function dT=RK(x,T)
alw=50;
Rw=0.3;
R1=0.3;
R2=1500;
c2=660;
la2=4;
la1=0.084;
al1=0.5;
al2=0.5;
et0=0.077;
R=8.314;
cp=1000;
T0=300;
E=126000;
Q=15130000;
k0=50000000000;
u=0.0001;
v=1;
u0=v/u;
Al0=(2*alw)/Rw;
a1=(R1*(u0+1)*cp+R2*c2*u0)/(al1*la1+al2*la2);
a2=Al0/(al1*la1+al2*la2);
a3=(R1*Q*et0*k0)/(al1*la1+al2*la2);
dT(1,1) = T(2); % первая производная dT/dx
dT(2,1)=u*a1*T(2) + a2*(T(1)-T0) - (a3/T(1))*exp(-E/R/T(1));
end