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Equation:       
double k=0.69503887;   
double NB2=0.260727165;     
double x=1/(k*T);
double S13;  
double St;
double EST;
double SS;
double SSS;
double up;
double down;
up=0;   
down=0;
for (S13=abs(S1-S3);S13<=(S1+S3);S13=S13+1) {   
for (St=abs(S13-S2);St<=(S13+S2);St=St+1) {        
     EST=J1*St*(St+1)+(a-1)*J1*S13*(S13+1);   
     SS=2*St+1;
     SSS=St*(St+1)*(2*St+1);
     up=up+SSS*exp(EST*x);
     down=down+SS*exp(EST*x);
}
}  
double chi=NB2*g^2*up/(3*k*(T-Theta)*down);
double chid=1/chi-2.0*zJ/(NB2*g^2);      
ChimT=T*(1/chid+TIP);
Fitting result:               
Reduced Chi-Sqr        7.76916E-5               
Adj. R-Square        0.99935               
                Value        Standard Error
ChimT        S1        2.5        0
ChimT        S2        2.5        0
ChimT        S3        2.5        0
ChimT        a        0        0
ChimT        g        1.85659        2.47673E-4
ChimT        J1        -8.21926E-7        0.70726
ChimT        zJ        -0.02406        0.3141
ChimT        Theta        0        0
ChimT        TIP        -5.17729E-4        1.8158E-5
½«¹«Ê½ÒÔoriginCµÄÐÎʽÔÚorigin8.0Èí¼þÖн¨Á¢¹«Ê½£¬Ïà¹ØÄâºÏ²ÎÊýΪS1,S2,S3,a,g,J1,zJ,Theta, TIP. ´Ë¹«Ê½ÊÊÓÃÓÚ¸÷ÏòͬÐÔµÄÈýºË˳´ÅÀë×Ó´Å»¯ÂÊÄâºÏ¡£a=1´ú±íµÈ±ßÈý½ÇÐνṹ£¬a=0´ú±íÏßÐԽṹ£¬ÆäËû´ú±íµÈÑüÈý½ÇÐΡ£ÈκÎÈýºË£¨Í¬ºË¡¢ÒìºË£©µÄ¸÷ÏîͬÐÔ˳´ÅÀë×Ó¶¼ÊÊÓ᣹«Ê½ÊÇ¿ÆÑ§ÍøÒ»¸ßÈ˸ù¾Ývan-vleck׫дµÄ,ÊÜÒæ·Ëdz£¬ÒÔ´ËÀàÍÆ£¬Ë«ºË¡¢Ëĺ˽ԿÉÍÆµ¼¡£Ö»ÒªÄÜÍÆµ¼³öE(S)±í´ïʽ£¬Ò»Çж¼ºÃ°ì
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