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Xm=Ng^2NB^2/3kT*1/2*3/2*(1+u1+u2+u1*u2)/(1-u1*u2
);
u1=coth(j1/kT)-kT/j1;
u2=coth(j2/kT)-kT/j2;

reference: Roberto CorteÂs,²,³  Marc Drillon,¡ì  Xavier Solans,¡Í  Luis Lezama,²  and TeoÂfilo Rojo*, Inorganic Chemistry, Vol. 36, No. 4, 1997   681
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coth(x)=cosh(x)/sinh(x)
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y=temp/(1-7.6853*temp*P5/P1/P1)
temp=0.09375*P1*P1*(1+exp(2.882*(P2-P3)/x)+10*exp(4.323*P2/x))/(1+exp(2.882*(P2-P3)/x)+2*exp(4.323*P2/x))*(1+temp1)/(1-temp1)/x
temp1=cosh(1.441*P4*0.75*(1+exp(2.882*(P2-P3)/x)+10*exp(4.323*P2/x))/(1+exp(2.882*(P2-P3)/x)+2*exp(4.323*P2/x))/x)/sin(1.441*P4*0.75*(1+exp(2.882*(P2-P3)/x)+10*exp(4.323*P2/x))/(1+exp(2.882*(P2-P3)/x)+2*exp(4.323*P2/x))/x)-1/(1.441*P4*0.75*(1+exp(2.882*(P2-P3)/x)+10*exp(4.323*P2/x))/(1+exp(2.882*(P2-P3)/x)+2*exp(4.323*P2/x))/x)
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y=(x/(x-th)*0.125*g^2*6*exp(2*1.441*j1/x)/(1+3*exp(2*1.441*j1/x))*(1+(cosh(j2*1.441/x)/sinh(j2*1.441/x)-x/j2/1.441
))/(1-(cosh(j2*1.441/x)/sinh(j2*1.441/x)-x/j2/1.441
))+x*tip)/(1-a*(x/(x-th)*0.125*g^2*6*exp(2*1.441*j1/x)/(1+3*exp(2*1.441*j1/x))*(1+(cosh(j2*1.441/x)/sinh(j2*1.441/x)-x/j2/1.441
))/(1-(cosh(j2*1.441/x)/sinh(j2*1.441/x)-x/j2/1.441
))+x*tip)/x/(g^2*3/8/1.441))
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7Â¥2010-12-15 17:32:36
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