نتایج جستجو برای: particles loadings
تعداد نتایج: 162762 فیلتر نتایج به سال:
..................................................................................................................... 13 CHAPTER 1 – INTRODUCTION ................................................................................... 15 Purpose of the Study ..................................................................................................... 17 Contributions of the Study ..............
BACKGROUND Nutrient loadings from its catchment upon The Fleet, a highly valuable coastal lagoon in Southern England, were hindcast for the period AD 1866-2004, using a catchment model, export coefficients, and historical data on land use changes, livestock numbers, and human population. Agriculture was the main nutrient source throughout, other inputs representing minor contributions. Permanen...
It is well known in the hydrometeorology literature that developing real-time daily streamflow forecasts in a given season significantly depends on the skill of daily precipitation forecasts over the watershed. Similarly, it is widely known that streamflow is the most important predictor in estimating nutrient loadings and the associated concentration. The intent of this study is to bridge thes...
Cow-calf operations are a source of excessive Nitrogen (N) and Phosphorus (P) loadings in the Lake Okeechobee basin, Florida (USA). A study was conducted at a beef-cattle ranch to evaluate ditch fencing and culvert crossing (DFCC) as a best management practice (BMP) implemented to improve downstream water quality. The BMP was implemented within a ditch section of 170 m in the ranch. The concent...
The uptake of Cu and Cd in aqueous solution by interaction with the surfaces of carefully synthesized finely sized particles of goethite, lepidocrocite, mackinawite, and pyrite was measured as a function of initial metal concentration in solution. The results show how reactions between metal ions in solution and mineral surfaces depend in a subtle way on the nature of the surfaces and, in certa...
Activate carbon impregnated with a mixture of copper oxide and zinc oxide performs well as active adsorber for NO2 removal in automotive cabin air filters. The oxide-loaded activated carbon exhibits superior long-term stability in comparison to pure activated carbon as has been shown in previous studies. The carbon material was loaded only with 2.5 wt% of each metal oxide. Characterization of t...
abstract the aim of this study is laboratory investigation of nitrate reduction in water using fe/cu nano particles. in this regards, nano fe0 (54±4 nm) and fe/cu particles (75±3 nm) was synthesized and characterized by x-ray diffraction pattern (xrd), scanning electron microscope (sem) and transmission electron microscopy (tem) photographs. the effects of coating load of nano-fe0 by cu (0, 5, ...
In this paper we report on the activity of Cuand Ni-containing cerium oxide catalysts for low-temperature water-gas shift (WGS). Bulk catalysts were prepared in nanocrystalline form by the urea co-precipitation–gelation method. Lanthanum dopant (10 at.%) was used as a structural stabilizer of ceria, while the content of Cu or Ni was in the range of 5–15 at.% (2–8 wt.%). At low metal loadings, C...
A laboratory intercomparison of organic carbon (OC) and elemental carbon (EC) measurements of atmospheric particulate matter samples collected on quartz filters was conducted among eight participants of the ACE-Asia field experiment The intercomparison took place in two stages: the first round of the intercomparison was conducted when filter samples collected during the ACE-Asia experiment were...
In this paper we propose a new knowledge model to understand the dynamic behavior of a Membrane-Electrodes Assembly (MEA) of a Polymer Electrolyte Fuel Cell. The model, multiscale and mechanistic, is based on irreversible thermodynamics and electrodynamics, and depends on the internal physical parameters such as the specific catalytic area, the electric permittivity of the materials, the reacti...
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