Database Reference
In-Depth Information
INFLOWS:
MATURE D2
=
U1 D * NYMPHS D2
{
Individuals per Time Period
}
I R2
=
INFECTION 2
{
Individuals per Time Period
}
OUTFLOWS:
DEATHS DA2
=
ADULTS D2 * B2 D
{
Individuals per Time Period
}
ADULTS H1(t)
=
ADULTS H1(t
−
dt)
+
(MATURE H1
+
INCOMING 1
−
DEATHS HA1
IMMIG 1 TO 2) * dt
INIT ADULTS H1
−
=
.1
{
Initial healthy adults
}
INFLOWS:
MATURE H1
=
U1 H * NYMPHS H1 * (1
−
INFECTION COEF1)
{
Individuals per Time Period
}
INCOMING 1
=
ARRIVE 2 TO 1
{
Individuals per Time Period
}
OUTFLOWS:
DEATHS HA1
=
ADULTS H1*B2H
{
Individuals per Time Period
}
IMMIG 1 TO 2
=
IF ADULTS H1
−
(.1 * ADULTS H1
+
.9 *
FRXNL CAP1)
>
0 THEN (.1 * ADULTS H1
+
.9 * FRXNL CAP1) ELSE IF ADULTS H1
>
Individuals per Time Period; Only healthy
adults migrate. At least 10% of the healthy adults always migrate. Under the
noted conditions the 10% healthy and an additional fraction of the healthy adults
based empirically on the total number of adults also migrate. Note well the order
of the nested IF statement; the first one is checked first and if the condition holds,
the first statement is executed and the program goes no further. Otherwise all the
adults flee. This same statement is also true of the adults in the other field.
0 THEN ADULTS H1 ELSE 0
{
}
ADULTS H2(t)
=
ADULTS H2(t
−
dt)
+
(MATURE H2
+
INCOMING 2
−
DEATHS HA2
IMMIG 2 TO 1) * dt
INIT ADULTS H2
−
=
.1
{
Initial healthy adults
}
INFLOWS:
MATURE H2
=
U1 H * NYMPHS H2 * (1
−
INFECTION COEF2)
{
Individuals per Time Period
}
INCOMING 2
=
ARRIVE 1 TO 2
{
Individuals per Time Period
}
OUTFLOWS:
DEATHS HA2
=
ADULTS H2*B2H
{
Individuals per Time Period
}
IMMIG 2 TO 1
=
IF ADULTS H2
−
(.1 * ADULTS H2
+
.9 *
FRXNL CAP2)
>
0 THEN (.1 * ADULTS H2
+
.9 * FRXNL CAP2) ELSE IF ADULTS H2
>
0 THEN ADULTS H2 ELSE 0
{
Individuals per Time Period
}
CARRY R1(t)
=
CARRY R1(t
−
dt)
+
(R COUNT1
−
DUMP1) * dt
INIT CARRY R1
=
0
INFLOWS:
R COUNT1
=
IF MOD(time,52)
=
0 THEN RANDOM(0,1)/DT ELSE 0
OUTFLOWS:
DUMP1
=
IF MOD(time,52)
=
0 THEN CARRY R1/DT ELSE 0
{
Insures a
new number between 0-1 each integer time step.
}
