Notice of RetractionEvaluation on the Stability of Rock Mass Deformation Based on Chaotic Muation -RPNN Model
To analysis the stability of rock mass long-term developing deformation,the chaotic muation -RPNN model is built. Combining the chaos theory,the muation theory is introduced, and the stability of rock mass deformation is evaluated by chaotic muation -RPNN model. The lost measured displacement data are interpolated by using the higher order polynomial methos, and the long-term displacement is forecasted,and the stability of rock mass long-term developing deformation is analyzed. Research shows that the strend of predicted displacement is approximately the same as that of measuring displacement,and there is no suddenly dropped or sudden increased phenomena,and the displacement increasing strend of some measuring point remains stable with Lower growth trend, and the deformation of rock mass is strending to be stable.
Analysis on characteristic parameters of deformation of rock around underground powerhouse based on chaos theory
In order to explore the rules of deformation of rock around underground powerhouse, the chaos theory is introduced and the chaos characteristic parameters are studied systematically and fully.Correlation dimension D is determined by improved G-P method,and maximum lyapunov exponent λ_1 is calculated by using the values of embedding dimension m and delay time τ computer from synthetic analyzing G-P method,C-C method and multiple autocorrelation method.Combining multi-points measuring displacement data of rock around Xiaowan underground powerhouse,the results show that multi-points measuring displacement data at crown apex and those at the measuring-point in 30m depth of arch aboutment do not have the chaos dynamic feature,but the others of arch abutment and those in wall have chaos feature,thus D0,m and τ are optimized,λ_10.So the study provides a new thought for the deformation rules of rock around underground powerhouse.
Did the metamorphosis from Export Processing Zones to Special Economic Zones improve the efficiency of trade enclaves in India?
In this paper, the efficiency of seven conventional Special Economic Zones in India is analyzed, by adopting a stochastic production frontier technique, for the period between 1986–1987 and 2007–2008.Results indicate that although the efficiency scores of these enclaves have improved over the years, specifically with the introduction of the SEZ policy (2000–2001), it is far below the threshold level as identified in the literature. Besides, one can also observe a discrepancy emerging between better export earning zones and efficient zones. On the determinants side, policy intervention and large geographical area, accompanied by clustering of units, are found to have impacted the efficiency scores of these enclaves positively.