The source areas of headwater streams typically compose 60% to 80% of a catchment. This, plus the typical increase in precipitation with elevation, means that headwater streams generate most of the streamflow in downstream areas. Headwater streams also provide other important constituents to downstream reaches, including coarse and fine sediment, large woody debris, coarse and fine organic matt...

Much effort has been put into building data streams management systems for querying data streams. Here, data streams have been viewed as a flow of low-level data items, e.g., sensor readings or IP packet data. Stream query languages have mostly been SQL-based, with the STREAM and TelegraphCQ languages as examples. However, there has been little work on supporting OLAP-like queries that provide ...

ABSlRACT Over the years a variety of technologies have been used to remove organic contamination from water. Unfortunately, most of these techniques are either too expensive or too complicated to operate and, in some cases, cause secondary pollution effects. Various membrane processes have been developed and tried but, unfortunately, little success has been realized. Membrane processes are gain...

Casual observation suggests that Internet media firms sometimes allow consumers to pay to remove advertisements from a free advertisement-based product. In this paper I characterize when this business model is optimal and analyze its impact on advertising quantity and the distribution of surplus. The optimality of the business model depends on the relation between product quality, the annoyance...

Numerous studies of population genetics in salmonids and other anadromous fishes have revealed that population structure is generally organized into geographic hierarchies (isolation by distance), but significant structure can exist in proximate populations due to varying selective pressures (isolation by adaptation). In Chignik Lakes, Alaska, anadromous Dolly Varden char (Salvelinus malma) spa...

background: human hair can be used as an inexpensive and accessible adsorbent to remove a variety of pollutants from air. although several studies have been done on removal of formaldehyde from wastewater by human hair, to date no study has investigated using hair to remove formaldehyde from air. therefore, the aim of this study was to remove formaldehyde from synthetic contaminated air by a re...