The construction industry consumes many natural resources and generates a large amount of waste in the environment, all phases life cycle. For this reason, use recycled material is increasingly being encouraged, instead original raw for production new materials that contribute to closing cycle.
 objective study was evaluate compare environmental impacts obtaining aggregate aggregate, takin...

This paper models uctuations in regional disaggregates as a nonstationary, dynamically evolving distribution. Doing so enables study of the dynamics of aggregate uctuations jointly with those of the rich cross-section of regional disaggregates. For the US, the leading state| regardless of which it happens to be|contains strong predictive power for aggregate uctuations. This e ect is di cult to ...

A framework for computing consistent answers to boolean aggregate queries in numerical databases violating a given set of aggregate constraints is introduced. Both aggregate constraints and queries are aggregation expressions consisting of linear inequalities on aggregate-sum functions. In particular, our approach works for a specific but expressive form of aggregation expressions (called stead...