The initial and basic role of the chase procedure was to test logical implication between sets ofdependencies in order to determine equivalence of database instances known to satisfy a givenset of dependencies and to determine query equivalence under database constrains. Recently thechase procedure has experienced a revival due to its application in data exchange. In this chapter<lb...

in semi arid area geomorphological impacts of dams are very major. dams, as man- made structures, have major impacts on river hydrology, primarly through in the timing, magnitude, and frequency of low and high flows, ultimately producing a hydrologic regime differing significantly from the pre-impoundment natural flow regime. despite the profiles of dams on river regulation for water resources ...

A peripherally inserted central catheter (PICC) line allows permanent vascular access and is widely used in pediatric oncology. In patients, who fully completed antitumor treatment, the PICC should be removed. some cases, however, procedure may complicated such a then called ‘hard-to-remove’ or ‘non-removable’. This article describes clinical case of successful non-surgical removal with develop...

water quality is a serious issue in tropical grasslands that must be addressed to ensure the continuity and sustainability of water resources. this study aimed to assess the stream water quality of tropical grassland under long-term moderate (2.7 animal unit ha-1 y-1 for 34 years) and short-term heavy (5 animal unit ha-1 y-1 for 2 years) grazing systems at catchment and farm scales in kuala lum...