Effective Critical Exponents of Ising Strips D*L with D<<L

Monte Carlo data simulating phase transitions in Ising strips $D\times L,$ ($D\llL)$ with periodic boundary conditions show that $T_{c}(D)=0$ for $D\leq D^{\ast}\simeq 6$ and $0<T_{c}(D)<T_{c}(d=2)$ for $D>D^{\ast}.$ Regular scaling of $ML^{\beta /\nu}$ vs $|T-T_{c}|L^{1/\nu}$ is obtained only for $$and the Monte Carlo effective susceptibility critical exponent $\gamma_{eff} (D)$ is shown to be well described by $\gamma (d)=\beta (d)[\delta (d)-1]$ with $$ given by $d_{eff}(D)\simeq 1.5+({1/200})(D-6)$ and \beta (d)=(\frac{3d%}{16}-{1/4}), $\delta ^{-1}(d)=(\frac{2d}{15}-{1/5})$, which can be understood as valid with $d_{eff}(D)$.