update remaining models

12 files changed, 46 insertions, 6 deletions

diff --git a/examples/hodgkin_huxley/model.modelica b/examples/hodgkin_huxley_neron_potential/model.modelica
index 7e44547..7e44547 100644
--- a/examples/hodgkin_huxley/model.modelica
+++ b/examples/hodgkin_huxley_neron_potential/model.modelica
diff --git a/examples/hodgkin_huxley/page.md b/examples/hodgkin_huxley_neron_potential/page.md
index 4598c97..4598c97 100644
--- a/examples/hodgkin_huxley/page.md
+++ b/examples/hodgkin_huxley_neron_potential/page.md
diff --git a/examples/lotka_volterra/examples.toml b/examples/lotka_volterra_predator_prey/examples.toml
index 0f5fb85..0f5fb85 100644
--- a/examples/lotka_volterra/examples.toml
+++ b/examples/lotka_volterra_predator_prey/examples.toml
diff --git a/examples/lotka_volterra/model.modelica b/examples/lotka_volterra_predator_prey/model.modelica
index 706ebc3..706ebc3 100644
--- a/examples/lotka_volterra/model.modelica
+++ b/examples/lotka_volterra_predator_prey/model.modelica
diff --git a/examples/lotka_volterra/page.md b/examples/lotka_volterra_predator_prey/page.md
index 1ae891d..1ae891d 100644
--- a/examples/lotka_volterra/page.md
+++ b/examples/lotka_volterra_predator_prey/page.md
diff --git a/examples/van_der_pol/examples.toml b/examples/van_der_pol/examples.toml
deleted file mode 100644
index e69de29..0000000
--- a/examples/van_der_pol/examples.toml
+++ /dev/null
diff --git a/examples/van_der_pol/page.md b/examples/van_der_pol/page.md
deleted file mode 100644
index e69de29..0000000
--- a/examples/van_der_pol/page.md
+++ /dev/null
diff --git a/examples/van_der_pol/model.modelica b/examples/van_der_pol_oscillator/model.modelica
index c1aa99b..c1aa99b 100644
--- a/examples/van_der_pol/model.modelica
+++ b/examples/van_der_pol_oscillator/model.modelica
diff --git a/examples/van_der_pol_oscillator/page.md b/examples/van_der_pol_oscillator/page.md
new file mode 100644
index 0000000..ff24c7c
--- /dev/null
+++ b/examples/van_der_pol_oscillator/page.md
@@ -0,0 +1,22 @@
+
+The Van der Pol oscillator was originally proposed by the Dutch electrical
+engineer and physicist Balthasar van der Pol while he was working at
+Philips. Van der Pol found stable oscillations, which he subsequently
+called relaxation-oscillations and are now known as a type of limit cycle in
+electrical circuits employing vacuum tubes. When these circuits were driven
+near the limit cycle, they become entrained, i.e. the driving signal pulls the
+current along with it. Van der Pol and his colleague, van der Mark, reported in
+the September 1927 issue of Nature  that at certain drive frequencies an
+irregular noise was deterministic chaos.
+
+The Van der Pol equation has a long history of being used in both the physical
+and biological sciences. For instance, in biology, Fitzhugh and Nagumo
+extended the equation in a planar field as a model for action potentials of
+neurons. The equation has also been utilised in seismology to model the two
+plates in a geological fault, and in studies of phonation to model the right
+and left vocal fold oscillators.
+
+## References
+
+* Wikipedia:
+  [Van der Pol oscillator](https://en.wikipedia.org/wiki/Van_der_Pol_oscillator)
diff --git a/examples/von_bertalanffy/page.md b/examples/von_bertalanffy/page.md
deleted file mode 100644
index ea6e9f1..0000000
--- a/examples/von_bertalanffy/page.md
+++ /dev/null
@@ -1,5 +0,0 @@
-
-
-An alternative/solve variant is:
-
-    l = L * (1 - e^(-K * t))
diff --git a/examples/von_bertalanffy/model.modelica b/examples/von_bertalanffy_organism_growth/model.modelica
index 4eb45f6..afc6f7f 100644
--- a/examples/von_bertalanffy/model.modelica
+++ b/examples/von_bertalanffy_organism_growth/model.modelica
@@ -1,6 +1,7 @@
 model VonBertalanffyGrowth
+    "Rate-of-growth model for biological organisms"
     parameter Real K    "growth rate";
-    parameter Real L    "asymptotic final size";
+    parameter Real L    "asymptotic final length (L infinity)";
     Real l              "length";
 equation
     der(l) = K * (L - l);
diff --git a/examples/von_bertalanffy_organism_growth/page.md b/examples/von_bertalanffy_organism_growth/page.md
new file mode 100644
index 0000000..79a643f
--- /dev/null
+++ b/examples/von_bertalanffy_organism_growth/page.md
@@ -0,0 +1,22 @@
+
+The Bertalanffy equation is an equation that describes the rate of growth of a
+biological organism. The equation was offered by Ludwig von Bertalanffy in 1969.
+
+## Solution
+
+Integrating the equation gives:
+
+  $$ l = L \(1 - e^{-Kt}\) $$
+
+## References
+
+The body of this page comes from Wikipedia.
+
+* Wikipedia:
+  [Bertalanffy equation](https://en.wikipedia.org/wiki/Ludwig_von_Bertalanffy#Bertalanffy_equation)
+* [The von Bertalanffy growth equation](http://www.pisces-conservation.com/growthhelp/index.html?von_bertalanffy.htm)
+
+### Papers
+
+Bertalanffy, L. von, (1969). *General System Theory*. New York: George
+Braziller, pp. 136