A conjunctive query problem in relational database theory is a problem to determine whether or not a tuple belongs to the answer of a conjunctive query over a database. Here, a tuple and a conjunctive query are regarded as a ground atom and a nonrecursive function-free definite clause, respectively. While the conjunctive query problem is NP-complete in general, it becomes efficiently solvable i...

People often overestimate probabilities of conjunctive events. The authors explored whether the accuracy of conjunctive probability estimates can be improved by increased experience with relevant constituent events and by using memory aids. The first experiment showed that increased experience with constituent events increased the correlation between the estimated and the objective conjunctive ...

Recent approaches in the research on inconsistent databases have started analyzing the first-order reducibility of consistent query answering, i.e., the possibility of identifying classes of queries whose consistent answers can be obtained by a first-order (FOL) rewriting of the query, which in turn can be easily formulated in SQL and directly evaluated through any relational DBMS. So far, the ...

Abstract Irrigation water use and crop production may be severely limited by both shortages increased salinity levels. However, impacts of crop-specific limitations on irrigation scarcity are largely unknown. We develop a salinity-inclusive framework for the sector, accounting demands tolerance levels apply it to 29 sub-basins within two food bowl regions; Central Valley (California) Murray Dar...

The Biosphere Reserve (BR) model of UNESCO's Man and the Biosphere Programme reflects a shift towards more accountable conservation. Biosphere Reserves attempt to reconcile environmental protection with sustainable development; they explicitly acknowledge humans, and human interests in the conservation landscape while still maintaining the ecological values of existing protected areas. Conceptu...

Pesticides serve as indispensable inputs to ensure the optimal provision of agricultural commodities, thus exerting a significant influence on quality and yield food [...]

The availability of sufficient water resources is critical for sustainable social and economic development globally. However, recurrent drought has been a precursor to inadequate supply in the case Borkena Catchment, Awash River Basin, Ethiopia. To support conjunctive use management surface groundwater an integrated model was developed using SWAT–MODFLOW model. designed operate on monthly time ...