In this paper, these model uncertainties are taken into account using a disturbance model with iterative learning which adaptively change the learning rate to treat gradual effect of the model mismatch differently from the drastic changes of external disturbance.
The model successfully predicts both the drastic viscosity reduction effects and the critical yield stress in the HMMPE+TLCP blends without any adjustable parameters.
The resulting vulnerability map was then integrated with a land use map as an additional parameter in the DRASTIC model to assess the potential risk of groundwater to pollution in the study area.
While the analysis of groundwater chemistry was not conclusive, it was encouraging to find that no well with high nitrate levels was found in the areas classified as being of low risk suggesting that the DRASTIC model for this area provided a conservative estimate of low risk areas.
The method adopted to calculate intrinsic vulnerability was the DRASTIC model, which hinges on a weighted addition of seven hydrogeologic features, but was combined with a pioneering approach for feature reduction and adjustment of feature weights to local settings, based on a multivariate statistical method.
The DRASTIC model assumes that the contaminant has the mobility of water.
Some scientists agreed that groundwater vulnerability assessment can be studied without considering all the factors of the DRASTIC model (Merchant 1994), while some others not agreed with the ideas (Napolitano and Fabbri 1996).
There are no alternatives to serious reforms of the political system and judiciary, separation of business and government, rationalization of the federal model, drastic reduction of bureaucracy, a genuine fight against corruption, and replacement of the old Soviet social security system.
The variable model can explain both the gradual (and/or asymptotic) and the drastic (and/or chaotic) compositional transitions.
The predictions generated by the static model are very unrealistic, and the difference between the dynamic models is drastic.
