leren geschied.


Screendump PASTEURISEREN, SuperTHESIS version (experimenteel), Agriculture, ODB/Kaas-project, S. van Duin, W.J. Zwart & R. Min.


Screendump PADEL ANIMAL, ICS version (experimenteel). ICS-project (R. Min, 1996).


Screendump PEKELZUIVERINGS INSTALLATIE. Chemistry, De Niet, Chemische Technologie, Univ. Twente, in samenwerking met AKZO, Hengelo & van Schaick Zillesen (UT) & R. Min.


Screendump PLC, a programmable logical controler. Control Technics; modelling, E. Moen, M. Wolters, v. Doorn & R. Min.


Screendump RANDSTAD, version 2, Randstad Holding NV, Diemen (Koopal, Gritter & Min).


RC NETWORKS or FILTERS is a model about the behaviour of an electric circuit only with resistors and capacitors. Microworlds like this are useful in training before starting real experiments. Students can change the input (sinus, block or pulse), the frequency and the amplitude of the input. Furthermore, the two properties of this electronic network: the resistor (R) and the capacitor (C).

Screendump RC NETWORKS or FILTERS, versie WebLib.


Screendump REGELSYSTEEM, HyperTHESIS system (1998).


Screendump SATSIM, VAX version, Satalite dynamics, control regulation, Fokker Space & Systems, Fokker Space & Systems, Ter Hedde, Univ. Twente.


Screendump SUCROS, Agriculture, ecology, biology, Landbouw Universiteit Wageningen, H. Gritter, A. Berloth & R. Min.


Screendump STREMMEN (COAGULATION), versie ODB-project. Video feedback-versie; 2e orde parallelisme. (Min, 1996)


TRANSISTOR is a model about the behaviour of a basic transistor circuit with 4 resistors in a normal signal amplifier circuit. Microworlds like this are useful in the physics or electronics curriculum as a training in direct current (DC) and alternating current (AC) before starting real experiments. Students can change the form of the input (sinus, block or pulse), the frequency and the amplitude of the input. Furthermore, the properties of the electronic network can be changed: resistors, capacitors, etc. (Model: Electrotechnology, van Leeuwen, faculty of Electrotechnology in samenwerking met R. Min; laaste versie van het model: R. Min.).

Screendump TRANSISTOR, animation version (experimenteel).


Screendump TRANSISTOR, HyperTHESIS version (experimenteel).


Screendump TRANSISTOR, web version (experimenteel) met video demonstratie.


VIJVER (FOOD CHAIN) is a model of the ecological processes of plants, minerals, water, carbon dioxide and oxygen. Green plants (producers) synthesize organic material during photosynthesis. Light is required in order to do this. Oxygen is produced during photosynthesis. For their food carps and silvercarps (consumers) depend on plants (directly or indirectly). Within an ecosystem, several (long and short) food-chains and food-webs may exist. The organic material is mineralized by bacteria and fungi (reducers). The microworlds can simulate five ponds. In each pond oxygen, nitrate, phosphate and detritus (a complex of organic material and fungi and bacteria) are present. Pond 1: Algae. Pond 2 Silvercarps. Pond 3: Zooplankton and Benthos. Pond 4: Carps. Pond 5: All together, Carps, Silvercarps, etc. (Biology, ecology, Svirezhev et al., Univ. of Moskow, van Schaick Zillesen & SLO).



Screendump VIJVER, web versie met parallelle coaching.


Screendump VIJVER, web versie met parallelle instructie en scratchpad.


Screendump WATERBAK, voorbeeld-versie van animatie met WebLib.


Screendump WATERBAK, SimLib simulatie versie. Demonstration programma voor e-Book.

Enschede, 1985-2003; updated 2005 and 2018.