We investigated the influence of riparian and whole watershed land use as a function of stream size on surface water chemistry and assessed regional variation in these relationships. Sixty-eight watersheds in four level III U.S. EPA ecoregions in eastern Kansas were selected as study sites. Riparian land cover and watershed land use were quantified for the entire watershed, and by Strahler orde...

Technical progress has simplified tasks in lab diagnosis and improved quality of test results. Errors occurring during the pre-analytical phase have more negative impact on the quality of test results than errors encountered during the total analytical process. Different infrastructures of sampling sites can highly influence the quality of samples and therewith of analytical results. Annually t...

The monitoring data of the 13 stations in Xi'an city for the whole years of 2013 and 2014 was counted and analyzed. Obtaining the spatial and temporal distribution characteristics of PM2.5 was the goal. Cluster analysis and the wavelet transform were utilized to discuss the regional distribution characteristics of PM2.5 concentration (ρ(PM2.5)) and the main features of its yearly changes and su...

The role of star-formation driven outflows in the obscuration of the central source in the Active Galactic Nuclei (AGN) is discussed. The outflow from a sub-parsec scale accretion disc is numerically modelled for parameters appropriate to the Galactic Centre. The resulting obscuration pattern is very patchy, with some lines of sight becoming optically thick to Thomson scattering. A fixed observ...

Total carbon dioxide (CO2) emission and energy consumption by mainland China in recent years has been second only to the U.S. China’s environmental pollution causes about 3.5% to 8% loss of GDP every year, indicating that its domestic environmental problem has become one of the most urgent issues the government must face. Current studies in the literature that employ data envelopment analysis (...

Introduction: Primary schools are children's first social environments. Other people's attitudes towards environmental hazards play a key role in developing children's personality. This study aimed to identify and assess the environmental risks (such as emission of pollutants into the air, discharge of pollutants into water and soil, energy consumption, etc.) in Shohadaye Kork female primary sc...

. Abstroct: Ceará shclf waters response to steady and transicnt wind forcing, from Ponta Cajuais (04°42'S, 37"19.5'W) to Ponta de ltapagé (02°50SS, 4QoOQ'W), was studied using a hydrodynamic numerical mode\. The finitc difference model was based upon the equations for a barotropic ocean in general form: advective and quadratic surface and bottom stress terms were included. Seasonal differences ...

BACKGROUND Poisson regression is routinely used in occupational and environmental epidemiology. For typical Poisson regression analyses, person-time and events are tabulated by categorising predictor variables that were originally measured on a continuous scale. In order to estimate a dose-response trend, a researcher must decide how to categorise exposures and how to assign scores to exposure ...