We describe a method for using spatially referenced regressions of contaminant transport on watershed attributes (SPARROW) in regional water-quality assessment. The method is designed to reduce the problems of data interpretation caused by sparse sampling, network bias, and basin heterogeneity. The regression equation relates measured transport rates in streams to spatially referenced descripto...

In many everyday situations, we bias our perception from the top down, based on a task or an agenda. Frequently, this entails shifting attention to a specific attribute of a particular object or scene. To explore the cost of shifting top-down attention to a different stimulus attribute, we adopt the task-set switching paradigm, in which switch trials are contrasted with repeat trials in mixed-t...

diversity in natural aspects for relaxation, entertainment as well as recreational opportunities associated with walking, sightseeing, camping near wells, qanats, and springs to spend leisure time and to enjoy landscapes, represents the recreational values which can be perceived due to surface water limitations. recreational value of water includes the benefits derived from those who leave wate...

stress waves contain useful information about the properties of porous materials; they can be recovered through different non-destructive testing methods such as crosswell, vertical seismic profile, borehole logging as well as sonic tests. in all these methods, it is crucial to assess the effects of frequency on wave attributes including velocity and intrinsic attenuation. the dependency of per...

In an active database, triggers are red in response to the occurrence of events. Events may have attributes, and the values of these attributes may be used as parameters to functions invoked in the action part. Composite events may be speciied as the composition of primitive events in the database system. The attributes of a composite event are derived from the attributes of its constituent pri...

In this paper a framework for deriving highlevel scene attributes from low-level image features is presented. Examples of attributes derived are photo-painting, indoor-outdoor, night-day and nature-city. The assignment of the attributes to images is done by a hierarchical classification of the low level features, which capture colour, texture and spatial information. A prototype for image class...