the soil erodibility factor varies spatially according to variations of some soil properties on the surface. this study was carried out to compare spatial variability of the soil erodibility factor as estimated and measured using the usle. the study was conducted in an agricultural zone with an area of in 900 km2 in hashtrood, northwestern iran. in the study area, 36 square grids with a dimensi...

[1] Arsenic concentrations measured by graphite furnace atomic absorption range from < 5 to 900 mg/L in groundwater pumped from 6000 wells within a 25 km area of Bangladesh. The proportion of wells that exceed the Bangladesh standard for drinking water of 50 mg/L arsenic increases with depth from 25% between 8 and 10 m to 75% between 15 and 30 m, then declines gradually to less than 10% at 90 m...

BACKGROUND Chagas disease is caused by the protozoan Trypanosoma cruzi, which is transmitted to mammal hosts by triatomine insect vectors. The goal of this study was to model the spatial distribution of triatomine species in an endemic area. METHODS Vector's locations were obtained with a rural householders' survey. This information was combined with environmental data obtained from remote se...

The land cover classes developed under the coordination of the International Geosphere-Biosphere Programme Data and Information System (IGBP-DIS) have been analyzed for a study area that includes the Conterminous United States and portions of Mexico and Canada. The 1-km resolution data have been analyzed to produce a gridded data set that includes within each 20-km grid cell: 1) the three most ...

Desertification is caused by the influence of the climatic, environmental changes and human activities. Its enlargement and reverse leads to not only the changes of spatial structure, scope and environment but also the development of society and economy. Chose TM remote sensing images which had two different temporal phases as data sources. Through data preprocessing and the choice of suitable ...

OBJECTIVES To examine the incidence and mortality of cancer near the Pan Britannica Industries factory, Waltham Abbey, after reports of a possible cluster of all cancers and brain cancer in the vicinity. METHOD Small area study of cancer incidence 1977-89, and mortality 1981-92, within a 7.5 km radius of the factory site. Postcoded cancer registrations and deaths in the study area were extrac...

Variations in a lake area constitute an important indicator of the modifications of the lake hydrology. This paper explores the inter-annual variations of the Poyang Lake area during the dry seasons occurringwithin the 1961 to 2010 period and further quantifies the severity of dryness recently endured during the 2000s. A physically based hydrodynamic model of Poyang Lake established the relatio...

Assimilation of mesoscale observations, such as AWS, GPSPW, etc., and initialization of the high resolution (3km or less) model with the 3DVar approach are still challenge problems. To improve the weather forecast over the Beijing area for the 2008 Olympic game, a 3 nests (27/9/3-km) WRFVar/WRF system with 3-h update cycle is established. The background error statistics (BES) files for each nes...

Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, USA e-mail: [email protected], Phone: (845) 365 8644, Fax: (845) 365 8154. Queens College, City University of New York, Flushing, New York 11367, USA Idaho National Environmental and Engineering Laboratory, Idaho Falls, ID 83404, USA Barnard College, New York, New York 10027, USA Department of Earth and...