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function Dx=myfun3(x,t)
m0= 6.8307e-007;
Pv=2.548;
Pc=958.31;
Uc=281.75*10^(-6);
P0=101418;
H0=0.08;
Kc=5.36*10^(-5);
hfg=2260;
lamdac=679.0981810^(-3);
Tc=373;
B=3826.36;
C=-45.47;
g=9.81;

Dx(1)=(1/(m0+2*pi*Pc*x(3)^3/3))*(-m0*g+4*pi*Pc*x(3)^3*g/3-0.544*pi*Pc*lamdac*(x(2)-Tc)*((x(1)^3)*(x(3)^3)/(2*Kc))^(1/2)/(hfg*Pv)-4*pi*Uc*x(3)*x(1));
Dx(2)=-Pc*g*x(1)*(x(2)+C)^2/((P0+Pc*g*(H0-x(4)))*B);
Dx(3)=0.272*lamdac*(x(1)/2*Kc*x(3))^(1/2)*(x(2)-Tc)/(hfg*Pv);
Dx(4)=x(1);
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